The latest coal preparation plant safety regulations are

Coal Preparation Plant Safety Regulations

1 Scope

This standard specifies the production, operation and management of coal preparation plants (including screening plants) involving safety production regulations that should be followed.

This standard applies to all types of screening plants, coal preparation plants, and coal-water slurry plants.

2 Normative reference documents

The provisions in the following documents become provisions of this standard through reference in this standard. For dated referenced documents, all subsequent revisions (excluding corrigenda) or revised editions do not apply to this standard. However, parties to an agreement based on this standard are encouraged to investigate whether the latest versions of these documents can be used. For undated referenced documents, the latest edition applies to this standard.

Coal Law of the People's Republic of China

Production Safety Law of the People's Republic of China

Mining Safety Law of the People's Republic of China

Environmental Protection Law of the People's Republic of China

Atmospheric Pollution Prevention and Control Law of the People's Republic of China

Coal Mine Safety Regulations

3 Terms and Definitions

The following terms and definitions also apply to this standard.

3.1 Accident potential

The dangerous state of objects, unsafe behaviors of people and management defects that can lead to accidents.

3.2 Command against rules

The act of forcing employees to perform operations in violation of national laws, regulations, rules and regulations or operating procedures.

3.3 Operation against rules

The behavior of employees who do not abide by the rules and regulations and take risks to operate.

3.4 Occupational diseases

Diseases caused by employees being affected by occupational harmful factors, stipulated by the state in the form of regulations and diagnosed by state-designated medical institutions.

3.5 Protection measures

Isolation, shielding, safe distance, personal protection, etc. taken to prevent employees from accidentally entering a dangerous area or contacting harmful substances with certain parts of their body during work. measures or means.

3.6 Hazardous factors hagard

Factors that may cause personal injuries, occupational diseases, property losses, and damage to the working environment.

3.7 Moving screen jig ROMJIG

The jig screen plate supporting the bed of material to be processed can move up and down in the water.

3.8 Numerical control air valve

Also known as electronically controlled pneumatic air valve. Electronic numerical control devices and solenoid valves are used to control the jig air intake and exhaust air valves, and their frequency and characteristic curves can be adjusted arbitrarily.

3.9 Flotation column columned pneumatic flofation machine

Flotation equipment without stirring impeller, air enters from the bottom of the cylindrical body through the aerator and mixes with the coal slurry to form mineralized foam.

3.10 Flocculant

An agent added to a liquid with dispersed solids to aggregate fine particles to form flocs. It is suitable for various sewage purification treatments.

3.11 deep cone thickener

The height of the machine is greater than the diameter. The upper part is a cylinder and the lower part is an inverted cone-shaped clarification and concentration equipment with a smaller cone angle.

3.12 Closed water circuit for washing water circuit

After the coal slime water is fully concentrated and clarified, the coal slime is recycled in the factory and all the clarified water is recycled.

3.13 Tailings slurry pond

Also known as tailings pond. It is a structure for treating tail coal water.

3.14 Pressure filter

Put the filter into a special closed pressure vessel and fill it with compressed air to create a pressure difference on both sides of the filter medium to perform filtration. .

3.15 Coal water slurry coal water mixture CWM

A fluid fuel prepared by mixing coal, water and a small amount of additives with a certain particle size. Generally, add about 30-35% water and 1% additive.

3.16 dredging sump

Also known as Douzi dredging sump. It is a pool that constitutes one of the washing water circulation systems. The coal slime or coal dust deposited in it is continuously discharged using a dewatering bucket elevator. There is an overflow weir around or beside the pool, which can flow out clarified water.

3.17 Land reclamation

The process of covering the gangue layer or subsidence area with soil to create land. The gangue discharged from the coal preparation plant fills the collapse pit or is discharged into ditches and depressions, and then is covered with soil to achieve the purpose of planting.

3.18 numerical control system dispatching car

The locomotive driver, dispatcher and dispatcher in the dispatching room use walkie-talkies to direct the dispatching operation. It replaces the long-used light and flag signal shunting operations.

3.19 warning board

A sign that warns against moving vehicles colliding with vehicles parked on the station line.

3.20 dispatching winch

The coal preparation plant is used to dispatch vehicles under the coal pit and loading warehouse.

3.21 Under-voltage release protection device low voltage protection

Low voltage protection device is a relay protection device that can automatically cut off the power supply when the supply voltage drops to a specified limit value.

3.22 Dust

Solid material particles fine enough to be suspended in the air.

4 General Principles

4.1 In order to regulate the safe production of coal preparation plants, ensure the safety and health of employees, and prevent and reduce accidents, in accordance with the "Coal Law", "Safety Production Law", " Mine Safety Law" and "Environmental Protection Law" formulate these regulations.

4.2 Those engaged in coal preparation production and coal preparation plant construction activities must comply with these regulations.

4.3 Coal preparation plants must abide by national laws, regulations, rules and procedures related to production safety, as well as national standards, industry standards and technical specifications, have legal production safety conditions, and achieve safe production.

4.4 The coal preparation plant must establish and improve the safety production responsibility system of leaders at all levels, the safety production responsibility system of functional agencies, the safety production responsibility system of post personnel, as well as the safety production reward and punishment system and the safety production office meeting system. rules and regulations.

The director of the coal preparation plant is the first person responsible for safety production in the plant. The chief engineer (or technical person in charge) is technically responsible for the safety work of the factory. The heads of each functional department are responsible for safety work within the scope of their duties. Workshop directors and team leaders are directly responsible for safety work within their jurisdiction.

The director (manager) and mine director of the Mining Bureau (Group Company) must supervise the safety production work of the coal preparation plant, implement safety investment, and assume relevant responsibilities for the safety production of the coal preparation plant.

4.5 The coal preparation plant must set up a safety production management organization and be equipped with safety production personnel and equipment that meet work needs.

4.6 Coal preparation plants must implement safety target management and decompose indicators layer by layer. Safety production content must be included in economic contracting responsibilities and regularly inspected and assessed.

4.7 Coal preparation plants must organize frequent safety inspections, and problems discovered during the inspections should be dealt with immediately; if they cannot be handled, they should be reported to the relevant person in charge of the unit in a timely manner; the relevant person in charge should organize functional agencies to formulate safety regulations. Measures and rectification within a time limit.

4.8 While preparing the long-term development plan and annual production and construction plan for production and construction, the coal preparation plant must also prepare a safety technology development plan and a safety technology measure plan. The expenses required for safety technical measures must be included in the company's financial and supply plans and must not be used for other purposes.

4.9 The design of new construction, reconstruction, and expansion projects must comply with the provisions of this regulation. Designs that do not meet the requirements for production safety and labor protection shall not be approved; projects that do not meet the design requirements shall not be accepted and put into production.

4.10 Coal preparation plants must prepare annual flood prevention, fire prevention, lightning protection, explosion prevention, antifreeze and other disaster prevention and treatment plans, and organize their implementation.

4.11 The trade union organizes employees to participate in the democratic management and democratic supervision of the unit’s production safety work in accordance with the law, and safeguards the legitimate rights and interests of employees in production safety.

4.12 After an accident occurs in the coal preparation plant, the mine manager (mine-type coal preparation plant) and the director of the coal preparation plant must immediately take measures to organize rescue, and report the accident promptly and truthfully in accordance with relevant regulations.

5 Industrial factories and workplaces

5.1 Industrial factories

5.1.1 The roadways, sidewalks and rescue routes in the factory area should be smooth and smooth, and there should be enough traffic at night lighting. At road and track intersections, there must be clear and uniform traffic signs, signaling devices or drop bars.

5.1.2 The pits, wells, trenches and pools required for production must be equipped with fixed covers or fences. Warning signs must be installed in dangerous areas. A warning red light must be set up at night.

5.1.3 Buildings must be strong and safe. The factory building structure should be free from tilt, cracks, weathering, and collapse.

5.2 Workplace

5.2.1 Railings (height 105cm) must be added to lifts, large and small holes, stairs, platforms, and walking bridges. At entrances and exits, railings should be easily dismantled and can be restored in time after use. It is strictly prohibited to throw objects downward from high places.

The covers of wells, holes and ditches in the factory building must be flush with the ground. If it is necessary to drill holes in the floor slab for installation and maintenance, the construction must be reviewed and approved by the relevant technical department before construction. After the construction is completed, it should be restored to its original condition.

5.2.2 Cables and pipes shall not be located on floors where people frequently pass by. The height of chutes, pipes and cables suspended in the factory building shall not be less than 2m.

5.2.3 The width of the main passage in the factory building shall not be less than 1.5m, and the width of the secondary passage shall not be less than 0.7m. Wherever the machine is crossed, a bridge or walkway should be provided. Walking surfaces should be non-slip.

5.2.4 The light in the workplace should be sufficient, and the lighting parts should not be blocked. Lighting in aisles, corridors and work areas must comply with operational requirements.

5.2.5 During freezing periods, outdoor pipes should be bandaged. Dump trucks should be filled with antifreeze. Frozen working areas should be paved with anti-slip materials. Ice skating in high-rise buildings should be removed or screens should be installed in pedestrian walkways.

5.2.6 Reliable protective devices must be installed on the transmission parts of various equipment. The mesh opening of the mesh protective device shall not be larger than 50mm×50mm. The selection of various transmission conveyor belts must meet the technical requirements and be installed with appropriate tightness.

5.2.7 If the equipment fails during operation, it must be shut down for processing. When servicing equipment or entering the machine to clean debris, the power outage tagout system must be strictly implemented and dedicated supervision must be provided.

5.2.8 When cleaning the workplace, electrical equipment, cables, lighting, signal lines and equipment transmission parts must not be washed with water. Do not use water to cool down the bearing bush.

5.2.9 It is strictly prohibited for anyone to cross operating equipment, conveyor belts, wire ropes and chains. Pedestrians crossing railway lines should take safety lanes or safety bridges. When you need to cross the railway for work, you must "stop once, look twice, and pass three times." It is strictly prohibited to climb on the car, get under the car or pass between two cars.

5.2.10 Operators must wear labor protection equipment as required. Long hair should be tucked into a hat. It is prohibited to wear skirts, shorts, scarves, high heels, slippers and bare feet when working on site.

Safety helmets must be worn when inspecting equipment, hoisting, or entering the bottom of the equipment and inside the machine to clean debris, and when working in other low and narrow workplaces.

5.3 Fire protection, waterproofing, explosion-proof and lightning protection

5.3.1 Factory areas, production plants and warehouses must be equipped with necessary fire-fighting equipment and facilities. Drying, flotation, dry separation, raw coal preparation workshops and various coal bunkers, grease warehouses, oxygen warehouses, garages, locomotive garages, power distribution rooms, centralized control rooms and other key fire prevention areas must be equipped with a corresponding number of fire hydrants and water hoses. , fire extinguishers, sand boxes and other fire-fighting equipment, equipment and facilities. Firefighting equipment and equipment must be managed by dedicated personnel and inspected and replaced regularly.

Each unit shall set up a mass volunteer fire brigade or volunteer firefighters as needed.

5.3.2 Warehouses storing flammable and explosive items must meet safety, explosion-proof, and fire-proof requirements. It is prohibited to store flammable and explosive items in the workplace. A small amount of lubricating oil, daily grease, and oil guns must be stored in a dedicated isolation room.

5.3.3 In key fire prevention areas, open flames and smoking are prohibited. If electrical or gas welding is required for maintenance or other work, it must be approved by the fire protection department and necessary precautions must be taken before construction can begin.

5.3.4 Coal bunkers and raw coal preparation, dry selection, drying workshops and other places where coal dust is concentrated must comply with the following regulations:

a) Clean the floor and equipment regularly to prevent Coal dust builds up.

b) Electrical equipment must be explosion-proof or take explosion-proof measures.

c) Working with open flames (in special circumstances, relevant procedures must be completed) and smoking are prohibited.

d) The coal dust content in the air shall not exceed 10mg/m3.

5.3.5 Coal bunkers with large amounts of gas (raw coal bunkers, clean coal bunkers and buffer bunkers) and the rooms and corridors connected to them must comply with the following regulations:

a) Establish Three-shift patrol inspection system and formulation of inspection charts.

b) The coal bunker is equipped with a gas outlet higher than the roof.

c) Use electromechanical equipment and lighting that meet explosion-proof requirements.

d) When the gas concentration in the coal bunker reaches 1.5, the nearby electrical equipment within 20m will stop operating immediately.

e) When the gas concentration in rooms and corridors reaches 0.5, immediately cut off all non-intrinsically safe power supplies (including lighting power supplies).

5.3.6 It is strictly prohibited for anyone to bring flammable or explosive materials into the workshop or mix them with coal. Once detonators and explosives are found mixed in coal, they must be carefully removed immediately and sent to the relevant departments for processing.

5.3.7 Underground pump rooms, underground corridors and underground buildings must be equipped with collection tanks and install corresponding drainage pumps. The drainage capacity of the drainage pump must exceed 20% of the maximum water inflow during the rainy season.

5.3.8 Drainage ditches should be excavated around underground coal bunkers and other buildings and kept clear.

5.3.9 Lightning protection devices must be installed in high-rise buildings in coal preparation plants and other buildings and facilities that need to be protected from lightning strikes. Lightning protection devices must be inspected and measured regularly.

5.3.10 The tanks, gate valves and underground pipelines of the flotation reagent storehouse should be inspected frequently.

6 Unloading and Storing Coal

6.1 Unloading Coal

6.1.1 The coal pit must be covered with a solid grate, and its holes must not be larger than 300mm×300mm. When unloading coal, the grate is not allowed to be removed. Sound and light signals must be set up at the workplace where coal pits are exposed.

6.1.2 When a coal truck is unloading coal, persons unfamiliar with the operation are not allowed to open or close the door; before opening or closing the door, relevant personnel on and off the coal truck must be notified.

6.1.3 Coal unloaders must get on and off the coal car by pedaling the car and are not allowed to jump off the car. It is prohibited for coal unloaders and coal unloaders to work in the same vehicle at the same time.

6.1.4 When large pieces of gangue, ironware, or pit wood are found in the vehicle, the coal unloader shall cooperate with the coal unloading driver to handle them together and shall not unload them into the warehouse. When handling large pieces of gangue and other objects or throwing tools to both sides of the track, a warning must be given to the people under the vehicle before the operation, and the operation can only be carried out after there is no one under the vehicle.

6.1.5 When the coal unloader is working, no one is allowed to stand on the coal pit. Coal unloader drivers are not allowed to stick their heads or bodies outside the control room when working. The control room door must be equipped with a locking protection device.

6.1.6 When the coal unloader auger is inspected, it must be tied securely or lowered to the ground. When the auger needs to be lowered, it must be contacted in advance by the station dispatching office and can only be operated after approval.

6.1.7 When using a dumper to unload coal, the following regulations should be observed:

a) The coal truck model meets the requirements of the dumper.

b) When the dumper is in operation, unrelated personnel are not allowed to approach the operating area; when the dumper is emptying, a signal is sent to the winch driver.

c) When cleaning under the car, cut off the power supply first and take reliable safety measures.

d) Shunting personnel are not allowed to enter the dumper room in vehicles.

6.1.8 When using a winch to unload coal, the following regulations should be observed:

a) When the winch starts pulling coal trucks, first pull the wind and pull the specified number of trucks.

b) When the coal unloader is running, the unloader and other personnel should leave the danger area.

c) After unloading the vehicle, clear the road promptly.

6.2 Coal Storage

6.2.1 The inspection hole of the coal bunker must be covered with a cover plate, and the feed inlet must be equipped with a solid grate protection. The grate mesh should not be larger than 200mm×200mm. . Unless under special circumstances, the grating protection is not allowed to be removed.

6.2.2 Coal bunkers with fine-grained raw coal and easy arching should be equipped with wind or mechanical arch breaking and clearing facilities.

6.2.3 When performing manual clearance, the following regulations must be observed:

a) Reliable safety measures must be formulated and approved by the security department, and organized to be studied by the clearance personnel and signed by themselves.

b) The gas concentration in the coal bunker shall not exceed 1.5.

c) The warehouse cleaning personnel are in good health. Persons suffering from high blood pressure, deaf-mute disease, heart and liver disease, epilepsy, profound myopia and other diseases, and other persons who are not suitable for warehouse clearance, are not allowed to enter the warehouse to clean or engage in warehouse supervision.

d) Cleaning personnel entering the warehouse should wear safety helmets and safety belts. The safety belt rope is fixed on a reliable fixture outside the warehouse, and the safety belt rope is held by the supervisor.

e) When entering and cleaning the warehouse, a dedicated person will be assigned to supervise it. Generally, the number of guardians shall not be less than 2; the warehouse shall have good lighting and reliable safety measures.

f) The monitoring personnel can see the actions of the staff and listen to the shouts of the personnel in the warehouse. The cleaning personnel entering the warehouse communicate with the monitoring personnel outside the warehouse every 30 minutes.

g) If there is coal accumulation on a steep slope of 60° to 70° on the warehouse wall, remove the coal accumulation on the steep slope before entering the warehouse.

h) When cleaning the coal bunker, the conveyor above the bunker and the coal feeder below the bunker will stop operating and lose power.

When coal needs to be unloaded during the warehouse clearing process, the warehouse clearing personnel must evacuate the operation site or stand in a safe place. The warehouse clearing can only continue after the bulk coal in the warehouse is unloaded and the coal feeder under the warehouse stops operating. Blasting to clear warehouses or break arches is prohibited.

i) The clearance personnel work in shifts; after the clearance is completed, the person in charge of the clearance will count the personnel and tools. After everything is correct, the warehouse will be closed.

6.2.4 The following regulations should be followed when dropping coal:

a) Before dropping coal, carefully observe whether there are people or vehicles at the coal dropping point, and confirm that there are no people or vehicles before dropping coal. .

b) When coal is falling, persons or vehicles are prohibited from staying or walking near the coal falling point.

c) When coal is not falling, close the bin mouth or chute mouth of the coal falling point.

6.2.5 When storing and transporting coal in the coal storage yard, coal walls with large height differences must not be formed. When coal is dropped, it is not allowed to push the coal at the coal drop point. When it is really necessary to push coal at the coal dropping point due to work, the coal dropping point should be stopped or the coal dropping point should be changed to another location.

6.2.6 When there is a large amount of coal stored in the coal storage yard, there must be a safe passage on the coal pile for bulldozers to enter and exit the coal yard. The road slope should be less than 25° and the width should be more than 5m.

6.3 Coal feeding

6.3.1 When the coal bunker is blocked, staff should use special tools to poke the coal. When poking coal, you should stand on the platform; you are not allowed to stand on railings, motors or equipment. It is not allowed to poke coal at the entrance of the warehouse. It is not allowed to hold the tool against your body or push it with your hands.

6.3.2 When the coal feeder is blocked by materials during operation, it must not be cleared directly by hand.

6.3.3 The pins and screws of each rotating part of the coal feeder must be firm. When using the impeller coal feeder, if it is found that the wire rope is wrapped around the main shaft or large pieces of gangue, iron or wood are stuck in the wheel, it must be stopped urgently.

7 Screening, crushing and grinding

7.1 Screening

7.1.1 Screening machines (including dewatering screens) should be started without load. The screening machine is not allowed to operate overloaded. The transmission device of the screening machine must be equipped with a protective cover.

7.1.2 When the screening machine is running, workers are not allowed to jump onto the screen plate to wedge, tighten the screen plate screws or rub the vibrator. To clean the screen holes and deal with accidents, the vehicle must be stopped.

7.2 Crushing

7.2.1 The crusher must work in a closed state. The rotating parts of the crusher must be equipped with protective covers. It is not allowed to open the crusher case cover during operation. Operators are not allowed to stand on the crusher.

7.2.2 The safety pin of the crusher shall not be replaced by other metal pins. The liquid-linked fusible plug must not be replaced or used at will.

7.2.3 Before crushing large pieces of coal, an iron remover and hand selection must be used to prevent unbreakable objects such as metal and wood from entering the crusher.

7.2.4 When cleaning the debris in the crusher or performing maintenance, the power must be cut off and at least 2 people must be present, 1 person to clean and 1 person to monitor.

7.3 Grinding

7.3.1 Safety guardrails must be installed on both sides of the drum of the grinder. When the grinder is running, the operator is not allowed to work under the transmission device and the roller, and is not allowed to add steel balls into the body from the feed end.

7.3.2 The materials fed into the ball mill must be free of impurities.

7.3.3 When cleaning the grinder, the power outage tagging system must be strictly implemented and a dedicated person must be assigned to monitor it.

8 Coal sorting

8.1 Hand selection

8.1.1 Protective plates must be installed on both sides of the hand selection conveyor belt. There should be at least two people working at the hand-selected work point and supervising each other. Manual workers are not allowed to squat or sit on the guard plates on both sides of the belt conveyor to work.

8.1.2 The belt speed of the belt conveyor shall not exceed 0.3m/s, and the inclination angle shall not exceed 12°. When the width of the conveyor belt exceeds 0.8m, manual selection stations should be set up on both sides.

Belt conveyors must be equipped with emergency stop buttons.

8.1.3 It is strictly prohibited to walk, cross, sit or lie on the manual conveyor belt. Operators are not allowed to stand or work within 1.2m below the screen opening of the raw coal classification screen and at the mouth of the unloading chute.

8.1.4 Operations in the waste bin can only be carried out after safety measures have been formulated and approved.

8.1.5 When staff find detonators, explosives, metal, wood, extra large pieces of gangue and other items, they should carefully select them promptly and shut down the machine for processing if necessary. The selected detonators and explosives may not be kept, transferred or destroyed without permission.

8.2 Jig coal preparation

8.2.1 During the operation of the jig, workers are not allowed to test the air volume at the exhaust port of the air valve or lubricate the sliding body directly with their hands.

8.2.2 For jigs using pneumatic air valves, the high-pressure air pressure shall not be higher than 0.6MPa, and the air valve system shall not operate when the lubricator is short of oil.

8.2.3 When electric welding is required to repair the inside of the air box, the oil inside the air box must be cleaned and good ventilation must be maintained.

8.2.4 Scaffolding must be erected when inspecting and dealing with water leakage in the trapezoidal chute and flange at the lower part of the jig body. Operators must wear seat belts.

8.2.5 When the wind pressure of the pneumatic discharge system exceeds 1.5MPa, the safety valve should be able to automatically release air.

8.2.6 When cleaning the jig body, the bed screen plate must be cleaned first. Personnel who enter the machine body for cleaning must wear seat belts and be supervised by dedicated personnel.

8.2.7 When the diaphragm jig is in operation, the stroke must not be adjusted arbitrarily. When adjusting the stroke, a power outage sign should be hung on the equipment start button, and at least two people should be present, one to supervise and one to adjust the stroke. Operators are not allowed to pull the transmission triangle belt by hand.

8.2.8 When entering the moving screen jig operation, the power outage tagout system must be implemented.

8.3 Dense medium coal preparation

8.3.1 The heavy medium separator and the feeding, product removal and medium systems must implement closed operation.

8.3.2 It is prohibited to enter the inclined wheel separator with iron or large pieces of waste exceeding the specified limit. It is prohibited to use wooden sticks to press the waste wheel transmission belt to force it to run.

8.3.3 When using a cyclone for sorting, the feed particle size should be strictly controlled. Metal objects and debris are prohibited from entering the cyclone.

8.3.4 When inspecting and cleaning the magnetic separator, sorting tank or lifting wheel, a power outage tagout system must be implemented, a dedicated person shall be assigned to monitor it, and effective safety measures must be formulated.

8.3.5 It is strictly forbidden for magnetic powder to enter the inside of the motor. A certain distance should be maintained between the storage location of magnetic media powder and the motor; if the distance is difficult to ensure, a motor with a protection level of IP44 or above should be selected.

8.3.6 A grate must be installed on the media barrel, and the aperture of the grate shall not be larger than 10mm. Operators must wear seat belts when cleaning debris on the grate.

8.4 Flotation Coal Preparation

8.4.1 When cleaning the flotation machine, flotation column, mixing barrel and slurry preparation device, the coal slime should be emptied and the power should be hung on the operation cabinet. Card. Operators must wear seat belts and be supervised when entering the machine to work.

8.4.2 The dosing point of the flotation machine must be arranged in a safe location, and anti-slip and fire prevention measures must be taken. Flotation chemicals that are harmful to workers' health must not be used.

8.4.3 Before starting the flotation machine, flotation column, and mixing tank, the staff must inspect each unit one by one to check whether there are other maintenance personnel in the machine and whether there are obstacles in the rotating parts. Can be started.

8.5 Dry coal preparation

8.5.1 Dry coal preparation equipment must operate in a closed state. During the sorting process, it is prohibited to open the lid of the box. Dust-raising points must be sealed and equipped with dust removal facilities. The dust concentration in the workplace should meet the prescribed requirements.

8.5.2 When cleaning the dry selection machine surface (screen holes are clogged), cyclone dust collector and ventilation pipes, a power outage tagout system must be implemented. Cleanup crews must wear hard hats.

8.5.3 Staff members are strictly prohibited from bringing any kind of fire into the factory and smoking in the factory. When conducting welding operations in the factory, production must be stopped.

8.6 Shaking table coal preparation

8.6.1 The motor power cord on the excitation box should be equipped with a wear-resistant, safe and reliable insulating sleeve.

8.6.2 If the equipment fails, it should be stopped immediately for processing. Operators are prohibited from standing on the bed or excitation box to handle faults.

9 Dehydration and drying

9.1 Centrifugal dehydrator

9.1.1 The centrifugal dehydrator must not be overloaded. The feed materials must not be mixed with soft or hard debris and large particles.

9.1.2 The oil pump motor, vibration motor and rotary motor of the centrifugal dehydrator must be locked.

9.1.3 When the equipment is in operation, staff are not allowed to climb on the centrifuge to work.

9.1.4 The fixing bolts of the decanter centrifuge must be tightened to prevent the vibration isolation spring from breaking and deforming.

9.1.5 The decanter centrifuge must be equipped with safety protection devices and sensors.

9.1.6 The opening indicators of the main shut-off valve, feed valve and flushing valve of the decanter centrifuge should be accurate.

9.2 Filter

9.2.1 Protective railings must be installed around the operation and inspection platform of the filter and buffer funnel. When repairing or replacing the filter cloth, a safety frame must be set up.

9.2.2 Impacting, welding and opening holes on the wall of the pressure vessel of the pressurized filter are prohibited.

9.2.3 The pressurized filter chamber and back-flush air bag must formulate an annual inspection plan in accordance with the regulations on pressure vessels, and report it to the local safety supervision agency and inspection unit. If the inspection unit passes the inspection and It can only be used after obtaining the use license.

9.2.4 Mechanical and electrical locking devices must be installed on the entrance doors of the pressurized chamber and backflush air bag of the pressurized filter. It is necessary to stop the machine and enter the pressurized chamber and backflush air bag of the pressurized filter for inspection, and the air pressure inside and outside must be ensured to be equal.

9.3 Filter Press

9.3.1 When the box filter press (referred to as the filter press) is working normally, the operator is not allowed to put his feet, hands, or head into the filter press. Observe the belt conveyor or the middle trough below between the filter plates or from between the opened filter plate gaps. It is prohibited to place tools on the hook frame or the handle of the filter plate. When removing the filter cake, operators are not allowed to remove the filter cloth and slime with their hands.

9.3.2 Operators are prohibited from wearing gloves to operate the switch of the filter press. Do not press the switch when there are people on the rack, machine roof or beam. To replace the filter cloth and clean the slime in the feed hole in the center of the filter plate, the transmission hook must be leveled.

9.3.3 The hydraulic part of the filter press must be equipped with an electric contact pressure gauge.

9.3.4 It is forbidden for debris to enter the belt filter press. Once found, it must be shut down immediately. Operators are strictly prohibited from walking on the belt filter press belt.

9.3.5 The flocculant addition system matched with the belt filter press should take anti-slip measures. When feeding stops, the mesh belt and the surrounding area of ??the equipment should be rinsed clean.

9.4 Fire drying

9.4.1 Before starting the drying workshop, a comprehensive and systematic test inspection must be carried out. Before stopping the dryer, all coal stored in the drum must be discharged.

9.4.2 Operators should frequently check the returned coal in the dryer feed box. When discharging ash, there must be good ventilation in the room, and the carbon monoxide content in the ash discharging chamber and dust collector shall not exceed 0.00015g/m3. When cleaning the furnace and discharging ashes, the ashes should be extinguished with water before being discharged. It is prohibited to transport them out with fire. When pulverized coal burns in the multi-tube dust collector, the induced draft fan must be stopped immediately and the inspection hole must be opened to extinguish the fire.

The explosion-proof valve must be inspected once every shift and replaced immediately if it is found to be malfunctioning.

9.4.3 The temperature and pressure at each point of the dryer are not allowed to exceed the requirements in Table 1.

Table 1 Maximum allowable values ??of temperature and pressure at each point of the thermal dryer

Items

Drying

Machine model furnace dryer Inlet Dryer outlet Induced draft fan

Temperature/

℃ Pressure/

mmH2O Temperature/

℃ Pressure/

mmH2O temperature/

℃ pressure/

mmH2O temperature/

℃ pressure/

mmH2O

Tubular type

Liquid cylinder type

Sprinkling type

Boiling type 850

1200

800

1200 -5

-2

-5

385～450 800

800

500

495 -100

-15

-15

-25～25 150

200

150

73 -190

-50

-100

-255～-150 120

120

120

73 -300

-150

-200

130～170

Note: 1 mmH2O=9.80665Pa

9.4.4 The control system of the dryer must be equipped with an alarm instrument that can send out audible and visual signals at the same time. Various instruments should be calibrated regularly to ensure they are in good condition.

9.4.5 The drying workshop must be equipped with an effective dust removal system. Equipment and transfer points that generate coal dust must be sealed. When the equipment is running, the dust concentration in the workshop shall not exceed 10 mmH2O g/m3.

9.4.6 The dust collector or discharge dust collector directly connected to the dryer must be constructed of refractory materials.

9.4.7 Dry dust collectors must be equipped with explosion pressure relief holes. The thickness of the galvanized sheet covered by the explosion-proof pressure relief hole of the multi-tube dust collector shall not exceed 0.5mm.

9.4.8 The building of the drying workshop must be equipped with an explosion pressure relief hole that leads directly to the outdoors. Pressure relief holes should be able to expand, penetrate or break quickly.

9.4.9 After the dryer is in normal operation, hot furnace air is available for operation.

9.4.10 When electric or gas welding is required in the drying workshop, reliable safety measures must be formulated, which can only be carried out after approval by the workshop director and the director in charge, and under on-site supervision by safety supervisors.

9.4.11 Dryer operators must wear protective glasses and other high-temperature protective equipment when operating. Stoker workers are prohibited from wearing chemical fiber clothing for work.

9.4.12 If you need to enter the dryer for inspection or maintenance, you must first stop the furnace to cool down, drain the coal in the dryer, remove dust and ventilate it before proceeding.