How much is the investment in the ash water treatment system section (made in China) of 300,000 tons of coal gasification synthetic ammonia?

Gasification processes have their own advantages and disadvantages.

1. Atmospheric fixed bed intermittent anthracite (or coke) gasification technology

At present, one of the coal gasification technologies mainly used in nitrogen fertilizer industry in China is characterized by intermittent gas production with atmospheric fixed bed air and steam, and the raw materials are required to be? Quasi-25 ~ 75 mm lump coal anthracite or coke is a process that will be eliminated because of its low utilization rate of raw materials, high unit consumption, complicated operation, low gas output in a single furnace and serious air pollution caused by blast venting.

2. Oxygen-enriched continuous gasification technology of anthracite (or coke) in atmospheric fixed bed.

It is characterized by using oxygen-rich gas as gasifying agent, continuous gasification and easy acquisition of raw materials. The anthracite or coke with quasi-8 ~ 10 mm particle size improves the utilization rate of raw materials, and has no pollution to the atmosphere, less maintenance workload and low maintenance cost. Suitable for places with anthracite, the existing atmospheric fixed bed intermittent gasification technology was improved.

3. Lurgi fixed bed coal pressurized gasification technology

It is mainly used to gasify lignite and unbonded or weakly bonded coal, which requires high thermal stability, good chemical activity, high ash melting point, high mechanical strength and unbonded or weakly bonded, and is suitable for producing city gas and gas. The contents of tar, hydrocarbon and methane in coal gas are about 1% and 10% respectively. Tar separation and phenol-containing sewage treatment are complicated, so it is not recommended to produce synthesis gas.

4. Ash fusion coal gasification technology

Technology of Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences. It is characterized by wide adaptability of coal species and belongs to fluidized bed gasifier. Coal ash does not melt, but only melts into spherical or massive ash and is discharged. It can gasify lignite, bituminous coal with low chemical activity, anthracite and petroleum coke with less investment and low production cost. The disadvantage is that the operating pressure is low, and the problems of environmental pollution, storage and comprehensive utilization of fly ash need to be further solved. This technology is suitable for small and medium-sized nitrogen fertilizer plants to change the raw material route by using local or nearby coal resources.

5. Ende pulverized coal gasification technology

It belongs to an improved Winkler fluidized bed coal gasifier, which is suitable for gasifying lignite and long flame coal. Raw coal is required to be non-caking or weakly caking, with ash content less than 25% ~ 30%, high ash melting point and good low-temperature chemical activity. There are 22 gasifiers 13 built and under construction in China, and they have been put into production 16. It belongs to a fluidized bed gasifier, and the temperature in the middle of the bed is 1000 ~ 1050℃. At present, the maximum gas output of gasifier is 40000 m3/h semi-water gas. The disadvantages are that the gasification pressure is normal pressure, the gasification capacity of a single furnace is low, the CH4 content in the product gas is as high as 1.5% ~ 2.0%, the amount of fly ash is large, and the problems of environmental pollution, storage and comprehensive utilization of fly ash need to be solved. This technology is suitable for small and medium-sized nitrogen fertilizer plants with lignite nearby to change the raw material route.

6.GE coal water slurry pressurized gasification technology

It belongs to entrained-flow pressurized gasification technology. The system of conveying, pulping and pumping raw coal into the furnace is simpler, safer, more reliable and cheaper than dry pulverized coal pressurized gasification. The production capacity of a single gasifier is large. At present, the coal quantity of the world's largest gasifier is 2000t/d, and the maximum production capacity of the gasifier that has been put into operation in China is1000 t/d. The designed gasifier has a maximum production capacity of 1600 t/d, which is widely applicable to raw coal, such as gas coal, bituminous coal, sub-bituminous coal, anthracite coal, high-sulfur coal and low-ash melting point inferior coal. However, it is required that the ash content of raw coal is low, the melting point of ash is lower than 1300℃ in reducing atmosphere, and the viscosity-temperature characteristics of ash are good. The gasification system does not need external supply of superheated steam and N2 or CO2 to transport raw coal for gasification. The total thermal efficiency of gasification system is as high as 94% ~ 96%, which is higher than that of Shell dry coal gasification (9 1% ~ 93%) and GSP dry coal gasification (88% ~ 92%). The gasifier is simple in structure, lined with refractory bricks, convenient to manufacture and low in cost. Gas dust removal is simple, expensive high-temperature and high-pressure fly ash filter is not needed, and investment is saved. Six 15 gasifiers have been built and put into operation abroad; Seven 2 1 gasifiers have been built and put into operation in China, and four 2 13 gasifiers are under construction and design. The final products of the completed plant include synthetic ammonia, methanol, acetic acid, acetic anhydride, hydrogen, carbon monoxide, fuel gas and combined cycle power generation. After being completed and put into operation, each device has been running continuously and stably for a long time. The localization rate of equipment is over 90%. Due to the high localization rate and lower equipment investment than other pressurized gasification devices, the construction cost ratio of pressurized gasification of coal water slurry with standby gasifier to pressurized gasification of dry pulverized coal without equipment is roughly as follows: Shell method: GSP method: pressurized gasification of multi-nozzle coal water slurry: GE coal water slurry method = (2.0 ~ 2.5): (1.4 ~ 65438+. The disadvantage is that the raw coal for gasification is limited by the refractory lining of the gasifier and is suitable for gasification of low ash melting point coal; Low carbon conversion rate; Specific oxygen consumption and specific coal consumption are higher; The service life of refractory bricks in gasifier is short, generally 1 ~ 2 years; The service life of gasifier burner is short.

7. Multi-component slurry pressurized gasification technology

The coal gasification technology with independent intellectual property rights developed by Northwest Research Institute of Chemical Industry belongs to the downstream gas production of airflow vane burner. A typical multicomponent slurry consists of 60% ~ 65% coal, 65% oil and 20% ~ 30% water. The author thinks that the oil blending method in the preparation of multi-component slurry does not conform to the current policy of changing the raw material route with coal instead of oil in China's nitrogen fertilizer industry and needs to be improved.

8. Coal water slurry multi-nozzle (four burners) pressurized gasification technology

It is jointly developed by East China University of Science and Technology, Yankuang Lunan Fertilizer Plant and China Tianchen Chemical Company. It belongs to the downward gas production of multi-burner in entrained flow bed, and the gasifier is lined with refractory bricks. The 1 gasifier system with gasification pressure of 6.5MPa and coal conveying capacity of 750t/d was built in Lu Hua Hengsheng Chemical Co., Ltd., Dezhou, Shandong Province. It was officially put into operation in June 2005 and has been running well so far. Shandong Tengzhou yankuang Guotai Chemical Co., Ltd. has built two sets of gasifier systems with gasification pressure of 4.0MPa and coal conveying capacity of1150t/d. It was successfully put into operation on July 2, 20051and has been running ever since.

9. Shell dry pulverized coal pressurized gasification technology

Belonging to entrained-flow pressurized gasification technology. Can gasify lignite, bituminous coal, anthracite, petroleum coke and high ash melting point coal. Raw coal into the furnace is dry pulverized coal after drying and grinding. Dry pulverized coal enters from the lower part of the gasifier, which belongs to multi-burner upward gas production. At present, the largest foreign gasifier has a handling capacity of 2000t/d coal, and the gasification pressure is 3.0MPa. The gasifier adopts water-cooled wall without refractory lining. Coal with high ash melting point can be gasified, but limestone is still needed as flux in raw coal. Since 2000, China has introduced 19 unit, and its target products are synthetic ammonia and methanol, and the gasification pressure is 3.0 ~ 4.0 MPa. Shell coal gasification plant imported from China is only equipped with 1 gasifier for single series production, and there is no spare boiler. Whether it can run continuously and stably all the year round in coal chemical production remains to be tested. 1 boiler-free equipment investment is equivalent to 2 ~ 2.5 times of the investment of GE gasification unit or multi-nozzle coal water slurry gasification unit with equipment boiler. After the high-temperature gas discharged from the gasifier is recovered by a huge and high-investment waste heat recovery boiler, if it is used in coal chemical industry, it still needs to return to the subsequent CO shift system. If it is used to make synthetic ammonia and hydrogen, the amount of by-product steam is not enough. At the same time, it is necessary to set up another medium-pressure superheated steam system for superheated steam in gasifier. The author thinks that the pressurized gasification technology of dry pulverized coal in shell waste heat boiler is not suitable for coal chemical production and needs to be improved.

10.GSP dry pulverized coal pressurized gasification technology

Belonging to entrained-flow pressurized gasification technology. The raw coal entering the furnace is dry pulverized coal after drying and grinding, and the dry pulverized coal enters from the top of the gasifier, which belongs to single burner downward gasification. There are internal components of water wall in the gasifier. At present, the coal quantity of the largest GSP gasifier abroad is 720t/d lignite. Because of the water cooling process, the investment is less than that of Shell furnace, which is suitable for coal chemical production. Under normal circumstances, liquefied gas or other combustible gases should be burned to facilitate ignition, prevent flameout and ensure safe production. At present, there are three GSP gasification technologies in the world, but none of them are used for coal gasification. Among them, the black water pump coal gasification device has only achieved six years in gasifying lignite, but has no long-term achievements in gasifying high ash and high ash melting point coal. Shenhua Ningxia Coal Industry Group Co., Ltd. has decided to adopt GSP dry pulverized coal pressurized gasification technology to build 830,000 tons/year dimethyl ether and 600,000 tons/year methanol projects in the first phase, with a coal capacity of about 2,000 tons/day per furnace.

1 1. Two-stage dry pulverized coal pressurized gasification technology

Xi 'an Thermal Engineering Research Institute has successfully developed coal gasification technology with independent intellectual property rights. The coal that can be gasified includes lignite, bituminous coal, lean coal, anthracite, coal with high ash content and high ash melting point, and does not produce tar and phenol. It is characterized by two-stage gasification, but the disadvantage is that the content of CH4 in synthesis gas is high, which is not conducive to the production of synthetic ammonia, methanol and hydrogen. The invention is suitable for combined cycle power generation. Its demonstration device-two-stage dry pulverized coal pressurized gasifier (waste heat boiler process) with a coal throughput of 2000t/d has been decided to be used in Huaneng Group's "Green Coal Electricity" project, and another demonstration device-two-stage dry pulverized coal pressurized gasifier (chilling process) with a coal throughput of 1000t/d has been decided to be used in Inner Mongolia Shilin Chemical Co., Ltd.' s 300,000 t/a methanol project.

12. Four-nozzle opposed dry pulverized coal pressurized gasification technology

East China University of Science and Technology, Yankuang Lunan Fertilizer Plant (National Engineering Research Center for Coal Water Slurry Gasification and Coal Chemical Industry) and China Tianchen Chemical Company developed a coal gasification technology with independent intellectual property rights. The coal conveying capacity of the pilot plant is 15 ~ 45t/d, and it is built in Yankuang Lunan Chemical Fertilizer Plant. The gasifier is a hot fireplace lined with refractory bricks. Dry pulverized coal is added from the upper part of the gasifier through four burners, and the generated synthesis gas is cooled with water and discharged from the gasifier. Belonging to an entrained-flow coal gasifier. The experiment takes the coal used in the GE coal-water slurry gasification industrial device produced by Yankuang Lunan Chemical Fertilizer Plant as raw material. In the pilot plant, nitrogen and CO2 are used as carrier gas. The gasification temperature is 1300 ~ 1400℃ and the gasification pressure is 2.0 ~ 3.0 MPa.