Exploration of green industrial building practice?

Since the Thirteenth Five-Year Plan, under the guidance of the concept of green development, China's green-related industries have entered a period of rapid development. Green buildings have shown an exponential growth trend in recent years, and the emergence of a large number of green buildings has prompted the design, consultation and construction of green buildings to become standardized. Taking the Tianjin factory project of FAW-Volkswagen Automobile Co., Ltd. (hereinafter referred to as FAW-Volkswagen Tianjin factory) as an example, this paper analyzes how to integrate the green concept into the whole life cycle of industrial buildings.

I. Overview of the Project

After the completion of FAW-Volkswagen Tianjin factory project, the annual output of passenger cars is 300,000. It is located in TEDA Ninghe Industrial Park, Tianjin Development Zone. The main facilities are: stamping workshop, welding workshop, painting workshop, assembly workshop and raw material warehouse, finished car parking lot, test track, workshop living room (canteen, rest room) and technology center. Production units include stamping, welding, painting and assembly. The total land area of this project is 108 1000 square meters, and the total construction area is 1039400 square meters. The stamping workshop, welding workshop, painting workshop and final assembly workshop adopt steel structure workshop, and the joint station building and sewage treatment station adopt frame structure. Implement the "three simultaneities" policy of factory construction, strengthen safety, environmental protection and energy-saving measures, improve safety in production, save energy and reduce consumption, prevent pollution, and meet the requirements of national and local laws and regulations.

Second, the application of green technology in the planning stage.

Based on the green practice of several automobile factories in the previous period, the construction unit used this project to construct the standardization process of green industrial buildings in enterprises. In the project planning stage, the star target, total investment increment and technical route of green industrial buildings are defined, and the application of green technology is mainly considered in site selection, general layout planning, renewable energy utilization and environmental protection. 2. 1 project site selection planning is an important part of land saving, and it is also closely related to traffic. FAW-Volkswagen Tianjin Factory is located in Tianjin Future Science and Technology City, and the following points are mainly considered in the site selection. 2.2 After the site selection and land use of the master plan project are determined, the master plan is the key point for the application of land-saving technology in green industrial buildings. Consider reserving a site for the development of new energy vehicles in the later stage, and the project will be built in stages at one time. Logistics organization combines the pre-planning experience of automobile factory, based on lean concept, and takes logistics distribution as the center to build a super-large joint factory. This general layout is the current development direction. Compared with the past U-shaped or parallel layout, it has obvious advantages in land saving and short logistics route. Combined with the process flow of the project, the stamping workshop, stamping parts storage place and welding workshop of the project are jointly arranged to reduce the transportation distance of materials; The welding workshop and painting workshop of the project are connected through the air corridor, which is responsible for the transmission of parts, minimizing the logistics consumption during transportation and saving land; Assembly workshop, maintenance room and technical center constitute an assembly joint workshop. In the past, the general layout of factories often used SLP method. With the development of logistics industry, EMplant and other software have been applied to small-scale logistics and production line logistics analysis. Logistics simulation analysis is of great significance for lean production and zero inventory. Reasonable factory logistics layout is one of the most important measures for operating units to save costs. 2.3 renewable energy utilization renewable energy includes photovoltaic, photothermal, geothermal and air energy. According to the geological and climatic conditions of this project, it is determined that the renewable energy available for this project is mainly solar energy. Utilization forms include photovoltaic power generation and solar hot water. Tianjin belongs to the third kind of solar energy resources, with superior grid-connected access conditions, strong local absorptive capacity and good distributed photovoltaic power generation conditions. Considering the requirements of building appearance, roof area utilization rate and power generation, about 40,000 solar cell modules with a power of 280W are arranged in roof areas such as assembly workshop and welding workshop technology center, with a total capacity of 1 1mw. The power generated by the power station is boosted to 10kV, and directly merged into the regional power grid 10kV system. Production department personnel use solar hot water for bathing, and the joint station building is equipped with a centralized domestic hot water system, which is delivered to all user departments respectively. Solar hot water system is used to assist high-temperature hot water heating. The solar collector used is Z-QB/0.06-WF-2.50/30-58, which consists of 30 all-glass double vacuum glass tubes. Control system: The controller adopts Siemens programmable S7-200PLC (Chinese) controller. It has the functions of displaying parameters such as time, temperature, water level, operation status, energy consumption measurement, fault alarm and remote monitoring of mobile APP. It has the functions of lightning protection, leakage prevention and high temperature prevention. A network interface is reserved in the control box.

Third, the application of green technology in the design stage

FAW-Volkswagen Tianjin Factory standardized the design process of green industrial buildings at the design stage, and added a special chapter for green industrial buildings in the preliminary design text and construction drawing to realize the integration of green building design consultation. And calculate the green technology investment and payback period in detail, evaluate the total score of green industrial buildings, and optimize the construction drawing design. 3. 1 technical and economic analysis 3. 1. 1 waste heat utilization of drying furnace in painting workshop In order to further reduce the energy consumption and heat energy emission loss of painting workshop, the heat energy of drying furnace exhaust gas is recovered, and this heat energy is introduced into the pre-washing or pre-degreasing process of pretreatment process to further release energy and reduce the direct heat energy emission loss. According to the calculation results, in the process of pretreatment and pre-washing, the energy of oven exhaust gas is directly used for heating in daily production, which solves the energy loss of about 549.3kw in pre-washing production. According to the design data of the production line, the annual energy saving Q=6.3× 109KJ, which is equivalent to 2 15 tons of standard coal. 3. 1.2 solar energy utilization Bath hot water is provided by solar hot water system. According to Code for Water Saving Design of Civil Buildings (GB50555-20 10), the water consumption quota of this project is determined as follows: public bathroom shower: 35L/ person/time; Staff canteen: 7L/ person. The area of solar collectors in this building is 1575m2, and the annual hot water output is 20708+0m? The hot water provided by renewable energy accounts for 34% of the total hot water. The annual cost saving is 8 1.43 million yuan. The annual sunshine duration in Tianjin is about 2200 hours, and the annual average solar radiation on the horizontal plane in recent years is 50 16MJ/m2. It belongs to the third kind of solar energy resource area in China and is suitable for building solar photovoltaic power generation projects. The solar photovoltaic project of Tianjin factory adopts the form of contract energy management. Solar photovoltaic panels are installed in the welding workshop, assembly workshop and technical center, and the photovoltaic load on the roof is 0.2kN/m2, which is included in the static load, so as to make full use of the roof space of the workshop and reduce the utilization of land resources. It is preliminarily estimated that the paved area of solar photovoltaic is 2 10000m2 and the installed capacity is 1 1Mw. After preliminary accounting, the carbon dioxide emission can be reduced by 14330.72 t/a, and the total annual electricity consumption of the project is12155000 kwh/a.3.2 Optimization design of construction drawing 3.2. 1 simulation analysis of outdoor ventilation in peacetime. By simulating the velocity field and vector field in the workshop, It provides reference for the selection of new air outlet position, exhaust outlet position and natural ventilation mode in HVAC design, especially plays an important role in improving indoor air quality in workshops, energy saving in building systems and environmental protection. The four workshops of stamping, welding, painting and final assembly have good natural ventilation effect, uniform ventilation and smooth air circulation. The wind speed is between 0.2~ 1.3m/s, and reaches 1.4m/s locally. The wind speed is relatively small, and the air exchange times are all more than 2.00 times/h. In order to make rational use of natural light and reduce lighting energy consumption, the proportion of external windows should be increased as much as possible and skylights should be set to ensure the natural lighting effect. Skylights are installed in the workshop of this project, which can effectively improve the natural lighting effect of the factory and reduce the energy consumption of indoor lighting operation. The roof lighting window adopts circular arch electric lighting and smoke exhaust skylight, and the lighting material adopts three layers and double cavities, with a thickness of16mm; The color is translucent milky white (light transmittance is 32%-35%), and the technical indexes of the die clone board meet those specified in JG/T116-1999 polycarbonate (PC) hollow board. 3.2.2 The greening varieties in the optimal design of garden plants are all suitable for large-scale industrial planting, and the screened varieties have the characteristics of wind resistance, drought resistance, cold resistance and good adaptability. At the same time, it also has good air purification characteristics, which can play a very good role in dust reduction and smog. Some aromatic plants also have the effects of relieving fatigue and clearing the brain. The greening tree species selected in this project fully consider the soil properties and climate characteristics in this area, and choose plants with moderate and strong saline-alkali tolerance, waterlogging tolerance, SO2 tolerance and cold tolerance. The table below shows some seedlings.

Fourthly, the application of green technology in the construction stage.

In the construction stage, the implementation of green technology and the collection of materials are the key. After the start of the project, the compilation of special articles on green industrial buildings in construction bidding, the collection of image data in the early stage of construction, the compilation of material list and the formulation of collection management system during construction have been completed. 4. 1 The topographic map photos taken by the pre-construction data collection (1) should reflect the topography before construction; (2) If there are ancient and famous trees in the site, the migration process or protection measures should be photographed; (3) If there is a shallow or surface water system in the site, the location should be photographed and the protective measures should be recorded; (4) If there is topsoil, the distribution of topsoil should be photographed, and the image should be recorded when the topsoil is used for greening in the later period; (5) As-built drawings of protection measures for industrial buildings near mountains and rivers and related image data. 4.2 Data during construction: Collect the image data of important engineering nodes retained during construction. Determine the contact person for data collection during the construction, and start collecting data after the construction, and the supervisor will cooperate with the collection. The list of data to be collected is as follows: (1) Energy efficiency values of all public facilities (product manuals or nameplates should be kept in refrigerators); (2) Product specifications of exterior doors and windows; (3) performance test report of external wall and roof insulation materials and test report of heat transfer coefficient of external window; (4) Inspection report on thermal insulation materials of walls and doors of cold storage, greenhouse and drying room (provide on-site sampling inspection report when necessary); (5) External window air tightness inspection report and on-site sampling inspection report; (6) Measures to reduce the leakage of equipment and pipe network; On-site image data (taken during construction); (7) Product description of water treatment equipment (including data such as energy consumption level, efficiency and noise value parameters). ); (8) Final accounts of civil engineering and decoration engineering; (9) coating engineering acceptance report; (10) Receipt of corrosion-resistant or permeable concrete; (1 1) concrete corrosion resistance or impermeability inspection report; (12) Product description, factory certificate and entry record of building materials with wastes as raw materials; (13) supply contract for concrete, prefabricated building components and steel; (14) Test report on harmful substance content of decorative building materials products; (15) mobilization report of decorative building materials; (16) Product description of main materials of glass curtain wall and its reflection performance test report, etc.

Based on the construction of Foshan and Qingdao factories, FAW-Volkswagen Automobile Co., Ltd. takes Tianjin factory as the practice object, gradually improves the standard system of green industrial building construction, integrates green concepts into all aspects of construction and development, and forms a list of applicable technologies for green industrial buildings in automobile assembly plants. The standardization process of green industrial buildings will be further improved in the construction and later operation of the project. The practical experience of FAW-Volkswagen green industrial building has reference significance for the construction of automobile factory in automobile industry.

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