Chemical equipment Liang Suzhen, Liu Tienan, Wang Wenfan, Li Lin, Du Qian (Henan Provincial Key Laboratory of Forest Management and Environmental Microbiology, Heilongjiang Institute of Forest Engineering and Environment, Harbin 150081, China), in addition to trace water vapor and H2S Other miscellaneous gas. The refined methane content of biogas can be as high as 93%, and the quality is comparable to natural gas. However, biogas belongs to the field of flammable and explosive gas fuel. This study combines the biogas membrane refining, storage and transportation process and characteristics, dehydration, desulfurization, deamination, membrane decarburization and high pressure storage and transportation before biogas membrane purification. The safety research was carried out in various aspects, and the structural design and finite element analysis of the main components of the low-pressure buffer tank were carried out. From the perspective of safety, suggestions were made for biogas production, membrane refining, storage and transportation, and a safety analysis system was constructed to improve the biogas energy grade. And expanding the scope of biogas application to provide a strong 937: A biogas is a renewable, environmentally friendly new energy source, produced by microbial anaerobic fermentation, although a wide range of sources, but only artificial fermentation biogas can be directly used. The low calorific value of biogas is the bottleneck of its industrialization. Through the biogas refining project, the gaseous biogas produced by the biogas digesters of various types of fermentation materials is used as the raw material gas, and the advanced technology of gas separation in the chemical engineering discipline is used to dehydrogenate and desulfurize the biogas. , decarbonization, enrichment and purification of methane (CH), and then refined into natural gas-grade gas through compression, storage and transportation, and can be applied to the fuel fund project: Heilongjiang Provincial Finance Department special fund (2014-01SCZP); Daxing'anling Science and Technology Information Department (2013DXAL-01H); Harbin Science and Technology Innovation Talents Research Direction. In the fields of gas automobile, urban residential pipe network, chemical synthesis gas, etc., according to the specific characteristics of low gas production pressure of gas, gas volume and controllable size, the toxic and harmful micro-gas which corrodes the equipment is removed first, and then gas membrane separation is adopted. The method separates methane from co2 from co2. Suggestions on biogas production, membrane refining, storage and transportation from a safety perspective, and then build a safety analysis system to provide a strong basis for improving biogas energy quality and expanding biogas application range. 1 Biogas membrane refining, storage and transportation process and characteristics At present, the deep processing technology for gas mainly includes chemical physical absorption method, low temperature cryogenic separation method, pressure swing adsorption method and gas membrane separation method 8 and the combined application process of these methods. Wait. The gas membrane separation method is mainly realized by the different permeation rates of the gas components in the membrane. The partial pressure difference between the two sides of the membrane is enhanced by the permeation driving force. The structural volume of the low-pressure gas storage tank container 1m3, in most cases, the length to diameter ratio of the container is 23. The diameter set in the experiment should meet the specifications of the head, the diameter is set to 800mm, check the "B/T4746 steel pressure vessel head" standard, Knowing that the head volume of this specification is 0.0796m3, it can be determined that the height of the cylinder is 1674mm, the long diameter is according to the diameter of the container, according to the "GB150-1998 steel pressure vessel standard", the allowable stress of the material; 0 welded joint coefficient. Calculate the wall thickness of the container to be 5.53mm, which is the calculated thickness. The nominal thickness is 10a for calculating the thickness and corrosion margin. To determine the strength and material properties of the low-pressure gas storage tank, the low-pressure gas storage tank The structure was subjected to finite element analysis. According to the establishment of the low-pressure gas storage tank structure model, the finite element software is used to set the material parameters and the solid mesh is divided. The applied load is 1.3 MPa, and the analysis results are shown. It can be seen from the analysis results that the deformation of the low-pressure gas storage tank is small and uniform, and the maximum deformation is 0.47 mm, which appears at the top of the head; the maximum equivalent stress is 102.1 MPa, which appears at the contact between the container wall and the head, which is much smaller than The yield limit of the selected material is experimentally designed; the minimum safety factor of the structure at the maximum equivalent stress is 2.43, and the safety factor is greater than 1, the structure is in a safe state. If the safety factor is less than 1, the structure may be in a dangerous state or even be destroyed. . Therefore, the analysis results show that the structural design of the low-pressure gas storage tank is feasible. for. Gas membrane separation technology is a highly efficient new separation technology. Organic membranes such as cellulose acetate membrane, polysulfone membrane, polyethersulfone membrane, polyamide membrane, etc. are used to separate CO 2 from natural gas and remove C 02 from biogas mining. The raw gas is a multi-component mixed gas, and the biogas membrane refining and storage and transportation process system is utilized. The membrane separation has the advantages of simple process, strong operation flexibility and low investment cost. The main processes of the biogas membrane refining and storage and transportation process system are described in this study. The biogas membrane refining, storage and transportation process flow chart, and therefore need to be rounded up to the thickness of the steel plate. In this case, the corrosion allowance is 2mm, and the sum of the calculated thickness is 7.53mm, and the closest steel plate product thickness is 8mm, so the thickness of the container wall is determined to be 8mm. This value meets the requirements of Q 235-B for thickness not exceeding 20mm. . 2.2 Finite element analysis of low-pressure gas storage tank structure For low-pressure gas storage buffer tank, according to the inlet pressure and gas volume of the membrane, the pressure is selected and the tank volume is designed and manufactured. According to the optimal separation efficiency of the biogas membrane module, the pressure is 1.2 MPa, so the working pressure of the low pressure gas storage tank is 1.2 MPa; the design flow rate *h' working medium is the compressed biogas, considering the discharge from the compressor discharge port. The gas temperature will change, take 150*C as the working upper limit temperature, and the working temperature range is selected as 0150*C. Design to make 2 biogas membrane refining medium and low pressure buffer tank safety study 2.1 Low pressure buffer tank structure design Low pressure gas tank structure For the schematic diagram, the inlet and outlet ports are all DN100 flanged connections. Safety valve Liang Suzhen, etc.: Safety study of biogas membrane refining process and structural design of low-pressure gas storage tank 'Air inlet beam 钰 钰 :: biogas membrane refining process and safety design of low-pressure gas storage tank structure research overall deformation map equivalent deformation map safety Coefficient diagram low pressure gas storage tank structure analysis results 3 biogas membrane refining process safety analysis system biogas membrane refining process involves biogas production, refining deep processing and industrial application. Safety analysis is to prevent and control biogas leakage, equipment corrosion, gas fire and explosion accidents. Corresponding measures and measures to reduce the occurrence of accidents and disasters provide a basis for establishing an early warning system. The indicators of refined biogas are based on the requirements of China's automotive compressed natural gas standard. The initial application is mainly located in the market for vehicle fuel and urban pipe network. According to the cause and prevention of accidents in China's vehicle fuel and urban pipeline gas, the application safety of refined biogas can be ensured. In the experimental research, the safety analysis system of the biogas membrane refining process is proposed. The safety analysis system of biogas membrane refining process 4 Conclusion The safe production and application of biogas membrane refining process should achieve the following items: (D reasonable arrangement of refining process in the gas concentration monitoring device; (2 prevention of ice crystal damage, in production If the equipment, pipeline or valve is blocked during the process, it can be dredged by methanol. If it is serious, it should be stopped. (3) Check the equipment, pipeline or valve regularly, and find that the equipment should be replaced in time if the corrosion is serious; (4) Design and installation equipment When selecting the material that meets the requirements, the pipelines, valves and equipment involved should be able to withstand the maximum pressure when the requirements of high-pressure transportation are required. The pressure vessel and equipment must be equipped with pressure gauges, safety valves, rupture discs, etc. The device shall be installed with a check valve between pipes or equipment of different pressures to prevent the gas of the high-pressure system from entering the low-pressure system and causing an explosion; * The storage tank without insulation protection shall be provided with a water spray cooling facility, a compressor room and a pump house. Should be equipped with good ventilation equipment to reduce the accumulation of flammable gases; strict control of pressure, gas flow, flow rate and 0 2 thick Detecting and preventing compressor explosion due to operational errors; (7) Each device must be inspected every year to perform physical flaw detection on key equipment to ensure normal operation of equipment and pipelines; (8 biogas membrane refining area should be based on ergonomics Requirements, set eye-catching safety signs, control the occurrence of open flames, equipment and pipelines have complete lightning protection and electrostatic grounding devices; (9 application of computer simulation design and simulation of the main working parts of biogas; (10 step by step to give the biogas film refining process) Standardized and standardized operating guidelines are becoming more sophisticated. Cheng Xiyu, Zhuang Guoqiang, Su Zhiguo. Research progress in biogas fermentation process Wang Gangxi IH屯 Wang Xin, et al. Utilization status and prospects of biogas technology in China Wang Haitao. Research on biogas filling technology and integrated equipment technology D. Guangxi University Master's Thesis, 2009, 5, Wang Haitao, Huang Fuchuan, Ma Kui, et al. Experimental study on biogas purification and compression canning Teng Yiwan, Wu French, Wang Hui, et al. Research progress of C02/tH4 polymer gas separation membrane materials Wang Zhen. Separation of methane/carbon dioxide by adsorption method D. Tianjin: Tianjin University, Science, Gao Jie, Guo Bin, Zhou Jianbin. Research Status and Development Trend of Membrane Separation of Carbon Dioxide Tonoyuki Suzuki, YasuharuYamada.PhysicalandGasTransportPrDpertlesofNovelHyperbranchedPoly'mideSilicaHybridMem-branes Huang Hansheng. Recovery and Utilization of Greenhouse Effect Gas Carbon Dioxide Wei Xing, Huang Weiju, Chen Wenmei. Research Status of Natural Gas Dehydration by Membrane Separation at Home and Abroad Yang Aijun, Zhang Lihong, Sun Liping, et al. Application of Membrane Technology in Natural Gas Separation Liang Suzhen, Wang Shuyang, Li Erping. The TRIZ-based biogas production refined compression storage and transportation system research national standard of the People's Republic of China. natural gas. GB17820-1999/1999, the national standard of the People's Republic of China. Compressed natural gas for vehicles Liu Yongjin, Hu Peiling, Guo Xinmin. Development Status and Prospects of Natural Gas Vehicles in China Wan Lifeng, Yin Yulin, Zhang Lijun, et al. Zhou Mengjin, a safety analysis system for urban gas pipeline networks. Biogas use technology DW. Beijing: Chemical Industry Press. 2006.18-23. Huang Puming. The fire safety management of urban biogas accumulation sites is a preliminary study. Zhu Gaoming, common knowledge of biogas engineering safety management. Safety operation procedures for biogas production and application Liu Zhenye, Zhao Siqi, Liu Ajing, et al. Infrared spectroscopy study of four physicochemical Chinese patent medicines. Proceedings of the 17th National Symposium on Organic Analysis and Bioanalysis, Nan Fucong, Li Jianping. Determination of trace gibberellins by molecularly imprinted electrochemical sensors based on labeled dendrimer-ferrocene. Proceedings of the 17th National Symposium on Organic Analysis and Bioanalysis, Guangxi University, Nanning, 2013.10:75-76, Li Gongke. Research progress in complex sample microextraction/chromatography online analysis technology. Proceedings of the 17th National Symposium on Organic Analysis and Bioanalysis, Nanning Guang (continued from page 53) has the advantages of simplicity, high sensitivity and good repeatability, but it is easy to cause environment due to the high liquid cost of its mobile phase. 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