Research On Energy Analysis Of Biogas Projects In Cold Regions And Energy-saving Technology

When the biogas project runs at a lower temperature in the condition of cold regions, it requires for pre-heating the fermented liquid feed by external heat source, inside the reactor also requires for heating in order to maintain the temperature of fermentation, which will spend a lot of energy. To save energy, the energy biogas projects were analyzed to determine the minimum energy consumption, while the maximum capacity. In the past, biogas energy project analysis was based on a simple heat transfer model, which was lack of annual energy consumption statistics biogas project design specifications on insulation.In this paper, the engineering parameters of Jixi City Lan Ling, a large-scale biogas projects in cold regions were measured, the temperature in the reactor and the heating value of methane gas were also measured on this basis. The energy consumption of different fermentation temperatures and heating engineering and capacity to conduct a statistical analysis for biogas projects running in cold regions and provides a standardized basis.Under the above background,this paper carried out the following research:The first part focuses on the theoretical research method of energy analysis. One is the static energy consumption analysis based on the steady heat transfer theory, the other is based on the theory of dynamic instability of heat transfer on energy consumption analysis, discussed the research method is more applicable to the static energy consumption analysis——Multiply Day Method. This part of the presentation laid a theoretical foundation for the analysis of energy consumption of biogas engineering.The second part established the load coefficient model of reactor, determined the method for the analysis of energy consumption of biogas engineering. This method has analysed each part of the energy consumption of the biogas project, the biogas project each month consumption trend, gradually increased with the decrease of average temperature and the outside world, in January the annual energy consumption of biogas engineering. And on this basis, through the establishment of a net capacity of each month at different temperature, obtained the optimum fermentation temperature anaerobic fermentation reactor is 35 degrees Celsius.The third part based on the engineering data base of Biogas Engineering in Jixi City, the Blue Ridge, the gas component of the biogas project and the gas calorific value were determined.On this basis, through the method of reactor load coefficient model and biogas energy consumption analysis, the energy consumption and the production of Biogas Engineering in different heating methods of statistics. Discussion on the characteristics of heating mode and capacity situation, get the ground source heat pump in heating mode is not affected by the condition, can save a lot of energy. At the same time allows the technology and conditions, heating and solar energy heating mode compared with the traditional coal-fired boiler heating utilization of biogas power generation waste, has the advantage of energy saving.The fourth department of the thesis established the temperature drop model of the reactor, through the actual measurement of the internal temperature of the chicken broccoli Ling biogas reactor model value and calculated value for comparison, to verify the accuracy of the model. And on the basis of this model, the calculation to ensure the process temperature drop of not more than 1.5 celsius under the condition of anaerobic fermentation reactor, the minimum thickness of insulation layer theory of biogas project and run the longest shut-down time. It provides a strong basis and specifications for the production and operation of anaerobic fermentation reactor design.