Research On Anaerobic Fermentation Reactor Dynamic Heat Transfer Characteristics And Energy Consumption Prediction In Cold Area

Owing to relatively low temperature and ground temperature Serious impacted onfermentation of biogas plants in the northern alpine region, the projects always need to heatedmaterial liquid，raise the temperature of the cell (insulate the digesters) to ensure normal operationin biogas plants in winter. So the Research on the energy consumption in the biogas plants becamethe focus. And the anaerobic reactor is the core device of the large biogas methane fermentation,where propagation of microorganisms，organic decomposition and biogas generation all live.Therefore, the structure and operation of the reactor is the focus of the study of the biogas plants.Studying the heat consumption among heat transfer can predict the main energy consumption inthe biogas plants, and then can designed and select the most reasonable equipment. That establish areasonable heat transfer model of the reactor is the premise after the reactor heat consumption iscalculated.Static designs are lack of analysis of the annual energy consumption, only consider the mostunfavorable conditions, and often give a great deal of error to the results. Dynamic simulationmethod has the advantage: consider the various factors more small and the results would be moreaccurate. The application of dynamic simulation are always calculated heat consumption, but thecomplexity of the calculation process requires the help of a large computer.In this context, this paper launched the following studies:The first part focuses on the energy analysis of the theoretical research methods. The one isSteady heat transfer on the basis of the theory of static energy consumption analysis, the other isbased on the theory of unsteady heat transfer dynamic energy simulation. The paper describe thesuperiority of the dynamic energy simulation method.. In addition, the paper highlight the solutionan effective method for solving the heat conduction equation-Laplace transform. After thischapter describes and analysis, heat transfer analysis and experimental research for anaerobicreactor biogas plants has laid a theoretical foundation in the subsequent cold regions.Secondly, by drawing on wall non-steady-state process of the construction sector, the paperexpand from flat-wall heat transfer to the cylinder wall heat transfer and heat transfer between theenvelope and the soil to study heat transfer energy consumption of the reactor in biogas plants. Thepaper use the Dynamic simulation method-response factor method to analysis the energyconsumption of biogas plants anaerobic reactor in the cold regions to establish a non-steady-stateheat transfer model: top,wall,bottom of the anaerobic reactor, and then consolidated to establish the complete structure of the reactor cooling model.After the model, the third part based on Microsoft Visual Basic6.0as a platform and developto dedicate biogas anaerobic reactor heat transfer analysis and energy consumption predictionsystem in the cold regions, develope anaerobic reactor system full dynamic simulation by usingsoftware, analyze the the anaerobic reactor heat consumption, and provides a convenient means fornon-steady-state heat transfer calculation.The fourth part set a data monitoring system based on power control software by add thewarming of the heating system in Jixi City, in the Lan Ling large-scale biogas fermentationengineering, and collect the data of the heating system in the biogas station under the normaloperation. By data analysis among a heating period, the paper obtain the energy consumption ofthe entire fermentation system, and verify the feasibility of the thermal model.The fifth part use the non-steady-state model to calculate the heat consumption and comparedwith the steady-state case to analysis non-steady-state mode hold the superiority; and then basedon the heat transfer characteristics of the anaerobic reactor, combined with the problems of thecurrent the biogas plants reactor energy saving measures to improve the existing energy-savingmeasures, to achieve the energy efficiency requirements of biogas plants.