Study On Control Strategy Of Biogas Aerodynamic Air - Fuel Ratio In Variable Group

Energy shortages and the deterioration of ecological environment is the main problem facing humanity in the 21 st century. Biogas as a high calorific value, clean and renewable energy, with enormous social and economic value, has aroused great concern. Biogas combustion process, the air-fuel ratio is a key factor in the combustion efficiency, engine performance and emissions performance impact of methane in the combustion process of the air-fuel ratio control, stable combustion process, increase the burning speed, thereby improving combustion efficiency. In biogas technology research and development process, its composition changes too large air-fuel ratio control difficult, so how variable component of biogas power air-fuel ratio control is the focus of current research problems.Firstly, aiming at the gas parameters and biogas engine operating conditions change caused by empty fuel than fluctuation of biogas engine gas supply system is studied, the reasonable design of methane gas supply system flow control scheme, in advance according to the air-fuel ratio control requirements of methane concentration of the disturbance is rapid and effective flow control. Which in order to satisfy the gas flow control scheme requires design a kind of gas flow regulating valve, and the valve in the biogas group points in different conditions of flow characteristics experiments are carried out and selects the NO.4 gas flow regulating valve which is best matching modification of biogas power generator group.Secondly, this paper studies the biogas engine air ratio control strategy, respectively based on PID algorithm and fuzzy PID control algorithm of biogas in the combustion process in air fuel ratio control, the air / fuel ratio stable near the theoretical value, modifications to the KHC-6500 S single cylinder gasoline engine structure of biogas power generation unit as the research object using GT-POWER and MATLAB / Simulink platform establishment of air-fuel ratio control simulation model to verify the air-fuel ratio controller is feasible for coal-fired. The results show that the fuzzy PID algorithm is used to control the air fuel ratio, the system has better control precision and stability.Finally, the actual air-fuel ratio prototype fuzzy PID control experiment. When changing the gas components were studied separately for the starting condition, no-load conditions, load conditions. Experimentally determined the starting condition of the excess air ratio and the different components corresponding optimal load and excess air ratio; experiments showed that when loading excess air ratio control herein, less volatile, short response time. In this paper, the design of the gas supply system and variable components of biogas power air-fuel ratio control system works well to achieve the desired objectives.