Study On Methane Generator Cooling Water Preheating Methane Filling Pool System

As the acceleration of the process of economic globalization and the growing population, the demand of energy increases day by day and the energy crisis is becoming the problem that human being has to face. Therefore, the development and utilization of renewable energy and improving the energy efficiency is very important for sustainable economic development in our country. As a kind of renewable green energy, biomass energy has many advantages, such as it is widely-spreading, cheap, can be directly used and has low pollution. As one kind of the biomass energy, methane is used most extensively, especially the methane produced in large and medium-sized methane engineering. So far, the methane is mainly used for power generation. In the power generation process, the heat value is low and the excessive heat dissipated into the air has accelerated the greenhouse effect level. Therefore, how to increase the heat value effectively is the problem needs to be solved urgently in the methane research.To solve this problem, By the calculation of thermal value, the feasibility of using waste heat retrieved from power generation system to warm up the methane pool to the mesophilic fermantation level is demonstrated. Meanwhile, a device for preheating cooling water is designed, it utilizes the waste heat of cooling water of the generator to warm up the fermentation liquid, to solve the problem when adding the filling material to the fermentation pool, the temperature decreases significantly and the gas production rate will be inhibited. What's more, the automatic feed in biogas project is realized by using of the automatic control function of singlechip. The research work has positive meaning of energy conservation and enviromental protection.In the design process, the heat source and heat transfer equipment is the key to the success of the system. Firstly, through simulation of software, the thermodynamic model about cooling water tank, heat exchanger and filling pool is established. Aiming at the heat generation characteristics of the cooling water heat source and the heat transfer character, taking into account of the cooling way of internal combustion engines, the whole heating process of the system and the heat insulation effect of the filling pool, a reasonable system configuration has been set. Then, through verification of the system by experiment, the components of the system equipment and the process to set up platforms are introduced, according to the results of the experiment, the temperature of both filling material and cooling water, and the situation of change about the temperature difference of the inlet and outlet of the heat exchanger are analysed, the feasibility is also validated. Finally, the automatic control system based on the microcontroller is designed as well as the automatic control of heating and feeding has been realized.The development of the device for utilizing the waste heat of the methane generator is in accordance with the'energy conservation and waste recovery' spirit advocated by the state. The whole structure of the system is relatively simple, the cost is relatively low and the economic feasiblity is good. The successful application of it in large and medium-sized fermentation engineering can reduce the heat waste of the generator. The energy recycling can be realized and this can bring tangible benefits for both the enterprises and society. Meanwhile, it lays a solid experimental foundation and explores a new way for further comprehensive utilization of the waste heat of generator and the realization of preheating and heat insulation of the whole fermentation system.