Experimental Research Of Producing Mechane With Solar Heating In Cold Areas

In cold areas, because of the low air temperature and the low ground temperature, there are many problems about producing methane. For example, the rates of producing and using methane are low, even the digester fermenting is freezed. It presents a new thought about producing methane with solar heating in accordance with these problems in the paper .The hot water by solar energy collecting system producing heats solution via steel pipe heat exchanger at the bottom of the digester fermenting. Then the solution temperature rises and accordingly ferments and produces methane. At the same time, the system can increase temperature of the digester fermenting and decrease energy consumption by insulating the digester fermenting. The paper is prior to experimental study. It is proved that it's feasible to produce methane with solar heating in cold area through the analyses of the experimental data and the numerical simulation.It presents detailedly basic theory about solar radiation,soil temperature field and generation of methane. And it establishes the math model of astatic heat transfer around the digester fermenting. The math model is dispersed by the use of control volume integration.Then, it presents composing of the experiment system and preparing of the experiment devices. It analyses the data of steady operation in summer and in winter. Through analysis, we can know the change condition about the soil temperature around the digester fermenting,the temperature of solution and heat-transfer content. At one time, it gives the value of heat-transfer coefficient.At last, the computer program is worked by MATLAB. It simulates heat-transfer content,the soil temperature around the digester fermenting and operation condition of the system all the year around. Then it analyzes the variant rule of the soil temperature around the digester fermenting. Through comparing experiment value with simulation value, it proves the validity of the model.