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In order to promote the development of biogas project in cold northern rural areas, this paper introduces some details about a set of warming system compounded with biogas and the waste heat from industrial boiler’s flue gas or solar energy ,which can makes the biomass fermented normally even if the weather is so cold that the reaction is slow. Facing to the problem of the unreasonable use in waste heat of industrial boiler’s flue gas, the warming system provides a reasonable way to utilize. Compared with the effect of raising temperature and the heat loss in biogas system, the warming system can ensure the stable operation of the biogas project. This paper can provide a reference to the construction of supporting facilities in biogas warming system in cold northern rural areas. 1. Existing problems in utilization of biogas in the rural area Currently, there is a "South More-North Little" imbalance of biogas development in rural areas. In terms of production and consumption, biogas used in North China is significantly less than South China. Biogas utilization differences between the North and South is fundamental temperature difference. Studies have found that fermentation of biogas can be divided into 3 stages, the fermentation at room temperature 10~26°C, the medium temperature zone in 28~38°C (the optimum temperature is 35 degrees centigrade), 46~60°Cis the high fermentation temperature zone. In these three temperature zones, fermentation gas can be produced. In this temperature range, the higher the temperature is, the more active the microbial activity is, the more the gas production is. Microorganisms are very sensitive to temperature changes, temperature suddenly rise or fall will affect the microbial life to cause the deterioration of the gas-production quantity. Temperatures on both North-South differences, in the utilization of biogas in the North area, there is the question that the rate of gas production will fall sharply in winter affecting the utilization of biogasseriously. 1.1 Biogas Insulation System Design In the cold weather of northern China, biogas fermentation tank’s heat radiates quickly, so we need to make insulation for it. There are many existed insulation measures. Large and middle scale biogas engineering mainly uses fossil fuel hot water boiler, biogas, solar, biogas power generation and waste heat utilization to heat and so on. Currently rural areas in the north China, there are many small rural enterprises in which the waste heat from boiler fuel gas alwayscan’ttake a good use so as to cause much waste. So as for the thermal insulation in rural small and medium scale biogas engineering, one way is combining the waste heat from boiler fuel gas in small rural enterprises with the solar energy tomake thermal insulation of biogas tanks. 5th International Conference on Information Engineering for Mechanics and Materials (ICIMM 2015) © 2015. The authors Published by Atlantis Press 1583

A Warming System Compounded with Biogas and Waste Heat from Industrial Boiler’s Flue Gas or Solar Energy