How to compensate the lost temperature of the digester in cold climate

Abstract

Temperature and temperature shock have been a kind of key factor to influence the digestion process stability in anaerobic digesters in cold climate, especially using energy crops in the feedstock for its self-heating. Firstly, it is described the energy application in the multiphase flow field of anaerobic digester, such as the heat energy supplied by burning biogas from itse1f as fuel, solar energy, the traditional biomass energy, geothermal energy and etc. Secondly, this study constructed a new pattern of ground-source heat pump heating integrated system to compensate the lost temperature of the digester and maintain the operation process stability in cold climate. In the meantime, we get the preliminary result about the average tank volume aerogenesis rate of the system, the culmulative electricity cost, the culmulative biogas yield in the mathane tank at different time. Lastly, it was discussed how to keep the stability of the temperature field in mathane tank depending on practice covered how to select a optimum digester temperature setting and a reasonable temperature increase, how to adjust the heating system, to keep energy balance and to estimate feasibility of reactor system.