Study On Performance Of Complementary Energy Utilization System Of Coal Mine Ventilation Air

The coal mine ventilation air is a good low temperature waste heat resource with the temperature and the humidity remaining17℃~23℃ and 60%~75% respectively. As the ventilation air containing a large of low concentration methane,which will lead to greenhouse gas emissions and bring serious environmental problems and a great waste of energy. Thus,the coal enterprises must take measurements to utilize the ventilation air. In this paper,the comprehensive utilization system of ventilation air complementary energy was put forward and utilization technologies of sensible heat and latent heat of the coal mine ventilation air were studied experimentally. By considering the actual exhaust parameters of a mine, the efficiency of the system was analyzed.The paper describes the operational principle and system composition of the comprehensive utilization system. The calculation and design are made for an oxidation device with a capacity of 10Nm3/h, and honeycomb ceramic regenerator volume and size of oxidation chamber was computed. The laboratory devices of ventilation air methane(VAM) oxidation and spray chamber system are constructed. The influence of various operating parameters such as methane concentration,inlet air velocity,half cycle and ventilation air humidity on the performance and stability of the oxidation device was studied experimentally. The experimental results show that the optimal half cycle of the device is 60s~90s,the minimum self running methane concentration is 0.8%,the optimal exhaust air speed is 0.245m/s ~ 0.294m/s. With the increase of ventilation air humidity,the level of oxidation temperature field,the VAM oxidation efficiency and the temperature of exhaust gas decrease.The utilization schemes of ventilation air complementary energy were offered against the certain VAM emission parameters. By considering the experimental results of VAM oxidation and sensible heat recovery,the economic benefits,environmental benefits of the system and its project feasibility were analyzed. The results show that the comprehensive utilization system has good economic benefits and environmental benefits,compared with the traditional coal-fired unit for power generation and heat supplying.