A system including enriching coal bed methane by solar energy and selective catalytic reduction

Abstract

Enriching CBM (coal bed methane) and then making good use of the enriched CH4 have great significance in protecting the environment. This paper proposes a new system that uses solar energy to enrich CBM and then utilizes the enriched CH4 as the reductant in SCR (selective catalytic reduction) of NOx with a new catalyst (La0.8Sr0.2MnO3). Theory research, numerical simulation, experiments were done to investigate the key factors of the enrichment such as the initial CH4 concentration, the temperature field. Results indicate that when the temperature difference ΔT=450-300=150K, 200 enriching pipe units as in this experiment model can make the final mole fraction of CH4 reach to 80%.Besides, a new SCR of NOx by CH4 with catalyst La0.8Sr0.2MnO3 is presented in this paper and the enriched CH4 is the reducing agent. Experiments were done to investigate the efficiency of the new catalyst. In the new CH4-SCR system, the maximum conversion ratio of NO can reach to 80% and the mass concentration of NO at the outlet can be lower than 20 mg/m3 in a proper condition. This new system can make good use of the solar energy to enrich CBM and present an efficient way to use the enriched CBM, which is friendly to the environment.