低温烟气中氮氧化物的吸收转化和资源化利用OA

Nitrogen oxides(NOx)are major contributors to air pollution,posing serious threats to the ecological environment and human health.With the development of new energy and the adjustment of energy structure,the operation of gas turbine units at low load has become the norm.The temperature of the exhaust gas(<180℃)does not match the temperature window of SCR technology,which hinders the further reduction of NOx emissions.If low-temperature and efficient technologies can be developed and NOx can be utilized resourcefully,it will not only reduce current air pollution but also generate certain economic benefits.Based on the traditional low-temperature wet flue gas denitrification technology,this experiment formed three innovative technologies:Low-temperature solid-phase liquid membrane denitrification for exhaust gas,electro-catalytic reduction of nitrate waste water to produce ammonia,and rapid microwave enrichment of low-concentration ammonia water.A system for NOx exhaust gas denitrification and resource utilization under low-load conditions of gas turbine units was designed,achieving the conversion of NOx exhaust gas→nitrate wastewater→ammonia.The NOx absorption efficiency of this system could reach 82.7%,and the Faraday efficiency was 80.0%.The ammonia production rate was 0.76 mmol·h−1·cm−2,and the microwave desorption rate after electro-catalytic ammonia production could reach 97%.The experiment had achieved multi-level waste reduction and multi-link energy saving,providing a solution for NOx exhaust gas denitrification under low-load conditions of gas turbine units.