银电解液热分解烟气脱硝工艺研究与生产实践

Research and production practice of denitrification of the flue gas from silver electrolyte thermal decomposition

某公司采用热分解工艺实现银电解液除杂的目的,但在热分解时会产生较大浓度的氮氧化物烟气,虽然采用碱液吸收,但是尾气仍然不能达到国家排放要求。通过对四种脱硝工艺的脱硝原理及使用条件进行对比,最终选用还原吸收脱硝工艺达到治理NO_x的目的。该工艺采用氧化剂A将NO转化为NO_2,采用还原剂B在特殊结构的转化塔中把NO_2气体还原成无害的氮气和二氧化碳。经过试验及工业实践,证明采用此工艺可以将银电解液热分解工艺的尾气中氮氧化物降到100 mg/m^3以下,达到国家排放标准。

A company used the silver electrolyte thermal decomposition process to achieve the purpose of electrolyte removal.However,a large concentration of nitrogen oxide fumes was generated during thermal decomposition.Although alkali absorption was used,the exhaust gas still could not meet the national emission requirements.By comparing the principles and the use conditions of the four denitrification processes,the reduction absorption denitrification process was adopted.The process used oxidant A to convert NO to NO2,and reduced NO2 to harmless nitrogen and carbon dioxide in a special structure conversion tower using reducing agent B.After industrial practice,it was proved that this process could reduce the nitrogen oxides in the tail gas of the thermal decomposition process of silver electrolyte to below 100 mg/m^3,meeting the national emission standards.