Removal of ammonia from coke-oven gas at PAO Severstal’ by a circulatory phosphate method

Abstract

The industrial introduction of ammonia removal from coke-oven gas by the circulatory phosphate method at byproduct shop 2 in coke production at PAO Severstal’ is considered. The ammonia removed undergoes thermal decomposition. The system consists of three channels (including a backup) and is designed to process coke-oven gas at a rate of 170000 m³/h. The phosphate method is selected after comparing methods of ammonia removal. The startup and operation of the system are analyzed. Operating conditions corresponding to specified ammonia removal are selected. Data are presented regarding the ammonia absorption, the regeneration of the absorbing solution, the thermal decomposition of the steam–ammonia mixture, and the utilization of the smokestack gas from the combustion of the steam–ammonia mixture. With a design productivity of 85000 m³/h for a single channel, the system operates satisfactorily when the throughput of coke-oven gas is in the range 60000–130000 m³/h per channel.