Abstract: Based on low calorific value and recovery amount of converter gas from the present various steel mills, a new process on the basis of the industrial trial in a converter with 35 t steel capacity from Echeng Iron and Steel Co.,Ltd. was proposed for preparation of highquality converter gas. By comparing the injecting rate and various carbon materials injected into the converter vaporization cooling flue, the effects of which on the quality and amount of converter gas are therefore investigated. The results show that, with increasing the injection amount of carbon materials, the volume fractions of O2 and CO2 in the gas are decreased, yet CO and H2 in the gas are increased correspondingly. When the rate of pulverized coal injection is 30 kg/min, the volume fractions of O2 and CO2 in the gas are decreased by 63.92 %, 41.19 %, but CO and H2 in the gas are increased by 20.09 %, 240.18 % and the recovery time of gas is increased by 11.40 %, respectively. Therefore, this process is beneficial to improving the quality and amount of converter gas.

Key words: converter gas recovery, vaporization cooling flue, injection, pulverized coal