GAS EMISSION TREATMENT TECHNOLOGY FOR BLAST FURNACE
This paper has summarized the research and application process of gas emission treatment technology for pressure equalizing & releasing and scheduled delay in blast furnace.Since 2014,the dry gas recovery technology of blast furnace equalizing pressure release has been gradually promoted and applied in the Beijing-Tianjin-Hebei region.After several iterations,the complete recovery technology of equalizing pressure gas dry by injection method has finally been formed,which is"three-stage dust removal+efficient injection+intelligent control".The technology is mature and reliable,and has been successfully applied in most blast furnaces in China.The research on blast furnace shutdown gas treatment technology is still in the development stage.The current mainstream technology is to use the existing gas purification facilities to forcibly recover the low-pressure gas in the blast furnace at the end of the blast furnace scheduled delay and before the top vent valve is opened into the pipe network by connecting the ejector in the pressure regulator group area.It can achieve full recovery to achieve all receivable.At the end of the scheduled delay,the pressure drop of the top of the blast furnace can reach 0～1 kPa before the top release valve is opened.However,this technology is only applicable to long-term and short-term scheduled delay,not applicable to downsizing emergency scheduled delay.Considering the danger of process operation during scheduled delay,the gas recovery must be conducted under safety circumstances.Environmental protection,energy consumption,investigation and running cost should be taken into account during technology selection,with the best cost performance to be benefit to sustainable development of iron and steel corporation.
万方数据
维普
