炼钢一次除尘蒸发冷却器供水工艺控制优化

OPTIMIZATION OF PROCESS CONTROL OF WATER SUPPLY FOR AN EVAPORATION COOLER

转炉一次干法除尘蒸发冷却器的作用是对烟气进行降温、调质以及粗除尘,是整个干法除尘系统的核心设备,其设计尺寸、供水工艺控制的优劣对蒸发冷却器及其后续设备的运行稳定性有极其重要的影响。以上海梅山钢铁股份有限公司二炼钢4号5号转炉一次除尘LT系统为例,除尘工艺设计及关键设备引进GEA公司。该系统于2012年4月陆续热试投产,至今出现了蒸发冷却器和静电除尘器入口分布板严重积灰的问题,对转炉生产造成了严重影响,进而影响了整体效益。通过充分了解国内外蒸发冷却器先进的供水工艺控制技术,发现该一次除尘蒸发冷却器存在供水工艺控制模型落后、供水量超调严重、蒸发冷却器出口烟气温度波动较大等问题。并采用吹炼初期阶段阶梯供水模型对其进行优化。

The evaporation cooler of the primary dry dedusting system for converter is the core equipment of the whole system,its main function is cooling,conditioning and coarse dust removal. The size and water supply process control of evaporation cooler have an extremely important impact on the operation stability of evaporation cooler and the follow-up equipment. When the size of evaporation cooler determined,the advanced water supply process control is the key factor. Taking the LT system for No.4 & No.5 converters in No.2 Steelmaking Plant of Shanghai Meishan Steel as an example,the system began operation in April 2012,and the process and key equipment were supplied by GEA. Then there was a serious problem of dust accumulation in evaporation cooler and at the entrance gas distribution plate of electrostatic precipitator,which seriously affected the production of converter. By fully understanding the advanced water supply process control technology of evaporative cooler in the world,it was found that the water supply process control model of the evaporative cooler of No. 4 & No. 5 converters in Shanghai Meishan Steel was backward,oversupply of water was serious and gas temperature at the outlet of evaporative cooler fluctuated greatly. The stepping water supply model at blowing start stage was used to optimize the system.