焦炉气非催化转化装置换热管积炭的处理

Treatment of Carbon Deposit on Heat Exchange Tube in Coking Gas Non-catalyst Conversion Unit

1300℃左右的焦炉气转化气体通过废热锅炉换热管降温至250℃左右,其所含CO、CO2及CH4等成分在高H2存在的情况下,依次裂解析炭,粘结或沉积在换热管内壁上,降低换热效率,甚至堵塞换热管。在适当降温条件下,以高速气流分批冲刷换热管,吹除沉积炭粉,可恢复换热能力80%以上,可缩短检修时间80%以上。

The temperature of coking gas through the heat-exchange tube is reduced from 1300℃ to 250℃.Under the high hydrogen circumstance, CO, CO_2 and CH_4 are cracked in turn and deposited on the internal surface of the heat-exchange tube. This can reduce the heat exchange efficiency, even clog the heat-exchange tube up. Under the suitable temperature, the heat-exchange tube is introduced a high air speed to scour off the deposited carbon, it can recover more than 80% of the heat exchange efficiency, and also reduce more than 80% of the maintenance time.