焦炉上升管中荒煤气余热回收的结焦问题研究

焦炉上升管中荒煤气焦油蒸汽的结焦问题一直是阻碍其余热回收的关键因素。因为荒煤气中的焦油蒸汽在高温条件下存在着缩合结焦反应,生成的结焦物石墨化,并附在换热表面,使传热系数下降,热回收难以长期有效进行下去。研究了荒煤气中焦油蒸汽结焦特性,研究结焦沉积物形成的条件及影响因素,有利于最大程度回收利用荒煤气余热,并防止荒煤气在上升管内冷却时结焦。

Analysis on problems of deposited graphite in ascension pipe of coke oven during coke-oven gas heat recovery

In ascension pipe of coke oven,the critical factor that seriously hinders the coke-oven gas heat recovery is that tar steam frequently tends to coke.Because under high temperature,the tar steam reacts condensation reaction,the graphitization of outcome is serious,the coking sediment attach to the heat exchange surface,which decreases the heat transfer coefficient and also make it difficult for long term and effective heat recovery.Investigate the cokability of tar steam in coke-oven gas,also study the formation conditions and influencing factors of coking sediments.The results show that,this study can help to most effectively recycle waste heat,prevent coke-oven gas coking in ascension pipe as it cools.