煤化工企业尾气回收利用改造

Tail Gas Recovery and Utilization in Coal Chemical Plant

某企业石灰窑装置原设计利用电石炉尾气煅烧石灰,由于电石炉设计瓶颈,无法满负荷生产,通过引入天然气保证石灰窑正常生产,造成能耗增加。同时该企业拥有一套变压吸附提纯CO装置和两套变压吸附提纯H2装置,其尾气原设计通过火炬燃烧排放,造成资源浪费。通过回收变压吸附尾气用于石灰窑煅烧石灰,停止天然气使用,解决了电石炉瓶颈问题,提升了电石炉负荷,降低了能耗,多余电石炉尾气可用于生产CO,还可以加工成醋酸等高附加值化工产品,经济效益显著,而且达到了节能减排的目的。

The lime kiln in a coal chemical plant was originally designed to utilize tail gas from calcium carbide furnace to calcine lime. However, due to the design bottleneck of the calcium carbide furnace, the calcium carbide furnace failed to run at full load, and additional natural gas was needed to keep it running normally, resulting in increased energy consumption. Meanwhile, the coal chemical plant has a set of pressure swing adsorption (PSA) CO purification and two sets of PSA H2 purification, in which, according to the original design, tail gases were discharged to flare system, resulting in waste of resources. By recovering PSA tail gas for calcining lime in lime kiln and stopping the use of natural gas, the bottleneck problem of calcium carbide furnace has been eliminated, with operating load lifted and energy use reduced. The excess tail gas from calcium carbide furnace can be used to produce CO and high value-added chemical products such as acetic acid. All these have achieved significant economic benefit, energy saving and emission reduction.