摘要
某炼油厂的制氢装置,原设计将中温中变气用于加热除氧水,不但造成能量浪费,而且造成后部的空冷和水冷负荷过大,严重时影响PSA系统的稳定运行。通过对装置现有流程的分析,确立了余热回收技术改造方案:增加一个蒸汽发生器,利用中变气的过剩热量产生0.6 MPa蒸汽供其它装置使用。项目改造后节能效果显著,在装置正常生产负荷下,能够产生0.6 MPa蒸汽10 t/h左右,同时空冷入口温度也由改造前的170℃降低至改造后的130℃,使制氢装置每吨氢气的能耗降低6 963.90 M J,同时降低了制氢PSA装置因夏季入口气体温度高而停车的事故危险。该技术改造在实现较好节能效果的同时,提高了装置运行的可靠性。
In the hydrogen manufacture plant of a refinery, the medium-temperature shift gas was utilized for heating deaerated water in the original design. This not only wasted energy, but also increased the cooling load of after air coolers and water coolers, which affected the stable operation of PSA systems. Through the analysis of process flow of existing unit, a waste heat recovery process was developed, i.e. the addition of a steam generator and utilization of excess heat from shift gas to produce 0.6 MPa steam for use of other units and facilities. After revamping, a significant amount of energy was saved. The unit, at normal operation capacity, was able to produce 10 t/h of 0.6 MPa steam, and at the same time, the inlet temperature of air cooler was reduced to 130℃ from 170℃ after revamping. As the result, the energy consumption of hydrogen manufacture plant was reduced by 6 963.90 MJ per ton of H2. In addition, the risk of unscheduled shutdown of the unit due to the high inlet gas temperature of PSA unit was mitigated. The revamping is a successful, which has saved the energy and improved the unit operation reliability.
出处
《炼油技术与工程》
CAS
2009年第5期55-57,共3页
Petroleum Refinery Engineering
关键词
制氢装置
余热回收
技术改造
hydrogen manufacture plant, waste heat recovery, revamp
