大型炼厂气变压吸附(PSA)提氢装置的优化改造

某炼厂气变压吸附(PSA)提纯氢气装置吸附剂寿命短、吸附性能差、产品氢气纯度和氢气回收率低,故障自动诊断切塔专家系统设计有缺陷造成吸附塔压力大幅波动。通过更换全部吸附剂,提高产品氢气纯度和氢气回收率;通过更换故障自动诊断处理专家系统,消除装置故障切塔过程中的非正常压力波动,提升装置安全性;通过更换自适应优化控制系统,装置产品质量控制更稳定,提升装置运行经济性。改造获得了良好的效果,年增产高质量氢气产品超过1000万Nm^3,改造后运行3年装置的各项操作指标均没有下降。

Revamp and optimization of a large PSA unit for purification of hydrogen from refinery off-gases

There existed many problems in a pressure swing adsorption(PSA) unit for purification of hydrogen from refinery off-gases, such as short life and poor adsorption performance of the adsorbents, low product purity and recovery of hydrogen, and large fluctuation of adsorber pressure caused by the design defects in the automatic fault diagnosis and adsorber cut-out expert system. In order to solve the above problems, this PSA unit was revamped. All adsorbents were hreplaced so as to improve the product purity and the recovery of hydrogen;the automatic fault diagnosis and treatment expert system were replaced so as to eliminate the abnormal pressure fluctuation during adsorber cutt-out and improve the safety of the unit;the adaptive optimization control system was replaced so as to obtain more stable product quality control and better operation economy. This revamp has achieved good results. The annual production of high-quality hydrogen products has increased by more than 10 million cubic meters, and the operation indexes have not declined in the three years since the revamp.