从炼油厂全厂含氢干气中回收氢气方案探讨

RECOVER HYDROGEN FROM REFINERY DRY GAS

分析了中国石化海南炼油化工股份公司炼油厂的氢气平衡和含氢干气情况,探讨了从全厂含氢干气中回收氢气的技术方案。根据该厂氢气管网和设备情况,确定膜分离的操作压力为2.5MPa,膜分离产品氧压力为0.8 MPa或0.3 MPa两个压力等级,选择"VPSA(抽真空变压吸附分离技术)+膜分离"、膜分离处理全部含氢干气两种技术方案,进行运行成本、氢气回收率和投资比较。从比较结果看出,膜分离处理全部干气方案具有投资回收期短、运行费用低和氢气回收率高的特点,是该厂含氢干气利用的最佳方案。若采用该方案,制氢装置可以停止运行,全厂加工损失降低0.183%,全厂单位能耗降低46.90 MJ/t,同时全年减排二氧化碳82 kt,具有较好的经济效益和环保效益。

The hydrogen balance and availability of dry gas containing hydrogen in the refinery of SINOPEC Hainan Refining ＆ Chemical Co. , Ltd were analyzed, and the process for recovering hydrogen from H2- containing dry gas was studied. Based upon the conditions of hydrogen pipe network and equipment, the operating pressure of membrane separator was determined at 2.5 MPa and the pressure of separator hydrogen product at 0.8 or 0.3 MPa. VPSA ＋ membrane separation and membrane processes were selected for purification of hydrogen. The comparison of operating costs, project investment and hydrogen recovery rate of the two processes showed that membrane process was short in return of investment, low in operating cost and high in hydrogen recovery rate. It is a most feasible process for hydrogen recovery. If membrane unit is installed, the existing hydrogen generation plant can be shutdown. The operating loss of the refinery can be reduced by 0. 183% and unit energy consumption of the refinery is lowered by 46.90 MJ/t. The annual CO2 emission is reduced by 82,000 tons and good economic and environmental benefits can be achieved.