Abstract: The production energy consumption of the 200 kt/a sulfuric acid alkylation unit of Sinopec Henan Refining & Chemical Co.,Ltd.was analyzed, and corresponding energy-saving and consumption-reducing measures were proposed for the problems of high energy consumption of 3.5 MPa steam, 1.0 MPa steam and electricity of the unit. By optimizing the rotational speed of the compressor, the heat exchange processes of the dehydrocarbon tower and the deisobutane tower, the consumption of 3.5 MPa steam and 1.0 MPa steam was saved by 13.2 t/h and 6.6 t/h, respectively, and the cumulative energy consumption of 3.5MPa and 1.0 MPa steam was reduced by 3310.56 MJ/t, a total of 35325800 yuan was saved in steam costs per year. By optimizing the frequency conversion of the acid circulation pump and the hydrocarbon circulation pump, the electricity consumption can be saved by 56.0 kW.h and 22.1 kW.h per hour,respectively, resultting in annual electricity cost savings amount to 478900 yuan. By optimizing the number and duration of operation for 32 fans above 9 air coolers, the annual electricity consumption and cost savings were 1374474 kW.h and 893400 yuan, respectively. By optimizing the start-up frequency and duration of the fresh alkali liquid pump with high-speed intermittent operation, the cumulative electricity consumption and electricity cost saved throughout the year were 3836 kW.h and 2700 yuan, respectively.Then, when the optimization of power consumption was carried out, through the implementation of the above three types of power-saving measures, the cumulative annual electricity consumption can be saved by 2062466 kW.h, the cumulative electricity energy consumption can be reduced by 108.06 MJ/t, and the total electricity cost saved was 137500 yuan per year.That was to say, through the implementation of the above 3.5MPa and 1.0 MPa steam and electricity energy-saving measures, the device had cumulatively reduced energy consumption by 3418.62 MJ/t, creating an annual benefit of 36700800 yuan, and providing a basis and support for further energy conservation and consumption reduction of the device.

Key words: alkylation catalyzed by sulfuric acid, 3.5MPa steam, 1.0MPa steam, electricity, energy conservation and consumption reduction