Abstract: This paper investigates the driving scheme of refrigeration compressor and the heat source scheme of reboiler in sulfuric acid alkylation unit. The results show that the reboiler uses heat conducting oil as heat source. The refinery has excessive low pressure steam in summer, the excessive 1.0 MPa steam is used as the heat source of reboiler, and the insufficient heat is provided by the heat conducting oil system. In winter, there is no surplus low pressure steam in the refinery, so all the heat required by the reboiler is provided by the heat conducting oil system. The refrigeration compressor is driven by motor (with gear box). This design scheme can reduce the energy consumption of alkylation unit and optimize the steam pipe network system and power balance of the refinery

Key words: alkylation, refrigeration compressor, reboiler, Utility optimization