关键词: 烷基化装置, 再生酸浓度, 干气氢含量, 硫元素损失, 静电除雾器, 丙烷, 铂金催化剂, 液态硫磺

Abstract:

A 20,000 TPY waste acid regeneration unit of a 200,000 TPY alkylation plant has some problems such as high acid consumption, difficult balance of new and old acid inventory, and serious corrosion due to the low concentration of regenerated acid(98% of the design mass fraction, only 96.6% of the actual value). By analyzing the influence factors such as hydrogen content of dry gas of incinerator fuel, sulfur element loss, and the effect of electrostatic precipitator to remove water vapor, many methods are adopted such as changing the incinerator fuel to propane with purity above 99%, adjusting the loading ratio of platinum catalyst in the first reactor of waste acid regeneration, increasing the liquid sulfur combustion system, reforming the high-temperature electrostatic precipitator, and optimizing the operation. The acid mass fraction of the new acid increased to nearly 98%. Then, the corrosion of equipment, pipelines and instruments is reduced, acid consumption is reduced, the inventory of old and new acid is balanced, thus ensuring safe, stable and long-term operation of the alkylation unit.

Key words: alkylation unit, concentration of regenerated acid, hydrogen content of dry gas, sulfur element loss, electrostatic mist eliminator, propane, platinum catalyst, liquid sulfur