关键词: 大型炼油厂, 硫回收装置, 硫磺, 硫酸, 组合工艺

Abstract: Take a 10 MM TPY refining-petrochemical integration project as an example, in which the acid gas treatment capacity is 184,400 TPY (calculated by sulfur), the planned sulfur recovery unit and the selected process technology route are comprehensively compared. The characteristics and advantages of each project are described in terms of investment, land occupation, utilities consumption, energy consumption, economic benefits and three wastes discharge. The results show that with different sulfur recovery process routes, the total sulfur recovery can reach more than 99.95%, which can meet the environmental protection requirements during start-up and shutdown and feedstock fluctuation at the same time; the steam output of 3.5 MPa can reach 182 t/h, which can be used as the main supplementary source of steam balance in the refinery; the annual output value of sulfuric acid unit can reach twice that of sulfur unit, with considerable economic benefits, but the investment of sulfuric acid unit is higher than that of sulfur unit. Through comprehensive comparison, the planned sulfuric acid unit has obvious advantages over the sulfur unit. However, the enterprise should comprehensively consider its own product structure, investment level, surrounding sulfuric acid market capacity and other factors to plan an appropriate sulfur recovery unit.

Key words: large refinery, sulfur recovery unit, sulfur, sulfuric acid, combination process