Objective The purpose is to reduce energy consumption of the sulfur recovery unit through technological transformation and optimization of operating parameters.

Methods (1) By analyzing the current energy consumption status of the unit, the technical transformation is adopted to solve the typical problems in energy saving and consumption reduction; (2) The quality of purified water is improved by optimizing stripping operation parameters.

Results The technical transformation has obtained the following Results: (1) Reducing the consumption of 1.2 MPa steam and 0.4 MPa steam in the device; (2) Effectively improving the comprehensive utilization rate of purified water, and reducing the consumption of production water and desalinated water as well as sewage discharge throughout the plant.

Conclusions After technological transformation, the comprehensive energy consumption of the unit has decreased from the original 1 000 kgEO/t to the current 660 kgEO/t, and the reuse rate of purified water has increased from the original 40.0% to the current 83.5%.