Abstract: The poor quality and varied grades of asfired coal may cause the mass fraction of the sulfur to be much higher than the designed value, which will lead to the desulphurization equipments irregular operating and even to be damaged. In order to raise the adaptability of the desulphurization system for various coal grades, and satisfy the emission requirement of relevant standard when the highsulfur coal is fired, the capacity increasing reformation of the desulphurization system is necessary. The selection and optimization of the reformation technique scheme for the desulphurization system in Huadian Xinxiang Power Generation Corporation Limited were introduced, and the operation effects and the efficiency of the system after reformation were analyzed.

Key words: desulphurization system, desulphurization efficiency, capacity increasing reformation, optimization, operation effect