The main works have been done as follow : ( 1 ) after a great deal of literatures are read , the paper introduces the main ways of the flue gas desulfurization , and the development status of dcs ; ( 2 ) through the analysis of the former dcs system in the plant , the desire about the rebuilding of dcs is put ; the characteristic of the planning dcs system is introduced ; ( 3 ) according to the characteristic of the wet limestone - gypsum flue gas desulfurization , the main factor about influencing the efficiency of desulfurization is analyzed ; ( 4 ) some tests are done , which are the reduction and enhancement of the flue gas quantity , and the disturbing test of the starting and stoping the circulation of the serum in the absorbing tower . the paper lists some actual run curves 本文完成了以下主要工作：在阅读了大量文献资料的基础上，介绍了火电厂烟气脱硫的主要方法，以及dcs的发展状况；通过对本厂脱硫装置原有dcs系统的分析，提出了对dcs改造的要求；介绍了拟选择dcs的特点；根据湿式石灰石石膏法烟气脱硫的特点，分析了影响系统脱硫效率的主要因素；进行了吸收塔烟气量减少、增加，启停吸收塔浆液循环泵扰动试验，并给出了部分实际运行曲线。
