The problem of acid rain is still severity , in the fossil power plant , the flue gas desulfurization is the main approach on controlling the let of so2 . the paper mostly introduce the dcs rebuilding project of the desulfurization system in . the equipment is first introduced into our country from mitsubishi corporation , which is the wet limestone - gypsum flue gas desulfurization equipment 火电厂烟气脱硫是控制so _ 2排放的主要途径。本文主要介绍华能珞璜电厂脱硫系统的dcs改造工程。该装置是国内首家引进的日本三菱重工公司湿式石灰石石膏法烟气脱硫装置。
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。
The results showed that the reducing organic acid solution include oxalic acid which were generated in the reaction liquid caused the corrosion of the titanium pressure - relief valve , which mostly because the feed solution in the 1 ( superscript # ) desulfurizing unit were mixed with the waste water discharged by 2 ( superscript # ) desulfurizing unit right after the time when the inhibitor were stopped being used anymore 结果表明，由于二脱硫装置停用缓蚀剂后排出的废水混入一脱硫装置的原料液中，进而使反应液中形成了草酸等还原性有机酸溶液，最终造成钛制减压阀发生腐蚀。
