石灰石-石膏法脱硫系统简介.doc

0.1Plant description 脱硫岛介绍 The FGD plant consists of flue gas path, which includes the absorber vessel, booster fan, GGH and bypass dampers, which ensure the operation of the boiler in two modes – FGD operation and a bypass operation. Limestone slurry preparation system gets ready the absorbent needed in the process. The only by-product is gypsum slurry, which is transported to the dewatering system consisting primary and secondary dewatering stages. Gypsum, as a byproduct of dewatering is temporary storied for further use and water is partly led back to the process, partly to the waste water treatment. 脱硫岛包括烟气系统、石灰浆液制备系统、石膏浆液脱水系统、石膏库和废水处理等。在烟气系统中包括吸收塔、升压风机和旁路档板，旁路档板的作用是它能够满足锅炉在两种模式下运行，一是在脱硫岛在线，二是脱硫岛旁路。石灰浆液制备系统的功能是准备工艺流程中所需的吸收剂。反应后生成的唯一的辅产品是石膏浆液，石膏浆液分别经过一级脱水和二级脱水，经过脱水产生的辅产品是石膏被临时储存起来为以后用，脱出的水一部分返回系统中，而另一部分被送到废水处理站。 0.1.1 Absorber system 吸收塔系统 A wet limestone process with forced oxidation with the SO2 absorber system is used to remove flue gas SO2 and to produce a gypsum by-product. SO2 removal efficiency of 96% is reached for all specified boiler loads and scope of the fuels. The absorber utilizes a perforated scrubber tray and four absorber spray levels for SO2 removal, which are above the absorber tray. The absorber recirculation pumps feed separately each header when operating. 在吸收塔中，湿石灰石与氧化风机鼓送的氧气和吸收塔中的二氧化硫发生反应，达到了除掉烟气中的二氧化硫的目的，并且产生了唯一的辅产品石膏。在指定的所有锅炉负荷和燃料范围内，二氧化硫除去率能达到96%。吸收塔装备有穿孔的托盘和四个喷淋层。为了便于二氧化硫的去除，喷淋层都安装在托盘的上方。在运行时，吸收塔浆液循环泵分别为每一个联箱提供浆液。 The SO2 removal process starts as the hot flue gas entering the absorber is cooled and saturated by the slurry falling from the absorption zone. The flue gas then flows through the absorber tray. The absorber tray helps the re-distribution of the flue gas to optimize the contact between the gas and the absorber. As the gas passes through the layer of scrubber slurry on the tray, the increased gas velocity, caused by tray perforations, generates a violent frothing action, thereby assuring spray zones, where absorber slur