【作者】 王辉；

【导师】 陈英旭；

【作者基本信息】 浙江大学 ， 环境工程， 2009， 硕士

【摘要】 湿法烟气脱硫是一种相对成熟、脱硫效率较高的脱硫技术,近几年来在国内得到了广泛应用,同时也存在投资和运行费用高、腐蚀严重等缺陷。本课题针对传统喷淋空塔脱硫工艺中普遍存在的一些问题:如系统复杂、一次性投资大、塔单元吸收效率低、入口干湿界面腐蚀结垢严重等方面进行了机理分析研究,通过动态试验研究、大量的理论分析计算和工程应用研究相结合,在以下方面实现了集成创新:a.取消了传统湿法脱硫工艺中配置的气气换热器,对后续的烟道烟囱等设施进行防腐处理,极大地优化了系统的配置,降低一次性投资约15%,脱硫系统总运行阻力下降1500Pa以上,节能效果显著,并提高系统可靠性。b.在吸收塔内创新增设两层棒栅型专有装置,使烟气经过棒栅层的整流在塔截面上分布更均匀,并形成高效的初级湍流吸收区。设计有双核心吸收区域(二元吸收)的吸收塔,可明显提高塔的单元吸收效率,在达到相同脱硫效率下所需的液气比可下降15～25%,喷嘴数量和吸收塔浆池容积可减少20%左右。c.在吸收塔烟气入口段的上方设置了带倾角的翼板,入口烟道内增设有降温及清洁功能的预喷淋装置,可有效改善以一定倾角进入吸收塔的烟气因回流夹带浆流造成入口烟道腐蚀结垢现象的发生,提高了系统运行可靠性。d.对喷淋区的重要参数进行了研究,包括喷嘴型式、布置及喷淋层的优化设计,得出:宜选用入口压力0.7～0.8Bar的偏心喷嘴、喷淋层中间部分喷嘴采用120°喷淋角,边圈则由于雾沫携带宜选用90°的喷嘴,并考虑一定角度的偏转,以减少塔壁沟流液量、喷嘴的雾化粒径宜保持在2000μm～2500μm、喷淋层层数及层间距应综合考虑性能和经济的平衡。课题在拥有双核心吸收单元吸收塔的开发、实现净烟气低温排放系统技术的开发、系统的防结垢和防腐蚀等方面进行了系统集成创新,其创新成果在300MW机组烟气脱硫工程中得到验证并完善通过,实现了节能环保双重目的。同时为湿法脱硫技术的国产化提供了一些借鉴和启示。更多还原

【Abstract】 Lime/Limestone wet flue gas desulfurization(WFGD) technology with high desulfurization efficiency is being applied widely recent years in our country, which exist high capital cost and operation cost and serious corrosion. By analyzing and studying the problem of original WFGD such as complicated system, high capital cost, low efficiency of unit absorption, serious corrosion and scaling in dry/wet interface ,we draw the follow innovative conclusion by test study, theoretical analysis and project application research:a. By cancelling GGH and treating with preservatives for the following duct and stuck, the capital cost is reduced by 15% and the total pressure drop is reduced 1500Pa, it has better energy saving effect and reliability.b. By adding two layers of rods in the absorber, which makes flue gas distributes uniformly and forms primary turbulence zone, the absorber which have double absorption units can gain higher unit absorption efficiency , reduce L/G by 15% when gain equal desulfurization efficiency and reduce spraying nozzles by 20% and volume of sump by 20%.c. The wing plate with inclined angel equipped above absorber inlet and pre-spraying equipment located absorber inlet ,which can decrease the inlet temperature and clean duct, can improve the corrosion and scaling of absorber inlet duct because of the returning of flue gas and strengthen the security of the system.d. By researching important parameters in spraying zone concluding the style and arrangement of spraying and optimized design of spray layer, we can draw a conclusion that the inlet pressure of eccentric nozzle should be 0.7-0.8bar, the spraying angel of nozzles located centre of spraying zone should be 120, the nozzles located at the edge which defect a angle in order to decrease the flow along wall should be 90, the particle size of nozzle should be 2000μm～2500μm, the number of layer and distance of layer should balance enology and technology.In this article, the innovation achievement that the developing absorber which has two absorption units, the gas emitting of low temperature and the preventing corrosion and scaling of system are accomplished. This achievement is applied in 300MW power unit and realize energy saving and environmental protection. At the same time, the article provide an enlightenment of the nationalization of desulfurization system.更多还原