烟气脱硫后深度节水技术分析研究

发布时间：2018-05-31 07:30

本文选题：褐煤机组 + 湿法脱硫　；参考：《华北电力大学》2017年硕士论文

【摘要】：在中国北方地区,由于缺水原因,火电机组的发展受到了很大的限制,许多新建电厂由于用水指标紧缺,往往不得不采用投资大、运行成本高的干法脱硫系统。两台600MW机组干法脱硫系统初投资就达7-8亿元,而湿法脱硫系统只需1.2-1.5亿元。所以,研究火电厂湿法脱硫系统深度节水非常必要,具有巨大的应用背景。褐煤占中国煤炭储量的13%左右,储量巨大。而褐煤的突出特点是水分高(30-50%),这使得燃烧过程中水蒸汽吸收大量气化潜热,与其它煤相比,一次风率高、烟气量大、排烟热损失大、锅炉效率偏低。如果我们有效利用褐煤烟气含水量大的特点,研究褐煤机组湿法脱硫系统及后期烟气的深度节水,优化褐煤脱硫塔工况设计并在脱硫系统出口烟道中实现高水分烟气的深度凝结,这不仅会实现褐煤机组脱硫系统大幅度节水,还能回收燃烧过程中吸收的气化潜热,有希望较大幅度提高机组总体循环效率。所以,这项研究不仅具有巨大的应用背景还有重要的理论价值。
[Abstract]:In the north of China, the development of thermal power units is limited because of lack of water. Because of the shortage of water index, many new power plants often have to adopt dry desulfurization system with large investment and high operating cost. The initial investment of dry desulphurization system of two 600MW units is 7800 million yuan, while that of wet desulfurization system is 1.2-1.5 billion yuan. Therefore, it is necessary to study the deep water saving of wet desulfurization system in thermal power plant, and has a huge application background. Lignite accounts for about 13% of China's coal reserves, with huge reserves. The prominent feature of lignite is high moisture content 30-50%, which makes steam absorb a large amount of latent heat of gasification during combustion process. Compared with other coal, primary air ratio is higher, flue gas quantity is large, exhaust heat loss is large, boiler efficiency is low. If we effectively utilize the characteristics of high moisture content in lignite flue gas, we study the wet desulfurization system of lignite unit and the depth and water saving of flue gas in the later stage. Optimizing the design of lignite desulfurization tower and realizing the deep condensation of high-moisture flue gas in the flue gas outlet of the desulfurization system, this will not only realize the substantial water saving in the desulfurization system of lignite unit, but also recover the latent heat of gasification absorbed in the combustion process. Hopefully, the overall cycle efficiency of the unit will be greatly improved. Therefore, this research not only has the huge application background but also has the important theory value.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X773

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