本文選題：脫硫廢水　切入點(diǎn)：液滴蒸發(fā)　出處：《西安建筑科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國火電建設(shè)力度的加大和環(huán)保要求的提高,火電廠煙氣排放中二氧化硫的治理工作將更加深入。濕法脫硫工藝作為煙氣脫硫的主導(dǎo)工藝被廣泛采用,其比例已占到脫硫裝機(jī)總?cè)萘康?4%,目前世界上技術(shù)最成熟的脫硫工藝是最具優(yōu)勢的石灰石--石膏法。在濕式石灰石洗滌煙氣脫硫工藝中,煙氣中的氯化物會溶解,使得脫硫洗滌液中氯離子的濃度增加,而氯離子濃度的增加會引起脫硫率下降,并影響石膏品質(zhì)。為了解決這一問題,通常從脫硫工藝系統(tǒng)中排出一定量的廢水并補(bǔ)充新鮮吸收液來降低吸收劑中氯離子的濃度,排出的這部分廢水就是脫硫廢水。脫硫廢水中含有大量的氯離子、氟化物、亞硝酸鹽等;重金屬離子,如:銅、汞離子等;不可溶的硫酸鈣及細(xì)塵等。針對廢水成分特點(diǎn),廢水處理工藝主要采用石灰中和、絮凝澄清處理,但為去除一些金屬離子需加入特殊的鐵絡(luò)合物和聚合物藥品作為輔助絮凝劑,采用化學(xué)方法處理后的廢水中氯離子含量高,導(dǎo)致處理后的廢水無法進(jìn)入系統(tǒng)回用,而且根據(jù)國家環(huán)保要求脫硫廢水不允許排放。基于脫硫廢水難處理的問題,近年來發(fā)展的以液滴蒸發(fā)進(jìn)行廢水處理的工業(yè)應(yīng)用嶄露頭角,它是將廢水霧化噴入空氣預(yù)熱器和電除塵器之間的煙道,利用熱煙氣把廢水蒸發(fā),廢水中的可溶性固形物轉(zhuǎn)化為結(jié)晶鹽類固體,連同廢水中的顆粒物,經(jīng)過PCD裝置(顆粒物控制裝置)與飛灰一起被收集從而實(shí)現(xiàn)廢水的零排放。本文主要對廢水在煙道中的蒸發(fā)條件進(jìn)行計算,分析煙道廢水蒸發(fā)對除塵器及脫硫的影響。
[Abstract]:With the increase of thermal power construction and the improvement of environmental protection requirements, the treatment of sulfur dioxide in flue gas emissions from thermal power plants will be further deepened. The wet desulfurization process is widely used as the leading technology of flue gas desulfurization. At present, the most mature desulfurization technology in the world is the most advantageous limestone gypsum process. In the wet limestone washing flue gas desulfurization process, the chloride in the flue gas will dissolve. In order to solve this problem, the concentration of chlorine ion in desulfurization washing solution is increased, and the concentration of chlorine ion will cause the decrease of desulphurization rate and affect the quality of gypsum. A certain amount of waste water is usually discharged from the desulfurization process system and fresh absorbent solution is added to reduce the concentration of chlorine ion in the absorbent. This part of the waste water is the desulfurization wastewater, which contains a lot of chlorine ions, fluoride, etc. Nitrite and so on; heavy metal ions, such as copper and mercury ions; insoluble calcium sulfate and fine dust, etc. According to the characteristics of wastewater composition, the wastewater treatment process mainly adopts lime neutralization, flocculation clarification, etc. However, in order to remove some metal ions, special iron complexes and polymer drugs should be added as auxiliary flocculants. The wastewater treated by chemical method has high chlorine ion content, and the treated wastewater cannot be reused in the system. In addition, according to the national environmental protection requirements, desulphurization wastewater is not allowed to be discharged. Due to the difficult treatment of desulphurization wastewater, the industrial application of droplet evaporation for wastewater treatment has emerged in recent years. It is to spray the waste water into the flue between the air preheater and the electrostatic precipitator. The waste water is evaporated by hot flue gas, and the soluble solids in the wastewater are converted into crystalline salt solids, together with the particles in the wastewater. The zero discharge of waste water was realized by PCD device (particle control device) and fly ash. The evaporation conditions of waste water in flue were calculated and the influence of evaporation on dust collector and desulfurization was analyzed.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X773

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