發(fā)布時(shí)間：2018-06-06 14:43

  本文選題：脫硫廢水 + 預(yù)處理��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：目前國內(nèi)大容量燃煤發(fā)電機(jī)組大多配備濕式煙氣脫硫裝置,濕法脫硫工藝在對煙氣脫硫的同時(shí)也會(huì)產(chǎn)生大量的脫硫廢水。所以研發(fā)具有針對性的廢水綜合回用技術(shù),并對其實(shí)際應(yīng)用效應(yīng)進(jìn)行評判是必要的。結(jié)合目前脫硫廢水回用技術(shù)應(yīng)用現(xiàn)狀,在廢水水質(zhì)分析的基礎(chǔ)上,進(jìn)行了預(yù)處理、膜濃縮和蒸發(fā)結(jié)晶實(shí)驗(yàn)研究,并采用預(yù)處理+石膏晶種法MVR蒸發(fā)結(jié)晶工藝對脫硫廢水進(jìn)行了現(xiàn)場工程實(shí)驗(yàn)研究。通過比對篩選得出:該廠脫硫廢水投加氫氧化鈣和硫酸鈉量依次為13.7g/L、6.0g/L,p H達(dá)到12.5,處理后的水質(zhì)符合石膏晶種法蒸發(fā)結(jié)晶進(jìn)水水質(zhì)要求;DTRO(碟管式反滲透)操作壓力較高,在75bar的操作壓力下,濃水TDS可達(dá)到100000mg/L,產(chǎn)水TDS在1200-1300mg/L;在預(yù)處理+石膏晶種法MVR蒸發(fā)結(jié)晶工藝中試實(shí)驗(yàn)中,驗(yàn)證了石膏晶種法MVR蒸發(fā)結(jié)晶工藝處理脫硫廢水的可行性,在“鹽腿淘洗+外排母液”的協(xié)調(diào)作用下,可以達(dá)到外排石膏和氯化鈉鹽的分離,外排結(jié)晶鹽(氯化鈉)為純白色晶體,各項(xiàng)指標(biāo)均滿足工業(yè)鹽優(yōu)級(jí)標(biāo)準(zhǔn),外排二次冷凝水滿足回用標(biāo)準(zhǔn)。根據(jù)工藝路線比選,針對不同工程需求,可選取適當(dāng)處理工藝,實(shí)現(xiàn)廢水大量回用、少排放或者“零排放”。脫硫廢水回用技術(shù)在燃煤電廠和煤化工行業(yè)具有十分廣闊的應(yīng)用前景。在蒸發(fā)結(jié)晶工藝中,應(yīng)深入研發(fā)結(jié)晶鹽提純技術(shù),可作為工業(yè)鹽產(chǎn)生經(jīng)濟(jì)效益。經(jīng)濟(jì)可靠的廢水回用工藝既有利于工業(yè)廢水的處理,又可產(chǎn)生較好的環(huán)境效益、經(jīng)濟(jì)效益和社會(huì)效益。
[Abstract]:At present, most large capacity coal-fired generating units in China are equipped with wet flue gas desulfurization (WFGD) devices, and a large amount of desulfurization wastewater will be produced by wet desulfurization process. Therefore, it is necessary to develop a comprehensive reuse technology for wastewater and evaluate its practical application effect. Based on the analysis of wastewater quality, pretreatment, membrane concentration and evaporation crystallization experiments were carried out on the basis of the present application of desulfurization wastewater reuse technology. The field engineering experiment of desulphurization wastewater was carried out by pretreatment gypsum crystal seed MVR evaporation crystallization process. Through comparison and screening, it is concluded that the dosage of calcium hydroxide and sodium sulfate in desulphurization wastewater of this plant is 13.7g / L ~ (-1) L ~ (-1) 路L ~ (-1) 路L ~ (-1) H is 12.5.After treatment, the water quality accords with the water quality requirement of gypsum crystal seed evaporative crystallization influent water quality and the operation pressure of DTRO-type reverse osmosis is higher. Under the operating pressure of 75bar, the TDS of concentrated water can reach 1000 mg / L, the TDS of producing water is 1200-1300 mg / L, the feasibility of treating desulfurization wastewater by MVR evaporation crystallization process of gypsum crystal seed is verified in the pilot-scale experiment of MVR evaporation crystallization process with pre-treated gypsum crystal seed method. Under the coordinated action of "salt leg washing out mother liquor", the separation of gypsum and sodium chloride can be achieved. The outer discharge crystal salt (sodium chloride) is a pure white crystal, and each index meets the standard of industrial salt quality. The secondary condensed water discharged out meets the reuse standard. According to the comparison and selection of the process route, according to the different engineering requirements, the appropriate treatment process can be selected to realize a large amount of waste water reuse, less discharge or "zero discharge". Desulphurization wastewater reuse technology has a very broad application prospect in coal-fired power plant and coal chemical industry. In the process of evaporation and crystallization, the purification technology of crystalline salt should be developed deeply, which can be used as industrial salt to produce economic benefits. The economical and reliable wastewater reuse process is not only beneficial to the treatment of industrial wastewater, but also can produce better environmental, economic and social benefits.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X773

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本文編號(hào)：1986994