發(fā)布時(shí)間：2019-05-16 11:00

【摘要】：隨著環(huán)保要求的不斷提高,燃煤電廠面臨著廢水難以達(dá)標(biāo)排放的壓力,因此必須尋求新的途徑解決電廠的實(shí)際問(wèn)題。目前適用于燃煤電廠高含鹽廢水處理的技術(shù)除常規(guī)的三聯(lián)箱工藝外,還有兩級(jí)澄清軟化工藝、膜處理技術(shù)、熱法處理技術(shù)等工藝。本論文主要針對(duì)燃煤電廠高含鹽廢水水質(zhì)特點(diǎn),優(yōu)先考察了濕式撈渣機(jī)系統(tǒng)利用的可行性和適用性,然后研究了高壓反滲透技術(shù)、正滲透技術(shù)在處理脫硫廢水方面技術(shù)的適用性及經(jīng)濟(jì)的可行性。為了降低費(fèi)用,國(guó)內(nèi)部分電廠利用濕式撈渣機(jī)來(lái)消耗脫硫廢水,本論文對(duì)該方案的可行性進(jìn)行了論證,并針對(duì)現(xiàn)場(chǎng)試驗(yàn)過(guò)程中發(fā)現(xiàn)的問(wèn)題提出了應(yīng)對(duì)措施。為了考察脫硫廢水引入撈渣機(jī)后對(duì)鍋爐本體的影響,搭建實(shí)驗(yàn)室模擬平臺(tái)進(jìn)行了相應(yīng)的試驗(yàn)驗(yàn)證,分析了脫硫廢水引入渣系統(tǒng)的蒸汽成份對(duì)燃燒系統(tǒng)的影響行為。結(jié)果表明采用濕除渣系統(tǒng)的電廠在嚴(yán)格控制水量的前提下可以有效利用濕式撈渣機(jī)來(lái)消耗高含鹽廢水,從而減輕后續(xù)處理的壓力。正滲透技術(shù)在國(guó)外的垃圾滲濾液處理方面已得到了很好的應(yīng)用,在處理燃煤電廠高含鹽廢水方面實(shí)際應(yīng)用案例較少,目前在國(guó)內(nèi)已有正滲透技術(shù)處理脫硫廢水的案例,但由于運(yùn)行時(shí)間較短,對(duì)該技術(shù)的工程應(yīng)用情況還需要深入的研究。研究結(jié)果表明當(dāng)正滲透系統(tǒng)進(jìn)水含鹽量(TDS)在41000mg/L左右時(shí),一級(jí)兩段MBC系統(tǒng)濃縮倍數(shù)約為4-4.5,濃水經(jīng)汽提后含鹽量在180000-200000mg/l之間,同時(shí),試驗(yàn)運(yùn)行期間正滲透膜組件沒有發(fā)現(xiàn)污堵和結(jié)垢跡象。反滲透技術(shù)在水處理領(lǐng)域也有多年的成果應(yīng)用案例,憑借其寬流道結(jié)構(gòu)及能有效減緩物理堵塞等獨(dú)特性能,在處理燃煤電廠高含鹽廢水方面也呈現(xiàn)潛在優(yōu)勢(shì)。實(shí)驗(yàn)結(jié)果高壓反滲透組件可以選擇75bar、150bar和200bar三個(gè)等級(jí)的操作壓力,在濃縮倍數(shù)高的應(yīng)用中,其含固量可以達(dá)到30%以上。結(jié)合正滲透和反滲透的優(yōu)勢(shì),提出兩者有機(jī)結(jié)合降低系統(tǒng)能耗提高膜技術(shù)在處理燃煤電廠高含鹽廢水領(lǐng)域的技術(shù)方案。
[Abstract]:With the continuous improvement of environmental protection requirements, coal-fired power plants are facing the pressure that it is difficult to meet the discharge of wastewater, so we must find new ways to solve the practical problems of power plants. At present, the technologies suitable for the treatment of high salt wastewater in coal-fired power plants are not only the conventional triple-box process, but also the two-stage clarification and softening process, membrane treatment technology, thermal treatment technology and so on. In this paper, according to the water quality characteristics of high salt wastewater in coal-fired power plant, the feasibility and applicability of wet slag fishing machine system are investigated, and then the high pressure reverse osmosis technology is studied. The applicability and economic feasibility of positive osmosis technology in desulphurization wastewater treatment. In order to reduce the cost, some domestic power plants use wet slag fishing machine to consume desulphurization wastewater. The feasibility of this scheme is demonstrated in this paper, and the countermeasures are put forward in view of the problems found in the field test. In order to investigate the influence of desulphurization wastewater on boiler body after desulphurization wastewater was introduced into slag fishing machine, the corresponding experimental verification was carried out on the laboratory simulation platform, and the influence behavior of steam composition of desulphurization wastewater slag introduction system on combustion system was analyzed. The results show that the power plant with wet slag removal system can effectively use wet slag fishing machine to consume high salt wastewater under the premise of strict control of water quantity, so as to reduce the pressure of subsequent treatment. Positive osmosis technology has been well applied in the treatment of landfill leachate in foreign countries, and there are few practical application cases in the treatment of high salt wastewater from coal-fired power plants. At present, there are cases of desulphurization wastewater treatment by positive osmosis technology in China. However, due to the short running time, the engineering application of this technology still needs to be deeply studied. The results show that when the influent salt content (TDS) of the positive osmotic system is about 41000mg/L, the concentration multiple of the first stage two-stage MBC system is about 4 鈮，

本文編號(hào)：2478239