本文選題：燃煤電廠 + 交流電場��； 參考：《上海電力學(xué)院》2014年碩士論文

【摘要】：微細(xì)粉塵嚴(yán)重危害人類健康和大氣環(huán)境，現(xiàn)階段燃煤電廠常用除塵技術(shù)對粉塵整體脫除效率較高，然而對1μm以下粒徑的粉塵粒子捕集能力較弱，電凝并作為一種粉塵預(yù)處理系統(tǒng)能有效的提高除塵器對微細(xì)粉塵的捕集效率。針對以上情況，本文研究了交流電壓條件下對粉塵荷電凝并及脫除效率的影響因素，并對600MW燃煤電廠粉塵排放特性及交流電壓下燃煤粉塵凝并脫除效率進(jìn)行了較為深入的探討，取得了以下成果： 1.介質(zhì)阻擋放電器（DBD）將粉塵荷電凝并過程合二為一，其優(yōu)點(diǎn)在于能使粉塵粒子在放電器中反復(fù)進(jìn)行荷電凝并，有利于提高凝并效率。在放電器后部加裝PPS（聚苯硫醚）過濾除塵器，在提高微細(xì)粉塵脫除效率的同時(shí)，縮短了除塵裝置的總長度，降低了成本。 2.通過改變影響粉塵粒子荷電凝并的條件，實(shí)驗(yàn)得出粉塵凝并效率隨電壓的升高而提高，最佳凝并頻率為120Hz，延長粉塵荷電凝并時(shí)間能有效的提高凝并效率。同時(shí)，粉塵性質(zhì)對凝并效率也有著一定的影響，粉塵介電常數(shù)越大，荷電能力越強(qiáng)，凝并效果越好。 3.通過實(shí)驗(yàn)得出PPS濾料存在最佳過濾風(fēng)速，為1.5m/s，粉塵脫除效率隨荷電凝并電壓升高而提高。粉塵性質(zhì)影響除塵效率，粉塵比電阻越小，，除塵效率越高，相對濕度在一定范圍內(nèi)越大，除塵效率相對較好。0.5μm的粉塵荷電凝并前后較粒徑為10μm粉塵脫除效率變化明顯，這說明靜電凝并-纖維脫除是一種有效的控制微細(xì)粉塵排放的方式。 4.600MW燃煤機(jī)組粉塵經(jīng)靜電除塵后以PM2.5為主，實(shí)驗(yàn)中所使用的靜電凝并-纖維過濾除塵技術(shù)是一種針對燃煤電廠粉塵的有效控制方法，在布袋除塵器前加裝電凝并裝置，調(diào)節(jié)過濾風(fēng)速1.5m/s，凝并電場頻率120Hz，荷電凝并電壓12kV，此時(shí)，除塵后0.3-0.5μm、0.5-1μm級別的粉塵粒子個(gè)數(shù)較無凝并條件下分別減小了14.1%和8.2%。這說明，電凝并能有效提高PPS濾料對燃煤電廠微細(xì)粉塵的脫除效率。
[Abstract]:Fine dust is a serious hazard to human health and atmospheric environment. At present, the dust removal technology used in coal-fired power plants is relatively high in overall dust removal efficiency, but the ability to capture dust particles with particle size less than 1 渭 m is relatively weak. As a dust pretreatment system, electrocoagulation can effectively improve the collecting efficiency of dust precipitator. In view of the above situation, this paper studies the factors that affect the efficiency of charged condensation and removal of dust under the condition of AC voltage, and probes into the dust emission characteristics of 600MW coal-fired power plant and the efficiency of coagulation and removal of coal-fired dust under AC voltage. The following results were achieved: 1. The dielectric barrier discharger (DBD) combines the charge condensation process of dust into one, and its advantage lies in the fact that the dust particles can be charged and condensed repeatedly in the discharger, which is helpful to improve the coagulation efficiency. The application of PPS (polyphenylene sulfide) filter in the rear of the discharge apparatus can improve the removal efficiency of fine dust at the same time shorten the total length of the dedusting device and reduce the cost. 2. By changing the conditions that affect the charged coagulation of dust particles, the experimental results show that the efficiency of dust coagulation increases with the increase of voltage, and the optimum coagulation frequency is 120 Hz, and prolonging the time of charged coagulation of dust particles can effectively improve the coagulation efficiency. At the same time, the properties of dust have a certain influence on the coagulation efficiency. The higher the dielectric constant of dust, the stronger the charge capacity and the better the coagulation effect. 3. The results show that the optimal filtration speed of PPS filter media is 1.5 m / s, and the dust removal efficiency increases with the increase of charged coagulation and voltage. The dust property affects the dust removal efficiency. The smaller the dust specific resistance, the higher the dust removal efficiency, the greater the relative humidity in a certain range, the better the dust removal efficiency is, the better the dust collection efficiency is, the better the dust removal efficiency is before and after the dust collection is 10 渭 m in particle size. This shows that electrostatic coagulation-fiber removal is an effective way to control the emission of fine dust. The dust of 4.600MW coal-fired unit is mainly controlled by PM2.5 after electrostatic dusting. The electrostatic coagulation-fiber filter dust removal technology used in the experiment is an effective control method for dust in coal-fired power plant, and the electric coagulation unit is installed in front of the bag dust collector. Adjusting filtering speed 1.5 m / s, coagulation and electric field frequency 120 Hz, charge-coagulation voltage 12 kV, at this time, the number of dust particles of 0.3-0.5 渭 m or 0.5 渭 m after dust removal is decreased by 14.1wt% and 8.2%, respectively, compared with those without coagulation. This shows that electrocoagulation can effectively improve the removal efficiency of fine dust from coal-fired power plants by PPS filter media.
【學(xué)位授予單位】：上海電力學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：X773

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