本文關鍵詞：火電廠WESP細微顆粒物脫除特性分析與效率的數(shù)值模擬　出處：《上海電力學院》2016年碩士論文　論文類型：學位論文

  更多相關文章： 火電廠 濕式靜電除塵器 除塵效率 數(shù)值模擬

【摘要】：隨著社會的快速發(fā)展,經濟水平的不斷提升,我國用電負荷不斷上升,火電廠燃煤所導致的大氣污染隨之加重,特別是近年來頻繁出現(xiàn)的霧霾不斷引起社會公眾的廣泛關注。雖然干式靜電除塵器在火電廠的廣泛應用大大降低了顆粒物的總排放量,但是其對PM2.5、PM10等細微顆粒物的脫除效果并不理想。為滿足國家對顆粒物排放的新要求,濕式靜電除塵器(WESP)作為新型高效的除塵技術備受關注。本文對裝備有濕式靜電除塵器的典型660MW火電機組的顆粒物排放進行試驗,對比了有無配置WESP時火電廠細微顆粒物脫除效果,并針對其實際運行過程中不同煤種、不同負荷情況時進行顆粒物的特性分析,WESP對火電廠細微顆粒物脫除效果顯著,顆粒物排放濃度能夠維持在3mg/m3以下,滿足國家有關污染物排放標準的要求;WESP的顆粒物脫除效率與機組負荷和煤種都有一定的聯(lián)系,WESP除塵效率隨著負荷與煤種灰分含量的增加而降低;根據顆粒物排放特性的分析,WESP對30μm以下的細微顆粒物有著顯著的脫除效果。通過采用數(shù)值模擬的方法對濕式靜電除塵器細微顆粒脫除效率及其影響因素進行了研究。針對660MW機組WESP采用數(shù)值模擬計算的方法,構建濕式靜電除塵器數(shù)學模型,探究噴淋水霧、氣流速度、入口濃度、電勢電壓、噴淋水量等因素對細微顆粒物脫除效率的影響,得出:噴淋水對除塵效果的提升比較明顯;WESP除塵效率隨著氣流速度(0.5m/s-3.5m/s)的增大而不斷降低;當顆粒濃度(2mg/m3-300mg/m3)不斷增加,除塵效率先隨之增加,當大于30mg/m3然后基本保持平穩(wěn);除塵效率隨著電勢電壓(10k V-50kV)的增加而不斷提高;噴淋水量在0.05kg/s的條件下,WESP除塵效率可達到最高。同時對不同負荷條件下的WESP脫除情況進行模擬,結果與實際脫除情況對比,兩者變化規(guī)律基本一致。
[Abstract]:With the rapid development of society and the continuous improvement of economic level, the power load of our country is rising, and the air pollution caused by coal-fired power plants has become more and more serious. Especially the frequent appearance of haze in recent years has attracted the attention of the public. Although the wide use of dry electrostatic precipitators in thermal power plants has greatly reduced the total emissions of particulate matter, but its PM2.5. The removal effect of fine particles such as PM10 is not ideal. Wet electrostatic precipitator (WESP), as a new and efficient dust removal technology, has attracted much attention. In this paper, the emission of particulate matter from a typical 660MW thermal power unit equipped with a wet electrostatic precipitator is tested. The removal effect of fine particles in thermal power plant with or without WESP is compared, and the characteristics of particulate matter are analyzed according to different coal types and different loads in the actual operation process. The effect of WESP on the removal of fine particulate matter in thermal power plant is remarkable, and the emission concentration of particulate matter can be maintained below 3 mg / m3, which meets the requirements of the national emission standards for pollutants. The removal efficiency of particulate matter of WESP is related to the unit load and coal type. The dust removal efficiency of WESP decreases with the increase of load and ash content of coal. According to the analysis of particulates emission characteristics. WESP has remarkable effect on removing fine particles below 30 渭 m. The removal efficiency of fine particles of wet electrostatic precipitator (ESP) and its influencing factors are studied by means of numerical simulation. The WESP of 0MW unit is calculated by numerical simulation. The mathematical model of wet electrostatic precipitator was constructed to explore the effects of spray water mist, airflow velocity, inlet concentration, potential voltage, spray water and other factors on the removal efficiency of fine particles. It is concluded that the effect of spray water on dust removal is obvious. The dust removal efficiency of WESP decreases with the increase of gas velocity (0.5 m / s -3.5 m / s). When the particle concentration increased from 2 mg / m 3 to 300 mg / m 3), the dust removal efficiency increased first, and then remained stable when the particle concentration was greater than 30 mg / m 3. The dust removal efficiency increases with the increase of potential voltage (10k V-50kV). The dust removal efficiency can reach the highest under the condition of spraying water at 0.05 kg / s. At the same time, the WESP removal under different load conditions is simulated, and the results are compared with the actual removal situation. The law of change between the two is basically the same.
【學位授予單位】：上海電力學院
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM621.73

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