本文選題：陽極板 + 粉塵層�。� 參考：《浙江大學》2017年碩士論文

【摘要】：目前,燃煤電廠鍋爐尾氣中細顆粒物的脫除主要采用靜電除塵器。影響電除塵器收塵效率的主要因素是氣流分布不均、離子風、振打等引起嚴重的二次揚塵。其中振打引起的二次揚塵最高可占電除塵器出口總排放濃度的90%。故降低振打時二次揚塵對提高除塵器收塵效率具有重大意義。電除塵器振打的研究主要集中在上世紀70、80年代,且研究方向主要集中在最小振打加速度、振打時的清灰效果和振打加速度的傳遞,鮮有研究粉塵層剝離過程的報道。為了研究不同條件下電除塵器陽極振打時粉塵層的剝離過程,設計了閉循環(huán)實驗平臺。用相機拍攝振打時粉塵層在陽極板上的剝離過程并用ELPI測試電除塵器出口濃度,確定最佳振打加速度和最佳振打粉塵層厚度,為工業(yè)應用中振打參數的設置提供依據。實驗時測試不同條件下電除塵器的伏安特性曲線,實驗表明:異極距越小,起暈電壓越低,伏安特性曲線越陡;陽極板上粉塵層增厚會使電暈電流減小;粉塵層比電阻越大電流越小。此外,還對振打加速度進行標定,得到本實驗裝置振打加速度與振打高度的標準曲線。設置一系列的對照實驗,研究振打時粉塵層的剝離過程,并探索剝離率和二次揚塵與粉塵層厚度、振打加速度、粉塵比電阻、振打時運行電壓、收塵時運行電壓的關系。結果表明:振打時粉塵層脫離陽極板時有顆粒狀和團狀,顆粒狀會形成嚴重的二次揚塵隨氣流一起排出。就減少振打時二次揚塵而言,帶電振打明顯優(yōu)于斷電振打。此外,實驗中還發(fā)現(xiàn)二次揚塵與剝離率呈正相關關系。對陽極板上粉塵顆粒和粉塵層進行受力分析,得出粉塵層脫離陽極板理論上需要的臨界振打力,并分析理論公式難以應用的原因。擬合出不同條件下振打加速度與剝離率的關系,并求出剝離率為90%時的振打加速度,得到振打加速度與粉塵層厚度、振打時運行電壓、比電阻的關系式。
[Abstract]:At present, electrostatic precipitator is used to remove fine particles from boiler tail gas of coal-fired power plant. The main factors affecting the dust collection efficiency of ESP are the uneven distribution of air flow, ion wind, vibration and other serious secondary dust. The secondary dust caused by vibration can account for 90% of the total discharge concentration at the outlet of the electrostatic precipitator. Therefore, it is of great significance to reduce the secondary hoisting dust during vibration beating to improve the dust collection efficiency of the dust collector. The research on the vibration of electrostatic precipitator is mainly focused in the 1970s and 1980s, and the research direction is mainly focused on the minimum vibration acceleration, the dust removal effect and the transmission of the vibration acceleration. There are few reports on the process of dust layer stripping. In order to study the stripping process of dust layer during anodic vibration of electrostatic precipitator under different conditions, a closed cycle experimental platform was designed. The peel process of dust layer on the anode plate was photographed by camera and the outlet concentration of ESP was measured by ELPI to determine the optimum vibration acceleration and the optimum thickness of the dust layer, which provided the basis for setting the vibration parameters in industrial application. The volt-ampere characteristic curves of the electrostatic precipitator under different conditions were measured in the experiment. The results show that the smaller the distance between the different poles, the lower the corona voltage, the steeper the volt-ampere characteristic curve, the thicker the dust layer on the anode plate, the less the corona current. The larger the dust layer resistance, the smaller the current. In addition, the standard curve of vibration acceleration and height was obtained by calibrating the vibration acceleration. A series of controlled experiments were carried out to study the stripping process of dust layer during vibration beating, and to explore the relationship between the stripping rate and the thickness of dust layer, the vibration acceleration, the specific resistance of dust, the operating voltage during vibration beating and the operating voltage during dust collection. The results show that when the dust layer breaks away from the anode plate, there are granular and mass shapes, and serious secondary dusts will be discharged along with the air flow. In terms of reducing secondary dusts, electrified vibration is better than power off. In addition, a positive correlation was found between the secondary dust and the stripping rate. By analyzing the force of dust particles and dust layer on anode plate, the critical vibration force of dust layer is obtained, and the reason why the theoretical formula is difficult to be applied is analyzed. The relation between vibration acceleration and stripping rate under different conditions is obtained, and the relation between vibration acceleration and dust layer thickness, operation voltage and specific resistance is obtained when peeling rate is 90.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X773

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本文編號：2099425