提高荷电粉尘粒子过滤除尘效率的机理研究
发布时间：2018-08-12 20:46
【摘要】：如今,我国工业化和城市化的进程日益加快,环境污染问题日趋严重。可吸入性烟粉尘严重危害全世界动植物和人类的健康。电袋除尘器结合了电除尘器和袋除尘器的各自优势,很好地解决了对细微粉尘的收集难题,但人们至今仍对荷电粉尘粒子向滤袋表面层的运动规律以及提高过滤除尘效率的机理解释不清。本文研究的目的在于使人们初步了解荷电粉尘粒子从电区向滤袋表面运动的轨迹,探讨收尘机理,指导如何保持电袋除尘器内气流的均布,使电袋除尘器始终保持高效运行状态。本文运用电除尘和过滤除尘理论以及气溶胶力学理论,在“前电后袋”式电袋除尘器模型中,对荷电粉尘粒子的凝并作用和其在滤袋表面的堆积规律、机理和影响电袋除尘器除尘效率的主要因素进行了详细分析,建立了荷电粉尘粒子向过滤层表面运动过程的数学模型。运用GAMBIT软件对电袋除尘器装置建立了仿真模型,并以滤袋区为研究对象,借助ANSYS软件模拟了粉尘粒子向滤袋表面运动情况及在滤袋表面的气流速度分布情况,通过改变滤袋长度、滤袋个数和排列方式其中任意一个条件,进行对比实验。随后通过分析滤袋表面含尘气流速度分布情况图,分别得出符合要求的布袋结构大小、滤袋个数、排列方式及其对应的入口风速,再将其具体数值大小导入EXCEL表格中,利用数学手段得出均方差来判断气流的均匀性,优化袋区结构,最终得出电袋除尘效果最佳的滤袋尺寸、排列方式和入口风速。研究结果表明,荷电粉尘间的凝并效果较未荷电的更好,在滤袋表面的堆积状态由于感应静电力使粉尘间产生排斥作用呈疏松堆积,而未荷电的粉尘则是致密堆积。不同种类的粉尘粒子在各个滤袋的捕集量的多少与尘粒本身密度大小有关,密度大的粉尘在气流速度相同的情况下由于其随气流高速运动而产生的惯性更大,故在后排滤袋粉尘的被捕集量更多。对于不同的滤袋排列方式,气流在滤袋表面的速度大小也不相同,且最大气流速度值会随着滤袋个数的增加而减小。通过分析影响荷电粉尘粒子过滤除尘效率的主要因素,借助相关软件模拟电袋除尘器中滤袋表面的气流速度分布情况,再结合数学手段作具体分析,确立了电袋除尘效率最佳的袋区尺寸、滤袋个数和入口风速为:袋区长5米,袋宽2米,滤袋个数为9个,入口风速为/4.0sm,滤袋的排列方式为按“333”排列。可为今后研究电袋除尘器如何保持高除尘效率以及选型和气流均布鉴定提供理论参考。
[Abstract]:Nowadays, the process of industrialization and urbanization in China is accelerating day by day, and the environmental pollution problem is becoming more and more serious. Inhalable smoke dust seriously endangers the health of animals, plants and human beings all over the world. The ESP combines the respective advantages of ESP and PSP, and solves the problem of collecting fine dust. However, the movement of charged dust particles to the surface layer of the filter bag and the mechanism of improving the efficiency of filtration dust removal are still unclear. The purpose of this paper is to make people understand the trajectory of charged dust particles moving from the electric area to the surface of the filter bag, to discuss the mechanism of dust collection, and to guide how to keep the airflow uniformity in the bag dust collector. Make the bag dust collector always maintain efficient operation state. In this paper, the coagulation and consolidation of charged dust particles and their accumulation on the surface of the filter bag in the model of "front and rear bag" electric bag dust precipitator are studied by using the theory of electric dust collection, filtration and dust removal and aerosol mechanics theory. The mechanism and the main factors affecting the dust removal efficiency of the ESP were analyzed in detail and the mathematical model of the movement of charged dust particles to the surface of the filter layer was established. The simulation model of the ESP device is established by using GAMBIT software, and the flow velocity distribution on the filter bag surface is simulated by using ANSYS software to simulate the movement of dust particles to the filter bag surface. By changing the length, number and arrangement of filter bags, a comparative experiment was carried out. Then, by analyzing the distribution of dust-containing airflow velocity on the filter bag surface, the structure size, the number of filter bags, the arrangement mode and the corresponding inlet wind speed are obtained respectively, and then the specific values are introduced into the EXCEL table. The mean square deviation was obtained to judge the uniformity of airflow, optimize the structure of bag area, and finally obtained the best filter bag size, arrangement mode and inlet wind speed. The results show that the condensing effect of charged dust is better than that of uncharged dust, and the stacking state on the surface of filter bag is loosely stacked due to inductive electrostatic force, while the uncharged dust is dense. The amount of dust particles in each filter bag is related to the density of the dust particles. When the velocity of the air flow is the same, the dust has more inertia due to the high velocity of the air flow. Therefore, in the back of the filter bag dust arrested more. The velocity of airflow on the surface of filter bag is different for different arrangement of filter bags, and the maximum velocity value will decrease with the increase of the number of filter bags. By analyzing the main factors that affect the dust removal efficiency of charged dust particle filter, the distribution of airflow velocity on the filter bag surface in the electrostatic bag dust collector is simulated by relevant software, and the concrete analysis is made with mathematical means. The optimum bag area size of the electric bag dust removal efficiency was established. The number of the filter bags and the inlet wind speed were as follows: the bag area length was 5 meters, the bag width was 2 meters, the filter bag number was 9, the inlet wind speed was 4.0 sm. the arrangement of the filter bags was arranged according to "333". It can provide a theoretical reference for the future study on how to keep high dust removal efficiency, type selection and identification of airflow distribution.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X701.2
本文编号：2180317
[Abstract]:Nowadays, the process of industrialization and urbanization in China is accelerating day by day, and the environmental pollution problem is becoming more and more serious. Inhalable smoke dust seriously endangers the health of animals, plants and human beings all over the world. The ESP combines the respective advantages of ESP and PSP, and solves the problem of collecting fine dust. However, the movement of charged dust particles to the surface layer of the filter bag and the mechanism of improving the efficiency of filtration dust removal are still unclear. The purpose of this paper is to make people understand the trajectory of charged dust particles moving from the electric area to the surface of the filter bag, to discuss the mechanism of dust collection, and to guide how to keep the airflow uniformity in the bag dust collector. Make the bag dust collector always maintain efficient operation state. In this paper, the coagulation and consolidation of charged dust particles and their accumulation on the surface of the filter bag in the model of "front and rear bag" electric bag dust precipitator are studied by using the theory of electric dust collection, filtration and dust removal and aerosol mechanics theory. The mechanism and the main factors affecting the dust removal efficiency of the ESP were analyzed in detail and the mathematical model of the movement of charged dust particles to the surface of the filter layer was established. The simulation model of the ESP device is established by using GAMBIT software, and the flow velocity distribution on the filter bag surface is simulated by using ANSYS software to simulate the movement of dust particles to the filter bag surface. By changing the length, number and arrangement of filter bags, a comparative experiment was carried out. Then, by analyzing the distribution of dust-containing airflow velocity on the filter bag surface, the structure size, the number of filter bags, the arrangement mode and the corresponding inlet wind speed are obtained respectively, and then the specific values are introduced into the EXCEL table. The mean square deviation was obtained to judge the uniformity of airflow, optimize the structure of bag area, and finally obtained the best filter bag size, arrangement mode and inlet wind speed. The results show that the condensing effect of charged dust is better than that of uncharged dust, and the stacking state on the surface of filter bag is loosely stacked due to inductive electrostatic force, while the uncharged dust is dense. The amount of dust particles in each filter bag is related to the density of the dust particles. When the velocity of the air flow is the same, the dust has more inertia due to the high velocity of the air flow. Therefore, in the back of the filter bag dust arrested more. The velocity of airflow on the surface of filter bag is different for different arrangement of filter bags, and the maximum velocity value will decrease with the increase of the number of filter bags. By analyzing the main factors that affect the dust removal efficiency of charged dust particle filter, the distribution of airflow velocity on the filter bag surface in the electrostatic bag dust collector is simulated by relevant software, and the concrete analysis is made with mathematical means. The optimum bag area size of the electric bag dust removal efficiency was established. The number of the filter bags and the inlet wind speed were as follows: the bag area length was 5 meters, the bag width was 2 meters, the filter bag number was 9, the inlet wind speed was 4.0 sm. the arrangement of the filter bags was arranged according to "333". It can provide a theoretical reference for the future study on how to keep high dust removal efficiency, type selection and identification of airflow distribution.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X701.2
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，本文编号：2180317
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