Experimental investigation on the characteristics of ash layers in a high-temperature wire-cylinder electrostatic precipitator
Experimental investigation on the characteristics of ash layers in a high-temperature wire-cylinder electrostatic precipitator
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高温丝筒静电除尘器灰层特性的实验研究
DOI：
10.1016/j.seppur.2016.01.011
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发表时间：
2016-02-08
影响因子：
8.6
通讯作者：
Cen, Kefa
中科院分区：
文献类型：
--
作者：
Ni, Mingjiang;Yang, Guang;Cen, Kefa
高温静电除尘器（ESP）在煤级转化多联产系统和IGCC等先进技术中是一种潜在的高效的热煤气净化方法。本文研究了在350 ~ 700℃温度范围内，线筒电除尘器阳极管内表面灰层的特征，包括灰层的沉积形式、灰层的生长以及灰层对背电晕放电的影响。主要有四种典型的灰渣沉积形式：带状、肋状边坡、坡状和厚底边边坡。灰层厚度一般随高度的增加而减小。当T = 500℃时，如果端口电压足够大，则颗粒以光滑的斜坡形式沉积。当T >= 700℃时，出现较厚的底灰边缘。在不同的操作条件下，灰的沉积形式会有所不同。随着操作时间的增加，给定点处的厚度增长率减小，由于灰层与颗粒之间的斥力作用，灰层高度增加。反电晕放电总是首先发生在灰层最厚的部分。当T= 500℃，U-p = 17,200 V, m(in) = 650 mg/N m时，随着灰层最大厚度从0.34 mm增加到2.02 mm，背电晕放电起始电压从19,787 V减小到17,197 V，随着灰层厚度的增加，背电晕放电起始电压几乎呈线性减小。(C) 2016 Elsevier B.V.版权所有
The high-temperature electrostatic precipitator (ESP) is a potentially efficient method for hot-gas cleaning in advanced technologies, e.g., the coal-staged conversion poly-generation system and IGCC. This paper investigates the characteristics of the ash layer on the internal surface of the anode pipe of a wire-cylinder ESP at temperatures ranging from 350 degrees C to 700 degrees C, including ash deposition forms, growth of ash layer and the effect of ash layer on back corona discharge. There are four typical ash deposition forms: the belt form, the slope with ribs form, the slope form and the slope with a thick bottom edge form. Ash layer thickness generally decreases with increasing height. When T = 500 degrees C, particles are deposited in the smooth slope form if the port voltage is great enough. When T >= 700 degrees C, a thick bottom ash edge occurs. Ash deposition forms can vary under different operating conditions. As the operating time increases, the thickness growth rate at a given point decreases, and the ash layer height increases because of the repulsive electrical force between the ash layer and the particles. Back corona discharge always occurs on the thickest portion of the ash layer first. The back corona discharge onset voltage decreases nearly linearly with increasing ash layer thickness, from 19,787 V to 17,197 V as the maximum thickness of the ash layer increases from 0.34 to 2.02 mm when T= 500 degrees C, U-p = 17,200 V and m(in) = 650 mg/N m(3). (C) 2016 Elsevier B.V. All rights reserved.