Study on WESP Multi-pollutant Emission Reduction and Energy Efficiency Test of Ultra-low Emission Unit

doi:10.12096/j.2096-4528.pgt.21055

Abstract

Abstract:

Wet electrostatic precipitator (WESP) is a fine treatment equipment for the treatment of coal flue gas. Taking a 660 MW ultra-low emission unit as the research object, the multi-pollutant removal performance and energy efficiency parameters of WESP were tested and analyzed systematically. The removal efficiencies of particulate matter, fog drop, SO₃ and Hg of WESP were 81.12%, 75.60%, 76.13% and 53.08%, respectively, and the power consumption was 402.6 (kW·h)/h, which met the design requirements. The emission mass concentration of each pollutant were 4.20, 17.25, 9.80, 4.08×10^-4 mg/m³, respectively, the emission factors were 13.76, 56.49, 32.10, 1.34×10^-3 g/(kW·h),respectively, the specific power consumption was 1.48×10^-4 (kW·h)/m³.The energy consumption for particle removal per unit mass was 22.87 (kW·h)/kg, which was in the industry average level. This study can provide reference for the subsequent pollutant reduction and energy efficiency control of coal-fired power plants.

Key words: wet electrostatic precipitator (WESP), coal-fired power plant, pollutant emission reduction, removal efficiency, indicators of energy efficiency

CLC Number:

TK 09

Hanxiao LIU, Gaofei GUO, Zhaomei CHEN. Study on WESP Multi-pollutant Emission Reduction and Energy Efficiency Test of Ultra-low Emission Unit[J]. Power Generation Technology, 2023, 44(1): 94-99.

Figures/Tables 7

References 18

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项目	参数	设计煤种	试验煤种
工业分析	收到基水分质量分数M_ar/%	7.48	8.80
	收到基灰分质量分数A_ar/%	24.61	26.27
	干燥无灰基挥发分质量分数V_daf/%	15.70	18.18
	收到基低位发热量Q_net，ar/(MJ/kg)	22.97	21.75
	可磨性系数K_YT1	1.585	—
元素分析	收到基碳质量分数C_ar/%	60.4	56.78
	收到基氢质量分数H_ar/%	2.89	2.90
	收到基氧质量分数O_ar/%	3.07	3.47
	收到基氮质量分数N_ar/%	0.87	0.94
	收到基硫质量分数S_ar/%	0.68	0.84

项目	参数	设计煤种	试验煤种
工业分析	收到基水分质量分数M_ar/%	7.48	8.80
	收到基灰分质量分数A_ar/%	24.61	26.27
	干燥无灰基挥发分质量分数V_daf/%	15.70	18.18
	收到基低位发热量Q_net，ar/(MJ/kg)	22.97	21.75
	可磨性系数K_YT1	1.585	—
元素分析	收到基碳质量分数C_ar/%	60.4	56.78
	收到基氢质量分数H_ar/%	2.89	2.90
	收到基氧质量分数O_ar/%	3.07	3.47
	收到基氮质量分数N_ar/%	0.87	0.94
	收到基硫质量分数S_ar/%	0.68	0.84

参数	数值
入口烟气量/(m³/s)	802.8
入口烟气温度/℃	50
出口烟气温度/℃	49
入口烟尘质量浓度/(mg/m³)	≤25
设计除尘效率/%	≥80
入口雾滴质量浓度/(mg/m³)	≤75
设计雾滴脱除效率/%	≥75
入口SO₃质量浓度/(mg/m³)	≤50
设计SO₃脱除效率/%	≥70
设计Hg脱除效率/%	≥50
流通面积/m²	2×149
烟气流速/(m/s)	2.7
极间距/m	0.3
总集尘面积/m²	8741
比集尘面积/[m²/(m³/s)]	10.9

参数	数值
入口烟气量/(m³/s)	802.8
入口烟气温度/℃	50
出口烟气温度/℃	49
入口烟尘质量浓度/(mg/m³)	≤25
设计除尘效率/%	≥80
入口雾滴质量浓度/(mg/m³)	≤75
设计雾滴脱除效率/%	≥75
入口SO₃质量浓度/(mg/m³)	≤50
设计SO₃脱除效率/%	≥70
设计Hg脱除效率/%	≥50
流通面积/m²	2×149
烟气流速/(m/s)	2.7
极间距/m	0.3
总集尘面积/m²	8741
比集尘面积/[m²/(m³/s)]	10.9

型号名称	型号	厂家
大气压力表	Testo 622	—
烟尘采样仪	3012H	青岛崂应
紫外可见光分光光度计	Hach DR5000	哈希
高温烟气采样枪	ZR-D03A	青岛众瑞
电子天平	AE-100	瑞士梅特勒
汞分析仪	RA-915F	鲁梅克斯
烟气汞综合采样器	ZR-3700A	青岛众瑞