Study on SO3 Removal Performance of Low-low Temperature Electrostatic Precipitator System

doi:10.12096/j.2096-4528.pgt.19115

Abstract

Abstract:

In order to fully characterize the emission reduction performance of SO₃ by low-low temperature electrostatic precipitator system (FGC+ESP), a method to test low-concentration SO₃ was proposed, namely “two-stage controlled condensation + one-stage isopropanol absorption” sampling method, which can improve the accuracy of its test data. According to this method, in the pilot test, the SO₃ removal efficiency of the low-low temperature electrostatic precipitator (LL-ESP) system (90 ℃ at ESP entrance) was 96.15%. In four groups of field measured data from three engineering projects, the SO₃ removal efficiency of LL-ESP system was 69.1%-96.6%. The mechanism of SO₃ adsorption and agglomeration by fly ash particles under low-low temperature conditions was verified. The study results can provide reference for the large-scale promotion and application of LL-ESP technology and SO₃ emission reduction of coal-fired power plants.

Key words: coal-fired power plant, ultra-low emission, low-low temperature electrostatic precipitator system, SO₃ test method, removal performance

CLC Number:

TK 284.5

Hanxiao LIU, Jianguo LI, Yuping YAO, Ying CUI, Gaofei GUO, Haitao HE, Meiling LIU, Minchao SHEN. Study on SO₃ Removal Performance of Low-low Temperature Electrostatic Precipitator System[J]. Power Generation Technology, 2022, 43(1): 147-154.

Figures/Tables 16

References 22

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项目	煤主要成分质量分数/%		飞灰主要成分质量分数/%
项目	收到基硫S_ar	收到基灰分A_ar	Al₂O₃	SiO₂	Fe₂O₃	Na₂O	MgO	CaO	K₂O	TiO₂
设计煤种	0.49	12.80	32.09	41.32	5.14	0.76	0.59	8.00	1.01	1.26

项目	煤主要成分质量分数/%		飞灰主要成分质量分数/%
项目	收到基硫S_ar	收到基灰分A_ar	Al₂O₃	SiO₂	Fe₂O₃	Na₂O	MgO	CaO	K₂O	TiO₂
设计煤种	0.49	12.80	32.09	41.32	5.14	0.76	0.59	8.00	1.01	1.26

参数	数值
入口粉尘质量浓度/(g/m³)	15.735
入口烟气量/(m³/h)	20 928
每台炉配电除尘器数量	单室5电场(末电场为旋转电极电场)
电场有效高度/m	4
电场有效长度/m	4×3.5+1×3
电场有效宽度/m	第5电场为3，前4个电场为3.2
同极间距/mm	第5电场为460，前4个电场为400
总集尘面积/m²	第5电场为168，前4个电场为896
电源规格	工频电源5台：0.2 A/72 kV
保证除尘效率/%	设计煤种≥99.87，校核煤种≥99.9
出口粉尘质量浓度/(mg/m³)	≤15
本体压力降/Pa	≤300
本体漏风率/%	≤2

参数	数值
入口粉尘质量浓度/(g/m³)	15.735
入口烟气量/(m³/h)	20 928
每台炉配电除尘器数量	单室5电场(末电场为旋转电极电场)
电场有效高度/m	4
电场有效长度/m	4×3.5+1×3
电场有效宽度/m	第5电场为3，前4个电场为3.2
同极间距/mm	第5电场为460，前4个电场为400
总集尘面积/m²	第5电场为168，前4个电场为896
电源规格	工频电源5台：0.2 A/72 kV
保证除尘效率/%	设计煤种≥99.87，校核煤种≥99.9
出口粉尘质量浓度/(mg/m³)	≤15
本体压力降/Pa	≤300
本体漏风率/%	≤2

项目	机组容量/MW	ESP入口烟温/℃	煤种成分质量分数/%
项目	机组容量/MW	ESP入口烟温/℃	S_ar	A_ar	M_ad
A电厂 (设计煤种)	600	90	0.57	6.60	8.82
A电厂 (校核煤种)	600	90	0.67	18.04	2.46
B电厂	1 000	95	0.80	6.66	15.28
C电厂	660	90	0.61	13.68	2.42

Study on SO₃ Removal Performance of Low-low Temperature Electrostatic Precipitator System

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投运时间	电厂名称	SO₃质量浓度/(mg·m^-3)
1997	东北电力原町1号(1 000 MW)	<3.57
1998	中国电力三隅1号(1 000 MW)	<3.57
2000	J-Power橘湾(1 050 MW)	<3.57
2000	四国电力橘湾(700 MW)	<3.57
2002	北海道电力苫东厚真4号(700 MW)	<3.57
2002	神户制钢所灘浜1号(700 MW)	<3.57
2003	住友共同电力任生川(250 MW)	<3.57
2004	东京电力广野5号(600 MW)	<3.57
2004	神户制钢所灘浜2号(700 MW)	<3.57
2007	新日铁住金鹿岛(500 MW)	<3.57
2013	东京电力广野6号(600 MW)	<3.57

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