燃煤机组SO3生成与控制技术路线分析

doi:10.11930/j.issn.1004-9649.202304053

中国电力 ›› 2024, Vol. 57 ›› Issue (6): 235-242.DOI: 10.11930/j.issn.1004-9649.202304053

• 节能与环保 • 上一篇

燃煤机组SO₃生成与控制技术路线分析

刘东旭¹(), 张潇元²(), 马青³, 冯前伟⁴, 杜振⁴()

1. 北京睿源达企业管理咨询有限责任公司，北京　100193
2. 北京新叶科技有限公司，北京　100080
3. 北京新叶能源科技有限公司，北京　100085
4. 华电电力科学研究院有限公司，浙江杭州　310030

收稿日期:2023-04-17 出版日期:2024-06-28 发布日期:2024-06-25
作者简介:刘东旭（1984—），男，硕士，工程师，从事电厂环保设计研究和技术服务，E-mail：18610096120@163.com
张潇元（1983—），女，硕士，工程师，从事电厂环保设计研究和技术服务，E-mail：18600671593@163.com
杜振（1985—），男，通信作者，硕士，高级工程师，从事火电厂大气污染综合治理、细颗粒物污染物控制技术研究，E-mail：adozn@163.com
基金资助:
国家重点研发计划资助项目（流化床炉污染物短流程高效治理协同降碳技术与示范，2022YFC3701505）。

Analysis on SO₃ Generation, Migration and Control Technology of Coal-fired Units

Dongxu LIU¹(), Xiaoyuan ZHANG²(), Qing MA³, Qianwei FENG⁴, Zhen DU⁴()

1. Beijing Rui Yuan da Enterprise Management Consulting Co., Ltd., Beijing 100193, China
2. Beijing Newleaf Technology Co., Ltd., Beijing 100080, China
3. Beijing Newleaf Energy Technology Co., Ltd., Beijing 100085, China
4. Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China

Received:2023-04-17 Online:2024-06-28 Published:2024-06-25
Supported by:
This work is supported by Key Research and Development Program of China (Collaborative Carbon Reduction Technology and Demonstration for Short Process Efficient Treatment of Pollutants in Fluidized Bed Boilers, No.2022YFC3701505).

摘要/Abstract

摘要：

为系统分析燃煤机组SO₃排放特性，通过对58台机组SO₃生成和脱除情况进行测试，分析了炉内燃烧SO₃生成、脱硝系统SO₂/SO₃转化情况，以及干式除尘器、湿法脱硫系统和湿式除尘器对SO₃的脱除效果，从而获得燃煤机组SO₃生成、迁移及控制规律。结果表明：燃煤机组SO₃生成主要是由炉膛燃烧生成和脱硝系统SO₂转化生成，其中炉内燃烧SO₃的生成率约为炉内燃烧产生的SO₂总量的1%，脱硝系统SO₂/SO₃的转化率也约为1%。静电除尘器、电袋除尘器以及湿法脱硫系统对SO₃的脱除效果有限，静电除尘器SO₃脱除效率为15%~25%，电袋除尘器为20%~40%，湿法脱硫系统为40%~60%；而低低温除尘器和湿式除尘器具备较高的SO₃脱除效果，低低温除尘器SO₃脱除效率为50%~80%，湿式除尘器为70%~90%。因此通过控制燃煤硫份或脱硝系统SO₂/SO₃转化率可以有效地控制SO₃的生成，采用低低温除尘器和湿式除尘器可以有效降低SO₃的排放，通过干式除尘器+湿法脱硫系统+湿式除尘器可将SO₃控制在10 mg/m³以下。

关键词: SO₃生成, SO₂/SO₃转化, 干式除尘器, 湿法脱硫系统, 湿式除尘器

Abstract:

In order to analyze the SO₃ emission characteristics of coal-fired units, testing the generation and removal of SO₃ for the 58 units, analyze the generation of SO₃ from combustion in the furnace, the conversion of SO₂/SO₃ from denitration system, and the removal effect of SO₃ for dry dust remover, wet desulfurization system, and wet dust remover, so as to obtain the rule of generation, migration, and removal of SO₃ in coal-fired units. The results show that the generation of SO₃ in coal-fired units is mainly composed of the combustion of coal sulfur and the conversion of SO₂ in the denitration system. The generation rate of SO₃ during furnace combustion is approximately 1% of the total amount of SO₂ generated during furnace combustion, and the conversion rate of SO₂/SO₃ in the denitration system is also at 1%. The electrostatic precipitator, electrostatic bag precipitator and wet desulfurization system have limited removal effect on SO₃. The removal efficiency of electrostatic precipitator, electrostatic bag precipitator and wet desulfurization system is 15%~25%, 20%~40% and 40%~60%. The low temperature dust remover and wet dust remover have high SO₃ removal efficiency. The SO₃ removal efficiency of low temperature dust remover is 50%~80%, and that of wet dust remover is 70%~90%. Therefore, the generation of SO₃ can be effectively controlled by controlling the sulfur content of coal combustion or the SO₂/SO₃ conversion rate of the catalyst in the denitration system. At the same time, low temperature dust collectors and wet dust collectors can be used to control the emission of SO₃, and SO₃ can be controlled below 10mg/m³ through the dry dust collectors, wet desulfurization system, and wet dust collectors.

Key words: SO₃ generation, SO₂/SO₃ conversion, dry dust remover, wet desulfurization system, wet dust remover

刘东旭, 张潇元, 马青, 冯前伟, 杜振. 燃煤机组SO₃生成与控制技术路线分析[J]. 中国电力, 2024, 57(6): 235-242.

Dongxu LIU, Xiaoyuan ZHANG, Qing MA, Qianwei FENG, Zhen DU. Analysis on SO₃ Generation, Migration and Control Technology of Coal-fired Units[J]. Electric Power, 2024, 57(6): 235-242.

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图/表 9

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机组类型	装机容量等级/ MW	机组数量	脱硝系统	干式除尘器	湿法脱硫系统	湿式除尘器
A	300	6	低氮燃烧+SCR	双室四电场	单塔单循环	导电玻璃钢极板
	300	5	低氮燃烧+SCR	低低温省煤器+双室四电场	单塔单循环	—
	300	2	低氮燃烧+SCR	低低温省煤器+双室四电场	双塔双循环	—
	300	7	低氮燃烧+SCR	电袋复合除尘器	双塔双循环	—
	300	5	低氮燃烧+SCR	双室四电场	双塔双循环	导电玻璃钢极板
	300	3	低氮燃烧+SCR	双室四电场	双塔双循环	—
	300	4	低氮燃烧+SCR	双室四电场	双塔双循环	金属阳极板
B	600	3	低氮燃烧+SCR	双室五电场	单塔单循环	导电玻璃钢极板
	600	3	低氮燃烧+SCR	低低温省煤器+双室四电场	单塔单循环	—
	600	4	低氮燃烧+SCR	电袋复合除尘器	双塔双循环	—
	600	3	低氮燃烧+SCR	双室四电场	双塔双循环	导电玻璃钢极板
	600	3	低氮燃烧+SCR	低低温省煤器+双室四电场	双塔双循环
C	1000	4	低氮燃烧+SCR	低低温省煤器+双室五电场	单塔单循环	—
	1000	3	低氮燃烧+SCR	双室五电场	单塔单循环	—
	1000	3	低氮燃烧+SCR	双室五电场	双塔双循环	—

机组类型	装机容量等级/ MW	机组数量	脱硝系统	干式除尘器	湿法脱硫系统	湿式除尘器
A	300	6	低氮燃烧+SCR	双室四电场	单塔单循环	导电玻璃钢极板
	300	5	低氮燃烧+SCR	低低温省煤器+双室四电场	单塔单循环	—
	300	2	低氮燃烧+SCR	低低温省煤器+双室四电场	双塔双循环	—
	300	7	低氮燃烧+SCR	电袋复合除尘器	双塔双循环	—
	300	5	低氮燃烧+SCR	双室四电场	双塔双循环	导电玻璃钢极板
	300	3	低氮燃烧+SCR	双室四电场	双塔双循环	—
	300	4	低氮燃烧+SCR	双室四电场	双塔双循环	金属阳极板
B	600	3	低氮燃烧+SCR	双室五电场	单塔单循环	导电玻璃钢极板
	600	3	低氮燃烧+SCR	低低温省煤器+双室四电场	单塔单循环	—
	600	4	低氮燃烧+SCR	电袋复合除尘器	双塔双循环	—
	600	3	低氮燃烧+SCR	双室四电场	双塔双循环	导电玻璃钢极板
	600	3	低氮燃烧+SCR	低低温省煤器+双室四电场	双塔双循环
C	1000	4	低氮燃烧+SCR	低低温省煤器+双室五电场	单塔单循环	—
	1000	3	低氮燃烧+SCR	双室五电场	单塔单循环	—
	1000	3	低氮燃烧+SCR	双室五电场	双塔双循环	—

[1]	杜振, 王志东, 江建平, 朱跃. 湿法脱硫系统PM_2.5排放特性分析[J]. 中国电力, 2021, 54(6): 153-158.
[2]	杨丁, 陈永强, 陈威祥, 郑芳, 林启超. SO₃采样技术改进及烟气处理设备SO₃脱除能力测试[J]. 中国电力, 2018, 51(7): 157-161.

燃煤机组SO₃生成与控制技术路线分析

Analysis on SO₃ Generation, Migration and Control Technology of Coal-fired Units

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