燃煤电厂烟气中SO3协同控制情况及排放现状

doi:10.11930/j.issn.1004-9649.201808069

中国电力 ›› 2019, Vol. 52 ›› Issue (10): 155-161.DOI: 10.11930/j.issn.1004-9649.201808069

燃煤电厂烟气中SO₃协同控制情况及排放现状

李小龙^1,2, 李军状^1,2, 段玖祥^1,2, 易玉萍^1,2, 张文杰^1,2

1. 国电科学技术研究院有限公司, 江苏南京 210046;
2. 国电南京电力试验研究有限公司, 江苏南京 210046

收稿日期:2018-08-14 修回日期:2018-12-28 出版日期:2019-10-05 发布日期:2019-10-12
作者简介:李小龙(1988-),男,硕士,工程师,从事火电厂大气污染控制与监测研究,E-mail:qianyoushun@163.com;李军状(1981-),男,硕士,高级工程师,从事火电厂大气污染控制与监测研究,E-mail:lijunzhuang@nepri.com;段玖祥(1970-),男,高级工程师,从事火电厂大气污染控制与监测研究,E-mail:duanjiuxiang@nepri.com;易玉萍(1965-)女,高级工程师,从事火电厂大气污染控制与监测研究,E-mail:yiyuping@nepri.com;张文杰(1981-),男,硕士,高级工程师,从事火电厂大气污染控制与监测研究,E-mail:zhangwenjie@nepri.com
基金资助:
国家自然科学基金资助项目（41771498）；国家重点研发计划资助项目（2017YFB0603203）。

SO₃ Cooperative Control and Emission Situation in the Flue Gas of Coal-Fired Power Plant

LI Xiaolong^1,2, LI Junzhuang^1,2, DUAN Jiuxiang^1,2, YI Yuping^1,2, ZHANG Wenjie^1,2

1. Guodian Science and Technology Research Institute Co., Ltd., Nanjing 210046, China;
2. Guodian Nanjing Electric Test Research Co., Ltd., Nanjing 210046, China

Received:2018-08-14 Revised:2018-12-28 Online:2019-10-05 Published:2019-10-12
Supported by:
This work is supported by National Natural Science Foundation of China (No.41771498) and National Key R&D Program of China (No.2017YFB0603203).

摘要/Abstract

摘要： 燃煤电厂锅炉燃烧中SO₂/SO₃的转化率为0.5%~5%；超低排放条件下，SCR脱硝中SO₂/SO₃的转化率控制在1%以内。运行中为控制SO₃在脱硝催化剂下层和空预器中的消耗，应尽量减少H₂SO₄和NH₄HSO₄的冷凝吸附，保证催化剂的活性及空预器的安全运行。理论上低低温电除尘器（LL-ESP）对SO₃脱除效果显著，但不同工程实测表明，LL-ESP对SO₃的脱除效率差别较大，介于1.8%~96.6%之间。此外，研究认为，电袋复合除尘器对SO₃脱除效率为74.3%~85.9%。超低排放工况下，除空塔脱硫和海水脱硫技术外，大部分湿法脱硫技术对SO₃的脱除效率高于50%；SO₃在湿式电除尘器中的脱除效率也大于50%，但整体上与国外成熟案例相比稍有差距。总体而言，超低排放条件下，燃煤硫分低于1.5%时，燃煤电厂全流程环保净化设备对SO₃的综合脱除效率高于90%，大部分机组的SO₃排放浓度低于5 mg/m³。

关键词: 燃煤电厂, 超低排放, SO₃, 协同控制, 排放限值

Abstract: The conversion rate of SO₂/SO₃ is 0.5%~5% in boiler combustion, but it can be controlled within 1% in SCR DeNO_x in coal-fired power plant. In operation, to control the consumption of SO₃ in the sub-layer of SCR catalyst and air pre-heater in operation, the condensation adsorption quantity of H₂SO₄ and NH₄HSO₄ should be reduced as much as possible, which is aimed at protecting the catalyst activity and ensuring the safety of air pre-heater operation. Theoretically, the low-low temperature electrostatic precipitator has the excellent removal efficiency for SO₃. However, the efficiency may changes from 1.8% to 96.6% in different projects. Study shows that the electrostatic-bag filter has removal efficiency about 74.3%~85.9% for SO₃. Most technologies of wet flue gas desulfurization have removal efficiency of above 50% for SO₃ except the empty absorption tower desulfurization and seawater desulfurization under ultra-low emission condition. Besides, the removal efficiency of wet electrostatic precipitator for SO₃ can be above 50% as well, although there is still a slight gap compared with the mature cases abroad. Overall, the comprehensive removal efficiency for SO₃ of the whole process environmental protection purification equipment of ultra-low emission coal-fired power plants is over 90% and the SO₃ emission concentration of most units are less than 5 mg/m³, when the sulfur content of coal is under 1.5%.

Key words: coal-fired power plant, ultra-low emission, SO₃, cooperation control, emission limit

中图分类号:

X829

李小龙, 李军状, 段玖祥, 易玉萍, 张文杰. 燃煤电厂烟气中SO₃协同控制情况及排放现状[J]. 中国电力, 2019, 52(10): 155-161.

LI Xiaolong, LI Junzhuang, DUAN Jiuxiang, YI Yuping, ZHANG Wenjie. SO₃ Cooperative Control and Emission Situation in the Flue Gas of Coal-Fired Power Plant[J]. Electric Power, 2019, 52(10): 155-161.

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https://www.electricpower.com.cn/CN/Y2019/V52/I10/155

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燃煤电厂烟气中SO₃协同控制情况及排放现状

SO₃ Cooperative Control and Emission Situation in the Flue Gas of Coal-Fired Power Plant

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