Experimental study on SO<sub>3</sub> removal for a 0.3 MW circulating fluidized bed coal-fired boiler

YANG Zhao; HUANG Yaji; HUANG Xuexi; JI Xueqin; DONG Lu; WANG Fangyong; GUO Xuemin

doi:10.19666/j.rlfd.201706046

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Experimental study on SO₃ removal for a 0.3 MW circulating fluidized bed coal-fired boiler

更新时间：2025-09-28

- Experimental study on SO₃ removal for a 0.3 MW circulating fluidized bed coal-fired boiler
- Thermal Power Generation Vol. 47, Issue 3, Pages: 62-67(2018)
- 作者机构：
  
  1. 东南大学能源热转换及其过程测控教育部重点实验室
  2. 芜湖发电有限责任公司
  3. 南京开拓环保科技有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201706046
  CLC： X701
- Published Online：07 March 2018，
  
  Published：2018
- 稿件说明：
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YANG Zhao, HUANG Yaji, HUANG Xuexi, et al. Experimental study on SO₃ removal for a 0.3 MW circulating fluidized bed coal-fired boiler[J]. Thermal power generation, 2018, 47(3): 62-67.
DOI：

YANG Zhao, HUANG Yaji, HUANG Xuexi, et al. Experimental study on SO₃ removal for a 0.3 MW circulating fluidized bed coal-fired boiler[J]. Thermal power generation, 2018, 47(3): 62-67. DOI： 10.19666/j.rlfd.201706046.

摘要

燃煤电厂选择性催化还原(SCR)脱硝系统中SO_3与NH3生成的硫酸氢铵在低温下冷凝沉积是限制脱硝温度窗口的主要原因

且SO_3还易导致锅炉尾部设备低温腐蚀、堵灰。对此

本文在自行设计及搭建的0.3 MW循环流化床燃煤锅炉中试台上

采用在SCR脱硝系统前喷射Na_2CO_3溶液的方式

研究中低温条件下

喷射Na_2CO_3溶液对SO_3和NOx脱除效果的影响

探究此方法实现燃煤电厂低负荷脱硝同时满足国家NOx排放标准的可行性。结果表明:采用SCR脱硝系统前喷射Na_2CO_3溶液方式时

SO_3脱除效率随Na_2CO_3/SO_3摩尔比的增大而升高

增长趋势减缓;SCR脱硝反应器前喷射Na_2CO_3溶液并不会因为SO2的存在而影响Na_2CO_3溶液对SO_3的脱除效果;在SCR脱硝系统前喷射Na_2CO_3溶液不会对脱硝造成显著影响;此外

280℃下采用SCR脱硝系统前喷射Na_2CO_3溶液的方式

能够提高低温脱硝效率。该结论为锅炉低负荷脱硝提供了试验数据。

Abstract

Condensation of ammonium bisulfate produced by SO_3 and NH3 in the SCR denitration system at low temperature is the main reason for limiting the denitration temperature window of coal-fired power plants. At the same time

SO_3 is also the source of low temperature corrosion on the boiler tail equipments and ash clogging. To solve this problem

the self-built 0.3 MW circulating fluidized bed boiler(pilot scale) was applied to carry out pollutant removal test by spraying Na_2CO_3 solution before the SCR denitration system at medium and low temperatures. The effect of spraying Na_2CO_3 solution on removal of SO_3 and NOx were studied. On this basis

this method was explored to broaden the denitration temperature window to achieve low load denitration for coal-fired power plants and to meet the national NOx emission standards. The results show that

the removal efficiency of SO_3 increased with the molar ratio of Na_2CO_3 to SO_3

and the growth rate decreased gradually. Spraying Na_2CO_3 solution before the SCR reactor didn't affect the removal effect of SO_3 due to the presence of SO2

and didn't significantly affect the denitration

either. In addition

the low temperature denitration experiment at 280 ℃ shows that the denitration efficiency can be improved by spraying the Na_2CO_3 solution before the SCR reactor. This conclusion can provide a reference for low load denitration.

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Experimental study on SO3 removal for a 0.3 MW circulating fluidized bed coal-fired boiler

DOI：10.19666/j.rlfd.201706046

摘要

Abstract

关键词

Keywords

references

Experimental study on SO₃ removal for a 0.3 MW circulating fluidized bed coal-fired boiler