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During the operation of selective catalytic reduction (SCR) flue gas denitration system of coal-fired units, NH3 and SO3 in the flue gas generate liquid ammonium bisulfate (ABS) at a specific temperature, which is viscous and easy to cause catalyst deactivation at 0~40% low load due to micropore plugging and aggravate the fly ash blockage of heat exchange elements at the cold end of air preheater. Alkali powder injection to remove SO3 from flue gas is an important method to control ABS. However, the existing grid type multi-nozzle device has problems of uneven injection and low SO3 removal efficiency. A vertical gas-solid fluidization mixing and distribution injection device is developed to improve the uniformity of absorbent powder injection in the flue section. The pilot test results show that, the SO3 removal efficiency at upstream of the SCR denitration system reaches 55.6%, the condensation temperature of the catalyst ABS decreases by 8.6 ℃, and the minimum operation temperature decreases by 11.9 ℃, which can expand the lower limit of the catalyst operation temperature and reduce the restriction on the lower limit of the peak load of the unit. The SO3 removal efficiency at upstream of the air preheater reaches 84.3%, and the ABS deposition influence coefficient decreases by 86.9%, which can delay the ABS ash blockage at the cold end of the air preheater. The SO3 emission mass concentration from the chimney is 2.5~3.4 mg/m3, which can eliminate blue smoke.

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燃煤机组选择性催化还原(SCR)烟气脱硝系统在运行过程中,烟气中的NH3与SO3在特定温度下生成液态硫酸氢铵(ABS),易在0~40%低负荷造成脱硝催化剂ABS失活和加剧空气预热器冷端换热元件ABS灰垢堵塞。碱粉喷射脱除SO3是控制ABS的重要方法,但现有的格栅式多喷嘴装置存在喷射不均、SO3脱除效率低等问题。研发了立式气固流态化混合分配装置,改善了烟道截面的粉体喷射均匀性。中试试验结果显示:SCR脱硝系统上游烟气中的SO3脱除效率达到55.6%,催化剂ABS结露温度降低8.6 ℃,最低连续喷氨运行温度降低11.9 ℃,可拓展催化剂安全运行温度下限,并减轻对机组调峰负荷下限的制约;空气预热器上游SO3脱除效率达到84.3%,ABS沉积影响系数降低86.9%,可延缓空气预热器冷端的ABS灰垢堵塞;烟囱SO3排放浓度约为2.5~3.4 mg/m3,可消除蓝色烟羽。

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宋玉宝(1972),男,博士,研究员,主要研究方向为燃煤锅炉氮氧化物协同控制技术,

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宋玉宝(1972),男,博士,研究员,主要研究方向为燃煤锅炉氮氧化物协同控制技术,

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碱基吸收剂脱除SO3试验研究
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宋玉宝 1 , 谢新华 1 , 何川 1 , 宋友亚 2 , 虢德军 2 , 赵雪成 1 , 马云龙 1 , 方朝君 1
热力发电 | 热能科学研究 2023,52(5): 122-126
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热力发电 | 热能科学研究 2023, 52(5): 122-126
碱基吸收剂脱除SO3试验研究
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宋玉宝1 , 谢新华1, 何川1, 宋友亚2, 虢德军2, 赵雪成1, 马云龙1, 方朝君1
作者信息
  • 1.西安热工研究院有限公司苏州分公司,江苏 苏州 215153
  • 2.华能湖南岳阳发电有限责任公司,湖南 岳阳 414002
  • 宋玉宝(1972),男,博士,研究员,主要研究方向为燃煤锅炉氮氧化物协同控制技术,

Experimental study on SO3 removal by alkaline absorbent
Yubao SONG1 , Xinhua XIE1, Chuan HE1, Youya SONG2, Dejun GUO2, Xuecheng ZHAO1, Yunlong MA1, Zhaojun FANG1
Affiliations
  • 1.Xi'an Thermal Power Research Institute Co., Ltd. Suzhou Branch, Suzhou 215153, China
  • 2.Huaneng Hunan Yueyang Power Generation Co., Ltd., Yueyang 414002, China
出版时间: 2023-05-25 doi: 10.19666/j.rlfd.202212139
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燃煤机组选择性催化还原(SCR)烟气脱硝系统在运行过程中,烟气中的NH3与SO3在特定温度下生成液态硫酸氢铵(ABS),易在0~40%低负荷造成脱硝催化剂ABS失活和加剧空气预热器冷端换热元件ABS灰垢堵塞。碱粉喷射脱除SO3是控制ABS的重要方法,但现有的格栅式多喷嘴装置存在喷射不均、SO3脱除效率低等问题。研发了立式气固流态化混合分配装置,改善了烟道截面的粉体喷射均匀性。中试试验结果显示:SCR脱硝系统上游烟气中的SO3脱除效率达到55.6%,催化剂ABS结露温度降低8.6 ℃,最低连续喷氨运行温度降低11.9 ℃,可拓展催化剂安全运行温度下限,并减轻对机组调峰负荷下限的制约;空气预热器上游SO3脱除效率达到84.3%,ABS沉积影响系数降低86.9%,可延缓空气预热器冷端的ABS灰垢堵塞;烟囱SO3排放浓度约为2.5~3.4 mg/m3,可消除蓝色烟羽。

燃煤机组  /  SO3  /  碱基吸收剂  /  气固流态化  /  CFD模拟  /  中试试验

During the operation of selective catalytic reduction (SCR) flue gas denitration system of coal-fired units, NH3 and SO3 in the flue gas generate liquid ammonium bisulfate (ABS) at a specific temperature, which is viscous and easy to cause catalyst deactivation at 0~40% low load due to micropore plugging and aggravate the fly ash blockage of heat exchange elements at the cold end of air preheater. Alkali powder injection to remove SO3 from flue gas is an important method to control ABS. However, the existing grid type multi-nozzle device has problems of uneven injection and low SO3 removal efficiency. A vertical gas-solid fluidization mixing and distribution injection device is developed to improve the uniformity of absorbent powder injection in the flue section. The pilot test results show that, the SO3 removal efficiency at upstream of the SCR denitration system reaches 55.6%, the condensation temperature of the catalyst ABS decreases by 8.6 ℃, and the minimum operation temperature decreases by 11.9 ℃, which can expand the lower limit of the catalyst operation temperature and reduce the restriction on the lower limit of the peak load of the unit. The SO3 removal efficiency at upstream of the air preheater reaches 84.3%, and the ABS deposition influence coefficient decreases by 86.9%, which can delay the ABS ash blockage at the cold end of the air preheater. The SO3 emission mass concentration from the chimney is 2.5~3.4 mg/m3, which can eliminate blue smoke.

coal-fired unit  /  SO3  /  alkaline absorbent  /  gas-solid fluidization  /  CFD simulation  /  pilot test
宋玉宝, 谢新华, 何川, 宋友亚, 虢德军, 赵雪成, 马云龙, 方朝君. 碱基吸收剂脱除SO3试验研究. 热力发电, 2023 , 52 (5) : 122 -126 . DOI: 10.19666/j.rlfd.202212139
Yubao SONG, Xinhua XIE, Chuan HE, Youya SONG, Dejun GUO, Xuecheng ZHAO, Yunlong MA, Zhaojun FANG. Experimental study on SO3 removal by alkaline absorbent[J]. Thermal Power Generation, 2023 , 52 (5) : 122 -126 . DOI: 10.19666/j.rlfd.202212139
  • 苏州市重点产业技术创新项目(SGC2021121)
2023年第52卷第5期
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doi: 10.19666/j.rlfd.202212139
  • 首发时间:2026-01-23
  • 出版时间:2023-05-25
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  • 修回日期:2022-12-12
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Technological Innovation of Key Industries in Suzhou(SGC2021121)
苏州市重点产业技术创新项目(SGC2021121)
作者信息
    1.西安热工研究院有限公司苏州分公司,江苏 苏州 215153
    2.华能湖南岳阳发电有限责任公司,湖南 岳阳 414002
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2种不同金属材料的力学参数

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Genus
种数
Number of
species
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Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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