Application Analysis of Flue Gas Condensation Recovery in Coal-fired Power Plants by Spraying Method

doi:10.11930/j.issn.1004-9649.202302007

Abstract

Abstract:

The flue gas reaches wet saturation state after wet desulfurization tower in coal-fired power plant, and directly discharged will lead to large amount of moisture loss. Taking flue gas water recovery system as the research object by the direct spraying method, and explores the characteristic parameters of the flue gas containing water saturation, and builds an integrated device integrating with the flue gas desulfurization, water recovery and deep emissions reduction, and analyzes the operation performance. The results show that the saturated flue gas moisture content varies greatly with the flue gas temperature, and the higher the flue gas temperature, the higher the moisture content. The flue gas water recovery is obviously affected by the cold source medium. The theoretical flue gas water recovery rate is determined by the flue gas import/export moisture content and flow. The actual flue gas water recovery rate is up to 453.62 t/d, and the highest water recovery efficiency is 26.44%. The direct spraying method reduces dust emission concentration by 66%~80% and sulfur dioxide emission concentration by 50%~60%. The research results provide engineering guidance for the flue gas water recovery and utilization.

Key words: coal-fired power plant, wet saturated flue gas, water recovery, direct spraying method, deep emissions reduction

Chao YI, Da TENG, Shaowei SONG, Ou CHEN. Application Analysis of Flue Gas Condensation Recovery in Coal-fired Power Plants by Spraying Method[J]. Electric Power, 2023, 56(11): 226-235.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202302007

https://www.electricpower.com.cn/EN/Y2023/V56/I11/226

Figures/Tables 14

References 35

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煤种	全水分 M_t/%	空气干燥基水分M_ad/%	收到基灰分 M_ar/%	干燥无灰基挥发分V_daf/%	收到基碳 C_ar/%	收到基氢 H_ar/%	收到基氮 N_ar/%	收到基氧 O_ar/%	全硫 S_t,ad/%	高位发热量 Q_gr,ar/(MJ·kg^–1)	低位发热量 Q_net,ar/(MJ·kg^–1)
神华煤	19.2	6.91	10.36	37.45	56.68	3.33	0.71	9.41	0.31	22.67	21.54
印尼煤	34.6	13.98	6.56	50.82	42.40	2.84	0.65	12.62	0.33	16.89	15.51

煤种	全水分 M_t/%	空气干燥基水分M_ad/%	收到基灰分 M_ar/%	干燥无灰基挥发分V_daf/%	收到基碳 C_ar/%	收到基氢 H_ar/%	收到基氮 N_ar/%	收到基氧 O_ar/%	全硫 S_t,ad/%	高位发热量 Q_gr,ar/(MJ·kg^–1)	低位发热量 Q_net,ar/(MJ·kg^–1)
神华煤	19.2	6.91	10.36	37.45	56.68	3.33	0.71	9.41	0.31	22.67	21.54
印尼煤	34.6	13.98	6.56	50.82	42.40	2.84	0.65	12.62	0.33	16.89	15.51

脱硫区										脱水区
烟气体积分数/%					烟气流量/(m³·h^–1)	烟气温度/℃	污染物质量浓度/(mg·m^–3)			烟气温度/℃
N₂	CO₂	H₂O	O₂	SO₂	烟气流量/(m³·h^–1)	烟气温度/℃	SO₂	SO₃	粉尘	烟气温度/℃
71.14	12.77	11.23	4.82	0.04	1 220 000	95	1 400	20	20	52.3~52.6

脱硫区										脱水区
烟气体积分数/%					烟气流量/(m³·h^–1)	烟气温度/℃	污染物质量浓度/(mg·m^–3)			烟气温度/℃
N₂	CO₂	H₂O	O₂	SO₂	烟气流量/(m³·h^–1)	烟气温度/℃	SO₂	SO₃	粉尘	烟气温度/℃
71.14	12.77	11.23	4.82	0.04	1 220 000	95	1 400	20	20	52.3~52.6

检测项目	检测结果	检测项目	检测结果
总硬度	16.500	钙	1.800
溶解性总固体	474.000	镁	0.390
硫酸盐	253.000	砷	0.400×10^–3
氟化物	0.237	汞	＜0.040×10^–3
氯化物	20.500	铬	＜0.030
硝酸盐	0.272	铅	＜1.000×10^–3
钾	0.230	锌	＜9.000×10^–3
钠	110.000	铜	＜4.000×10^–3
镉	0.300×10^–3	钴	＜0.020
铁	0.470	镍	＜7.000×10^–3
锰mg/L	＜0.010	锑	＜0.070×10^–3