Influencing Factors and Water Saving Effect Analysis of Slurry Cooling Flue Gas De-whitening Design

doi:10.12096/j.2096-4528.pgt.19020

Abstract

Abstract:

In order to rationally select the design parameters of slurry cooling flue gas de-whitening and evaluate its water saving effect. The reasons for the formation of flue gas wet plume, the influencing factors and the principle of slurry cooling flue gas de-whitening was introduced in this paper. The effect of flue gas temperature on heat exchanger heat transfer load and the effect of water temperature on circulating cooling water volume were analyzed. Based on the analysis of the factors affecting the water balance of the desulfurization system, a calculation method for the water balance of the desulfurization system based on the design coal parameters and liquid ammonia consumption was proposed. The water balance process design of the desulfurization system was given. The water saving effect of the flue gas de-whitening process of 320MW unit was analyzed. The results show that the water-saving efficiency can reach as high as 49.0% even under extreme high temperature conditions of 40℃.

Key words: wet smoke plume, slurry cooling, flue gas de-whitening, water balance, heat exchanger

CLC Number:

TK09
TM621

Donglei WANG. Influencing Factors and Water Saving Effect Analysis of Slurry Cooling Flue Gas De-whitening Design[J]. Power Generation Technology, 2021, 42(3): 382-388.

Figures/Tables 7

References 17

1	李庚陆. 河北燃煤电厂烟囱有色烟羽治理技术路线探讨[J]. 工业C, 2018, 10 (6): 177- 178.
	LI G L . Discussion on technical route of non-ferrous plume treatment for chimney of coal-fired power plant in Hebei[J]. Industry C, 2018, 10 (6): 177- 178.
2	王争荣, 耿宣, 汪洋, 等. 燃煤电厂湿烟羽消除设计方案对比分析[J]. 华电技术, 2018, 40 (9): 5- 9. DOI
	WANG Z R , GENG X , WANG Y , et al. Comparative analysis of design schemes for wet flue gas elimination in coal-fired power plants[J]. Huadian Technology, 2018, 40 (9): 5- 9. DOI
3	熊英莹, 谭厚章, 许伟刚, 等. 火电厂烟气潜热和凝结水回收的试验研究[J]. 热力发电, 2015, 44 (6): 77- 81. DOI
	XIONG Y Y , TAN H Z , XU W G , et al. Experimental study on latent heat and condensate recovery from flue gas in coal-fired power plants[J]. Thermal Power Generation, 2015, 44 (6): 77- 81. DOI
4	刘华, 周贤, 付林. 烟气与水冷凝换热器影响因素实验研究[J]. 暖通空调, 2015, 45 (7): 90- 95.
	LIU H , ZHOU X , FU L . Experimental research on influence factors of direct-contact flue-gas-water condensation heat exchange[J]. Heating Ventilating & Air Conditioning, 2015, 45 (7): 90- 95.
5	周洪光. 如何正确认识火电厂湿烟气排放及白雾现象[J]. 环境工程, 2015, 33 (S1): 433- 437.
	ZHOU H G . A correct understanding of the wet flue gas emission and white spray phenomenon in coal-fired power plants[J]. Environmental Engineering, 2015, 33 (S1): 433- 437.
6	邓骥, 魏芳. 湿法烟气脱硫过程白烟成因及防治措施分析[J]. 石油与天然气化工, 2016, 46 (2): 17- 21.
	DENG J , WEI F . Analysis of causes and prevention measures of white smoke in wet flue gas desulfurization process[J]. Chemical Engineering of Oil & Gas, 2016, 46 (2): 17- 21.
7	马修元, 惠润堂, 杨爱勇, 等. 湿烟羽形成机理与消散技术数值分析[J]. 科学技术与工程, 2017, 17 (22): 220- 224. DOI
	MA X Y , HUI R T , YANG A Y , et al. Numerical analysis of wet plume formation mechanism and dissipation technique[J]. Science Technology and Engineering, 2017, 17 (22): 220- 224. DOI
8	谭玲君, 赵晓峰, 梁增英, 等. 垃圾焚烧发电厂白烟成因及其分析[J]. 环境科学与技术, 2014, 37 (120): 483- 485.
	TAN L J , ZHAO X F , LIANG Z Y , et al. Analysis of the whiter smoke problem in waste incineration power plant[J]. Environmental Science & Technology, 2014, 37 (120): 483- 485.
9	袁园. 火电厂湿法脱硫运行经济性分析与第三方治理[J]. 电力科学与工程, 2016, 32 (1): 27- 30. DOI
	YUAN Y . Economic analysis of wet FGD of thermal power plant and third-party management[J]. Electric Power Science and Engineering, 2016, 32 (1): 27- 30. DOI
10	刘志坦, 惠润堂, 杨爱勇, 等. 燃煤电厂湿烟羽成因及对策研究[J]. 环境与发展, 2017, 29 (10): 43- 46.
	LIU Z T , HUI R T , YANG A Y , et al. Study on cause and countermeasures of wet smoke feather in coal-fired power plant[J]. Environment & Development, 2017, 29 (10): 43- 46.
11	蔡继东, 万忠诚, 张庭怿. 燃煤电厂脱硫废水零排放工程的设计与应用[J]. 广东电力, 2018, 31 (5): 28- 34.
	CAI J D , WAN Z C , ZHANG T Y . Design and application of desulfurization wastewater zero discharging project of coal-fired power plant[J]. Guangdong Electric Power, 2018, 31 (5): 28- 34.
12	赵文升, 刘英. 国华台山电厂烟囱消除白雾的研究与应用[J]. 军民两用技术与产品, 2015, (4): 177- 180. DOI
	ZHAO W S , LIU Y . Research and application of eliminating white mist in chimney of Guohua Taishan power plant[J]. Dual Use Technologies & Products, 2015, (4): 177- 180. DOI
13	李章东, 刘世堂. 浅谈降低锅炉排烟温度措施及效益[J]. 科技创新, 2016, 4 (7): 55. DOI
	LI Z D , LIU S T . Talking about measures and benefits of reducing boiler flue gas temperature[J]. Science and Technology Innovation, 2016, 4 (7): 55. DOI
14	裘立春. 大型燃煤电站锅炉冒白烟的研究[J]. 锅炉技术, 2015, 46 (3): 26- 29. DOI
	QIU L C . The research on stack white fume in large utility boiler burning coal[J]. Boiler Technology, 2015, 46 (3): 26- 29. DOI
15	LEVY E, BILIRGEN H, DUPOINT J. Recovery of water from boiler flue gas using condensing heat exchanger[R]. Bethlehem: Lehigh University, 2011.
16	杨柳, 金定强, 吕留根. 脱硫除雾器冲洗喷嘴冲洗特性试验研究[J]. 环境工程学报, 2008, 2 (1): 140- 143.
	YANG L , JIN D Q , LÜ L G . Experimental study on flushing characteristics of flushing nozzles of demister in desulfurization system[J]. Chinese Journal of Environmental Engineering, 2008, 2 (1): 140- 143.
17	腾宗礼, 王宇忠, 邢希运. 冷却塔蒸发损失水量计算方法探讨[J]. 工业用水与废水, 2014, 45 (5): 65- 67. DOI
	TENG Z L , WANG Y Z , XING X Y . Discussion on calculating method of evaporation loss quantity of cooling tower[J]. Industrial Water & Wastewater, 2014, 45 (5): 65- 67. DOI

排烟初始温度/℃	换热负荷/MW
排烟初始温度/℃	夏季(排烟温度47℃)	冬季(排烟温度45℃)
54	99.0	-
53	82.5	-
52	65.6	-
51	52.1	-
50	38.5	60.6
49	24.7	47.2
48	12.0	34.5
47	-	22.4
46	-	10.9

排烟初始温度/℃	换热负荷/MW
排烟初始温度/℃	夏季(排烟温度47℃)	冬季(排烟温度45℃)
54	99.0	-
53	82.5	-
52	65.6	-
51	52.1	-
50	38.5	60.6
49	24.7	47.2
48	12.0	34.5
47	-	22.4
46	-	10.9

换热负荷/MW	冷却水温度/℃	循环冷却水水量/(t·h^-1)
15.1	34	3 170
15.1	33	2 550
15.1	32	2 130
15.1	31	1 830
15.1	30	1 600

换热负荷/MW	冷却水温度/℃	循环冷却水水量/(t·h^-1)
15.1	34	3 170
15.1	33	2 550
15.1	32	2 130
15.1	31	1 830
15.1	30	1 600

项目	H元素质量分数%				水分质量分数/%
项目	3	4	5	6	5	10	15	20
水蒸气生成量/(t·h^-1)	114.8	153.1	191.3	229.6	20.8	41.5	62.3	83.0