Application Status and Existing Problem Analysis of the Natural Draft Cooling Towers With Flue Gas Injection Technology in Thermal Power Plants

doi:10.12096/j.2096-4528.pgt.23015

Abstract

Abstract:

Objectives The natural draft cooling towers with flue gas injection (NDCT-FGI) is a crucial retrofitting technique for enhancing the efficiency of thermal power plants. However, its operational impacts on existing systems are significant and cannot be overlooked. Therefore, the current status of NDCT-FGI technology and its problems in operation were analyzed, and the countermeasures were put forward. Methods Through comprehensive analysis of the existing research, the causes and formation mechanism of environmental impact, cooling tower corrosion, and deterioration of circulating cooling water quality caused by the technical transformation of NDCT-FGI were discussed. Results The protective distance can be reasonably set by the simulation results of flue gas emission trajectory and pollutant landing concentration by computational fluid dynamics (CFD). Installation of baffles at the tower top can prevent flue gas washdown during the extreme weather conditions. Different anticorrosive coatings are recommended for various parts of the cooling tower to extend its service life. To control and optimize cooling water quality, the advanced water treatment techniques are necessary for optimizing chemical dosing, and the management of effluent and makeup water must be carefully controlled to ensure operational sustainability. Conclusions By implementing appropriate and effective countermeasures, the negative impacts of NDCT-FGI retrofitting can be mitigated, thereby enhancing both the environmental and economic benefits for thermal power plants.

Key words: thermal power, cooling tower, smoke emission, environmental pollution, boiler, corrosion, desulphurization, denitration

CLC Number:

TK 09

Zhonglin XIA, Wentong CHEN, Shuqiao XU, Zhongsheng WU, Qiang XIE, Shuangchen MA, Jingxiang MA. Application Status and Existing Problem Analysis of the Natural Draft Cooling Towers With Flue Gas Injection Technology in Thermal Power Plants[J]. Power Generation Technology, 2024, 45(4): 590-599.

Figures/Tables 5

References 41

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大气状态	不同风速下烟气抬升高度/m
大气状态	0.5 m/s	1.5 m/s	3.0 m/s	4.5 m/s
不稳定	1 100	1 000	800	300
中性	750	300	200	150
稳定	250	150	120	80

大气状态	不同风速下烟气抬升高度/m
大气状态	0.5 m/s	1.5 m/s	3.0 m/s	4.5 m/s
不稳定	1 100	1 000	800	300
中性	750	300	200	150
稳定	250	150	120	80

参数	数值	参数	数值
电导率/(μS⋅cm^-1)	957	Cl^-质量浓度/(mg⋅L^-1)	30.00
pH值	2.55	NO₃^-质量浓度/(mg⋅L^-1)	2.50
Cu²⁺质量浓度/(mg⋅L^-1)	0.002 7	NO₂^-质量浓度/(mg⋅L^-1)	0.00
Fe³⁺质量浓度/(mg⋅L^-1)	25.48	SO₄^2-质量浓度/(mg⋅L^-1)	160.00
Fe²⁺质量浓度/(mg⋅L^-1)	2.30	SO₃^2-质量浓度/(mg⋅L^-1)	6.05
Al³⁺质量浓度/(mg⋅L^-1)	0.096 5	总硫质量浓度/(mg⋅L^-1)	59.38
Na⁺质量浓度/(mg⋅L^-1)	0.620 1	S^2-质量浓度/(mg⋅L^-1)	0.006 0
K⁺质量浓度/(mg⋅L^-1)	0.284 7	总磷质量浓度/(mg⋅L^-1)	0.007 5
Ba²⁺质量浓度/(mg⋅L^-1)	0.006 5	Ca²⁺质量浓度/(mg⋅L^-1)	1.185 0
Sr²⁺质量浓度/(mg⋅L^-1)	0.007 2	Mg²⁺质量浓度/(mg⋅L^-1)	0.281 5

参数	数值	参数	数值
电导率/(μS⋅cm^-1)	957	Cl^-质量浓度/(mg⋅L^-1)	30.00
pH值	2.55	NO₃^-质量浓度/(mg⋅L^-1)	2.50
Cu²⁺质量浓度/(mg⋅L^-1)	0.002 7	NO₂^-质量浓度/(mg⋅L^-1)	0.00
Fe³⁺质量浓度/(mg⋅L^-1)	25.48	SO₄^2-质量浓度/(mg⋅L^-1)	160.00
Fe²⁺质量浓度/(mg⋅L^-1)	2.30	SO₃^2-质量浓度/(mg⋅L^-1)	6.05
Al³⁺质量浓度/(mg⋅L^-1)	0.096 5	总硫质量浓度/(mg⋅L^-1)	59.38
Na⁺质量浓度/(mg⋅L^-1)	0.620 1	S^2-质量浓度/(mg⋅L^-1)	0.006 0
K⁺质量浓度/(mg⋅L^-1)	0.284 7	总磷质量浓度/(mg⋅L^-1)	0.007 5
Ba²⁺质量浓度/(mg⋅L^-1)	0.006 5	Ca²⁺质量浓度/(mg⋅L^-1)	1.185 0
Sr²⁺质量浓度/(mg⋅L^-1)	0.007 2	Mg²⁺质量浓度/(mg⋅L^-1)	0.281 5

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