Detection method of thermal power plant desulfurization device flue gas heat exchanger air leakage rate

A technology of flue gas heat exchanger and desulfurization device, which can solve the problems of high flue gas humidity and large measurement deviation by detecting the appearance of fluid at the leakage point and measuring the liquid tightness by using liquid/vacuum degree. Achieve high accuracy and facilitate measurement and supervision

Active Publication Date: 2019-09-27
广州珠江电力有限公司 +2
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Problems solved by technology

[0004] At present, the power plant mainly outsources third-party professional testing units to measure the air leakage rate of the flue gas heat exchanger after the new installation of the flue gas heat exchanger in the desulfurization unit or after the heat exchange element has been modified on the flue gas heat exchanger. , using professional flue gas analyzers and sampling equipment, the sampling equipment needs to be cooled to remove water first, and the pipeline is kept warm throughout the process, mainly because the humidity of the flue gas after desulfurization is extremely high, and a small amount of condensed water will dissolve SO 2 , so that the measurement deviation is large

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  • Detection method of thermal power plant desulfurization device flue gas heat exchanger air leakage rate

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[0012] refer to figure 1 , the invention is a detection method for the air leakage rate of the flue gas heat exchanger of the desulfurization device of the thermal power plant, through the method of indirect measurement, the SO in the net flue gas 2 Equal to SO at the outlet of the absorption tower 2 The total amount plus the SO leaked from the raw flue gas into the clean flue gas 2 total amount. Among them, the original flue gas flow A 1 , net flue gas flow A 2 , SO at the outlet of the absorption tower 2 Concentration a, net flue gas SO 2 Concentration b, raw flue gas SO 2 Concentration c, air leakage rate x, A 2 ×a+A 1 ×x×c=A 2 ×b, get x=A 2 (b-a) / cA 1 , so in order to calculate the air leakage rate x, the key is to accurately measure the SO at the outlet of the absorption tower 2 Concentration a, and other parameters can be directly read through the smoke automatic online monitoring system 2.

[0013] Measurement of SO at the outlet of the absorption tower 2 ...

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Abstract

The invention discloses a detection method of thermal power plant desulfurization device flue gas heat exchanger air leakage rate. According to the detection method of the thermal power plant desulfurization device flue gas heat exchanger air leakage rate, it only takes about one hour to complete measurement through an indirect measurement method based on a flue gas automatic on-line monitoring system without additional arrangement of other measuring equipment so that the air leakage rate of the flue gas heat exchanger of the power plant can be conveniently measured and supervised in daily time, the accuracy is high, the mode that the air leakage rate of the flue gas heat exchanger is measured by the subcontracting professional testing organization before can be changed, the condition of the flue gas heat exchanger can be mastered at any time and the maintenance and operation condition adjustment can be effectively guided. The detection method is used for the field of detecting the air leakage rate of the flue gas heat exchanger.

Description

technical field [0001] The invention relates to the field of detecting the air leakage rate of a flue gas heat exchanger, in particular to a method for detecting the air leakage rate of a flue gas heat exchanger of a desulfurization device in a thermal power plant. Background technique [0002] In order to increase the exhaust temperature of flue gas after desulfurization in thermal power plants and reduce the 3 The acid mist formed when the temperature reaches the dew point will corrode the tail flue and chimney, and avoid the formation of white smoke plume. Most power plants use a flue gas heat exchanger when choosing a technical route, that is, using the original flue gas entering the absorption tower, the temperature reaches 130°C, the temperature of the net flue gas after heating and desulfurization and washing is only about 50°C, and the temperature of the net flue gas is raised to above 80°C and then discharged into the atmosphere through the chimney. However, the po...

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Application Information

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IPC IPC(8): G01M3/20
CPCG01M3/20
Inventor 陈贵华
Owner 广州珠江电力有限公司
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