A detection method for the air leakage rate of the flue gas heat exchanger in the desulfurization unit of the thermal power plant

A technology of flue gas heat exchanger and desulfurization device, which can solve the problems of large measurement deviation and high humidity of flue gas, etc.

Active Publication Date: 2021-09-14
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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  • A detection method for the air leakage rate of the flue gas heat exchanger in the desulfurization unit of the thermal power plant

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Embodiment Construction

[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 for the air leakage rate of a flue gas heat exchanger of a desulfurization device in a thermal power plant. The detection method for the air leakage rate of a flue gas heat exchanger for a desulfurization device in a thermal power plant is based on an automatic online monitoring system for flue gas through an indirect measurement method , no need to add other measuring equipment, and it only takes about one hour to complete the measurement, which is very convenient for the power plant to monitor the air leakage rate of the flue gas heat exchanger daily, with high accuracy, changing the need to measure the air leakage rate of the flue gas heat exchanger in the past The mode carried out by the externally commissioned professional testing organization can grasp the status of the flue gas heat exchanger at any time, and can effectively guide the maintenance and adjustment of operating conditions. The invention is used in the field of air leakage rate detection of flue gas heat exchangers.

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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Patent Type & Authority Patents(China)
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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