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Method for testing air leak rate of air preheater

A technology of air preheater and test method, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of complicated implementation, affecting the accuracy of test results, and measurement lag, etc.

Active Publication Date: 2014-03-12
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Abstract
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Problems solved by technology

The implementation of this test method is relatively complicated, requiring special instruments, and because the flue gas composition (such as oxygen content, etc.) may fluctuate greatly during boiler operation, it has strict requirements on the operating state, which also affects the test. accuracy of results
Because the on-line instrumentation of flue gas oxygen content has a certain measurement lag, using on-site on-line instrumentation to estimate the air leakage rate sometimes brings large errors
In addition, the resolution of the oxygen analysis instrument is generally 0.1% of the oxygen content, and the oxygen content of the flue gas is generally about 5% to 7%, so the relative accuracy of the oxygen measurement is about 2%, which also affects the air preheating. Test accuracy of air leakage rate of heater

Method used

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  • Method for testing air leak rate of air preheater
  • Method for testing air leak rate of air preheater
  • Method for testing air leak rate of air preheater

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Embodiment Construction

[0071] The present invention will be further described below in conjunction with embodiments.

[0072] A test method for air leakage rate of air preheater, its steps are:

[0073] 1) Measure the exhaust gas temperature θ of the air preheater py And the air temperature TK entering the air preheater in ;

[0074] 2) Use formula m l m y = C y ( θ 0 , py - θ py ) C k ( θ py - TK in ) = α ( θ 0 , py - θ py ) ( θ py - TK in ) - - - ( 2 )

[0075] Where That is the air leakage rate of the air preheater, the specific heat C k And C y Calculate by fitting formula or check by chart, Is the ratio of specific heat of flue gas to specific heat of air;

[0076] m l , M y They are the air quality leaking into the flue gas from the air preheater and the flue gas quality entering the air preheater;

[0077] C k Air at temperature TK in To temperature ...

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Abstract

The invention relates to a method for testing the air leak rate of an air preheater, which is easy to implement, accurate and reliable and is suitable for analyzing and testing the air preheater. The accuracy of temperature measurement can reach 0.1 DEG C, the smoke venting temperature is within the range of between 100 and 200 DEG C approximately, and when a boiler runs stably, the smoke venting temperature is constant basically, so the relative accuracy of the temperature measurement is higher than the analytic accuracy of the oxygen content of smoke. Therefore the air leak rate, which is calculated according to the change of the smoke venting temperature, of the air preheater has the higher test accuracy. The method comprises the following steps of: 1) measuring the smoke venting temperature theta py of the air preheater and the temperature TKin of air entering the air preheater; and 2) utilizing a formula, namely when the change of the air leak rate is needed to be monitored due to the change of the air leak rate with the change of the running condition or equipment condition of the air preheater, measuring the air temperature TKin and the smoke venting temperature thetapy in the running state, which corresponds to the temperature thetapy, of the boiler, and calculating the air leak rate AL by the formula.

Description

Technical field [0001] The invention relates to a method for testing the air leakage rate of an air preheater. Background technique [0002] Air preheater (referred to as air preheater) is an important equipment for large boilers. In the air preheater, the flue gas transfers heat to the air, and the temperature of the flue gas decreases after the heat is released, leaving the air preheater to become the exhaust smoke of the boiler. Large-scale power station boilers generally use rotary air preheaters, and the heat storage element rotates at a certain speed to periodically exchange heat with flue gas and air. Because the rotational movement of the heat storage element (rotor) in the rotary air preheater requires a certain dynamic and static clearance, and the flue gas in the rotary air preheater is in a negative pressure state, and the air is in a positive pressure state, so there will be Part of the air leaks into the flue gas and exits the air preheater with the flue gas. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
Inventor 杨兴森郝卫东
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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