Method and device for determining air leakage rate of air preheater

A technology of air preheater and air leakage rate, applied in the field of boilers, can solve problems such as unmeasured and deviation, and achieve the effect of avoiding high error and accurate air leakage rate of air preheater.

Active Publication Date: 2017-05-10
NORTH CHINA ELECTRICAL POWER RES INST +1
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Problems solved by technology

However, due to the inhomogeneity of the oxygen content here, if there is a local high-oxygen flow at the measuring point, or if the local high-gas flow cannot be measured, it will cause huge deviations

Method used

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  • Method and device for determining air leakage rate of air preheater
  • Method and device for determining air leakage rate of air preheater
  • Method and device for determining air leakage rate of air preheater

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Embodiment Construction

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0035] figure 1 It is a schematic diagram of the method for determining the air leakage rate of the air preheater in the embodiment of the present invention. Such as figure 1 As shown, the air preheater air leakage rate determination method in the embodiment of the present invention may include:

[0036] Step 101, obtaining the average oxygen amount at the inlet of the air preheater;

[0037] Step 102, according to the average oxygen quantity at the inlet of the air preheater, determine the excess air coefficient at the outlet of the air preheater;

[0038] Step 1...

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Abstract

The invention discloses an air preheater air leakage rate determination method and a device. The air preheater is a tri-section air preheater. The method comprises steps: an average oxygen content at the inlet of the air preheater is acquired; according to the average oxygen content at the inlet of the air preheater, an excess air coefficient at the outlet of the air preheater is determined; according to the excess air coefficient at the outlet of the air preheater, an excess air coefficient at the inlet of the air preheater is determined; according to smoke temperature at the inlet of the air preheater, primary air temperature at the outlet of the air preheater, secondary air temperature at the outlet of the air preheater, primary air temperature at the inlet of the air preheater and secondary air temperature at the inlet of the air preheater, smoke temperature at the non-air leakage outlet of the air preheater is determined; according to the primary air temperature and the secondary air temperature, the air leakage temperature of the air preheater is determined; according to the smoke temperature at the non-air leakage outlet of the air preheater, the actual smoke exhaust temperature of a boiler and the air leakage temperature of the air preheater, the air leakage coefficient increment at the outlet of the air preheater is determined; and according to the air leakage coefficient increment at the outlet of the air preheater and the excess air coefficient at the inlet of the air preheater, the air leakage rate of the air preheater is determined. Thus, the air leakage rate of the air preheater can be accurately acquired.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a method and a device for determining the air leakage rate of an air preheater. Background technique [0002] The air pre-heater is a heating surface where the flue gas in the boiler tail flue passes through the internal heat sink to preheat the air before entering the boiler to a certain temperature, which is used to improve the heat exchange performance of the boiler and reduce energy consumption , generally referred to as air preheater. [0003] The air preheater is the main auxiliary equipment of coal-fired thermal power plants, and the air leakage rate of the air preheater can be determined through experiments. When determining the air leakage rate of the air preheater, the outlet and inlet of the flue gas side are arranged with dense measuring points according to the grid method. After measuring the oxygen amount, the oxygen amount in and out is calculated according to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/26
Inventor 赵振宁张清峰李金晶李媛园
Owner NORTH CHINA ELECTRICAL POWER RES INST
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