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Method and device for determining air leakage rate of air pre-heater

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: 2015-11-11
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 pre-heater
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  • Method and device for determining air leakage rate of air pre-heater

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Embodiment Construction

[0031] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention.

[0032] figure 1 This is a schematic diagram of a method for determining the air leakage rate of an air preheater according to an embodiment of the present invention. like figure 1 As shown, the method for determining the air leakage rate of the air preheater in the embodiment of the present invention may include:

[0033] Step 101, obtaining the average oxygen amount at the inlet of the air preheater;

[0034] Step 102: Determine the excess air coefficient at the outlet of the air preheater according to the average oxygen amount at the inlet of th...

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Abstract

The invention discloses a method and device for determining the air leakage rate of an air pre-heater. The air pre-heater is dual-chamber air pre-heater or four-chamber air pre-heater. The method comprises: acquiring the inlet average oxygen content of the air pre-heater; determining an outlet excess air coefficient of the air pre-heater according to the inlet average oxygen content of the air pre-heater; determining an inlet excess air coefficient of the air pre-heater according to the outlet excess air coefficient of the air pre-heater; determining the leakage-free outlet flue gas temperature of the air pre-heater according to the inlet flue gas temperature of the air pre-heater, the outlet primary air temperature of the air pre-heater, the outlet secondary air temperature of the air pre-heater, the inlet primary air temperature of the air pre-heater, and the inlet secondary air temperature of the air pre-heater; determining the flue gas air leakage temperature of the air pre-heater according to secondary air temperature; determining the outlet air leakage coefficient increment of the air pre-heater according to the leakage-free outlet flue gas temperature of the air pre-heater, a real boiler exhaust gas temperature, and the flue gas air leakage temperature of the air pre-heater; and determining the air leakage rate of the air pre-heater according to the outlet air leakage coefficient increment of the air pre-heater and the inlet excess air coefficient of the air pre-heater. The method and the device may accurately acquire the air leakage rate of the air pre-heater.

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 preheater (airpre-heater) is the 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 the coal-fired thermal power plant, and the air leakage rate of the air preheater can be determined by the test method. 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 input and output are calculate...

Claims

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Application Information

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Patent Type & Authority Applications(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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