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Method for calculating supercritical reverse-flow economizer process heat transfer coefficient

A technology of heat transfer coefficient and economizer, which is applied in the field of calculation of heat transfer coefficient of supercritical counter-flow economizer process

Pending Publication Date: 2021-09-10
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

[0004] Problems and defects in the existing heat transfer calculation method for supercritical once-through boiler economizer

Method used

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  • Method for calculating supercritical reverse-flow economizer process heat transfer coefficient
  • Method for calculating supercritical reverse-flow economizer process heat transfer coefficient
  • Method for calculating supercritical reverse-flow economizer process heat transfer coefficient

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with accompanying drawing and example.

[0038] refer to Figure 1 ~ Figure 3 , a method for calculating the heat transfer coefficient of a supercritical counterflow economizer process of the present invention, comprising the following:

[0039] (a) Simplification and assumptions of the mathematical model of heat transfer of counterflow economizer

[0040] The schematic diagram of the heat transfer of the counter-flow economizer is as follows: figure 1 shown. Before constructing the mathematical model for calculating the heat transfer of the countercurrent economizer, it is necessary to make the following assumptions about the heat transfer process of the economizer: (1) The mass flow rate q of the hot and cold fluids in the model m1 ,q m2 It is constant on the entire heat exchange surface; (2) the heat dissipation coefficient in the model is constant on the entire heat exchange surface of the econ...

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Abstract

The invention relates to a method for calculating the supercritical reverse-flow economizer process heat transfer coefficient, which is characterized by comprising two steps of reasonably simplifying and assuming a heat transfer process of the economizer and calculating a heat transfer coefficient of an infinitesimal section economizer. According to the method, a whole economizer is subjected to grid division, the change of physical property parameters of feed water along with the temperature is considered, and then heat transfer parameters during operation of each infinitesimal section are solved through an energy balance method and a heat transfer equation. The purpose of accurately calculating the heat transfer coefficient in the process heat transfer of a supercritical reverse-flow economizer is achieved, and the problem that the process heat transfer coefficient of a supercritical reverse-flow economizer cannot be calculated is solved.

Description

technical field [0001] The invention relates to the field of thermal equipment performance state monitoring and diagnosis, in particular to a method for calculating the process heat transfer coefficient of a supercritical countercurrent economizer. Background technique [0002] At present, more and more coal-fired power plants are installing low-temperature economizers or even low-temperature economizers to reduce the exhaust gas temperature of boilers, so as to achieve the purpose of deep utilization of waste heat and energy saving and emission reduction. Usually, the evaluation method of waste heat recovery and utilization performance after the addition of an economizer is mainly calculated by means of the thermal calculation method of the heat exchanger in the traditional boiler thermal calculation standard, that is, the boiler thermal calculation standard 1973 edition and 1976 edition. However, the traditional thermal calculation method of boiler heat exchanger considers...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/11G06F30/20G06F111/10G06F119/08
CPCG06F17/11G06F30/20G06F2111/10G06F2119/08
Inventor 王艳红毛天秦李晓雨姜铁骝胡鹏飞李琪曹丽华洪文鹏司和勇王占洲
Owner NORTHEAST DIANLI UNIVERSITY
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