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All-level boiler heating surface flue-gas temperature determination method and device

A technology of flue gas temperature and heating surface, applied in the field of boilers, can solve problems such as inaccuracy

Inactive Publication Date: 2015-09-09
NORTH CHINA ELECTRICAL POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, there is no method for estimating the flue gas temperature in the prior art, but it is assumed that the flue gas temperature is used to estimate the temperature of the working medium. The assumed flue gas temperature in the prior art is not accurate. Therefore, it is necessary to establish a The on-line measurement method of flue gas on the heating surface of each level can accurately obtain the temperature of the flue gas on the heating surface of the boiler at all levels

Method used

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  • All-level boiler heating surface flue-gas temperature determination method and device
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  • All-level boiler heating surface flue-gas temperature determination method and device

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Embodiment Construction

[0082] 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.

[0083] The inventor found that the temperature and pressure of the working medium at the inlet and outlet of the heating surface of the boiler at all levels are already on the DCS dial. The gas temperature will be more accurate than the flue gas temperature of the heating surface of the boiler at all levels assumed in the prior art. Based on this, an embodiment of the present invention provides a method for determining flue gas temperatures on heating surfaces of boilers at various stages.

[0084] figure 1 It is a schematic diagram of the method for determining the...

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Abstract

The invention discloses an all-level boiler heating surface flue-gas temperature determination method and device. The method includes: determining enthalpy values of all-level boiler heating surface inlet-outlet working media according to temperature and pressure of the all-level boiler heating surface inlet-outlet working media on a DCS (distributed controls system) dial; determining heat absorption capacity of the all-level boiler heating surface inlet-outlet working media according to the enthalpy values of the all-level boiler heating surface inlet-outlet working media, steam flow in the heating surfaces and calculated fuel consumption; determining flue-gas heat release of all-level boiler heating surface inlets and outlets according to the heat absorption capacity of the all-level boiler heating surface inlet-outlet working media; determining flue-gas temperature difference of the all-level boiler heating surface inlets and outlets according to the flue-gas heat release of the all-level boiler heating surface inlets and outlets, flue gas flow, actual flue gas volume and specific heat at constant pressure of flue gas; based on flue gas temperature of a coal economizer inlet, and determining flue gas temperature of the all-level boiler heating surface inlets and outlets according to the flue gas temperature difference of the all-level boiler heating surface inlets and outlets. By the method and device, the flue-gas temperature of the all-level boiler heating surfaces can be acquired accurately.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a method and a device for determining flue gas temperatures on heating surfaces of boilers at various levels. Background technique [0002] Economizers, superheaters, reheaters and other equipment are important components of the boiler, and maintaining a stable temperature on the heating surface is necessary to ensure the safe and economical operation of the unit. However, during the operation of the boiler, a non-uniform temperature field is often formed inside, resulting in deviation of heat absorption on the heating surface, and even a tube burst in severe cases. Therefore, it is very necessary to monitor the temperature of the working medium and flue gas on the heating surface at all levels. [0003] In the prior art, the temperature of the working fluid on the heating surface at all levels can be obtained by the following method: [0004] 1. Assume the flue gas temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B35/00
Inventor 赵振宁张清峰李媛园李金晶
Owner NORTH CHINA ELECTRICAL POWER RES INST
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