Supercritical carbon dioxide boiler cooling wall matched with non-uniform thermal load

A carbon dioxide and cooling wall technology, applied in steam boilers, lighting and heating equipment, combustion methods, etc., can solve the problems of reducing the maximum temperature of the pipe wall, reducing the circumferential temperature difference of the cooling pipe wall, etc., to reduce the circumferential temperature difference of the wall, The effect of prolonging the effective life and reducing the circumferential stress

Active Publication Date: 2022-04-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] lead to S-CO 2 One of the main reasons for boiler cooling wall overheating tube burst is that the circumferential stress caused by the uneven heating of the cooling wall tube bundle and the maximum tube wall temperature is higher than the allowable temperature of the material, so control or solve the cooling wall overtemperature For the problem of pipe burst, it is necessary to grasp the distribution law of non-uniform heat load on the pipe wall, strengthen the heat transfer capacity of the cooling pipe under the circumferential non-uniform heat flow, reduce the circumferential temperature difference of the cooling pipe wall, and reduce the maximum temperature of the pipe wall

Method used

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  • Supercritical carbon dioxide boiler cooling wall matched with non-uniform thermal load
  • Supercritical carbon dioxide boiler cooling wall matched with non-uniform thermal load
  • Supercritical carbon dioxide boiler cooling wall matched with non-uniform thermal load

Examples

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Effect test

Embodiment 1

[0051] The maximum proportion of radiative heat transfer in furnace heat transfer reaches 95%. Each cooling stave tube has a fire side and a backfire side. The radiant heat transfer to the fire side tube wall is the largest, and it gradually decreases along the two sides of the tube wall. Small until the heat radiation received by the backfire side is minimal. The thickness of the traditional cooling wall tube wall is the same, which cannot be well adapted to the actual working conditions of circumferential non-uniform heat transfer, resulting in a large circumferential temperature difference of the tube wall, resulting in a large circumferential stress, which is not conducive to the long-term safe use of the tube, and the opposite fire The heat exchange effect at the maximum heat radiation on the side is not good enough, which leads to the high temperature of the maximum tube wall, which is prone to over-temperature tube explosion, which affects the safe operation. In additio...

Embodiment 2

[0070] In this embodiment, a supercritical carbon dioxide boiler cooling wall matching the non-uniform heat load of the above-mentioned embodiment 1 is used to form a supercritical carbon dioxide boiler cooling chamber, which is used as S-CO 2 Boiler cooling.

[0071] A second aspect of the present application provides a supercritical carbon dioxide boiler cooling chamber, comprising:

[0072] The above-mentioned supercritical carbon dioxide boiler cooling wall matched with non-uniform heat load, the supercritical carbon dioxide boiler cooling chamber is composed of the boiler cooling wall enclosed;

[0073] The furnace flame area is composed of the flame ejected by the boiler furnace burner, and the thermal radiation energy is absorbed by the cooling wall of the eccentric tube around the boiler.

[0074] As an optional embodiment of the present application, optionally, the cooling chamber of the supercritical carbon dioxide boiler includes:

[0075] The front wall cooling w...

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Abstract

The invention discloses a supercritical carbon dioxide boiler cooling wall matched with non-uniform thermal load, which comprises a plurality of cooling pipes uniformly arranged on the inner wall surface of a supercritical carbon dioxide boiler, the cooling pipes are eccentric pipes, and the eccentricity ratio of the eccentric pipes is in positive correlation with the thermal load of the eccentric pipes. The working conditions of non-uniform thermal load in the circumferential direction of the cooling wall and non-uniform thermal load distribution in the width direction of the hearth are considered, the eccentric cooling wall pipes are adopted to strengthen heat exchange towards the fire side, and the eccentricity rates of the eccentric cooling wall pipes in different thermal load areas are reasonably arranged to be matched with thermal load distribution of the heating surfaces of the hearths, so that the heat exchange efficiency is improved, and the energy consumption is reduced. And meanwhile, the reduction of the highest wall temperature is also beneficial to guaranteeing the safe and efficient operation of the boiler, the convection heat exchange effect of the fire-facing side is enhanced, and the circumferential temperature difference of the wall of the cooling pipe is effectively reduced. The eccentric pipes with different eccentricity rates are adopted, so that the circumferential stress and the over-temperature pipe explosion phenomenon are reduced, and the effective service life of the pipeline is prolonged.

Description

technical field [0001] The present application relates to the technical field of coal-fired power generation in supercritical carbon dioxide boilers, and in particular, to a supercritical carbon dioxide boiler cooling stave matched with non-uniform heat loads. Background technique [0002] Carbon dioxide, as a natural fluid for boiler cooling stave matching non-uniform heat load, is non-toxic, non-flammable, colorless and odorless. CO 2 It has better stability, less corrosiveness to metals, and CO 2 The critical parameter is lower, and it is easier to reach the supercritical parameter. These inherent advantages make it possible to replace steam as a new heat transfer medium for coal-fired power plants. Today, coal-fired power generation in China still occupies a dominant position, and the basic fact that coal-fired power is the main power source for power generation in my country remains unchanged. Therefore, S-CO used in coal-fired power generation 2 The power cycle ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23M5/08F22B3/08F22B31/08
CPCF23M5/08F22B3/08F22B31/08
Inventor 王艳娟高硕陈哲文于滨汇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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