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Supercritical carbon dioxide coal-fired boiler system and its flue-air coupling three-dimensional circulation process

A carbon dioxide, coal-fired boiler technology, applied in the direction of non-flammable liquid/gas transportation, combustion chamber, combustion type, etc., can solve the problem of protecting supercritical carbon dioxide boilers prone to over-temperature areas and supercritical carbon dioxide boiler furnaces in a large range. Problems such as increased wall temperature and difficulty in controlling the air volume attached to the wall

Active Publication Date: 2021-04-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, part of the secondary air is usually passed into the furnace through the wall-adjacent air nozzle or the hole opened by the fins between the wall tubes to form the wall-adhesive air, which can protect a small range, and the wall-adhesive air volume is difficult to control. If the amount of secondary air injected into the center of the furnace is reduced, the amount of oxygen injected into the center of the furnace will decrease, and the combustion efficiency will decrease; and the temperature of the overall furnace wall of the supercritical carbon dioxide boiler will increase sharply, and the use of wall-attached wind cannot protect a wide range The easily overheated area of ​​supercritical carbon dioxide boiler

Method used

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  • Supercritical carbon dioxide coal-fired boiler system and its flue-air coupling three-dimensional circulation process
  • Supercritical carbon dioxide coal-fired boiler system and its flue-air coupling three-dimensional circulation process
  • Supercritical carbon dioxide coal-fired boiler system and its flue-air coupling three-dimensional circulation process

Examples

Experimental program
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Effect test

Embodiment 1

[0078] The supercritical carbon dioxide coal-fired boiler described in this embodiment adopts a Π-type furnace, and the furnace of the Π-type furnace includes a small furnace section, an intermediate transition section and a large furnace section sequentially connected from bottom to top, and the diameter of the large furnace section is a small furnace 1.2 times that of the section, the middle transition section is a truncated cone, the cross-sectional area of ​​the middle transition section gradually increases from bottom to top, and the angle between the side wall and the horizontal plane is 45°, and the small furnace section is equipped with The lower combined air nozzle, the connection between the small furnace section and the middle transition section is provided with a middle combined air nozzle, and the connection between the middle transition section and the large furnace section is provided with an upper combined air nozzle.

[0079] The small furnace section is provid...

Embodiment 2

[0082] Different from Example 1, the supercritical carbon dioxide coal-fired boiler mixes 50% of the recirculation flue gas flowing through the recirculation fan with the SOFA wind under the condition of 70% THA, and 50% of the recirculation flue gas is mixed with the SOFA wind. Primary wind, secondary wind and OFA wind are mixed. Among them, the air volume ejected from the upper combined air nozzle 173 is 5% of the sum of the primary air, secondary air, and recirculated flue gas air volume, and the air volume ejected from the middle combined air nozzle 172 is 5% of the primary air, secondary air, and recirculated smoke. 10% of the sum of air volume, and the air volume ejected from the lower combined air nozzle 171 accounts for 20% of the sum of primary air, secondary air, and recirculation flue gas air volume, measuring the small furnace section, intermediate transition section and large furnace section of the boiler The maximum wall temperature, which measures the boiler com...

Embodiment 3

[0084] Different from Example 1, the supercritical carbon dioxide coal-fired boiler mixes 60% of the recirculation flue gas flowing through the recirculation fan with the SOFA wind under the 45% THA working condition, and 40% of the recirculation flue gas is mixed with the SOFA wind. Primary wind, secondary wind and OFA wind are mixed. Among them, the air volume ejected from the upper combined air nozzle 173 is 5% of the sum of the primary air, secondary air, and recirculated flue gas air volume, and the air volume ejected from the middle combined air nozzle 172 is 5% of the primary air, secondary air, and recirculated smoke. 5% of the sum of air volume, and the air volume ejected from the lower combined air nozzle 171 accounts for 15% of the sum of primary air, secondary air, and recirculation flue gas air volume, measuring the small furnace section, intermediate transition section and large furnace section of the boiler The maximum wall temperature, which measures the boiler...

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Abstract

The invention discloses a supercritical carbon dioxide coal-fired boiler system and its flue-air coupling three-dimensional circulation process. The coal-fired boiler system includes a furnace, a flue, a secondary fan and a recirculation flue. There is a combined air nozzle, one end of the flue communicates with the upper end of the furnace, the air outlet of the secondary fan communicates with the combined air nozzle through an air volume control valve, and the air inlet end of the recirculation flue communicates with the upper end of the furnace. The flue is connected, and the outlet end of the recirculation flue is connected with the combined air nozzle through the flue gas volume control valve. A recirculation fan is provided on the recirculation flue, and the recirculation fan is used to The flue extracts flue gas. The supercritical carbon dioxide coal-fired boiler system described in this application can ensure the combustion efficiency of the coal-fired boiler, and effectively alleviate the high-temperature corrosion and coking and slagging of the wall surface.

Description

technical field [0001] The invention relates to the technical field of supercritical carbon dioxide coal-fired boilers, in particular to a supercritical carbon dioxide coal-fired boiler system and a three-dimensional circulation process for coupling smoke and wind. Background technique [0002] Supercritical carbon dioxide power cycles have received extensive research and attention in the fields of solar energy, nuclear energy, gas turbines, and thermal power generation. However, due to material limitations, it is difficult to further improve the efficiency of conventional steam Rankine cycle coal-fired units, while supercritical carbon dioxide coal-fired units However, it can achieve a net efficiency increase of about 3-5% under the same export working fluid parameters. [0003] The heat transfer coefficient of supercritical carbon dioxide is only about 1 / 3 of the heat transfer coefficient of water working medium. At the same time, due to the characteristics of supercritica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C9/08F23C7/00F23C6/04F23L1/00F23L9/00F23N3/00
CPCF23C6/04F23C7/00F23C9/08F23C2201/101F23C2202/30F23L1/00F23L9/00F23N3/00
Inventor 向军朱萌周敬陈磊赵志刚李艾书苏胜胡松江龙汪一徐俊
Owner HUAZHONG UNIV OF SCI & TECH
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