An ultra-low load stable combustion preheating and decomposing combustion system and ultra-low load operation method

A combustion system and pre-pyrolysis technology, applied in the field of boiler combustion, can solve problems such as easy slagging, high nitrogen oxide emissions, and unsteady operation of once-through burners, so as to reduce NOx emissions, realize low-nitrogen combustion, and position The effect of flexible adjustment

Active Publication Date: 2021-11-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems existing in the prior art, the present invention provides an ultra-low-load stable combustion pre-pyrolysis combustion system and an ultra-low-load operation method. By installing pre-pyrolysis swirl burners on the front and rear walls of the boiler furnace, Solve the problem that the pulverized coal is ignited in the pre-combustion chamber of the swirl burner, resulting in high nitrogen oxide emissions and easy slagging, and the problem that the once-through burner cannot operate stably under ultra-low load

Method used

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  • An ultra-low load stable combustion preheating and decomposing combustion system and ultra-low load operation method
  • An ultra-low load stable combustion preheating and decomposing combustion system and ultra-low load operation method
  • An ultra-low load stable combustion preheating and decomposing combustion system and ultra-low load operation method

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Experimental program
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Effect test

Embodiment 1

[0047] Embodiment 1, when a 600MW boiler is operating under full load conditions, five coal mills 1 are in operation, and one coal mill 1 is in standby. Each coal mill 1 sends primary air powder to the direct-flow burner 4 in the corresponding burner layer through the first powder feeding pipeline 3, and the auxiliary air is provided by the bellows 2, and the primary air powder and auxiliary air are mixed and injected into the boiler furnace 8 In the interior, it is directly impacted by the high-temperature flame sweeping from the upstream adjacent corner, and the ignition conditions are superior, and the fire can be stably ignited. For layer C of the main burner 12, under full load conditions, its four preheating and deswirling flow burners 7 are temporarily not in operation, and only four direct flow burners 4 are in operation. The A channel and the C channel of the reversing valve 5 of the powder feeding pipeline are opened, the B channel is closed, and the secondary air re...

Embodiment 2

[0048] Embodiment 2, when the 600MW boiler is operating under 80% load condition, the burner in layer A is turned off and the corresponding coal mill 1 is deactivated, and the other four coal mills 1 are operated, and one coal mill 1 is in standby. At this time, the conveying mode of the primary air powder and auxiliary air of the boiler is exactly the same as that of the first embodiment. Each coal mill 1 sends primary air powder to the direct-flow burner 4 in the corresponding burner layer through the first powder feeding pipeline 3, and the auxiliary air is provided by the bellows 2, and the primary air powder and auxiliary air are mixed and injected into the boiler furnace 8 inside, then a steady fire. Four preheating deswirling flow burners 7 are not in operation temporarily, and only four direct current burners 4 are operated. The A channel and the C channel of the reversing valve 1 of the powder feeding pipeline are opened, the B channel is closed, and the secondary ai...

Embodiment 3

[0049] Example 3: When a 600MW boiler is operating at 60% load, turn off the A-layer and B-layer burners and deactivate the corresponding coal mill 1, run the other three coal mills 1, and one coal mill 1 for standby . At this time, the conveying method of the primary air powder and the auxiliary air of the boiler is exactly the same as that of Embodiment 1, so it will not be described again.

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Abstract

The invention discloses an ultra-low-load stable combustion pre-pyrolysis combustion system and an ultra-low-load operation method, including a coal mill, an air box, a first powder feeding pipeline, a direct current burner, a powder feeding pipeline reversing valve, and a secondary air adjustment Valve, preheating and deswirling burner, boiler furnace, secondary air duct and main burner; the center height of the nozzle of the preheating and deswirling burner is the same as the height of the nozzle of the direct-flow burner on the floor; the coal mill passes through the first The powder feeding pipeline is connected to the direct-flow burner and the preheating deswirl burner, the preheating deswirl burner is installed on the front and rear walls of the boiler furnace, and the air box is arranged on the side adjacent to the boiler furnace where the preheating deswirl burner is installed On the wall, the air box is connected with the direct-flow burner and the preheating solution swirl burner; it can make the pulverized coal undergo low-temperature pyrolysis in the pre-combustion chamber of the preheating solution swirl burner, and the pyrolysis product is mixed with the external secondary air, and then Spray into the boiler furnace for stable combustion, ensure the stable operation of the boiler under ultra-low load, and meet the needs of deep peak regulation.

Description

technical field [0001] The invention belongs to the field of boiler combustion, and in particular relates to an ultra-low-load stable combustion pre-pyrolysis combustion system and an ultra-low-load operation method. Background technique [0002] With the deterioration of the ecological environment, the pace of global carbon dioxide emission reduction is accelerating, and the energy structure will change. In recent years, low-carbon new energy represented by wind energy and solar energy has developed rapidly, and large-scale wind and solar energy have been connected to the grid. However, these power sources have strong randomness, energy production is intermittent, and cannot be adjusted according to the needs of the grid. characteristics, which pose a great challenge to the security and stability of the power grid. According to analysis, after the proportion of wind power and photovoltaics in the power system reaches a certain percentage of 15%-20%, every percentage point ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C7/00F23L9/00F23N1/04
CPCF23C7/002F23L9/00F23N1/042
Inventor 谭厚章杨文俊熊小鹤邓双辉王毅斌王学斌杨富鑫
Owner XI AN JIAOTONG UNIV
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