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Throttling element regulation and control method for coal pulverizing system to realize uniform distribution of pulverized coal

A throttling element and pulverizing system technology, applied in the direction of instruments, electrical digital data processing, computer-aided design, etc., can solve problems affecting the safe operation of boilers, unfavorable coal consumption and pollutant discharge, and deviation of coal powder flow distribution, etc., to achieve Reduce unsafe factors and economic losses, improve safe and stable operation, and improve work efficiency

Active Publication Date: 2021-11-05
HUADIAN ELECTRIC POWER SCI INST CO LTD
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Problems solved by technology

Therefore, it is only possible to replace pulverized coal with air for distribution and leveling of pulverized coal under hot and cold conditions. This backward leveling method will eventually lead to a rather high distribution deviation of pulverized coal flow, up to ±30 to ±50%. , which not only affects the safe operation of the boiler, but also is not conducive to reducing coal consumption and pollutant emissions

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  • Throttling element regulation and control method for coal pulverizing system to realize uniform distribution of pulverized coal
  • Throttling element regulation and control method for coal pulverizing system to realize uniform distribution of pulverized coal
  • Throttling element regulation and control method for coal pulverizing system to realize uniform distribution of pulverized coal

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0035] Example.

[0036] In this embodiment, a throttling element control method for a pulverizing system to realize uniform distribution of coal powder includes the following steps:

[0037] 1) Use Solidworks 3D software to conduct a 1:1 geometric modeling of the coal pulverizer of the boiler pulverizing system and its parallel pulverized feeding pipeline device, as shown in figure 2 shown.

[0038] 2) Use the MP-PIC method to mesh the constructed geometric model of the boiler pulverizing system, as shown in image 3 shown. Set the initial flow field and boundary conditions according to the operating conditions of the pulverizing system and related physical properties (particle size, particle density, fluid pro...

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Abstract

The invention discloses a throttling element regulation and control method for a coal pulverizing system to realize uniform distribution of pulverized coal, and belongs to a coal pulverizing system technology in a power station boiler technology. The gas-solid flow characteristics in the coal pulverizing system are subjected to numerical simulation research through an MP-PIC method, online real-time detection of the pressure drop of each powder feeding pipeline and the concentration of pulverized coal at an outlet is achieved, the deviation of the pressure drop of each powder feeding pipeline and the concentration of pulverized coal is obtained, the corresponding size of a throttling element is obtained by combining an empirical formula, the opening degree of the throttling element is timely and effectively guided, regulated and controlled, the working efficiency is improved, the safe and stable operation of the boiler is further improved, and unsafe factors and economic losses caused by the safe and stable operation are reduced.

Description

technical field [0001] The invention relates to the pulverizing system technology in the power plant boiler technology, in particular to a throttling element control method for the pulverizing system to realize uniform distribution of coal powder. Background technique [0002] The coal pulverizers of pulverized coal boilers in large-scale coal-fired power plants generally use a direct blowing pulverization system to provide pulverized coal for the burners. The number of burners in each group corresponding to each coal pulverizer is 4 to 8. According to boiler design codes and standards, the deviation of pulverized coal flow rate and distribution deviation of pulverized coal mass flow among each group of burners should be less than ±5% and ±10% respectively. Due to the different lengths and orientations of the powder delivery pipes at the outlet of the coal mill, there is a large difference in the internal flow resistance of the air-powder mixture. Usually, resistance devices...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F111/10G06F113/08G06F119/14
CPCG06F30/28G06F2111/10G06F2113/08G06F2119/14Y02P90/02
Inventor 彭丽董方马治安敬旭业王彤
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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