Ignition-stable pulverized coal burner and ignition method

Abstract

The invention provides an ignition stable-combustion pulverized coal burner and an ignition method, and belongs to the technical field of thermal power generation. The ignition stable-combustion pulverized coal burner comprises an ignition gun, an inlet section, a pre-combustion chamber and a flame transfer pipe; a combustion area and a secondary air channel used for feeding secondary air into the combustion area are arranged in the pre-combustion chamber. The front end of the inlet section extends into the pre-combustion chamber and is aligned with the combustion area, and the rear end is positioned outside the pre-combustion chamber and is a primary air inlet; the ignition gun is mounted at the center of the front end of the inlet section, and the front end extends into the pre-combustion chamber to align to the combustion area; the rear end of the flame transfer pipe is connected with the front end of the pre-combustion chamber, and the flame transfer pipe is used for conveying pulverized coal flames combusted in the combustion area to a preset position in the main combustor to be converged with pulverized coal airflow of the main combustor. The pulverized coal is used as fuel which is consistent with existing fuel of a power plant, a fuel oil burner and a plasma ignition device can be completely replaced, the ultra-low load stable burning and flexible adjusting functions of a power plant boiler can be achieved, and a thermal power plant does not need to use fuel oil as fuel any more.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and specifically discloses an ignition and stable combustion pulverized coal burner and an ignition method. Background technique [0002] At present, the burners or auxiliary systems used for ignition and stable combustion in the thermal power generation industry generally use fuel oil and pulverized coal as fuels. For example, CN201822194419.1 discloses an oil-fired burner device and a boiler. The oil-fired burner device is provided with: a first flow path and a second flow path for supplying liquid fuel and a third flow path for supplying atomized fluid are formed inside. a burner body of a flow path; and a burner tip connected to the burner body, the burner tip including at least one spray that mixes the liquid fuel supplied by the first flow path with the atomizing fluid supplied by the third flow path a first mixing nozzle; and at least one second mixing nozzle that mixes t...

AI Technical Summary

Problems solved by technology

[0005] However, when plasma technology is used for ignition, it has certain restrictions on coal types, especially for low-volatile coal types. The ignition ability is not ideal; when used for stable combustion, it needs to consume electricity continuously during operation, and the economy is poor; in addition, the cathode material of the plasma ignition device Short service life, frequent replacement is required, seriously affecting operation

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