Pulverized coal burner

Abstract

The invention provides a pulverized coal burner which comprises a prechamber (1), a hearth (2) and an air supply unit (3) supplying air to the prechamber (1), wherein an outlet end of the prechamber (1) is communicated with the hearth (2), and a flame lighter (22) and a pulverized coal jetting pipe (36) are inserted into the prechamber (1). According to the pulverized coal burner provided by the invention, the lighting and the burning can be carried out grade by grade, and can be preferably controlled. Furthermore, the pulverized coal in the prechamber is higher in concentration, so that the flame can not be blown out by combustion air, the stable combustion can be realized, the pulverized coal airflow can be ignited by less igniting energy, the hot power of the igniter can be reduced, the resources waste can be avoided, the detonation can be avoided, and the safety performance can be improved.

Description

technical field [0001] The invention relates to a pulverized coal burner. Background technique [0002] In power stations, most medium-capacity pulverized coal burners adopt a multi-stage ignition method. The igniter ignites gas fuel, liquid fuel or pulverized coal step by step, and then ignites pulverized coal and the furnace. At present, during the operation of the pulverized coal burner, the amount of ignition oil is very considerable. Under unfavorable working conditions (such as poor coal quality, low load, abnormal coal supply, etc.), it is necessary to add fuel to support combustion, resulting in the heat of the igniter The power accounts for a large proportion of the total thermal power of the burner (mostly about 10%), and the thermal power of the igniter with other functions (such as stable combustion, low-load combustion, etc.) accounts for the proportion of the total thermal power of the burner. Larger (up to 20% to 30%), resulting in a waste of resources. In a...

AI Technical Summary

Problems solved by technology

At present, during the operation of the pulverized coal burner, the amount of ignition oil is very considerable. Under unfavorable working conditions (such as poor coal quality, low load, abnormal coal supply, etc.), it is necessary to add fuel to support combustion, resulting in the heat of the igniter The power accounts for a large proportion of the total thermal power of the burner (mostly about 10%), and the thermal power of the igniter with other functions (such as stable combustion, low-load combustion, etc.) accounts for the proportion of the total thermal power of the burner. Larger (up to 20% to 30%), resulting in a waste of resources

In addition, due to the excessive thermal power of the igniter, it is easy to cause deflagration, which brings safety hazards

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