Pulverized coal burner

Abstract

The invention relates to a pulverized coal burner which is characterized by comprising an air box, a powder feeding pipe, an ignition device and a blast pipe; a cylindrical fixed baffle plate with a conical cross section is axially arranged in the air box, an annular gap is left between one end of the fixed baffle plate and the air box, and a plurality of swirl vanes are circumferentially arranged in the annular gap; a precombustion chamber is arranged inside the fixed baffle plate; the outlet end of the powder feeding pipe penetrates the center of the air box to enter in the precombustion chamber, the inlet end of the powder feeding pipe is arranged outside the air box and connected with a feeder device, and the powder feeding pipe is fixedly connected with the air box; a return flow cap is arranged at the tail end of the outlet end of the powder feeding pipe and a special gap is left between the return flow cap and the outlet end of the powder feeding pipe; the ignition device comprises a fuel tank, a conduct pipe and an ignition electrode, wherein the fuel tank is arranged outside the air box; one end of the conduct pipe is connected with the fuel tank and the other end of the conduct pipe penetrates the air box to enter in the precombustion chamber to form a spouting vent; the ignition electrode is arranged at one side adjacent to the spouting vent; and one end of the blast pipe is connected with the air box and the other end of the blast pipe is connected with an air blower. The invention can be widely used in various small and medium-sized industrial coal powder boilers.

Description

technical field

[0001] The invention relates to a combustion device, in particular to a pulverized coal burner suitable for medium and small industrial pulverized coal boilers. Background technique

[0002] At present, the existing small and medium-sized industrial pulverized coal boilers, such as bed-fired boilers, reciprocating boilers and chain boilers, generally use traditional combustion devices, and these combustion devices use lump coal as the main fuel, and are not suitable for burning coal. Powder use. Currently, the pulverized coal burners used in power plant boilers generally have a volume structure that is only suitable for use in power plant boilers with huge furnaces, and cannot be directly used in small and medium-sized industrial pulverized coal boilers. And the existing combustion device that is used for oil-fired gas-fired boiler can't be directly used in the small and medium-sized industrial pulverized coal boiler because the fuel of conveying is differen...

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