Self-stabilizing staged combustion pulverized coal burner

Abstract

The invention discloses a self-stabilizing staged combustion pulverized coal burner. The self-stabilizing staged combustion pulverized coal burner comprises, from inside to outside, a burning torch, aprimary pulverized coal air pipe, a burnout air distributing pipe, a secondary pulverized coal air pipe and a surrounding air pipe, wherein the burning torch and the primary pulverized coal air pipeare in sliding sleeve connection; the nozzle of the burning torch is provided with a burning oil nozzle and a choke plug; the outside of the air outlet section of the primary pulverized coal air pipeis connected in a sleeve mode with the burnout air distributing pipe; outside the primary pulverized coal air pipe and the burnout air distributing pipe is provided in a sleeve mode with the secondarypulverized coal air pipe; the outside of the secondary pulverized coal air pipe is connected in a sleeve mode with the surrounding air pipe; the front ends of the air outlets of the burnout air distributing pipe, the secondary pulverized coal air pipe and the surrounding air pipe are all provided with reducing joint sections. The self-stabilizing staged combustion pulverized coal burner is simplein structure, convenient and rapid to operate, high in economic practicability, energy-efficient and environmentally friendly, and can achieve graded control, two-stage combustion and oil-free combustion stabilization. Meanwhile, the self-stabilizing staged combustion pulverized coal burner is high in pulverized coal burnout rate, long in flame adjusting stroke, efficient and stable in boiler operation and good in popularization prospect.

Description

technical field [0001] The invention relates to an oil-free and stable combustion graded coal pulverized burner, which belongs to the field of coal-fired burners. Background technique [0002] At present, pulverized coal burners generally have problems such as insufficient pulverized coal combustion, difficulty in achieving internal combustion, self-stable combustion in an oil-free state, and optimal utilization of energy by blending different types of coal in the same burner. The reason is that : The internal combustion space of the pulverized coal burner is small. In order to prevent powder clogging, it is necessary to make the powder feeding speed fast, but if the powder feeding speed is too fast, the pulverized coal combustion time will be insufficient, especially for low volatile coal types, coal The low burnout rate of pulverized coal may cause high carbon content in the fly ash after pulverized coal is burned. Furthermore, after pulverized coal that is not fully ignit...

AI Technical Summary

Problems solved by technology

However, the flow rate of the primary air pulverized coal is too high, and it is easy to cause turmoil when it mixes with the air flow in the exhaust air distribution pipe after returning through the return cap, which will seriously affect the effect of the pulverized coal without oil and self-stable combustion. If the fuel gun is stopped supply, the flame of the pulverized coal flow will be extinguished quickly, thus affecting the normal combustion conditions in the boiler, leading to the emergence of safety hazards and safety accidents in the production process

[0004] In addition, the existing pulverized coal burners generally use primary pulverized coal for combustion, and the powder feeding speed is fast. Even if the flow rate is reduced by backflow, there are still problems such as insufficient combustion of pulverized coal and insufficient flame injection stroke.

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