Annular wall heat type reverse-spraying pulverized coal burner

Abstract

The invention provides an annular wall heat type reverse-spraying pulverized coal burner. The burner comprises a pre-burning structural body, a reverse-spraying assembly and a secondary air assembly,wherein the pre-burning structural body is provided with a pre-heating burning chamber and a central injection air pipe which communicates with the pre-heating burning chamber; the reverse-spraying assembly comprises a main pulverized coal pipe and a groove-shaped baffle ring, the main pulverized coal pipe is arranged on the outer side of the pre-burning structural body in a sleeving mode, a mainpulverized coal airflow channel is defined by the main pulverized coal pipe, and the groove-shaped baffle ring is connected to the end portion of the main pulverized coal pipe and partially located atthe outlet end of the pre-burning structural body; a reverse-spraying channel is defined by the groove-shaped baffle ring and the end portion of the pre-burning structural body; and the secondary airassembly comprises a secondary air pipe and hollow swirl starting blades, the secondary air pipe is arranged on the outer side of the main pulverized coal pipe in a sleeving mode, a secondary air channel is defined by the secondary air pipe and the main pulverized coal pipe, and the hollow swirl starting blades are arranged at the outlet end of the secondary air channel. Other pipelines and accessory structures do not exist in the pre-heating burning chamber, so that the annular wall heat type reverse-spraying pulverized coal burner is simple in structure and high in operation reliability.

Description

technical field [0001] The invention relates to the technical field of pulverized coal combustion equipment, in particular to an annular wall-heating reverse injection pulverized coal burner. Background technique [0002] With the continuous development of pulverized coal processing and combustion utilization technology, for the suspension combustion method of air-carrying pulverized coal, due to the strengthening of the mutual contact and mixing between the gas and solid phases, it can improve the boiler combustion compared with the layer combustion combustion method. It has great advantages in terms of efficiency and thermal efficiency. Compared with large power plant boilers, the furnace size of industrial boilers is smaller, which greatly reduces the residence time of pulverized coal in the furnace, and in order to prolong the residence time of pulverized coal in industrial boilers, and at the same time promote the The timely heating and ignition of industrial boilers o...

AI Technical Summary

Problems solved by technology

[0003] At present, the design of industrial pulverized coal burners is mostly based on specific coal types and full-load operating conditions, while industrial boilers often have the characteristics of large differences in coal types and wide load adjustment ranges in the actual operation process, which is easy to cause different coal types and Under variable load operation, poor pulverized coal burnout, unstable combustion and nitrogen oxides (NO x ) high emissions and many other problems

At the same time, for the traditional pulverized coal burner, the structure is more complex and contains multiple sets of movable structural parts, such as the air flow nozzle extending into the pre-combustion chamber type burner, and the angle adjustment of the secondary air swirl blade. Mechanisms, etc., after a period of actual operation of the pulverized coal burner, there are a series of problems such as bending of structural parts, burning damage and structural jamming to varying degrees, which reduces the reliability of the burner operation

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