Central diffusion type tiny-oil ignition combustor

Abstract

The invention discloses a central diffusion type tiny-oil ignition combustor. An inner primary air pipe is mounted in a main primary air pipe, one section of the main primary air pipe extends into a tertiary pulverized coal combustion chamber, another section of the main primary air pipe is mounted in the inner primary air pipe, a pulverized coal concentration cone and a vortex-controllable flameexpanding blunt body are sequentially mounted in the inner primary air pipe along a flowing direction of fluid, and are coaxially installed; a small section of an L-shaped ignition oil gun in an abrasion-resistant sleeve is aligned with a cone of the vortex-controllable flame expanding blunt body, a small section of an L-shaped air inlet pipe is aligned with the bottom end of the vortex-controllable flame expanding blunt body in a hollow structure, air outlet holes are circumferentially uniformly distributed at the bottom end of the vortex-controllable flame expanding blunt body, and a plurality of circular secondary air inlet holes are equidistantly arranged on a closed end surface of the tertiary pulverized coal combustion chamber. High-temperature flame ejected by the ignition oil gun is ejected onto the flame expanding blunt body, and is obliquely diffused along the outer edge of the blunt body to a wall surface of a round pipe, ignition around a ring surface is realized, and ignition efficiency is greatly improved. In addition, the vortex-controllable flame expanding blunt body can control the size of a high-temperature backflow area formed at an outlet of a primary combustion chamber, so that fuel adaptability can be enhanced.

Description

technical field [0001] The invention relates to a pulverized coal burner, in particular to a center diffused micro-oil ignition burner. Background technique [0002] The conventional method for boiler start-up and low-load stable combustion in a thermal power station is to use a large oil gun to inject oil into the furnace and support combustion. Depending on the furnace type, 50-200 tons of fuel oil needs to be put in during the cold start of the boiler from ignition to pulverized coal feeding with load. With the use of micro-oil ignition and combustion-supporting technology, according to the principle of step-by-step energy amplification, a small amount of pulverized coal can be directly ignited with a high-energy oil gun, and then more pulverized coal can be ignited step by step; thus, a small amount of oil can be used to start the cold furnace of the boiler. According to different types of coal, the oil saving effect can generally reach 60-98%. At present, my country h...

AI Technical Summary

Problems solved by technology

Chinese patents ZL03255982.8, ZL200520145352.2, ZL200710156019.5, etc. have announced several different forms of micro-oil ignition burners, and these burners have their own advantages in realizing micro-oil ignition and low-load stable combustion; The arrangement of oil guns adopted by the burner makes the heating of pulverized coal by the high-temperature flame either single-point heating or multi-point heating, which results in long heating time and requires a long size of the entire pulverized coal burner

This is difficult for quite a lot of power plants, which will lead to a reduction in the burnout rate of pulverized coal at the outlet of the burner; this will greatly reduce the stability of ignition, and even lead to failure of normal ignition

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