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Underarch secondary-wind down ward-bias W-type flame furnace

A technology of flame furnace and secondary air, which is applied to the configuration of valves, the transportation of non-flammable liquids/gases, and combustion methods. Reduce the amount of generation, which is conducive to the effect of promoting the application

Active Publication Date: 2006-10-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of insufficient pulverized coal combustion and low combustion efficiency in the existing W-type flame furnace, the present invention provides a W-type flame furnace that can improve the combustion efficiency of pulverized coal and reduce the amount of nitrogen oxides produced

Method used

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  • Underarch secondary-wind down ward-bias W-type flame furnace
  • Underarch secondary-wind down ward-bias W-type flame furnace
  • Underarch secondary-wind down ward-bias W-type flame furnace

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specific Embodiment approach 1

[0007] Specific implementation mode 1: Due to the problem of low combustion efficiency in the application process of the current W-shaped flame furnace, it has been found through a large number of analysis and research that in many cases, the wind on the arch is affected by the horizontal direction of the arch during the vertical downward injection process. The barrier of the secondary air injected into the furnace cannot continue to penetrate into the furnace downwards, and it turns upward in advance, resulting in the consequence that the pulverized coal stays in the furnace for a short period of time, which is unfavorable for burnout and low combustion efficiency. In view of this problem, this embodiment provides a W-shaped flame furnace with the secondary air biased downwards under the arch, which includes an upper furnace 1, a lower furnace 2, and a burner 5. On the side wall of the lower furnace 2, there is a secondary air furnace. The slit 2-1, the secondary air slit 2-1 ...

specific Embodiment approach 2

[0008] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the secondary air duct 7 under the arch is arranged obliquely, refer to figure 2 . For newly produced equipment, the solution described in this embodiment can be adopted, and an inclined downward deflector 8 is arranged in the inclined secondary air duct 7 under the arch, so that the pulverized coal airflow can be further penetrated into the lower At the bottom of the furnace, the residence time of pulverized coal particles in the high temperature zone of the furnace is prolonged, and the combustion of pulverized coal particles is better promoted.

specific Embodiment approach 3

[0009] Specific embodiment three: the difference between this embodiment and specific embodiments one and two is that it also includes a burnout air duct 4, referring to image 3 , both ends of the burnout air duct 4 communicate with the secondary air duct 3 and the upper furnace 1 respectively. The simple structure described in this embodiment can greatly reduce NOx emissions and make the pulverized coal burn more fully. The principle is as follows:

[0010] Part of the secondary air in the secondary air duct 3 is sprayed into the upper furnace 1 through the overburned air nozzle 4-1, so the amount of secondary air entering the lower furnace 2 through the secondary air slit 2-1 is reduced, so that the lower furnace 2 is in an oxygen-poor combustion state, showing a reducing atmosphere, which inhibits the formation of fuel-type NOx; and because the lower furnace is in an oxygen-poor state, the temperature is lower than that in the oxygen-enriched combustion state, and the uppe...

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Abstract

The invention relates to W type flame furnace with overgrate air down biasing under arch. It includes upper and lower hearth, and burner. The side wall of the lower hearth is set overgrate air slit. And the slit is connected to overgrate air path. And the path is set inclined guide plate. It can increase coal dust combustion efficiency for over one percent, and reduce nitrogen oxide generation quantity for twenty percent.

Description

technical field [0001] The invention relates to a combustion device. Background technique [0002] W-shaped flame combustion technology is a combustion technology specially designed for burning anthracite and other low-volatile coals. It can promote the burnout of coal powder by increasing the flame stroke and increasing the temperature of the combustion zone. This technology satisfies the national conditions of my country's power plant boilers that mainly use low-quality coal such as anthracite and lean coal. It has been adopted by some domestic power plant boilers and has broad application prospects. Since the W-type flame furnace burns anthracite, a higher temperature level in the furnace is required to ensure the burnout, thus resulting in a larger amount of nitrogen oxides (NOx). NOx is the main source of air pollution. The State Environmental Protection Administration and the State Administration of Quality Supervision, Inspection and Quarantine jointly issued the new...

Claims

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Application Information

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IPC IPC(8): F23L13/00F23L9/00
Inventor 李争起任枫秦裕琨
Owner HARBIN INST OF TECH