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Combustion device with thin and thick breeze airflow stagger arrangement used for W-shaped flame furnace

A combustion device, the technology of rich and thin pulverized coal, which is applied in the combustion of lump fuel and gaseous fuel, the combustion of lump fuel and powder fuel, the combustion of liquid fuel and gaseous fuel, etc., can solve the problem of unstable combustion, Can not catch fire in time and other problems, to achieve the effect of increasing the residence time, improving the comprehensive index, and increasing the itinerary

Inactive Publication Date: 2009-07-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of unstable combustion and inability to ignite in time in the existing W-shaped flame furnace, the present invention further provides a combustion device arranged in a staggered arrangement of thick and thin pulverized coal flows on the W-shaped flame furnace

Method used

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  • Combustion device with thin and thick breeze airflow stagger arrangement used for W-shaped flame furnace
  • Combustion device with thin and thick breeze airflow stagger arrangement used for W-shaped flame furnace
  • Combustion device with thin and thick breeze airflow stagger arrangement used for W-shaped flame furnace

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specific Embodiment approach 1

[0009] Specific implementation mode one: as Figure 1~5 As shown, the combustion device used in this embodiment for the staggered arrangement of thick and thin pulverized coal flow on the W-shaped flame furnace, the combustion device includes two cyclones 7, two pulverized coal inlet pipes 8, light pulverized coal Air flow air duct 9, two dense coal powder air flow burners 6 and light coal powder air flow burner 3; light coal powder air flow air duct 9 is made of main pipe 9-1 and two branch pipes 9-2; each cyclone 7 The side wall at the upper end communicates with a pulverized coal inlet pipe 8, one end of each branch pipe 9-2 is inserted into the upper inner cavity of a cyclone 7, and the other ends of the two branch pipes 9-2 communicate with one end of the main pipe 9-1 , the other end of the main pipe 9-1 communicates with the light coal powder flow burner 3, and the lower end of each cyclone 7 communicates with a thick coal powder flow burner 6, and the light coal powder...

specific Embodiment approach 2

[0011] Specific implementation mode two: as Figure 1~5 As shown, the cross-section of the light coal powder flow burner 3 in this embodiment is elliptical, and the vertical plane where the major axis of the ellipse is located is parallel to the front wall or the rear wall 1 . With such a design, after the light coal powder airflow enters the furnace, it will receive the radiant heat from the center of the furnace with the largest area, which is more conducive to heat absorption and ignition. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0012] Specific implementation mode three: as Figure 1~5 As shown, the cross-section of the rich pulverized coal flow burner 6 and the surrounding peripheral air nozzle 5 in this embodiment are all circular. The cross-section of the dense coal powder flow burner 6 and the peripheral air nozzle 5 on its periphery are all circular, which can make the air flow at the outlet have greater rigidity, and can further go deep into the furnace, increase the stroke, and promote the combustion of pulverized coal, thereby improving combustion efficiency. Other compositions and connections are the same as those in Embodiment 1 or 2.

[0013] working principle:

[0014] When in use, several combustion devices of the present invention are arranged on the front and rear furnace arches of the W-shaped flame furnace. The pulverized coal airflow that enters the cyclone 7 through the pulverized coal inlet pipe 8 is divided into two strands, which are injected into the furnace through the burne...

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Abstract

The invention provides a combustion device used for staggeredly arranging rich / lean pulverized coal airflow on a W-shaped flame furnace, and relates to the combustion device. The combustion device solves the problems of unstable combustion and non timely ignition of the prior W-shaped flame furnace. A lean pulverized coal airflow nozzle (3) is inserted into an oil secondary air spout (4) and communicated with a furnace hearth, and the oil secondary air spout (4) is arranged on a furnace arch (2) close to a front wall or a rear wall (1). Rich pulverized coal airflow nozzles (6) are arranged on the furnace arch (2) close to the center of the furnace hearth and communicated with the furnace hearth, and a gap between the rich pulverized coal airflow nozzles (6) and the side wall of the furnace arch (2) is a perimeter air port (5); and the lean pulverized coal airflow nozzle (3) is arranged between the two rich pulverized coal airflow nozzles (6). The invention provides the rich / lean pulverized coal combustion device with high-efficiency and stable combustion and low NOx. The device can make the lean pulverized coal airflow receive radiant heat from a high temperature area in the middle of the furnace hearth well, ignite in time, reduce the fly ash combustible content, and realize low NOx combustion.

Description

technical field [0001] The invention relates to a combustion device, in particular to a combustion device for staggered arrangement of thick and thin pulverized coal airflows on a W-shaped flame furnace. Background technique [0002] W-shaped flame combustion technology is a combustion technology specially designed for burning low volatile coal, which can promote the burnout of coal powder by increasing the flame stroke. This technology has been adopted by the boilers of some domestic power plants. For the FW-type W-flame boiler, it adopts a cyclone-separated high-powdered-coal concentration burner (thick and thin type burner). The nozzle is placed on the side of the front and rear walls, and the light coal powder flow nozzle is placed on the side of the center of the furnace (such as Figure 6 ). Since the center of the furnace is a high-temperature area, the airflow of light pulverized coal is injected near the high-temperature area, and the airflow of dense pulverized c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C5/08F23C7/02
Inventor 李争起任枫王静杰陈智超苏伟
Owner HARBIN INST OF TECH
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