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Center powder feeding swirling pulverized coal combustion device preventing slag forming of water cooling wall

A technology of pulverized coal combustion and water-cooled wall, applied in the burner, combustion method, combustion type, etc., can solve the problems of high NOx emission and serious slagging, and achieves reduction of NOx emission, improvement of conversion rate, and avoidance of in-furnace formation. slag effect

Active Publication Date: 2017-12-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of severe slagging and high NOx emission in the existing pulverized coal combustion technology of industrial pulverized coal boilers, and further provides a center-feeding swirl pulverized coal combustion device for preventing water wall slagging

Method used

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  • Center powder feeding swirling pulverized coal combustion device preventing slag forming of water cooling wall
  • Center powder feeding swirling pulverized coal combustion device preventing slag forming of water cooling wall
  • Center powder feeding swirling pulverized coal combustion device preventing slag forming of water cooling wall

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specific Embodiment approach 1

[0026] Specific implementation mode one: see figure 1 and figure 2 To illustrate, a center-feeding swirl pulverized coal combustion device for preventing water wall slagging in this embodiment includes a primary air duct 1, an inner secondary air channel 2, an outer secondary air channel 3, and an inner secondary air cyclone 2-1, external secondary air cyclone 3-1, annular overburning air channel 4, annular recirculation flue gas channel 5, induced draft fan 6 and recirculation flue gas pipe 7, one end of the induced draft fan 6 is connected to the tail of the boiler The flue gas channel is connected, the other end is connected to the inlet end of the recirculation flue gas pipe 7, the outlet end of the recirculation flue gas pipe 7 is connected to the annular recirculation flue gas channel 5, and the primary air pipe 1 is set inside the secondary In the air channel 2, the inner secondary air channel 2 is set in the outer secondary air channel 3, the inner secondary air cycl...

specific Embodiment approach 2

[0028] Specific implementation mode two: combination image 3 Note that the nozzles of the primary air pipe 1 , the inner secondary air passage 2 and the outer secondary air passage 3 of this embodiment are arranged on the furnace roof of the pulverized coal vertical boiler. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0029] Specific implementation mode three: combination Figure 4 and Figure 5 It is explained that a center-feeding swirl flow pulverized coal combustion device for preventing water wall slagging in this embodiment also includes an overburning wind swirling blade 4-1, and the overburning wind swirling blade 4-1 is arranged on the annular combustion chamber. In the exhaust channel 4. This structure can strengthen the mixing of the overburning air and the high-temperature flue gas in the main combustion zone, which is beneficial to the continuous burning of unburned coal particles in the high-temperature flue gas. In this embodiment, the overfired air is in the form of swirling flow, and the recirculated flue gas is in the form of direct flow. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a center powder feeding swirling pulverized coal combustion device preventing slag forming of a water cooling wall and belongs to the technical field of industrial boiler pulverized coal combustion. The problems of severe slag forming and high NOx emission in the prior pulverized coal combustion technology for industrial pulverized coal boilers can be solved. the center powder feeding swirling pulverized coal combustion device comprises a primary air pipe, an inner secondary air channel, an outer secondary air channel, an inner secondary air cyclone, an outer secondary air cyclone, an annular over fire air channel, an annular recycle smoke channel, an induced draft fan and a recycle smoke pipe. The outlet end of the recycle smoke pipe is connected with the annular recycle smoke channel. The primary air pipe is arranged in the inner secondary air channel. The inner secondary air channel is arranged in the outer secondary air channel. The inner secondary air cyclone is arranged in the inner secondary air channel. The outer secondary air cyclone is arranged in the outer secondary air channel. The outer secondary air channel is sleeved with the annular over fire air channel. The annular over fire air channel is sleeved with the annular recycle smoke channel. The center powder feeding swirling pulverized coal combustion device is suitable for industrial pulverized coal boilers.

Description

technical field [0001] The invention belongs to the technical field of pulverized coal combustion of industrial boilers, and specifically relates to a central powder-feeding swirling pulverized coal combustion device suitable for pulverized coal combustion of industrial boilers to prevent slagging of water walls. . Background technique [0002] Industrial boiler is a well-known thermal equipment, which plays an important role in modern industrial production and social life. In my country, coal-fired industrial boilers are the main coal-consuming equipment except power plant boilers, with a total of nearly 600,000 units and an annual coal consumption of nearly 700 million tons. However, my country's coal-fired industrial boilers generally have problems such as low efficiency and serious pollution. According to statistics from relevant departments, the average annual operating efficiency of my country's coal-fired industrial boilers is only 60%-65%, and the annual NOx emissio...

Claims

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Application Information

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IPC IPC(8): F23D1/02F23L1/00F23L9/00F23J15/00
CPCF23D1/02F23J15/00F23L1/00F23L9/00
Inventor 陈智超杨秀超高禄山严蓉曾令艳李争起
Owner HARBIN INST OF TECH
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