Large rolling suction jet burn-off air system and spray method

A technology of burn-out wind and high-speed jet, which is applied in combustion equipment, lighting and heating equipment, etc., can solve the problems of reducing nitrogen oxides, high carbon content in fly ash, and damage to reduction zones, so as to reduce the concentration of carbon monoxide and reduce fly ash. Ash carbon content, effect of reducing nitrogen oxides

Pending Publication Date: 2018-04-20
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional overburning air is directly injected, which will lead to rapid destruction of the reduction zone, and the reduced nitrogen oxides will be regenerated in the later burnout zone due to combustion of unburned carbon, etc., and even cause the carbon content of the fly ash to be high. Large, the water wall in the burnout area is slagging, the deviation of the outlet smoke temperature increases, and the effect of air classification on reducing nitrogen oxides is also reduced

Method used

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  • Large rolling suction jet burn-off air system and spray method
  • Large rolling suction jet burn-off air system and spray method
  • Large rolling suction jet burn-off air system and spray method

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Embodiment 1

[0021] like Figure 2 to Figure 4 As shown, the large entrainment jet burn-off air system of the present embodiment includes a furnace 5, a top burn-off air nozzle 3 on the front wall 1 and a rear wall 6 of the furnace 5, and the top burn-off air nozzle 3 and the main Both the front wall 1 and the rear wall 6 between the burners are provided with two layers of overburning air nozzles, each layer of overburning air nozzles includes several overburning air nozzles 4, and the overburning air nozzles 4 on the front wall and the rear wall It is a Y-shaped entrainment jet burn-off air nozzle. The nozzle 4 includes an air inlet pipe 7 and two air outlet pipes 8 connected to each other. The aspect ratio H / K is 1-6; the angle α between the two air outlet pipes and the center line of the air inlet pipe is 5°-45°;

[0022] The injection method for the above-mentioned large entrainment jet burn-off air system includes the following steps: inject several strands of burn-off air in four la...

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Abstract

The invention discloses a large rolling suction jet burn-off air system and a spray method comprises a furnace, and a top burn-off air spout. The large rolling suction jet burn-off air system and thespray method is characterized in that a front wall and a rear wall between the top burn-off air spout and a main burner are both at least provided with one layer of burn-off air nozzles, each layer ofburn-off air nozzles comprises a plurality of burn-off air nozzle, at least one layer of burn-off air nozzles of the front wall and / or rear wall is of a Y-shaped burn-off air nozzle, the burn-off air nozzle comprises a first air inlet pipe and two air outlet pipes which are connected with each other, and the two air outlet pipes are located at two sides of the horizontal direction of the axis ofthe air inlet pipe. According to the large rolling suction jet burn-off air system and the spray method, when oxynitride is reduced further, the concentration of the carbonmonoxide and unburned carbon in flue dust of the outlet of the furnace can be reduced, and combustion efficiency is enhanced.

Description

technical field [0001] The invention relates to an overburning air system and an injection method, in particular to a large entrainment jet overburning air system and an injection method for a pulverized coal boiler. Background technique [0002] Air staged combustion technology is one of the low-nitrogen combustion technologies commonly used in pulverized coal boilers. Its basic principle is to complete the combustion process of fuel in stages. The air that is less than the theoretical air is supplied to the main burner area, the fuel is burned under fuel-rich conditions, the temperature level of the combustion area is reduced, and a reducing atmosphere is formed to reduce the formation of nitrogen oxides. Arrange the overburning air nozzle above the main burner, the introduction of overburning air can provide enough oxygen to burn up the unburned carbon from the reduction zone, ensure combustion efficiency, and reduce the carbon content of fly ash; due to the main combusti...

Claims

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Application Information

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IPC IPC(8): F23C7/00F23C9/06
CPCF23C7/002F23C9/06
Inventor 张定海孔红兵杨章宁韦耿聂立
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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