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Multistage over fire air distributing mode

A technology of burn-out air and separation of burn-out air, which can be used in combustion methods, combustion equipment, and incombustible liquid/gas transportation. , Improve combustion efficiency and achieve the effect of low NOx emission

Active Publication Date: 2010-06-16
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tail flue gas denitrification technology is relatively thorough, but its investment and operation and maintenance costs are expensive

Method used

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  • Multistage over fire air distributing mode
  • Multistage over fire air distributing mode
  • Multistage over fire air distributing mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] to combine figure 2 , image 3 , Figure 4 with Figure 5 To describe this embodiment, image 3 for figure 2 I-I sectional view, Figure 4 for figure 2 II-II sectional view, Figure 5 for figure 2 Sectional view of IV-IV, figure 2 for image 3 , Figure 4 with Figure 5 Sectional view of III-III.

[0040] A multi-stage burn-off air arrangement method provided by the present invention includes a boiler body 1, a furnace 2, a coal mill 3, a pulverized coal pipeline 4, a primary air pulverized coal nozzle 5, a secondary air nozzle 6, a main burner 8, a low-level Separation overburning air wind box 10, high separation overburning air wind box 16 and furnace horizontal outlet panel superheater 18. Each boiler 1 is equipped with six coal mills 3 . The furnace 2 is composed of four water-cooled walls 7, and a group of main burners 8 are arranged on each corner of the furnace 2, and each group of main burners 8 is vertically arranged with six primary air pulv...

Embodiment 2

[0053] to combine Image 6 with Figure 7 To describe this embodiment, Figure 7 for Image 6 The V-V sectional view, Image 6 for Figure 7 Sectional view of III-III.

[0054] The difference between this embodiment and Embodiment 1 is that the rotation direction of the first high-level imaginary tangent circle 20 formed by the center line of the high-level separation burn-off air nozzle 17 arranged on the four walls is the same as that of the imaginary tangent circle 9 of the main burner 8 and The direction of rotation of the low imaginary tangent circle 19 of the low separation burnout air box 10 is opposite, see Figure 7 .

[0055] At the same time, the distance L1 between the centerline of the high-level separation burn-off air nozzle 17 arranged on the front and rear walls and the centerline of the water-cooled wall 7 is a quarter of the width Lw of the furnace 2 from the nearest corner of the furnace 2, Namely: L1=1 / 4Lw, see Figure 7 . Similarly, the distance ...

Embodiment 3

[0059] Such as Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that the high-level separation overfire air is arranged in a circle with four corners. Other structures and test results are the same as in Example 1.

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Abstract

The invention provides a multistage over fire air distributing mode. The mode comprises a primary air pulverized coal nozzle, a secondary air nozzle, main burners, low separating over fire air bellows and high separating over fire air bellows, wherein a group of the main burners is arranged at each corner of a hearth; the separating over fire air is divided into low separating over fire air and high separating over fire air; the low separating over fire air bellows are arranged at four corners of the hearth or on four walls; and the high separating over fire air bellows are arranged at the four corners of the hearth or on the four walls. The distributing mode can realize NOx low emission based on NOx effect of between 250 and 650mg / m3 controlled by integral air classification technology in the current combustion bituminous coal and meager coal furnace (oxygen concentration in smoke is 6 percent.) so as to reduce the generation amount of NOx by about 15 percent. The equipment solves the problems of high combustibles in fly ash caused by the integral air classification technology in the furnace, large difference between speed and temperature of smoke at the outlet of the hearth and the like, and improves the operation regulating performance on different coal varieties and load changes.

Description

technical field [0001] The invention relates to a multi-stage overburning air arrangement method, which belongs to the technical field of combustion devices. Background technique [0002] Nitrogen oxides (NOx, including NO, NO 2 , N 2 O) is a class of gases that can cause serious air pollution and is considered to be one of the main sources of air pollution. Nitrogen oxides from the burning of fossil fuels account for a large proportion of all nitrogen oxide emissions worldwide each year. The increasingly stringent environmental regulations require the research and development of advanced combustion technologies to reduce emissions of pollutants such as NOx. At present, the most important feature of my country's energy composition is coal, accounting for more than 70%, which will produce a large amount of nitrogen oxide gas. Therefore, such an energy structure will have a negative impact on economic and efficient growth and the ecological environment. The existing techni...

Claims

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Application Information

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IPC IPC(8): F23C7/06F23L9/02
Inventor 张建文柳公权刘家宝李江涛
Owner SHANGHAI BOILER WORKS
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