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A three-stage burn-off air arrangement

A technology of burn-out air and separation of burn-out air, applied in combustion equipment, lighting and heating equipment, etc., can solve the problems of expensive investment and operation and maintenance costs, eliminate the residual swirl intensity of flue gas, improve combustion efficiency, realize The effect of low NOx emissions

Active Publication Date: 2016-01-20
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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  • A three-stage burn-off air arrangement
  • A three-stage burn-off air arrangement
  • A three-stage burn-off air arrangement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] combine figure 2 , image 3 with Figure 4 To describe this embodiment, image 3 for figure 2 The Ⅰ-Ⅰ sectional view of Figure 4 for figure 2 The Ⅱ-Ⅱ sectional view of figure 2 for image 3 with Figure 4 Sectional view of III-III.

[0034] A three-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, middle separation overburning air wind box 16, high separation overburning air wind box 30 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 pulverized coal nozzles 5 a...

Embodiment 2

[0044] combine Figure 5 , image 3 , Figure 4 with Image 6 To describe this embodiment, image 3 for Figure 5 The Ⅰ-Ⅰ sectional view of Figure 4 for Figure 5 The Ⅱ-Ⅱ sectional view of Image 6 for Figure 5 The Ⅳ-Ⅳ sectional view, Figure 5 for image 3 , Figure 4 with Image 6 Sectional view of III-III.

[0045] A three-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, middle separation overburning air wind box 16, high separation overburning air wind box 30 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 ...

Embodiment 3

[0056] combine Figure 7 , image 3 , Figure 4 with Figure 8 To describe this embodiment, image 3 for Figure 7 The Ⅰ-Ⅰ sectional view of Figure 4 for Figure 7 The Ⅱ-Ⅱ sectional view of Figure 8 for Figure 7 The Ⅳ-Ⅳ sectional view, Figure 7 for image 3 , Figure 4 with Figure 8 Sectional view of III-III.

[0057] The difference between this embodiment and Embodiment 2 is that the rotation direction of the second imaginary tangential circle 21 of the high-position separation over-burning air nozzle formed by the center line of the high-position separation over-burning air nozzle 31 arranged on the four walls is the same as that of the main burner 8 The direction of rotation of the imaginary tangent circle 9 of the low position separated burnout air box 10 and the low position imaginary tangent circle 19 of the low position separation burnout wind box 10 are opposite, see Figure 7 .

[0058] At the same time, the distance L1 between the centerline of the...

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Abstract

The invention provides a three-stage overfire air arrangement mode, which involves primary air pulverized coal nozzles, secondary air nozzles, main burners, low separated overfire air bellows, middle separated overfire air bellows, and high separated overfire air bellows. Each corner of a furnace hearth is provided with a main burner. Separated overfire air is divided into low separated overfire air, middle separated overfire air and high separated overfire air. The low separated overfire air bellows are arranged at four corners of the furnace hearth or on four walls, the middle separated overfire air bellows are arranged at four corners of the furnace hearth or on four walls, and the high separated overfire air bellows are arranged at four corners of the furnace hearth or on four walls. On the basis that the NOx in combustion bituminous coal and meager coal is controlled at 250-650mg / m<3> (under the condition of a flue gas oxygen concentration of 6%) by a current in-furnace integral air classification technology, the arrangement mode provided in the invention can realize low emission of NOx and make NOx production further reduced by about 25%. The arrangement mode disclosed in the invention solves the problems of fly ash combustible content, large flue gas velocity and temperature deviations at a furnace hearth outlet and the like caused by the in-furnace integral air classification technology, and at the same time, an operation regulation performance directed at different coal type and load changes is added.

Description

technical field [0001] The invention relates to a three-stage overburning air arrangement method, which belongs to the technical field of combustion devices. Background technique [0002] Nitrogen oxides (NO x , including NO, NO 2 , N 2 O) is a type of gas 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. Increasingly stringent environmental regulations require research and development of advanced combustion technologies to reduce NO x emissions of pollutants. 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. Existing control conventional coa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C7/00
Inventor 张建文肖琨倪建军闫凯
Owner SHANGHAI BOILER WORKS
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