A combustion burner of fine coal powder, and a combustion apparatus and method of fine coal powder

A combustion method and burner technology, applied in the direction of combustion method, combustion equipment, burner for burning powder fuel, etc., can solve problems such as improvement

Inactive Publication Date: 2004-08-18
HITACHI LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the single-stage combustion method, the combustion air is easily mixed with the pulverized coal flow, and even if a NOx-lean burner is used, the NOx release amount will still be significantly increased compared with the two-stage combustion method

Method used

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  • A combustion burner of fine coal powder, and a combustion apparatus and method of fine coal powder
  • A combustion burner of fine coal powder, and a combustion apparatus and method of fine coal powder
  • A combustion burner of fine coal powder, and a combustion apparatus and method of fine coal powder

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Effect test

Embodiment 1

[0038] Below, see Figure 1-Figure 4 The first embodiment of the present invention will be explained.

[0039] figure 1 is a schematic diagram of the pulverized coal burner of the present invention, Figure 2-Figure 4 is for with figure 1 The shown pulverized coal burner is shown in comparison with a schematic diagram of a burner in the prior art. Table 1 according to Figure 1-Figure 4 The pulverized coal burner shown lists the NOx concentration and the unburned component content in the embers at the exit of the combustion plant.

[0040] according to Figure 1-Figure 4 In the shown pulverized coal burner, reference numeral 10 denotes a pulverized coal nozzle for conveying pulverized coal by air flow, and a delivery pipe (not shown in the figure) is connected upstream of the nozzle. Two combustion air nozzles are arranged concentrically. Reference numerals 11 and 12 represent the secondary air nozzle and the tertiary air nozzle respectively. Reference numeral 13 denot...

Embodiment 2

[0064] Figure 9 A schematic diagram of a pulverized coal burner showing a second embodiment of the invention. according to Figure 9 , the tuyere is divided into two nozzles such as the secondary tuyere and the tertiary tuyere. A flame stabilization ring 21 is provided on the front end of the pulverized coal nozzle. Figure 9 The present embodiment shown with figure 1 The embodiment shown differs in that it has a spindle 31 in the pulverized coal nozzle.

[0065]Since the spindle body 31 is provided in the pulverized coal nozzle, the velocity of the pulverized coal flow passing through the periphery of the spindle body is increased. After passing the spindle in the nozzle, the air velocity decreases due to the enlarged flow cross-section. However, the pulverized coal particles are ejected at a faster flow rate than air because the pulverized coal particles have a heavier mass than air. Therefore, compared with carrier air, the radial scattering of pulverized coal after ...

Embodiment 3

[0067] Figure 10 is a schematic diagram showing a pulverized coal burner according to a third embodiment of the present invention. according to Figure 10 , Reference numeral 10 represents a pulverized coal nozzle for conveying pulverized coal by air flow, and a conveying pipeline (not shown in the figure) is connected with it upstream of the nozzle. Concentrically set two air nozzles for injecting air for combustion. Reference numerals 11 and 12 represent the secondary air nozzle and the tertiary air nozzle respectively. Reference numeral 13 denotes a furnace space for burning pulverized coal and air from a burner, and 14 denotes a flow of pulverized coal from a pulverized coal nozzle. Reference numerals 15 and 16 represent airflows from the secondary air nozzle and the tertiary air nozzle respectively.

[0068] According to this embodiment, the inner circumference of the outlet of the tertiary air nozzle 12 has a slanted sleeve, and the tertiary air is sprayed away from...

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Abstract

A burner for burning fine coal powder comprising: a fine coal powder nozzle 10 for injecting a mixture of the fine coal powder and air; and air nozzles 11, 12 for injecting air: wherein the sufficient amount of air for complete combustion of the fine coal powder is supplied from the air nozzles; a reducing flame at a high temperature is formed by consuming oxygen rapidly with forming a flame at a high temperature by igniting the fine coal powder rapidly in the vicinity of the outlet of the burner; and an oxidizing flame having an uniform distribution of gas composition in radial direction to the central axis of the burner is formed by mixing the air injected from the air nozzle in the downstream of the reducing flame at the high temperature.

Description

technical field [0001] The invention relates to a pulverized coal burner for conveying pulverized coal by air flow, a pulverized coal combustion equipment and a pulverized coal combustion method using the pulverized coal burner. More particularly, the present invention relates to a pulverized coal burner and a pulverized coal combustion apparatus, both of which can be preferentially used to reduce the concentration of nitrogen oxides (hereinafter referred to as NOx) and the amount of unburned parts in embers. Background technique [0002] In general, suppression of NOx from combustion is a problem that plagues combustors. In particular, pulverized coal has a higher nitrogen content than gaseous and liquid fuels. [0003] Therefore, reducing NOx levels in pulverized coal burners is more important than when using gaseous and liquid fuels. Most of NOx generated by burning pulverized coal (fine coal powder) is NOx generated by oxidizing nitrogen-containing components contained...

Claims

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Application Information

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IPC IPC(8): F23C99/00F23C6/04F23D1/00F23D1/02
CPCF23D1/00F23D2201/10F23C6/045F23C2201/20
Inventor 冈崎洋文小林启信津村俊一木山研磁神保正仓增公治森田茂树野村伸一郎下郡三纪
Owner HITACHI LTD
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