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Pulverized coal burner

a burner and pulverized coal technology, applied in the direction of solid fuel combustion, combustion types, lighting and heating apparatus, etc., can solve the problems of reducing the axial length of the burner, so as to prevent the axial length from being increased

Inactive Publication Date: 2010-03-11
IHI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a pulverized coal burner for a furnace such as a coal-fired boiler. The technical effect of the invention is to provide a more efficient and effective pulverized coal burner that can adjust the combustion condition of the fuel to optimum through the adjustment of secondary and tertiary airs, while also utilizing the oil burner for ignition of the pulverized coal. Additionally, the invention provides a more simplified and streamlined design of the pulverized coal burner that reduces the likelihood of blockages and other issues associated with conventional burners.

Problems solved by technology

The increase in temperature of the furnace wall 2 and of the furnace 1 may melt the clinker, so that disadvantageously slagging may occur more easily and NOxmay be generated more easily.
To cope with increased combustion capacity of the pulverized coal burner, the nozzle is made larger-sized; however, its axial length remains limitative owing to installational restrictions.

Method used

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Examples

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Embodiment Construction

[0042]An embodiment of the invention will be described in conjunction with the drawings.

[0043]FIG. 2 shows a pulverized coal burner according to the invention. In FIG. 2, the parts similar to those shown in FIG. 1 are represented by the same reference numerals and explanations thereon are omitted.

[0044]A pulverized coal burner 5 comprises a nozzle body 6 and a secondary air adjusting device 7. The burner 5 is arranged coaxially of a throat 3 open to the furnace wall 2. The burner 5 is arranged in a wind box 4.

[0045]The nozzle body 6 comprises an outer sleeve 8 and an inner sleeve 9 coaxially of the outer sleeve 8. Formed between the sleeves 8 and 9 is a hollow, cylindrical fuel flow space 10. The nozzle body 6 has a greater diameter relative to its axial length (see, for example, the conventional example shown in FIG. 1).

[0046]FIG. 2 shows an example of the nozzle body 6 with larger diameters. That is, the outer sleeve 8 has larger diameters in comparison with the inner sleeve 9, wh...

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Abstract

Slagging is prevented from occurring in a pulverized coal burner.A nozzle body 6, which is open to a furnace 1 and which injects pulverized coal together with primary air 14 transporting the coal to serve finally as combustion air, has an outer sleeve 8 and an inner sleeve 9 arranged in and coaxially of the sleeve 8. A fuel flow space 10 is formed between the sleeves 8 and 9. Straightening plates 29 are arranged on at least either of the sleeves 8 and 9 to project to the space 10 and extend axially of the nozzle body. The combustion air (primary air 14) carrying the pulverized coal passes through the space 10 and is injected.

Description

TECHNICAL FIELD[0001]The present invention relates to a pulverized coal burner for a furnace such as coal-fired boiler which uses coal as fuel.TECHNICAL BACKGROUND[0002]In one of furnaces using coal as fuel, raw coal is pulverized into pulverized coal by a coal pulverizer and pulverized coal is mixed and fed with primary air into a pulverized coal burner where the pulverized coal is injected to the furnace for suspension combustion.[0003]The conventional pulverized coal burner will be described in conjunction with FIG. 1.[0004]In FIG. 1, reference numeral 1 denotes a furnace; and 2, a wall of the furnace 1.[0005]A throat 3 is installed on the furnace wall 2 and a wind box 4 is arranged on a side away from the furnace 1. A pulverized coal burner 5 is arranged in the wind box 4 coaxially of the throat 3.[0006]The pulverized coal burner 5 comprises a nozzle body 6 and a secondary air adjusting device 7 which surrounds a front end of the nozzle body 6.[0007]The nozzle body 6 comprises a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F23D1/00F23C99/00F23K3/00
CPCF23D1/00
Inventor FUJIMORI, TOSHIROWATANABE, SHINJIYAMADA, TOSHIHIKO
Owner IHI CORP