Vortex combustor of coal fines circumferential direction concentration sectional stopping whorl

A swirl burner and trapped vortex technology, which is applied to burners, burners, combustion methods and other directions for burning powder fuel, and can solve the problem of not using the concentration-lean separation technology.

Inactive Publication Date: 2010-10-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese Invention Patent 03134317.1. "A Radial Concentration and Thinness Double Adjustable Wind Swirling Pulverized Coal Burner" proposes the technology of adding inner and outer tooth-shaped stable combustion rings at the burner nozzle. On the basis of...

Method used

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  • Vortex combustor of coal fines circumferential direction concentration sectional stopping whorl
  • Vortex combustor of coal fines circumferential direction concentration sectional stopping whorl
  • Vortex combustor of coal fines circumferential direction concentration sectional stopping whorl

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Embodiment example

[0029] 1. For lean coal,

[0030] The invention is applied to a certain Eπ-670-13.8-545KT steam boiler. The rated generating capacity of the unit is 215MW. Boiler is T-shaped layout, double furnace structure.

[0031] The quality of coal used is as follows:

[0032] Mt.

ad

Vdaf

St, d

Qnet, ar(kJ / kg)

6.53

32.77

15.87

2.83

20438.31

[0033] Effect after applying the present invention:

[0034] ① After the application of the present invention, the stable combustion capability of the boiler with low load and no oil input is reduced from 75% before the change to 50%

[0035] ②The cooling flow of reheater spray water is reduced from 15t / h before the modification to 0t / h after the modification, which greatly improves the economical efficiency of the unit.

[0036] 2. For inferior bituminous coal

[0037] The invention is applied to a certain 670-13.8-545KT type steam boiler. The rated generating capacity of the unit i...

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Abstract

The present invention provides a vortex combustor of coal powder circumferential compression space-sharing standing vortex, comprising a center air duct, a primary air duct, an internal secondary air duct and external secondary air duct arranged on periphery of a the center air duct from inside to outside in turn, a circumferential compression stream apparatus arranged inside secondary air duct, and a wedge-shaped circulation reflux standing vortex steady combustion body arranged at tail of the circumferential compression apparatus. After the primary air flows through the circumferential compression stream apparatus and the circumferential compression stream apparatus, the opening of the combustor forms an evident coal powder circumferential shade section and a strong standing vortex steady on-combustion section, and combustion condition of high temperature whirling current flue gas and poor-oxygen rich-fuel. Great on-combustion stabilization is provided. The invention is especially suitable for combustion of meagre coal, kilkenny coal and coarse coal, and for improving combustion flame stabilization of various coal.

Description

technical field [0001] The invention relates to a pulverized coal burner for a boiler, in particular to a pulverized coal circumferentially concentrated zone vortex swirl burner. Background technique [0002] The swirl burner is widely used in power plant boilers in my country. The swirl burner mainly relies on the strong rotation of the primary air flow and the secondary air flow to form a large and stable rotating return area at the burner outlet. The high temperature flue gas backflow ignites the pulverized coal. Due to the frequent changes in the quality of coal fired in power plants in my country, many problems such as delayed ignition of the original burner, unstable combustion, excessive water spraying of the reheater, and difficulty in igniting low-quality coal cannot be effectively resolved. . [0003] There are many new swirl burner structures. In order to solve the problem of low-quality coal ignition, it is generally used to increase the swirl strength of the pri...

Claims

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Application Information

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IPC IPC(8): F23D1/02
CPCY02E20/34
Inventor 谭厚章陈二强徐通模惠世恩
Owner XI AN JIAOTONG UNIV
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