Two-stage speed-down pulverized coal burner

A pulverized coal burner and the technology of the burner are applied in the burner, the burner for burning powder fuel, the burning method, etc., and can solve the problems of low volatile content and the like

Active Publication Date: 2010-02-03
BEIJING GUNGYAO ELECTRICITY EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned plasma pulverized coal burner adopts a pulverized coal concentration separation device, so that the plasma arc ignites the dense phase powder air flow, so that the pulverized coal is in a condition that is more conducive to being ignited, but even so, due to the poor quality pulverized coal The volatile content is low, and the above-mentioned existing pulverized coal burners still cannot ignite it

Method used

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  • Two-stage speed-down pulverized coal burner
  • Two-stage speed-down pulverized coal burner
  • Two-stage speed-down pulverized coal burner

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Embodiment approach 1

[0038] Such as Figure 1-3 As shown, the present invention provides a pulverized coal burner, which includes a reduced-speed ignition combustion chamber 1, and at least one socket 11 is provided on the axial side wall of the reduced-speed ignition combustion chamber 1. In this embodiment, it is provided There is a socket 11, and an ignition device is inserted in the socket 11 for igniting the pulverized coal passing through the reduced-speed ignition combustion chamber 1 . Wherein, the ignition device may be a micro-oil gun or a plasma gun or the like.

[0039] Since the heating energy of pulverized coal is directly proportional to the heating time under the premise that other conditions remain unchanged, the heating energy of the pulverized coal by the flame will be doubled every time the air velocity is doubled. In the present invention, its ignition combustion chamber is set as a speed-reducing ignition combustion chamber 1, that is, the speed at which pulverized coal pass...

Embodiment approach 2

[0049] In this embodiment, combined with Figure 8-10 As shown, the burner also includes a mixed combustion chamber 3 in addition to the above-mentioned reduced-speed ignition combustion chamber 1, and the mixed combustion chamber 3 is connected to the pulverized coal outlet end (rear end) of the reduced-speed ignition combustion chamber 1. The mixed combustion chamber 3 is provided with a thick-lean separation pipe 31 axially in the center, the diameter of the rear end of the thick-lean separation pipe 31 is larger than the diameter of the deceleration pipe 12, and the thick-lean separation pipe 31 and the outer wall of the mixed combustion chamber 3 pass through at least one rib 32 connections. The pulverized coal that comes out from the deceleration pipe 12 is sprayed into the thick-lean separation pipe 31 of the mixed combustion chamber 3, and the pulverized coal in the thick-lean separation pipe 31 is ignited. A part also enters the thick-thin separation pipe 31, and the...

Embodiment approach 3

[0053] combine Figure 8-10 As shown, the burner can also include an oxygen supply enhanced combustion chamber 4, which is connected to the tail end of the mixing combustion chamber 3, so that all the pulverized coal in the mixing combustion chamber 3 enters the oxygen supply enhanced combustion chamber 4. The high-temperature flame in the oxygen supply enhanced combustion chamber 4 mixes with the dilute-phase pulverized coal and ignites the dilute-phase pulverized coal to realize the complete combustion of the pulverized coal. The volatile matter in the first two combustion chambers 1 and 3 is basically burnt out. In order to improve the burnout rate of loose charcoal, the measure of enhanced combustion with oxygen supplementation in advance is adopted. The oxygen supplementation in advance meets the oxygen amount required for pulverized coal combustion in time. The enthalpy of the oxygen supply enhanced combustion chamber 4 is increased, and then the muzzle velocity of the n...

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Abstract

The invention discloses a two-stage speed-down pulverized coal burner, which comprises a speed-down ignition burning chamber, wherein the axial side wall of the speed-down ignition burning chamber isprovided with at least one inserting hole; and an ignition device for igniting pulverized coals passing through the speed-down ignition burning chamber is inserted in the inserting hole. Because the heating energy and the heating time of the pulverized coal are in direct proportion on the premise of other unchanged conditions, when the airflow speed reduces by one time, the heating energy of flameto the pulverized coals raises by one time. The ignition burning chamber is designed into the speed-down ignition burning chamber 1, namely the speed of the pulverized coals passing through the ignition burning chamber is reduced, so that the time of staying at high-temperature flame of the pulverized coals is prolonged, and the heating energy of the flame to the pulverized coals is raised so asto speed up heat chemical conversion to restore volatile matters and promote complete burning, thereby being favorable for ignition and stable burning.

Description

technical field [0001] The invention relates to a pulverized coal burner. Background technique [0002] After the pulverized coal is ignited, its combustion process is heating up, water evaporation, pyrolysis volatilization, volatile content burning and co-combustion of volatile content and coke. But for the poorer low-quality coal powder, its volatile content is low, so it is not easy to be ignited. [0003] Existing pulverized coal burners are generally used to ignite pulverized coal with a high volatile content, and in order to improve the favorable conditions for pulverized coal to be ignited, a burner for thick and thin pulverized coal has been produced. For example, the utility model patent of Chinese Patent No. CN200820013109.X discloses a "plasma pulverized coal burner", which consists of a primary combustion chamber, a primary combustion chamber throat, a secondary combustion chamber, and a secondary combustion chamber. Chamber throat, outer sleeve and pulverized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/00
Inventor 张照军赵虎军李滨
Owner BEIJING GUNGYAO ELECTRICITY EQUIP CO LTD
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