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Low-oxynitride and low-load stable combustion device of turbulent combustor

A low nitrogen oxide, swirl burner technology, applied in burners, burners for burning powder fuel, combustion methods, etc., can solve problems that affect the ignition and stable combustion of pulverized coal, incomplete combustion of pulverized coal particles, and the probability of impact. increase and other problems, to achieve the effect of easy processing and installation, good adaptability to coal types, and improving the life of the device

Inactive Publication Date: 2013-10-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

[0009] The disadvantages of the tooth-shaped or petal-shaped burner: First, when the flaring design is large, it will guide the pulverized coal airflow to diffuse outwards, causing the pulverized coal airflow to mix with the secondary air prematurely, which affects the ignition and stable combustion of the pulverized coal. When the pulverized coal airflow velocity is high, the probability of the pulverized coal particles colliding with the surface of the burner increases, so that the pulverized coal particles are easily separated from the airflow and cause incomplete combustion loss

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  • Low-oxynitride and low-load stable combustion device of turbulent combustor
  • Low-oxynitride and low-load stable combustion device of turbulent combustor

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Embodiment Construction

[0030] The present invention provides a low-NOx and low-load combustion stabilization device for a swirl burner. The present invention will be further described below with reference to the drawings and specific embodiments.

[0031] Such as figure 1 As shown, the combustion stabilization device is installed horizontally in the primary air duct and consists of two parts. The first part is an impact part with a cone structure, and the second part is a vortex elimination part, which is composed of an arc generatrix revolving body and a sphere. A streamlined structure composed of intersecting components; the striker and the vortex eliminator share the bottom surface; the cone radius R is (0.3~0.6) Rc, the cone angle α is 10°~30°, and the front end chamfering arc radius R 0 Is (0.01~0.04)Rc; the arc radius of the slewing body of circular arc bus is (1.3~1.8)Rc, the radius of the sphere is r 0 Is (0.25~0.35) Rc, the central angle β is 60°~85°; the distance between the end of the stabiliz...

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Abstract

The invention belongs to the technical field of turbulent combustors of power plants, and in particular relates to a low-oxynitride and low-load stable combustion device of a turbulent combustor. The stable combustion device comprises two parts, namely, a ramming member and a vortex suppression member, wherein the ramming member is in a conoid structure, and the vortex suppression member is a streamlined structure body formed by two circular-arc surfaces. The stable combustion device is arranged near an outlet of a primary air pipe of the turbulent combustor; and when pulverized coal airflow passes through the stable combustion device, pulverized coal particles are gathered towards an outer ring of the primary air pipe, therefore the pulverized coal concentration is improved, the generation amount of NOx is effectively reduced, ignition heat is reduced, and timely ignition and stable combustion of the pulverized coal airflow under the conditions of low load and combustion of fault coal are facilitated. In addition, by means of the vortex suppression member of the stable combustion device, vortexes at the tail part of the stable combustion device can be effectively prevented from being formed, and the combustor can be prevented from slag-bonding, coking and burning-out.

Description

Technical field [0001] The invention belongs to the technical field of swirl burners in power plants, and particularly relates to a low nitrogen oxide low-load stable combustion device for swirl burners. Background technique [0002] Due to the rise in domestic coal prices, most power plants have switched to inferior coal with low calorific value. The stable combustion performance of swirl burners, especially the low-load stable combustion ability, has deteriorated. The pulverized coal is difficult to ignite, combustion is unstable, and even extinguishing occurs. , Which seriously endangers the safe and economic operation of the boiler. At present, the main measures to improve the stable combustion performance of swirl burners are: installing a thickening ring, improving the shape of the center flaring, adding a combustion stabilizing tooth or a stabilizing ring, etc. [0003] The concentration ring is generally installed in the primary air duct with a central duct. Through the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23D1/02
Inventor 孙保民肖海平康志忠郭永红王世昌
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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