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Efficient low-pollution W-shaped flame boiler OFA (over fire air) device and method

A low-pollution technology with exhaust air, applied in the combustion method, adjusting the air supply, controlling the combustion, etc., can solve the problems of large space occupation, complex structure, increased coal consumption of power plants, etc., to reduce the construction cost and difficulty, and to achieve strong jet rigidity. , the effect of simple structure

Active Publication Date: 2014-03-26
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing large-capacity (above 600MW) W-type flame boiler burn-out air equipment occupies a large space, has a complex structure, cannot take into account both the incident depth and lateral diffusion capacity, and cannot ensure sufficient mixing of burn-off air and mainstream flue gas. At the same time, it does not affect the combustion organization of the main combustion area, causing inconvenience in construction design and installation, reducing the thermal efficiency of the boiler, increasing the coal consumption of the power plant, and providing a high-efficiency and low-pollution W-type flame boiler burn-off air device and method

Method used

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  • Efficient low-pollution W-shaped flame boiler OFA (over fire air) device and method
  • Efficient low-pollution W-shaped flame boiler OFA (over fire air) device and method
  • Efficient low-pollution W-shaped flame boiler OFA (over fire air) device and method

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0035] Example.

[0036] see Figure 1 to Figure 12 The high-efficiency and low-pollution W-type flame boiler burn-off air device in this embodiment includes a burn-out air nozzle 1 in the main combustion zone, a wing wall burn-off air nozzle 2, a furnace arch 3, a lower furnace 4, an upper furnace 5, a burn-out The wind baffle and its actuator 6 , the wind box 7 provided with the overburned wind layer, the secondary air baffle and its actuator 11 , the annular air duct 12 , the butterfly valve 13 and the pipeline 14 . The wind box 7 in this embodiment is located above the furnace arch 3 and close to the throat of the W-shaped flame boiler; the lower furnace 4 is located below the upper furnace 5 .

[0037] One en...

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Abstract

The invention relates to an efficient low-pollution W-shaped flame boiler OFA (over fire air) device and method. Conventional large-capacity W-shaped flame boiler OFA equipment occupies large space and is complex in structure. The OFA device comprises main combustion zone OFA nozzles, wing wall OFA nozzles, an upper hearth, an annular air duct and an air box provided with OFA layers, and is characterized in that one end of each main combustion zone OFA nozzle is fixed on the water-cooled wall, close to the throat position, of the upper hearth, and the other end of each main combustion zone OFA nozzle is fixed on the air box; one end of each wing wall OFA nozzle is connected onto the annular air duct through a pipeline, and the other end of each wing wall OFA nozzle is connected onto the water-cooled wall, close to the side wall position, of the upper hearth; and each OFA nozzle comprises a center air duct, an outer annular air duct and a cyclone, and the center air ducts are located in the outer annular air ducts. The OFA method is characterized in that OFA is fed to the OFA nozzles, and the OFA volume accounts for 19%-25% of total volume of air entering the boiler. The efficient low-pollution W-shaped flame boiler OFA device is simple in structure and can guarantee full mixing of OFA and main stream smoke.

Description

technical field [0001] The invention relates to an overfire air device and method, in particular to a high-efficiency and low-pollution W-shaped flame boiler overfire air device and method. Background technique [0002] W-flame boiler has the following remarkable technical features in terms of combustion: ① pulverized coal particles stay in the furnace for a long time; ② the furnace temperature level is high, which improves the ignition environment and enhances combustion stability. Supplemented by technical measures such as laying guard burning belts, it is beneficial to the ignition of low-volatile fuels, the stability of flames and the burnout of fuels. However, due to the high temperature level in the furnace of the W-type flame boiler, a large amount of NOx is generated, and in the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), which was implemented on July 1, 2014, For W type flame boiler NO x The maximum allowable emission concentrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C7/02F23L9/02F23L9/04F23N3/00
Inventor 韩海燕刘鹏远阮炯明袁伟徐鹏志王贵华
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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