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Flameless combustor without preheating and switching

A flameless combustion and fuel technology, applied in the direction of burners, gas fuel burners, combustion types, etc., can solve the problems of easy flameout, high fuel and air jet velocity, and safety risks, so as to achieve uniform temperature distribution and realize non-toxic The effect of flame combustion, high safety and stability

Active Publication Date: 2019-12-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this design avoids switching from swirl air to direct air, due to the high velocity of fuel and air jets, it is easy to extinguish the flame when preheating the furnace, and there are also safety risks

Method used

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  • Flameless combustor without preheating and switching
  • Flameless combustor without preheating and switching
  • Flameless combustor without preheating and switching

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0031] Such as Figure 1~4 As shown, the embodiment of the present invention proposes a flameless burner that does not require preheating and switching. The burner includes a fuel supplier 13 and an air supplier 14 symmetrically distributed along the centerline of the furnace 7, wherein:

[0032] The fuel supplier 13 includes a fuel nozzle 1, an auxiliary air nozzle 3 and a first recirculation ...

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Abstract

The invention belongs to the field of combustors, and particularly discloses a flameless combustor without preheating and switching. A fuel feeder comprises a fuel nozzle, auxiliary air nozzles and afirst backflow cavity, wherein the fuel nozzle vertically extends into the bottom of the first backflow cavity, and the auxiliary air nozzles are symmetrically arranged at the top edge of the first backflow cavity; the first backflow cavity is provided with a first annular entrainment port, a second annular entrainment port and a fuel outlet, and is used for entraining flue gas and providing a combustion space for flameless combustion of fuel; and an air feeder comprises an air nozzle and a second backflow cavity, wherein the air nozzle vertically extends into the bottom of the second backflowcavity, the second backflow cavity is provided with a third annular entrainment port and an air outlet, so that a large-scale circulation is formed in a hearth. According to the flameless combustor without preheating and switching, a vortex backflow area can be formed in the first backflow cavity, so that the temperature distribution in the first backflow cavity is ensured to be uniform, the fuelis stable in flameless combustion under the action of the flue gas, and the temperature distribution in the whole hearth can be ensured to be uniform.

Description

technical field [0001] The invention belongs to the field of burners, and more specifically relates to a flameless burner without preheating switching. Background technique [0002] NO produced during combustion x As one of the important sources of air pollution, it needs to be strictly controlled. To reduce NO x At present, some domestic gas-fired boilers use domestically-made graded low-nitrogen burners and flue gas external circulation, which can reduce the NO produced by natural gas combustion. x Emissions reduced to 30mg / m 3 Below, but the maximum output of the boiler is reduced by about 10%, sacrificing the efficiency of the boiler. However, it is difficult to reach 200 mg / m even if the steel heating furnace adopts the staged combustion method. 3 (8% base oxygen) the latest steel industry ultra-low emission standards. Therefore, from deep inhibition of NO x In-depth research and technology development in the generated direction is imminent. [0003] Flameless c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/24F23D14/46F23D14/48F23D14/26F23D14/60F23D14/66F23D14/68
CPCF23D14/24F23D14/26F23D14/46F23D14/48F23D14/60F23D14/66F23D14/68Y02E20/34
Inventor 李鹏飞邵宇浩杨晨蔡冰高健王广航柳朝晖
Owner HUAZHONG UNIV OF SCI & TECH
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