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Low NOx gas burner based on internal recycle of gas and method of reducing emission

A gas burner and internal circulation technology, applied in the direction of combustion methods, gas fuel burners, burners, etc., can solve the problems of reducing NOx emissions, weak swirl strength, and insufficient negative pressure, etc., to achieve long service life, Good working conditions and the effect of reducing NOx emissions

Pending Publication Date: 2018-09-07
HANGZHOU ZHEDA TIANYUAN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of generating the recirculation zone is generally to use the swirl flow at the outlet of the burner. However, in fact, because the swirl flow strength is weak and the negative pressure formed is not high enough, the amount of flue gas in the internal circulation is very small, and it is difficult to produce a significant reduction in NO x The effect of emissions
At present, it can only be used as an auxiliary means

Method used

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  • Low NOx gas burner based on internal recycle of gas and method of reducing emission
  • Low NOx gas burner based on internal recycle of gas and method of reducing emission

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 Shown, a low NO based on gas internal circulation x The gas burner includes a gas pipe 1, an inner secondary air passage 2, an outer secondary air passage 3, and an outer secondary air passage 3 outside the inner secondary air passage 2. The exit of the inner secondary air passage 2 and the outer secondary air passage 3 is provided with a stabilizing plate 8, and the flame 7 is sprayed from the stabilizing plate 8. The stabilizing plate 8 is made of heat-resistant steel.

[0029] Among them, the inner secondary air passage 2 is composed of an inner secondary air inlet pipe section and an inner Venturi type converging tube pipe section 9. The outer secondary air passage 3 is composed of an outer secondary air inlet pipe section and an outer Venturi type converging tube pipe section 4. The secondary air in the outer secondary air passage 3 has a cooling effect on the entire burner, and the burner has good working conditions and long service life. The left ...

Embodiment 2

[0039] Such as figure 2 As shown, the present invention can be further modified to simplify the secondary air channel into one channel (that is, the inner secondary air channel and the outer secondary air channel in Embodiment 1 are simplified into one channel). The existence of the venturi converging tube section of the burner can still produce a strong flue gas recirculation effect, and can also produce a strong NOx emission reduction effect. This kind of implementation case is mainly suitable for burners with lower power and less gas.

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Abstract

The invention discloses a low NOx gas burner based on an internal recycle of gas and a method of reducing emission and belongs to the technical field of gas fuel burning. The low NOx gas burner comprises a gas pipe and a secondary air channel, wherein a combustion stabilization disc is arranged at the outlet of the secondary air channel, and the secondary air channel is composed of a secondary airinlet pipe section and a Venturi reducing pipe section; and an internal circulation flue gas inlet is formed in the throat of the Venturi reducing pipe section in a hearth of a boiler. A flue gas recycle fan and a flue gas pipeline are not needed. The proportion of circular flue gas is 5-20% by way of internal circulation mode of flue gas, and reaches the flue gas circulation proportion of an external circulation method, so that the NOx emission value of a burner or the boiler is low.

Description

Technical field [0001] The invention relates to the technical field of gas fuel combustion, in particular to a low NO x Gas burner and its reduction in boiler NO x Method of emission. Background technique [0002] With the increasing depletion of coal resources, coupled with the coal burning process will emit a large amount of NO x Pollutants are very harmful. Therefore, my country is increasingly considering the use of cleaner gas fuels such as natural gas in energy utilization. [0003] Although natural gas basically does not contain sulfur and dust, and does not emit sulfur dioxide and dust pollutants, it still produces NO during the combustion process x , It also has certain pollution to the atmosphere. [0004] For the needs of environmental protection, various countries have developed various low-NO x Gas burners mainly use technologies such as air classification, fuel classification, premixed combustion and flue gas recirculation. With the increasing environmental protection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/02F23D14/46
CPCF23D14/02F23D14/46
Inventor 方毅波张光学严志雄陈力施嘉能杜志华俞海玲
Owner HANGZHOU ZHEDA TIANYUAN SCI & TECH
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