KR101879024B1

KR101879024B1 - Burner for reducing nox and high efficiency and combstion equipment having the same

Info

Publication number: KR101879024B1
Application number: KR1020150181589A
Authority: KR
Inventors: 신명철; 이진기; 임대원
Original assignee: 한국생산기술연구원
Priority date: 2015-12-18
Filing date: 2015-12-18
Publication date: 2018-07-16
Also published as: KR20170073104A

Abstract

The present invention provides a burner for reducing nitrogen oxides. Wherein the burner for reducing nitrogen oxides comprises: a gas flow tube; An air flow tube formed around the gas flow tube; A shield plate disposed at an upper end of the air flow tube; And a spark portion formed radially from the upper end of the gas flow tube along the side of the air flow tube for mixing gas flowing along the gas flow tube and air flowing along the air flow tube to ignite. In addition, the present invention provides a combustion facility that dramatically reduces nitrogen oxides through a large amount of exhaust gas recirculation.

Description

TECHNICAL FIELD [0001] The present invention relates to a high-efficiency nitrogen oxide reduction type burner and a combustion apparatus having the burner,

The present invention relates to a burner having a high combustion efficiency and a very low NOx emission concentration, and more particularly, to a burner having a low carbon monoxide emission concentration even at a low air ratio compared to a fuel amount, It is possible to reduce the amount of carbon dioxide generated due to the fuel reduction when used in an industrial boiler, etc. Further, even when a large amount of exhaust gas is recirculated and the combustion chamber is used in a very small flow-rate boiler, a highly efficient nitrogen oxide- Burner and combustion equipment having the same.

The conventional nitrogen oxide reduction technique for industrial burners suppresses the reaction of nitrogen in order to reduce the thermal nitrogen generated by the reaction of nitrogen contained in the combustion air with excess oxygen in a high temperature furnace, An incomplete combustible material generated by a shortage is injected with sufficient combustion air from the downstream side in the furnace where the temperature in the furnace is relatively lowered to completely burn the furnace.

A combustion atmosphere at a relatively low temperature is formed in the front portion of the burner based on the entire furnace to suppress the generation of nitrogen oxides and to supply the primary combustion air to maintain the fuel excess and the air shortage state. Secondary combustion air is supplied to completely combust the incomplete combustibles generated at this time.

The presently practiced method as a method for forming an excess fuel or air shortage in the front part of the burner is a combustion gas recirculation method in which a part of the primary burned gas is mixed with the combustion air and re- , A nitrogen oxide reduction method in which a portion of the combustion air is directly sent to a hole provided in the upper portion of the burner to completely burn the incompletely combusted combustion gas in the burner region and an aerodynamic method in which the combustion air is dividedly supplied in the burner, And a low nitrogen oxide burner that reduces the production of nitrogen oxides by controlling the mixing characteristics of the fuel. The combustion gas recirculation method and the nitrogen oxide reduction method have a high effect of reducing nitrogen oxides. However, It is necessary to install additional equipment, so it is economically burdened, . Therefore, in recent years, an aerodynamic method which can reduce nitrogen oxides without additional equipments merely by structural change by aerodynamic considerations inside the burner is preferred.

A prior art related to the present invention is Korean Patent Laid-Open Publication No. 10-2000-0045131 (published on July 15, 2000).

An object of the present invention is to provide a gas injection apparatus for a gas injection apparatus which is capable of radially forming a plurality of gas outlets in the direction of a gas injection tube formed in a lower portion of a bolometer structure and that vertically rising air is injected horizontally, A burner for reducing the amount of carbon monoxide generated by improving the stability of the flame by preventing mixing delays from occurring in the flame, and a combustion apparatus having the same.

Another object of the present invention is to provide a high-efficiency nitrogen oxide reduction type burner having a very low nitrogen oxide emission concentration even when the combustion chamber is used in a very small flow-through boiler by recycling a large amount of exhaust gas and a combustion facility having the same .

In a preferred embodiment, the present invention provides a burner for reducing high-efficiency nitrogen oxides.

Wherein the burner for reducing nitrogen oxides comprises: a gas flow tube; An air flow tube formed around the gas flow tube; A shield plate disposed at an upper end of the air flow tube; And a spark portion formed radially from the upper end of the gas flow tube along the side of the air flow tube for mixing gas flowing along the gas flow tube and air flowing along the air flow tube to ignite.

The ignition portion may include a plurality of gas discharge pipes disposed at the lower portion of the gas flow pipe and disposed at the upper portion of the gas flow pipe, and a plurality of gas discharge ports formed in the plurality of gas discharge pipes, .

Preferably, the air flow tubes are formed in a plurality of directions along a direction radially outside the gas flow tubes.

In the air flow tube formed in multiple, it is preferable that the air flow tube exposed to the ignition portion is adjacent to the gas flow tube.

It is preferable that the protective plate is formed to be inclined downward along the gas flow pipe.

In another embodiment, the present invention relates to the above-described burner for nitrogen oxide reduction; A boiler having a combustion section connected to the burner; A fuel supply line for supplying fuel to the burner; A gas discharge line through which exhaust gas is discharged from the boiler after it is burned; And a recirculation line which is branched from the gas discharge line and supplies the discharged gas to the burner for recirculation.

In addition, it is preferable that the exhaust gas recovered from the exhaust stack is mixed with the combustion air, and the mixed air and the exhaust gas travel along the air flow pipe to mix with the fuel and ignite in the ignition part.

The recirculation line is preferably provided with a blower for forcibly supplying the exhaust gas to the burner.

In the present invention, a plurality of gas outlets are radially formed in the direction of the gas injection tube formed at the lower portion of the brazed structure, and the vertically rising air is rapidly mixed with the horizontally injected gas and the flame- It is possible to prevent the mixing delay from being generated inside, thereby improving the degree of flame stabilization and reducing the amount of carbon monoxide generated.

Further, the present invention has a low carbon monoxide emission concentration even at a low air ratio compared to a fuel amount in accordance with high flame stabilization, and has a fuel reduction effect and a carbon dioxide generation reduction effect through a high combustion efficiency.

In addition, since a large amount of exhaust gas is recycled and utilized, the flame temperature is lowered and the amount of nitrogen oxide generated is reduced, so that air pollution is not caused.

1 is a view showing a burner for reducing nitrogen oxides according to the present invention.
2 is a view showing an exhaust recirculation structure according to the present invention.

Hereinafter, a burner for reducing nitrogen oxides according to the present invention will be described with reference to the accompanying drawings.

1 is a view showing a burner for reducing nitrogen oxides according to the present invention.

Generally, the combustion unit supplies the recoverable oil to the burner 210 to drive the burner 210 to burn it.

Referring to Fig. 1, the burner 210 of the present invention will be described.

The burner 210 of the present invention is a burner for reducing nitrogen oxides.

The nitrogen oxide reduction burner 210 includes a gas flow pipe 211, an air flow pipe 212 formed around the gas flow pipe 211, a chopping plate 213 disposed at an upper end of the air flow pipe 212, A gas flowing along the gas flow pipe 211 and a gas flowing radially along the air flow pipe 212 at an upper end of the gas flow pipe 211, And a spark portion 214 for mixing and igniting.

The ignition part 214 includes a plurality of gas discharge pipes 214a disposed at an upper portion of the gas flow pipe 211 at a lower portion of the shield plate 213 and a plurality of gas discharge pipes 214a And a plurality of gas outlets 214b for mixing the gas and air to ignite.

Further, the air flow pipe 212 is formed in multiple along the direction of the radial direction of the gas flow pipe 211. 1, the air flow pipe 212 communicates (communicates) with the pipe 290 located at the center of the burner 210 so that the air and the recovered exhaust gas flow into the pipe 290, And the outer periphery of the gas flow tube.

Particularly, in the air flow tube 212 formed in multiple, the air flow tube 212 exposed to the ignition portion 214 is disposed adjacent to the gas flow tube 211.

The protective plate 213 is formed to be inclined downward along the gas flow pipe 211.

2 is a view showing an exhaust recirculation structure according to the present invention.

Referring to Fig. 2, a combustion apparatus having an exhaust recirculation structure of the present invention will be described.

The combustion apparatus includes a boiler 230 having the burner 210 for reducing nitrogen oxides described above, and a combustion unit 220 connected to the burner 210; A fuel supply line 240 for supplying fuel to the burner 210 and a gas discharge line 250 for discharging exhaust gas from the boiler 230 after being burned and a gas discharge line 250 branched from the gas discharge line 250 And a recirculation line for supplying the discharged exhaust gas to the burner 210 and recirculating the exhaust gas.

Here, the exhaust gas recovered from the exhaust stack is mixed with the combustion air, and the mixed air and the exhaust gas move along the air flow pipe and are mixed with the fuel, and can be ignited in the ignition portion 214.

The recirculation line 260 may be provided with a blower for forcibly supplying the exhaust gas and the air to the burner.

That is, the exhaust gas and the air are mixed and supplied to the burner 210.

Through the above-described constitution and operation, in the embodiment of the present invention, a plurality of gas outlets are radially formed in the direction of the gas injection tube formed in the lower portion of the armoring structure, and the vertically rising air is horizontally injected Gas is mixed with the combustion gas to prevent mixing delay, thereby reducing the amount of carbon monoxide generated and improving the degree of flame stabilization.

In addition, the embodiment of the present invention has an advantage that palm oil having a low octane number can be efficiently used as a power generation fuel.

In addition, since the exhaust gas is recycled and utilized, the flame temperature is lowered and the amount of nitrogen oxide generated is reduced, so that there is an advantage that air pollution is not caused.

That is, the exhaust gas is recycled through the exhaust gas recirculation structure to be injected into the burner together with the combustion air, thereby greatly reducing the nitrogen oxides.

It is to be understood that the above-described embodiments are illustrative in all aspects and should not be construed as limiting, and the scope of the present invention is indicated by the appended claims rather than by the detailed description, and the meaning and scope of the claims and their equivalents All changes or modifications that come within the scope of the present invention should be construed as being included within the scope of the present invention.

210: Burner
211: gas flow tube
212: air flow tube
213:
214:
220:
230: Boiler
240: fuel supply line
250: discharge line
260: recirculation line

Claims

Gas flow tube;
An air flow tube formed on an outer periphery of the gas flow tube;
A shield plate disposed on an outer side of an upper opening of the gas flow tube and having an upper surface formed to be inclined downward along the gas flow tube; And
A gas flowing radially from the upper end of the gas flow tube along the air flow tube side and flowing along the gas flow tube; an air flowing along the air flow tube and a flue gas; And an ignition part for igniting the mixture,
Wherein,
A plurality of gas discharge pipes arranged at the lower portion of the protective plate, the gas discharge pipes being disposed at the upper portion of the gas flow pipe; And
And a plurality of gas outlets formed in the plurality of gas discharge pipes and spraying the gas in a horizontal direction,
The air and the recovered exhaust gas rise vertically through the air flow pipe and the gas is horizontally injected through the gas exhaust port so that the air and the recovered exhaust gas and the gas are mixed well, To prevent delay from occurring,
The air flow tube is formed in multiple peripheries of the gas flow tube, and the air flow tube communicates with the pipe 290 located at the center of the burner 210, so that the air and the recovered exhaust gas pass through the pipe 290 and the gas Wherein the flow rate of the nitrogen oxide is increased through the outer periphery of the flow tube.

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The method according to claim 1,
In the air flow tube formed in multiple,
Wherein the air flow tube exposed to the ignition portion is adjacent to the gas flow tube.

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A burner for reducing nitrogen oxides according to any one of claims 1 to 4;
A boiler having a combustion section connected to the burner;
A fuel supply line for supplying fuel to the burner;
A gas discharge line through which exhaust gas is discharged from the boiler after it is burned; And
And a recirculation line which is branched from the gas discharge line and supplies the discharged exhaust gas to the burner and mixes and recirculates the air.

The method according to claim 6,
The mixed air and the exhaust gas mixed with the combustion air are moved along the air flow pipe, mixed with the fuel, and are ignited in the ignition part by mixing the exhaust gas recovered from the exhaust stack with the combustion air.

The method according to claim 6,
In the recirculation line,
And a blower for forcibly supplying the exhaust gas to the burner is provided.