CN214147860U - Flue gas internal circulation type low-nitrogen combustion device - Google Patents

Abstract

The utility model relates to a flue gas inner loop formula low-nitrogen combustion device, be equipped with the flue gas internal reflux sunction inlet on the chamber wall, the intracavity is equipped with the gas passageway, combustion-supporting wind passageway and penetrate the combustor laryngeal opening of inhaling formula flue gas inner loop device, penetrate and inhale formula flue gas inner loop device and contain the L type flue gas pipe that comprises horizontal flue gas intake pipe and vertical flue gas outlet duct handing-over interconnection and the venturi tube that comprises the reducing pipe and the straight-through pipe interconnection that alternates and set firmly on L type flue gas pipe handing-over department chamber wall, most combustion-supporting air accelerates when flowing through each and penetrates and inhale formula flue gas inner loop device periphery, produce the negative pressure, the subtotal accelerates when flowing through venturi tube convergent combustion-supporting wind pipe, produce the negative pressure in vertical flue gas outlet duct, under dual negative pressure effect, make the peripheral flue gas of laryngeal opening inhale and flow back by horizontal flue gas intake pipe and mix in vertical flue gas outlet duct, And mixed into a combustion-supporting air channel under the action of the surrounding negative pressure to form oxygen-poor combustion-supporting gas, and then the oxygen-poor combustion-supporting gas is injected into a hearth to participate in low-nitrogen combustion.

Description

Flue gas internal circulation type low-nitrogen combustion device

Technical Field

The utility model relates to a boiler burner technical field, especially one kind have with combustor throat outside regional flue gas entrainment guide to throat in, with combustion air mix after jet into furnace participate in the low nitrogen burning, help reducing NOx formation function penetrate inhale and inhale formula flue gas internal reflux low nitrogen combustion device.

Background

Nitrogen oxides (NOx) contained in exhaust gas discharged from boilers using fossil resources such as natural gas, coal, petroleum and the like as fuel are recognized as atmospheric pollutants, and the increasingly strict exhaust emission standards are established for the purpose of strict control by functional departments, and it is proposed that NOx emission must be reduced to 30mg/Nm³The following standard requirements. In view of the above, it is common in the industry to adopt a method of providing a low-nitrogen combustion technology device on an existing boiler and performing low-nitrogen standard improvement, and to find a theoretical basis that appropriately reducing the flame temperature in the fuel combustion process and the oxygen content of the combustion gas contribute to the reduction of the amount of NOx generated. For a gas boiler taking high-calorific-value gas such as natural gas and the like as fuel, a low-nitrogen route of a low-nitrogen burner and a flue gas external circulation technology is adopted at present, wherein the flue gas external circulation technology is realized by leading part of flue gas to be discharged with relatively low temperature and oxygen content from the tail of the boiler to return to a hearth for participating in mixed combustion. However, in practice, when the boiler adopts the flue gas external circulation technology, external circulation parts including a flue gas circulating fan, a flue gas circulating pipeline and the like must be additionally arranged on the boilerTreat that outer exhaust flue gas guide is carried the specific position department of combustor and the relevant part of boiler with the part, it is more troublesome and the transformation cost is also higher to set up, in addition, owing to there is the relation of difference in temperature between by the mist, can produce the comdenstion water during the mixture, need extra loss energy when having the moisture evaporation except, still can lead to corroding component on every side, also lead to having the big and higher drawback of daily use cost of daily maintenance work volume, so, consider from practicality and economic nature angle, all owe the ideal.

Disclosure of Invention

The utility model discloses an it is not enough to overcome existing among the current low-nitrogen combustion technology, provide one kind have with near the throat peripheral flue gas inhale roll backward flow get into the throat oral cavity, with combustion air mix after the injection get into furnace participate in the low-nitrogen combustion, help reducing the low-nitrogen burner of formula flue gas internal reflux that penetrates of NOx formation.

The utility model discloses a flue gas inner loop formula low-nitrogen combustion device, the main part includes the combustor throat, links to each other with gas spray gun inlet end, fills arbitrary gas channel by the gas pipe, fills arbitrary combustion-supporting wind passageway by being located gas pipe outlying combustor throat ring chamber, its characterized in that still including setting up the flue gas internal reflux sunction inlet on combustor throat chamber wall and setting up the formula flue gas inner loop device that jets that inhales in combustor throat intracavity, wherein:

the burner throat main body is cylindrical, a fuel gas channel filled by the fuel gas pipe is fixedly arranged on the axis position of the burner throat main body, and a plurality of smoke gas internal reflux suction inlets are arranged on the wall of the tail end cavity close to one side of the furnace wall according to requirements;

the jet-suction type smoke gas internal circulation device is fixedly arranged on the inner side wall of the throat opening of the burner, which corresponds to the arrangement position of the smoke gas internal reflux suction inlet, and comprises an L-shaped smoke gas pipe and a Venturi type gradually-reduced combustion-supporting air pipe, wherein the L-shaped smoke gas pipe is formed by the connection and interconnection of a main body and a horizontal smoke gas inlet pipe as well as a longitudinal smoke gas outlet pipe, and the Venturi type gradually-reduced combustion-supporting air pipe is formed by coaxially interconnecting a reducing pipe and a straight-through pipe which is fixedly inserted on the wall of the L-shaped connection and interconnection position of the horizontal smoke gas inlet pipe and the longitudinal smoke gas outlet pipe;

in addition, the injection-suction type smoke internal circulation device is fixedly welded with the edge of the smoke internal reflux suction inlet through the end part of the horizontal smoke gas inlet pipe and is fixedly arranged in the combustion-supporting air channel of the burner throat.

When the gas spraying device works, gas is fed into each gas spraying gun through the gas pipe and is supplied to each gas spraying gun; combustion-supporting air enters from the tail end of the throat and flows forwards in the combustion-supporting air channel, most of the combustion-supporting air flows forwards at the periphery of the injection-suction type smoke internal circulation devices, the combustion-supporting air is accelerated continuously due to the reduction of the flow area when flowing through each injection-suction type smoke internal circulation device, and negative pressure capable of sucking mixed gas in the tube into the combustion-supporting air channel is generated at the periphery of the longitudinal smoke outlet pipe; a small part of the gas flow is aligned with the port of the reducing pipe of the Venturi type reducing combustion-supporting air pipe, flows in along the same direction, is accelerated by the reducing pipe to form high-speed gas flow, then flows out through the straight-through pipe and enters the longitudinal flue gas outlet pipe, and negative pressure capable of sucking gas in the horizontal flue gas inlet pipe into the longitudinal flue gas outlet pipe is generated in the longitudinal flue gas outlet pipe; therefore, under the action of double negative pressure, the smoke at the periphery of the throat is sucked and swirled by the horizontal smoke inlet pipe and flows back into the longitudinal smoke outlet pipe, is mixed with high-speed combustion-supporting air from the straight-through pipe, enters the combustion-supporting air channel under the suction action of the negative pressure at the periphery of the longitudinal smoke outlet pipe, and is converged with most of the continuously accelerated combustion-supporting air to form a mixed smoke flow with a certain flow speed and a certain oxygen content, and the mixed smoke flow is injected into a hearth forwards and participates in low-nitrogen combustion which is beneficial to inhibiting and reducing the generation amount of NOx.

Based on the above concept the utility model discloses penetrate and inhale low-nitrogen burner of backward flow in formula flue gas, owing to be provided with a plurality of flue gas internal reflux sunction inlets on combustor laryngeal aperture wall as required, it corresponds continuously to set firmly a plurality of and flue gas internal reflux sunction inlets in combustor laryngeal aperture intracavity, it gets into in the combustor laryngeal aperture to have to inhale the peripheral flue gas of roll laryngeal aperture, and penetrate and inhale formula flue gas inner circulation device with combustion-supporting air mixing function, the during operation can be sucked the peripheral flue gas of laryngeal aperture and be drawn into the laryngeal aperture intracavity and mix with the combustion-supporting air that is advancing at a high speed, the oxygen content in the combustion-supporting gas has effectively been reduced, thereby ensure to realize effectively inhibiting the low-nitrogen burning of NOx formation volume, provide technical guarantee for the up-to-standard transformation of boiler. The technical scheme of the utility model, simple structure and scientific and reasonable, work safe and reliable and degree of automation are high, can reach and reduce the substantive effect that NOx discharged through the flue gas inner loop, have filled the trade blank, have very strong practicality and extensive market perspective.

Drawings

Fig. 1 is a schematic diagram of the basic structure of the embodiment of the present invention;

FIG. 2 is a partial sectional view A-A of FIG. 1;

FIG. 3 is a schematic structural view of an injection-suction type smoke internal circulation device in an embodiment of the present invention;

FIG. 4 is a view in the direction A of FIG. 3;

fig. 5 is a schematic diagram of the operation of the embodiment of the present invention.

In the figure:

1. burner throat 2, gas channel 21, gas pipe 3, combustion-supporting air channel

4. Smoke internal reflux suction inlet 5, jet-suction type smoke internal circulation device 51, L-shaped smoke pipe

511. Horizontal flue gas inlet pipe 512, longitudinal flue gas outlet pipe

52. Venturi type reducing combustion-supporting air pipe 521, reducing pipe 522, straight-through pipe 6 and furnace wall

Detailed Description

The invention will be further described with reference to the accompanying drawings and exemplary embodiments.

In fig. 1 to fig. 5, the utility model discloses a low nitrogen combustion device of flue gas inner loop formula, the main part includes combustor throat 1, links to each other with gas spray gun inlet end, by gas pipe 21 fill gas channel 2, by being located gas pipe 21 outlying combustor throat ring cavity fill combustion-supporting wind passageway 3 of taking care of, its characterized in that still flows back sunction inlet 4 and sets up the formula flue gas inner loop device 5 of penetrating of 1 intracavity in combustor throat including setting up in the flue gas on the wall of 1 chamber of combustor throat, wherein:

the burner throat 1 is cylindrical, a gas channel 2 filled by the gas pipe 21 is fixedly arranged on the axis position of the burner throat, and a plurality of smoke internal reflux suction inlets 4 are arranged on the cavity wall close to the tail end on one side close to the furnace wall 6 as required;

the jet-suction type smoke gas internal circulation device 5 is fixedly arranged on the inner side wall of the throat 1 of the burner corresponding to the arrangement position of the smoke gas internal reflux suction inlet 4, and comprises an L-shaped smoke gas pipe 51 formed by the connection and interconnection of a horizontal smoke gas inlet pipe 511 and a longitudinal smoke gas outlet pipe 512 as a main body, and a Venturi type gradually-reduced combustion-supporting air pipe 52 formed by coaxially interconnecting a reducing pipe 521 and a straight-through pipe 522 which is fixedly inserted on the wall of the L-shaped connection and interconnection position of the horizontal smoke gas inlet pipe 511 and the longitudinal smoke gas outlet pipe 512;

in addition, the injection-suction type flue gas internal circulation device 5 is fixedly welded and connected with the edge of the flue gas internal reflux suction inlet 4 through the end part of the horizontal flue gas inlet pipe 511 and is arranged in the combustion-supporting air channel 3 of the burner throat 1.

When in work, the fuel gas is fed into each fuel gas spray gun through the fuel gas pipe 21 and is supplied to each fuel gas spray gun; combustion-supporting air enters from the tail end of a throat 1 of the burner and flows forwards in a combustion-supporting air channel 3, most of the combustion-supporting air flows forwards at the periphery of the injection-suction type smoke internal circulation devices 5, the combustion-supporting air continuously accelerates due to the reduction of the flow area when flowing through each injection-suction type smoke internal circulation device 5, and negative pressure capable of sucking gas in the smoke pipe into the combustion-supporting air channel 3 is generated at the periphery of a longitudinal smoke outlet pipe 512; a small part of the gas flow is aligned with the port of the reducing pipe of the Venturi type reducing combustion-supporting air pipe 52, flows in along the same direction, is reduced by the reducing pipe 521 and accelerated to form high-speed gas flow, then flows out through the straight-through pipe 522 and enters the longitudinal flue gas outlet pipe 512, and negative pressure capable of sucking gas in the horizontal flue gas inlet pipe 511 into the longitudinal flue gas outlet pipe 512 is generated in the longitudinal flue gas outlet pipe 512; therefore, under the action of double negative pressure, the smoke at the periphery of the throat is sucked and swirled back to flow into the longitudinal smoke outlet pipe 512 through the horizontal smoke inlet pipe 511, is mixed with high-speed combustion-supporting air from the straight-through pipe 522, enters the combustion-supporting air channel under the suction action of the negative pressure at the periphery of the longitudinal smoke outlet pipe 512, and is converged with most of the continuously accelerated combustion-supporting air to form a mixed smoke flow with a certain flow speed and a certain oxygen content, and the mixed smoke flow is injected into a hearth forwards and participates in low-nitrogen combustion which is beneficial to inhibiting and reducing the generation amount of NOx.

Claims (2)

1. The utility model provides a flue gas inner loop formula low NOx combustion device, the main part includes combustor throat (1), link to each other with gas spray gun inlet end, gas channel (2) by gas pipe (21) fill, by being located gas pipe (21) outlying combustor throat ring chamber fill combustion-supporting wind passageway (3) of filling, its characterized in that still flows backward sunction inlet (4) and sets up penetrating suction type flue gas inner loop device (5) in combustor throat (1) intracavity including setting up in the flue gas on combustor throat (1) chamber wall, wherein:

the burner throat (1) is cylindrical, a gas pipe which is used as a gas channel (2) and is filled by the gas pipe (21) is fixedly arranged on the axis position of the burner throat, and a plurality of smoke internal reflux suction inlets (4) are arranged on the near-tail end circular cavity wall close to one side of the furnace wall (6) as required;

the jet-suction type smoke gas internal circulation device (5) is fixedly arranged on the corresponding inner side wall of a throat opening (1) of the burner and the smoke gas internal reflux suction inlet (4), and comprises an L-shaped smoke gas pipe (51) and a Venturi type gradually-reducing combustion-supporting air pipe (52), wherein the main body of the L-shaped smoke gas pipe is formed by interconnecting a horizontal smoke gas inlet pipe (511) and a longitudinal smoke gas outlet pipe (512) in a cross mode, and the Venturi type gradually-reducing combustion-supporting air pipe (52) is formed by coaxially interconnecting a reducing pipe (521) and a straight-through pipe (522) which is fixedly inserted on the wall of the L-shaped interconnection junction of the horizontal smoke gas inlet pipe (511) and the longitudinal smoke gas outlet pipe (512).

2. The smoke internal circulation type low-nitrogen combustion device according to claim 1, wherein the injection-suction type smoke internal circulation device (5) is fixedly welded and connected with the edge of the smoke internal reflux suction inlet (4) through the end of the horizontal smoke inlet pipe (511) and is fixedly arranged in the combustion-supporting air channel (3) of the burner throat (1).

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