CN211600688U

CN211600688U - Multistage preheating dual-mode low-NOx self-preheating burner

Info

Publication number: CN211600688U
Application number: CN201922194332.9U
Authority: CN
Inventors: 潘景新
Original assignee: Hangzhou Zhongjing Technology Co ltd
Current assignee: Hangzhou Zhongjing Technology Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-09-29
Anticipated expiration: 2029-12-09

Abstract

The utility model relates to a multistage preheating double mode low NOx self preheats nozzle belongs to industrial burner technical field, the industrial furnace kiln of trades such as mainly used steel and iron, coloured, machinery, aviation, forging, pottery. The utility model discloses in the one end at flue gas guiding device is installed to the nozzle casing, the other end at flue gas guiding device is installed to the brick, the nozzle core is installed on the brick, air flue gas divertor is installed in the nozzle casing, and air flue gas divertor and the cooperation of flue gas guiding device, the one end of heat exchanger is installed on the air flue gas divertor, the other end and the brick of heat exchanger are connected, the one end of air draft tube is installed on the nozzle casing, the other end of air draft tube is located the heat exchanger, the one end of nozzle end cover and air cylinder is all installed on the nozzle casing, the pipe of discharging fume is installed in the air cylinder, the pipe of discharging fume is connected with the air flue gas divertor.

Description

Multistage preheating dual-mode low-NOx self-preheating burner

Technical Field

The utility model relates to a multistage preheating double mode low NOx self preheats nozzle belongs to industrial burner technical field, the industrial furnace kiln of trades such as mainly used steel and iron, coloured, machinery, aviation, forging, pottery.

Background

At present most self preheat the nozzle, and the flue gas circulates in outermost cavity of nozzle shell, and it is high to have nozzle shell temperature, and the resistance is big, and heat exchange efficiency is lower relatively, and nozzle power is drawback such as little, and the nozzle grading effect is not good simultaneously, and flame is short, the temperature is low, and NOx discharges highly, and the nozzle exit structure anti high temperature ability is poor. In addition, the flameless mode gas pipe extends to the nozzle, is easy to burn out, has short service life and the like, such as the utility model of the novel patent 201811304912.2, which influences the popularization and application of the flameless mode gas pipe on the high-temperature high-performance large-scale industrial furnace.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a burner is preheated to double mode low NOx self in multistage preheating of structural design reasonable.

The utility model provides a technical scheme that above-mentioned problem adopted is: this multistage preheating double mode low NOx self preheats nozzle, including nozzle shell, air flue gas divertor, heat exchanger, air draft tube, flue gas guiding device, nozzle end cover, nozzle core, brick flower, air section of thick bamboo and the pipe of discharging fume, its structural feature lies in: the utility model discloses a gas burner, including nozzle shell, air flue gas divertor, heat exchanger, air flue gas divertor, nozzle end cover and air cylinder, the one end at flue gas divertor is installed in the nozzle shell, the other end at flue gas divertor is installed to the brick, the nozzle core is installed on the brick, air flue gas divertor is installed in the nozzle shell, and air flue gas divertor and flue gas divertor cooperation, the one end of heat exchanger is installed on the air flue gas divertor, the other end of heat exchanger is connected with the entry end of brick, the one end of air draft tube is installed on the nozzle shell, the other end of air draft tube is located the heat exchanger, the one end of nozzle end cover and air.

Furthermore, the burner core is connected with the inlet end of the brick, the heat exchanger is arranged in the air flue gas flow guider, and the air flow guiding cylinder is arranged in the heat exchanger.

Further, an air final-stage preheating channel is formed between the outer wall of the air guide cylinder and the inner wall of the heat exchanger.

Further, an air flue gas deflector outer cavity is arranged outside the air flue gas deflector, an air flue gas deflector inner cavity is arranged inside the air flue gas deflector, the air flue gas deflector outer cavity is communicated with the air flue gas deflector inner cavity, a burner shell inner cavity is arranged inside the burner shell, an air barrel inner cavity is arranged between the outer wall of the smoke exhaust pipe and the inner wall of the air barrel, the air barrel inner cavity is communicated with the burner shell inner cavity, and one end of the smoke exhaust pipe is communicated with the air flue gas deflector outer cavity.

Further, the outer cavity of the air flue gas flow guider is a secondary flue gas heat exchange channel, and an air secondary preheating channel is formed between the outer wall of the air flue gas flow guider and the inner wall of the burner shell.

Furthermore, the other end of the smoke exhaust pipe is a smoke outlet, a smoke outlet channel is arranged inside the smoke exhaust pipe, smoke exhaust pipe fins are installed on the outer wall of the smoke exhaust pipe and located in the inner cavity of the air cylinder, an air inlet is formed in the air cylinder, and the air inlet is communicated with the inner cavity of the air cylinder.

Furthermore, the smoke exhaust pipe fins are arranged in a spiral structure, and divide the inner cavity of the air cylinder into primary air preheating channels.

Further, the shell of the flue gas flow guiding device is made of a metal material, and a refractory material is arranged in the shell; or the shell of the flue gas guide device is made of a heat-resistant alloy material, and the shell is connected with the burner shell through a flange.

Further, a flue gas diversion cavity is arranged in the flue gas diversion device and communicated with an inner cavity of the air flue gas diversion device, the other end of the heat exchanger is positioned in the flue gas diversion cavity, and the burner core and the flower bricks are both positioned in the flue gas diversion cavity and are both matched with the other end of the heat exchanger.

Further, an air guide cylinder fin is arranged on the outer wall of the air guide cylinder; the fins of the air guide cylinder are arranged in a circumferential array; or the air guide cylinder fins are spirally arranged; or the fins of the air guide cylinder are arranged in a circumferential array shape and a spiral shape in a combined manner; or the fins of the air guide cylinder are arranged in a ladder shape, and when the fins of the air guide cylinder are arranged in the ladder shape, sieve mesh-shaped structures are arranged at the horizontal positions of the fins of the air guide cylinder and the air guide cylinder.

Furthermore, the heat exchanger is of a cylindrical structure, heat exchanger fins are arranged on the outer wall of the heat exchanger, a ring sleeve is installed at the other end of the heat exchanger, and the ring sleeve is in contact fit with the flower bricks.

Furthermore, a primary flue gas heat exchange channel is formed between the outer wall of the heat exchanger and the inner cavity of the air flue gas flow guider and the flue gas flow guiding cavity.

Furthermore, a baffle is installed at one end of the burner core, a refractory material protective layer is arranged at the other end of the burner core, the end of the burner core is matched with the brick tiles, a boss is installed on the baffle, a central hole is formed in the boss, a plurality of primary air holes are formed in the circumferential direction of the boss and are all arranged on the baffle, the number of the primary air holes is m, the value range of m is 4-12, one end of each primary air hole is communicated with the inner cavity of the heat exchanger, the other end of each primary air hole is communicated with the combustion cavity, a plurality of splitter vanes are arranged on the outer wall of the burner core, the splitter vanes are arranged in a circumferential array along the axis of the burner core, a secondary air channel is formed between every two adjacent splitter vanes, the number of the secondary air channels is n, the value range of n is 3-24, one end of each secondary air channel is communicated with the inner cavity of the heat exchanger, the other end of the secondary air channel is communicated with the combustion cavity.

Further, be provided with the burning chamber on the brick flower, the burning chamber is the setting of horn mouth column structure, the circumference in burning chamber is provided with a plurality of air passage, air passage's quantity is x, the value scope of x is 4-16, the air passage slope sets up, the axis of air passage is alpha with the contained angle of the axis in burning chamber, alpha's value scope is 0-20, be provided with a plurality of flue gas passageway on the outer wall of brick flower, flue gas passageway is fan-shaped structure setting, flue gas passageway's quantity is y, y's value scope is 4-12.

Furthermore, the two ends of the combustion cavity are respectively a combustion cavity outlet and a combustion cavity inlet.

Further, be provided with the one-level gas pipe on the nozzle end cover, install the second grade gas pipe in the one-level gas pipe, the one end of one-level gas pipe communicates with each other with the gas interface on the nozzle end cover, the one end of second grade gas pipe is exposed in the nozzle end cover, the other end and the nozzle core of one-level gas pipe are connected, the other end and the nozzle core of second grade gas pipe run through, and be located the brick flower, install ignition on the nozzle end cover, ignition's one end is exposed in the nozzle end cover, ignition's the other end and nozzle core are connected, install flame monitoring device on the nozzle end cover.

Furthermore, the primary gas pipe and the ignition device are both positioned in the air guide cylinder, and the burner end cover is provided with a flame monitoring device.

Compared with the prior art, the utility model has the advantages of it is following:

1. the air cylinder is sleeved outside the smoke exhaust pipe, the air subjected to primary heat exchange is outside the smoke exhaust pipe, and the high-temperature smoke is in the smoke exhaust pipe, so that the temperature of the outer wall of the air cylinder is low, the air passes through the spiral channel, and the heat exchange path is lengthened; after primary preheating, air enters the burner shell and the air flue gas flow director to perform secondary heat exchange, and finally enters the heat exchanger and the air flue gas flow director to perform final heat exchange (three-stage), so that the heat exchange path, the heat exchange area and the heat exchange efficiency are greatly improved, the air preheating temperature is improved, the combustion efficiency is increased, and the heat efficiency and the energy utilization rate are improved.

2. When primary air and secondary air are preheated, the air circulation channel is arranged outside the air flue gas flow guider, and the flue gas circulation channel is arranged in the air flue gas flow guider, so that the flue gas circulation resistance is reduced, the smoke discharge is smoother, the temperature of the outer wall of the burner is greatly reduced, the service life of the burner is prolonged, the working environment of the burner is improved, and the burner is more friendly to use and operate.

3. The fins are arranged on the outer wall of the air guide cylinder, and various structural forms (circumferential array, spiral, combination of spiral and circumferential array and step shape) are adopted, so that the heat exchange efficiency and the service performance of the burner can be optimized according to different use conditions and use occasions.

4. The preheated air can enter the combustion chamber through the burner core for one time and two times to be mixed with the primary fuel gas, and the tertiary air directly enters the heating space through the air channel to be mixed and combusted with the mixed air fuel gas sprayed from the combustion chamber, so that the multistage mixing is really realized, and the generation of NOx is reduced to the maximum extent. Or the preheated air and the secondary fuel gas are sprayed into the heating space to form diffusion combustion, and the generation of ultra-low NOx is realized.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of a multistage preheating dual-mode low NOx self-preheating burner in which air guide cylinder fins are arranged in a circumferential array when a flue gas guide device of an embodiment of the present invention is made of a refractory material embedded in a metal casing.

Fig. 2 is a schematic cross-sectional structure view of a multistage preheating dual-mode low NOx self-preheating burner in which fins of an air guide cylinder are arranged in a step shape when a flue gas guide device of an embodiment of the present invention is made of a refractory material built in a metal casing.

Fig. 3 is a schematic cross-sectional structure diagram of a multi-stage preheating dual-mode low NOx self-preheating burner in which a circumferential array of air guide cylinder fins and a spiral are combined when the flue gas guiding device of the embodiment of the present invention is made of a refractory material embedded in a metal casing.

Fig. 4 is a left side view structural diagram of the multi-stage preheating dual-mode low NOx self-preheating burner in the case where the flue gas guiding device of the embodiment of the present invention is made of a refractory material embedded in a metal casing.

Fig. 5 is a schematic right-view structural diagram of a multi-stage preheating dual-mode low NOx self-preheating burner in the case where the flue gas guiding device of the embodiment of the present invention is made of a refractory material embedded in a metal casing.

Fig. 6 is a schematic cross-sectional structure view of a multistage preheating dual-mode low NOx self-preheating burner in which air guide cylinder fins are arranged in a circumferential array when a housing of a flue gas guide device according to an embodiment of the present invention is made of a heat-resistant alloy material.

Fig. 7 is a schematic cross-sectional structure view of a multistage preheating dual-mode low NOx self-preheating burner in which fins of an air guide cylinder are arranged in a step shape when a housing of a flue gas guide device according to an embodiment of the present invention is made of a heat-resistant alloy material.

Fig. 8 is a schematic cross-sectional structure diagram of a multistage preheating dual-mode low NOx self-preheating burner in which a circumferential array of air guide cylinder fins and a spiral are combined when a housing of a flue gas guide device according to an embodiment of the present invention is made of a heat-resistant alloy material.

Fig. 9 is a right-side structural diagram of the multi-stage preheating dual-mode low NOx self-preheating burner according to the embodiment of the present invention when the housing of the flue gas guiding device is made of the heat-resistant alloy material.

Fig. 10 is a schematic perspective view of a tile according to an embodiment of the present invention.

Fig. 11 is a schematic perspective view of a tile according to an embodiment of the present invention.

Fig. 12 is a schematic perspective view of a burner core according to an embodiment of the present invention.

Fig. 13 is a schematic perspective view of a burner core according to an embodiment of the present invention.

In the figure: a burner shell 1, an air flue gas flow guider 2, a heat exchanger 3, an air flow guide cylinder 4, a flue gas flow guider 5, a burner end cover 6, a burner core 7, a flower brick 8, an air cylinder 9, a smoke exhaust pipe 10,

An inner cavity 11 of the burner shell,

An outer cavity 21 of the air smoke deflector, an inner cavity 22 of the air smoke deflector,

A heat exchanger fin 31, a ring sleeve 32,

An air guide cylinder fin 41,

A smoke guide cavity 51,

A gas interface 60, a primary gas pipe 61, a secondary gas pipe 62, an ignition device 63, a flame monitoring device 64,

A central hole 70, a primary air hole 71, a secondary air duct 72, a boss 73, a splitter 74, a baffle 75, a refractory material protective layer 76,

A combustion chamber 80, an air channel 81, a flue gas channel 82, a combustion chamber outlet 801, a combustion chamber inlet 802,

An air inlet 90, an air cylinder cavity 91,

A smoke exhaust pipe fin 101, a smoke outlet channel 102 and a smoke outlet 103.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Examples are given.

Referring to fig. 1 to 13, it should be understood that the structures, ratios, sizes, etc. shown in the drawings attached to the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essence, and any modification of the structures, changes of the ratio relationship, or adjustment of the sizes should still fall within the scope that the technical contents disclosed in the present invention can cover without affecting the efficacy and the achievable purpose of the present invention. Meanwhile, in the present specification, if there are terms such as "upper", "lower", "left", "right", "middle" and "one", they are used for clarity of description only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are considered as the scope of the present invention without substantial changes in the technical content.

The multi-stage preheating dual-mode low-NOx self-preheating burner comprises a burner shell 1, an air and flue gas flow guider 2, a heat exchanger 3, an air guide cylinder 4, a flue gas guide device 5, a burner end cover 6, a burner core 7, a brick pattern 8, an air cylinder 9 and a smoke exhaust pipe 10, wherein the heat exchanger 3 is installed in the air and flue gas flow guider 2, and the air guide cylinder 4 is installed in the heat exchanger 3; an air final-stage preheating channel is formed between the outer wall of the air guide cylinder 4 and the inner wall of the heat exchanger 3.

In the embodiment, a burner shell 1 is installed at one end of a flue gas diversion device 5, a tile 8 is installed at the other end of the flue gas diversion device 5, a burner core 7 is connected with an inlet end of the tile 8, an outlet end of the tile 8 is a heated space, an air flue gas diversion device 2 is installed in the burner shell 1, the air flue gas diversion device 2 is matched with the flue gas diversion device 5, one end of a heat exchanger 3 is installed on the air flue gas diversion device 2, the other end of the heat exchanger 3 is connected with an inlet end of the tile 8, one end of an air diversion cylinder 4 is installed on the burner shell 1, the other end of the air diversion cylinder 4 is located in the heat exchanger 3, a burner end cover 6 and one end of an air cylinder 9 are both installed on the burner shell 1, a smoke exhaust pipe 10 is installed in the air cylinder.

An air flue gas deflector outer cavity 21 is arranged outside the air flue gas deflector 2 in the embodiment, an air flue gas deflector inner cavity 22 is arranged inside the air flue gas deflector 2, the air flue gas deflector outer cavity 21 is communicated with the air flue gas deflector inner cavity 22, a burner shell inner cavity 11 is arranged inside the burner shell 1, an air barrel inner cavity 91 is arranged on the outer wall of the smoke exhaust pipe 10 and the inner wall of the air barrel 9, the air barrel inner cavity 91 is communicated with the burner shell inner cavity 11, and one end of the smoke exhaust pipe 10 is communicated with the air flue gas deflector outer cavity 21; the outer cavity 21 of the air flue gas deflector is a secondary flue gas heat exchange channel, and an air secondary preheating channel is formed between the outer wall of the air flue gas deflector 2 and the inner wall of the burner shell 1.

In the embodiment, the other end of the smoke exhaust pipe 10 is a smoke outlet 103, the smoke exhaust pipe 10 is internally provided with a smoke outlet channel 102, the outer wall of the smoke exhaust pipe 10 is provided with smoke exhaust pipe fins 101, the smoke exhaust pipe fins 101 are positioned in an inner cavity 91 of the air cylinder, the air cylinder 9 is provided with an air inlet 90, and the air inlet 90 is communicated with the inner cavity 91 of the air cylinder; the exhaust pipe fins 101 are arranged in a spiral structure, and the exhaust pipe fins 101 divide the inner cavity 91 of the air cylinder into primary air preheating channels.

In the embodiment, the housing of the flue gas guiding device 5 is made of metal material, and a refractory material is arranged in the housing; or the shell of the flue gas guiding device 5 is made of heat-resistant alloy material and is connected with the burner shell 1 through a flange; a flue gas diversion cavity 51 is arranged in the flue gas diversion device 5, the flue gas diversion cavity 51 is communicated with the inner cavity 22 of the air flue gas diversion device, the other end of the heat exchanger 3 is positioned in the flue gas diversion cavity 51, and the burner core 7 and the brick pattern 8 are both positioned in the flue gas diversion cavity 51 and are both matched with the other end of the heat exchanger 3.

The outer wall of the air guide cylinder 4 in the embodiment is provided with an air guide cylinder fin 41; the air guide cylinder fins 41 are arranged in a circumferential array; or the air guide cylinder fins 41 are arranged spirally; or the fins 41 of the air guide cylinder are arranged in a circumferential array and spiral combination way; or the air guide cylinder fins 41 are arranged in a step shape, and when the air guide cylinder fins 41 are arranged in a step shape, the horizontal parts of the air guide cylinder fins 41 and the air guide cylinder 4 are provided with sieve mesh-shaped structures.

The heat exchanger 3 in the embodiment is arranged in a cylindrical structure, the outer wall of the heat exchanger 3 is provided with heat exchanger fins 31, the other end of the heat exchanger 3 is provided with a ring sleeve 32, and the ring sleeve 32 is in contact fit with the flower bricks 8; a primary flue gas heat exchange channel is formed between the outer wall of the heat exchanger 3 and the inner cavity 22 of the air flue gas deflector and the flue gas deflector cavity 51.

In the embodiment, a baffle 75 is installed at one end of a burner core 7, a refractory material protective layer 76 is arranged at the other end of the burner core 7, the end of the burner core is matched with a brick 8, a boss 73 is installed on the baffle 75, a central hole 70 is arranged on the boss 73, a plurality of primary air holes 71 are arranged in the circumferential direction of the boss 73, the plurality of primary air holes 71 are all arranged on the baffle 75, the number of the primary air holes 71 is m, the value range of m is 4-12, one end of each primary air hole 71 is communicated with an inner cavity of a heat exchanger 3, the other end of each primary air hole 71 is communicated with a combustion cavity 80, a plurality of splitter plates 74 are arranged on the outer wall of the burner core 7, the plurality of splitter plates 74 are arranged in a circumferential array along the axis of the burner core 7, a secondary air duct 72 is arranged between two adjacent splitter plates 74, the number of the secondary air ducts 72 is n, the value range of n is 3-24, one end of, the other end of the secondary air duct 72 communicates with the combustion chamber 80.

The brick 8 in this embodiment is provided with a combustion chamber 80, the combustion chamber 80 is arranged in a bell mouth-shaped structure, a plurality of air channels 81 are arranged in the circumferential direction of the combustion chamber 80, the number of the air channels 81 is x, the value range of x is 4-16, the air channels 81 are arranged in an inclined manner, the included angle between the axis of the air channels 81 and the axis of the combustion chamber 80 is alpha, the value range of alpha is 0-20 degrees, the outer wall of the brick 8 is provided with a plurality of flue gas channels 82, the flue gas channels 82 are arranged in a fan-shaped structure, the number of the flue gas channels 82 is y, and the value range of y is 4-12; the two ends of the combustion chamber 80 are a combustion chamber outlet 801 and a combustion chamber inlet 802, respectively.

A primary gas pipe 61 is arranged on the burner end cover 6 in the embodiment, a secondary gas pipe 62 is arranged in the primary gas pipe 61, one end of the primary gas pipe 61 is communicated with a gas interface 60 on the burner end cover 6, one end of the secondary gas pipe 62 is exposed out of the burner end cover 6, the other end of the primary gas pipe 61 is connected with the burner core 7, the other end of the secondary gas pipe 62 is penetrated through the burner core 7 and is positioned in the brick 8, an ignition device 63 is arranged on the burner end cover 6, one end of the ignition device 63 is exposed out of the burner end cover 6, and the other end of the ignition device 63 is connected with the burner core 7; the primary gas pipe 61 and the ignition device 63 are both positioned in the air guide cylinder 4, and the burner end cover 6 is provided with a flame monitoring device 64.

Specifically, external air enters an air primary preheating channel between the air cylinder 9 and the smoke exhaust pipe 10 through an air inlet 90, and exchanges heat with the smoke exhaust pipe 10 to perform primary preheating on the air; then enters a secondary air preheating channel formed between the burner shell 1 and the air flue gas fluid director 2, and exchanges heat with the air flue gas fluid director 2 to perform secondary preheating on air; the preheated air enters the air final preheating channel between the air guide cylinder 4 and the heat exchanger 3, and exchanges heat with the heat exchanger 3 to finally preheat the air, one part of the finally preheated air enters the combustion cavity 80 through the burner core 7 and is mixed and combusted with the fuel gas entering the combustion cavity 80 through the burner core 7, and the other part of the finally preheated air enters the heating space through the air channel 81 and is mixed and combusted with the unburned fuel gas sprayed out of the combustion cavity 80.

External gas enters the burner end cover 6 from the gas interface 60, enters the combustion chamber 80 through the primary gas pipe 61 and the burner core 7 to be mixed with gas in the combustion chamber 80, and incompletely combusted mixture is ejected out of the combustion chamber outlet 801 to enter a heating space and enters the heating space through the air channel 81 to be mixed and combusted again.

The flue gas in the heating space enters a primary flue gas heat exchange channel formed between the heat exchanger 3 and the flue gas diversion cavity 51 and the inner cavity of the air flue gas diversion device 2 through the flue gas channel 82, enters the inner cavity 22 of the air flue gas diversion device 2 and the outer cavity 21 of the air flue gas diversion device after heat exchange with the heat exchanger 3, is discharged to an external smoke discharge system through the smoke discharge pipe 10 after heat exchange is carried out on the flue gas again, and finally carries out heat exchange with the smoke discharge pipe 10.

Alternatively, the external gas may be directly introduced into the combustion chamber 80 through the secondary gas pipe 62, and the high-speed gas may be mixed with the air in the combustion chamber 80 and the air injected from the air passage 81 to form a diffusion combustion mode. Which is controlled by an external gas valve.

The multi-stage preheating double-mode low-NOx self-preheating burner has the advantages that:

1. the air cylinder 9 is sleeved outside the smoke exhaust pipe 10, the air subjected to primary heat exchange is outside the smoke exhaust pipe 10, and the high-temperature smoke is in the smoke exhaust pipe 10, so that the temperature of the outer wall of the air cylinder 9 is low, the air passes through a spiral channel, and the heat exchange path is lengthened; the primary preheating of the air enters the burner shell 1 and the air flue gas flow guider 2 for secondary heat exchange, and finally enters the heat exchanger 3 and the air flue gas flow guider 2 for final heat exchange, so that the heat exchange path, the heat exchange area and the heat exchange efficiency are greatly improved, the air preheating temperature is improved, the combustion efficiency is increased, and the heat efficiency and the energy utilization rate are improved.

2. When primary and secondary air is preheated, the air circulation channel is arranged outside the air flue gas fluid director 2, and the flue gas circulation channel is arranged in the air flue gas fluid director 2, so that the flue gas circulation resistance is reduced, the smoke discharge is smoother, the temperature of the outer wall of the burner is greatly reduced, the service life of the burner is prolonged, the working environment of the burner is improved, and the burner is more friendly to use and operate.

3. The fins are arranged on the outer wall of the air guide cylinder 4, and the circumferential array, the spiral, the combination of the spiral and the circumferential array and the step shape in various structural forms are adopted, so that the heat exchange efficiency and the service performance of the burner can be optimized according to different use working conditions and use occasions and flexible selection.

4. The preheated air can enter the combustion cavity 80 through the burner core 7 for one time and two times to be mixed with the primary fuel gas, and the tertiary air directly enters the heating space through the air channel 81 to be mixed and combusted with the mixed air and fuel gas sprayed out of the combustion cavity 80, so that the multistage mixing is really realized, and the generation of NOx is reduced to the maximum extent. Or the preheated air and the secondary fuel gas are sprayed into the heating space to form diffusion combustion, and the generation of ultra-low NOx is realized.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a multistage preheating double mode low NOx self preheats nozzle, includes nozzle shell (1), air flue gas divertor (2), heat exchanger (3), air draft tube (4), flue gas guiding device (5), nozzle end cover (6), nozzle core (7), brick flower (8), air section of thick bamboo (9) and tub (10) of discharging fume, its characterized in that: the burner is characterized in that one end of a flue gas diversion device (5) is installed at the burner shell (1), the other end of the flue gas diversion device (5) is installed at the brick (8), a burner core (7) is installed on the brick (8), an air flue gas deflector (2) is installed in the burner shell (1), the air flue gas deflector (2) is matched with the flue gas diversion device (5), one end of a heat exchanger (3) is installed on the air flue gas deflector (2), the other end of the heat exchanger (3) is connected with the inlet end of the brick (8), one end of an air diversion cylinder (4) is installed on the burner shell (1), the other end of the air diversion cylinder (4) is located in the heat exchanger (3), one ends of a burner end cover (6) and an air cylinder (9) are both installed on the burner shell (1), and a smoke exhaust pipe (10) is installed in the air cylinder (9), the smoke exhaust pipe (10) is connected with the air and smoke deflector (2).

2. The multi-stage preheat dual mode low NOx self-preheat burner of claim 1, wherein: the burner core (7) is connected with the inlet end of the brick pattern (8), the heat exchanger (3) is arranged in the air flue gas flow guider (2), and the air flow guiding cylinder (4) is arranged in the heat exchanger (3); and/or; an air final-stage preheating channel is formed between the outer wall of the air guide cylinder (4) and the inner wall of the heat exchanger (3).

3. The multi-stage preheat dual mode low NOx self-preheat burner of claim 1, wherein: an air flue gas deflector outer cavity (21) is arranged outside the air flue gas deflector (2), an air flue gas deflector inner cavity (22) is arranged inside the air flue gas deflector (2), the air flue gas deflector outer cavity (21) is communicated with the air flue gas deflector inner cavity (22), a burner shell inner cavity (11) is arranged inside the burner shell (1), an air barrel inner cavity (91) is arranged between the outer wall of the smoke exhaust pipe (10) and the inner wall of the air barrel (9), the air barrel inner cavity (91) is communicated with the burner shell inner cavity (11), and one end of the smoke exhaust pipe (10) is communicated with the air flue gas deflector outer cavity (21); and/or; the outer cavity (21) of the air flue gas flow guider is a secondary flue gas heat exchange channel, and an air secondary preheating channel is formed between the outer wall of the air flue gas flow guider (2) and the inner wall of the burner shell (1).

4. The multi-stage pre-heat dual-mode low NOx self-preheating burner of claim 3, wherein: the other end of the smoke exhaust pipe (10) is a smoke outlet (103), a smoke outlet channel (102) is arranged inside the smoke exhaust pipe (10), smoke exhaust pipe fins (101) are installed on the outer wall of the smoke exhaust pipe (10), the smoke exhaust pipe fins (101) are located in an air cylinder inner cavity (91), an air inlet (90) is formed in the air cylinder (9), and the air inlet (90) is communicated with the air cylinder inner cavity (91); and/or; the smoke exhaust pipe fins (101) are arranged in a spiral structure, and the inner cavity (91) of the air cylinder is divided into primary air preheating channels by the smoke exhaust pipe fins (101).

5. The multi-stage preheat dual mode low NOx self-preheat burner of claim 1, wherein: the shell of the flue gas flow guide device (5) is made of a metal material, and a refractory material is arranged in the shell; or the shell of the flue gas guide device (5) is made of a heat-resistant alloy material, and the shell is connected with the burner shell (1) through a flange; and/or; be provided with flue gas water conservancy diversion chamber (51) in flue gas guiding device (5), flue gas water conservancy diversion chamber (51) and air flue gas divertor inner chamber (22) intercommunication, the other end of heat exchanger (3) is located flue gas water conservancy diversion chamber (51), burner core (7) and brick flower (8) all are located flue gas water conservancy diversion chamber (51), and all cooperate with the other end of heat exchanger (3).

6. The multi-stage preheat dual mode low NOx self-preheat burner of claim 1, wherein: an air guide cylinder fin (41) is arranged on the outer wall of the air guide cylinder (4); the air guide cylinder fins (41) are arranged in a circumferential array; or the air guide cylinder fins (41) are arranged spirally; or the air guide cylinder fins (41) are combined in a circumferential array shape and a spiral shape; or the air guide cylinder fins (41) are arranged in a step shape, and when the air guide cylinder fins (41) are arranged in the step shape, sieve mesh-shaped structures are arranged at the horizontal positions of the air guide cylinder fins (41) and the air guide cylinder (4).

7. The multi-stage preheat dual mode low NOx self-preheat burner of claim 1, wherein: the heat exchanger (3) is arranged in a cylindrical structure, heat exchanger fins (31) are arranged on the outer wall of the heat exchanger (3), a ring sleeve (32) is arranged at the other end of the heat exchanger (3), and the ring sleeve (32) is in contact fit with the flower bricks (8); and/or; a primary flue gas heat exchange channel is formed between the outer wall of the heat exchanger (3) and the inner cavity (22) of the air flue gas flow guider and the flue gas flow guiding cavity (51).

8. The multi-stage preheat dual mode low NOx self-preheat burner of claim 1, wherein: the burner is characterized in that a baffle (75) is installed at one end of the burner core (7), a refractory material protective layer (76) is arranged at the other end of the burner core (7), the other end of the burner core (7) is matched with a brick pattern (8), a boss (73) is installed on the baffle (75), a central hole (70) is formed in the boss (73), a plurality of primary air holes (71) are formed in the circumferential direction of the boss (73), the primary air holes (71) are all arranged on the baffle (75), the number of the primary air holes (71) is m, the value range of m is 4-12, one end of each primary air hole (71) is communicated with an inner cavity of the heat exchanger (3), the other end of each primary air hole (71) is communicated with a combustion cavity (80), a plurality of splitter vanes (74) are arranged on the outer wall of the burner core (7), and the splitter vanes (74) are arranged in a circumferential array along the axis of the burner core (7), a secondary air duct (72) is arranged between two adjacent splitter plates (74), the number of the secondary air ducts (72) is n, the value range of n is 3-24, one end of each secondary air duct (72) is communicated with the inner cavity of the heat exchanger (3), and the other end of each secondary air duct (72) is communicated with the combustion cavity (80).

9. The multi-stage preheat dual mode low NOx self-preheat burner of claim 1, wherein: the brick for the flower decoration is characterized in that a combustion chamber (80) is arranged on the brick for the flower decoration (8), the combustion chamber (80) is arranged in a horn mouth-shaped structure, a plurality of air channels (81) are arranged in the circumferential direction of the combustion chamber (80), the number of the air channels (81) is x, the value range of x is 4-16, the air channels (81) are arranged in an inclined manner, the included angle between the axis of the air channels (81) and the axis of the combustion chamber (80) is alpha, the value range of alpha is 0-20 degrees, a plurality of flue gas channels (82) are arranged on the outer wall of the brick for the flower decoration (8), the number of the flue gas channels (82) is y, and the value range of y is 4-12; and/or; and the two ends of the combustion cavity (80) are respectively a combustion cavity outlet (801) and a combustion cavity inlet (802).

10. The multi-stage preheat dual mode low NOx self-preheat burner of claim 1, wherein: be provided with one-level gas pipe (61) on burner end cover (6), install second grade gas pipe (62) in one-level gas pipe (61), the one end of one-level gas pipe (61) communicates with each other with gas interface (60) on burner end cover (6), the one end of second grade gas pipe (62) is exposed in burner end cover (6), the other end and the burner core (7) of one-level gas pipe (61) are connected, the other end and the burner core (7) of second grade gas pipe (62) run through, and be located brick (8), install ignition (63) on burner end cover (6), the one end of ignition (63) is exposed in burner end cover (6), the other end and the burner core (7) of ignition (63) are connected, install flame monitoring device (64) on burner end cover (6).