CN215062054U

CN215062054U - Short and thick flame low-nitrogen gas combustion device

Info

Publication number: CN215062054U
Application number: CN202120597379.4U
Authority: CN
Inventors: 路卉
Original assignee: Individual
Current assignee: Hangzhou Shuangneng Energy Saving Technology Co ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-12-07
Anticipated expiration: 2031-03-24

Abstract

A short and thick flame low-nitrogen gas combustion device is characterized by comprising an air supply system, an air supply system and a program controller which are connected; the air supply system comprises a fan and a volute which are connected, the air supply system comprises a gas inlet pipeline, a gas valve assembly and a combustion head which are connected, and the combustion head is arranged in the middle of an air outlet of the volute; the air supply system and the air supply system are electrically connected with the program controller; compared with the prior art, the air required by combustion forms uniform and stable rotating air flow through the fan, the air door assembly and the volute, the gas enters the disk of the burner head along the gas inlet pipeline, the gas valve assembly and the gas valve and is sprayed out from the nozzle small holes fixed on the circumference of the disk, the gas is mixed with the rotating air flow at the air outlet of the volute, and after ignition and ignition, a short and thick rotational flow hollow flame is formed.

Description

Short and thick flame low-nitrogen gas combustion device

Technical Field

The utility model belongs to the technical field of the low nitrogen combustion of gas, especially, short thick flame low nitrogen gas burner.

Background

Nitrogen oxides are one of the main pollution sources causing air pollution, and the emission of the nitrogen oxides generated by boiler combustion needs to be strictly controlled so as to reduce the environmental pollution.

At present, the technical modes for reducing the emission of nitrogen oxides by controlling the combustion mode comprise flue gas external circulation, full-premixing surface combustion and the like.

The flue gas extrinsic cycle technique is that the low temperature flue gas of boiler afterbody flows back partly, mixes with the gas again and burns, so not only can reduce combustion temperature, has also reduced oxygen concentration moreover, and then has reduced NOx's emission concentration, but has several problems: 1. the stability is reduced: after FGR, the flame monitor is polluted to cause unstable operation of the burner; NOx emissions are not stable; 2. wheezing and abnormal sounds: the surge of the fan of the burner and the vibration increase of the boiler and the flue occur. 3. The problem of condensed water: after FGR flue gas reflows, the temperature is too low, and condensed water enters the combustor to cause the running failure of combustor equipment and the corrosion of the combustor, so that the service life of the combustor is short.

The full-premixing surface combustion mixes air and fuel gas in proportion in advance, sends the mixture into a metal fiber or ceramic fiber combustion device, and the flame burns on the surface of the flame, increases the amount of premixed air during combustion, can dilute the combustion gas by excessive air, reduces the combustion temperature, and then reduces the emission concentration of NOx, but has several problems: 1. flame stability is poor, and a tempering and deflagration phenomenon is easy to occur; 2. because the surface mesh of the combustor is fine, the combustor is easy to block when being used in a place with unclean ambient air; 3. in the case of low air excess coefficients, the nitrogen oxide emissions are higher. 4. After a period of use, the output power is reduced, and the cleaning and maintenance are required regularly.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome the defect among the above-mentioned prior art, provide a can effectively restrain the gas combustion device that heating power type nitrogen oxide generated among the combustion process.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a short and thick flame low-nitrogen gas combustion device is characterized by comprising an air supply system, an air supply system and a program controller which are connected; the air supply system comprises a fan and a volute which are connected, the air supply system comprises a gas inlet pipeline, a gas valve assembly and a combustion head which are connected, and the combustion head is arranged in the middle of an air outlet of the volute; the air supply system and the air supply system are electrically connected with the program controller.

As an optimized scheme of the utility model, the air feed system still includes fan converter, fan low pressure protection device, sky square ground circle, air door assembly and air door executor.

As the utility model discloses a preferred scheme, fan converter and fan low pressure protection device connect on the fan, and sky square ground circle and air door assembly are located the junction of fan and spiral case, and the air door executor is connected on the air door assembly.

As an optimized scheme of the utility model, the spiral case is a wind channel structure that the steel sheet welding encloses, comprises front panel, rear panel, left side board and right side board.

As a preferred scheme of the utility model, two or three guide plates are formed in the middle of the volute.

As an optimized proposal of the utility model, the front panel, the rear panel and the guide plate are of involute round structures.

As an optimized proposal of the utility model, the front panel is also connected with an ignition device and a flame monitoring device.

As an optimized scheme of the utility model, the gas valve subassembly is located the gas admission line, and the combustion head is connected in the gas admission line tip, and the gas valve subassembly is including the gas leakage protection device, gas low pressure protection device, gas valve and the gas valve executor that are connected.

As a preferred scheme of the utility model, the combustion head is the disc structure, including center tube, disc, nozzle and circular cone, the center tube passes the spiral case and links to each other with the disc, and the circular cone is connected on the disc, and center tube and circular cone are located the relative both sides of disc, and the nozzle sets up on the disc.

As an optimized scheme of the utility model, the disc is hollow cavity structures, and is formed with a plurality of nozzles on the disc, staggered and circumference around a plurality of nozzles distribute on the disc.

As a preferred scheme of the utility model, nozzle one end opening, one end is sealed, and the open end of nozzle inserts in the disc.

The beneficial effects of the utility model are that, compare with prior art: the air required by combustion forms uniform and stable rotating air flow through the fan, the air door assembly and the volute, the gas enters the disc of the burner head along the gas inlet pipeline, the gas valve assembly and the gas valve and is sprayed out from a plurality of nozzle small holes fixed on the circumference of the disc, the gas is mixed with the rotating air flow at the air outlet of the volute, a short and thick rotational flow hollow flame is formed after ignition and ignition, the peripheral temperature of the flame is high, the flame is full of the whole cylindrical hearth, the flame of the hearth pipe wall is concentrated in heat absorption capacity, the combustion temperature is low, the temperature field is uniform, the combustion is sufficient, the central temperature of the flame is low, the generation of thermal type nitrogen oxides in the combustion process can be effectively inhibited, and the low-nitrogen emission is realized.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a side view of the present invention;

FIG. 3 is a schematic structural view of a wind supply system;

FIG. 4 is a schematic view of the construction of the gas supply system;

reference numbers in the figures: the device comprises a fan 1, a fan frequency converter 2, a fan low-pressure protection device 3, a square and ground circle 4, an air door assembly 5, an air door actuator 6, a volute 7, a gas inlet pipeline 8, a gas valve component 9, a gas leakage protection device 10, a gas low-pressure protection device 11, a gas valve 12, a gas valve actuator 13, a combustion head 14, an ignition device 15, a flame monitoring device 16, a program controller 17, a front panel 18, a rear panel 19, a left side panel 20, a right side panel 21, a guide plate 22, a central tube 23, a disc 24, a nozzle 25 and a cone frustum 26.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the accompanying drawings.

As shown in fig. 1-4, a short and thick flame low-nitrogen gas combustion device comprises an air supply system, an air supply system and a program controller 17 which are connected; the air supply system comprises a fan 1 and a volute 7 which are connected, the air supply system comprises a gas inlet pipeline 8, a gas valve assembly 9 and a combustion head 14 which are connected, and the combustion head 14 is arranged in the middle of an air outlet of the volute 7; the air supply system and the air supply system are electrically connected with the program controller 17.

The program controller 17 controls the start and stop of the air supply system and the air supply system.

The air supply system also comprises a fan frequency converter 2, a fan low-voltage protection device 3, a square top and a ground circle 4, an air door assembly 5 and an air door actuator 6.

The fan frequency converter 2 and the fan low-voltage protection device 3 are connected to the fan 1, the sky-ground circle 4 and the air door assembly 5 are located at the connection position of the fan 1 and the volute 7, and the air door actuator 6 is connected to the air door assembly 5.

The volute casing 7 is an air channel structure formed by welding and enclosing steel plates and comprises a front plate 18, a rear plate 19, a left side plate 20 and a right side plate 21, two or three guide plates 22 are formed in the middle of the volute casing 7, the volute casing 7 is divided into a plurality of air inlet channels under the action of the guide plates 22, the front plate 18, the rear plate 19 and the guide plates 22 are of involute circle structures, under the action of involute circles, air enters the volute casing 7 to form uniform and stable rotating air flow, and the front plate 18 is further connected with an ignition device 15 and a flame monitoring device 16.

The gas valve assembly 9 is located on the gas inlet pipe 8, the combustion head 14 is connected to the end of the gas inlet pipe 8, the gas valve assembly 9 comprises a gas leakage protection device 10, a gas low-pressure protection device 11, a gas valve 12 and a gas valve actuator 13 which are connected, the gas valve actuator 13 is connected with the gas valve 12, the gas valve actuator 13 controls the gas valve 12 to be opened and closed, and the gas leakage protection device 10 and the gas low-pressure protection device 11 are used for detecting the gas pressure in the gas inlet pipe 8 and sending out an alarm signal.

The combustion head 14 is of a disc structure and comprises a central pipe 23, a disc 24, a nozzle 25 and a cone frustum 26, wherein the central pipe 23 penetrates through the volute 7 to be connected with the disc 24, the cone frustum 26 is connected to the disc 24, the central pipe 23 and the cone frustum 26 are located on two opposite sides of the disc 24, and the nozzle 25 is arranged on the disc 24.

The disc 24 is a hollow cavity structure, a plurality of through holes corresponding to the nozzles 25 are formed on the circumference of the disc 24, the through holes are staggered back and forth and circumferentially distributed, a plurality of nozzles 25 are formed on the disc 24, the nozzles 25 are staggered back and forth and circumferentially distributed on the disc 24, a hollow cylinder with a plurality of small holes is axially formed in each nozzle 25, one end of each nozzle 25 is open, the other end of each nozzle 25 is closed, the open end of each nozzle 25 is inserted into the disc 24, and the truncated cone 26 has a certain height.

In the actual use process, the air required by combustion forms uniform and stable rotating air flow through the fan 1, the air door assembly 5 and the volute 7, the gas enters the disc 24 of the combustion head 14 along the gas inlet pipeline 8, the gas valve assembly 9 and the gas valve 12 and then is sprayed out from the small holes of the plurality of nozzles 25 fixed on the circumference of the disc, the gas is mixed with the rotating air flow at the middle part of the outlet of the volute 7, a short and thick swirl flame is formed after ignition and ignition, the peripheral temperature of the flame is high, the flame fills the whole cylindrical hearth, and the flame concentration heat absorption capacity of the wall of the hearth is large.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Although the reference numerals in the figures are used more here: the technical scheme includes that the technical scheme includes terms such as a fan 1, a fan frequency converter 2, a fan low-pressure protection device 3, a sky and earth circle 4, a damper assembly 5, a damper actuator 6, a volute 7, a gas inlet pipeline 8, a gas valve assembly 9, a gas leakage protection device 10, a gas low-pressure protection device 11, a gas valve 12, a gas valve actuator 13, a combustion head 14, an ignition device 15, a flame monitoring device 16, a program controller 17, a front panel 18, a rear panel 19, a left side panel 20, a right side panel 21, a guide plate 22, a central tube 23, a disc 24, a nozzle 25 and a cone frustum 26, but the possibility of using other terms is not excluded; these terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. A short and thick flame low-nitrogen gas combustion device is characterized by comprising an air supply system, an air supply system and a program controller (17) which are connected with each other; the air supply system comprises a fan (1) and a volute (7) which are connected, the air supply system comprises a gas inlet pipeline (8), a gas valve assembly (9) and a combustion head (14) which are connected, and the combustion head (14) is arranged in the middle of an air outlet of the volute (7); the air supply system and the air supply system are electrically connected with the program controller (17).

2. The short and thick flame low-nitrogen gas combustion device as claimed in claim 1, wherein the air supply system further comprises a fan frequency converter (2), a fan low-pressure protection device (3), a sky and earth circle (4), a damper assembly (5) and a damper actuator (6).

3. The short and thick flame low-nitrogen gas combustion device as claimed in claim 2, wherein the fan frequency converter (2) and the fan low-pressure protection device (3) are connected to the fan (1), the heaven and earth circle (4) and the air door assembly (5) are located at the joint of the fan (1) and the volute (7), and the air door actuator (6) is connected to the air door assembly (5).

4. The short and thick flame low-nitrogen gas combustion device as claimed in claim 1, wherein the volute (7) is an air duct structure formed by welding steel plates, and is composed of a front panel (18), a rear panel (19), a left side plate (20) and a right side plate (21), and the front panel (18) is further connected with an ignition device (15) and a flame monitoring device (16).

5. The stubby flame low-nitrogen gas combustion device as claimed in claim 4, wherein the middle of the volute (7) is formed with two or three baffles (22).

6. A stubby flame low-nitrogen gas combustion device according to claim 5, characterized in that the front panel (18), the rear panel (19) and the deflector (22) are of involute circle structure.

7. The stubby flame low-nitrogen gas combustion device as claimed in claim 1, wherein the gas valve assembly (9) is located on the gas inlet pipe (8), the combustion head (14) is connected to the end of the gas inlet pipe (8), and the gas valve assembly (9) comprises a gas leakage protection device (10), a gas low-pressure protection device (11), a gas valve (12) and a gas valve actuator (13) which are connected.

8. A short and coarse flame low-nitrogen gas combustion device as claimed in claim 7, wherein the combustion head (14) is of a disc structure and comprises a central tube (23), a disc (24), a nozzle (25) and a truncated cone (26), the central tube (23) passes through the volute (7) and is connected with the disc (24), the truncated cone (26) is connected with the disc (24), the central tube (23) and the truncated cone (26) are positioned at two opposite sides of the disc (24), and the nozzle (25) is arranged on the disc (24).

9. The short and thick flame low-nitrogen gas combustion device as claimed in claim 8, wherein the disc (24) is a hollow cavity structure, and a plurality of nozzles (25) are formed on the disc (24), and the plurality of nozzles (25) are staggered back and forth and circumferentially distributed on the disc (24).

10. A stubby flame low-nitrogen gas combustion device as claimed in claim 9, wherein the nozzle (25) is open at one end and closed at the other end, and the open end of the nozzle (25) is inserted into the disc (24).