CN217737191U - Multi-level multi-flame low-nitrogen gas burner - Google Patents

Abstract

The utility model relates to a low nitrogen gas burner of multi-level many flames, including the fan subassembly, the combustor control box, the combustor casing, flame tube assembly and back shroud, flame tube assembly includes the flame tube urceolus, central ever-burning flame swirler subassembly, the gas distributor, flame tube inner tube and manual control secondary air door section of thick bamboo, the flame tube urceolus passes through flange and combustor casing connection, central ever-burning flame swirler subassembly sets up the center department in the flame tube urceolus, its front end cover is equipped with a central section of thick bamboo, the front end of manual control secondary air door section of thick bamboo covers the rear end of a central section of thick bamboo, the front end at a central section of thick bamboo is established to flame tube inner tube cover, the gas distributor includes the gas distribution ring, on the gas distribution ring equidistance be equipped with multiunit gas nozzle to the front end of flame inner tube extends, encircle the outside of flame tube inner tube. Has the advantages that: the unique design of the flame tube assembly enables air and fuel to enter a combustion zone of a hearth through 4 layers respectively for full combustion, and the generation of NOx is reduced.

Description

Multi-level multi-flame low-nitrogen gas burner

Technical Field

The utility model relates to a combustor technical field, in particular to low nitrogen gas burner of multi-level many flames.

Background

With the rapid development of society, people can be analogized to the turning period from the industrial civilization age to the ecological civilization age. Low-carbon economy is advocated vigorously, and ecological civilization is built. China faces double tasks of industrialization and ecology, and the contradiction between energy demand and environmental pollution is more and more prominent. The new flue gas emission standard reduces the emission of smoke concentration, CO, NOX and SO2, such as local standards of Beijing, hebei and the like, and the NOX emission of the tail gas of the boiler is required to be less than 30mg/Nm & lt 3 > for example, in Shanghai, jiangsu, zhejiang and other local standards, the emission of NOx in the tail gas of a boiler is required to be less than 50mg/Nm3, in order to meet the NOx emission index requirements of different areas, the existing burner is usually realized by adopting a combustion mode of flue gas external circulation, grading and segmentation and the like, and the combustion mode inevitably loses the thermal efficiency of part of the boiler, increases the gas consumption and increases the production and processing cost. At present, in the domestic and foreign burner industry, the diffusion type combustion is adopted as the combustion mode, and in order to ensure the sufficient combustion of the fuel, the design idea of better mixing of the fuel and air is generally adopted. As the temperature increases, the amount of thermal NOx produced increases geometrically by a multiple. In order to solve the problem of reducing the NOx emission of the combustor, meet the national and local standards, ensure the sufficient combustion of fuel and ensure the little change of the thermal efficiency of the boiler, the combustor is a problem which needs to be solved urgently by global technicians.

SUMMERY OF THE UTILITY MODEL

The utility model provides a solve above-mentioned technical problem, specifically provide a low nitrogen gas burner of multi-level many flames with 4 levels.

The technical scheme is that the multi-layer multi-flame low-nitrogen gas burner comprises a fan component, a burner control box, a burner shell, a flame tube assembly and a rear cover plate, wherein the burner control box is arranged above the fan component through a supporting tripod, the burner shell is communicated with an air outlet of the fan component, the flame tube assembly is installed on one side of the front end of the burner shell, the rear cover plate covers the other side of the front end of the burner shell, an air inlet pipeline is communicated with the lower end of the rear side of the flame tube assembly, the burner is characterized in that the flame tube assembly comprises a flame tube outer tube, a central open flame swirler component, a gas distributor, a flame tube inner tube and a manual control secondary air door tube, the flame tube outer tube is connected with the burner shell through a flange, the central open flame swirler component is arranged at the center in the flame tube outer tube, a central tube is arranged at the front end cover of the flame tube inner tube, the central tube extends forwards to the outside the front end of the flame tube outer tube, so that air and fuel are fully combusted, a plurality of groups of air distribution rings are arranged outside the flame tube inner tube, and a plurality of the front end of the flame tube inner tube is fully covered with a plurality of the flame distribution ring, so that the flame distribution ring is formed, and a plurality of the front end of the flame tube is arranged on the front end of the flame tube, so that the flame tube inner tube is fully combusted.

As a further improvement, the central open fire swirler assembly comprises a central air inlet pipe, premixing nozzles, bypass ignition needle assemblies and swirlers, the rear end of the central air inlet pipe is communicated with the air inlet pipeline through a central air metal connecting hose and a central gas butterfly valve assembly, the swirlers are mounted at the front end of the central air inlet pipe, the four premixing nozzles are arranged in groups around the front section of the central air inlet pipe and are communicated with the inside of the central air inlet pipe, two groups are arranged, and the bypass ignition needle assemblies are fixed on the swirlers.

As a further improvement, the cyclone comprises an inner ring disc and an outer ring disc, a plurality of cyclone blades are arranged between the inner ring disc and the outer ring disc at equal intervals, the included angle between each cyclone blade and the horizontal plane is 35 degrees, the cyclone strength of the cyclone is 0.7-1.4, and the axial component velocity of the cyclone is 8-22 m/s.

As a further improvement, the rear end of the manual control secondary air door cylinder is provided with an upper air door plate and a lower air door plate, the upper air door plate and the lower air door plate are used for manually controlling the opening and closing of the manual control secondary air door cylinder by connecting two pull rods, the pull rods extend from the rear cover plate to the inside of the flame tube outer cylinder, and the front end and the rear end of the manual control air door cylinder are both in a closed shape.

As a further improvement, the tube opening of the inner tube of the flame tube is open.

As a further improvement, the gas nozzles have three groups, the first group is main gas nozzle, the second group is first auxiliary gas nozzle, the third group is second auxiliary gas nozzle, one inside one of the nozzle of main gas nozzle outwards staggered arrangement, the nozzle of first auxiliary gas nozzle all faces to the inner tube of flame tube sets up, the nozzle of second auxiliary gas nozzle sets up forward.

As a further improvement, an air door assembly is installed at the joint of the combustor shell and the air outlet of the fan assembly, the air door assembly drives the air door to be opened and closed by connecting a first servo motor, a flow regulating valve is installed on the air inlet pipeline, the flow regulating valve drives the flow regulating valve to be opened and closed by connecting a second servo motor, the fan of the fan assembly drives the fan to be opened and closed by connecting a third servo motor, and the first servo motor, the second servo motor and the third servo motor are all connected with a controller in the combustor control box.

Advantageous effects

The beneficial effects are that: 1. the unique design of the graded air and the graded fuel is adopted, the unique design of the flame tube assembly enables the air and the fuel to enter a combustion area of a hearth through 4 layers respectively for full combustion, a low-pressure backflow area is formed in the root part of the combustion area, and the entrainment part of flue gas enters flame for direct secondary combustion, so that the problem of condensed water is avoided; on the basis of staged combustion, the combined high-speed jet combustion technology and the unique smoke FIR internal circulation and AFR self-circulation design are adopted, so that ultralow-nitrogen combustion is realized, the combustion rate is reduced, the reaction generation rate of the NOx in the fast reaction and the NOx in the thermal reaction is controlled, the temperature of the combustion flame at the center is reduced, and the generation of the NOx is reduced.

2. The combustor is designed by mixing gas and flue gas combustor structure by using high-speed self-jet effect of gas, a swirl plate is uniquely designed at the center to adjust the gas flow direction, and open flame structure at the center is controlled to improve the combustion stability; the central flame also adopts partial premixing: the fuel and the air are partially mixed before combustion, so that the combustion intensity is increased, and the flame stability is enhanced; under the structural design of dual stability, the long-time open flame combustion flame can still be stably combusted under the condition of excessive oxygen, the stable operation and the safe combustion of the peroxide lean fuel are realized, the NOx generation rate of the combustion fast reaction is effectively controlled, and the generation of NOx is reduced.

3. The air and fuel regulation proportion is accurately controlled through an independent servo motor, so that the temperature distribution of a fire scene in a combustion chamber is well controlled, the local high temperature at the center is avoided, the generation rate of NOx in combustion fast reaction is effectively inhibited, the method is one of the methods for most directly and effectively reducing NOx emission, and meanwhile, the output control of a good boiler can be fully ensured, and the normal installation and operation of a combustor in a full proportion range are ensured.

4. The structure of the device is convenient to disassemble, assemble and maintain daily, and the debugging operation is safe and reliable.

Drawings

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

FIG. 1 is a schematic view of the three-dimensional structure of the present invention;

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

FIG. 3 is a rear view of the burner housing and liner assembly of the present invention;

FIG. 4 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic view of the structure of the flame tube assembly and the damper assembly of the present invention;

fig. 6 is a front view of the burner housing and liner assembly of the present invention;

fig. 7 is a schematic structural view of the center pilot fire swirler assembly of the present invention.

Reference numbers in the figures:

1. fan assembly 2, combustor control box 3 and combustor shell

4. The burner inner barrel assembly 401, the burner inner barrel 402, the central long open fire swirler assembly 4021, the central air inlet pipe 4022, the premixing nozzle 4023, the bypass ignition needle assembly 4024, the swirler 403, the gas distributor 4031 and the gas distribution ring

4032. Primary gas nozzle 4033, first auxiliary gas nozzle

4034. Second auxiliary gas nozzle 404 and inner flame tube barrel

405. Manually controlled secondary damper cylinder 4051, pull rod 406, central cylinder

5. Rear cover plate 6, supporting tripod 7 and air door assembly

701. Air door diamond bearing 702, air door pointer 703 and air door dial

704. Air door plate 705, air door shaft 706 and air door connecting rod

707. Air regulating rod assembly 8, first servo motor 9 and air inlet pipeline

10. A flow regulating valve 11, a second servo motor 12, a central gas metal connecting hose 13, a central gas butterfly valve component 14 and an ignition transformer

Detailed Description

For a better understanding and appreciation of the structural features and advantages of the invention, reference will be made to the following detailed description of preferred embodiments thereof, in conjunction with the accompanying drawings, in which:

as shown in fig. 1-7, a multi-layer multi-flame low-nitrogen gas burner comprises a fan assembly 1, a burner control box 2, a burner housing 3, a flame tube assembly 4 and a rear cover plate 5. The burner control box 2 is arranged above the fan assembly 1 through a supporting tripod 6. Combustor casing with the air outlet intercommunication of fan subassembly, air door subassembly 7 is installed with the junction of the air outlet of fan subassembly 1 to combustor casing 3, and air door subassembly 7 drives the switching of air door through connecting first servo motor 8, and first servo motor 8 is connected with the controller in the combustor control box 2, through the switching of controller intelligent control air door. The flame tube assembly 4 is installed on one side of the front end of the combustor shell 3, the rear cover plate 5 covers the other side of the front end of the combustor shell 3, an air inlet pipeline 9 is communicated with the lower end of the rear side of the flame tube assembly 4, a flow regulating valve 10 is installed on the air inlet pipeline 9, the flow regulating valve 10 drives the flow regulating valve to be opened and closed by being connected with a second servo motor 11, the second servo motor 8 is connected with a controller in the combustor control box 2, the size of the gas flow is intelligently controlled through the controller, and the gas can be continuously conveyed to a nozzle from small to large to realize combustion proportion regulation. The fan of the fan component 1 is connected with a third servo motor (not shown in the figure) to drive the fan to start and stop, the third servo motor is connected with a controller in the combustor control box 2, and the controller is an LMV52 Siemens controller and controls the start and stop of the three servo motors to realize the automatic adjustment of the air-fuel ratio. As shown in fig. 4 to 5, the liner assembly 4 includes a liner outer tube 401, a central open flame swirler assembly 402, a gas distributor 403, a liner inner tube 404 and a manually controlled secondary damper tube 405, the liner outer tube 401 is connected to the burner housing 3 through a flange, the central open flame swirler assembly 402 is disposed at the center inside the liner outer tube 401, the front end thereof is covered with the central tube 406, the central tube 406 extends forward beyond the front end of the liner outer tube 401 to form a first level of sufficient combustion of air and fuel, the front end of the manually controlled secondary damper tube 405 covers the rear end of the central tube 406 to form a second level of sufficient combustion of air and fuel, the liner inner tube 404 is covered with the front end of the central tube 406 to form a third level of sufficient combustion of air and fuel, the gas distributor 403 includes a gas distribution ring 4031, a plurality of groups of gas nozzles are disposed equidistantly on the gas distribution ring 4031 to extend toward the front end of the liner 404 and surround the outer side of the liner inner tube 404 to form a fourth level of sufficient combustion of air and fuel. Through the 4 hierarchical structures, combustion air and natural gas are fully mixed in a layered and segmented mode and then enter the hearth from different layers, so that the combustion air and the natural gas are dispersed in the hearth, fully and completely combusted, the phenomenon of over-high temperature generated in the hearth locally is effectively controlled, and the generation of NOx is well controlled.

Specifically, as shown in fig. 7, the central open fire swirler assembly 402 includes a central air inlet pipe 4021, a premixing nozzle 4022, a bypass ignition needle assembly 4023, and a swirler 4024, the rear end of the central air inlet pipe 4021 is communicated with an air inlet pipe 9 through a central air metal connecting hose 12 and a central gas butterfly valve assembly 13, the central gas butterfly valve assembly 13 ensures accurate control of air intake, the swirler 4024 is installed at the front end of the central air inlet pipe 4021, four premixing nozzles 4022 are arranged in groups surrounding the front end of the central air inlet pipe 4021 and communicated with the inside of the central air inlet pipe 4021, two groups are provided, so that the natural gas and air in the central air inlet pipe 4021 are fully and uniformly premixed, the bypass ignition needle assembly 4023 is fixed on the swirler 4024, the swirler 4024 includes an inner ring disk and an outer ring disk, a plurality of swirl vanes are arranged at equal intervals between the inner ring disk and the outer ring disk, the included angle between each swirl vane and the horizontal plane is 35 degrees, the swirl strength of the swirler is 0.7 to 1.4, and the swirl axial component speed is 8m/s to 22m/s. The swirler 4024 stabilizes the flame at the center to ensure the normal operation of the burner; the flame temperature at the center is controlled to effectively control the generation of NOx.

Specifically, as shown in fig. 3, the rear end of the manual control secondary air door cylinder 405 is provided with an upper air door plate and a lower air door plate, the upper air door plate and the lower air door plate are used for manually controlling the opening and closing of the manual control secondary air door cylinder 405 by connecting two pull rods 4051, the pull rod 405 extends into the outer flame cylinder 401 from the rear cover plate 5, so that an operator can manually control the lifting and falling of the pull rod when standing at the rear side of the burner, the upper air door plate and the lower air door plate are in a closed state when the pull rod falls, the upper air door plate and the lower air door plate are in an open state when the pull rod is lifted, so that the air flow can be conveniently regulated, and the front end and the rear end of the manual control air door cylinder 405 are both in a closed state, so that the flow speed of air can be conveniently slowed down.

Preferably, the nozzle of the inner flame tube 404 is open, which is convenient for air and fuel gas to be fully mixed at the front end, so as to fully combust and reduce the generation of NOx.

Specifically, as shown in fig. 5, there are three groups of gas nozzles, a first group is a main gas nozzle 4032, a second group is a first auxiliary gas nozzle 4033, and a third group is a second auxiliary gas nozzle 4034, the nozzles of the main gas nozzle 4032 are staggered inward and outward, the nozzles of the first auxiliary gas nozzle 4033 are both arranged toward the inner flame tube, and the nozzles of the second auxiliary gas nozzle 4034 are arranged forward.

Specifically, as shown in fig. 4 to 6, the damper assembly 7 includes a damper diamond bearing 701, a damper pointer 702, a damper dial 703, a damper plate 704, a damper shaft 705, a damper link 706, an air adjustment rod assembly 707, a connection screw, and the like, and when the damper assembly is assembled before use, the damper diamond bearing 701 is fixed to the combustor housing 3, the damper shaft 705 passes through the damper diamond bearing 701, the position of the damper shaft 701 is adjusted, the screw on the damper diamond bearing 701 is screwed, then the damper plate 704 is fixed to the damper shaft 705 by the screw, and at this time, whether the damper plate is free to rotate is checked. Fixing a first servo motor 8 on a combustor shell 3 through a motor support, then connecting the first servo motor 8 with a throttle shaft 705 through a star coupler, adjusting the position of the star coupler, connecting two throttle shafts 705 through a throttle connecting rod 706 and a connecting screw by an air adjusting rod assembly 707, controlling the throttle plate to be in a horizontal position by finely adjusting the length of the air adjusting rod assembly 707, and simultaneously ensuring the throttle plate to rotate freely without a blocking phenomenon. The air door pointer 702 is fixed on the air door shaft 705, the opening degree of the air door can be read on the air door dial 703 through the rotation of the air door shaft 705, and the air-fuel ratio of the air quantity required by the normal combustion of the burner and the gas mixed at a certain stage can be adjusted through the opening degree of the air door, so that the long-term normal operation of the combustion equipment is ensured.

Specifically, the bypass ignition needle assembly 4023 comprises a bypass ignition metal hose, an ignition high-voltage wire, an ignition needle support, an ignition needle, an ignition tube and a ceramic rod, wherein the bypass ignition needle assembly is fixed on the swirler 4024 through a screw, the tail end of the ignition tube is connected with the bypass ignition metal hose, and the other end of the bypass ignition metal hose is connected with a bypass interface on the combustor shell 3; the ignition needle is installed in the inside of ceramic rod, guarantees that the ignition needle is in the off-state with the outside when the during operation, and the ignition needle end is connected with the ignition high-voltage line, and the other end of ignition high-voltage line passes the cable tapered end on combustor casing 3, extends to on fan subassembly 1 department ignition transformer 14, and its main function is that circular telegram ignition needle forms electric arc, draws the natural gas ignition from the ignition tube, draws the combustor small fire normal combustion 3 seconds later, and 3 seconds later bypass ignition stop motion.

The utility model discloses combustor operation procedure: the method comprises the following steps of boiler operation condition verification → gas pressure verification → gas valve group leakage detection → large air door furnace purging → air door operation to a fire position → ignition transformer operation → ignition solenoid valve operation → ignition flame verification (ignition transformer stop) → main gas valve opening → main flame verification (ignition solenoid valve stop) → load proportion regulation → normal shutdown → furnace post-purging.

In summary, the present invention is only a preferred embodiment, and is not intended to limit the scope of the present invention, and all equivalent changes and modifications of the shapes, structures, features and spirit described in the claims of the present invention should be included in the scope of the present invention.

Claims (7)

1. A multi-layer multi-flame low-nitrogen gas burner comprises a fan component, a burner control box, a burner shell, a flame tube assembly and a rear cover plate, wherein the burner control box is arranged above the fan component through a supporting tripod, the burner shell is communicated with an air outlet of the fan component, the flame tube assembly is arranged on one side of the front end of the burner shell, the rear cover plate is covered on the other side of the front end of the burner shell, and the lower end of the rear side of the flame tube assembly is communicated with an air inlet pipeline, and the multi-layer multi-flame low-nitrogen gas burner is characterized in that the flame tube assembly comprises a flame tube outer barrel, a central open flame swirler component, a gas distributor, a flame tube inner barrel and a manual control secondary air door barrel, the flame tube outer barrel is connected with the burner shell through a flange, the central long open fire swirler assembly is arranged at the center in the flame tube outer cylinder, the front end cover of the central tube is provided with a central tube, the central tube extends forwards to the outside of the front end of the flame tube outer cylinder so as to form a first layer of full combustion of air and fuel, the front end of the manual control secondary air door tube covers the rear end of the central tube so as to form a second layer of full combustion of air and fuel, the flame tube inner cylinder is covered at the front end of the central tube so as to form a third layer of full combustion of air and fuel, the gas distributor comprises a gas distribution ring, a plurality of groups of gas nozzles are arranged at equal distances on the gas distribution ring, extend towards the front end of the flame tube and surround the outer side of the flame tube inner cylinder so as to form a fourth layer of full combustion of air and fuel.

2. The multi-level multi-flame low-nitrogen gas burner as claimed in claim 1, wherein the central open flame swirler assembly comprises a central air inlet pipe, premixing nozzles, bypass ignition needle assemblies and swirlers, the rear end of the central air inlet pipe is communicated with the air inlet pipe through a central air metal connecting hose and a central gas butterfly valve assembly, the swirlers are mounted on the front end of the central air inlet pipe, the premixing nozzles are arranged in groups of four around the front end of the central air inlet pipe and are communicated with the inside of the central air inlet pipe, two groups of the premixing nozzles are arranged, and the bypass ignition needle assemblies are fixed on the swirlers.

3. The multi-level multi-flame low-nitrogen gas burner as claimed in claim 2, wherein the swirler comprises an inner ring disc and an outer ring disc, a plurality of swirl vanes are arranged between the inner ring disc and the outer ring disc at equal intervals, the included angle between each swirl vane and the horizontal plane is 35 degrees, the swirl strength of the swirler is 0.7-1.4, and the axial component velocity of the swirl is 8 m/s-22 m/s.

4. The multi-level multi-flame low-nitrogen gas burner as claimed in claim 1, wherein the rear end of the manual control secondary air door cylinder is provided with an upper air door plate and a lower air door plate, the upper air door plate and the lower air door plate are connected with two pull rods to manually control the opening and closing of the manual control secondary air door cylinder, the pull rods extend from the rear cover plate to the inside of the flame tube outer cylinder, and the front end and the rear end of the manual control air door cylinder are both in a closed shape.

5. The multi-level multi-flame low-nitrogen gas burner as claimed in claim 1, wherein the mouth of the inner flame tube is open.

6. The multi-level multi-flame low-nitrogen gas burner as claimed in claim 1, wherein the gas nozzles are divided into three groups, the first group is a main gas nozzle, the second group is a first auxiliary gas nozzle, and the third group is a second auxiliary gas nozzle, the nozzles of the main gas nozzles are staggered inwardly and outwardly, the nozzles of the first auxiliary gas nozzle are all arranged towards the inner cylinder of the flame tube, and the nozzles of the second auxiliary gas nozzle are arranged forwardly.

7. The multi-level multi-flame low-nitrogen gas burner as claimed in claim 1, wherein a damper assembly is installed at a connection between the burner housing and an air outlet of the fan assembly, the damper assembly drives the damper to open and close by being connected with a first servo motor, a flow control valve is installed on the air inlet pipe, the flow control valve drives the flow control valve to open and close by being connected with a second servo motor, a fan of the fan assembly drives the fan to start and stop by being connected with a third servo motor, and the first servo motor, the second servo motor and the third servo motor are all connected with a controller in the burner control box.

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