CN209893396U

CN209893396U - Multi-nozzle metal fiber burner

Info

Publication number: CN209893396U
Application number: CN201920043283.6U
Authority: CN
Inventors: 段增宾; 高士军
Original assignee: Zhongke Energy Saving Environmental Protection Equipment (tianjin) Co Ltd
Current assignee: Zhongke Energy Saving Environmental Protection Equipment (tianjin) Co Ltd
Priority date: 2019-01-10
Filing date: 2019-01-10
Publication date: 2020-01-03
Anticipated expiration: 2029-01-10

Abstract

The utility model discloses a many spouts metal fiber combustor, gas and air admission mix the room in advance, let in the combustion head after fan one, fan two and splitter plate intensive mixing. When the gas concentration near the air entraining pipe part in the combustion head is low, the flow speed of the gas in the air entraining pipe is increased through the fan, the gas pushes the blocking piece to move, the area of the through hole which is blocked by the baffle is reduced, and the gas flow through the through hole is increased. The mixed gas is adjusted by the device and then uniformly distributed to each part of the combustion head, and then the mixed gas overflows from overflow holes uniformly distributed on the supporting cavity and is combusted on the metal fiber felt, so that uniform thin free flame is formed on the metal fiber felt. The utility model discloses the device can control the gas concentration of each part combustion head accurately, ensures that each part temperature of combustion head is even, has avoided the gas to get into the local high-temperature area that the fuel high concentration region of combustion head formation forms through same entry in traditional design.

Description

Multi-nozzle metal fiber burner

Technical Field

The utility model belongs to the technical field of the combustor technique and specifically relates to a many spouts metal fiber combustor is related to.

Background

The theory of gas surface combustion was proposed as early as the beginning of the 20 th century, but gas infrared burners were not developed much until the 50 th century. In 1956, schwankel of german developed a porous ceramic plate gas infrared radiator which was immediately popularized and applied. In the 60 s of the 20 th century, due to the development of high-temperature metal materials, a metal gas infrared radiator appears in the United states, is quickly used for local heating or indoor heating of tall buildings, and is successfully used for overall radiation heating, so that a remarkable effect is achieved. Then, a burner made of metal fiber has been developed, which is used in food drying and textile industries due to its advantages of rapid reactivity and cooling property, shape variability, controllability of thermal expansion, etc., and has high thermal efficiency and low pollutant discharge amount.

The metal fiber burner is a full-premix blue flame type burner, takes special metal fiber as a burning surface, and has the burning intensity of 10000kw/m³The metal fiber combustion technology has the advantages of low NOx and CO emission rate, small pressure loss, high combustion efficiency, compact structure and wide load regulation ratio of thermodynamic equipment. For the generation of nitrogen oxides, the higher the combustion temperature is, the larger the generation amount of the nitrogen oxides is, the metal fiber combustor belongs to premixed gas surface combustion, a premixed and uniform gas-air mixture flows to the head of the combustor, combustion is carried out on the surface layer of metal fiber fabric with uniform air permeability, so that combustion is stable and uniformly distributed, premixed combustion has very thin free flame, but because the heat transfer of mixed gas is insufficient, chemical reaction is carried out in a very narrow area, chemical reaction of other spaces of a combustion chamber is slow, so that local high temperature is caused, and burnout degree and pollution emission are high, in the prior art, the generation amount of a part of the nitrogen oxides can be reduced by adding a wire mesh with high heat conductivity and high radiation rate at the head of the combustor, but the high temperature resistance of the combustor is often influenced by adding the wire meshes with different materials,and the different wire mesh thermal expansion coefficient of material is different, and the wire mesh inside can produce the internal stress after being heated, also can influence the life of combustor. Therefore, how to precisely adjust and control the distribution of the combustible gas, ensure the uniform distribution of the combustible gas on the surface of the combustion head, avoid the generation of high-temperature areas, and enable the combustion to be more sufficient, thereby effectively reducing the emission of nitrogen oxides, which is a problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the problem among the above-mentioned background art, provide one kind through setting up many bleed pipes and adjust and control the distribution of combustible gas in the combustion head minutely, guarantee the even many spouts metal fiber combustor of each partial temperature of combustion head.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the multi-nozzle metal fiber combustor comprises an air-gas mixing device, an ignition system and a combustion head, wherein the air-gas mixing device, the ignition system and the combustion head are sequentially connected in series. Set up many spouts bleed air device in the combustion head, many spouts bleed air device includes fuel nozzle, and bleed pipe, fuel nozzle sets up the entrance at the combustion head, bleed pipe stretches into the inside of combustion head, be equipped with the fan of gas velocity of flow in the bleed pipe, bleed pipe is close to and is equipped with the through-hole on the orificial pipe wall, the through-hole is close to the lateral wall of orificial one side and goes up the concave recess 4125 that is equipped with, the recess tank bottom is equipped with the elastic component, it is equipped with the baffle to slide in the recess, the baffle is connected with the elastic component, when the elastic component is lax state, the baffle shelters from partial through-hole, be equipped with on the baffle and block.

Preferably, the air-gas mixing device comprises an air inlet unit and a mixing unit, the air inlet unit comprises a premixing chamber, a gas storage chamber and an air filter, the premixing chamber is connected with the gas storage chamber, a first control valve is arranged between the premixing chamber and the gas storage chamber, the premixing chamber is connected with the air filter, a second control valve is arranged between the premixing chamber and the air filter, the gas storage chamber and the air filter are uniformly distributed on the premixing chamber, the outer wall of the mixing unit is a cylinder with openings at two ends, a first fan and a second fan are oppositely arranged in the cylinder, a splitter vane is arranged between the first fan and the second fan, and an outlet of the premixing chamber is connected with the first fan.

Preferably, the ignition system comprises an ignition chamber, an ignition electrode rod arranged in the ignition chamber, a heat insulation plate and a Venturi tube arranged in the heat insulation plate, wherein two electrodes of the ignition electrode rod are opposite to the inlet of the Venturi tube, the Venturi tube is made of shape memory alloy, the Venturi tube is in a Venturi tube shape at low temperature, and the Venturi tube is in a sealed shape which can not be passed by gas at high temperature.

Preferably, the combustion head comprises a supporting cavity and a metal fiber felt wrapping the supporting cavity, the supporting cavity is of a cavity structure with one end provided with a closed end and the other end provided with an open end, and a plurality of overflow holes are uniformly distributed in the supporting cavity.

Preferably, the side wall of the groove close to the gas delivery is provided with a hole for moving the blocking member.

Preferably, the multi-jet bleed air arrangement comprises a plurality of bleed air ducts.

Compared with the prior art, the invention has the beneficial effects that:

1. the utility model discloses a set up many bleed pipes of different length at the combustion head and supply the gas in time, guarantee roughly that the gas concentration of each part combustion head is even, then through the velocity of flow of the gas of control bleed pipe in, remove the piece that stops, the area of through-hole is sheltered from to the control baffle, and then control the gas concentration of each part combustion head accurately, guarantee that each part temperature of combustion head is even;

2. after the gas and the air in the air-gas mixing device are subjected to convection primary mixing in the premixing chamber, the mixture is conveyed to the fan II after being mixed by the fan I, and small vortexes are formed by the splitter blades during the mixing, so that the air-gas mixing device performs four-step mixing on the gas and the air, and the gas reaching the first combustion head is mixed very uniformly;

3. after the ignition electrode bar in the ignition system ignites the fuel gas in the first combustion head through the Venturi tube, the Venturi tube is heated and deformed into a closed shape through which the gas cannot pass, and the ignition chamber forms a closed space, so that the ignition electrode bar cannot be roasted by flame, the service life of the ignition electrode bar can be prolonged, and the ignition reliability of the ignition electrode bar is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a combustion nozzle and bleed air duct configuration;

FIG. 3 is an enlarged view of a portion a of FIG. 2;

FIG. 4 is a schematic structural view of a device for adjusting the size of the through hole of the bleed air pipe near the nozzle part;

FIG. 5 is a cross-sectional view of the bleed air duct;

FIG. 6 is a schematic view of a combustion head configuration.

The reference numerals are explained below: 1. an air intake unit; 11. a premixing chamber; 12. a gas storage chamber; 13. a first control valve; 14. an air cleaner; 15. a second control valve; 2. a mixing unit; 21. a first fan; 22. a splitter plate; 23. a second fan; 3. an ignition system; 31. an ignition electrode rod; 32. a venturi tube; 33. a heat insulation plate; 4. a burner head; 41. a multi-nozzle air entraining device; 411. a fuel nozzle; 412. a bleed pipe; 4121. a through hole; 4122. a baffle plate; 4123. an elastic member; 4124. a blocking member; 4125. a groove; 413. a fan; 42. a support cavity; 43. an overflow aperture; 44. a metal fiber mat.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that as used in the following description, the terms "front," "back," "left," "right," "upper," and "lower" refer to directions in the drawings, and the terms "bottom" and "top," "inner," and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Example 1:

as shown in fig. 1 to 5, the multi-nozzle metal fiber burner comprises an air-gas mixing device, an ignition system 3 and a burner head 4, wherein the air-gas mixing device, the ignition system 3 and the burner head 4 are sequentially connected in series. The multi-nozzle air-entraining device 41 is arranged in the combustion head 4, the multi-nozzle air-entraining device 41 comprises a fuel nozzle 411 and an air-entraining pipe 412, the fuel nozzle 411 is arranged at an inlet of the combustion head 4, the air-entraining pipe 412 extends into the combustion head 4, a through hole 4121 is arranged on a pipe wall of the air-entraining pipe 412 close to a pipe opening, a groove 4125 is concavely arranged on a side wall of the through hole 4121 close to one side of the pipe opening, an elastic member 4123 is arranged at the bottom of the groove 4125, a baffle 4122 is slidably arranged in the groove 4125, the baffle 4122 is connected with the elastic member 4123, when the elastic member 4123 is in a loose state, the baffle 4122 shields part of the through hole 4121, a blocking member 4124 is arranged on the baffle 4122, and the blocking member. When the concentration of the fuel gas in the combustion head 4 near the bleed air pipe 412 is low, the flow rate of the fuel gas in the bleed air pipe 412 is increased by the fan 413, the fuel gas pushes the blocking member 4124 to move, the elastic member 4123 at the bottom of the groove 4125 is compressed, the blocking member 4122 moves along with the blocking member 4124, the area of the blocking member 4122 blocking the through hole 4121 is reduced, and the flow rate of the fuel gas passing through the through hole 4121 is increased. Therefore, the utility model discloses the device can control the gas concentration of each part burner 4 accurately, ensures that each part temperature of burner 4 is even, has avoided the local high-temperature region that the fuel high concentration region that the gas got into the burner 4 through same entry and formed in the traditional design to form.

As shown in fig. 1, the air-gas mixing device includes an air inlet unit 1 and a mixing unit 2, the air inlet unit 1 includes a premixing chamber 11, a gas storage chamber 12 and an air filter 14, the premixing chamber 11 is connected with the gas storage chamber 12, a first control valve 13 is arranged between the premixing chamber 11 and the air filter 14, a second control valve 15 is arranged between the premixing chamber 11 and the air filter 14, the gas storage chamber 12 and the air filter 14 are uniformly distributed on the premixing chamber 11, the outer wall of the mixing unit 2 is a cylinder with openings at two ends, a first fan 21 and a second fan 23 are oppositely arranged in the cylinder, a splitter 22 is arranged between the first fan 21 and the second fan 23, and an outlet of the premixing chamber 11 is connected with the first fan 21. After the gas and the air in the air-gas mixing device are subjected to convection primary mixing in the premixing chamber 11, the gas and the air are mixed by the first fan 21 and then are conveyed to the second fan 23, and small vortexes are formed by the splitter vane 22 during the mixing process and are further mixed, so that the gas and the air are mixed by the air-gas mixing device in four steps, and the gas reaching the first combustion head 4 is mixed very uniformly.

As shown in fig. 1, the ignition system 3 includes an ignition chamber, an ignition electrode rod 31 disposed in the ignition chamber, a heat shield plate 33, and a venturi tube 32 disposed in the heat shield plate 33, wherein both electrodes of the ignition electrode rod 31 are opposite to an inlet of the venturi tube 32, the venturi tube 32 is made of a shape memory alloy, and has a shape of the venturi tube 32 at a low temperature and a sealed shape at a high temperature, through which gas cannot pass. After the ignition electrode rod 31 in the ignition system 3 ignites the fuel gas in the first combustion head 4 through the venturi tube 32, the venturi tube 32 is heated and deformed into a sealed shape through which the gas cannot pass, and the ignition chamber forms a sealed space, so that the ignition electrode rod 31 cannot be burned by flame, the service life of the ignition electrode rod 31 can be prolonged, and the ignition reliability of the ignition electrode rod is improved.

As shown in fig. 6, the combustion head 4 includes a supporting cavity 42 and a metal fiber mat 44 wrapping the supporting cavity 42, the supporting cavity 42 is a cavity structure with a closed end at one end and an open end at the other end, and a plurality of overflow holes 43 are uniformly distributed on the supporting cavity 42. The gas is distributed uniformly to all parts of the combustion head 4 by the multi-nozzle gas-guiding device 41, and then the gas overflows from the overflow holes 43 uniformly distributed on the supporting cavity 42 and is combusted on the metal fiber felt 44, so that uniform thin free flame is formed on the metal fiber felt 44.

The groove 4125 is provided with a hole for movement of the blocking member 4124 on the side wall near the gas delivery. If the hole is not provided, the stopper 4124 moves by the length from the point of connection of the stopper 4124 and the shutter 4122 to the edge of the groove 4125, and if the hole is provided, the stopper moves by the length from the point of connection of the stopper 4124 and the shutter 4122 to the edge of the hole, the provision of the hole can shorten the length of the shutter 4122, saving material.

The multi-nozzle air-entraining device 41 comprises a plurality of air-entraining pipes 412, and the lengths of the air-entraining pipes 412 extending into the combustion heads 4 are different, so that the fuel gas of each part of the combustion heads 4 can be supplemented in time, and the fuel gas concentration of each part of the combustion heads 4 is ensured to be uniform.

As shown in fig. 1 to 6, the working principle is as follows: gas enters the premixing chamber 11 from the gas storage chamber 12 through the first control valve 13, air enters the premixing chamber 11 from the air filter 14 through the second control valve 15, and the gas and the air form convection to be primarily mixed. The mixed gas (fuel gas and air) is mixed by the first fan 21 and then is conveyed to the second fan 23, and small vortex is formed by the mixed gas passing through the splitter plate 22 during the period, so that the mixed gas is further mixed. The mixed gas is uniformly mixed and then is conveyed to the combustion head 4 through the multi-nozzle air entraining device 41, the ignition electrode rod 31 in the ignition system 3 ignites the fuel gas in the combustion head 4 through the venturi tube 32, the venturi tube 32 is heated and deformed into a closed shape which can not be passed through by the gas, and the ignition chamber forms a closed space. The mixed gas enters the combustion head 4 from the fuel nozzles 411 and the air-entraining pipes 412 of the multi-nozzle air-entraining device 41 respectively. When the concentration of the fuel gas in the combustion head 4 near the bleed air pipe 412 is low, the flow rate of the fuel gas in the bleed air pipe 412 is increased by the fan 413, the fuel gas pushes the blocking member 4124 to move, the elastic member 4123 at the bottom of the groove 4125 is compressed, the blocking member 4122 moves along with the blocking member 4124, the area of the blocking member 4122 blocking the through hole 4121 is reduced, and the flow rate of the fuel gas passing through the through hole 4121 is increased. When the concentration of the fuel gas in the combustion head 4 near the bleed air pipe 412 is higher, the flow speed of the fuel gas in the bleed air pipe 412 is reduced by the fan 413, the elastic member 4123 at the bottom of the groove 4125 pushes the baffle 4122, the area of the through hole 4121 shielded by the baffle 4122 is increased, and the fuel gas flow through the through hole 4121 is reduced. The mixed gas is distributed uniformly to all parts of the combustion head 4 through the multi-nozzle bleed air device 41, and then the mixed gas overflows from the overflow holes 43 uniformly distributed on the support cavity 42 and is combusted on the metal fiber felt 44, and uniform thin free flames are formed on the metal fiber felt 44. The utility model discloses the device can control the gas concentration of each part burner 4 accurately, ensures that each part temperature of burner 4 is even, has avoided the gas to get into the local high-temperature region of the regional formation of the fuel high concentration that burner 4 formed through same entry in traditional design.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. The multi-nozzle metal fiber combustor comprises an air-gas mixing device, an ignition system (3) and a combustion head (4), wherein the air-gas mixing device, the ignition system (3) and the combustion head (4) are sequentially connected in series, and the multi-nozzle metal fiber combustor is characterized in that the combustion head (4) is internally provided with a multi-nozzle air entraining device (41), the multi-nozzle air entraining device (41) comprises a fuel nozzle (411) and an air entraining pipe (412), the fuel nozzle (411) is arranged at an inlet of the combustion head (4), the air entraining pipe (412) extends into the combustion head (4), the air entraining pipe (412) is internally provided with a fan (413) for the flow rate of gas, the air entraining pipe (412) is provided with a through hole (4121) close to the pipe orifice, the side wall of the through hole (4121) close to one side of the pipe orifice is concavely provided with a groove (4125), the groove bottom of the groove (4125) is provided with an elastic piece (41, a baffle plate (4122) is arranged in the groove (4125) in a sliding mode, the baffle plate (4122) is connected with the elastic piece (4123), when the elastic piece (4123) is in a loose state, the baffle plate (4122) shields a part of through holes (4121), a blocking piece (4124) is arranged on the baffle plate (4122), and the blocking piece (4124) is located in the air entraining pipe (412) and perpendicular to the flowing direction of the fuel gas.

2. The multi-nozzle metal fiber burner according to claim 1, wherein the air-gas mixing device comprises an air inlet unit (1) and a mixing unit (2), the air inlet unit (1) comprises a premixing chamber (11), a gas storage chamber (12) and an air filter (14), the premixing chamber (11) is connected with the gas storage chamber (12) and a control valve I (13) is arranged between the premixing chamber (11) and the gas storage chamber (12), the premixing chamber (11) is connected with the air filter (14) and a control valve II (15) is arranged between the premixing chamber (11) and the air filter (14), the gas storage chamber (12) and the air filter (14) are uniformly distributed on the premixing chamber (11), the outer wall of the mixing unit (2) is a cylinder with openings at two ends, a fan I (21) and a fan II (23) are oppositely arranged in the cylinder, and a splitter plate (22) is arranged between the fan I (21) and the fan II (23), the outlet of the premixing chamber (11) is connected with the first fan (21).

3. The multi-nozzle metal fiber burner as claimed in claim 1, wherein the ignition system (3) comprises an ignition chamber, an ignition electrode rod (31) disposed in the ignition chamber, a heat insulation plate (33), and a venturi tube (32) disposed in the heat insulation plate (33), two electrodes of the ignition electrode rod (31) are opposite to an inlet of the venturi tube (32), the venturi tube (32) is made of shape memory alloy, the venturi tube (32) is shaped as a venturi tube (32) at low temperature, and the venturi tube is sealed at high temperature, which is not permeable to gas.

4. A multi-nozzle metal fiber burner according to claim 1, wherein the burner head (4) comprises a supporting cavity (42) and a metal fiber felt (44) wrapping the supporting cavity (42), the supporting cavity (42) is a cavity structure with a closed end at one end and an open end at the other end, and a plurality of overflow holes (43) are uniformly distributed on the supporting cavity (42).

5. A multi-jet metal fiber burner as claimed in claim 1, wherein said grooves (4125) are provided with holes for the movement of said blocking member (4124) on the side wall close to the gas delivery.

6. Multi-jet metal fiber burner according to claim 1 or 5, characterized in that said multi-jet air-entraining device (41) comprises at least one of said air-entraining ducts (412).