CN219530848U - Air classification combustor - Google Patents

Abstract

The utility model relates to the technical field of combustors, and provides an air classifying combustor which comprises a shell, wherein the shell is provided with an air channel and a mixing channel which are communicated, a heat accumulator is arranged in the air channel, a gas pipe is arranged on the shell and is communicated with the mixing channel, the mixing channel is provided with a combustor outlet, the air classifying combustor also comprises a central pipe arranged in the mixing channel, the central pipe is provided with an air inlet which is communicated with the air channel, the air classifying combustor is further provided with a combustion chamber which is communicated with the combustor outlet, the gas pipe is communicated with the combustion chamber, and a gap is reserved between the outer wall of the central pipe and the inner wall of the mixing channel. Through the technical scheme, the problem of more nitrogen oxides generated by the burner in the prior art is solved.

Description

Air classification combustor

Technical Field

The utility model relates to the technical field of combustors, in particular to an air classification combustor.

Background

The heat accumulating flat flame burner is one kind of high efficiency and energy saving burner combining heat accumulating burning technology and flat flame burner. The flat flame burner is a burner with radial plane flame, and consists of a cyclone and a flame path. Air and gas flow forward through the swirler in the whirl, and the two are strong after mixing effectual with gas and air intensive mixing, get into the tubaeform flame path and be igniteed and begin the burning by the ignition nozzle, and the flame path exit whirl flows and forms whirl flame under the effect of centrifugal force, and the diffusion forms disc-shaped planar flame all around, extends along the retaining wall, has even temperature field, can prevent local overheated, guarantees work piece quality.

The heat accumulating combustion is one kind of combustion technology under the condition of high temperature and low oxygen air, and is also called as high temperature air combustion technology, the heat accumulating burner exhausts smoke periodically and stores the heat in the fume into the heat accumulator, and after the normal temperature air exchanges heat with the heat accumulator to form high temperature air, the heated high temperature air enters the hearth and is sucked into the fume inside the furnace to form one thin oxygen-poor high temperature airflow with oxygen content lower than 21% greatly.

However, the combustion rate is increased due to the increase of the temperature of the combustion air, the peak temperature of the flame is increased, a large amount of thermal nitrogen oxides are generated, and the requirements of environmental protection and development are not met, so that the thermal storage flat flame burner needs to be optimized.

Disclosure of Invention

The utility model provides an air classifying burner which solves the problem that nitrogen oxides generated by the burner in the prior art are more.

The technical scheme of the utility model is as follows:

an air staged combustor comprises a housing having an air passage and a mixing passage in communication, a heat accumulator disposed within the air passage, a gas pipe disposed on the housing in communication with the mixing passage, the mixing passage having a combustor outlet, and further comprising,

the central tube is arranged in the mixing channel, the central tube is provided with an air inlet communicated with the air channel and a combustion chamber communicated with the burner outlet, the gas pipe is communicated with the combustion chamber, and a gap is reserved between the outer wall of the central tube and the inner wall of the mixing channel.

As a further technical scheme, the outer wall of the central tube is also provided with a plurality of guide plates.

As a further technical scheme, a plurality of guide plates are uniformly distributed along the circumferential direction, and the guide plates are curved.

As a further technical scheme, the shell is formed by pouring cement casting materials, and the cement casting materials are fixed by anchoring pieces.

As a further technical scheme, the method also comprises the following steps,

light clay bricks are arranged in the air channels, and the heat accumulator is arranged on the light clay bricks;

and the cover plate is arranged on the light clay brick.

As a further technical scheme, the method also comprises the following steps,

and the fire blocking brick is arranged in the air channel and is positioned below the heat accumulator.

As a further technical scheme, the method also comprises the following steps,

and the end cover is arranged on the shell, and the gas pipe is arranged on the end cover.

As a further technical scheme, the burner outlet is a horn mouth.

The working principle and the beneficial effects of the utility model are as follows:

in the utility model, the method of air staged diversion combustion is adopted, so that the tangential swirl injection of the combustion supporting air and the fuel gas are fully mixed for combustion, the fuel utilization rate is improved, the combustion speed and the flame peak temperature are reduced, the energy conservation and the excellent heat transfer capability of the traditional heat accumulating type flat flame combustor are reserved, the nitrogen oxide content is greatly reduced, and the flame combustion condition is improved.

Drawings

The utility model will be described in further detail with reference to the drawings and the detailed description.

FIG. 1 is a schematic cross-sectional view of a burner without a baffle according to the present utility model;

FIG. 2 is a schematic cross-sectional view of a burner with a baffle according to the present utility model;

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

FIG. 4 is a schematic side sectional view of a burner according to the present utility model;

FIG. 5 is a schematic perspective view of a central tube according to the present utility model;

in the figure: 1. the device comprises a shell, 2, an air channel, 3, a mixing channel, 4, a heat accumulator, 5, a gas pipe, 6, a burner outlet, 7, a central pipe, 8, an air inlet, 9, a combustion chamber, 10, a gap, 11, a deflector, 12, a cement casting material, 13, an anchor, 14, a light clay brick, 15, a cover plate, 16, a fire blocking brick, 17 and an end cover.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 5, the present embodiment proposes an air staged burner comprising a housing 1, the housing 1 having an air passage 2 and a mixing passage 3 communicating with each other, a heat accumulator 4 disposed in the air passage 2, a gas pipe 5 disposed on the housing 1 communicating with the mixing passage 3, the mixing passage 3 having a burner outlet 6, further comprising,

the central tube 7 is arranged in the mixing channel 3, the central tube 7 is provided with an air inlet 8 communicated with the air channel 2 and a combustion chamber 9 communicated with the burner outlet 6, the gas pipe 5 is communicated with the combustion chamber 9, and a gap 10 is reserved between the outer wall of the central tube 7 and the inner wall of the mixing channel 3.

In this embodiment, in order to solve the problem that the existing burner generates more nitrogen oxides when in use, the method of air staged diversion combustion is adopted to enable the tangential swirl injection of the combustion-supporting air to be fully mixed with the fuel gas for combustion, thereby improving the fuel utilization rate, reducing the combustion speed and the flame peak temperature, not only retaining the energy saving and excellent heat transfer capability of the existing heat accumulating type flat flame burner, but also greatly reducing the nitrogen oxide content and improving the flame combustion condition.

The specific working principle is as follows: after air and part of flue gas are mixed into low-oxygen combustion-supporting air, the low-oxygen combustion-supporting air enters from an air pipeline and then exchanges heat with the heat accumulator 4 to reach combustion-supporting temperature, and part of high-temperature low-oxygen combustion-supporting air tangentially enters into the combustion chamber 9 of the central tube 7 through the air inlet 8 and is premixed with fuel gas entering through the fuel gas pipe 5 in the combustion chamber 9 to form swirl gas, so that the mixing is more sufficient. At the moment, the oxygen content in the mixed gas is low, the flame burning speed is low after the mixed gas is ignited by the ignition electrode, the flame temperature is low, and the generation of thermal nitrogen oxides can be greatly reduced. Further, since the primary air supply amount is small, the fuel gas is not completely consumed, and the remaining air is discharged through the gap 10 between the center tube 7 and the mixing passage 3, and mixed with the unburned fuel gas outside the combustion chamber 9, and then burned.

Further, the outer wall of the central tube 7 is provided with a plurality of baffles 11.

Further, the plurality of guide plates 11 are uniformly distributed along the circumferential direction, and the guide plates 11 are curved.

In this embodiment, the plurality of deflectors 11 are rotated and emitted according to a certain angle to mix with unburned fuel gas outside the combustion chamber 9, and then the mixture is combusted, and the tangential angle between the deflectors 11 and the air inlet 8 is different, so that the gas disturbance can be continuously enhanced, the combustion is more sufficient, and the temperature required by workpiece processing is formed.

Further, the housing 1 is cast from a cement casting 12, and the cement casting 12 is fixed by an anchor 13.

In this embodiment, the pouring of the cement casting material 12 and the fixation of the anchor 13 are performed in the prior art, and will not be described here.

Further, the method also comprises the steps of,

light clay bricks 14 arranged in the air channels 2, and heat accumulator 4 arranged on the light clay bricks 14;

and a cover plate 15 disposed on the lightweight clay brick 14.

In the embodiment, one side of the heat accumulator 4 is fixed by the light clay brick 14, and the light clay brick 14 is connected with the cover plate 15, so that the heat accumulator 4 is convenient to maintain and replace.

Further, the method also comprises the steps of,

and a fire-blocking brick 16 is arranged in the air channel 2 and is positioned below the heat accumulator 4.

In this embodiment, a firestop brick 16 is also mounted below the heat accumulator 4.

Further, the method also comprises the steps of,

an end cover 17 is arranged on the shell 1, and the gas pipe 5 is arranged on the end cover 17.

Further, the burner outlet 6 is a flare.

In this embodiment, the swirl flame is sprayed from the bell mouth of the burner outlet 6, so that the smoke with low oxygen concentration in the hearth can be sucked in the center of the bell mouth to supply secondary gas combustion, which can also greatly reduce the generation of nitrogen oxide pollutants due to combustion.

The air channel 2 is formed by pouring cement casting material 12, the cement casting material 12 is fixed through the anchoring piece 13, the heat accumulator 4 is arranged under the air channel 2 to store heat, one side of the heat accumulator 4 is fixed by the light clay brick 14, and the light clay brick 14 is connected with the cover plate 15, so that the heat accumulator 4 is convenient to maintain and replace. The air after heat exchange reaches the central tube 7 through the fire-blocking bricks 16, the left side of the central tube 7 is connected with the end cover 17 of the combustion chamber 9, the end cover 17 of the combustion chamber 9 is provided with the gas pipe 5, part of air enters the combustion chamber 9 through the air inlet 8 on the central tube 7 and is premixed with the gas input by the gas pipe 5 for combustion initially, the rest air is mixed with the unburnt gas outside the combustion chamber 9 through a plurality of guide plates 11 and then is combusted continuously, and flame is ejected through the swirl of the burner outlet 6.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (8)

1. An air staged burner comprising a housing (1), said housing (1) having an air channel (2) and a mixing channel (3) in communication, a heat accumulator (4) being arranged in said air channel (2), a gas pipe (5) being arranged on said housing (1) in communication with said mixing channel (3), said mixing channel (3) having a burner outlet (6), characterized in that it further comprises,

the central tube (7) is arranged in the mixing channel (3), the central tube (7) is provided with an air inlet (8) communicated with the air channel (2) and a combustion chamber (9) communicated with the burner outlet (6), the gas pipe (5) is communicated with the combustion chamber (9), and a gap (10) is reserved between the outer wall of the central tube (7) and the inner wall of the mixing channel (3).

2. An air staged burner according to claim 1, characterized in that the outer wall of the central tube (7) is also provided with a plurality of baffles (11).

3. An air staged burner according to claim 2, wherein a plurality of the deflectors (11) are evenly distributed in the circumferential direction, the deflectors (11) being curved.

4. An air staged burner according to claim 1, characterized in that the housing (1) is cast from a cement casting (12), the cement casting (12) being fixed by an anchor (13).

5. An air staged combustor as claimed in claim 1, further comprising,

a lightweight clay brick (14) arranged in the air channel (2), and the heat accumulator (4) is arranged on the lightweight clay brick (14);

and the cover plate (15) is arranged on the light clay brick (14).

6. An air staged combustor as claimed in claim 1, further comprising,

and the fire blocking brick (16) is arranged in the air channel (2) and is positioned below the heat accumulator (4).

7. An air staged combustor as claimed in claim 1, further comprising,

and the end cover (17) is arranged on the shell (1), and the gas pipe (5) is arranged on the end cover (17).

8. An air staged burner according to claim 1, characterized in that the burner outlet (6) is a bell mouth.