CN214120033U - Porous medium combustor and combustion system - Google Patents

Abstract

The embodiment of the application provides a porous medium combustor and a combustion system, and relates to the field of combustors. The porous medium burner comprises a shell, wherein the shell is provided with an air inlet for introducing combustion gas and a heat port for releasing heat outside the shell, a porous medium layer for combusting the combustion gas is arranged in the shell, and a heat insulation layer is attached between the porous medium layer and the shell; the heat exchanger is used for taking away heat of the heat preservation layer and is provided with a channel used for containing a heat exchange medium, the channel surrounds the outer side of the porous medium layer, one end of the channel is provided with a heat exchange medium inlet, and the other end of the channel is provided with a heat exchange medium outlet. The porous medium combustor and the combustion system can reduce the temperature of the heat insulation layer and improve the stability of the combustor.

Description

Porous medium combustor and combustion system

Technical Field

The application relates to the field of combustors, in particular to a porous medium combustor and a combustion system.

Background

The conventional porous medium combustor is provided with the heat insulation plate between a porous medium material and an outer shell, fuel gas is combusted in the porous medium material to form flame and release a large amount of heat, the temperature can reach more than 1400 ℃, and the heat is transmitted outwards through a mode of combining the high-temperature solid radiation effect of the porous medium material and the convection heat exchange of flue gas. Due to the fact that the high-temperature porous medium material conducts heat to the heat insulation board, and meanwhile due to the fact that high-temperature smoke washes the heat insulation board, the temperature of the heat insulation board can reach about 1400 ℃, and therefore the heat insulation board is required to have good high-temperature stability.

At present porous medium combustor is in order to guarantee the gas tightness, and porous medium material and heated board are closely laminated, but in the operation process, the porous medium material of high temperature will produce great thermal expansion and warp, and this very easily leads to heated board and/or heated board cracked, and then leads to the combustor to damage.

Therefore, a porous medium burner which is not easy to damage and has low energy consumption is needed.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one of the above technical problems, embodiments of the present application provide a porous medium burner and a combustion system, which can reduce the temperature of an insulating layer and improve the stability of the burner.

In a first aspect, an embodiment of the present application provides a porous medium burner, which includes a housing, the housing is provided with an air inlet for introducing combustion gas and a heat port for releasing heat to the outside of the housing, a porous medium layer for combusting the combustion gas is arranged in the housing, and a heat insulation layer is arranged between the porous medium layer and the housing; the heat exchanger is used for taking away heat of the heat preservation layer and is provided with a channel used for containing a heat exchange medium, the channel surrounds the outer side of the porous medium layer, one end of the channel is provided with a heat exchange medium inlet, and the other end of the channel is provided with a heat exchange medium outlet.

In the implementation process, combustion gas formed by mixing fuel gas and combustion-supporting gas is introduced into the shell through the gas inlet and is combusted in the porous medium layer, and generated heat is released out through the heat port. In the process of operation of the porous medium combustor, the heat exchanger is arranged in the heat insulation layer of the porous medium combustor, the channel of the heat exchanger surrounds the outer side of the porous medium layer, and heat of the heat insulation layer is taken away through the heat exchange medium, so that the temperature of the heat insulation layer is quickly and effectively reduced, the risks of over-temperature fragmentation of the heat insulation layer and damage of the combustor in the traditional combustor are eliminated, and the stability of the porous medium combustor is improved.

In a possible realization, the channel is C-shaped, O-shaped, spiral or segmented, the two ends of the C-shaped channel being at a distance, the two ends of the O-shaped channel being connected together and separated by a partition.

In the above-mentioned realization process, heat transfer medium entry and heat transfer medium export are adjacent to be set up, and must communicate through whole passageway, and heat transfer medium advances by the heat transfer medium entry promptly, is exported by the heat transfer medium, and flow path must pass through almost whole passageway, and the passageway can be almost totally or completely around wrapping up in the porous medium layer outside in addition, and heat transfer medium flows, can take away the heat that porous medium layer conducted to the heat preservation fast to guarantee the heat transfer effect. Particularly, the C-shaped or O-shaped channel is adopted, the flow of the heat exchange medium in the channel is relatively large, and the heat exchange effect is relatively better.

In one possible implementation, a baffle is provided within the channel.

In the implementation process, the heat exchange medium enters the heat exchanger from the heat exchange medium inlet and passes through the baffle plate in the channel, so that the disturbance of the heat exchange medium can be strengthened, the heat exchange efficiency is improved, and the heated heat exchange medium flows out from the heat exchange medium outlet.

In one possible implementation, the heat exchange medium outlet is in communication with the gas inlet.

In the implementation process, when gas which can be used as combustion-supporting gas (usually air) of the combustor is selected as a heat exchange medium, heated gas flowing out of the heat exchange medium outlet flows into the air inlet through the pipeline to be used as combustion-supporting gas, and is mixed with gas introduced by other pipelines to form combustion gas, so that the thermal efficiency of the combustor is further improved, and the heat waste is reduced.

In a possible realization, the gas inlet is in communication with a main conduit for the introduction of combustion or combustion-supporting gas.

In the implementation process, the combustion gas can be introduced into the air inlet through the main pipeline, or the combustion-supporting gas (the gas flowing out from the heat exchange medium outlet can be adopted) is introduced and is mixed with the gas introduced into other pipelines to form the combustion gas.

In a possible implementation mode, the shell is internally divided into a uniform distribution chamber and a combustion chamber, the uniform distribution chamber is close to the air inlet, a gas uniform distributor is arranged in the uniform distribution chamber, the combustion chamber is close to the heat port, and the porous medium layer is arranged in the combustion chamber.

In the implementation process, the combustion gas is introduced into the shell through the gas inlet, is treated by the gas uniform distributor in the uniform distribution chamber, then uniformly flows into the porous medium layer and is sufficiently combusted, and the generated heat is released out through the heat port.

In a possible realization mode, a gap is reserved between the gas uniform distributor and the porous medium layer, and the width of the gap is 5-10 mm.

In the implementation process, the combustion gas flows to the porous medium layer from the gas uniform distributor, and a gap between the combustion gas and the porous medium layer is equivalent to an equal-pressure cavity and used for stabilizing pressure, so that the combustion gas can stably flow into the porous medium layer for combustion, and the stability of the combustor is improved.

In one possible realization mode, the heat insulation layer is at least positioned in the combustion chamber and wraps the outer side of the porous medium layer.

In one possible implementation, the porous medium layer comprises an upstream sheet for preheating the combustion gas and a downstream sheet for combusting the combustion gas, which are arranged in a stacked manner, the upstream sheet being close to the gas inlet and the downstream sheet being close to the heat port.

In the implementation process, the combustion gas is preheated and then combusted through the upstream piece and the downstream piece, so that the combustion efficiency is improved.

In a second aspect, the present application provides a combustion system, which includes the porous medium burner and the gas boiler provided in the first aspect, and the heat exchange medium outlet is communicated with the gas boiler.

In the implementation process, when water is selected as a heat exchange medium, the porous medium burner is combined with the gas boiler, and the heated water flowing out of the heat exchange medium outlet flows into the gas boiler again, so that heat is recycled, the stability of the burner is improved, and the energy utilization rate is also improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic structural view of a porous medium burner provided in a first embodiment of the present application;

FIG. 2 is a schematic view of the heat exchanger of FIG. 1 from another perspective;

FIG. 3 is a schematic structural view of a porous medium burner provided in a second embodiment of the present application;

fig. 4 is a schematic structural diagram of a porous medium burner provided in a third embodiment of the present application.

Icon: 100-a porous medium burner; 110-a housing; 111-an air inlet; 112-heat port; 120-an insulating layer; 130-a porous dielectric layer; 131-an upstream sheet; 132-a downstream sheet; 140-a heat exchanger; 141-channel; 142-a heat exchange medium inlet; 143-heat exchange medium outlet; 144-a baffle plate; 150-a gas uniform distributor; 160-a main conduit; 200-a porous medium burner; 210-an insulating layer; 220-gas uniform distributor; 230-a main conduit; 240-a pipeline; 250-a gas pipeline; 260-an air disperser; 300-porous medium burner; 310-pipe.

Detailed Description

The existing porous medium burner is divided into a premixing porous medium burner and a mixing porous medium burner according to the introduction mode of combustion gas, the premixing porous medium burner firstly pre-mixes the combustion gas including gas and combustion-supporting gas (usually air) and then introduces the premixed combustion gas into the burner, and the mixing porous medium burner directly mixes the combustion gas including gas and combustion-supporting gas into the burner.

However, during the operation of the conventional premixing porous medium burner and the mixing porous medium burner, the porous medium material and the insulating layer on the outer side of the porous medium material are at risk of being broken, and the burner is damaged. The inventor analyzes the reason, because the insulation board is generally made of oxide ceramic with low thermal conductivity and high thermal expansion coefficient in order to achieve the insulation effect, the insulation board contacting with the porous medium material can generate larger thermal expansion deformation. The porous medium material and the insulation board are expanded and extruded, and the porous medium material generates great thermal stress in a high-temperature environment, so that the porous medium material has great risk of cracking; simultaneously because the high temperature flue gas is to the scouring action of heated board, the heated board also changes in cracked, and then leads to the combustor to damage.

In addition, the inventor also finds that in the operation process, the temperature of the heat insulation plate is high, the temperature of the outer shell in contact with the heat insulation plate is low, and the heat of the heat insulation plate is conducted to the outer shell of the combustor in a large amount in a heat conduction mode, so that the energy consumption of the combustor is increased.

In order to solve the technical problem, the inventor creatively provides a porous medium combustor (can be for mixing formula porous medium combustor in advance, also can be for mixing formula porous medium combustor promptly) and combustion system, it need not changing the material of heat preservation, so do not influence the heat preservation effect, also need not change the setting mode of heat preservation and porous medium material, so do not influence the combustion effect, only reduce the temperature of heat preservation through the mode of heat transfer medium heat transfer, thereby reduce the broken risk of heat preservation, and can also collect the heat, be favorable to the heat to recycle, thereby improve the thermal efficiency.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found in use of products of the application, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

First embodiment

Referring to fig. 1 and fig. 2, the porous medium burner 100 provided in this embodiment is a premix porous medium burner 100, and the porous medium burner 100 includes a casing 110, the casing 110 is provided with an air inlet 111 for introducing combustion gas and a heat outlet 112 for releasing heat to the outside of the casing 110, a porous medium layer 130 for combusting the combustion gas is provided in the casing 110, and an insulating layer 120 is attached between the porous medium layer 130 and the casing 110. In general, the air inlet 111 and the heat port 112 of the porous medium burner 100 are disposed at two opposite ends of the casing 110, and the axes of the casing 110, the porous medium layer 130 and the insulating layer 120 are in the same direction. It should be noted that the heat port 112 is not limited to an open design, as long as heat can be radiated outward. Since the combustion in the porous medium layer 130 is effective, the porous medium layer 130 is closely attached to the insulating layer 120 outside the porous medium layer 130 to prevent the combustion gas from leaking from the gap and affecting the combustion effect.

In order to ensure the combustion effect, the combustion gas is uniformly distributed and then combusted, the interior of the shell 110 is divided into a uniform distribution chamber and a combustion chamber, the uniform distribution chamber is close to the gas inlet 111, a gas uniform distributor 150 is arranged in the uniform distribution chamber, the combustion chamber is close to the heat port 112, and the porous medium layer 130 is arranged in the combustion chamber. A gap is reserved between the gas uniform distributor 150 and the porous medium layer 130, and the width of the gap is generally 5-10 mm.

The combustor of the embodiment of the application is the premixing porous medium combustor 100, namely, the premixed combustion gas is introduced, the gas uniform distributor 150 is a common gas uniform distribution pore plate, the uniform distribution effect can be realized, and the gas inlet 111 is communicated with a main pipeline 160 for introducing the premixed combustion gas.

In this embodiment, the porous medium layer 130 includes an upstream sheet 131 and a downstream sheet 132 which are stacked, the upstream sheet 131 is close to the air inlet 111, the downstream sheet 132 is close to the heat outlet 112, and the pore directions of the upstream sheet 131 and the downstream sheet 132 are perpendicular, that is, the pore direction of the upstream sheet 131 is the same as the axial direction. In other embodiments, the porous medium layer 130 may also adopt other combination methods of porous medium materials, and only needs to be capable of realizing combustion in the inner pores thereof.

In order to achieve the heat preservation effect, the heat preservation layer 120 is at least located in the combustion chamber and wraps the outer side of the porous medium layer 130, in this embodiment, the heat preservation layer 120 mainly wraps the outer side of the porous medium layer 130, and a small part of the heat preservation layer 120 is also located in the uniform distribution chamber.

Specifically, referring to fig. 2, a heat exchanger 140 for taking away heat of the insulating layer 120 is further disposed in the insulating layer 120, the heat exchanger 140 has a channel 141 for accommodating a heat exchange medium, the channel 141 surrounds the outside of the porous medium layer 130, and one end of the channel 141 is provided with a heat exchange medium inlet 142 and the other end is provided with a heat exchange medium outlet 143. Flexibility in the heat transfer media selected for different operating conditions, including but not limited to air, water, oil, etc.

It should be noted that the channel 141 may be C-shaped, O-shaped, or other shapes, and may also be spiral or segmented, the C-shaped or O-shaped is an integral structure, which means that the cross section of the channel 141 perpendicular to the axis is C-shaped or O-shaped, and the C-shaped or O-shaped means that two ends of the cross section are adjacent, but not directly connected, but must be connected through the whole channel 141. Specifically, the two ends of the C-shaped channel 141 are separated by a certain distance, and the two ends of the O-shaped channel 141 are connected together and separated by a partition plate, in this embodiment, the channel 141 is C-shaped, that is, the two ends are separated by a certain distance. In addition, the C-shape or the O-shape in the present application only indicates that it forms a surrounding state for the porous medium layer 130, and both ends can communicate only through the surrounding path; the channel 141 may be circular, oval, triangular, rectangular or other polygonal shapes, and in this embodiment, the channel 141 is rectangular. In other embodiments, the channels 141 may be spiral or segmented, so long as the heat exchange medium can flow through the channels and the porous medium layer 130 is surrounded by the channels.

In general, in order to ensure the heat exchange effect, the shape of the heat exchanger 140 is identical to the shape of the combustion head of the porous medium burner 100, and if the combustion head is circular, the shape of the heat exchanger 140 (the cross section perpendicular to the axis) is also circular, that is, the channel 141 is circular.

In this embodiment, a baffle 144 is further disposed in the channel 141, and the shape of the baffle 144 includes, but is not limited to, a flat plate, a curved plate, a stepped plate, and the like.

The operation of the pre-mixing porous medium burner 100 with the heat exchanger 140 of the present embodiment is as follows:

combustion gas formed by premixing fuel gas and air enters the shell 110 from the air inlet 111 through the main pipeline, passes through the gas uniform distribution pore plate of the uniform distribution chamber, then uniformly flows into the upstream sheet 131 of the porous medium layer 130 for preheating, and finally flows into the downstream sheet 132 for combustion.

In the above process, the heat exchange medium enters from the heat exchange medium inlet 142, passes through the channel 141, and flows out from the heat exchange medium outlet 143, and flows around the porous medium layer 130 through the heat exchange medium in the heat exchanger 140, so that the temperature of the insulating layer 120 is reduced, and the temperature is prevented from being too high.

Second embodiment

Referring to fig. 2 and fig. 3, the present embodiment provides a porous medium burner 200, and the structure of the porous medium burner 200 is substantially the same as that of the porous medium burner 100 of the first embodiment, except that:

the burner of the embodiment of the application is a mixing type porous medium burner 200, namely, gas and combustion-supporting gas are respectively introduced and then mixed. To ensure uniform mixing in this mixing mode, the gas distributor 220 preferably also performs the mixing function as well as the distribution function. Optionally, the gas distributor 220 is the distributor in the invention patent application with application number 202010583972.3, specifically, the distributor has a plurality of first flow channels and a plurality of second flow channels, the plurality of first flow channels are provided with a gas inlet, the plurality of second flow channels are provided with a combustion-supporting gas inlet, and the plurality of first flow channels and the plurality of second flow channels are all used for communicating with the combustion chamber.

In this embodiment, the insulating layer 210 only covers the outer side of the porous medium layer 130.

In order to realize the reuse of heat taken away by the heat exchange medium, air is selected as the heat exchange medium in this application, and heat exchange medium outlet 143 passes through pipeline 240 and air inlet 111 intercommunication, and pipeline 240 is provided with heat preservation 210 outward, for example, the heat preservation is cotton to reduce pipeline 240's calorific loss. To the great operating mode of combustion-supporting airflow, in order to guarantee the volume of letting in of air (combustion-supporting gas), air inlet 111 still communicates with the trunk line 230 that lets in air (combustion-supporting gas), and is concrete, air inlet 111 and trunk line 230 intercommunication, heat transfer medium export 143 passes through pipeline 240 and trunk line 230 intercommunication, set up air spreader 260 in trunk line 230, the hot-air after being about to heat lets in the equipartition room through the inlet port simultaneously through air spreader 260 and air, in addition, still set up gas pipeline 250 and let in the gas toward the equipartition indoor.

The instant mixing type porous medium burner 200 provided with the heat exchanger 140 in the embodiment is suitable for the working condition with larger combustion-supporting gas flow, and the working process is as follows:

during the operation of the burner, air (heat exchange medium) is introduced from the heat exchange medium inlet 142, passes through the channel 141, absorbs heat generated by combustion in the porous medium layer 130, and flows out from the heat exchange medium outlet 143, so that the temperature of the heat insulation layer 210 is reduced.

Heated air is introduced into the main pipe 230 from the heat exchange medium outlet 143 through the pipeline 240 and the air spreader 260, normal temperature air is also introduced into the main pipe 230 to be mixed, and then introduced into the gas uniform distributor 220 of the uniform distribution chamber, gas is also introduced into the gas uniform distributor 220 of the uniform distribution chamber through the gas pipeline 250, and the gas and the air independently and uniformly enter the porous medium layer 130 to be combusted after passing through the gas uniform distributor 220.

Third embodiment

Referring to fig. 2 and 4, the porous medium burner 300 of the present embodiment, and the porous medium burner 200 of the second embodiment have substantially the same structure, except that:

for the working condition that the flow of the combustion-supporting gas is small, the heat exchange medium outlet 143 is directly communicated with the gas inlet 111 through the pipeline 310, and other pipelines for introducing air are not additionally arranged.

The instant mixing type porous medium burner 300 additionally provided with the heat exchanger 140 is suitable for the working condition with smaller combustion-supporting gas flow, and the working process is as follows:

during the operation of the burner, air (heat exchange medium) is introduced from the heat exchange medium inlet 142, passes through the channel 141, absorbs heat generated by combustion in the porous medium layer 130, and flows out from the heat exchange medium outlet 143, so that the temperature of the heat insulation layer 120 is reduced.

Heated air is introduced into the gas uniform distributor 220 through the heat exchange medium outlet 143 through the pipeline 310, fuel gas is introduced into the gas uniform distributor 220 of the uniform distribution chamber through the fuel gas pipeline 250, and the fuel gas and the air independently and uniformly enter the porous medium layer 130 to be combusted after passing through the gas uniform distributor 220.

To sum up, porous medium combustor and combustion system of this application embodiment, its temperature that can reduce the heat preservation improves the stability of combustor.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A porous medium burner is characterized by comprising a shell, wherein the shell is provided with an air inlet for introducing combustion gas and a heat port for releasing heat outside the shell, a porous medium layer for combusting the combustion gas is arranged in the shell, and a heat insulation layer is attached between the porous medium layer and the shell; the heat-insulating layer is internally provided with a heat exchanger used for taking away heat of the heat-insulating layer, the heat exchanger is provided with a channel used for accommodating a heat exchange medium, the channel surrounds the outer side of the porous medium layer, one end of the channel is provided with a heat exchange medium inlet, and the other end of the channel is provided with a heat exchange medium outlet.

2. The porous medium burner of claim 1, wherein the channel is C-shaped, O-shaped, spiral, or segmented, wherein the ends of the C-shaped channel are spaced apart, and wherein the ends of the O-shaped channel are connected together and separated by a separator.

3. The porous medium burner of claim 1 or 2, wherein a baffle is disposed within the channel.

4. The porous medium burner of claim 1, wherein the heat exchange medium outlet is in communication with the air inlet.

5. The porous medium burner of claim 1 or 4, wherein the gas inlet is further in communication with a main conduit for the introduction of combustion or combustion-supporting gas.

6. The porous medium burner of claim 1, wherein the housing is divided into a distribution chamber and a combustion chamber, the distribution chamber is adjacent to the gas inlet, a gas distributor is disposed in the distribution chamber, the combustion chamber is adjacent to the heat port, and the porous medium layer is disposed in the combustion chamber.

7. The porous medium burner of claim 6, wherein a gap is left between the gas uniform distributor and the porous medium layer, and the width of the gap is 5-10 mm.

8. The porous medium burner of claim 1, wherein the insulating layer is at least located in the combustion chamber and wraps outside of the porous medium layer.

9. The porous medium burner of claim 1, wherein the porous medium layer comprises an upstream sheet for preheating combustion gas and a downstream sheet for combustion of the combustion gas, the upstream sheet being adjacent to the gas inlet, and the downstream sheet being adjacent to the heat port, which are arranged in a stack.

10. A combustion system comprising a porous medium burner according to any one of claims 1 to 9 and a gas boiler, said heat exchange medium outlet being in communication with said gas boiler.

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