CN112212374A - Hearth and combustion furnace - Google Patents

Abstract

The invention provides a hearth and a combustion furnace, wherein the hearth comprises an outer shell and an inner shell, the upper part of the inner shell is connected with the outer shell, the lower part of the inner shell is also connected with the outer shell, and a waste gas cavity is formed between the inner shell and the outer shell; the middle part of the combustion furnace is provided with a combustion chamber and a furnace end mounting hole, the furnace end mounting hole is communicated with the combustion chamber, and the combustion chamber is also communicated with the waste gas chamber; the upper surface of the inner shell is gradually increased from a position close to the furnace end mounting hole to a position close to the outer shell, and the inner shell comprises an inner heat insulation layer; the hearth and the combustion furnace have high heat utilization rate and less heat radiation after being stopped using.

Description

Hearth and combustion furnace

Technical Field

The invention relates to the field of hearths, in particular to a hearth and a combustion furnace.

Background

Now, no matter the kitchen is fried to the tradition or novel stir-fry the kitchen, most still adopt open type furnace ring design, and these furnaces can't discharge fume through the mode of discharging fume of reserving smoke exhaust channel. In addition, although some novel frying furnaces are provided with smoke outlets in the hearth, a remedial measure of discharging smoke at the opening of the furnace ring is adopted due to the fact that the using effect is not obvious or technical factors exist. Whichever open type smoke exhaust structure is adopted, the biggest disadvantage is that one third or more of the total heat of the hearth is lost. Certainly, many novel frying furnaces adopt a closed hearth design, and the technical problem of smoke exhaust in the hearth is well solved. However, the heat utilization rate of the existing closed type hearth is still not high, because the hearth itself absorbs a large amount of heat, and after the hearth is used, the heat is still continuously radiated outwards, so that the ambient temperature is increased.

Disclosure of Invention

Accordingly, it is necessary to provide a furnace and a combustion furnace which have high heat utilization efficiency and have less heat radiation after being stopped.

The embodiment of the invention provides a hearth, which comprises an outer shell and an inner shell, wherein the upper part of the inner shell is connected with the outer shell, the lower part of the inner shell is also connected with the outer shell, and a waste gas cavity is formed between the inner shell and the outer shell; the middle part of the combustion furnace is provided with a combustion chamber and a furnace end mounting hole, the furnace end mounting hole is communicated with the combustion chamber, and the combustion chamber is also communicated with the waste gas chamber; the inner shell is gradually increased from a position close to the furnace end mounting hole to a position close to the outer shell, and the inner shell comprises an inner heat insulation layer.

Preferably, the inner casing further comprises a radiation layer fixed on the inner heat insulation layer and positioned at one side of the combustion chamber.

Preferably, the radiation layer is made of a silicon carbide material layer or high-temperature resistant far infrared radiation paint, and the thickness of the radiation layer is 0.5-2 mm.

Preferably, the shell comprises an outer heat insulation layer, a furnace edge is arranged on the upper portion of the shell, the furnace edge is annular and completely surrounds the furnace edge, the upper surface of the furnace edge inclines downwards from outside to inside, and a fire observation hole is formed in the furnace edge.

Preferably, a heat exchange pipe is arranged in the waste gas cavity, and a gap is formed between the heat exchange pipe and the waste gas cavity.

Preferably, fins are arranged on the outer surface of the heat exchange tube; the heat exchange pipe is a heat exchange air pipe and/or a heat exchange water pipe; the water inlet and the water outlet of the heat exchange water pipe are opposite to the air inlet and the air outlet of the heat exchange air pipe.

Preferably, the inner shell is further provided with an after-fire backflow hole, the after-fire backflow hole is communicated with the waste gas cavity, and the waste gas cavity is communicated with the waste gas cavity through the after-fire backflow hole; the bottom of the shell is provided with a smoke exhaust hole which is also communicated with the waste gas cavity;

the residual fire return holes are arranged in a plurality, and the residual fire return holes and the smoke exhaust holes are arranged oppositely; alternatively, the first and second electrodes may be,

the excess fire backward flow hole is provided with a plurality ofly, and is a plurality of excess fire backward flow hole encircles furnace end mounting hole a week.

Preferably, a heat exchange tube is arranged in the waste gas cavity, and the inlet of the heat exchange tube and the outlet of the heat exchange tube are positioned between the smoke exhaust hole and the residual fire backflow hole.

Preferably, the outer shell comprises a fixed shell, an outer heat insulation layer is arranged inside the fixed shell, and the outer heat insulation layer and the inner heat insulation layer comprise one or more of aluminum silicate, vermiculite and pearl wool materials.

The invention also provides a combustion furnace, which comprises a combustion furnace body and the hearth of any one of the combustion furnaces, wherein the combustion furnace body comprises a furnace end, and the furnace end penetrates through the furnace end mounting hole.

The hearth of the invention is provided with the inner shell and the outer shell, the inner shell is provided with the heat insulating layer, so that the heat in the combustion cavity is reduced to be conducted to the heat exchange cavity, the heat is absorbed by the heating pot at the upper part of the combustion cavity as much as possible, and the heat utilization rate is improved; in addition, the heat insulation layer absorbs little heat, and after combustion is stopped, heat radiation to the outside is little.

Drawings

The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the principles of the invention.

FIG. 1 is a top view of a furnace according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the furnace AA of the preferred embodiment of the present invention;

FIG. 3 is a cross-sectional view of a furnace in the direction of BB according to a preferred embodiment of the present invention;

FIG. 4 is a top view of a firebox of an embodiment of the present invention with the inner shell removed;

FIG. 5 is a top view of a furnace according to another preferred embodiment of the present invention;

FIG. 6 is a sectional view of a furnace XX according to another preferred embodiment of the present invention;

FIG. 7 is a cross-sectional view in the YY direction of a furnace according to another preferred embodiment of the present invention;

FIG. 8 is a top view of a firebox of another embodiment of the invention with the inner shell removed;

fig. 9 is a front view of a burner according to a preferred embodiment of the present invention.

In the figure: 1. a housing; 11. a stationary housing; 12. an outer insulating layer; 2. an inner shell; 21. an inner insulating layer; 22. a radiation layer; 3. an exhaust gas chamber; 4. a furnace end mounting hole; 5. furnace edge; 6. a heat exchange pipe; 601. an inlet of the heat exchange tube; 602. an outlet of the heat exchange tube; 61. a fin; 62. a heat exchange gas pipe; 621. an air inlet; 622. an air outlet; 63. a heat exchange water pipe; 631. a water inlet; 632. a water outlet; 7. a flash back flow hole; 8. a smoke vent; 9. a combustion chamber; 10. cooking; 11, a fan; 12. a premix valve; 13. a furnace end.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 9, an embodiment of the present invention provides a furnace including an outer shell 1 and an inner shell 2, an upper portion of the inner shell 2 is connected to the outer shell 21, a lower portion of the inner shell 2 is also connected to the outer shell 21, and an exhaust gas chamber 3 is formed between the inner shell 2 and the outer shell 21. The middle part of the combustion furnace is provided with a combustion chamber 9 and a furnace end mounting hole 4, the furnace end mounting hole 4 is communicated with the combustion chamber 9, and the combustion chamber 9 is also communicated with the waste gas chamber 3. During the use, furnace end 13 runs through furnace end mounting hole 4, burns in burning chamber 9, and the cigarette and the after fire that the burning produced enter into waste gas chamber 3 in, and cigarette and after fire carry out the heat transfer in waste gas chamber 3. The upper surface of the inner casing 2 is gradually raised from a position near the burner mounting hole 4 to a position near the outer casing 21, so that the combustion chamber 9 is deepest at a position near the burner mounting hole 4 and becomes gradually shallower from the burner mounting hole 4 toward the edge. The inner shell 2 comprises an inner heat insulation layer 21, and the inner heat insulation layer 21 comprises one or more of heat insulation materials such as aluminum silicate (Al2SiO5), vermiculite, pearl wool and the like. Vermiculite is a natural, inorganic, non-toxic mineral substance, which expands under the action of high temperature. It is a rare mineral and belongs to silicate. Its crystal structure is monoclinic, and looks like mica in its appearance. The polyethylene foam is a non-crosslinked closed cell structure, also called EPE pearl cotton, and is formed by countless independent bubbles generated by physically foaming low-density polyethylene resin. Overcomes the defects of easy breakage, deformation and poor restorability of common foaming glue. The material has the advantages of water resistance, moisture resistance, shock resistance, sound insulation, heat preservation, good plasticity, strong toughness, cyclic reconstruction, environmental protection, strong impact resistance and the like, and also has good chemical resistance. In practical application, the hearth is generally used for frying Chinese dishes in restaurants or restaurants, the bottom of a pot 10 for frying the dishes is provided with a flat bottom and an arc-shaped bottom, when the pot 10 with the arc-shaped bottom is used, a part of the bottom of the pot 10 can penetrate into the combustion chamber 9, the inner shell 2 forms a recess in the middle of the inner shell in order to adapt to the shape of the pot 10, and the recess also belongs to the combustion chamber 9.

In a preferred embodiment, the inner shell 2 further comprises a radiant layer 22, the radiant layer 22 being fixed to the inner insulating layer 21 and located on the side of the combustion chamber 9. During combustion, the radiant layer 22 also absorbs a portion of the heat and quickly radiates infrared heat away, which is then absorbed by the pan 10 to be heated. The radiation layer 22 is fixed to the inner insulation layer 21, i.e. the radiation layer 22 is also arranged obliquely like the inner insulation layer 21.

In a preferred embodiment, the radiation layer 22 is made of a layer of silicon carbide (SiC) material or a high temperature resistant far infrared radiation paint. Specifically, the high-temperature resistant far infrared radiation coating can be a solid solution formed by mixing transition group element oxides, manganese dioxide, ferric trioxide, silicate refractory materials and other materials at high temperature. The thickness of the radiation layer 22 is 0.5-2 mm. In particular, the thickness of the radiation layer 22 is 0.6mm or 0.8mm or 1.0mm or 1.2mm or 1.3mm or 1.4mm or 1.5mm or 1.7mm or 1.9 mm. Multiple tests and practices prove that the heat preservation effect and the radiation effect of the inner shell 2 comprehensively reach the optimal standard when the thickness of the radiation layer 22 is 1.2 mm.

In a preferred embodiment, the outer shell 21 comprises a fixed shell 11, an outer heat insulation layer 12 is arranged inside the fixed shell 11, the outer heat insulation layer 12 also comprises one or more of heat insulation materials such as aluminum silicate (Al2SiO5), vermiculite, pearl wool and the like, a furnace edge 5 is arranged on the upper portion of the outer shell 21, the furnace edge 5 is in a ring shape and completely surrounds the furnace edge 5, and the completely surrounding furnace edge 5 means that when the pot 10 is placed on the combustion furnace, the furnace edge 5 is in contact with the bottom of the pot 10, so that smoke and fire in the combustion chamber 9 can not or can hardly escape to the outside from between the furnace edge 5 and the bottom of the pot 10. The upper surface of the furnace edge 5 inclines downwards from outside to inside, and the furnace edge 5 is provided with a fire observation hole. Specifically, at least two convex edges are arranged on the furnace edge 5, and fire observation holes are formed between the convex edges. The outer casing 21 may comprise only the outer insulating layer 12 and may also comprise other components, and the arrangement of the outer insulating layer 12 further reduces the loss of heat and reduces the heat radiation of the furnace to the surrounding space.

In a preferred embodiment, a heat exchange tube 6 is disposed within the exhaust gas chamber 3, and a gap is formed between the heat exchange tube 6 and the exhaust gas chamber 3. The heat exchange pipe 6 is heated by smoke and remaining fire which enter the exhaust gas chamber 3 from the combustion chamber 9, and the heat is absorbed by the flowing heat exchange medium in the heat exchange pipe 6, thereby reducing the temperature in the exhaust gas chamber 3.

In the preferred embodiment, the heat exchange tubes 6 are provided with fins 61 on the outer surface thereof; the heat exchange pipe 6 is a heat exchange air pipe 62 and/or a heat exchange water pipe 63. In an embodiment, the heat exchange tube 6 is a heat exchange air tube 62, due to the blowing action of the fan 11, air enters the air inlet 621 of the heat exchange air tube 62, the air is heated up after heat exchange in the waste gas cavity 3, the heated air comes out from the air outlet 622 and then enters the premixing valve 12 of the burner 13 to be mixed with gas, and then enters the combustion cavity 9 for combustion, and the heated air brings heat into the combustion cavity 9 for recycling of the heat. In another embodiment, the heat exchanging pipe 6 is a heat exchanging water pipe 63, water enters from a water inlet 631 of the heat exchanging water pipe 63, the water is heated after heat exchange when flowing through the exhaust gas chamber 3, the heated water comes out from a water outlet 632 of the heat exchanging water pipe 63, and the heated water can be reused. In other embodiments, the heat exchange gas pipe 62 and the heat exchange water pipe 63 in the above two embodiments exist at the same time, and participate in heat exchange. The water inlet 631 and the water outlet 632 of the heat exchange water pipe 63 are adjacently arranged, the air inlet 621 and the air outlet 622 of the heat exchange air pipe 62 are adjacently arranged, and the water inlet 631 and the water outlet 632 of the heat exchange water pipe 63, the air inlet 621 and the air outlet 622 of the heat exchange air pipe 62 are oppositely arranged.

In the preferred embodiment, the inner shell 2 is further provided with an after-fire return hole 7, the after-fire return hole 7 is communicated with the exhaust gas cavity 3, and the combustion cavity 9 is communicated with the exhaust gas cavity 3 through the after-fire return hole 7. The bottom of the shell 21 is provided with a smoke exhaust hole 8, and the smoke exhaust hole 8 is also communicated with the waste gas cavity 3 and used for exhausting smoke generated by combustion. The excess fire backflow holes 7 are arranged in a plurality of numbers, the excess fire backflow holes 7 and the smoke exhaust holes 8 are arranged oppositely, a connecting line of the middle portions of the excess fire backflow holes 7 and the middle portions of the smoke exhaust holes 8 passes through or is close to the center of the furnace end mounting hole 4, the middle portions of the excess fire backflow holes 7 refer to the center of the whole excess fire backflow holes 7, and the center of each excess fire backflow hole 7 is not. Specifically, the plurality of ember recirculation holes 7 are provided around the burner mounting hole 4, and the plurality of ember recirculation holes 7 occupy an arc of 180 °. Because the smoke exhaust holes 8 can generate a force, the fire near the smoke exhaust holes 8 is stronger, and the bottom of the whole pot 10 is heated unevenly. According to the invention, the residual fire return holes 7 and the smoke exhaust holes 8 are oppositely arranged, and the residual fire return holes 7 are arranged in a plurality, so that the influence of the smoke exhaust holes 8 is dispersed, and the pot 10 is heated more uniformly. In addition, the structure also enables the residual fire and smoke to flow in the heat exchange cavity for a longer time, and the heat exchange is more sufficient. In another embodiment, the ember return holes 7 are provided in plurality, and the plurality of ember return holes 7 surround the burner mounting hole 4 for one circle.

In the preferred embodiment, a heat exchange tube 6 is disposed within the flue gas chamber 3, with the inlet and outlet of the heat exchange tube 6 being located between the smoke vent 8 and the ember return 7. Specifically, if the heat exchange pipe 6 includes two, for example, one heat exchange water pipe 63 and one heat exchange air pipe 62, the inlet and outlet positions of the heat exchange water pipe 63 and the heat exchange air pipe 62 are also symmetrically arranged. Namely, the inlet and outlet positions of the heat exchange water pipe 63 and the heat exchange air pipe 62, the surplus fire return holes 7 and the smoke discharge holes 8 are arranged at intervals around the burner mounting hole 4, and are approximately 90 ° apart.

The hearth of the invention is provided with the inner shell 2 and the outer shell 1, the inner heat insulation layer 21 is arranged on the inner shell 2, the heat in the combustion chamber 9 is reduced to be conducted to the heat exchange chamber, the heat is absorbed by the heating pot on the upper part of the combustion chamber 9 as much as possible, the heat utilization rate is improved and can reach 45-50 percent, and compared with the existing utilization rate of about 30 percent, a large amount of energy can be saved; in addition, the heat insulation layer absorbs little heat, and after combustion is stopped, heat radiation to the outside is little.

Experiment of heat utilization

Subject:

comparative example: the hearth comprises an inner shell 2 and an outer shell 1, wherein both the inner shell 5 and the outer shell 4 are made of cast iron, a waste gas cavity 3 is arranged between the inner shell 2 and the outer shell 1, and a heat exchange pipe 6 is not arranged in the waste gas cavity 3.

The first experimental example: the hearth comprises an inner shell 2 and an outer shell 1, wherein the outer shell 1 is made of cast iron, the inner shell 2 comprises an inner heat insulation layer 21, but a radiation layer 22 is not arranged, a waste gas cavity 3 is arranged between the inner shell 2 and the outer shell 1, and a heat exchange pipe 6 is not arranged in the waste gas cavity 3.

Experiment example two: the hearth comprises an inner shell 2 and an outer shell 1, wherein the outer shell 1 is made of cast iron, the inner shell 2 comprises an inner heat insulation layer 21, a radiation layer 22 is arranged on the inner heat insulation layer 21, a waste gas cavity 3 is arranged between the inner shell 2 and the outer shell 1, and a heat exchange tube 6 is not arranged in the waste gas cavity 3.

Experiment example three: the hearth comprises an inner shell 2 and an outer shell 1, wherein the inner shell 2 is made of cast iron, the outer shell 1 comprises an outer heat insulation layer 21, a waste gas cavity 3 is arranged between the inner shell 2 and the outer shell 1, and a heat exchange pipe 6 is not arranged in the waste gas cavity 3.

Experimental example four: the hearth comprises an inner shell 2 and an outer shell 1, wherein the inner shell 2 comprises an inner heat insulation layer 21, a radiation layer 22 is arranged on the inner heat insulation layer 21, the outer shell 1 comprises an outer heat insulation layer 12, a waste gas cavity 3 is arranged between the inner shell 2 and the outer shell 1, and a heat exchange tube 6 is not arranged in the waste gas cavity 3.

Experimental example five: the hearth comprises an inner shell 2 and an outer shell 1, wherein the inner shell 2 comprises an inner heat insulation layer 21, a radiation layer 22 is arranged on the inner heat insulation layer 21, the outer shell 1 comprises an outer heat insulation layer 12, a waste gas cavity 3 is arranged between the inner shell 2 and the outer shell 1, and a heat exchange pipe 6 is arranged in the waste gas cavity 3.

The seven hearths are mounted on the same burner 13, and the experiment is carried out according to the experiment method of the CJ/T28-2003 Chinese meal gas stir-frying cover, and the following results are obtained.

The specific experimental data are as follows:

as can be seen from the above table, the furnace heat efficiencies become larger in the order from the comparative example to the experimental example V. The temperature of the tail gas of the hearth using the heat exchange tube 6 is obviously lower, which shows that the heat of the tail gas is partially recycled. Therefore, the hearth of the invention has higher heat utilization rate than the existing hearth, can save fuel, has less heat absorption capacity due to the use of the heat insulation layer, has less heat radiated to the outside after the combustion is stopped, has less temperature rise in the environment near the hearth, and is more comfortable.

Referring to fig. 9, the present invention further provides a combustion furnace, which includes a combustion furnace body and any one of the above hearths, wherein the combustion furnace body includes a burner 13, the burner 13 penetrates through the burner mounting hole 4, and the burner 13 burns in the combustion chamber 9.

In a preferred embodiment, the furnace head is a premix burner head. The combustion furnace comprises a premixing valve 12 and a fan 11, wherein the fan 11 blows air into a heat exchange tube 6, the temperature of the air is increased after heat exchange, the air enters the premixing valve 12, fuel gas and the heated air are connected with an air inlet 621 of the premixing valve 12, an air outlet 622 of the premixing valve 12 is connected with a furnace end, the premixing valve 12 transmits the premixed fuel gas to the furnace end 13, and the premixed fuel gas is combusted in a combustion chamber 9.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, reference to the description of the terms "preferred embodiment," "yet another embodiment," "other embodiments," or "specific examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (10)

1. A hearth is characterized by comprising an outer shell and an inner shell, wherein the upper part of the inner shell is connected with the outer shell, the lower part of the inner shell is also connected with the outer shell, and a waste gas cavity is formed between the inner shell and the outer shell; the middle part of the combustion furnace is provided with a combustion chamber and a furnace end mounting hole, the furnace end mounting hole is communicated with the combustion chamber, and the combustion chamber is also communicated with the waste gas chamber; the upper surface of the inner shell is gradually increased from a position close to the furnace end mounting hole to a position close to the outer shell, and the inner shell comprises an inner heat insulation layer.

2. The furnace of claim 1, wherein the inner shell further comprises a radiant layer secured to the inner insulating layer and positioned to one side of the combustion chamber.

3. The burner of claim 1, wherein the radiant layer is made of a silicon carbide material layer or a high temperature resistant far infrared radiation paint, and the thickness of the radiant layer is 0.5 to 2 mm.

4. The hearth according to claim 1, characterized in that the shell comprises an outer heat insulation layer, a furnace edge is arranged at the upper part of the shell, the furnace edge is annular and completely surrounds the furnace edge, the upper surface of the furnace edge is inclined downwards from outside to inside, and a fire observation hole is arranged on the furnace edge.

5. The furnace of claim 1, wherein a heat exchange tube is disposed in the exhaust gas chamber, and a gap is formed between the heat exchange tube and the exhaust gas chamber.

6. The furnace of claim 5, wherein the heat exchange tubes are provided with fins on the outer surface; the heat exchange pipe is a heat exchange air pipe and/or a heat exchange water pipe; the water inlet and the water outlet of the heat exchange water pipe are opposite to the air inlet and the air outlet of the heat exchange air pipe.

7. The hearth according to claim 1, wherein the inner shell is further provided with an after-fire backflow hole, the after-fire backflow hole is communicated with the exhaust gas cavity, and the exhaust gas cavity is communicated with the exhaust gas cavity through the after-fire backflow hole; the bottom of the shell is provided with a smoke exhaust hole which is also communicated with the waste gas cavity;

the residual fire return holes are arranged in a plurality, and the residual fire return holes and the smoke exhaust holes are arranged oppositely; alternatively, the first and second electrodes may be,

the excess fire backward flow hole is provided with a plurality ofly, and is a plurality of excess fire backward flow hole encircles furnace end mounting hole a week.

8. The furnace of claim 7, wherein a heat exchange tube is disposed in the exhaust gas chamber, and the heat exchange tube inlet and the heat exchange tube outlet are located between the smoke exhaust hole and the ember return hole.

9. The hearth of claim 7, wherein the outer shell comprises a fixed shell, an outer heat insulation layer is arranged inside the fixed shell, and the outer heat insulation layer and the inner heat insulation layer comprise one or more of aluminum silicate, vermiculite and pearl wool materials.

10. A burner comprising a burner body and the firebox of any one of claims 1 to 9, wherein the burner body includes a burner head, and the burner head extends through the burner mounting hole.

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