CN112240577A - Waste heat recovery device and combustion furnace - Google Patents

Abstract

The invention provides a waste heat recovery device and a combustion furnace. The waste heat recovery device includes a heat exchange component, a heat storage component and a heat exchange medium, and the heat storage component and the heat exchange component are all located in the heat exchange medium; The heat exchange assembly includes a heat exchange pipe, and the heat exchange pipe is arranged in a curved shape, and the two ends of the heat exchange pipe are respectively provided with a heat exchange inlet and a heat exchange outlet, and the heat exchange inlet and the heat exchange outlet are connected from each other. the heat exchange medium is exposed; the heat storage assembly includes a heat storage pipe, the heat storage pipe is provided with a heat storage inlet and a heat storage outlet, and the heat storage inlet and the heat storage outlet are also exposed from the heat exchange medium; the Waste heat recovery device and combustion furnace A waste heat recovery device and combustion furnace capable of collecting waste heat.

Description

A waste heat recovery device and combustion furnace

technical field

The invention relates to the technical field of stoves, in particular to a waste heat recovery device and a combustion furnace.

Background technique

In recent years, natural gas (including pipeline natural gas, liquefied natural gas, compressed natural gas, petroleum liquefied gas and other gas fuels) has been rapidly popularized and used. Because it is easy to use, clean and hygienic, and can meet the habit of Chinese cooking requiring high temperature firepower, gas stoves are widely used in gas stoves. The canteens of colleges and technical schools, various hotels, hospitals, public canteens of government agencies, enterprises and institutions have been put into use in large quantities, but the actual utilization rate of these stoves is less than 35% (less than 25% for frying stoves, and no more than 25% for cooking stoves). to 40%). Many stoves, especially in larger stoves such as canteen stoves, are equipped with flue gas channels to discharge the exhaust gas generated by the combustion of the flame in the stove. This part of the exhaust gas contains a lot of heat but is directly discharged into the atmosphere, thus causing energy loss. waste. At present, there are some devices that can recover waste heat, such as using waste heat to heat water to form warm water for people to use. However, due to the uncertainty of the amount of waste heat generated, the time of generation is relatively scattered, so the value of waste heat recovery and utilization is not high.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a waste heat recovery device and a combustion furnace capable of collecting waste heat.

The invention provides a waste heat recovery device, which is characterized in that it includes a heat exchange component, a heat storage component and a heat storage device, the heat storage device includes a heat exchange medium, and the heat storage component and the heat exchange component are both located in the The heat exchange component includes a heat exchange pipe, and both ends of the heat exchange pipe are respectively provided with a heat exchange inlet and a heat exchange outlet, and the heat exchange inlet and the heat exchange outlet extend from the heat exchange pipe. The heat medium is exposed; the heat storage assembly includes a heat storage pipe, the heat storage pipe is provided with a heat storage inlet and a heat storage outlet, and the heat storage inlet and the heat storage outlet are also exposed from the heat exchange medium.

Preferably, both ends of the heat exchange pipe are respectively provided with a heat inlet cavity and a heat outlet cavity, the heat inlet cavity is communicated with the heat exchange inlet, and the heat outlet cavity is communicated with the heat exchange outlet.

Preferably, a plurality of the heat exchange pipes are provided, and the plurality of the heat exchange pipes are respectively communicated with the heat inlet cavity and the heat outlet cavity; the heat storage pipes are in the shape of a loop, and a plurality of the heat exchange pipes Set close to the heat storage pipe.

Preferably, the heat storage device further includes a medium accommodating box, the heat exchange component and the heat storage component are arranged in the medium accommodating box, and the heat exchange medium is filled in the medium accommodating box; A heat inlet and the heat storage outlet protrude from the medium containing box.

Preferably, the heat exchange pipes are provided with heat exchange fins; the heat storage pipes are also provided with heat storage fins.

The present invention also provides a combustion furnace, including a combustion furnace body and the waste heat recovery device according to the above claims 1-5, the combustion furnace body is provided with an exhaust gas discharge pipe, and the exhaust gas discharge pipe is connected to the waste recovery device. connected.

Preferably, the burner body includes a first burner body and a second burner body; the heat exchange assembly includes a first heat exchange assembly and a second heat exchange assembly, and the heat storage assembly is disposed on the first burner body between the heat exchange assembly and the second heat exchange assembly; the heat exchange inlet of the first heat exchange assembly is communicated with the exhaust gas discharge pipe of the first combustion furnace body, and the heat exchange inlet of the second heat exchange assembly is connected to The exhaust gas discharge pipes of the second combustion furnace body are communicated with each other.

Preferably, the combustion furnace is further provided with a first smoke exhaust channel and a second smoke exhaust channel, the first smoke exhaust channel is arranged close to the second combustion furnace body, and the second smoke exhaust channel is located close to the first smoke exhaust channel. A burner body is provided; the heat exchange outlet of the first heat exchange component is communicated with the first smoke exhaust channel, and the heat exchange outlet of the second heat exchange component is communicated with the second smoke exhaust channel.

Preferably, the combustion furnace includes a furnace, the furnace includes 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, the inner shell and the inner shell are connected with the outer shell. A waste gas cavity is formed between the shells; a combustion cavity and a burner head mounting hole are arranged in the middle of the burner, the burner head installation hole is communicated with the burner cavity, and the burner cavity is also connected with the waste gas cavity The upper surface of the inner shell is gradually raised from a position close to the furnace head installation hole to a position close to the outer shell, and the inner shell includes an inner heat insulation layer; the inner shell also includes a radiation layer, so The radiation layer is fixed on the inner heat insulation layer and is located on one side of the combustion chamber; the radiation layer is made of a silicon carbide material layer, and the thickness of the radiation layer is 0.5-2 mm.

Preferably, the inner shell is further provided with a residual fire return hole, the residual fire return hole is communicated with the exhaust gas cavity, and the exhaust gas cavity is communicated with the exhaust gas cavity through the residual fire return hole;

There are a plurality of afterburner return holes, and the plurality of afterburner return holes and the smoke exhaust passage are arranged opposite to each other; or,

There are a plurality of afterburner return holes, and the plurality of afterburner return holes surround the burner head mounting hole.

The present invention is provided with a heat exchange component, a heat outlet component and a heat exchange medium. The heat exchange component collects the heat in the cooking exhaust gas to the heat exchange component and transfers and stores it to the heat storage component through the heat exchange medium. The geothermal heat can be collected, which solves the problems caused by the uncertainty of the amount of waste heat generated and the relatively scattered time of generation, and makes the utilization value of waste heat higher.

Description of drawings

The above and other objects, features and advantages of the present invention will become more apparent from a more detailed description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals refer to the same parts throughout the drawings, and the drawings have not been intentionally drawn to scale, the emphasis being placed on illustrating the subject matter of the present invention.

1 is a front view of a waste heat recovery device and a combustion furnace according to a preferred embodiment of the present invention;

2 is a side view of a waste heat recovery device and a combustion furnace according to a preferred embodiment of the present invention;

3 is a schematic diagram of the overall structure of the furnace according to the preferred embodiment of the present invention;

Fig. 4 is the sectional view on the A-A direction in Fig. 1;

Fig. 5 is a sectional view in the direction B-B in Fig. 1;

Fig. 6 is the sectional view on the C-C direction in Fig. 1;

Fig. 7 is the sectional view on D-D direction in Fig. 1;

FIG. 8 is a cross-sectional view in the direction E-E in FIG. 1 .

In the figure: 1, heat exchange component; 11, heat exchange pipe; 111, heat exchange inlet; 112, heat exchange outlet; 113, heat exchange fin; 12, first heat exchange component; 13, second heat exchange component; 2. Heat storage component; 21. Heat storage pipe; 211, Heat storage inlet; 212, Heat storage outlet; 213, Heat inlet cavity; 214, Heat outlet cavity; 215, Heat storage fins; 3, Heat exchange medium; 31 4, the first combustion furnace body; 41, the second smoke exhaust channel; 5, the second combustion furnace body; 51, the first smoke exhaust channel; 6, the furnace chamber; 62, inner shell; 621, inner heat insulation layer; 622, radiation layer; 633, residual fire return hole; 7, combustion chamber; 71, furnace head installation hole.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings.

It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to and integrated with the other element, or intervening elements may also be present. The terms "installed," "one end," "the other end," and similar expressions used herein are for illustrative purposes only.

Unless otherwise defined, 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 specification herein is for the purpose of describing specific embodiments only and is not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in FIGS. 1-8 , the present invention provides a waste heat recovery device, which includes a heat exchange component 1 , a heat storage component 2 and a heat storage device, and the heat storage device includes a heat exchange medium 3 , a heat storage component 2 and a heat exchange component 1 . All are located in the heat exchange medium 3, and the heat exchange medium 3 may be a solid phase change material or a liquid phase change material or cement or inorganic salt. Specifically, the heat storage material is pebbles or concrete or molten salt or oil. Among them, the cost per kWh of concrete heat storage material is the lowest among all storage materials, which is equivalent to 27% of nitrate, 3% of cast iron, and 1.7% of cast steel. Concrete has a higher thermal conductivity than nitrates. In the preferred embodiment, cement is selected as the heat exchange medium 3 . The heat exchange assembly 1 includes a heat exchange pipe 11. The two ends of the heat exchange pipe 11 are respectively provided with a heat exchange inlet 111 and a heat exchange outlet 112. The heat exchange inlet 111 and the heat exchange outlet 112 are exposed from the heat exchange medium 3. can be observed, can be protruded from the heat exchange medium 3, or can be observed in the heat exchange medium 3. In another embodiment, the heat exchange inlet 111 and the heat exchange outlet 112; the heat storage assembly 2 includes a heat storage pipe 21, and the heat storage pipe 21 is provided with a heat storage inlet 211 and a heat storage outlet 212, and a heat storage inlet 211 and a heat storage outlet 212 is also exposed from the heat exchange medium 3 , where exposed means that it can be observed, it may be protruding from the heat exchange medium 3 , or it may be observed within the heat exchange medium 3 . The exhaust gas enters the heat exchange component 1 from the heat exchange inlet 111, the heat exchange component 1 absorbs the heat in the exhaust gas, and the medium absorbs the heat on the heat exchange component 1 and stores it and transfers it to the heat storage component 2. The heat storage component 2 is provided with The heat storage pipe 21, the medium water can be passed into the heat storage pipe 21, and the heat on the heat storage component 2 heats the medium water to convert the medium water into steam for various purposes.

In a preferred embodiment, both ends of the heat exchange pipe 11 are respectively provided with a heat inlet cavity 213 and a heat outlet cavity 214 .

In a preferred embodiment, a plurality of heat storage pipes 21 are provided, and a plurality of heat exchange pipes 11 are provided. The heat cavity 213 is communicated with the heat outlet cavity 214 ; the heat storage pipe 21 is in the shape of a loop, and one end of the heat storage pipe 21 is the heat storage inlet 211 . The other end of the heat storage pipe 21 is a heat storage outlet 212 , the heat storage inlet 211 is connected to water, and the heat storage outlet 212 is used to connect other power equipment. The heat storage pipe 21 is arranged in a return shape in order to lengthen the heating length of the heat storage pipe 21, and the heat storage pipe 21 uses the stored heat to heat water into steam.

In a preferred embodiment, the heat storage device further includes a medium containing box 31 to allow the medium to accumulate. The heat exchange assembly 1 and the heat storage assembly 2 are arranged in the medium containing box 31 , and the heat exchange medium 3 is filled in the medium containing box 31 ; the heat storage inlet 211 and the heat storage outlet protrude from the medium containing box 31 . When cement is used as the heat exchange medium 3, the heat storage assembly 2 and the heat exchange assembly 1 are fixed in the cement.

In a preferred embodiment, heat exchange fins 113 are provided on the heat exchange pipe 11, and the fins are spirally arranged along the axis of the heat exchange pipe 11; The heat pipe 21 is spirally arranged in the axial direction, and the heat exchange fins 113 are used to increase the area of the pipe for heat exchange.

The present invention also provides a combustion furnace, comprising a combustion furnace body and the above-mentioned waste heat recovery device. The combustion furnace body is provided with an exhaust gas discharge pipe, the waste gas discharge pipe is communicated with the waste heat recovery device, and one end of the waste gas discharge pipe is communicated with the waste gas cavity. , the other end of the exhaust gas discharge pipe is connected with the waste heat recovery device.

In a preferred embodiment, the combustion furnace body includes a first combustion furnace body 4 and a second combustion furnace body 5, and the first combustion furnace body 4 is symmetrically arranged on the second combustion furnace body 5; the heat exchange component 1 includes a first heat exchange component 12 and the second heat exchange assembly 13, the heat storage assembly 2 is arranged between the first heat exchange assembly 1 and the second heat exchange assembly 1; the heat exchange inlet 111 of the first heat exchange assembly The exhaust gas discharge pipeline is connected, and the heat exchange inlet 111 of the second heat exchange component 13 is connected with the exhaust gas discharge pipeline of the second combustion furnace body 5 .

In a preferred embodiment, the combustion furnace is further provided with a first smoke exhaust channel 51 and a second smoke exhaust channel 41 , the first smoke exhaust channel 51 is arranged close to the second combustion furnace body 5 , and the second smoke exhaust channel 41 is located close to the first combustion furnace body 5 . The furnace body 4 is provided; the heat exchange outlet 112 of the first combustion furnace body 4 is communicated with the first smoke exhaust passage 51, and the heat exchange outlet 112 of the second combustion furnace body 5 is communicated with the second smoke exhaust passage 41, and the combustion furnace produces The flue gas with heat passes through the first heat exchange component 12 and the second heat exchange component 13 respectively, and the flue gas with absorbed heat is discharged through the exhaust channel to prevent the flue gas from exchanging heat in the first heat exchange component 12 and the second heat exchange component. The assembly 13 accumulates in the heat exchange pipe 11 and even blocks the heat exchange pipe 11 .

In a preferred embodiment, the combustion furnace includes a furnace 6, the furnace 6 includes an outer shell 61 and an inner shell 62, the upper part of the inner shell 62 is connected with the outer shell 61, the lower part of the inner shell 62 is also connected with the outer shell 61, the inner shell 62 and the inner shell 62 are connected with the outer shell 61. A waste gas cavity 611 is formed between the casings 61; the middle part of the combustion furnace is provided with a combustion cavity 7 and a burner head mounting hole 71, the burner head installation hole 71 is communicated with the combustion chamber 7, and the combustion chamber 7 is also communicated with the waste gas cavity 611; The upper surface of the inner shell 62 is gradually raised from a position close to the furnace head mounting hole 71 to a position close to the outer shell 61, the inner shell 62 includes an inner heat insulation layer 621, and the inner heat insulation layer 621 includes aluminum silicate (Al2SiO5), vermiculite Vermiculite is a natural, inorganic, non-toxic mineral that expands under the action of high temperature. It is a relatively rare mineral and belongs to the silicate category. Its crystal structure is monoclinic and looks like mica from its shape. Polyethylene foam is a non-crosslinked closed-cell structure, also known as EPE pearl cotton, which is composed of numerous independent bubbles produced by physical foaming of low-density polyethylene resin. It overcomes the shortcomings of ordinary foam rubber that is fragile, deformed, and has poor recovery. It has many advantages such as waterproof and moistureproof, shockproof, sound insulation, heat preservation, good plasticity, strong toughness, recycling, environmental protection, strong impact resistance, etc. It also has good chemical resistance. The inner shell 62 also includes a radiation layer 622, which is fixed on the inner heat insulation layer 621 and is located on the side of the combustion chamber 7; during the combustion process, the radiation layer 622 also absorbs a part of the heat and quickly radiates the heat Go out and be absorbed by the pot to be heated. The radiation layer 622 is made of a silicon carbide material layer, and the thickness of the radiation layer 622 is 0.5-2mm. Specifically, the thickness of the radiation layer 622 is 0.7 mm or 0.9 mm or 1 mm or 1.5 mm or 1.7 mm.

In a preferred embodiment, the inner shell 62 is also provided with a residual fire return hole 633, the residual fire return hole 633 communicates with the exhaust gas cavity 611, and the exhaust gas cavity 611 communicates with the exhaust gas cavity 611 through the residual fire return hole 633; 633 is provided with a plurality, and the plurality of residual fire return holes 633 are arranged opposite to the smoke exhaust passage; in another embodiment, the residual fire return holes 633 are provided with multiple, and the plurality of residual fire return holes 633 are installed around the burner head Hole 71 a week. Specifically, a plurality of afterglow reflow holes 633 are arranged around the burner head mounting hole 71 , and the plurality of afterglow reflow holes 633 occupy an arc of 180°.

The present invention is provided with a heat exchange component 1, a heat storage component 2 and a heat exchange medium 3. The heat exchange component 1 collects the heat in the cooking exhaust gas to the heat exchange component 1 and transfers and stores it to the heat storage component 2 through the heat exchange medium 3. Therefore, the heat generated during the cooking process can be utilized.

The technical features of the above embodiments can be combined arbitrarily. In order to simplify the description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, all It is considered to be the range described in this specification.

The above examples only represent specific embodiments of the invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. The waste heat recovery device is characterized by comprising a heat exchange assembly (1), a heat storage assembly (2) and a heat storage device, wherein the heat storage device comprises a heat exchange medium (3), and the heat storage assembly (2) and the heat exchange assembly (1) are both positioned in the heat exchange medium (3); the heat exchange assembly (1) comprises a heat exchange pipeline (11), two ends of the heat exchange pipeline (11) are respectively provided with a heat exchange inlet (111) and a heat exchange outlet (112), and the heat exchange inlet (111) and the heat exchange outlet (112) are exposed out of the heat exchange medium (3); the heat storage assembly (2) comprises a heat storage pipeline (21), the heat storage pipeline (21) is provided with a heat storage inlet (211) and a heat storage outlet (212), and the heat storage inlet (211) and the heat storage outlet (212) are also exposed out of the heat exchange medium (3).

2. The waste heat recovery device according to claim 1, wherein a heat inlet cavity (213) and a heat outlet cavity (214) are respectively disposed at two ends of the heat exchange pipeline (11), the heat inlet cavity (213) is communicated with the heat exchange inlet (111), and the heat outlet cavity (214) is communicated with the heat exchange outlet (112).

3. The waste heat recovery device according to claim 2, wherein a plurality of heat exchange pipes (11) are provided, and a plurality of heat exchange pipes (11) are respectively communicated with the heat inlet cavity (213) and the heat outlet cavity (214); the heat storage pipeline (21) is in a shape of a Chinese character 'hui', and the plurality of heat exchange pipelines (11) are arranged close to the heat storage pipeline (21).

4. The waste heat recovery device according to claim 2, wherein the heat storage device further comprises a medium accommodating box (31), the heat exchange assembly (1) and the heat storage assembly (2) are arranged in the medium accommodating box (31), and the heat exchange medium (3) is filled in the medium accommodating box (31); the heat storage inlet (211) and the heat storage outlet (212) protrude from the medium accommodating box (31).

5. The waste heat recovery device according to claim 1, wherein the heat exchange pipe (11) is provided with heat exchange fins (113); the heat storage pipeline (21) is also provided with heat storage fins (215).

6. A combustion furnace comprising a furnace body and the waste heat recovery device of any one of claims 1 to 5, wherein the furnace body is provided with a waste gas discharge duct, and the waste gas discharge duct is in communication with the waste recovery device.

7. Furnace according to claim 6, wherein the furnace body comprises a first furnace body (4) and a second furnace body (5); the heat exchange assembly (1) comprises a first heat exchange assembly (12) and a second heat exchange assembly (13), and the heat storage assembly (2) is arranged between the first heat exchange assembly (12) and the second heat exchange assembly (13); the heat exchange inlet (111) of the first heat exchange assembly (12) is communicated with the waste gas discharge pipeline of the first combustion furnace body (4), and the heat exchange inlet (111) of the second heat exchange assembly (13) is communicated with the waste gas discharge pipeline of the second combustion furnace body (5).

8. Combustion furnace according to claim 7, characterized in that it is further provided with a first smoke exhaust channel (51) arranged adjacent to the second furnace body and a second smoke exhaust channel (41) arranged adjacent to the first furnace body; the heat exchange outlet (112) of the first heat exchange assembly (13) is communicated with the first smoke exhaust channel (51), and the heat exchange outlet (112) of the second heat exchange assembly (12) is communicated with the second smoke exhaust channel (41).

9. A combustion furnace according to claim 6, comprising a furnace chamber (6), said furnace chamber (6) comprising an outer casing (61) and an inner casing (62), an upper portion of said inner casing (62) being connected to said outer casing (61), a lower portion of said inner casing (62) being also connected to said outer casing (61), said inner casing (62) and said outer casing (61) defining a flue gas chamber (611) therebetween; the middle part of the combustion furnace is provided with a combustion cavity (7) and a furnace end mounting hole (71), the furnace end mounting hole (71) is communicated with the combustion cavity (7), and the combustion cavity (7) is also communicated with the waste gas cavity (611); an upper surface of the inner casing (62) is gradually raised from a position close to the burner mounting hole (71) to a position close to the outer casing (61), and the inner casing (62) comprises an inner heat insulation layer (621); the inner shell (62) further comprises a radiation layer (622), and the radiation layer (622) is fixed on the inner heat insulation layer (621) and is positioned on one side of the combustion chamber (7); the radiation layer (622) is made of a silicon carbide material layer, and the thickness of the radiation layer (622) is 0.5-2 mm.

10. The combustion furnace as set forth in claim 9, wherein said inner casing (62) is further provided with a backfire air return hole (633), said backfire air return hole (633) communicating with said exhaust gas chamber (611), said exhaust gas chamber (611) communicating with said exhaust gas chamber (611) through said backfire air return hole (633);

the residual fire backflow holes (633) are provided in plurality, and the residual fire backflow holes (633) and the smoke exhaust channel are arranged oppositely; or,

the excess fire backward flow hole (633) is provided with a plurality of, and is a plurality of excess fire backward flow hole (633) encircles furnace end mounting hole (71) a week.

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