CN116817301A - Heat collecting device for extracting heat from waste hot gas - Google Patents

Abstract

The invention discloses a heat collecting device that absorbs heat from waste hot gas. The heat collecting device includes an air duct, a guide plate, a water tank and a heat conducting plate, wherein the air duct is a pipe extending between an air inlet and an air outlet. There is an air collecting box at a distance on the pipe where the waste hot gas is concentrated. The cross-sectional area of the pipe in the air collecting box area is larger than the cross-sectional area of the pipe at the air outlet, which can accommodate more waste hot gas; the deflector is fixed in the air duct, and the deflector is directed towards the air duct. The inner wall of the air collecting box is extended to make the waste hot gas output port of the air collecting box narrower, so that the waste hot gas can accumulate in the air collecting box and be close to the inner wall of the pipe. The water tank is installed on the air collecting box, and the side of the heat conduction plate with the cavity is attached to The outer wall of the air box and the outer wall of the water tank, and the cavity extends from the outer wall of the air box to the outer wall of the water tank. The low boiling point characteristics of the superconducting liquid can be used to quickly absorb the air box. The heat emitted increases the temperature of the heat transfer plate, and is then transferred to the water tank to heat the stored liquid.

Description

A heat collecting device that absorbs heat from waste hot gas

Technical field

The invention relates to a heat collecting device for absorbing heat from waste hot gas.

Background technique

Waste heat gas includes waste heat gas generated by combustion equipment and waste heat gas such as heat recovery when high-temperature hot air is discharged. This waste heat gas carries a large amount of heat. The common waste heat treatment methods are direct discharge or filtered discharge. The heat in the waste heat gas will be discharged from the air duct (chimney) along with the waste heat gas, resulting in a waste of heat resources.

Contents of the invention

In order to overcome the defects in the prior art, the present invention provides a heat collecting device that absorbs heat from waste hot gas to solve the problem of reusing the waste hot gas in the air duct in the prior art.

Embodiments of the present invention provide a heat collecting device for absorbing heat from waste hot gas, including:

The air duct has a duct extending between the air inlet and the air outlet. An air collecting box is provided on the duct. The duct cross-sectional area of the air collecting box is larger than the duct cross-sectional area of the air outlet and the air outlet, and The pipe located in the air collecting box can absorb and conduct the heat in the waste hot air, and a deflector is provided in the air duct;

The baffle extends toward the inner wall of the air collecting box, so that the waste heat gas is collected between the baffle and the inner wall of the air collecting box;

A water tank is installed on the air collecting box, and the body of the water tank is used to store liquid;

The heat conduction plate is provided with a hollow cavity, and the cavity is filled with superconducting liquid. The side of the heat conduction plate with the cavity is attached to the outer wall of the air box and the water tank. The outer wall of the air box extends from the outer wall of the air box to the outer wall of the water tank. The thermal conductive plate absorbs heat from the outer surface of the pipe of the air box to heat the superconducting liquid and conducts it to the water tank to heat the liquid within said water tank.

Preferably, the deflector is V-shaped, and its opening direction is toward the air outlet.

Preferably, the baffle gradually extends from the middle part of the air collecting box in a direction from the air inlet toward the air outlet and toward the inner wall of the air collecting box.

Preferably, the air collecting box and the water tank are fixed by thermally conductive glue, and the outer side walls of the air collecting box and the outer wall of the water tank are fixed by thermally conductive glue and the thermally conductive plate respectively.

Preferably, the air duct is installed at the tail of the original exhaust duct or between the air inlet end and the air outlet end of the original exhaust duct.

Preferably, a plurality of heat conducting tubes are provided on the heat conducting plate, and the cavity is formed in the heat conducting tubes.

Further, the surface of the thermal conductive plate is covered with a thermal insulation layer.

Preferably, the air duct of the air collecting box is rectangular in cross-section, and the opposite surface of the water box and the air duct is flat.

Preferably, a sewage outlet is provided on the air duct of the air collecting box, and the sewage outlet is connected to the inside of the air duct.

Preferably, there are multiple cavities, the plurality of cavities extend along a linear direction, and the cavities are sealed.

Compared with the existing technology, the present invention has the following beneficial effects: simple structure and low cost, it can accumulate heat in the waste hot air through the air collecting box in the air duct, and further concentrate the heat through the guide plate, so that the heat conductive plate can quickly It absorbs heat from the air box to activate the superconducting liquid, further increasing the temperature to quickly heat the liquid in the water tank. It can be applied to household oil fume air ducts and industrial boiler air ducts.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a front view of a heat collecting device in an embodiment of the present invention;

Figure 2 is a schematic side structural view of the heat collecting device in Figure 1;

Figure 3 is a bottom view of the structural diagram shown in Figure 2;

Figure 4 is a schematic diagram of the flow direction of the waste heat gas in the heat collecting device in the embodiment of the present invention;

Figure 5 is a schematic structural diagram of the deflector in the embodiment of the present invention;

Figure 6 is a schematic structural diagram of a thermal conductive plate in an embodiment of the present invention;

Figure 7 is a bottom view of the heat conduction plate structure in Figure 6.

Reference signs: 1. Air duct; 1. Air inlet; 12. Air outlet; 2. Deflector; 3. Water tank; 4. Heat transfer plate; 41. Groove; 42. Cavity; 5. Adhesive.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The present invention will be further described in detail below with reference to the accompanying drawings. Identical components are designated with the same reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "bottom" and "top" "Face", "inner" and "outer" refer to directions toward or away from the geometric center of a specific component respectively. In summary, the contents of this description should not be construed as limitations of the present invention.

As shown in Figures 1 to 3, an embodiment of the present invention provides a heat collecting device that absorbs heat from waste hot gas. The heat collecting device includes an air duct 1, a guide plate 2, a water tank 3 and a heat conductive plate 4. The air duct 1 is a pipe extending between the air inlet 11 and the air outlet 12. There is a certain distance on the pipe where the waste heat gas is concentrated, which is referred to as the air collecting box. The cross-sectional area of the pipe belonging to the air collecting box is larger than the cross-sectional area of the pipe at the air outlet. , the air collecting box can accommodate more waste hot air. A guide plate 2 is provided in the air duct 1. The guide plate 2 extends to the inner wall of the air collecting box, making the waste hot gas output port of the air collecting box narrower and slowing down the waste hot air. The discharge speed allows the waste heat gas to accumulate in the air collecting box and close to the inner wall of the pipe. The accumulation of waste heat gas makes the heat more concentrated. The concentration of heat can increase the temperature rise, and the rich waste heat gas can keep the heat longer; storage The water tank 3 containing liquid is installed on the surface of the air collecting box, and the connection stability between the water tank 3 and the air duct 1 is reinforced by the heat conducting plate 4. The heat conducting plate 4 is provided with a hollow and sealable cavity 42, and the cavity 42 is filled with ultra Liquid conduction (not shown), the side of the heat conduction plate 4 with the cavity 42 is attached to the outer wall of the air collecting box and the outer wall of the water tank 3, and the cavity 42 extends from the outer side of the air collecting box. The wall extends to the outer wall of the water tank 3. The low boiling point characteristics of the superconducting liquid can be used to quickly absorb heat through the air collecting box and increase the temperature of the heat conduction plate 4, and then transfer it to the water tank 3 to heat the stored liquid.

The air duct 1 can be installed at the tail of the original exhaust duct, or between the air inlet end and the air outlet end of the original exhaust duct.

In addition, as shown in Figure 3, the entire air duct 1 is divided into three sections. The first section is the air inlet section L1, the second section is the air collecting box L2, and the third section is the air outlet section L3. Among them, the pipe of the air collecting box L2 The cross-sectional area is larger than the cross-sectional area of the pipe at the air outlet, which can accommodate more waste heat gas in the pipe of the air collecting box L2, allowing the heat to be concentrated. In addition, the waste hot gas pipe of the air collecting box L2 is made of materials with good thermal conductivity, such as silver, copper, gold, aluminum, etc., or metal alloys thereof, or stainless steel or ceramic materials, which can absorb and transfer the waste heat in the pipe. The heat carried by hot air. Taking the civil air duct (flue) as an example, the temperature of the waste heat in the flue is generally 30-60 degrees. After the waste heat is concentrated in the air collecting box L2, the temperature can be further raised to 70-90 degrees.

The guide plate 2 in the air duct 1 extends to the inner wall of the pipe in the air collecting box L2, making the waste hot gas outlet of the air collecting box L2 narrow, reducing the flow speed of the waste hot gas, and increasing the residence time of the waste hot gas in the air collecting box L2. , the more waste heat gas is retained, the more heat will be in the air collecting box L2. If there is more heat, the temperature of the air collecting box L2 can also rise.

Specifically, as shown in Figure 3, one end of the deflector 2 is fixed in the middle of the pipe close to the air inlet of the air collecting box L2, and the other end of the deflector 2 gradually extends toward the exhaust outlet of the air collecting box L2 and is close to the exhaust outlet of the air collecting box L2. The inside wall of the pipe. Furthermore, the extension direction of the guide plate 2 is roughly the same as the discharge direction of the waste hot gas. Specifically, refer to the flow direction of the waste heat shown in Figure 4. When the guide plate 2 is close to the inner wall of the pipe, it will compress the accommodation space of the waste heat. As a result, the discharge speed of the waste heat gas is reduced, and a large amount of waste heat gas will be retained in the air collecting box L2, and the heat will gradually increase with the increase of the waste heat gas.

Further, as shown in Figure 3, the baffle 2 is configured in a V-shape. The V-shaped baffle 2 includes a head and an opening. The head is fixed at the middle position in the pipe, and the air collecting box L2 is Divided into two areas, the inner wall of the pipe and the guide plate 2 in each area are close to the heat conduction plate 4 of the water tank; the opening direction of the opening of the guide plate 2 is roughly consistent with the flow direction of the waste heat, that is, the plate at the opening The body plate extends close to the inner wall of the pipe, gradually reducing the flow space of the waste heat gas, allowing a large amount of waste heat gas to stay in the air collecting box L2.

The direction of the hollow arrow shown in Figure 4 is the flow direction of the waste heat gas. The waste heat gas with heat enters from the air inlet 11 of the heat collecting device. After passing through the air collecting box L2, the waste heat gas will pass through the air outlet 12 of the air duct 1 of the heat collecting device. discharge. It can be seen that when the waste heat gas passes through the air duct 1 of the air collection box L2, the guide plate 2 will guide the waste heat gas closer to the inner wall of the air duct 1. Due to the expansion of the space of the air duct 1 of the air collection box L2, the flow speed of the waste heat gas will slow down. , in the area where the guide plate 2 is closer to the inner wall of the air duct 1, the waste heat gas is more concentrated. When the waste heat gas is concentrated, the heat will be concentrated and absorbed by the wall of the air duct 1 and transferred to the heat conduction plate 4, and then by the heat conduction plate 4 is passed to tank 3.

A plurality of water outlet nozzles connected to the water tank 3 are also provided in the air collecting box L2. The water outlet nozzles are installed at the corners of the box and spray to the guide plate 2 in a scattering manner. The water inlet end of each water outlet nozzle is connected to the water source. Connected. There is a sewage outlet 13 at the bottom of the box that is connected to the inside of the box. The liquid sprayed by the water outlet nozzle will clean the stains attached to the guide plate 2, and the liquid mixed with stains will drip on the bottom of the air collecting box L2. The stains can be discharged from the sewage outlet to avoid excessive accumulation of stains in the waste heat gas pipeline 1 of the air collecting box L2 and affecting the safety of the waste heat gas pipeline 1 . Specifically, a plurality of water outlet nozzles facing the baffle 2 are provided in the box of the air collecting box L2, and the water outlet ends of the multiple water outlet nozzles are arranged on the inner wall of the box along the extension direction of the baffle 2. In Figure 3 , both sides of the guide plate 2 are provided with water nozzles fixed on the inner wall of the box. The spray angle of the water nozzle can be sprayed downward from the top of the guide plate 2 as needed, or it can be directly sprayed horizontally on the guide plate 2 on. In another optional embodiment, a plurality of water outlet nozzles are located upstream of the water collection tank, and the sprayed liquid also moves downstream with the waste heat driven by the waste heat and hits the guide plate 2 .

Some dust and oil stains carried by the waste heat will adhere to the guide plate 2, and the stains will drip from the guide plate 2 into the air collecting box L2. A sewage outlet 13 is opened at the bottom of the air duct 1 of the air collecting box L2 to discharge the stains. Prevent stains from accumulating too much in the air duct 1 of the air collecting box L2 and affecting the safety of the air duct 1.

In the above structure, the body of the water tank 3 has good thermal conductivity and can absorb heat from the outside to heat the liquid in the water tank 3. The water tank 3 is installed on the outer surface of the air collecting box L2 through thermal conductive glue. The common shape of the water tank 3 is a rectangle, as shown in Figure 1. The shape of the air duct section belonging to the air collecting box L2 is also set in a rectangular shape to facilitate the fixation of the water tank 3 on the air duct, and also to increase the distance between the water tank 3 and the air collecting box L2. contact area to increase heat absorption.

In the above structure, the water tank 3 is shown in Figures 1 and 2, and the width and length of the water tank 3 are respectively smaller than the width and length of the air collecting box 1. The water tank 3 adopts this size to better fit and adapt to the air collecting box 1, thereby ensuring the heat transfer efficiency of the water tank 3. Only the bottom of the water tank 3 is in contact with the air collecting box L2. In order to improve the heating efficiency of the liquid, the side walls of the water tank 3 also need to absorb heat. Therefore, a thermally conductive heat conductive plate is connected to the side wall of the water tank 3 and the same side surface of the air collecting box L2. 4. Conduct heat to the side wall of the water tank 3 through the heat conduction plate 4 to accelerate the temperature rise of the liquid. Thermal conductive plate 4 is bonded with adhesive 5 when in contact with the outer walls of water tank 3 and air duct 1. Among them, adhesive 5 is thermally conductive silica gel or graphene thermally conductive adhesive, which not only ensures the installation stability of water tank 3, but also It is ensured that the thermal conductive plate 4 can obtain good thermal conductive effect through the thermally conductive adhesive.

Furthermore, the material of the thermal conductive plate 4 can be the above-mentioned metal material with good thermal conductivity, and is constructed with a hollow cavity 42, and a superconducting liquid is sealed in the cavity 42. The superconducting liquid is also called a thermal conductive liquid or a thermal conductive liquid. Liquid has the characteristics of low boiling point. The superconducting liquid can boil and conduct heat quickly when the temperature of the heat conducting plate reaches 30 degrees. Then the heat conducting plate 4 is heated by the boiling heat dissipation of the superconducting liquid, and finally conducts the heat to the water tank 3 for liquid heating.

Preferably, the heat conduction plate 4 is arranged on the same side as the air guide plate 2 so that the heat in the air collecting box L2 is closer to the heat conduction plate 4 and reduces the heat transfer loss so that the heat conduction plate 4 can obtain heat faster.

Preferably, the heat conducting plate 4 can form the wall of the water tank 3 so that the heat conducting plate 4 is in direct contact with the liquid.

Preferably, a number of heat conduction pipes 41 extending linearly from the air collecting box L2 toward the water tank 4 are provided on the surface of the heat conduction plate 4. The heat conduction pipes 41 form a groove shape, and adjacent heat conduction pipes 41 are spaced apart to reduce the usage of superconducting liquid and seal. The cavity 42 of the oil superconducting liquid can be inserted into the heat pipe 41. The cavity 42 is also constructed into a corresponding linear shape and can be removably inserted into the heat pipe 41. The superconducting liquid can be replaced by removing the cavity 42.

Furthermore, a thermal insulation layer (not shown) is attached to the surface of the heat conduction plate 4 to prevent heat loss and prevent the lost heat from causing disasters.

The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, based on this The idea of the invention will be subject to change in the specific implementation and scope of application. In summary, the contents of this description should not be understood as limiting the invention.

Claims (10)

1. A heat collecting device that absorbs heat from waste hot gas, characterized in that it includes: The air duct has a duct extending between the air inlet and the air outlet. The duct is provided with an air collecting box. The duct cross-sectional area of the air collecting box is larger than the air outlet and the duct of the air outlet. Cross-sectional area, a deflector is provided in the air duct; The baffle extends toward the inner wall of the air collecting box, so that the waste heat gas is collected between the baffle and the inner wall of the air collecting box; A water tank, the water tank is installed on the air collecting box, and the body of the water tank is used to store liquid; The heat conduction plate is provided with a hollow cavity, and the cavity is filled with superconducting liquid. The side of the heat conduction plate with the cavity is attached to the outer wall of the air box and the water tank. The outer side wall of the air collecting box extends from the outer side wall of the air collecting box to the outer side wall of the water tank. 2. The heat collecting device according to claim 1, wherein the deflector is V-shaped and its opening direction is toward the air outlet. 3. The heat collecting device according to claim 1, wherein the deflector gradually moves from the middle part of the air collecting box in a direction from the air inlet toward the air outlet and toward the center of the air collecting box. Medial wall extension. 4. The heat collecting device according to claim 1, wherein the air collecting box and the water tank are fixed by thermal conductive glue, and the outer side walls of the air collecting box and the outer side walls of the water tank are respectively fixed by thermal conductive glue. and fixed to the heat conducting plate. 5. The heat collecting device according to claim 1, characterized in that the air duct is installed at the tail of the original exhaust duct or between the air inlet end and the air outlet end of the original exhaust duct. 6. The heat collecting device according to claim 1, wherein a plurality of heat conducting tubes are provided on the heat conducting plate, and the cavity is formed in the heat conducting tubes. 7. The heat collecting device according to claim 1, wherein the surface of the thermal conductive plate is covered with a thermal insulation layer. 8. The heat collecting device according to claim 1, wherein the cross section of the air duct of the air collecting box is rectangular, and the opposite surface of the water box and the air duct is a flat surface. 9. The heat collecting device according to claim 1, characterized in that a sewage outlet is provided on the air duct of the air collecting box, and the sewage outlet is connected to the inside of the air duct. 10. The heat collecting device according to claim 1, characterized in that there are multiple cavities, and the plurality of cavities extend along a linear direction.