A combustion grate flue gas heat recycling device

Abstract

The present application relates to the technical field of smoke heat recovery, and discloses a combustion furnace smoke heat recycling device, which comprises a smoke dust filtering part, a smoke gas high-temperature recycling part and an acid dew preventing part.The smoke dust filtering part comprises a smoke dust pipe and a dust removal box connected to one end of the smoke dust pipe, and a filter screen mechanism for filtering smoke dust is installed in the dust removal box; the smoke gas high-temperature recycling part comprises a water tank, and a heat exchange assembly for heating water source by using the temperature of smoke gas is installed in the water tank; and the acid dew preventing part is installed on the smoke gas high-temperature recycling part and used for heating the exhaust smoke and keeping the water temperature.The smoke dust filtering part can effectively clean the filter screen in real time, ensure the smoke gas passing rate of the filter screen, and reduce the maintenance cost without manual cleaning, and the cleaning action is driven by the airflow of smoke gas without additional energy consumption, so that the device has a good practical effect.The acid dew preventing part uses a part of high-temperature smoke gas to heat the low-temperature smoke gas, so that the exhaust temperature is higher than the temperature at which acid mist condenses, the generation of acid dew is prevented, and the damage of acid dew to equipment is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of flue gas heat recovery, and more particularly to a device for reusing flue gas heat from a combustion furnace. Background Technology

[0002] A combustion furnace is a combustion heating device, including electric combustion furnaces and fuel combustion furnaces, which are widely used in industrial fields and daily life.

[0003] The flue gas discharged from the combustion furnace contains a large amount of heat. Directly discharging the high-temperature flue gas into the air not only pollutes the air but also wastes resources. Therefore, power plant combustion furnaces are equipped with heat recovery equipment to use the heat of the flue gas to heat water sources and supply hot water to underfloor heating or other places that need hot water. This not only reduces pollution but also generates revenue by utilizing waste heat.

[0004] However, boiler fuel usually contains a certain amount of sulfur, nitrogen and carbon, so its tail flue gas contains acidic gases such as SO2, SO3, NO, NO2, CO and CO2. When heating water, the temperature of the high-temperature flue gas will drop after heat exchange. Under low temperature conditions, these acidic gases will further combine with water vapor in the flue gas to form corresponding acid vapors. If the exhaust temperature is too low, the wall temperature of the metal convection heating surface will be lower than the acid dew point of the flue gas, and acid droplets will condense on the surface of the metal heating surface. These condensed acid droplets will not only corrode the heating surface, but also combine with fly ash particles in the flue gas and rust peeling off from the metal heating surface to cause ash hardening and blockage of the flue, making it difficult to maintain negative pressure, and may even lead to deterioration of combustion in the furnace or failure to operate.

[0005] Meanwhile, the flue dust filter is easily clogged due to the impact of initial flue gas over a long period of time, making regular cleaning essential and thus increasing maintenance costs. Summary of the Invention

[0006] In view of the problems existing in the above-mentioned combustion furnace flue gas heat recovery devices, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a device for reusing flue gas heat from a combustion furnace.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a combustion furnace flue gas heat recovery device, comprising:

[0009] The dust filtration section includes a dust pipe and a dust collection box connected to one end of the dust pipe. A hot exhaust outlet is provided on one side of the dust collection box, and a filter screen mechanism for filtering dust is installed inside the dust collection box.

[0010] The high-temperature flue gas reuse section includes a water tank. One end of the water tank is connected to a flue heat main pipe connected to the flue heat outlet, and the other end of the water tank is connected to a low-temperature flue gas discharge pipe. The interior of the water tank is equipped with a heat exchange component that uses the flue gas temperature to heat the water source.

[0011] The anti-acid-condensation component is installed on the high-temperature flue gas reuse section to heat the exhaust gas and keep the water outlet warm.

[0012] As a preferred embodiment of the combustion furnace flue gas heat reuse device of the present invention, the filter mechanism includes a cover box disposed inside the dust collection box, the surface of the cover box is provided with an installation groove, the inner side of the installation groove is installed with a filter screen, and the gap between the bottom of the cover box and the inner wall of the dust collection box forms a dust discharge chamber.

[0013] As a preferred embodiment of the combustion furnace flue gas heat reuse device of the present invention, wherein: a dust scraping component for real-time cleaning of the filter screen is provided on the inner side of the cover box;

[0014] The dust scraper assembly includes a scraper that adheres to the inside of the filter screen and a linkage that uses the airflow of the dust conveyor to drive the scraper to reciprocate and move against the inside of the filter screen.

[0015] As a preferred embodiment of the combustion furnace flue gas heat reuse device of the present invention, the scraper includes guide rails fixed inside the cover box and located on both sides of the filter screen, a movable plate is slidably connected between the two guide rails, and a scraper cotton that fits the filter screen is provided on one side of the movable plate.

[0016] As a preferred embodiment of the combustion furnace flue gas heat reuse device of the present invention, the linkage component includes a rotating roller disposed inside the cover box, both ends of the rotating roller are rotatably connected to the inner wall of the dust collector box, and a fan wheel is sleeved and fixed at the middle position of the outside of the rotating roller. A linkage disc is symmetrically disposed on the rotating roller, and a linkage rod connected to the outside of the movable plate is movably disposed inside the linkage disc.

[0017] In a preferred embodiment of the combustion furnace flue gas heat reuse device of the present invention, the heat exchange component includes a rotating rod disposed in a water tank, and heat exchange plates are disposed on the outside of the rotating rod.

[0018] As a preferred embodiment of the combustion furnace flue gas heat reuse device of the present invention, both ends of the rotating rod are provided with air slip rings, and both ends of the rotating rod are rotatably connected to the inside of the water tank through the air slip rings.

[0019] As a preferred embodiment of the combustion furnace flue gas heat reuse device of the present invention, wherein: the fixed ends of the two air slip rings are connected to a flue gas heat conduit 1, the other end of one of the flue gas heat conduits 1 is connected to a flue gas heat main pipe 1, and the other flue gas heat conduit 1 is connected to a low temperature flue gas discharge pipe.

[0020] Both of the two air slip rings are equipped with second flue gas heat pipes, and the other end of each second flue gas heat pipe is fixedly connected to a heat exchange plate.

[0021] As a preferred embodiment of the combustion furnace flue gas heat reuse device of the present invention, the anti-acid dew part includes a heating sleeve and an insulation sleeve that are sleeved and fixed to the outside of the low-temperature flue gas discharge pipe. The gap between the heating sleeve and the low-temperature flue gas discharge pipe forms a heating cavity. The insulation sleeve has an insulation cavity inside and is fixed to the bottom of the water tank.

[0022] As a preferred embodiment of the combustion furnace flue gas heat recovery device of the present invention, the outlet end of the heating jacket is connected to the inlet end of the insulation jacket, and the inlet end of the heating jacket is connected to the second flue gas heat main pipe, the outlet end of the insulation jacket is connected to the heat recovery pipe, and the other end of the second flue gas heat main pipe is connected to the inside of the dust removal box.

[0023] The beneficial effects of the present invention are as follows: The dust filtration part of the present invention can effectively clean the filter screen in real time, ensuring the flue gas passage rate of the filter screen, improving the flue heat reuse effect, eliminating the need for manual cleaning, reducing maintenance costs, and the cleaning action is driven only by the airflow of flue gas, requiring no additional energy consumption, thus having better practical effect.

[0024] The anti-acid dew section uses a portion of high-temperature flue gas to heat the low-temperature flue gas in the exhaust pipe, ensuring that its emission temperature is higher than the acid mist condensation temperature. This effectively prevents acid dew formation, reduces damage to the equipment, and extends the overall service life of the equipment. The heated low-temperature flue gas also passes through an insulation chamber, which keeps the hot water output warm and prevents temperature drops during transport. Finally, the separated high-temperature flue gas is used as oxygen feedstock to the combustion furnace, improving its combustion efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0026] Figure 1 This is a schematic diagram of the overall structure of the combustion furnace flue gas heat recovery device of the present invention.

[0027] Figure 2 This is a schematic diagram of the flue gas filtration section in the combustion furnace flue gas heat recovery device of the present invention.

[0028] Figure 3This is a schematic diagram of the high-temperature flue gas reuse section in the combustion furnace flue gas heat reuse device of the present invention.

[0029] Figure 4 For the present invention Figure 3 A magnified structural diagram of point A in the middle.

[0030] Figure 5 This is a schematic diagram of the filter mechanism in the combustion furnace flue gas heat recovery device of the present invention.

[0031] Figure 6 This is a schematic diagram of the dust scraping assembly in the combustion furnace flue gas heat recovery device of the present invention.

[0032] Figure 7 This is a schematic diagram of the anti-acid dew section in the combustion furnace flue gas heat recycling device of the present invention. Detailed Implementation

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0036] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0037] Example 1

[0038] Reference Figure 1 A schematic diagram of the overall structure of a combustion furnace flue gas heat recovery device is provided, such as... Figure 1-4 A device for recovering heat from flue gas from a combustion furnace, comprising:

[0039] The dust filtration section 100 includes a dust pipe 101 and a dust collection box 102 connected to one end of the dust pipe 101. A smoke and heat outlet 103 is provided on one side of the dust collection box 102, and a filter screen mechanism 104 for filtering dust is installed inside the dust collection box 102.

[0040] Specifically, the inlet end of the flue pipe 101 is connected to the exhaust gas of the combustion furnace. The exhaust gas from the combustion furnace enters the dust collection box 102 through the flue pipe 101, and the filter screen mechanism 104 in the dust collection box 102 filters the flue gas and removes the dust.

[0041] The high-temperature flue gas reuse section 200 includes a water tank 201. One end of the water tank 201 is connected to a flue heat main pipe 202 connected to the flue heat outlet 103, and the other end of the water tank 201 is connected to a low-temperature flue gas discharge pipe 203. A heat exchange component 204 that uses the flue gas temperature to heat the water source is installed inside the water tank 201.

[0042] Specifically, a drain pipe 205 is installed at the bottom of the water tank 201, and an inlet pipe 206 is installed at the top of the water tank 201. The inlet pipe 206 is connected to a cold water source, and the drain pipe 205 is connected to a hot water storage tank. Water valves are installed on both the inlet pipe 206 and the drain pipe 205 to control the discharge of water. A level gauge is installed in the water tank 201 to detect the amount of water in the water tank 201, so that cold water can be added to the water tank 201.

[0043] Furthermore, the heat exchange assembly 204 includes a rotating rod 204a disposed in the water tank 201, and heat exchange plates 204b are disposed on the outside of the rotating rod 204a.

[0044] Furthermore, both ends of the rotating rod 204a are provided with air slip rings 204c, and both ends of the rotating rod 204a are rotatably connected to the inside of the water tank 201 through the air slip rings 204c.

[0045] Furthermore, the fixed ends of both air slip rings 204c are connected to the flue gas heat pipe 204d. The other end of one of the flue gas heat pipes 204d is connected to the flue gas heat main pipe 202, and the other flue gas heat pipe 204d is connected to the low temperature flue gas discharge pipe 203.

[0046] Both air slip rings 204c have a second flue gas heat pipe 204e installed on their rotating ends, and the other end of the second flue gas heat pipe 204e is fixedly connected to the heat exchange plate 204b.

[0047] Specifically, the second smoke heat pipe 204e is made of alloy material and has high strength. When the rotating rod 204a rotates, the second smoke heat pipe 204e can drive the rotating end of the air slip ring 204c to rotate.

[0048] Specifically, the heat exchange assembly 204 also includes a low-speed motor, a rotating rod 204a is fixedly connected to the rotating ends of two air slip rings 204c, and one end of the rotating rod 204a is fixedly connected to the drive end of the low-speed motor. The low-speed motor is used to drive the rotating rod 204a to rotate, thereby realizing the low-speed rotation of the heat exchange plate 204b.

[0049] Specifically, the heat exchange plate 204b has a plate-like spiral structure. The interior of the plate-like spiral structure is hollow, which allows the flue heat to enter or exit through the flue heat conduit 204e. The heat exchange plate 204b is made of ceramic metal, which not only has good thermal conductivity, but is also not easy to oxidize and has a long service life. The plate-like spiral structure has a wider contact surface with water, resulting in better heating effect.

[0050] Operation process: The flue gas from the combustion furnace enters the dust collection box 102 through the flue gas pipe 101. The filter screen mechanism 104 in the dust collection box 102 filters the flue gas and removes the dust. The flue gas heat after removing the dust enters the flue gas heat pipe 204d through the flue gas heat pipe 202, and then enters the heat exchange plate 204b through the flue gas heat pipe 204e. The heat exchange plate 204b comes into contact with water for heat exchange. The water temperature gradually rises and the flue gas temperature decreases. The flue gas with the lower temperature is discharged from the low temperature flue gas discharge pipe 203. As more high temperature flue gas exchanges heat, the water source inside the water tank 201 reaches the set temperature and is then discharged into the hot water storage tank through the drain pipe 205.

[0051] During heat exchange, a low-speed motor drives the heat exchange plate 204b to rotate at a low speed, which makes the heat exchange plate 204b more fully contacted with the water, improves heat exchange efficiency, reduces the use of flue gas heat, and the hot water is replenished through the inlet pipe 206 after being discharged.

[0052] Example 2

[0053] Reference Figure 5-6 The difference between this embodiment and the first embodiment is that the filter mechanism 104 includes a cover box 104a disposed inside the dust collection box 102. The surface of the cover box 104a is provided with an installation groove 104b. A filter screen 104c is installed inside the installation groove 104b. The gap between the bottom of the cover box 104a and the inner wall of the dust collection box 102 forms a dust discharge chamber 104d.

[0054] Specifically, the cover box 104a has a triangular cross-section, and a vertical plate is fixed at the bottom of the triangle. The filter screen 104c is installed on the upper inclined surface of the triangular structure of the cover box 104a, which just receives the flue gas entering the dust collection box 102. The bottom of the dust collection box 102 is provided with an exhaust port that communicates with the dust discharge chamber 104d. The dust blocked by the filter screen 104c can be discharged from the dust discharge chamber 104d.

[0055] Furthermore, a dust scraping assembly for real-time cleaning of the filter 104c is provided on the inner side of the cover 104a.

[0056] The dust scraper assembly includes a scraper 104e that adheres to the inner side of the filter 104c and a linkage 104f that uses the dust conveying wind to drive the scraper 104e to reciprocate and move in contact with the inner side of the filter 104c.

[0057] Furthermore, the scraper 104e includes guide rails 104e-1 fixed inside the cover box 104a and located on both sides of the filter screen 104c. A movable plate 104e-2 is slidably connected between the two guide rails 104e-1. A scraping cotton 104e-3 that fits the filter screen 104c is provided on one side of the movable plate 104e-2.

[0058] Furthermore, the linkage 104f includes a rotating roller 104f-1 disposed inside the cover box 104a. Both ends of the rotating roller 104f-1 are rotatably connected to the inner wall of the dust collector box 102. A fan wheel 104f-2 is sleeved and fixed at the middle position of the outside of the rotating roller 104f-1. A linkage disc 104f-3 is symmetrically disposed on the rotating roller 104f-1. A linkage rod 104f-4 connected to the outside of the movable plate 104e-2 is movably disposed inside the linkage disc 104f-3.

[0059] Specifically, the linkage disk 104f-3 consists of two disks and an eccentric column. The two disks are fixed on the rotating roller 104f-1, and the shafts of the two disks are not connected. They are only connected by the eccentric column, which is fixed at the edge between the two disks.

[0060] The linkage rod 104f-4 includes a swing rod, a connecting rod, and a rotating seat. The rotating seat is fixed to the outside of the movable plate 104e-2. One end of the swing rod is rotatably connected to the inside of the dust collector 102, and the surface of the swing rod is provided with a movable groove. The other end of the swing rod is rotatably connected to the rotating seat through the connecting rod. Since the eccentric column is set through the swing rod, the rotating roller 104f-1 rotates under the action of the flue gas flow. Its rotation will drive the linkage disk 104f-3 to rotate. The eccentric column will abut against the movable groove as it rotates. Since the length of the movable groove is equal to the circumference of the disk, it will not restrict the rotation of the eccentric column. Instead, the rotation of the eccentric column will drive the swing rod to swing back and forth. When swinging, the movable plate 104e-2 can slide in the guide rail 104e-1 through the connecting rod and the rotating seat. The scraper 104e-3 on the movable plate 104e-2 is attached to the filter screen 104c to remove the dust on the surface of the filter screen 104c.

[0061] Specifically, the filter mechanism 104 also includes a water replenishment component 104g, which is used to replenish water in the movable plate 104e-2 to ensure the wetness of the scraper 104e-3;

[0062] The water replenishment component 104g includes a water cavity inside the movable plate 104e-2 and a water replenishment tank. The water replenishment tank is connected to the movable plate 104e-2 via a hose. A metering water pump is installed on the hose. The metering water pump inputs water into the water cavity of the movable plate 104e-2 through the hose. Since the scraper 104e-3 is embedded in the water cavity, it will absorb water and make its surface wet. When scraping dust, the wetness of the scraper 104e-3 will absorb the dust and roll it into long strips. Under its own weight, it will fall into the dust discharge chamber 104d. This structure gathers the dust into strips. By increasing the weight of the dust, it will not be scattered by the airflow of the flue gas, thus improving the cleaning efficiency.

[0063] Specifically, a rotating plate is installed above the dust discharge chamber 104d. The middle section of the rotating plate is rotatably mounted above the dust discharge chamber 104d via a torsion spring. Under normal circumstances, both ends of the rotating plate will abut against the bottom of the horizontal plate on the inner wall of the dust discharge chamber 104d and the dust collector 102, respectively, to seal the dust discharge chamber 104d. A contact rod is fixed to the bottom of the swing rod. When the swing rod swings to its lowest point, it will abut against the upper end of the rotating plate, causing it to rotate under the action of the torsion spring. After rotation, its bottom will disengage from the dust discharge chamber 104d. At this time, the dust that has accumulated into strips will fall into the dust discharge chamber 104d and be discharged. When the contact rod no longer contacts the rotating plate, the rotating plate will be reset under the action of the torsion spring, sealing it again. This structure can reduce the loss of flue gas while automatically discharging dust.

[0064] The rest of the structure is the same as in Example 1.

[0065] Operation process: The flue gas flow entering the dust collector 102 will drive the rotating roller 104f-1 to rotate through the impeller 104f-2. After the rotating roller 104f-1 rotates, it will drive the scraper 104e-3 to clean the filter screen 104c through the linkage disc 104f-3 and the linkage rod 104f-4.

[0066] The metering water pump is introduced into the water chamber of the movable plate 104e-2 through a hose. Since the scraper 104e-3 is embedded in the water chamber, it will absorb water and make its surface wet. When scraping dust, the wetness of the scraper 104e-3 will absorb the dust and roll it into long strips. Under its own weight, it will fall into the dust discharge chamber 104d. This structure gathers the dust into strips. By increasing the weight of the dust, it will not be scattered by the airflow of the flue gas, thus improving the cleaning efficiency.

[0067] A rotating plate is mounted above the dust discharge chamber 104d. The middle section of the rotating plate is rotatably mounted above the dust discharge chamber 104d via a torsion spring. Under normal circumstances, both ends of the rotating plate will abut against the bottom of the horizontal plate on the inner wall of the dust discharge chamber 104d and the dust collector 102, respectively, to seal the dust discharge chamber 104d. A contact rod is fixed to the bottom of the swing rod. When the swing rod swings to its lowest point, it abuts against the upper end of the rotating plate, causing it to rotate under the action of the torsion spring. After rotation, its bottom separates from the dust discharge chamber 104d. At this time, the dust that has accumulated into strips will fall into the dust discharge chamber 104d and be discharged. When the contact rod no longer contacts the rotating plate, the rotating plate will be reset under the action of the torsion spring, sealing it again. This structure can reduce the loss of flue gas while automatically discharging dust.

[0068] Example 3

[0069] Reference Figure 7 The difference between this embodiment and the previous embodiments is that the combustion furnace flue gas heat recovery device in this embodiment further includes:

[0070] The anti-acid dew section 300 is installed on the high-temperature flue gas reuse section 200 for heating the exhaust gas and keeping the water outlet warm.

[0071] The anti-acid dew section 300 includes a heating sleeve 301 and an insulation sleeve 302 that are sleeved and fixed to the outside of the low-temperature flue gas discharge pipe 203. The gap between the heating sleeve 301 and the low-temperature flue gas discharge pipe 203 forms a heating cavity 303. The insulation sleeve 302 has an insulation cavity 304 inside, and the insulation sleeve 302 is fixed to the bottom of the water tank 201.

[0072] Specifically, the drain pipe 205 is installed in the insulation cavity 304, and the outlet of the drain pipe 205 passes through the insulation cavity 304. The upper end of the insulation cavity 304 is attached to the bottom of the water tank 201. When the flue gas returns through the insulation cavity 304, it will heat up the water source at the bottom of the water tank 201, thereby improving the heating efficiency of the water source. At the same time, when the hot water is drained through the drain pipe 205 after boiling, the flue gas heat can be wrapped around the outside of the drain pipe 205, so that the hot water will not lose heat when flowing, thus improving the insulation effect.

[0073] Furthermore, the outlet of the heating jacket 301 is connected to the inlet of the insulation jacket 302, and the inlet of the heating jacket 301 is connected to the second flue gas and heat pipe 305. The outlet of the insulation jacket 302 is connected to the heat recovery pipe 306, and the other end of the second flue gas and heat pipe 305 is connected to the inside of the dust removal box 102.

[0074] Specifically, the second flue gas heat pipe 305 enters the heating chamber 303 to raise the temperature inside the low-temperature flue gas discharge pipe 203, so that the flue gas heat in the low-temperature flue gas discharge pipe 203 is higher than 130°. This avoids the problem of acid droplets condensing on the surface of the metal heating surface due to excessively low flue gas heat, which could damage the equipment (acid droplets will not only corrode the heating surface, but can also combine with fly ash particles in the flue gas and rust peeling off from the metal heating surface, causing ash accumulation, hardening, and blockage of the flue, making it difficult to maintain negative pressure, and may even lead to deterioration of combustion inside the furnace or failure to operate).

[0075] After passing through the heating chamber 303, the flue gas will enter the insulation chamber 304. The upper end of the insulation chamber 304 is attached to the bottom of the water tank 201. When the flue gas returns through the insulation chamber 304, it will heat up the water source at the bottom of the water tank 201, which improves the heating efficiency of the water source. At the same time, when the hot water is drained through the drain pipe 205 after boiling, the flue gas heat can be wrapped around the outside of the drain pipe 205, so that the hot water will not lose heat when flowing, thus improving the insulation effect.

[0076] Finally, the outlet end of the regenerator tube 306 is connected to the inlet end of the combustion furnace, which can feed back into the combustion furnace and improve its combustion efficiency.

[0077] The rest of the structure is the same as in Example 2.

[0078] Operation process: The second flue gas heat pipe 305 enters the heating chamber 303 to raise the temperature of the low-temperature flue gas discharge pipe 203, so that the flue gas heat in the low-temperature flue gas discharge pipe 203 is higher than 130°, avoiding the problem of acid droplets condensing on the surface of the metal heating surface due to excessively low flue gas heat, which would damage the equipment (acid droplets will not only corrode the heating surface, but can also combine with fly ash particles in the flue gas and rust peeling off the metal heating surface, causing ash accumulation, hardening and blockage of the flue, making it difficult to maintain negative pressure, and may even lead to deterioration of combustion in the furnace or failure to operate).

[0079] After passing through the heating chamber 303, the flue gas will enter the insulation chamber 304. The upper end of the insulation chamber 304 is attached to the bottom of the water tank 201. When the flue gas returns through the insulation chamber 304, it will heat up the water source at the bottom of the water tank 201, which improves the heating efficiency of the water source. At the same time, when the hot water is drained through the drain pipe 205 after boiling, the flue gas heat can be wrapped around the outside of the drain pipe 205, so that the hot water will not lose heat when flowing, thus improving the insulation effect.

[0080] Finally, the outlet end of the regenerator tube 306 is connected to the inlet end of the combustion furnace, which can feed back into the combustion furnace and improve its combustion efficiency.

[0081] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0082] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0083] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0084] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for recycling flue gas heat from a combustion furnace, characterized in that: include: The dust filtration section (100) includes a dust pipe (101) and a dust collection box (102) connected to one end of the dust pipe (101). A smoke and heat outlet (103) is provided on one side of the dust collection box (102), and a filter screen mechanism (104) for filtering dust is installed inside the dust collection box (102). The high-temperature flue gas reuse section (200) includes a water tank (201), one end of which is connected to a flue heat main pipe (202) connected to the flue heat outlet (103), and the other end of which is connected to a low-temperature flue gas discharge pipe (203). A heat exchange component (204) for heating water using flue gas temperature is installed inside the water tank (201). The heat exchange assembly (204) includes a rotating rod (204a) disposed in a water tank (201), and heat exchange plates (204b) are disposed on the outside of the rotating rod (204a); Both ends of the rotating rod (204a) are provided with air slip rings (204c), and both ends of the rotating rod (204a) are rotatably connected to the inside of the water tank (201) through the air slip rings (204c). Both of the fixed ends of the air slip rings (204c) are connected to a flue gas heat pipe (204d), one end of which is connected to a flue gas heat main pipe (202), and the other end of which is connected to a low-temperature flue gas exhaust pipe (203). Both of the two air slip rings (204c) are equipped with a second flue gas heat pipe (204e) at their rotating ends, and the other end of the second flue gas heat pipe (204e) is fixedly connected to the heat exchange plate (204b). The anti-acid dew section (300) is installed on the high-temperature flue gas reuse section (200) for heating the exhaust gas and keeping the water outlet warm.

2. The combustion furnace flue gas heat recovery device as described in claim 1, characterized in that: The filter mechanism (104) includes a cover (104a) disposed inside the dust collection box (102). The surface of the cover (104a) is provided with an installation groove (104b). A filter (104c) is installed on the inner side of the installation groove (104b). The gap between the bottom of the cover (104a) and the inner wall of the dust collection box (102) forms a dust discharge chamber (104d).

3. The combustion furnace flue gas heat recovery device as described in claim 2, characterized in that: The inner side of the cover (104a) is provided with a dust scraping assembly for real-time cleaning of the filter screen (104c); The dust scraper assembly includes a scraper (104e) that adheres to the inside of the filter screen (104c) and a linkage (104f) that uses the dust conveying air force to drive the scraper (104e) to reciprocate and move in contact with the inside of the filter screen (104c).

4. The combustion furnace flue gas heat recovery device as described in claim 3, characterized in that: The scraper (104e) includes guide rails (104e-1) fixed inside the cover (104a) and located on both sides of the filter screen (104c). A movable plate (104e-2) is slidably connected between the two guide rails (104e-1). A scraping cotton (104e-3) that fits against the filter screen (104c) is provided on one side of the movable plate (104e-2).

5. The combustion furnace flue gas heat recovery device as described in claim 4, characterized in that: The linkage component (104f) includes a rotating roller (104f-1) disposed inside the cover box (104a). Both ends of the rotating roller (104f-1) are rotatably connected to the inner wall of the dust collector box (102). A fan wheel (104f-2) is sleeved and fixed at the middle position of the outside of the rotating roller (104f-1). A linkage disc (104f-3) is symmetrically disposed on the rotating roller (104f-1). A linkage rod (104f-4) connected to the outside of the movable plate (104e-2) is movably disposed inside the linkage disc (104f-3).

6. The combustion furnace flue gas heat recovery device as described in claim 1, characterized in that: The anti-acid dew part (300) includes a heating sleeve (301) and an insulation sleeve (302) that are sleeved and fixed to the outside of the low-temperature flue gas discharge pipe (203). The gap between the heating sleeve (301) and the low-temperature flue gas discharge pipe (203) forms a heating cavity (303). The insulation sleeve (302) has an insulation cavity (304) inside, and the insulation sleeve (302) is fixed to the bottom of the water tank (201).

7. The combustion furnace flue gas heat recovery device as described in claim 6, characterized in that: The outlet of the heating jacket (301) is connected to the inlet of the insulation jacket (302), and the inlet of the heating jacket (301) is connected to the second flue gas and heat pipe (305). The outlet of the insulation jacket (302) is connected to the heat recovery pipe (306), and the other end of the second flue gas and heat pipe (305) is connected to the inside of the dust removal box (102).

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