Heating furnace capable of recovering waste heat

Abstract

The invention provides a heating furnace capable of recovering waste heat, and belongs to the technical field of fluid heating, the heating furnace comprises a furnace body, the furnace body is internally provided with a partition plate for dividing the interior into an upper layer and a lower layer, and the interior of the lower layer is connected with a fuel pipe, an air inlet pipe and a smoke exhaust pipe; a section of snakelike bent pipe is arranged in the inner barrel in the axial direction of the inner barrel, the snakelike bent pipe is horizontally arranged, the two ends of the snakelike bent pipe penetrate out of the two ends of the inner barrel respectively, one end of the snakelike bent pipe is connected with the end, extending out of the furnace body, of the smoke exhaust pipe, and heat conduction oil is arranged in the inner barrel; the inner cylinder is coaxially sleeved with the outer cylinder, the front end and the rear end of the outer cylinder are connected with a water inlet pipe and a water outlet pipe respectively, an annular brush is connected into the outer cylinder in a sliding mode in the axial direction of the outer cylinder, the annular brush is driven by a linear mechanism, the inner cylinder is sleeved with the annular brush, and bristles abutting against the inner cylinder are arranged on the inner side of the annular brush; and the brush is used for brushing scale formed outside the inner barrel. The heating furnace can automatically remove scale on the outer wall of the smoke exhaust pipeline for heating water, and the heating efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid heating, relates to the waste heat utilization of a heating furnace, and in particular to a heating furnace capable of recovering waste heat. Background Art

[0002] There are two heating methods for heating furnaces: fuel heating and electric heating. Fuel heating furnaces produce smoke after fuel combustion. If the smoke is discharged directly, the smoke will take away part of the heat and cause heat waste. The smoke exhaust pipe of some existing heating furnaces will be connected to the waste heat recovery device to utilize the waste heat. For example, the smoke exhaust pipe is placed in a water tank to heat the water in the water tank, which is used as heating water or hot water for industrial production. Since the heat transfer efficiency between the smoke and the smoke exhaust pipe is not high, a longer smoke exhaust pipe needs to be set up, and then the smoke exhaust pipe is placed in the water tank to absorb as much heat from the smoke as possible. In order to reduce the length of the water tank, the smoke exhaust pipe is usually connected to a serpentine elbow, and then the serpentine elbow is placed in the water tank for heat exchange. However, the outer wall of the serpentine elbow is in contact with the heated water in the water tank for a long time, which will cause scale to form on the outer wall of the serpentine elbow, reducing the heat transfer efficiency of the pipeline. And because the serpentine elbow is a shape that bends back and forth, it is not convenient to automatically clean and remove scale, so it is necessary to make improvements. Summary of the invention

[0003] In order to solve the above-mentioned defects of the prior art, the present application provides a heating furnace that can recover waste heat, which can automatically remove scale on the outer wall of the pipe that heats the water body, thereby improving the heating efficiency.

[0004] In order to achieve the above object, the present invention adopts the following technologies: A heating furnace capable of recovering waste heat, comprising: The furnace body is divided into an upper layer and a lower layer by a partition. The upper layer is used to place objects to be heated, and the lower layer is connected to the fuel pipe, air intake pipe, and smoke exhaust pipe respectively. The inner cylinder has a serpentine elbow horizontally arranged therein, the serpentine elbow is arranged horizontally, the two ends of the serpentine elbow respectively pass through the two ends of the inner cylinder, and one end of the serpentine elbow is connected to the end of the exhaust pipe extending out of the furnace body, and heat transfer oil is arranged in the inner cylinder; The outer cylinder is coaxially sleeved outside the inner cylinder, and the front and rear ends of the outer cylinder are respectively connected to the water inlet pipe and the water outlet pipe. An annular brush that slides along the axial direction is arranged inside the outer cylinder. The annular brush is driven by a linear mechanism. The annular brush is sleeved outside the inner cylinder, and the inner side of the annular brush is provided with bristles that abut against the inner cylinder, so as to brush away scale formed on the wall of the inner cylinder.

[0005] Furthermore, the linear mechanism includes a driving motor and a screw, the screw is rotatably arranged in a rectangular shell, and the axial direction of the screw is parallel to the length direction of the rectangular shell, the rectangular shell is arranged at the top of the outer cylinder, the length direction of the rectangular shell is parallel to the axial direction of the outer cylinder, the bottom of the rectangular shell has a first strip groove, the top of the outer cylinder has a second strip groove connected to the first strip groove, a vertical plate is provided on the top of the annular brush, the vertical plate is threadedly connected to the screw, and the output shaft of the driving motor is connected to one end of the screw.

[0006] Furthermore, a plurality of pairs of baffles are provided in the rectangular shell in a connected manner end to end along the length direction, and each pair of baffles is hinged to two sides of the rectangular shell respectively. A driving mechanism is provided in the rectangular shell for driving the baffles to rotate. When any pair of baffles rotates inward to form a preset angle with its symmetry plane, a pair of baffles abut against each other to block water vapor formed by water in the outer cylinder. The distance between a pair of baffles near the front end of the rectangular shell and the inner side of the front end of the rectangular shell matches the thickness of the vertical plate. Rectangular blocks are provided at the front ends of the interiors of both sides of the rectangular shell. When the vertical plate abuts against the front end of the rectangular shell, the vertical plate abuts against the two rectangular blocks, and a pair of baffles near the rectangular block abuts against the rectangular block, and a pair of baffles near the rear end of the rectangular shell abuts against the rear end of the outer cylinder and the rear end of the rectangular shell.

[0007] Furthermore, when the relative baffles rotate inwardly to abut against each other, the baffles are in a downwardly tilted state.

[0008] Furthermore, a plurality of pairs of first springs are arranged in an array along the length direction in the rectangular shell, and the plurality of pairs of first springs are respectively connected to the inner sides of the plurality of pairs of baffles, and when any pair of baffles abuts, the first springs connected thereto are in a stretched state; the driving mechanism comprises a pair of symmetrically arranged push blocks, the pair of push blocks are connected by a rectangular slider, a vertical slide groove is provided on the vertical plate, the rectangular slide groove is slidably connected to the vertical slide groove, and the bottom of the push blocks have an inclined surface inclined upward on the outer side, and when the push blocks abut the bottom of the baffles and continue to move forward, the push blocks push the baffles upward to abut against the two sides of the vertical plate; a second spring is arranged in the vertical slide groove, the second spring is connected to the rectangular slide groove, and a accommodating groove is provided on the inner side of the front end of the rectangular shell for accommodating a push block near the front end of the rectangular shell, and when the push block completely enters the accommodating groove, the inclined surface of the bottom of the push block abuts against the wall body at the bottom of the accommodating groove, the second spring is in a compressed state, and a pair of baffles near the front end of the rectangular shell are in a state of abutting each other.

[0009] Furthermore, a pair of baffles near the front end of the rectangular shell are provided with connecting grooves toward one end of the accommodating groove, a third spring is provided in the connecting grooves, and an extension plate is slidably provided in the connecting grooves, the extension plate is connected to the spring, when the spring is in a natural state, the extension plate extends out of the connecting groove, and the distance between the extension plate and the front end of the rectangular shell matches the thickness of the vertical plate, when the vertical plate pushes the extension plate to completely enter the connecting groove, a push block near the accommodating groove is outside the accommodating groove.

[0010] Furthermore, the height of the rear end of the outer cylinder is lower than the height of the front end of the outer cylinder, and the serpentine elbow is arranged to be inclined along the axial direction of the outer cylinder.

[0011] Furthermore, the other end of the serpentine curved pipe is connected to one side of a vertically arranged guide pipe, the water outlet pipe is connected to the side of the guide pipe, and the bottom of the guide pipe is connected to a water storage tank.

[0012] Furthermore, a plurality of pairs of baffles are arranged in an array along the length direction in the rectangular shell to limit the maximum angle of inward rotation of the baffles. When the plurality of pairs of baffles are rotated inward to abut against each other, the inner sides of the plurality of pairs of baffles abut against the plurality of pairs of baffles respectively.

[0013] Furthermore, a pair of slide rails are axially arranged on the inner side of the outer cylinder, and a pair of protrusions are arranged on the outer side of the annular brush, and the pair of protrusions are slidably connected with the pair of slide rails.

[0014] The beneficial effects of the present invention are: 1. After the flue gas discharged from the furnace body passes through the serpentine elbow and the heat is absorbed by the heat transfer oil, the heat is transferred to the water in the outer cylinder through the inner cylinder. No scale will be formed on the outer wall of the serpentine elbow. The linear mechanism can be controlled to drive the annular brush to move and automatically remove the scale on the outer wall of the inner cylinder to prevent the scale from affecting the heat transfer efficiency.

[0015] 2. When there is no need to remove scale, close the baffle to block most of the water vapor generated after the water in the outer cylinder is heated, avoiding excessive water vapor from contacting the screw and affecting the life of the screw.

[0016] 3. The connection structure of the push block and the annular brush cooperates with the first spring to control the baffle to open or close under the drive of the screw rod, and there is no need to set up an additional power source to control the baffle to open or close. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of the overall structure of the heating furnace according to an embodiment of the present application.

[0018] Figure 2 This is a three-dimensional diagram of the internal structure of the furnace body in the heating furnace of an embodiment of the present application.

[0019] Figure 3 This is a three-dimensional diagram of the connection structure of the inner cylinder, the annular brush, and the rectangular shell in the heating furnace of an embodiment of the present application.

[0020] Figure 4 It is a three-dimensional diagram of the connection structure between the serpentine elbow and the smoke exhaust pipe in the heating furnace of an embodiment of the present application.

[0021] Figure 5 This is a three-dimensional diagram of the connection structure of the outer cylinder, the inner cylinder and the annular brush in the heating furnace of an embodiment of the present application.

[0022] Figure 6 This is a three-dimensional diagram of some structures in the heating furnace of an embodiment of the present application.

[0023] Figure 7 It is a front view of the connection structure between the rectangular shell and the baffle in the heating furnace of an embodiment of the present application.

[0024] Figure 8 This is a structural stereogram of an annular brush in a heating furnace according to an embodiment of the present application.

[0025] Fig. 9 for Figure 8 Magnified view of section C in .

[0026] Fig.10 This is a structural stereogram of another part of the heating furnace according to an embodiment of the present application.

[0027] Fig.11 for Fig.10 Magnified view of section A in .

[0028] Fig.12 for Fig.10 Magnified view of part B in .

[0029] Fig.13 This is a three-dimensional diagram of the connection structure of the extension plate baffle in the heating furnace of an embodiment of the present application.

[0030] Figure markings: furnace body-1, inner tube-2, outer tube-3, annular brush-4, driving motor-5, rectangular shell-6, baffle-7, push block-8, guide tube-9, water tank-10, partition-101, fuel pipe-102, air inlet pipe-103, smoke exhaust pipe-104, serpentine elbow-201, water inlet pipe-301, water outlet pipe-302, second strip groove-303, slide rail-304, bristles-401, vertical plate-402, protrusion-403, vertical slide groove-4021, screw rod-501, first strip groove-601, rectangular block-602, accommodating groove-603, baffle-604, first spring-701, connecting groove-702, third spring-703, extension plate-704, rectangular slider-801, second spring-802, inclined surface-803. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the implementation modes of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] The present application embodiment provides a heating furnace capable of recovering waste heat, such as Figure 1-Figure 13 As shown, it includes a furnace body 1, an inner cylinder 2, an outer cylinder 3, etc.

[0033] Specifically, a partition 101 is provided inside the furnace body 1, and the partition 101 divides the interior of the furnace body 1 into an upper layer and a lower layer. The upper layer is used to place items to be heated, and the interior of the lower layer is respectively connected to the fuel pipe 102, the air intake pipe 103, and the exhaust pipe 104; a section of a serpentine elbow 201 is horizontally provided inside the inner tube 2, and the serpentine elbow 201 is horizontally arranged, and the two ends of the serpentine elbow 201 respectively pass through the two ends of the inner tube 2, and one end of the serpentine elbow 201 and the exhaust pipe 104 extend out of the furnace body 1. One end of the inner cylinder 2 is connected, and heat transfer oil is provided in the inner cylinder 2 for absorbing and storing heat in the flue gas; the outer cylinder 3 is coaxially sleeved outside the inner cylinder 2, and the front and rear ends of the outer cylinder 3 are respectively connected to the water inlet pipe 301 and the water outlet pipe 302, and an annular brush 4 is axially slidably connected to the outer cylinder 3. The annular brush 4 is driven by a linear mechanism, and is sleeved outside the inner cylinder 2. The inner side of the annular brush 4 is provided with bristles 401 that abut against the inner cylinder 2, which are used to brush away scale formed on the wall of the inner cylinder 2.

[0034] In actual use, natural gas can be used as fuel. The flue gas generated after combustion enters the serpentine bend 201 through the smoke exhaust pipe 104, and heat is exchanged with the heat transfer oil in the inner tube 2 through the serpentine bend 201. At this time, water to be heated is injected into the outer tube 3 through the water inlet pipe 301, and the water can be heated. Because the water body does not contact the outer wall of the serpentine bend 201, scale will not be formed on the outer wall of the serpentine bend 201. After the heating furnace has been used for a period of time, the scale layer formed on the outer wall of the inner tube 2 can be brushed off by controlling the linear mechanism to drive the annular brush to move back and forth along the axial direction of the inner tube 2. A scale remover can also be placed in the outer tube 3, and then the linear mechanism is controlled to drive the annular brush to move back and forth along the axial direction of the inner tube 2 to improve the scale removal effect and prevent the scale layer from affecting the heat conduction between the inner tube 2 and the water.

[0035] When the flue gas passes through the serpentine bend 201, the outer wall of the serpentine bend 201 absorbs heat from the heat transfer fluid, which may cause the moisture in the flue gas to condense on the inner wall of the serpentine bend 201 to form water droplets and flow back into the exhaust pipe 104. In one embodiment, refer to Figure 1 The rear end of the outer tube 3 is set lower than the front end of the outer tube 3, and the serpentine bend 201 is set obliquely along the axial direction of the outer tube 3, so that the water droplets formed by condensation on the inner wall of the serpentine bend 201 can flow out from the end of the serpentine bend 201 away from the exhaust pipe 104. Figure 1 The other end of the serpentine bend 201 is connected to one side of a vertically arranged guide pipe 9, the water outlet pipe 302 is connected to the side of the guide pipe 9, and the bottom of the guide pipe 9 is connected to a water storage tank 10. Through this arrangement, the water condensed on the inner wall of the serpentine bend 201 and the water heated in the outer cylinder 3 can both flow downward through the guide pipe 9 into the water storage tank 10 for storage, and the smoke in the serpentine bend 201 is discharged through the top of the guide pipe 9.

[0036] For details, see Figure 3 , Figure 5 A pair of slide rails 304 are axially arranged on the inner side of the outer cylinder 3, and a pair of protrusions 403 are arranged on the outer side of the annular brush 4. The pair of protrusions 403 are slidably connected with the pair of slide rails 304 to limit the moving direction of the annular brush 4. For more details, refer to Fig.10 The linear mechanism includes a driving motor 5 and a screw rod 501. The screw rod 501 is rotatably arranged in a rectangular housing 6, and the axial direction of the screw rod 501 is parallel to the length direction of the rectangular housing 6. The rectangular housing 6 is arranged at the top of the outer cylinder 3, and the length direction of the rectangular housing 6 is parallel to the axial direction of the outer cylinder 3. The bottom of the rectangular housing 6 has a first strip groove 601, and the top of the outer cylinder 3 has a second strip groove 303 connected to the first strip groove 601. A vertical plate 402 is provided on the top of the annular brush 4, and the vertical plate 402 is threadedly connected to the screw rod 501. The output shaft of the driving motor 5 is connected to one end of the screw rod 501. The driving motor 5 controls the screw rod 501 to rotate forward and reverse alternately, so as to drive the annular brush 4 to move back and forth along the axial direction of the inner cylinder 2.

[0037] Preferably, see Figure 6 , Figure 7 A plurality of pairs of baffles 7 are arranged in a longitudinal direction in a connected manner end to end in the rectangular shell 6, and each pair of baffles 7 is hinged to two sides of the rectangular shell 6 respectively. A driving mechanism is arranged in the rectangular shell 6 for driving the baffles 7 to rotate. When any pair of baffles 7 rotates inward to form a preset angle with its symmetry plane, the pair of baffles 7 abut against each other to block the water vapor formed by the water in the outer cylinder 3. The distance between the pair of baffles 7 near the front end of the rectangular shell 6 and the inner side of the front end of the rectangular shell 6 matches the thickness of the vertical plate 402. Rectangular blocks 602 are arranged at the front ends of the interiors of both sides of the rectangular shell 6. When the vertical plate 402 abuts against the front end of the rectangular shell 6, the vertical plate 402 abuts against the two rectangular blocks 602, and the pair of baffles 7 near the rectangular block 602 abut against the rectangular block 602, and the pair of baffles 7 near the rear end of the rectangular shell 6 abut against the rear end of the outer cylinder 3 and the rear end of the rectangular shell 6. When there is no need to control the movement of the annular brush, the annular brush is placed at the front end of the rectangular housing 6, and the driving mechanism is controlled to drive multiple pairs of baffles 7 to rotate inward until they are in contact with each other, so that most of the steam generated by the water in the outer cylinder 3 can be blocked, and excessive water vapor can be prevented from contacting the screw 501 and affecting the service life of the screw 501. Specifically, when the baffle 7 rotates inward until it is in contact with each other, the baffle 7 is in a downward tilted state. In this way, the water vapor blocked by the baffle 7 can form water droplets on the baffle 7 and then move downward along the inclined baffle 7, and after being gathered, it falls into the water below, so that a large amount of water can be prevented from accumulating on the baffle 7.

[0038] Preferably, see Figure 7 A plurality of pairs of first springs 701 are arranged in an array along the length direction in the rectangular housing 6. The plurality of pairs of first springs 701 are respectively connected to the inner sides of the plurality of pairs of baffles 7. When any pair of baffles 7 abut against each other, the first springs 701 connected thereto are in a stretched state. Figure 8 , Fig. 9 The driving mechanism includes a pair of symmetrically arranged push blocks 8, which are connected by a rectangular slider 801. A vertical slide groove 4021 is provided on the vertical plate 402, and the rectangular slider 801 is slidably connected in the vertical slide groove 4021. The bottom of the push blocks 8 has an outer inclined surface 803 inclined upward. Fig.10 , Fig.11 When the push block 8 abuts against the bottom of the baffle 7 and continues to move forward, the push block 8 pushes the baffle 7 upward to abut against both sides of the vertical plate 402, see Fig. 9 , a second spring 802 is disposed in the vertical slide groove 4021, and the second spring 802 is connected to the rectangular slide block 801, see Fig.12 , a receiving groove 603 is provided on the inner side of the front end of the rectangular shell 6, which is used to receive a push block 8 near the front end of the rectangular shell 6. When the push block 8 completely enters the receiving groove 603, the inclined surface 803 at the bottom of the push block 8 abuts against the wall at the bottom of the receiving groove 603, the second spring 802 is in a compressed state, and a pair of baffles 7 near the front end of the rectangular shell 6 are in a mutually abutting state. In actual use, the screw rod 501 is driven to rotate by the driving motor 5, thereby driving the annular brush 4 and the push block 8 to move. After the inclined surface 803 at the bottom of the push block 8 abuts against the closed baffle 7, the baffle 7 will be pushed outward to an open state, so that the vertical plate 402 can pass between the opposite baffles 7. After the push block 8 and the vertical plate 402 pass, the baffle 7 will reset under the pulling force of the first spring 701 and rotate to an abutting state. When the annular brush 4 and the push block 8 rotate to the front end of the rectangular shell 6, the inclined surface 803 at the bottom of the push block 8 will be in the receiving groove. The push block 8 moves upward under the push of the wall at the bottom of the groove 603, so that the push block 8 away from the accommodating groove 603 moves downward synchronously to prevent it from blocking the baffle 7 close to the accommodating groove 603 from rotating inward. When the push block 8 is separated from the accommodating groove 603, the push block 8 will move upward under the push of the second spring 802 to push up the baffle 7 above it, so that the vertical plate 402 can pass through. Specifically, the elastic force of the second spring 802 can be set to be much greater than the elastic force of the first spring 701, so as to prevent the baffle 7 from pressing the push block 8 downward due to the elastic force of the first spring 701.

[0039] For details, see Fig.12 , Fig.13A pair of baffles 7 near the front end of the rectangular shell 6 are provided with connecting grooves 702 at one end facing the accommodating groove 603. A third spring 703 is provided in the connecting grooves 702, and an extension plate 704 is slidably provided in the connecting grooves 702. The extension plate 704 is connected to the spring. When the spring is in a natural state, the extension plate 704 extends out of the connecting groove 702, and the distance between the extension plate 704 and the front end of the rectangular shell 6 matches the thickness of the vertical plate 402, and can cooperate with the vertical plate 402 and the rectangular block 602 to prevent water vapor from entering the top of the rectangular shell 6 and contacting the screw rod 501. When the vertical plate 402 pushes the extension plate 704 to completely enter the connecting groove 702, a push block 8 near the accommodating groove 603 is outside the accommodating groove 603. At this time, a push block 8 away from the accommodating groove 603 will move to the maximum limit under the push of the second spring 802, pushing the push plate outward so that the vertical plate 402 can pass.

[0040] Preferably, see Figure 7 A plurality of pairs of baffle bars 604 are arranged in an array along the length direction in the rectangular shell 6. When the plurality of pairs of baffle plates 7 are rotated inwardly to abut against each other, the inner sides of the plurality of pairs of baffle plates 7 abut against the plurality of pairs of baffle bars 604 respectively, so as to limit the maximum inward rotation angle of the baffle plates 7 and avoid the baffle plates 7 from rotating inwardly too much, resulting in the relative baffle plates 7 being unable to abut against each other.

[0041] The above description is only a preferred embodiment of the present invention, and is not intended to be the only one or to limit the present invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A heating furnace capable of recovering waste heat, characterized in that: include: A furnace body (1) is provided with a partition (101) therein to divide the interior into an upper layer and a lower layer, wherein the upper layer is used to place items to be heated, and the interior of the lower layer is respectively connected to a fuel pipe (102), an air intake pipe (103), and a smoke exhaust pipe (104); The inner tube (2) has a serpentine curved pipe (201) arranged horizontally therein. The serpentine curved pipe (201) is arranged horizontally. Two ends of the serpentine curved pipe (201) respectively pass through two ends of the inner tube (2). One end of the serpentine curved pipe (201) is connected to one end of the smoke exhaust pipe (104) extending out of the furnace body (1). Heat transfer oil is arranged in the inner tube (2); The outer cylinder (3) is coaxially sleeved outside the inner cylinder (2); the front end and the rear end of the outer cylinder (3) are respectively connected to a water inlet pipe (301) and a water outlet pipe (302); an annular brush (4) is provided inside the outer cylinder (3) and slides along the axial direction; the annular brush (4) is driven by a linear mechanism; the annular brush (4) is sleeved outside the inner cylinder (2); and bristles (401) are provided on the inner side of the annular brush (4) and abut against the inner cylinder (2) and are used to brush away scale formed on the outer wall of the inner cylinder (2).

2. A heating furnace capable of recovering waste heat according to claim 1, characterized in that: The linear mechanism comprises a driving motor (5) and a screw (501); the screw (501) is rotatably arranged in a rectangular housing (6); the axial direction of the screw (501) is parallel to the length direction of the rectangular housing (6); the rectangular housing (6) is arranged at the top of the outer cylinder (3); the length direction of the rectangular housing (6) is parallel to the axial direction of the outer cylinder (3); the bottom of the rectangular housing (6) has a first strip groove (601); the top of the outer cylinder (3) has a second strip groove (303) connected to the first strip groove (601); a vertical plate (402) is arranged at the top of the annular brush (4); the vertical plate (402) is threadedly connected to the screw (501); and the output shaft of the driving motor (5) is connected to one end of the screw (501).

3. A heating furnace capable of recovering waste heat according to claim 2, characterized in that: A plurality of pairs of baffles (7) are provided in a longitudinal direction of the rectangular shell (6), each pair of baffles (7) being hinged to two sides of the rectangular shell (6), and a driving mechanism is provided in the rectangular shell (6) for driving the baffles (7) to rotate. When any pair of baffles (7) rotates inward to form a preset angle with its symmetric surface, the pair of baffles (7) abut against each other to block water vapor generated by water in the outer cylinder (3); the pair of baffles (7) near the front end of the rectangular shell (6) is hinged to the front end of the rectangular shell (6). The distance between the inner sides of the ends matches the thickness of the vertical plate (402), and the front ends of the interior of both sides of the rectangular shell (6) are provided with rectangular blocks (602). When the vertical plate (402) abuts against the front end of the rectangular shell (6), the vertical plate (402) abuts against the two rectangular blocks (602), and a pair of baffles (7) close to the rectangular blocks (602) abut against the rectangular blocks (602), and a pair of baffles (7) close to the rear end of the rectangular shell (6) abut against the rear end of the outer cylinder (3) and the rear end of the rectangular shell (6).

4. A heating furnace capable of recovering waste heat according to claim 3, characterized in that: When the opposing baffles (7) rotate inwards to abut against each other, the baffles (7) are in a downwardly tilted state.

5. The heating furnace capable of recovering waste heat according to claim 3, characterized in that: A plurality of pairs of first springs (701) are arranged in an array along the length direction in the rectangular shell (6), and the plurality of pairs of first springs (701) are respectively connected to the inner sides of the plurality of pairs of baffles (7). When any pair of baffles (7) abut against each other, the first springs (701) connected thereto are in a stretched state. The driving mechanism comprises a pair of symmetrically arranged push blocks (8), and the pair of push blocks (8) are connected via a rectangular slider (801). A vertical slide groove (4021) is provided on the vertical plate (402), and the rectangular slider (801) is slidably connected in the vertical slide groove (4021). The bottom of the push blocks (8) has an inclined surface (803) with the outer side inclined upward. When the push blocks (8) abut against the bottom of the baffle (7) and continue to abut against the bottom of the baffle (7), the push blocks (8) are in a stretched state. When moving forward, the push block (8) pushes the baffle plate (7) upward until it abuts against both sides of the vertical plate (402); a second spring (802) is provided in the vertical slide groove (4021), and the second spring (802) is connected to the rectangular slide block (801); a receiving groove (603) is provided on the inner side of the front end of the rectangular shell (6) for accommodating a push block (8) near the front end of the rectangular shell (6); when the push block (8) completely enters the receiving groove (603), the inclined surface (803) at the bottom of the push block (8) abuts against the wall at the bottom of the receiving groove (603), the second spring (802) is in a compressed state, and a pair of baffle plates (7) near the front end of the rectangular shell (6) are in a state of abutting against each other.

6. A heating furnace capable of recovering waste heat according to claim 5, characterized in that: A pair of baffles (7) near the front end of the rectangular shell (6) are provided with a connecting groove (702) at one end facing the accommodating groove (603), and a third spring (703) is provided in each of the connecting grooves (702). An extension plate (704) is slidably provided in each of the connecting grooves (702). The extension plate (704) is connected to the spring. When the spring is in a natural state, the extension plate (704) extends out of the connecting groove (702), and the distance between the extension plate (704) and the front end of the rectangular shell (6) matches the thickness of the vertical plate (402). When the vertical plate (402) pushes the extension plate (704) to completely enter the connecting groove (702), a push block (8) near the accommodating groove (603) is outside the accommodating groove (603).

7. The heating furnace capable of recovering waste heat according to claim 1, characterized in that: The height of the rear end of the outer cylinder (3) is lower than the height of the front end of the outer cylinder (3), and the serpentine curved pipe (201) is arranged obliquely along the axial direction of the outer cylinder (3).

8. The heating furnace capable of recovering waste heat according to claim 7, characterized in that: The other end of the serpentine curved pipe (201) is in communication with one side of a vertically arranged guide pipe (9), the water outlet pipe (302) is in communication with the side of the guide pipe (9), and the bottom of the guide pipe (9) is connected to a water storage tank (10).

9. The heating furnace capable of recovering waste heat according to claim 5, characterized in that: A plurality of pairs of baffles (604) are arranged in an array along the length direction in the rectangular shell (6) for limiting the maximum angle of inward rotation of the baffle plate (7); when the plurality of pairs of baffle plates (7) are rotated inward to abut against each other, the inner sides of the plurality of pairs of baffle plates (7) abut against the plurality of pairs of baffle bars (604) respectively.

10. The heating furnace capable of recovering waste heat according to claim 1, characterized in that: A pair of slide rails (304) are axially arranged on the inner side of the outer cylinder (3), and a pair of protrusions (403) are arranged on the outer side of the annular brush (4). The pair of protrusions (403) are slidably connected to the pair of slide rails (304).

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