CN113028843A

CN113028843A - Industrial furnace waste heat recovery device and working method thereof

Info

Publication number: CN113028843A
Application number: CN202110266308.0A
Authority: CN
Inventors: 陈俊; 李慧; 宋永献; 龚成龙; 张元良
Original assignee: Marine Resources Development Institute Of Jiangsu (lianyungang); Supezet Jingjiang Equipment Manufacturing Co ltd
Current assignee: Marine Resources Development Institute Of Jiangsu (lianyungang); Supezet Jingjiang Equipment Manufacturing Co ltd
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2021-06-25

Abstract

The invention discloses an industrial furnace waste heat recovery device and a working method thereof, and relates to the technical field of industrial production. The waste heat recovery box and the secondary combustion box are arranged in the waste heat recovery box, the waste heat recovery box can recover and treat the smoke discharged by the main industrial furnace through the smoke inlet pipe, and the smoke can penetrate through the heat recovery plate through the smoke through pipe after entering the waste heat recovery box, so that the heat is transferred to cold water in the heat recovery plate, and the heat of the smoke is recovered.

Description

Industrial furnace waste heat recovery device and working method thereof

Technical Field

The invention relates to the technical field of industrial production, in particular to an industrial furnace waste heat recovery device and a working method thereof.

Background

Industrial furnaces are thermal devices that heat materials or workpieces by using heat generated by burning fuel or converting electric energy in industrial production. The industrial furnaces are divided into two types according to the heat supply mode: one is a flame furnace, which heats a workpiece with the combustion heat of solid, liquid or gaseous fuel in the furnace; the second type is an electric furnace in which electric energy is converted into heat for heating. When solid, liquid or gaseous fuels are used, a large amount of flue gas is generated, the flue gas contains a large amount of heat, and some flue gas also contains incompletely combusted particles and waste gas.

Through search, the Chinese patent discloses a flue gas heat recovery boiler (publication number: CN110553393A), wherein a furnace cover of the boiler is covered at the top end of a furnace body to form a cavity; the bottom of the inner cavity of the furnace body is used for containing boiler water; the bottom of an inner cavity of the furnace body is provided with a heating cavity, the heating cavity is immersed in boiler water, fuel is combusted in the heating cavity to generate heat, the boiler water in the furnace body is heated, the top end of the heating cavity is provided with a flue gas outlet, and flue gas generated after combustion is upwards discharged from the flue gas outlet; a heat exchange cavity for containing boiler water is arranged in the furnace cover, a chimney penetrates through the furnace cover, and the outer wall of the chimney can be in contact with the boiler water in the heat exchange cavity; when the flue gas flows through the chimney, the flue gas exchanges heat with boiler water in the furnace cover to absorb heat carried by the flue gas; the boiler body is connected with the heat exchanger, and boiler water in the boiler body flows into the heat exchange cavity through the heat exchanger and exchanges heat with system water to heat the system water.

The existing flue gas heat recovery device is single in recovery mode, and poor in heat interaction efficiency, so that heat loss in flue gas is large, and a large amount of incompletely combusted particles and waste gas in the flue gas cannot be effectively reused.

Disclosure of Invention

In order to overcome the technical problems that the existing flue gas heat recovery device is single in recovery mode and poor in heat interaction efficiency, so that heat loss in flue gas is large, and a large amount of incompletely combusted particles and waste gas in the flue gas cannot be effectively reused, the invention aims to provide an industrial furnace waste heat recovery device and a working method thereof, which are used for solving the following problems:

1. how to effectively prolong the contact time and the contact area between the flue gas and the cold water so as to improve the heat transfer efficiency of the flue gas;

2. how to reduce particles which are not completely combusted in the smoke and combustible harmful gas in the smoke, thereby reducing the pollution of the smoke.

The purpose of the invention can be realized by the following technical scheme:

an industrial furnace waste heat recovery device comprises a waste heat recovery box and a secondary combustion box, wherein a combustion chamber and a heating chamber are sequentially arranged in the secondary combustion box from bottom to top, an air blower, a steam discharge pipe, a water inlet pipe and a waste gas discharge pipe are arranged on the waste heat recovery box, the air blower and the waste gas discharge pipe are communicated with the combustion chamber, the steam discharge pipe and the water inlet pipe are communicated with the heating chamber, a detection window is fixedly connected to the side surface of the waste heat recovery box, a protective film is arranged on one side, close to the detection window, in the waste heat recovery box, the bottom of the waste heat recovery box is fixedly connected with a smoke inlet pipe, water dispersion plates are fixedly connected to the two sides of the waste heat recovery box, connecting pipes are fixedly connected to one sides of the water dispersion plates, a smoke recovery pipe and a secondary recovery pipe are fixedly connected between the waste heat recovery box and the secondary combustion box, and an air inlet of the smoke recovery pipe, and the gas outlet of the flue gas recovery pipe and the gas inlet of the secondary recovery pipe are communicated with the combustion chamber, the gas outlet of the secondary recovery pipe is communicated with the waste heat recovery box, the inside of the waste heat recovery box is fixedly connected with a plurality of horizontal heat recovery plates, and the two ends of each heat recovery plate are respectively communicated with the two groups of water dispersing plates.

As a further scheme of the invention: the utility model discloses a protection film, including protection film, surplus heat recovery case, second wind-up roll and first wind-up roll, surplus heat recovery case side is close to the downside fixedly connected with receiver of inspection window, and surplus heat recovery case side is close to the upside fixedly connected with wind-up box of inspection window, the inside of wind-up box is rotated and is connected with the second wind-up roll, and the first driving motor of one side fixedly connected with of wind-up box, first driving motor's output runs through wind-up box and second wind-up roll fixed connection, the inside of receiver is rotated and is connected with first wind-up roll, the outside at first wind-up roll both ends all overlaps and is equipped with first coil spring, two sets of first coil spring's both ends respectively with receiver and first wind-up roll fixed connection, surplus heat recovery case and second wind-up roll and first wind-.

As a further scheme of the invention: the device comprises a waste heat recovery box, a plurality of first fixing frames, a plurality of second fixing frames, a pressing roller and a connecting ball, wherein the first fixing frames are fixedly connected to two sides of the interior of the waste heat recovery box close to the waste heat recovery box;

the both sides edge of protective film imbeds respectively in two sets of a plurality of the downside of compression roller, and the both sides of protective film overlap respectively and establish two sets of a plurality of the upside of connecting the ball.

As a further scheme of the invention: the inside of heating chamber is provided with a plurality of heating ring, a plurality of heating ring longitudinal arrangement, and a plurality of fixedly connected with a plurality of communicating pipe between the heating ring, a plurality of the position homogeneous phase intercommunication that is connected with each heating ring communicating pipe, and a plurality of the bottom of communicating pipe all extends to the inside of combustion chamber and communicates with the combustion chamber.

As a further scheme of the invention: the inside bottom of waste heat recovery case is rotated and is connected with the rotating turret, a plurality of stirring roller of outside fixedly connected with of rotating turret, and the rotating turret outside is close to the downside fixedly connected with connection pad of stirring roller, one side fixedly connected with support frame that the inside bottom of waste heat recovery case is close to the rotating turret, and one side fixedly connected with third driving motor of waste heat recovery case, the inside rotation of support frame is connected with the driving frame, the one end and the connection pad transmission of driving frame are connected, and the other end of driving frame runs through waste heat recovery case and is connected with third driving motor's output transmission.

As a further scheme of the invention: the inside of each heat recovery plate is provided with a communicating groove, the inside of each heat recovery plate is fixedly connected with a smoke through pipe, the upper end and the lower end of each smoke through pipe are respectively communicated with the upper side and the lower side of each heat recovery plate, and a plurality of smoke through pipes in adjacent heat recovery plates are arranged in a staggered mode;

the plurality of smoke through pipes are all spiral components;

the outer sides of the two groups of connecting pipes are wrapped with heat insulation sleeves.

As a further scheme of the invention: the upper surface of secondary recovery pipe fixedly connected with second driving motor, and secondary recovery pipe upper surface is close to one side fixedly connected with double support of second driving motor, second driving motor's output passes through shaft coupling fixedly connected with coiler, the coiling has the connection rope in the winding of the coiler outside, the inside of double support is rotated and is connected with two sets of connection rollers that arrange from top to bottom, the connection rope runs through the middle part of two sets of connection rollers.

As a further scheme of the invention: the gas outlet of secondary recovery pipe extends to the inside of waste heat recovery case, and the upside fixedly connected with turning block of secondary recovery pipe gas outlet, the turning block rotates through the iron shaft and is connected with the shielding plate, and the both ends of iron shaft all overlap and are equipped with second coil spring, two sets of second coil spring's both ends respectively with the both sides fixed connection of iron shaft and shielding plate, the last fixed surface of shielding plate is connected with the support ball, and the bottom fixedly connected with fixed block of shielding plate side, the one end that the winder was kept away from to the connection rope extends to the inside of waste heat recovery case and crosses support ball and fixed block fixed connection.

The invention also discloses a working method of the industrial furnace waste heat recovery device, which comprises the following steps:

the method comprises the following steps: cold water is injected into the heat recovery plate through a group of connecting pipes and the water dispersion plate, flue gas with waste heat is injected into the waste heat recovery box through the smoke inlet pipe, fuel is added into a combustion chamber in the secondary combustion box, and then the cold water is injected into the heating chamber through the water inlet pipe;

step two: the smoke passes through the smoke passing pipes of the heat recovery plates of each layer, and when the smoke passes through the smoke passing pipes, heat transfer is carried out on cold water in the heat recovery plates;

step three: after passing through each layer of heat recovery plate, the flue gas enters a combustion chamber in the secondary combustion box along a flue gas recovery pipe, a blower is started, the combustion chamber starts to burn, cold water in a heating chamber is heated, and the flue gas generated by heating in the combustion chamber enters each heating ring through a communicating pipe to heat the cold water;

step four: the second driving motor is started, the second driving motor drives the winder to rotate, the winder rotates and then winds the connecting rope, the connecting rope winds the connecting rope and drives the shielding plate to unfold, the secondary recovery pipe is communicated with the waste heat recovery box, the fan on the secondary recovery pipe is started, the smoke in the combustion chamber is blown to the waste heat recovery box, the third driving motor is started and drives the rotating frame and the stirring roller to rotate through the transmission frame, and the smoke inlet pipe and the smoke outlet pipe are mixed.

As a further scheme of the invention: the method for replacing the protective film comprises the following steps:

s1: starting a first driving motor, driving a second winding roller in the winding box to rotate by the first driving motor, and winding the protective film after the second winding roller rotates;

s2: the bottom of the protective film is tightly driven by first spiral springs at two ends of a first winding roller, the protective film is attached to one side of the inspection window, and two sides of the protective film are pressed on the inner wall of the waste heat recovery box through two groups of a plurality of compression rollers;

s3: through connecting the ball, leave the space between middle part and waste heat recovery case and the inspection window of protective film, the compression roller rotates with first mount and second mount respectively with connecting the ball simultaneously, reduces the frictional force when protective film removes.

The invention has the beneficial effects that:

the waste heat recovery box and the secondary combustion box are arranged, the waste heat recovery box can recover and treat the smoke discharged by the main industrial furnace through the smoke inlet pipe, the smoke can penetrate through the heat recovery plate through the smoke through pipe after entering the waste heat recovery box, so that the heat is transferred to cold water in the heat recovery plate, the heat of the smoke is recovered, and the smoke through pipe is in a spiral shape, so that the contact area and the contact time with the heat recovery pipe can be prolonged;

meanwhile, the secondary combustion box can be used for carrying out secondary combustion by matching flue gas with fuel, the main industrial furnace is assisted by adopting a boiler mode, and the flue gas in the secondary combustion box can be guided into the heating chamber through the heating ring and the communicating pipe, so that the heating efficiency in the heating chamber is improved;

on the other hand, after the secondary recovery pipe is opened, the flue gas in the combustion chamber can be secondarily recovered, and the waste heat recovery tank is heated, so that incompletely combusted particles and waste gas in the flue gas discharged by the combustion chamber can be reduced, and the effects of protecting the environment and improving the utilization rate are achieved;

simultaneously, the flue gas temperature of retrieving in waste heat recovery case when certain extent, through the protecting film, can protect the inspection window to make things convenient for the staff to observe the inside of waste heat recovery case through the inspection window, and the protecting film can remove under the drive of receiver and coiling box, thereby can prevent that the flue gas from causing the pollution to the protecting film, lead to the problem of observing the sight reduction.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the mounting structure of the pellicle of the present invention;

FIG. 3 is a schematic view of a support structure for a protective film according to the present invention;

FIG. 4 is a sectional view of a secondary combustion chamber in the present invention;

FIG. 5 is a schematic view of a waste heat recovery tank of the present invention;

FIG. 6 is a partial cross-sectional view of a heat recovery panel according to the present invention;

FIG. 7 is an enlarged view of the structure of portion A of FIG. 1 in accordance with the present invention;

fig. 8 is an enlarged view of the structure of portion B of fig. 5 according to the present invention.

In the figure: 1. a waste heat recovery tank; 2. a secondary combustion chamber; 3. a combustion chamber; 4. a heating chamber; 5. a smoke inlet pipe; 6. a water-dispersing plate; 7. a connecting pipe; 8. a flue gas recovery pipe; 9. a secondary recovery pipe; 10. a heat recovery plate; 11. a viewing window; 12. a protective film; 13. a heating ring; 14. a communicating pipe; 15. a steam discharge pipe; 16. a water inlet pipe; 17. an exhaust gas discharge pipe; 18. a blower; 19. a storage box; 20. a coiling box; 21. a first drive motor; 22. a first wind-up roll; 23. a first fixing frame; 24. a compression roller; 25. a second fixing frame; 26. a connecting ball; 27. a second drive motor; 28. a winder; 29. a double-layer bracket; 30. a connecting roller; 31. connecting ropes; 32. rotating the block; 33. a shielding plate; 34. a fixed block; 35. a second wind-up roll; 36. a support ball; 37. a rotating frame; 38. a stirring roller; 39. a connecting disc; 40. a transmission frame; 41. a support frame; 42. a third drive motor; 101. a communicating groove; 102. a smoke pipe is communicated.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, an industrial furnace waste heat recovery device comprises a waste heat recovery box 1 and a secondary combustion box 2, wherein a combustion chamber 3 and a heating chamber 4 are sequentially arranged in the secondary combustion box 2 from bottom to top, a blower 18, a steam discharge pipe 15, a water inlet pipe 16 and a waste gas discharge pipe 17 are arranged on the waste heat recovery box 1, the blower 18 and the waste gas discharge pipe 17 are communicated with the combustion chamber 3, the steam discharge pipe 15 and the water inlet pipe 16 are communicated with the heating chamber 4, a detection window 11 is fixedly connected to the side surface of the waste heat recovery box 1, a protective film 12 is arranged on one side of the waste heat recovery box 1 close to the detection window 11, a smoke inlet pipe 5 is fixedly connected to the bottom of the waste heat recovery box 1, water-dispersing plates 6 are fixedly connected to both sides of the waste heat recovery box 1, connecting pipes 7 are fixedly connected to one sides of the two water-dispersing plates 6, a smoke recovery pipe 8 and a secondary recovery pipe 9 are fixedly connected between the waste, the air inlet of flue gas recovery pipe 8 and the top fixed connection of rolling box 20, and the gas outlet of flue gas recovery pipe 8 and the air inlet of secondary recovery pipe 9 all communicate with combustion chamber 3, and the gas outlet and the waste heat recovery case 1 intercommunication of secondary recovery pipe 9, the inside fixedly connected with a plurality of horizontally heat recovery board 10 of waste heat recovery case 1, the both ends of a plurality of heat recovery board 10 communicate with two sets of cooling plates 6 respectively.

A storage box 19 is fixedly connected to the lower side, close to the inspection window 11, of the side face of the waste heat recovery box 1, a winding box 20 is fixedly connected to the upper side, close to the inspection window 11, of the side face of the waste heat recovery box 1, a second winding roller 35 is rotatably connected to the inside of the winding box 20, a first driving motor 21 is fixedly connected to one side of the winding box 20, the output end of the first driving motor 21 penetrates through the winding box 20 and is fixedly connected with the second winding roller 35, a first winding roller 22 is rotatably connected to the inside of the storage box 19, first spiral springs are sleeved on the outer sides of two ends of the first winding roller 22, two ends of the two groups of first spiral springs are fixedly connected with the storage box 19 and the first winding roller 22 respectively, and the upper end and the lower end of the protective film 12 penetrate through the waste heat recovery box 1 and are fixedly connected with the second winding roller;

a plurality of first fixing frames 23 are fixedly connected to two sides of the interior of the waste heat recovery tank 1 close to the waste heat recovery tank 1, a plurality of second fixing frames 25 are fixedly connected between two groups of the plurality of first fixing frames 23 and the inspection window 11, the interior of the waste heat recovery tank 1 close to the interior of the two groups of the plurality of first fixing frames 23, the plurality of first fixing frames 23 and the plurality of second fixing frames 25 are both L-shaped components, the outer sides of the plurality of first fixing frames 23 are rotatably connected with compression rollers 24, and the outer sides of the plurality of second fixing frames 25 are rotatably connected with connecting balls 26;

the edges of two sides of the protective film 12 are respectively embedded into the lower sides of the two groups of the plurality of press rollers 24, and the two sides of the protective film 12 are respectively sleeved on the upper sides of the two groups of the plurality of connecting balls 26.

The inside of heating chamber 4 is provided with a plurality of heating ring 13, a plurality of heating ring 13 longitudinal arrangement, and a plurality of communicating pipe 14 of fixedly connected with between a plurality of heating ring 13, and the position homogeneous phase that a plurality of communicating pipe 14 and each heating ring 13 are connected communicates, and the bottom of a plurality of communicating pipe 14 all extends to the inside of combustion chamber 3 and communicates with combustion chamber 3.

The bottom of waste heat recovery case 1 inside rotates and is connected with rotating turret 37, a plurality of stirring roller 38 of outside fixedly connected with of rotating turret 37, and the rotating turret 37 outside is close to the downside fixedly connected with connection pad 39 of stirring roller 38, one side fixedly connected with support frame 41 of rotating turret 37 is close to the inside bottom of waste heat recovery case 1, and one side fixedly connected with third driving motor 42 of waste heat recovery case 1, the inside of support frame 41 rotates and is connected with driving frame 40, the one end and the connection pad 39 transmission of driving frame 40 are connected, and the other end of driving frame 40 runs through waste heat recovery case 1 and is connected with the output transmission of third driving motor 42.

The inside of each heat recovery plate 10 is provided with a communicating groove 101, the inside of each heat recovery plate 10 is fixedly connected with a smoke through pipe 102, the upper end and the lower end of each smoke through pipe 102 are respectively communicated with the upper side and the lower side of each heat recovery plate 10, and the smoke through pipes 102 in the adjacent heat recovery plates 10 are arranged in a staggered mode;

the plurality of smoke tubes 102 are all spiral components;

the outer sides of the two groups of connecting pipes 7 are wrapped with heat insulation sleeves.

The upper surface of secondary recovery pipe 9 is fixedly connected with second driving motor 27, and secondary recovery pipe 9 upper surface is close to one side fixedly connected with double support 29 of second driving motor 27, and shaft coupling fixedly connected with coiler 28 is passed through to second driving motor 27's output, and the coiling ware 28 outside winding has connection rope 31, and double support 29's inside is rotated and is connected with two sets of connection rollers 30 that arrange from top to bottom, connects the middle part that rope 31 runs through two sets of connection rollers 30.

Gas outlet of secondary recovery pipe 9 extends to waste heat recovery case 1's inside, and the upside fixedly connected with turning block 32 of secondary recovery pipe 9 gas outlet, turning block 32 rotates through the iron shaft and is connected with shielding plate 33, the both ends of iron shaft all overlap and are equipped with second coil spring, two sets of second coil spring's both ends respectively with the both sides fixed connection of iron shaft and shielding plate 33, shielding plate 33's last fixed surface is connected with supporting ball 36, and the bottom fixedly connected with fixed block 34 of shielding plate 33 side, the one end that connects rope 31 and keep away from coiler 28 extends to waste heat recovery case 1's inside and crosses supporting ball 36 and fixed block 34 fixed connection.

The temperature of the recovered flue gas is not more than 350 ℃, the protective film 12 is made of PI materials, and the position of the inspection window 11 is higher than the height of the heat recovery plate 10 at the lowest layer, so that the problem that the protective film 12 deforms due to overlarge heat when the flue gas enters the waste heat recovery box 1 can be avoided, and the service life of the protective film can be prolonged.

The working method of the industrial furnace waste heat recovery device comprises the following steps:

the method comprises the following steps: cold water is injected into a heat recovery plate 10 through a group of connecting pipes 7 and a water dispersion plate 6, smoke with waste heat is injected into a waste heat recovery tank 1 through a smoke inlet pipe 5, fuel is added into a combustion chamber 3 in a secondary combustion tank 2, and then the cold water is injected into a heating chamber 4 through a water inlet pipe 16;

step two: the flue gas passes through the smoke through tubes 102 of the heat recovery plates 10 of the respective layers, and when passing through, the flue gas transfers heat to the cold water inside the heat recovery plates 10;

step three: after passing through each layer of heat recovery plate 10, the flue gas enters the combustion chamber 3 in the secondary combustion box 2 along the flue gas recovery pipe 8, the blower 18 is started, the combustion chamber 3 starts to burn, cold water in the heating chamber 4 is heated, and the flue gas generated by heating the interior of the combustion chamber 3 enters each heating ring 13 through the communicating pipe 14 to heat the cold water;

step four: the second driving motor 27 is started, the second driving motor 27 drives the winder 28 to rotate, the connecting rope 31 is wound after the winder 28 rotates, the connecting rope 31 drives the shielding plate 33 to unfold after being wound, the secondary recovery tube 9 is communicated with the waste heat recovery box 1, the fan on the secondary recovery tube 9 is started, the smoke in the combustion chamber 3 is blown into the waste heat recovery box 1, the third driving motor 42 is started, the third driving motor 42 drives the rotating frame 37 and the stirring roller 38 to rotate through the transmission frame 40, and the smoke fed into the smoke tube 5 is mixed with the smoke fed into the secondary recovery tube 9.

The working principle of the invention is as follows:

start first driving motor 21, first driving motor 21 drives the inside second wind-up roll 35 rotation of box 20, second wind-up roll 35 rotates the back, with protective film 12 rolling, the first coil spring at first wind-up roll 22 both ends can be taken the bottom of protective film 12 tight simultaneously, laminate protective film 12 in the one side of examining window 11, simultaneously through two sets of a plurality of compression roller 24, can suppress the both sides of protective film 12 on the inner wall of waste heat recovery case 1, simultaneously through connecting ball 26, can leave the space between the middle part of protective film 12 and waste heat recovery case 1 and the examining window 11, compression roller 24 and connecting ball 26 take place to rotate with first mount 23 and second mount 25 respectively simultaneously, thereby can reduce the frictional force when protective film 12 removes.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Claims

1. The utility model provides an industrial furnace waste heat recovery device, includes waste heat recovery case (1) and secondary combustion case (2), combustion chamber (3) and heating chamber (4) have been seted up from supreme down in proper order to the inside of secondary combustion case (2), and installs air-blower (18), steam delivery pipe (15), inlet tube (16) and waste gas delivery pipe (17) on waste heat recovery case (1), air-blower (18) and waste gas delivery pipe (17) and combustion chamber (3) intercommunication, steam delivery pipe (15) and inlet tube (16) communicate with heating chamber (4), the side fixedly connected with inspection window (11) of waste heat recovery case (1), its characterized in that, one side that waste heat recovery case (1) inside is close to inspection window (11) is installed protecting film (12), the bottom fixedly connected with of waste heat recovery case (1) advances tobacco pipe (5), and the equal fixedly connected with cooling plate (6) in both sides of waste heat recovery case (1), it is two sets of the equal fixedly connected with connecting pipe (7) in one side of cooling plate (6), fixedly connected with flue gas recovery pipe (8) and secondary recovery pipe (9) between waste heat recovery case (1) and secondary combustion case (2), the air inlet of flue gas recovery pipe (8) and the top fixed connection of rolling box (20), and the air outlet of flue gas recovery pipe (8) and the air inlet of secondary recovery pipe (9) all communicate with combustion chamber (3), the air outlet and waste heat recovery case (1) intercommunication of secondary recovery pipe (9), the inside fixedly connected with horizontal heat recovery board (10) of a plurality of, a plurality of the both ends of heat recovery board (10) communicate with two sets of cooling plate (6) respectively.

2. The industrial furnace waste heat recovery device according to claim 1, wherein a storage box (19) is fixedly connected to the side surface of the waste heat recovery box (1) close to the lower side of the inspection window (11), a winding box (20) is fixedly connected to the side surface of the waste heat recovery box (1) close to the upper side of the inspection window (11), a second winding roller (35) is rotatably connected to the inside of the winding box (20), a first driving motor (21) is fixedly connected to one side of the winding box (20), the output end of the first driving motor (21) penetrates through the winding box (20) and is fixedly connected with the second winding roller (35), a first winding roller (22) is rotatably connected to the inside of the storage box (19), first spiral springs are sleeved on the outer sides of two ends of the first winding roller (22), two ends of the two groups of first spiral springs are respectively and fixedly connected with the storage box (19) and the first winding roller (22), the upper end and the lower end of the protective film (12) penetrate through the waste heat recovery box (1) and are fixedly connected with the second winding roller (35) and the first winding roller (22) respectively.

3. The industrial furnace waste heat recovery device according to claim 2, wherein a plurality of first fixing frames (23) are fixedly connected to two sides of the interior of the waste heat recovery tank (1) close to the waste heat recovery tank (1), a plurality of second fixing frames (25) are fixedly connected to the interior of the waste heat recovery tank (1) close to two groups of the plurality of first fixing frames (23) and the inspection window (11), the plurality of first fixing frames (23) and the second fixing frames (25) are both L-shaped members, a press roller (24) is rotatably connected to the outer sides of the plurality of first fixing frames (23), and a connecting ball (26) is rotatably connected to the outer sides of the plurality of second fixing frames (25);

edges of two sides of the protective film (12) are respectively embedded into the lower sides of the two groups of the plurality of the press rollers (24), and the two sides of the protective film (12) are respectively sleeved on the upper sides of the two groups of the plurality of the connecting balls (26).

4. The waste heat recovery device of the industrial furnace according to claim 1, wherein a plurality of heating rings (13) are arranged inside the heating chamber (4), the plurality of heating rings (13) are longitudinally arranged, a plurality of communicating pipes (14) are fixedly connected between the plurality of heating rings (13), the connecting parts of the plurality of communicating pipes (14) and the heating rings (13) are communicated, and the bottom ends of the plurality of communicating pipes (14) extend to the inside of the combustion chamber (3) and are communicated with the combustion chamber (3).

5. The waste heat recovery device of the industrial furnace as claimed in claim 1, characterized in that a rotating frame (37) is rotatably connected to the bottom end inside the waste heat recovery tank (1), a plurality of stirring rollers (38) are fixedly connected with the outer side of the rotating frame (37), and the outer side of the rotating frame (37) is fixedly connected with a connecting disc (39) close to the lower side of the stirring roller (38), a supporting frame (41) is fixedly connected with one side of the bottom end in the waste heat recovery tank (1) close to the rotating frame (37), and one side of the waste heat recovery tank (1) is fixedly connected with a third driving motor (42), a transmission frame (40) is rotatably connected inside the supporting frame (41), one end of the transmission frame (40) is in transmission connection with the connecting disc (39), and the other end of the transmission frame (40) penetrates through the waste heat recovery tank (1) and is in transmission connection with the output end of the third driving motor (42).

6. The industrial furnace waste heat recovery device according to claim 1, wherein the inside of each of the plurality of heat recovery plates (10) is provided with a communicating groove (101), the inside of each of the plurality of heat recovery plates (10) is fixedly connected with a smoke through pipe (102), the upper end and the lower end of each of the plurality of smoke through pipes (102) are respectively communicated with the upper side and the lower side of each of the heat recovery plates (10), and the plurality of smoke through pipes (102) in the adjacent heat recovery plates (10) are arranged in a staggered manner;

the smoke passing pipes (102) are all spiral components;

the outer sides of the two groups of connecting pipes (7) are wrapped with heat insulation sleeves.

7. The industrial furnace waste heat recovery device according to claim 1, wherein a second driving motor (27) is fixedly connected to the upper surface of the secondary recovery pipe (9), a double-layer support (29) is fixedly connected to one side, close to the second driving motor (27), of the upper surface of the secondary recovery pipe (9), an output end of the second driving motor (27) is fixedly connected with a winding device (28) through a coupler, a connecting rope (31) is wound on the outer side of the winding device (28), two groups of connecting rollers (30) which are arranged up and down are rotatably connected to the inner portion of the double-layer support (29), and the connecting rope (31) penetrates through the middle portions of the two groups of connecting rollers (30).

8. The industrial furnace waste heat recovery device according to claim 7, wherein the air outlet of the secondary recovery pipe (9) extends to the interior of the waste heat recovery tank (1), and the upper side of the air outlet of the secondary recovery pipe (9) is fixedly connected with a rotating block (32), the rotating block (32) is rotatably connected with a baffle plate (33) through an iron shaft, the two ends of the iron shaft are respectively sleeved with a second spiral spring, the two ends of the two groups of second spiral springs are respectively fixedly connected with the iron shaft and the two sides of the baffle plate (33), the upper surface of the baffle plate (33) is fixedly connected with a supporting ball (36), and the bottom end fixedly connected with fixed block (34) of shielding plate (33) side, the one end that connects rope (31) and keep away from coiler (28) extends to the inside of waste heat recovery case (1) and crosses support ball (36) and fixed block (34) fixed connection.

9. An operating method of the industrial furnace waste heat recovery device according to any one of claims 1 to 8, characterized by comprising the steps of:

the method comprises the following steps: cold water is injected into a heat recovery plate (10) through a group of connecting pipes (7) and a water dispersing plate (6), flue gas with waste heat is injected into a waste heat recovery tank (1) through a flue gas inlet pipe (5), fuel is added into a combustion chamber (3) in a secondary combustion tank (2), and then cold water is injected into a heating chamber (4) through a water inlet pipe (16);

step two: smoke passes through the smoke passing pipes (102) of the heat recovery plates (10) of each layer, and when passing through, heat transfer is carried out on cold water inside the heat recovery plates (10);

step three: after passing through each layer of heat recovery plate (10), flue gas enters a combustion chamber (3) in the secondary combustion box (2) along a flue gas recovery pipe (8), a blower (18) is started, the combustion chamber (3) starts to burn, cold water in the heating chamber (4) is heated, and flue gas generated by heating the interior of the combustion chamber (3) enters each heating ring (13) through a communicating pipe (14) to heat the cold water;

step four: the second driving motor (27) is started, the second driving motor (27) drives the winder (28) to rotate, the connecting rope (31) is wound after the winder (28) rotates, the connecting rope (31) drives the shielding plate (33) to be unfolded after being wound, the secondary recovery pipe (9) is communicated with the waste heat recovery box (1), a fan on the secondary recovery pipe (9) is started, the smoke in the combustion chamber (3) is blown into the waste heat recovery box (1), the third driving motor (42) is started, the third driving motor (42) drives the rotating frame (37) and the stirring roller (38) to rotate through the transmission frame (40), and the smoke entering pipe (5) and the smoke conveyed by the secondary recovery pipe (9) are mixed.