Main furnace waste gas combustion waste heat recovery device of roller furnace

Abstract

The utility model discloses a main furnace waste gas combustion waste heat recovery device of a roller furnace, which comprises connecting discs arranged in the two ends of a heat exchange main body, a first end cover is arranged on one side of the heat exchange main body, a second end cover is arranged on the other side of the heat exchange main body, a heat exchange pipe is arranged in the heat exchange main body, and the first end cover and the second end cover are arranged in the heat exchange main body. The two ends of the heat exchange pipe are connected with the connecting discs in an inserted mode, a water inlet pipe is arranged at the lower end of the heat exchange body, and a water outlet pipe is arranged at the upper end of the heat exchange body. The air return pipe is arranged outside the heat exchange main body, an electromagnetic valve is arranged on the air return pipe, and the electromagnetic valve and the air return pipe are connected into a whole. According to the device, hot waste gas is injected into the heat exchange pipe, waste gas heat is absorbed and heated through a water body to achieve waste heat recovery, and the temperature of exhausted waste gas is measured; and when the temperature of exhausted waste gas is too high, the electromagnetic valve is opened, the waste gas is injected into the first end cover again through the gas return pipe, waste heat recovery is conducted on the waste gas again, and the heat energy recovery efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas recovery, in particular to a device for recovering waste heat from combustion of waste gas from a main furnace of a roller furnace. Background Art

[0002] A roller furnace, also known as a roller hearth kiln, is a device used to heat and harden materials. Its operating principle is to use the rotating motion of rollers to transfer heat, evenly heating the material across the roller surface, achieving the desired heating and hardening effect. This equipment uses the continuous rotation of the rollers to move the material forward, enabling continuous production. It is widely used in various industries, such as ceramics, metal heat treatment, and lithium battery material production.

[0003] China Patent Publication No. CN206362234U, authorization announcement date is July 28, 2017, a waste heat recovery system, its structure includes an air purifier, a water tank, an automatic device, a heat exchange furnace, the air purifier is fixedly connected to the heat exchange furnace, the water tank is fixedly connected to the heat exchange furnace, the automatic device is arranged on the water tank, the air purifier includes a plasma plug-in plate, the plasma plug-in plate is arranged on the air purifier, the water tank includes a water port, a hanging plate, the water tank is fixedly provided with a water port, the hanging plate is fixedly connected to the water tank, the automatic device includes a valve pipe, a control connecting rod, a controller, a temperature sensing rod, a sensor, and an induction joint. The utility model is a waste heat recovery system for waste gas, which is automated by providing an automatic device, a valve pipe, a controller, and a temperature sensing rod. The equipment realizes automatic water exchange and utilization by providing a valve pipe with a controller and a temperature sensing rod, which guarantees the problem of sufficient utilization of waste heat.

[0004] Existing furnace exhaust gas exchanges heat with the refrigerant through heat exchange tubes. When the exhaust gas is recovering waste heat, part of the heat in the exhaust gas is often lost due to insufficient heat exchange contact, resulting in energy waste, reducing heat recovery efficiency, and failing to meet usage needs. Utility Model Content

[0005] The purpose of the utility model is to provide a device for recovering the waste heat from the combustion of the main furnace exhaust gas of a roller furnace, so as to solve the problem proposed in the above background technology that the existing furnace exhaust gas is heat exchanged with the refrigerant through a heat exchange tube, and when the exhaust gas is recovering the waste heat, part of the heat in the exhaust gas is often lost due to insufficient heat exchange contact, resulting in energy waste, reducing the heat recovery efficiency, and failing to meet the use requirements.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a device for recovering waste heat from exhaust gas combustion in a roller furnace, comprising a heat exchange main body and:

[0007] A connecting disk is provided inside the two ends of the heat exchange body, two connecting disks are provided, and the connecting disks are fixedly connected to the heat exchange body, a first end cover is provided on one side of the heat exchange body, a second end cover is provided on the other side of the heat exchange body, and the first end cover and the second end cover are connected to the heat exchange body by screws, a heat exchange tube is provided inside the heat exchange body, at least sixteen heat exchange tubes are provided, and the heat exchange tubes are equidistantly arranged inside the heat exchange body, both ends of the heat exchange tube are plugged into the connecting disk, a water inlet pipe is provided at the lower end of the heat exchange body, a water outlet pipe is provided at the upper end of the heat exchange body, and the water inlet pipe and the water outlet pipe are connected to the heat exchange body as a whole;

[0008] The return air pipe is arranged outside the heat exchange main body, and the two ends of the return air pipe are respectively connected to the first end cover and the second end cover as a whole. The return air pipe is provided with a solenoid valve, and the solenoid valve is connected to the return air pipe as a whole.

[0009] Preferably, a dust filter box is provided at one end of the first end cover, and the dust filter box is connected to the first end cover by screws, an air intake valve is provided on one side of the dust filter box, and the air intake valve is connected to the dust filter box as a whole, and an exhaust valve is provided on one side of the second end cover, and the exhaust valve is connected to the second end cover as a whole.

[0010] Preferably, a first temperature sensor is provided on the outside of the first end cover, and the first temperature sensor is connected to the first end cover as a whole; a second temperature sensor is provided at the lower end of the heat exchange body, and the second temperature sensor is connected to the heat exchange body as a whole; a third temperature sensor is provided on the outside of the second end cover, and the third temperature sensor is connected to the second end cover as a whole.

[0011] Preferably, a baffle is provided inside the heat exchange body, at least three baffles are provided, and the baffles are equidistantly arranged inside the heat exchange body, the baffle is fixedly connected to the heat exchange body, and the cross-section of the baffle is semicircular, and the heat exchange tube and the baffle are connected.

[0012] Preferably, a sealing ring is provided at the connection between the heat exchange tube and the connecting disk, and the sealing ring and the connecting disk are connected as a whole. The sealing ring is provided on the outside of the heat exchange tube, and the sealing ring fits the heat exchange tube.

[0013] Preferably, a high-point exhaust valve is provided at the upper end of the heat exchange body, and the high-point exhaust valve is connected to the heat exchange body as a whole.

[0014] Preferably, anti-collision plates are provided at the bottom and top of the heat exchange body, two anti-collision plates are provided, and the anti-collision plates are fixedly connected to the heat exchange body, and the two anti-collision plates are respectively provided on one side of the water inlet pipe and the water outlet pipe.

[0015] Preferably, support seats are provided below both ends of the heat exchange body, and there are two support seats, which are fixedly connected to the heat exchange body. A slag discharge plug is provided at the lower end of the heat exchange body, and the slag discharge plug is threadedly connected to the heat exchange body. The lower end of the heat exchange body is inclined toward the slag discharge plug.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The utility model device is equipped with a return air pipe, a solenoid valve and a third temperature sensor. The third temperature sensor measures the exhaust gas temperature. When the exhaust gas temperature is too high, the solenoid valve is opened to allow the exhaust gas in the second end cover to flow into the first end cover through the return air pipe, thereby recycling the exhaust gas and improving the exhaust gas recovery efficiency.

[0018] 2. The utility model device is provided with a slag discharge plug and a high point exhaust valve. The high point exhaust valve is opened to discharge the air in the space, ensuring that water can fill the space outside the heat exchange tube in the entire heat exchanger shell, avoiding the formation of air blockage in the space outside the heat exchange tube, which causes water to fill the entire space. The slag discharge plug can be removed to discharge the scale accumulated at the bottom of the heat exchange body. Regular discharge can reduce the accumulation of fine impurities and improve heat exchange efficiency.

[0019] 3. The utility model device is equipped with baffles and anti-collision plates. The baffles make the water flow back outside the heat exchange tube, thereby increasing the heat exchange efficiency between the water and the heat exchange tube. The anti-collision plates prevent the heat exchange tube from being directly impacted by a large amount of water, which may cause the heat exchange tube to vibrate and deform, thereby protecting the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the main structural diagram of the utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of the connection between the first end cover and the heat exchange body of the utility model;

[0022] Figure 3 For the utility model Figure 2 A partial enlarged view of area A.

[0023] In the figure: 1. Heat exchange main body; 2. First end cover; 3. Second end cover; 4. Dust filter box; 5. Inlet valve; 6. Exhaust valve; 7. First temperature sensor; 8. Second temperature sensor; 9. Third temperature sensor; 10. Support seat; 11. Water inlet pipe; 12. Water outlet pipe; 13. Slag discharge plug; 14. High point exhaust valve; 15. Return air pipe; 16. Solenoid valve; 17. Baffle; 18. Heat exchange tube; 19. Connecting plate; 20. Sealing ring; 21. Anti-collision plate. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] See also Figure 1-3 The present invention provides an embodiment of a roller furnace main furnace exhaust gas combustion waste heat recovery device, comprising a heat exchange main body 1, and further comprising:

[0026] A connecting disk 19 is provided inside the two ends of the heat exchange body 1. Two connecting disks 19 are provided, and the connecting disks 19 are fixedly connected to the heat exchange body 1. A first end cover 2 is provided on one side of the heat exchange body 1, and a second end cover 3 is provided on the other side of the heat exchange body 1. The first end cover 2 and the second end cover 3 are connected to the heat exchange body 1 by screws. A heat exchange tube 18 is provided inside the heat exchange body 1. There are at least sixteen heat exchange tubes 18, and the heat exchange tubes 18 are equidistantly arranged inside the heat exchange body 1. Both ends of the heat exchange tube 18 are plugged into the connecting disk 19. A water inlet pipe 11 is provided at the lower end of the heat exchange body 1, and a water outlet pipe 12 is provided at the upper end of the heat exchange body 1. The water inlet pipe 11 and the water outlet pipe 12 are connected to the heat exchange body 1 as a whole;

[0027] The return air pipe 15 is arranged outside the heat exchange body 1, and both ends of the return air pipe 15 are respectively connected to the first end cover 2 and the second end cover 3 as a whole. The return air pipe 15 is provided with a solenoid valve 16, and the solenoid valve 16 is connected to the return air pipe 15 as a whole.

[0028] During use: the furnace exhaust gas is injected from the first end cover 2, and the waste gas flows into the heat exchange tube 18. Cold water is injected into the heat exchange body 1 from the water inlet pipe 11. The cold water wraps the hot heat exchange tube 18. The cold water absorbs the heat of the exhaust gas in the heat exchange tube 18 to increase the temperature of the water, thereby realizing heat recovery. The exhaust gas after heat exchange is then discharged from the second end cover 3. The solenoid valve 16 is opened to allow the exhaust gas in the second end cover 3 to flow into the first end cover 2 through the return air pipe 15, and the exhaust gas is recycled again to improve the exhaust gas recovery efficiency.

[0029] See also Figure 1 A dust filter box 4 is provided at one end of the first end cover 2, and the dust filter box 4 is connected to the first end cover 2 by screws. An air intake valve 5 is provided on one side of the dust filter box 4, and the air intake valve 5 is connected to the dust filter box 4 as a whole. An exhaust valve 6 is provided on one side of the second end cover 3, and the exhaust valve 6 is connected to the second end cover 3 as a whole. The exhaust gas injected into the first end cover 2 is filtered through the dust filter box 4 to remove impurities in the exhaust gas to prevent impurities from entering the heat exchange tube 18 and causing blockage.

[0030] See also Figure 1A first temperature sensor 7 is provided on the outside of the first end cover 2, and the first temperature sensor 7 is connected to the first end cover 2 as a whole. A second temperature sensor 8 is provided at the lower end of the heat exchange body 1, and the second temperature sensor 8 is connected to the heat exchange body 1 as a whole. A third temperature sensor 9 is provided on the outside of the second end cover 3, and the third temperature sensor 9 is connected to the second end cover 3 as a whole. The temperature of the injected exhaust gas is measured by the first temperature sensor 7, the temperature of the discharged exhaust gas is measured by the third temperature sensor 9, and the second temperature sensor 8 measures the water temperature in the heat exchange body 1.

[0031] See also Figure 2 A baffle 17 is provided inside the heat exchange main body 1. There are at least three baffles 17, and the baffles 17 are equidistantly arranged inside the heat exchange main body 1. The baffle 17 is fixedly connected to the heat exchange main body 1, and the cross-section of the baffle 17 is semicircular. The heat exchange tube 18 is connected to the baffle 17. The water body is turned back and flows outside the heat exchange tube 18 through the baffle 17, thereby increasing the heat exchange efficiency between the water body and the heat exchange tube 18.

[0032] See also Figure 2 and Figure 3 A sealing ring 20 is provided at the connection between the heat exchange tube 18 and the connecting disk 19, and the sealing ring 20 and the connecting disk 19 are connected as a whole. The sealing ring 20 is provided on the outside of the heat exchange tube 18, and the sealing ring 20 fits the heat exchange tube 18. The sealing ring 20 ensures the sealing of the connection between the heat exchange tube 18 and the connecting disk 19 to prevent water leakage.

[0033] See also Figure 1 A high-point exhaust valve 14 is provided at the upper end of the heat exchange main body 1, and the high-point exhaust valve 14 is connected to the heat exchange main body 1 as a whole. Open the high-point exhaust valve 14 to discharge the air in the space, ensuring that the water can fill the space outside the heat exchange tube 18 in the entire heat exchanger shell, avoiding the formation of air resistance in the space outside the heat exchange tube 18, so that the water fills the entire space, thereby improving the heat exchange efficiency.

[0034] See also Figure 2 and Figure 3 The bottom and top of the heat exchange main body 1 are both provided with anti-collision plates 21. There are two anti-collision plates 21, and the anti-collision plates 21 are fixedly connected to the heat exchange main body 1. The two anti-collision plates 21 are respectively arranged on one side of the water inlet pipe 11 and the water outlet pipe 12. The anti-collision plates 21 prevent the heat exchange tube 18 from being directly impacted by a large amount of water, which may cause the heat exchange tube to vibrate and deform, thereby protecting the heat exchange tube 18.

[0035] See also Figure 1A support base 10 is provided below both ends of the heat exchange main body 1. There are two support bases 10, and the support base 10 is fixedly connected to the heat exchange main body 1. A slag discharge plug 13 is provided at the lower end of the heat exchange main body 1, and the slag discharge plug 13 is threadedly connected to the heat exchange main body 1. The lower end of the heat exchange main body 1 is inclined toward the slag discharge plug 13. By removing the slag discharge plug 13, the scale accumulated at the bottom of the heat exchange main body 1 can be discharged, and regular discharge can be performed to reduce the accumulation of fine impurities.

[0036] Working principle: The furnace exhaust gas is injected from the first end cover 2, and the waste gas flows into the heat exchange tube 18. Cold water is injected into the heat exchange body 1 from the water inlet pipe 11. The cold water wraps the hot heat exchange tube 18. The cold water absorbs the heat of the exhaust gas in the heat exchange tube 18 to increase the temperature of the water. The exhaust gas after heat exchange is discharged from the second end cover 3 to achieve heat recovery; the first temperature sensor 7 measures the temperature of the injected exhaust gas, the second temperature sensor 8 measures the water temperature in the heat exchange body 1, and the third temperature sensor 9 measures the temperature of the discharged exhaust gas. When the temperature of the discharged exhaust gas is too high, the solenoid valve 16 is opened to discharge the exhaust gas in the second end cover 3 through the return pipe 15 flows into the first end cover 2, and the exhaust gas is recycled again to improve the exhaust gas recovery efficiency; the deflector 17 makes the water flow back outside the heat exchange tube 18, increasing the heat exchange efficiency between the water and the heat exchange tube 18, opening the high point exhaust valve 14 to discharge the air in the space, ensuring that the water can fill the space outside the heat exchange tube 18 in the entire heat exchanger shell, and the anti-collision plate 21 prevents the heat exchange tube 18 from being directly impacted by a large amount of water, causing the heat exchange tube to vibrate and deform, thereby protecting the heat exchange tube 18. Removing the slag discharge plug 13 can discharge the scale accumulated at the bottom of the heat exchange body 1, and regular discharge can be used to reduce the accumulation of fine impurities.

[0037] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0038] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A roller furnace main furnace exhaust gas combustion waste heat recovery device, comprising a heat exchange body (1), characterized in that: Also includes: A connecting plate (19) is provided inside the two ends of the heat exchange main body (1), two connecting plates (19) are provided, and the connecting plates (19) are fixedly connected to the heat exchange main body (1), a first end cover (2) is provided on one side of the heat exchange main body (1), and a second end cover (3) is provided on the other side of the heat exchange main body (1), and the first end cover (2) and the second end cover (3) are connected to the heat exchange main body (1) by screws, and the interior of the heat exchange main body (1) A heat exchange tube (18) is provided, and at least sixteen heat exchange tubes (18) are provided. The heat exchange tubes (18) are equidistantly arranged inside the heat exchange main body (1). Both ends of the heat exchange tube (18) are plugged into the connecting plate (19). A water inlet pipe (11) is provided at the lower end of the heat exchange main body (1), and a water outlet pipe (12) is provided at the upper end of the heat exchange main body (1). The water inlet pipe (11) and the water outlet pipe (12) are connected to the heat exchange main body (1) as a whole. A return air pipe (15) is arranged outside the heat exchange main body (1), and both ends of the return air pipe (15) are respectively connected to the first end cover (2) and the second end cover (3) as a whole. A solenoid valve (16) is provided on the return air pipe (15), and the solenoid valve (16) is connected to the return air pipe (15) as a whole.

2. The roller furnace main furnace exhaust gas combustion waste heat recovery device according to claim 1, characterized in that: A dust filter box (4) is provided at one end of the first end cover (2), and the dust filter box (4) is connected to the first end cover (2) via screws; an air intake valve (5) is provided on one side of the dust filter box (4), and the air intake valve (5) and the dust filter box (4) are connected as a whole; an exhaust valve (6) is provided on one side of the second end cover (3), and the exhaust valve (6) and the second end cover (3) are connected as a whole.

3. The roller furnace main furnace exhaust gas combustion waste heat recovery device according to claim 1, characterized in that: A first temperature sensor (7) is provided on the outside of the first end cover (2), and the first temperature sensor (7) is connected to the first end cover (2) as a whole; a second temperature sensor (8) is provided at the lower end of the heat exchange body (1), and the second temperature sensor (8) is connected to the heat exchange body (1) as a whole; a third temperature sensor (9) is provided on the outside of the second end cover (3), and the third temperature sensor (9) is connected to the second end cover (3) as a whole.

4. The roller furnace main furnace exhaust gas combustion waste heat recovery device according to claim 1, characterized in that: The heat exchange main body (1) is provided with a baffle (17) inside, at least three baffles (17) are provided, and the baffles (17) are arranged at equal intervals inside the heat exchange main body (1), the baffles (17) are fixedly connected to the heat exchange main body (1), and the cross section of the baffles (17) is arranged in a semicircular shape, and the heat exchange tube (18) is arranged to pass through the baffles (17).

5. The roller furnace main furnace exhaust gas combustion waste heat recovery device according to claim 1, characterized in that: A sealing ring (20) is provided at the connection between the heat exchange tube (18) and the connecting disk (19), and the sealing ring (20) and the connecting disk (19) are connected as a whole. The sealing ring (20) is provided outside the heat exchange tube (18), and the sealing ring (20) and the heat exchange tube (18) are in contact.

6. The roller furnace main furnace exhaust gas combustion waste heat recovery device according to claim 1, characterized in that: A high-point exhaust valve (14) is provided at the upper end of the heat exchange main body (1), and the high-point exhaust valve (14) is integrally connected to the heat exchange main body (1).

7. The roller furnace main furnace exhaust gas combustion waste heat recovery device according to claim 1, characterized in that: The bottom and top of the heat exchange main body (1) are both provided with anti-collision plates (21), two anti-collision plates (21) are provided, and the anti-collision plates (21) are fixedly connected to the heat exchange main body (1), and the two anti-collision plates (21) are respectively provided on one side of the water inlet pipe (11) and the water outlet pipe (12).

8. The roller furnace main furnace exhaust gas combustion waste heat recovery device according to claim 1, characterized in that: Support seats (10) are provided below both ends of the heat exchange main body (1), two support seats (10) are provided, and the support seats (10) are fixedly connected to the heat exchange main body (1), a slag discharge plug (13) is provided at the lower end of the heat exchange main body (1), and the slag discharge plug (13) is threadedly connected to the heat exchange main body (1), and the lower end of the heat exchange main body (1) is inclined toward the slag discharge plug (13).

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