Tail gas heat energy recovery system of heating furnace

Abstract

The tail gas heat energy recovery system comprises a heat collection module, and the heat collection module comprises a pipe seat, a sealing pipe vertically fixed to the top of the pipe seat, a pipe cover transversely fixed to an opening in the end of the sealing pipe, and a heat transfer pipe concentrically arranged in the sealing pipe. An annular cylindrical convection cavity is formed between the outer wall of the heat transfer pipe and the inner wall of the sealing pipe; the heat collecting module further comprises an air inducing pipe vertically arranged in the annular cylindrical convection cavity and located in front of the heat transfer pipe, an air inlet pipe transversely arranged on the front side of the sealing pipe in a penetrating and inserting mode, and an air outlet pipe transversely connected to the front side of the sealing pipe in an inserted mode, communicated with the interior of the annular cylindrical convection cavity and lower than the air inlet pipe. According to the utility model, the heating time of the furnace gun is effectively reduced, and the feeding speed of blanks is increased, so that the fuel consumption is greatly reduced to achieve the effects of energy conservation and environmental protection, the energy waste is effectively avoided, the production efficiency is effectively improved, and the potential safety hazard is eliminated.

Description

Technical Field

[0001] This application relates to the field of metal material heating equipment technology, specifically to a tail gas heat energy recovery system for a heating furnace. Background Technology

[0002] A heating furnace is a device (industrial furnace) that heats materials or workpieces (usually metals) to the rolling or forging temperature. Heating furnaces include continuous heating furnaces and chamber heating furnaces. In a continuous heating furnace, the furnace operates continuously. The billet is loaded from the furnace tail, which has a lower furnace temperature, and moves at a certain speed towards the furnace head, which has a higher furnace temperature, moving in the opposite direction to the hot gas in the furnace chamber. Continuous heating furnaces can be classified according to their heat source, such as fuel heating furnaces, resistance heating furnaces, induction heating furnaces, and microwave heating furnaces. However, regardless of the heat source used, after the metal is heated, it will produce a certain amount of waste gas, which mixes with the hot gas in the furnace chamber to form high-temperature exhaust gas, and is finally discharged to the outside.

[0003] Fuel-fired heating furnaces heat up quickly and are inexpensive, resulting in relatively low production costs. Furthermore, because solid fuels have poor fluidity, large volume, and are inconvenient to feed, gaseous fuels, such as liquefied petroleum gas (commonly known as coal gas) and natural gas, are the preferred choice.

[0004] Combustion of gaseous fuels in the heating lance of a furnace requires the participation of air. Existing fuel-fired furnaces directly introduce room temperature air into the heating lance. Since the base temperature of room temperature air is relatively low (calculated at an average of 20 degrees Celsius), in order to reach the target temperature of the billet, the heating time of the heating lance must be extended and the feeding speed of the metal segment must be slowed down. This is because the difference between the inlet air temperature and the outlet temperature is large, which consumes more fuel and also affects production efficiency. In addition, the high-temperature exhaust gas generated from the furnace is directly discharged, and the heat it carries is wasted, resulting in a very high temperature in the exhaust pipe. This is a serious waste of energy, and operators are prone to being burned by the exhaust pipe, posing a safety hazard. Further improvements are needed. Utility Model Content

[0005] In view of the current state of the prior art, the technical problem to be solved by this utility model is to provide a furnace exhaust heat recovery system that can absorb most of the heat carried in the high-temperature exhaust gas during the exhaust process and transfer the heat to the room temperature air that is about to enter the furnace gun to participate in fuel combustion. This effectively reduces the heating time of the furnace gun and accelerates the feeding speed of the billet, thereby greatly reducing fuel consumption to achieve energy saving and environmental protection. This effectively eliminates energy waste, improves production efficiency, and reduces the temperature of the exhaust pipe used to discharge high-temperature exhaust gas, thus eliminating safety hazards.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a tail gas heat energy recovery system for a heating furnace, characterized in that it includes a heat collection module, the heat collection module including a tube seat, a sealing tube vertically fixed to the top of the tube seat, a tube cover horizontally fixed to the opening at the end of the sealing tube, and a heat transfer tube concentrically arranged inside the sealing tube.

[0007] The upper opening of the heat transfer tube passes through the tube cover and extends above the tube cover. The lower opening of the heat transfer tube is fixed to the top of the tube seat. An annular cylindrical convection cavity is formed between the outer wall of the heat transfer tube and the inner wall of the sealing tube.

[0008] The heat collection module also includes an air intake pipe vertically disposed inside the annular cylindrical convection cavity and located in front of the heat transfer pipe, an air inlet pipe horizontally inserted in front of the sealing pipe, and an air outlet pipe horizontally inserted in front of the sealing pipe and communicating with the inside of the annular cylindrical convection cavity and being lower than the air inlet pipe.

[0009] The heat collection module also includes a gas guide pipe that is inserted and fixed in the tube seat. The upper end of the gas guide pipe passes through the top of the tube seat in a sealed manner and communicates with the interior of the lower end opening of the heat transfer tube.

[0010] Preferably, the upper end of the air duct is open and close to the duct cover, and the lower end of the air duct is closed.

[0011] Preferably, the rear opening of the air inlet pipe is sealed and inserted into the lower end of the air outlet pipe and communicates with the interior of the air outlet pipe.

[0012] Preferably, the root opening of the air outlet duct is close to the top of the duct seat.

[0013] Preferably, it also includes a high-temperature fan, the air outlet of which is connected to the front opening of the air inlet pipe.

[0014] Preferably, the heat collection module further includes a cylindrical heat insulation cover concentrically fitted outside the sealing tube, the lower opening of the cylindrical heat insulation cover being fixed to the top of the tube seat, and both the air inlet pipe and the air outlet pipe passing through the cylindrical heat insulation cover.

[0015] Preferably, the heat transfer tube is a metal corrugated tube.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] This invention absorbs most of the heat carried in the high-temperature exhaust gas during the exhaust process and transfers this heat to the room-temperature air that is about to enter the furnace lance to participate in fuel combustion. This significantly increases the base temperature of the room-temperature air. Then, a high-temperature fan sends the heated air into the furnace lance to participate in fuel combustion. This significantly reduces the difference between the inlet air temperature and the outlet temperature, thereby effectively reducing the heating time of the furnace lance and accelerating the feeding speed of the billet. This greatly reduces fuel consumption, achieving energy saving and environmental protection, effectively eliminating energy waste, and effectively improving production efficiency. In addition, it lowers the temperature of the exhaust pipe used to discharge high-temperature exhaust gas, and further reduces the heat radiated to the exhaust pipe by setting a cylindrical heat insulation cover. Even if the operator accidentally touches the exhaust pipe, they will not be burned, thus eliminating safety hazards. Attached Figure Description

[0018] The above and other features, advantages, and aspects of the embodiments of this application will become more apparent from the accompanying drawings and the following detailed description; throughout the drawings, the same or similar reference numerals denote the same or similar elements; it should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale; in the drawings:

[0019] Figure 1 This is an exploded top view of the right front side of this utility model.

[0020] Figure 2 This is a right-side cross-sectional view of the present invention.

[0021] Figure 3 This is a top-side structural diagram of the heat transfer tube of this utility model when a metal corrugated tube is used. Detailed Implementation

[0022] The embodiments of this application will now be described in more detail with reference to the accompanying drawings. Although some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the accompanying drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0023] It should be understood that the various steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown, and the scope of this application is not limited in this respect.

[0024] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the relevant definitions of other terms will be given in the description below.

[0025] It should be noted that the concepts of "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0026] It should be noted that the terms "a" and "a plurality of" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0027] like Figures 1-3 As shown, a tail gas heat energy recovery system for a heating furnace includes a heat collection module 2. The heat collection module 2 includes a tube seat 21, a sealing tube 22 vertically fixed to the top of the tube seat 21, a tube cap 27 horizontally fixed to the end opening of the sealing tube 22, and a heat transfer tube 23 concentrically disposed inside the sealing tube 22.

[0028] The upper opening of the heat transfer tube 23 passes through the tube cover 27 and extends above the tube cover 27. The lower opening of the heat transfer tube 23 is fixed to the top of the tube seat 21. An annular cylindrical convection cavity 29 is formed between the outer wall of the heat transfer tube 23 and the inner wall of the sealing tube 22.

[0029] The heat collection module 2 also includes an air duct 24 vertically disposed inside the annular cylindrical convection cavity 29 and located in front of the heat transfer tube 23, an air inlet duct 25 horizontally inserted in front of the sealing tube 22, and an air outlet duct 26 horizontally inserted in front of the sealing tube 22 and communicating with the interior of the annular cylindrical convection cavity 29 and being lower than the air inlet duct 25.

[0030] The upper end of the air duct 24 is open and close to the pipe cover 27, the lower end of the air duct 24 is closed, the rear end opening of the air inlet pipe 25 is sealed and inserted into the lower end of the air duct 24 and communicates with the interior of the air duct 24, and the root opening of the air outlet pipe 26 is close to the top of the pipe seat 21.

[0031] The heat collection module 2 also includes a gas guide pipe 210 that is inserted and fixed in the pipe seat 21. The upper end of the gas guide pipe 210 passes through the top of the pipe seat 21 and communicates with the lower end opening of the heat transfer pipe 23.

[0032] A tail gas heat recovery system for a heating furnace further includes a high-temperature fan 1, the outlet of which is connected to the front opening of the air inlet pipe 25.

[0033] The heat collection module 2 also includes a cylindrical heat insulation cover 28 concentrically sleeved outside the sealing tube 22. The lower opening of the cylindrical heat insulation cover 28 is fixed to the top of the tube seat 21. The air inlet pipe 25 and the air outlet pipe 26 both pass through the cylindrical heat insulation cover 28.

[0034] A groove 281 is provided on the front edge of the lower opening of the cylindrical heat insulation cover 28, through which both the air inlet pipe 25 and the air outlet pipe 26 are installed.

[0035] The heat transfer tube 23 is made of metal corrugated pipe.

[0036] Installation method:

[0037] The furnace body 3 includes an outer casing 31, a furnace chamber 32 located inside the outer casing 31, and a furnace gun 33 located on the front side of the outer casing 31. The nozzle of the furnace gun 33 is positioned rearward and aligned with the front opening of the furnace chamber 32. The high-temperature fan 1 and the pipe seat 21 are both fixed to the top of the outer casing 31 in the furnace body 3. The end opening of the air outlet pipe 26 is connected to the air inlet of the heating gun 33 in the furnace body 3. The lower end of the gas guide pipe 210 passes through the top of the outer casing 31 and the furnace chamber 32 and extends into the interior of the furnace chamber 32 so that the gas guide pipe 210 and the interior of the furnace chamber 32 are interconnected.

[0038] Working principle:

[0039] After the furnace lance 33 is ignited, it generates a high-temperature flame that is injected into the furnace chamber 32, thereby heating the metal section inside the furnace chamber 32. The high-temperature exhaust gas generated during the heating process enters the heat transfer tube 23 through the gas guide pipe 210, and then exits through the upper opening of the heat transfer tube 23. However, during the process of passing through the heat transfer tube 23, the heat of the high-temperature exhaust gas is transferred to the heat transfer tube 23. At the same time, after the high-temperature fan 1 is started, air will enter the induced draft pipe 24 under the action of the high-temperature fan 1, and then be blown towards the pipe cover through the upper opening of the induced draft pipe 24. 27. After being blocked by the pipe cover 27, the air flows downward and gradually fills the annular cylindrical convection cavity 29. Finally, it enters the air inlet of the furnace gun 33 through the air outlet pipe 26 to participate in the fuel combustion inside the furnace gun 33. During the downward circulation of the air inside the annular cylindrical convection cavity 29, the heat on the heat transfer pipe 23 is transferred to the air through the principle of thermal convection, thereby effectively increasing the temperature of the air entering the furnace gun 33 to participate in fuel combustion. This allows the furnace gun 33 to quickly heat the flame to a higher temperature with the same amount of fuel, thereby saving fuel consumption.

[0040] The advantage of using a metal corrugated tube for the heat transfer tube 23 is that the undulating outer circumference of the metal corrugated tube can be used to increase the contact area between the heat transfer tube 23 and the high-temperature exhaust gas to improve the heat absorption efficiency. At the same time, the undulating inner circumference of the metal corrugated tube can be used to increase the contact area between the heat transfer tube 23 and the air inside the annular cylindrical convection cavity 29 to improve the heating efficiency.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tail gas heat recovery system for a heating furnace, characterized in that, The device includes a heat collection module, which comprises a tube base, a sealing tube vertically fixed to the top of the tube base, a tube cap horizontally fixed to the opening at the end of the sealing tube, and a heat transfer tube concentrically disposed inside the sealing tube. The upper opening of the heat transfer tube passes through the tube cover and extends above the tube cover. The lower opening of the heat transfer tube is fixed to the top of the tube seat. An annular cylindrical convection cavity is formed between the outer wall of the heat transfer tube and the inner wall of the sealing tube. The heat collection module also includes an air intake pipe vertically disposed inside the annular cylindrical convection cavity and located in front of the heat transfer pipe, an air inlet pipe horizontally inserted in front of the sealing pipe, and an air outlet pipe horizontally inserted in front of the sealing pipe and communicating with the inside of the annular cylindrical convection cavity and being lower than the air inlet pipe. The heat collection module also includes a gas guide pipe that is inserted and fixed in the tube seat. The upper end of the gas guide pipe passes through the top of the tube seat in a sealed manner and communicates with the interior of the lower end opening of the heat transfer tube.

2. The tail gas heat energy recovery system of a heating furnace according to claim 1, characterized in that, The upper end of the air duct is open and close to the duct cover, while the lower end of the air duct is closed.

3. The tail gas heat energy recovery system of a heating furnace according to claim 2, characterized in that, The rear opening of the air inlet pipe is sealed and inserted into the lower end of the air outlet pipe and communicates with the interior of the air outlet pipe.

4. The tail gas heat energy recovery system of a heating furnace according to claim 1, characterized in that, The opening at the base of the air outlet duct is close to the top of the duct seat.

5. The tail gas heat energy recovery system of a heating furnace according to claim 3, characterized in that, It also includes a high-temperature fan, the outlet of which is connected to the front opening of the air inlet pipe.

6. The tail gas heat energy recovery system of a heating furnace according to claim 1, characterized in that, The heat collection module also includes a cylindrical heat insulation cover concentrically fitted outside the sealing tube. The lower opening of the cylindrical heat insulation cover is fixed to the top of the tube seat. Both the air inlet pipe and the air outlet pipe pass through the cylindrical heat insulation cover.

7. The tail gas heat energy recovery system of a heating furnace according to claim 1, characterized in that, The heat transfer tube is made of metal corrugated pipe.

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