A high-temperature heating furnace

Abstract

This invention discloses a high-temperature heating furnace, including a furnace base, a furnace body mounted on the furnace base, a porous medium burner disposed within the furnace base, and a pressure relief mechanism at the top of the furnace body. A heat insulation mechanism is disposed on the outer wall of the furnace body, and a heat exchange shell is disposed above the pressure relief mechanism. A heating chamber is disposed within the heat exchange shell and connected to the heat insulation mechanism. In use, when the pressure of the high-temperature flue gas inside the heating furnace reaches a certain level, it can be discharged through the pressure relief mechanism and the heat exchange shell, preventing the heating furnace body from rupturing. Furthermore, heat is recovered through the circulation of the heat exchange liquid, thereby insulating the furnace body, maintaining the heating efficiency of the furnace, extending its service life, and improving operational safety.

Description

Technical Field

[0001] This invention relates to the field of heating furnace technology, specifically a high-temperature heating furnace. Background Technology

[0002] Porous media combustion is a combustion method that incorporates porous media into the burner. Because porous media burners have three heat exchange mechanisms—convection, conduction, and radiation—the temperature in the combustion zone tends to be uniform, maintaining a relatively stable temperature gradient.

[0003] Publication No. CN109869719A discloses a high-temperature, high-pressure porous media burner, including a high-pressure gas inlet, an air inlet, a combustion chamber, a porous medium, an electronic ignition device, and a cooling chamber. The burner's combustion zone has a conical structure filled with a porous medium, where the mixed gas burns to produce high-temperature, high-pressure gas. Insulation layers are installed on the inner sides of the burner and cooling chamber. A cavity is left between the burner's outer wall and the cooling chamber, allowing cooling air to flow in from the bottom and out from the top. A pressure relief valve, a pressure regulating valve, and a pressure gauge are installed at the burner outlet. This design allows for the provision of a high-temperature, high-pressure working fluid to equipment such as gas turbines, achieving higher cycle thermal efficiency, reducing heat loss, saving energy, and reducing pollutant emissions.

[0004] The existing technology lacks effective insulation measures, and will result in huge energy waste due to pressure relief during use.

[0005] Publication No. CN218178872U discloses a regenerative porous medium burner, which includes a gas inlet pipe, a gas mixing chamber, a combustion chamber, and a preheating chamber. The gas inlet pipe, gas mixing chamber, preheating chamber, and combustion chamber are sequentially connected, and the preheating chamber is formed by surrounding the combustion chamber. This application, through the ingenious design of the preheating chamber, can preheat the gas while simultaneously providing thermal insulation to the combustion chamber, thus fully utilizing heat and saving energy.

[0006] The existing technology is prone to deformation due to the high temperature of the heating furnace during operation, and the slow flue gas flow rate results in low internal working efficiency of the heating furnace. When the flue gas inside the heating furnace reaches a certain level and cannot be discharged, the temperature at the top of the furnace and the pressure inside the furnace body rise sharply, which can easily cause the heating furnace to crack.

[0007] Publication (Announcement) No.: CN114234628A discloses a novel energy-saving heating furnace that uses a porous media burner. Specifically, it discloses a furnace body with a stepping conveyor. By dividing the furnace body into preheating and heating zones, and setting a porous media burner in the heating zone, flameless combustion is achieved. This makes the furnace chamber size smaller than that of a conventional flame furnace, allowing heat to be more easily concentrated during the heating process, resulting in better temperature uniformity, lower workpiece heating temperature, and reduced decarburization.

[0008] The existing technology is prone to deformation due to the high temperature of the heating furnace during operation, and the slow flue gas flow rate results in low internal working efficiency of the heating furnace. When the flue gas inside the heating furnace reaches a certain level and cannot be discharged, the temperature at the top of the furnace and the pressure inside the furnace body rise sharply, which can easily cause the heating furnace to crack.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of the present invention. Regarding the more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the Invention

[0010] In view of the above-mentioned defects in the existing technology, the purpose of this invention is to solve the problems that when the internal flue gas of the heating furnace reaches a certain level and cannot be discharged, the temperature at the top of the furnace and the internal pressure of the furnace body rise sharply, which can easily cause the heating furnace to crack, and the problem that a large amount of heat loss will occur during the process of discharging flue gas.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A high-temperature heating furnace includes a furnace base, a furnace body mounted on the furnace base, a porous medium burner disposed inside the furnace base, a pressure relief mechanism disposed on the top of the furnace body, a heat insulation mechanism disposed on the outer wall of the furnace body, a heat exchange shell disposed above the pressure relief mechanism, and a heating chamber disposed inside the heat exchange shell and connected to the heat insulation mechanism.

[0013] The heat preservation mechanism includes a liquid storage chamber disposed on the outer wall of the furnace body. The liquid storage chamber is connected to the heating pipe in the heating chamber through an inlet pipe, and the other end of the heating pipe is connected to the liquid storage chamber through an outlet pipe.

[0014] The heating tube is equipped with multiple containers to expand the heating area. The containers are fixed on the support mesh plate, which is connected to the heat exchange shell 4.

[0015] A water pump is installed on the inlet pipe.

[0016] A liquid injection pipe is installed on the liquid storage chamber, and a liquid injection valve is installed on the liquid injection pipe;

[0017] The liquid storage chamber is also equipped with a drain pipe, and the drain pipe is equipped with a drain valve.

[0018] The pressure relief mechanism includes a pressure relief hole on the top of the furnace body, and a pressure relief valve is provided below the pressure relief hole. The pressure relief valve includes a base, which is connected to the top of the furnace body via a fixing bracket.

[0019] A guide frame is also provided between the base and the heat exchange shell. A first sealing plug is installed on the guide frame. The upper part of the first sealing plug passes through the pressure relief hole, and the lower part of the carrier plate is connected to the guide frame.

[0020] The lower end of the inner wall of the heat exchange shell is provided with an annular groove, the diameter of which is larger than the diameter of the first sealing plug.

[0021] The bottom of the first sealing plug is provided with a countersunk air inlet, which is connected to the heating chamber through a through-hole-shaped branch hole provided on the upper outer wall.

[0022] A spring is fitted on the guide frame, and the two ends of the spring are fixedly connected to the top wall of the carrier plate and the furnace body, respectively. Under normal conditions, the inner wall of the heat exchange shell blocks the branch hole; when the first sealing plug moves upward to compress the spring, the branch hole communicates with the inside of the heat exchange shell through the pressure relief hole wall.

[0023] A top main pipe is installed above the furnace body. The top main pipe is connected to the liquid storage chamber through multiple connecting pipes. The top main pipe is connected to the heating pipe in the heating chamber through a second pipe. The heating pipe is connected to a first pipe. The first pipe is connected to a connecting pipe. A water pump is installed on the second pipe.

[0024] The heat exchange shell is provided with an exhaust hole at the top.

[0025] The heat exchange shell has an exhaust port at the top connected to an external exhaust pipe, which is fixedly installed on the heat exchange shell. The upper end of the external exhaust pipe is open, and a second sealing plug is provided inside the upper end opening of the external exhaust pipe. A switching mechanism is also installed on the heat exchange shell, which drives the second sealing plug to open and close the upper port of the external exhaust pipe.

[0026] The switching mechanism includes a support arm, which is fixedly connected to the heat exchange shell. A rotating shaft is mounted on the support arm, and a sector wheel is fixedly mounted on one end of the rotating shaft.

[0027] A guide rod is fixedly installed on the top of the second sealing plug, and a frame is fixedly installed on the upper end of the guide rod. The sector wheel is set inside the frame.

[0028] A motor is fixedly installed on the support arm, and the output shaft of the motor passes through the support arm and is fixedly connected to the rotating shaft.

[0029] The motor is equipped with a dust cover.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1) When the pressure of the high-temperature flue gas inside the heating furnace reaches a certain level, it can be discharged through the pressure relief valve and heat exchange shell, which is less likely to cause the heating furnace body to crack;

[0032] 2) Heat is recovered through the circulation of heat exchange liquid, which in turn keeps the furnace body warm, maintains the heating efficiency of the furnace, extends the service life of the furnace, and improves the safety of use. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a high-temperature heating furnace according to the present invention;

[0034] Figure 2 This is a schematic diagram of the half-section structure of the present invention;

[0035] Figure 3 This is a side view of the present invention;

[0036] Figure 4 For the present invention Figure 2 Schematic diagram of the heat exchange shell structure;

[0037] Figure 5 This is a schematic diagram of the internal structure of the heat exchange shell of the present invention.

[0038] In the diagram: 1. Furnace base; 2. Furnace body; 3. Liquid storage chamber; 4. Heat exchange shell; 5. Annular groove; 6. Support mesh plate; 7. First pipe; 7. Second pipe; 8. Heating pipe; 9. Container; 10. Water pump; 13. Guide frame; 14. Spring; 15. First sealing plug; 16. Air inlet; 17. Branch hole; 18. Outer pipe; 19. Second sealing plug; 20. Support arm; 21. Rotating shaft; 22. Sector wheel; 23. Guide rod; 24. Frame; 25. Motor; 26. Carrier plate; 31. Connecting pipe; 32. Top main pipe; 33. Base; 34. Fixing frame. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1 to 5A high-temperature heating furnace includes a furnace base 1, a furnace body 2 on the furnace base 1, a porous medium burner inside the furnace base 1, a pressure relief mechanism on the top of the furnace body 2, a heat insulation mechanism on the outer wall of the furnace body 2, a heat exchange shell 4 above the pressure relief mechanism, and a heating chamber inside the heat exchange shell 4 connected to the heat insulation mechanism.

[0041] Example 1:

[0042] The heat exchange shell 4 is provided with a heating chamber, and the heat preservation mechanism includes a liquid storage chamber 3 provided on the outer wall of the furnace body 2. The liquid storage chamber 3 is connected to the heating pipe 8 in the heating chamber through an inlet pipe, and the other end of the heating pipe 8 is connected to the liquid storage chamber through an outlet pipe.

[0043] The heating tube 8 is provided with multiple containers 9 to expand the heating area. The containers 9 are fixed on the support mesh plate 6, and the support mesh plate is fixed on the heat exchange shell 4.

[0044] A water pump 10 is installed on the inlet pipe;

[0045] The liquid storage chamber 3 is equipped with an injection pipe and an injection valve. A certain amount of heat exchange liquid is injected into the liquid storage chamber 3 through the injection valve, and the heat exchange liquid remains in the liquid storage chamber 3.

[0046] The liquid storage chamber 3 is also equipped with a drain pipe and a drain valve. The heat exchange liquid is drained through the drain valve so that a new heat exchange liquid can be replaced.

[0047] The pressure relief mechanism includes a pressure relief hole opened at the top of the furnace body 2, and a pressure relief valve is provided below the pressure relief hole. The pressure relief valve includes a base 33, which is connected to the top of the furnace body 2 through a fixing frame 34. A guide frame 13 is also provided between the base 33 and the heat exchange shell 4. A first sealing plug 15 is installed on the guide frame 13. The upper part of the first sealing plug 15 passes through the pressure relief hole, and the lower part of the carrier plate 26 is connected to the guide frame 13.

[0048] The heat exchange shell 4 is provided with an exhaust hole at the top so that the gas inside the heat exchange shell 4 can be discharged; the lower end of the inner wall of the heat exchange shell 4 is provided with an annular groove 5, the diameter of the annular groove 5 is larger than the diameter of the first sealing plug 15.

[0049] The bottom of the first sealing plug 15 is provided with a countersunk air inlet 16, and the air inlet 16 is connected to the heating chamber through a through-hole branch hole 17 provided on the upper outer wall.

[0050] A spring 14 is fitted on the guide frame 13. The two ends of the spring 14 are fixedly connected to the top wall of the carrier plate 26 and the furnace body 2, respectively. Under normal conditions, the inner wall of the heat exchange shell 4 blocks the branch hole 17. When the first sealing plug 15 moves upward to compress the spring 14, the branch hole 17 communicates with the inside of the heat exchange shell 4 through the pressure relief hole wall.

[0051] A top main pipe 32 is provided above the furnace body 2. The top main pipe 32 is connected to the liquid storage chamber 3 through multiple connecting pipes 31. The top main pipe is connected to the heating pipe 8 in the heating chamber through a second pipe 72. The heating pipe 8 is connected to the first pipe 7 to deliver the liquid. The first pipe 7 is connected to a connecting pipe 31.

[0052] The second pipe 72, part of the connecting pipe 31, and part of the top main pipe 32 serve as the liquid inlet pipe; the first pipe 7, part of the connecting pipe 31, and part of the top main pipe 32 serve as the liquid outlet pipe. A water pump 10 is installed on the second pipe 72.

[0053] The liquid storage chamber 3 is made of aluminum.

[0054] It should be noted that the functions of the inlet pipe and the outlet pipe are not strictly limited. The inlet pipe can also discharge liquid, and the outlet pipe can also discharge liquid. This embodiment is just a preferred best implementation method. This setting allows cold water to pass through the water pump 10, reducing the temperature of the water pump 10 and improving its service life. It can also be reversed when needed.

[0055] Specific work process:

[0056] When the volume of high-temperature flue gas inside the furnace body 2 increases and the furnace body 2 is under high pressure, the pressure of the high-temperature flue gas squeezes the first sealing plug 15. The first sealing plug 15 is subjected to upward extrusion force and moves upward, while the spring 14 is in a compressed state. When the multiple branch holes 17 move to the annular groove 5, the air inlet 16 is in communication with the annular groove 5 and the heat exchange shell 4 through the multiple branch holes 17. Thus, when the high-pressure flue gas inside the heating furnace is discharged into the heat exchange shell 4, it will not cause the heating furnace body to crack.

[0057] A certain amount of heat exchange liquid is injected into the storage chamber 3, and the heat exchange liquid remains in the storage chamber 3. When the high-temperature flue gas from the furnace body 2 is discharged into the heating chamber of the heat exchange shell 4 by the pressure relief mechanism, the heat exchange liquid in the storage chamber 3 is drawn in by the water pump 10 and then enters the heating tube 8. The heat exchange liquid in the heating tube 8 enters multiple containers 9. The high-temperature flue gas comes into contact with the multiple containers 9, which increases the contact area with the high-temperature flue gas, thereby causing the temperature of the heat exchange liquid in the containers 9 to rise rapidly. At the same time, the heat exchange liquid in the heating tube 8 is discharged through the first pipe 7 and returned to the storage chamber 3. During this process, the liquid temperature in the storage chamber 3 continues to rise, thereby recovering heat to keep the furnace body 2 warm. Meanwhile, the cooled exhaust gas is discharged through the exhaust port on the heat exchange shell 4.

[0058] Example 2:

[0059] Please see Figure 4 Based on Embodiment 1, the exhaust port at the top of the heat exchange shell 4 is connected to an external exhaust pipe 18. The external exhaust pipe 18 is fixedly installed on the heat exchange shell 4. The upper end of the external exhaust pipe 18 is open, and a second sealing plug 19 is provided inside the upper end opening of the external exhaust pipe 18. The second sealing plug 19 can block the upper port of the external exhaust pipe 18. A switching mechanism is also installed on the heat exchange shell 4. The switching mechanism drives the second sealing plug 19 to open and close the upper port of the external exhaust pipe 18, thereby constructing an intermittent pressure relief mechanism.

[0060] The switching mechanism includes a support arm 20, which is fixedly connected to the heat exchange shell 4. A rotating shaft 21 is rotatably mounted on the support arm 20. A fan-shaped wheel 22 is fixedly mounted on one end of the rotating shaft 21. A guide rod 23 is fixedly mounted on the top of the second sealing plug 19. A frame 24 is fixedly mounted on the upper end of the guide rod 23. Anti-slip textures are provided on both sides of the inner side of the frame 24. The fan-shaped wheel 22 is disposed inside the frame 24. When the fan-shaped wheel 22 rotates, its wheel edge contacts the inner sides of the frame 24 respectively. A motor 25 is fixedly mounted on the support arm 20. The output shaft of the motor 25 passes through the support arm 20 and is fixedly connected to the rotating shaft 21. A dust cover is installed on the motor 25.

[0061] Specific work process:

[0062] The sector-shaped wheel 22 is cut from a sector of a complete circle, so each rotation of the sector-shaped wheel 22 allows it to sequentially rub against the sides and top of the frame 24. When the arc of the sector-shaped wheel 22 contacts the top of the frame 24, the second sealing plug 19 reaches its highest point; when the arc of the sector-shaped wheel 22 faces the bottom of the frame 24, the second sealing plug 19 reaches its lowest point. This causes the frame 24 to drive the guide rod 23 up and down, thereby driving the second sealing plug 19 to intermittently open and close the upper port of the outer drain pipe 18. Obviously, the speed of the motor 25 determines the frequency of opening and closing of the upper port of the outer drain pipe 18. This arrangement ensures that the heated pipe 8 and the container 9 in the heating chamber are fully heated.

[0063] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0064] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-temperature heating furnace, comprising a furnace base, a furnace body disposed on the furnace base, and a porous medium burner disposed inside the furnace base; Its features are, The top of the furnace body is provided with a pressure relief mechanism; the outer wall of the furnace body is provided with a heat insulation mechanism; a heat exchange shell is provided above the pressure relief mechanism; and a heating chamber is provided inside the heat exchange shell and connected to the heat insulation mechanism. The pressure relief mechanism includes a pressure relief hole on the top of the furnace body, and a pressure relief valve is provided below the pressure relief hole. The pressure relief valve includes a base, which is connected to the top of the furnace body via a fixing bracket. A guide frame is also provided between the base and the heat exchange shell. A first sealing plug is installed on the guide frame. The upper part of the first sealing plug passes through the pressure relief hole, and the lower part of the carrier plate is connected to the guide frame. The lower end of the inner wall of the heat exchange shell is provided with an annular groove, the diameter of which is larger than the diameter of the first sealing plug. The bottom of the first sealing plug is provided with a countersunk air inlet, which is connected to the heating chamber through a through-hole-shaped branch hole provided on the upper outer wall; A spring is fitted on the guide frame, and the two ends of the spring are fixedly connected to the top wall of the carrier plate and the furnace body, respectively. Under normal conditions, the inner wall of the heat exchange shell blocks the branch hole; when the first sealing plug moves upward to compress the spring, the branch hole communicates with the inside of the heat exchange shell through the pressure relief hole wall.

2. The high-temperature heating furnace according to claim 1, characterized in that, The heat preservation mechanism includes a liquid storage chamber disposed on the outer wall of the furnace body. The liquid storage chamber is connected to the heating pipe in the heating chamber through an inlet pipe, and the other end of the heating pipe is connected to the liquid storage chamber through an outlet pipe.

3. A high-temperature heating furnace according to claim 2, characterized in that, The heating tube is equipped with multiple containers to expand the heating area. The containers are fixed on the support mesh plate, which is connected to the heat exchange shell.

4. A high-temperature heating furnace according to claim 2, characterized in that, A water pump is installed on the inlet pipe.

5. A high-temperature heating furnace according to claim 2, characterized in that, A liquid injection pipe is installed on the liquid storage chamber, and a liquid injection valve is installed on the liquid injection pipe; The liquid storage chamber is also equipped with a drain pipe, and the drain pipe is equipped with a drain valve.

6. A high-temperature heating furnace according to claim 1, characterized in that, A top main pipe is installed above the furnace body. The top main pipe is connected to the liquid storage chamber through multiple connecting pipes. The top main pipe is connected to the heating pipe in the heating chamber through a second pipe. The heating pipe is connected to a first pipe. The first pipe is connected to a connecting pipe. A water pump is installed on the second pipe.

7. A high-temperature heating furnace according to claim 1 or 2, characterized in that, The heat exchange shell is provided with an exhaust hole at the top.

8. A high-temperature heating furnace according to claim 7, characterized in that, The heat exchange shell has an exhaust port at the top connected to an external exhaust pipe, which is fixedly installed on the heat exchange shell. The upper end of the external exhaust pipe is open, and a second sealing plug is provided inside the upper end opening of the external exhaust pipe. A switching mechanism is also installed on the heat exchange shell, which drives the second sealing plug to open and close the upper port of the external exhaust pipe.

9. A high-temperature heating furnace according to claim 8, characterized in that, The switching mechanism includes a support arm, which is fixedly connected to the heat exchange shell. A rotating shaft is mounted on the support arm, and a sector wheel is fixedly mounted on one end of the rotating shaft. A guide rod is fixedly installed on the top of the second sealing plug, and a frame is fixedly installed on the upper end of the guide rod. The sector wheel is set inside the frame. A motor is fixedly mounted on the support arm, and the output shaft of the motor passes through the support arm and is fixedly connected to the rotating shaft.

10. A high-temperature heating furnace according to claim 9, characterized in that, The motor is equipped with a dust cover.

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