A continuous glass-sintering furnace

Abstract

The utility model relates to inorganic porous material production equipment technical field discloses a kind of glass pumice continuous firing furnace, including rack, furnace body and conveying mechanism, preheating zone, heating sintering zone, high-temperature foaming zone, transition zone and cooling zone are sequentially provided in furnace body along material transmission direction;Each heating area is equipped with electric heating device and natural gas heating device;Transition zone is connected preheating zone by waste heat recovery pipeline with fan;Rack feed end is equipped with release agent coating assembly, realizes release agent automatic uniform coating;Driving roller shaft is driven by variable frequency motor, can accurately control the speed of conveyer belt.The utility model solves the problems of high energy consumption, waste heat, low coating efficiency, poor controllability of product quality of existing firing furnace, with the advantages of low energy consumption, high efficiency, stable product quality, suitable for glass pumice large-scale production.

Description

Technical Field

[0001] This utility model relates to the technical field of inorganic porous material production equipment, specifically to a continuous calcining furnace for glass pumice. Background Technology

[0002] Glass pumice is a porous, lightweight inorganic silicate material made from waste glass through grinding, batching, high-temperature calcination, and foaming. It has excellent properties such as non-combustibility, non-deformation, non-pollution, lightweight and high strength, as well as heat preservation and water storage. It is widely used in construction, environmental protection, horticulture and planting fields.

[0003] The continuous firing furnaces currently used in the production of glass lightweight stone have the following technical defects:

[0004] 1. The energy supply is limited. Existing continuous firing furnaces generally use a single electric heating method for high-temperature firing. The firing temperature of glass pumice needs to reach 880℃. Electric heating consumes a lot of energy, resulting in high energy consumption cost per unit product, which is difficult to meet the cost control requirements of large-scale industrial production.

[0005] 2. The high-temperature foaming zone and subsequent transition zone will generate a large amount of high-temperature waste heat (temperature can reach 400-600℃). The existing equipment does not effectively recover this waste heat and directly discharges it with the flue gas, which not only causes serious energy waste, but also increases the heat dissipation load of the exhaust gas treatment.

[0006] 3. To prevent the glass calcite blank from sticking to the conveyor belt during the firing process, a release agent needs to be applied to the conveyor belt. The existing method is mostly manual application, which is not only labor-intensive and inefficient, but also has poor coating uniformity. Too much or too little coating in some areas can lead to problems such as blank sticking and surface defects, affecting the product molding quality.

[0007] 4. Existing equipment conveyor belts are mostly driven by a fixed speed, which makes it impossible to accurately adjust the transmission speed according to the characteristics of different batches of raw materials and process requirements. Consequently, it is impossible to flexibly adjust the cooling time and cooling rate, resulting in uneven development of the internal pore structure of glass pumice, poor mechanical property stability, and low product quality controllability.

[0008] Therefore, there is an urgent need to design a continuous firing furnace for glass pumice that has low energy consumption, high efficiency, and stable product quality in order to solve the problems existing in the current technology. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the above-mentioned technologies and provide a continuous firing furnace for glass lightweight stone, which realizes flexible dual-energy heating, waste heat recovery and utilization, automatic and uniform application of release agent and precise control of conveyor belt speed, thereby reducing production costs, saving energy, improving production efficiency, and ensuring the structural uniformity and stability of glass lightweight stone products.

[0010] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0011] A continuous glass pumice firing furnace includes a frame, a furnace body mounted on the frame, and a conveying mechanism disposed within the furnace body. The conveying mechanism comprises a drive roller, a driven roller, several transmission rollers, and a conveyor belt. The drive roller and driven roller are rotatably mounted on the frame at the feed and discharge ends of the furnace body, respectively. The transmission rollers are rotatably mounted on the frame below the furnace body. The conveyor belt winds between the drive roller, driven roller, and transmission rollers. The furnace body is sequentially divided along the material transport direction into a preheating zone, a heating and sintering zone, a high-temperature foaming zone, a transition zone, and a cooling zone. Electric heating devices and natural gas heating devices are installed in the preheating zone, the heating and sintering zone, and the high-temperature foaming zone. The top of the transition zone is connected to the top of the preheating zone via a waste heat recovery pipe, and an induced draft fan is connected in series on the waste heat recovery pipe. Several cooling fans are fixedly installed in the cooling zone, and the outlets of the cooling fans face the conveyor belt.

[0012] Furthermore, a number of bearing rollers are laid at intervals along the material conveying direction inside the furnace body. The two ends of the bearing rollers are rotatably installed on the two side walls of the furnace body, and the conveyor belt is laid close to the top of the bearing rollers to support the conveyor belt.

[0013] Furthermore, a mold release agent coating assembly is provided on the frame below the furnace body feed end. The mold release agent coating assembly includes a mold release agent tank, a coating roller, and an auxiliary roller shaft. The mold release agent tank is fixed on the frame. The coating roller is rotatably installed in the mold release agent tank and partially immersed in the mold release agent. The conveyor belt passes under the coating roller and is in contact with the outer peripheral surface of the coating roller. The auxiliary roller shaft is symmetrically arranged on the top of both sides of the mold release agent tank and makes rolling contact with the side of the conveyor belt.

[0014] Furthermore, a liquid level sensor is fixedly installed in the mold release agent tank. The liquid level sensor is electrically connected to an external control system to monitor the liquid level of the mold release agent in real time. When the liquid level is lower than the set value, mold release agent needs to be added.

[0015] Furthermore, the active roller is driven by a variable frequency motor, which is fixed on the frame and connected to the active roller for controlling the transmission speed of the conveyor belt.

[0016] Furthermore, the electric heating device consists of several thermocouples, which are evenly distributed on the inner walls of both sides of the furnace body in each area, with the heating ends of the thermocouples facing the conveyor belt.

[0017] Furthermore, the natural gas heating device includes a mixing nozzle and an ignition device. The inlet end of the mixing nozzle is connected to a natural gas supply pipeline and a compressed air pipeline, respectively. The ignition device is fixedly installed on one side of the outlet end of the mixing nozzle, and the ignition end of the ignition device faces the outlet of the mixing nozzle.

[0018] Furthermore, the preheating zone is equipped with one set of natural gas heating devices, and the heating sintering zone and the high-temperature foaming zone are each equipped with two sets of natural gas heating devices. The natural gas heating devices in the preheating zone are fixed to the bottom of the furnace body and located below the conveyor belt, while the natural gas heating devices in the heating sintering zone and the high-temperature foaming zone are symmetrically arranged above and below the conveyor belt, respectively.

[0019] Furthermore, the outer wall of the waste heat recovery pipe is wrapped with an insulation layer, which is made of aluminum silicate fiber material.

[0020] Furthermore, the conveyor belt is a stainless steel mesh belt.

[0021] The beneficial effects of this utility model are as follows:

[0022] 1. It adopts a dual-energy structure of electric heating and natural gas heating, which can flexibly switch between single-energy heating or combined heating mode according to production needs, adapting to different production scenarios and effectively reducing production costs.

[0023] 2. Add a waste heat recovery system to recover the waste heat from the subsequent transition zone of the high-temperature foaming zone to the preheating zone, realize energy recycling, reduce energy waste, and further reduce production energy consumption.

[0024] 3. An automatic release agent application component is installed, which realizes automatic and uniform application of release agent through the contact transmission between the application roller and the conveyor belt, replacing manual application, improving production efficiency, ensuring uniform application, and improving product molding quality.

[0025] 4. Equipped with a variable frequency motor drive, the conveyor belt speed can be precisely controlled. Combined with the airflow adjustment of the cooling fan, the cooling rate can be precisely controlled, ensuring the uniformity and stability of the internal pore structure of the glass pumice and improving the controllability of product quality. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] Figure 2 This is a schematic diagram of the structure of the release agent coating component of this utility model.

[0028] In the diagram: 1. Frame; 2. Furnace body; 3. Conveying mechanism; 4. Driven roller; 5. Driven roller; 6. Conveyor belt; 7. Preheating zone; 8. Heating and sintering zone; 9. High-temperature foaming zone; 10. Transition zone; 11. Cooling zone; 12. Electric heating device; 13. Natural gas heating device; 14. Waste heat recovery pipeline; 15. Exhaust fan; 16. Cooling fan; 17. Bearing roller; 18. Release agent coating assembly; 19. Release agent tank; 20. Coating roller; 21. Auxiliary roller; 22. Liquid level sensor; 23. Mixing nozzle; 24. Ignition device; 25. Insulation layer; 26. Detailed Implementation

[0029] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0030] like Figure 1-2 As shown, a continuous glass pumice firing furnace includes a frame 1, a furnace body 2 mounted on the frame 1, and a conveying mechanism 3 disposed within the furnace body 2. The conveying mechanism 3 includes a drive roller 4, a driven roller 5, several transmission rollers 6, and a conveyor belt 7. The drive roller 4 and the driven roller 5 are rotatably mounted on the frame 1 at the feed end and discharge end of the furnace body 2, respectively. The transmission rollers 6 are rotatably mounted on the frame 1 below the furnace body 2. The conveyor belt 7 is wound between the drive roller 4, the driven roller 5, and the transmission rollers 6. The inner section is divided into a preheating zone 8, a heating and sintering zone 9, a high-temperature foaming zone 10, a transition zone 11, and a cooling zone 12 along the material conveying direction. Electric heating devices 13 and natural gas heating devices 14 are installed in the preheating zone 8, the heating and sintering zone 9, and the high-temperature foaming zone 10. The top of the transition zone 11 is connected to the top of the preheating zone 8 through a waste heat recovery pipe 15. An induced draft fan 16 is installed in series on the waste heat recovery pipe 15. Several cooling fans 17 are fixedly installed in the cooling zone 12, and the air outlets of the cooling fans 17 are set towards the conveyor belt 7.

[0031] It should be noted that: the frame 1 is welded from I-beams to ensure the overall structural stability; the furnace body 2 is constructed of high-temperature refractory materials and wrapped with an insulation structure, which is made of a composite of high-temperature ceramic fiber board and rock wool board to reduce heat loss; the various areas inside the furnace body 2 are separated by refractory partitions, with material channels reserved at the bottom of the partitions; each group of natural gas heating devices 14 has an independent flow control valve to achieve precise temperature control of each zone; the induced draft fan 16 is a high-temperature centrifugal fan, fixed in the middle of the waste heat recovery pipe 15, used to introduce the high-temperature waste heat of the transition zone 11 into the preheating zone 8 to preheat the incoming billet, replacing part of the energy consumption of electric heating and natural gas heating; the cooling fan 17 is a variable frequency fan, which can adjust the air volume according to the cooling requirements.

[0032] In this embodiment, a number of bearing rollers 18 are laid at intervals along the material conveying direction inside the furnace body 2. The two ends of the bearing rollers 18 are rotatably installed on the two side walls of the furnace body 2, and the conveyor belt 7 is laid close to the top of the bearing rollers 18 to support the conveyor belt 7.

[0033] In this embodiment, a release agent coating assembly 19 is provided on the frame 1 below the feeding end of the furnace body 2. The release agent coating assembly 19 includes a release agent tank 20, a coating roller 21, and an auxiliary roller shaft 22. The release agent tank 20 is fixed on the frame 1. The coating roller 21 is rotatably installed in the release agent tank 20 and partially immersed in the release agent. The conveyor belt 7 passes under the coating roller 21 and is in contact with the outer peripheral surface of the coating roller 21. The auxiliary roller shaft 22 is symmetrically arranged on the top of both sides of the release agent tank 20 and rolls in contact with the side of the conveyor belt 7.

[0034] In this embodiment, a liquid level sensor 23 is fixedly installed in the mold release agent tank 20. The liquid level sensor 23 is electrically connected to an external control system and is used to monitor the liquid level of the mold release agent in real time. When the liquid level is lower than the set value, mold release agent needs to be added.

[0035] In this embodiment, the active roller 4 is driven by a variable frequency motor. The variable frequency motor is fixed on the frame 1 and is connected to the active roller 4 for transmission. It is used to control the transmission speed of the conveyor belt 7. The variable frequency motor controls the residence time of the material in each area by adjusting the transmission speed.

[0036] In this embodiment, the electric heating device 13 consists of several thermocouples, which are evenly distributed on the inner walls of both sides of the furnace body 2 in each area, and the heating ends of the thermocouples are set towards the conveyor belt 7.

[0037] In this embodiment, the natural gas heating device 14 includes a mixing nozzle 24 and an ignition device 25. The inlet end of the mixing nozzle 24 is connected to the natural gas supply pipeline and the compressed air pipeline, respectively. The ignition device 25 is fixedly installed on one side of the outlet end of the mixing nozzle 24, and the ignition end of the ignition device 25 faces the outlet of the mixing nozzle 24.

[0038] In this embodiment, a set of natural gas heating devices 14 is provided in the preheating zone 8, and two sets of natural gas heating devices 14 are provided in the heating sintering zone 9 and the high-temperature foaming zone 10 respectively. The natural gas heating devices 14 in the preheating zone 8 are fixed to the bottom of the furnace body 2 and located below the conveyor belt 7. The natural gas heating devices 14 in the heating sintering zone 9 and the high-temperature foaming zone 10 are symmetrically arranged above and below the conveyor belt 7 respectively.

[0039] In this embodiment, the outer periphery of the waste heat recovery pipe 15 is wrapped with an insulation layer 26, which is made of aluminum silicate fiber material.

[0040] In this embodiment, the conveyor belt 7 is a stainless steel mesh belt.

[0041] The workflow of this utility model is as follows:

[0042] 1. Start the equipment, set the temperature of each zone through the control system, start the variable frequency motor, and adjust the stainless steel mesh belt transmission speed to 0.3m / min;

[0043] 2. Start the natural gas heating device 14 and the electric heating device 13. After the natural gas is mixed with the compressed air through the mixing nozzle 24, it is ignited and burned by the ignition device 25. The thermocouple heats the gas simultaneously. After the temperature of each area reaches the set value and stabilizes, start the induced draft fan 16 and the cooling fan 17.

[0044] 3. The release agent coating component 19 operates automatically, and the coating roller 21 rotates with the conveyor belt 7 to evenly coat the release agent on the surface of the conveyor belt 7.

[0045] 4. The glass pumice blank is evenly laid on the feed end of the conveyor belt 7. The blank enters the preheating zone 8, heating and sintering zone 9, high-temperature foaming zone 10, transition zone 11, and cooling zone 12 in sequence with the conveyor belt 7. The cooled glass pumice is output from the discharge end, completing the continuous firing process. During the process, the remaining amount of release agent is monitored by the liquid level sensor 23 and replenished in time. The speed of the conveyor belt 7 is finely adjusted according to the product quality feedback.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A continuous firing furnace for glass pumice, comprising a frame, a furnace body mounted on the frame, and a conveying mechanism disposed within the furnace body, characterized in that, The conveying mechanism includes a drive roller, a driven roller, several transmission rollers, and a conveyor belt. The drive roller and the driven roller are rotatably mounted on the frame at the feed end and discharge end of the furnace body, respectively. The transmission rollers are rotatably mounted on the frame below the furnace body. The conveyor belt is wound between the drive roller, the driven roller, and the transmission rollers. The furnace body is divided into a preheating zone, a heating and sintering zone, a high-temperature foaming zone, a transition zone, and a cooling zone along the material conveying direction. Electric heating devices and natural gas heating devices are installed in the preheating zone, the heating and sintering zone, and the high-temperature foaming zone. The top of the transition zone is connected to the top of the preheating zone through a waste heat recovery pipe, and an induced draft fan is installed in series on the waste heat recovery pipe. Several cooling fans are fixedly installed in the cooling zone, and the air outlets of the cooling fans are oriented towards the conveyor belt.

2. The continuous glass pumice firing furnace according to claim 1, characterized in that, The furnace body is provided with several bearing rollers spaced apart along the material conveying direction. The two ends of the bearing rollers are rotatably installed on the two side walls of the furnace body, and the conveyor belt is laid close to the top of the bearing rollers.

3. The continuous firing furnace for glass pumice according to claim 1, characterized in that, A mold release agent coating assembly is provided on the frame below the furnace body feed end. The mold release agent coating assembly includes a mold release agent tank, a coating roller, and an auxiliary roller shaft. The mold release agent tank is fixed on the frame. The coating roller is rotatably installed in the mold release agent tank and partially immersed in the mold release agent. The conveyor belt passes under the coating roller and is in contact with the outer circumference of the coating roller. The auxiliary roller shaft is symmetrically arranged on the top of both sides of the mold release agent tank and makes rolling contact with the side of the conveyor belt.

4. The continuous firing furnace for glass pumice according to claim 3, characterized in that, A liquid level sensor is fixedly installed inside the mold release agent tank.

5. The continuous firing furnace for glass pumice according to claim 1, characterized in that, The active roller is driven by a variable frequency motor, which is fixed on the frame and connected to the active roller via a transmission.

6. The continuous firing furnace for glass pumice according to claim 1, characterized in that, The electric heating device consists of several thermocouples, which are evenly distributed on the inner walls of both sides of the furnace body in each area, with the heating ends of the thermocouples facing the conveyor belt.

7. The continuous firing furnace for glass pumice according to claim 1, characterized in that, The natural gas heating device includes a mixing nozzle and an ignition device. The inlet end of the mixing nozzle is connected to a natural gas supply pipeline and a compressed air pipeline, respectively. The ignition device is fixedly installed on one side of the outlet end of the mixing nozzle, and the ignition end of the ignition device faces the outlet of the mixing nozzle.

8. The continuous firing furnace for glass pumice according to claim 1, characterized in that, Two sets of natural gas heating devices are respectively provided in the heating sintering zone and the high-temperature foaming zone. The natural gas heating device in the preheating zone is fixed to the bottom of the furnace body and located below the conveyor belt. The natural gas heating devices in the heating sintering zone and the high-temperature foaming zone are respectively symmetrically arranged above and below the conveyor belt.

9. The continuous firing furnace for glass pumice according to claim 1, characterized in that, The outer wall of the waste heat recovery pipeline is wrapped with an insulation layer, which is made of aluminum silicate fiber material.

10. The continuous firing furnace for glass pumice according to claim 1, characterized in that, The conveyor belt is a stainless steel mesh belt.

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