Tunnel kiln with fire blocking device

Abstract

The utility model discloses a tunnel kiln with a fire blocking device, which relates to the technical field of kiln design and manufacture and comprises a kiln body, a kiln car is arranged in the kiln body, a product to be fired is arranged on the kiln car, the kiln body is provided with a preheating section, a firing section, a transition section, a quenching section and a slow cooling section which are sequentially connected, and the fire blocking device is arranged at the joint of the transition section and the quenching section. The length of the fire blocking device is not smaller than 80% of the length of the kiln car. According to the utility model, the fire blocking device with enough length is arranged, and the contact surface of cold and hot air is a gap between the highest part of a product and the lowest part of the fire blocking device in the transition section for connecting the firing section and the quenching section in the moving process of the kiln car, so that the cold and hot gas exchange between the quenching section and the firing section is reduced; and the relative stability of the airflow of the front firing section and the rear cooling section of the fire damper is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of kiln design and manufacturing, and particularly relates to a tunnel kiln with a fire baffle device. Background Art

[0002] A tunnel kiln is a modern continuous firing thermal equipment. A common tunnel kiln generally consists of a preheating section, a firing section, and a cooling section in sequence, and controls the convection of internal air through air pressure. Products to be fired are loaded on a kiln car, enter from the kiln head of the tunnel kiln with a carrier tool, after the products are fired in the kiln, are output from the other end, the kiln tail, of the tunnel kiln, and finally enter the inlet end of the tunnel kiln through a return line for cyclic operation. However, with the movement of the kiln car between the cooling section and the firing section, the internal rapid cold air will cause the flow rate of the cold air to change due to the different weights, gaps, and heights of the products, resulting in unstable airflows from the firing section in front of the fire baffle to the preheating section and from the rapid cooling section behind the fire baffle to the slow cooling section, affecting the firing quality of the products, including preheating cracking and rapid cooling cracking of the products.

[0003] To solve the above problems, in existing embodiments, some add a fire baffle with a thickness of 50 to 230 millimeters between the firing section and the cooling section to isolate the influence of the change in the rapid cold air flow rate on the hot and cold airflows in the firing and preheating sections in front of the fire baffle and the rapid cooling and slow cooling sections behind the fire baffle, thereby reducing the influence of the airflow change on the product quality. This method can partially balance the influence of the airflow change. However, when the weights, gaps, and heights of the products are different, the highest and lowest parts of the products will sequentially pass under the fire baffle according to the arrangement order of the products, and the distance between the fire baffle and the products will constantly change, greatly affecting the airflows at both ends of the fire baffle. When the pressure difference is large, the preheating cracking and rapid cooling cracking of the products will significantly increase, and the energy consumption will also increase, reducing the firing efficiency of the tunnel kiln. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a tunnel kiln with a fire baffle device to solve the problem of reduced firing efficiency of the tunnel kiln caused by large temperature fluctuations due to the influence of airflows inside the kiln in the prior art.

[0005] The purpose of the utility model can be achieved by the following technical solutions:

[0006] A tunnel kiln with a fire baffle device includes a kiln body. A kiln car is arranged inside the kiln body, and products are arranged on the kiln car. The kiln body has a preheating section, a firing section, a transition section, a rapid cooling section, and a slow cooling section connected in sequence. A fire baffle device is arranged at the connection between the transition section and the rapid cooling section, and the length of the fire baffle device is not less than 80% of the length of the kiln car.

[0007] In the technical solution introduced above, since the length of the fire baffle device provided at the connection between the transition section and the rapid cooling section is not less than 80% of the length of the kiln car, when the kiln car enters the rapid cooling section through the transition section, the highest point of the products on the kiln car is located below the fire baffle device. Thus, the heat exchange area between the hot and cold air in the transition section and the rapid cooling section is relatively small, the hot air from the firing section will not enter the rapid cooling section in large quantities, the internal air flow of the kiln furnace is stable, and the temperature fluctuation at important positions is reduced.

[0008] In a preferred embodiment of the present utility model, the fire baffle device includes a support frame, a fireproof cross beam, and a fireproof board. The support frame is provided on the upper part of the kiln body, the fireproof cross beam is installed on the support frame, the fireproof board is installed on the fireproof cross beam, and fireproof materials are filled on the fireproof board inside the support frame.

[0009] In a preferred embodiment of the present utility model, a lifting mechanism is provided on the kiln car to leave a gap with adjustable height between the highest point of the products on the kiln car and the fireproof cross beam.

[0010] In a preferred embodiment of the present utility model, the fire baffle device further includes fireproof bricks provided at both ends of the support frame.

[0011] In the technical solution introduced above, by reducing the gap between the fire baffle device and the products, it is ensured that as little air as possible circulates inside the furnace, thereby ensuring relatively stable temperature in the transition section.

[0012] In a preferred embodiment of the present utility model, the ceiling height of the firing section is greater than the ceiling height of the rapid cooling section.

[0013] In the technical solution introduced above, by setting different ceiling heights, the hot air in the firing section entering the rapid cooling section is further reduced, thereby effectively preventing the heat exchange of hot and cold gases between the rapid cooling section and the firing section.

[0014] In a preferred embodiment of the present utility model, a number of relatively arranged burners are provided in the firing section, and a number of rapid cooling air blowing pipes are provided on the top of the kiln body in the rapid cooling section.

[0015] In summary, in the present utility model, by providing a fire baffle device with a length not less than 80% of the length of the kiln car, during the movement of the kiln car, a distance of 50 - 100 mm is always maintained between the highest point of the fired products on the kiln car and the fire baffle device. Therefore, during the movement of the kiln car, the contact area between the hot and cold air remains unchanged and is relatively small, thereby reducing the heat exchange of hot and cold gases between the rapid cooling section and the firing section and keeping the temperatures of the rapid cooling section and the firing section stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further describes the present utility model with reference to the drawings.

[0017] Figure 1 Figure 1 is a schematic side view of a tunnel kiln with a fire baffle device provided by the present utility model;

[0018] Figure 2 Figure 2 is a schematic front view of a tunnel kiln with a fire baffle device provided by the present utility model;

[0019] Figure 3 Figure 3 is a schematic structural view of a fire baffle device provided by an embodiment of the present utility model. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Refer to Figures 1 to 3 , according to the above description, the present utility model provides a tunnel kiln with a fire baffle device. The kiln wall of the tunnel kiln is a double-layer structure, the inner layer is a lightweight refractory brick kiln wall, and the outer layer is a brick. The whole tunnel kiln is a flat-top structure, that is, the cross-section of the tunnel kiln is a rectangle. The tunnel kiln has a preheating section (not shown in the figure), a firing section 100, a transition section 200, a rapid cooling section 300, and a slow cooling section (not shown in the figure) connected in sequence. In this embodiment, the ceiling height of the firing section 100 is greater than the ceiling height of the rapid cooling section 300.

[0022] A plurality of burners 110 are arranged on the side walls on both sides in the firing section 100 of the tunnel kiln.

[0023] The rapid cooling section 300 of the tunnel kiln includes a plurality of rapid cooling air pipes 310 for introducing cooling gas. The rapid cooling air pipes 310 are arranged on the top of the tunnel kiln.

[0024] Specifically, a part of the heat in the firing section 100 enters the preheating section to preheat the products in the preheating section. Then the products enter the firing section 100 for firing. After firing, the temperature of the products is initially decreased through the transition section 200, and then the products are cooled through the rapid cooling section 300 and the slow cooling section.

[0025] Refer to Figure 2, a movable kiln car 400 is provided in the tunnel kiln, and the kiln car 400 is used to load the products 500 to be fired. The kiln car 400 includes a driving part 410, a support platform 420 connected to the driving part, and a load platform 430 arranged on the support platform 420. The support platform 420 divides the interior of the tunnel kiln into an upper part for firing the products on the load platform 430 and a lower part for the driving part 410 to move. Specifically, the side walls inside the kiln body respectively have limiting parts 101 protruding from the tunnel kiln wall on both sides of the support platform 420, and protruding parts 422 cooperating with the limiting parts are arranged on both sides of the support platform 420. The kiln car 400 divides the tunnel kiln into upper and lower parts through the mutually cooperating limiting parts 101 and protruding parts 422.

[0026] The driving part 410 includes a pulley trolley 411 and a track 412 arranged in the lower half of the tunnel kiln, and the pulley trolley 411 travels through the track 412.

[0027] Lifting support columns 421 are arranged on the support platform 420. The lifting support columns 421 form the lifting mechanism of the present utility model and are used to manually adjust the height of the support plate 432, thereby controlling the height of the products on the load platform 430. The lifting support columns are made of steel structural parts and include an outer steel pipe and an inner steel pipe that can slide up and down inside the outer steel pipe. Bolt holes are evenly distributed up and down on both the outer steel pipe and the inner steel pipe. The lower end of the outer steel pipe is fixed to the support platform 420, and the upper end of the inner steel pipe is connected and fixed to the support plate 432. Each time the height of the lifting support column is adjusted, first slide the inner steel pipe inside the outer steel pipe to adjust to the determined height, and then fasten the inner steel pipe and the outer steel pipe by passing bolts through the bolt holes in the outer steel pipe and the inner steel pipe.

[0028] The load platform 430 includes a support plate 431 connected to the lifting support columns 421 and sealing plates 432 arranged at the front and rear ends of the support plate. The support plate 431 is used to carry the products to be fired. The sealing plates 432 are used to block the gap between the load platform 430 and the support platform 420. Above the load platform 430 is a product loading area 433 for placing products, and the products cannot extend out of the product loading area 433, that is, all parts of the products should be within the product loading area 433 directly above the load platform 430.

[0029] See Figure 1 , Figure 2 and Figure 3 , the fire blocking device 210 is arranged on the inner ceiling of the transition section 200. Specifically, it is arranged at the connection between the rapid cooling section 300 and the transition section 200. A part of the fire blocking device 210 can extend to the inner ceiling of the rapid cooling section 300. The fire blocking device 210 includes a support frame 211, a fireproof cross beam 212, a fireproof board 213, a fireproof filler 214, and a fireproof brick 215.

[0030] Among them, the support frame 211 is arranged on both side walls of the tunnel kiln. A fireproof cross beam 212 is installed on the support frame 211. A fireproof board 213 is laid above the fireproof cross beam 212. Fireproof filler 214 is filled in the kiln body space between the internal ceiling and the fireproof board 213, and fireproof bricks 215 are used to seal the fireproof filler 214 at the front and rear ends of the fireproof board.

[0031] In the embodiment of the present utility model, the length of the fire baffle device should be set long enough, at least not less than 80% of the length of the kiln car 400, preferably 100%-120% of the length of the kiln car. The lowest point at the lower end of the above-mentioned fire baffle device 210 is the lower edge of the fireproof cross beam 212. In this way, when the kiln cars are set to be connected front and back and enter the tunnel kiln in sequence, and the products on the kiln cars are placed neatly (that is, the products on the kiln cars are arranged in the same direction front and back, or opposite front and back), since there will be a certain horizontal thickness at the highest part of the products on the kiln car (such as the thickness of the water tank of a toilet), a long enough fire baffle device is sufficient to ensure that there is always the highest part of the products on the kiln car under the fire baffle device 210 during the process of the kiln car passing through the transition section 200 and entering the rapid cooling section 300, that is, the contact surface between the hot and cold air between the transition section 200 and the rapid cooling section 300 can be maintained as the gap between the highest part of the product and the lower end of the fire baffle device, that is, there will always be a small air passage. Moreover, the highest height of the product can be adjusted by the lifting support column 421 on the kiln car 400. In the optimal case, by adjusting the height of the loading platform 430 of the kiln car, the distance between the highest part of the product on the loading platform and the lower end of the fire baffle device can be 50-100 mm, and the cross-sectional area of this gap is very small relative to the cross-sectional area of the kiln body. Therefore, the heat exchange in the transition section can only occur on a very small contact surface between the product and the fire baffle device, and it is difficult for the cold air and hot air to conduct a large amount of heat exchange in the transition section, thereby stabilizing the temperature inside the kiln body.

[0032] It should be noted that in the embodiment of the present utility model, there is a certain height difference between the lower surface of the fireproof cross beam 212 of the fire baffle device and the lower surface of the fireproof board 213, but this height difference and the gap distance between the highest height of the product and the lower surface of the fireproof cross beam 212 of the fire baffle device can be ignored.

[0033] For further reference Figure 1 , taking the product as a toilet as an example, the firing process of the present utility model will be further described.

[0034] Place two rows of toilets to be fired facing each other above the kiln car. The toilets to be fired are arranged face to face, front and back. And the highest part of the product is located at the front and rear ends of the kiln car. Considering the interval between kiln cars and the structure of the product itself, the length of the fire baffle device can be appropriately shortened. In this embodiment, considering that the highest part of the toilet itself (the water tank of the toilet) has a certain horizontal thickness, generally exceeding 0.1 meter. Therefore, specifically in this embodiment, the length of the kiln car can be set to 1.55 meters, and the length of the fire baffle device can be correspondingly set between 1.35 meters and 1.55 meters. The lower part of the toilet is the upper edge of the toilet seat ring, and the highest part of the toilet is the upper surface of the water tank. Since the toilets to be fired are arranged face to face, front and back, the highest parts of the toilets are provided at both the head and the tail of the kiln car. When the length of the fire baffle device is set to 1.35 meters, the distance between the water tanks of the two rows of toilets on the kiln car should be less than 1.35 meters. Thus, it is ensured that when a single kiln car passes through the fire baffle device, at least one water tank of the toilet is always located below the fire baffle device. After connecting multiple kiln cars end to end, according to the height of the fire baffle device and the height of the toilet water tank, adjust the height of the loading platform of each kiln car so that the distance between the fire prevention cross beam of the fire baffle device and the top surface of the toilet water tank is maintained between 50 and 100 millimeters. Then push the kiln cars into the tunnel kiln for firing in sequence. A more preferred solution is to consider the gap between kiln cars and set the length of the fire baffle device to exceed 1.55 meters. In this case, as long as it is ensured that the toilets placed on the kiln car do not exceed the loading platform of the kiln car, it can be ensured that during the process of the kiln car passing through the fire baffle device, there is always a water tank of a toilet below the fire baffle device.

[0035] After the toilet to be fired is preheated in the preheating section, it enters the firing section for firing. After firing is completed, it enters the transition section. When the kiln car 400 just starts to pass through the fire baffle device, the highest point of the toilet (i.e., the upper surface of the water tank of the front row of toilets) is located below the fire baffle device. At this time, the heat exchange surface between the hot air in the firing section and the cold air in the rapid cooling section is the gap between the upper surface of the water of the toilet and the fire baffle device. The cross-sectional area of this gap is small, so only a small part of the air can be used for heat exchange, and at this time, the temperature change in the kiln body is very small.

[0036] As the kiln car moves, when the water tank of the front row of toilets leaves the fire baffle device, the water tank of the rear row of toilets has reached below the fire baffle device. At this time, the heat exchange surface between the hot air in the firing section and the cold air in the rapid cooling section is still the gap between the upper surface of the water tank of the toilet and the fire baffle device. The cross-sectional area of this gap is small, so only a small part of the air can be used for heat exchange, and at this time, the temperature change in the kiln body is very small.

[0037] The kiln car continues to move until the toilet water tanks in the back row are about to leave the fire baffle device. At this time, the toilet water tanks on the next kiln car are already under the fire baffle device. Therefore, the heat exchange surface between the hot air in the firing section and the cold air in the rapid cooling section is still the gap between the upper surface of the toilet water tank and the fire baffle device. The cross-sectional area of this gap is small, so only a small part of the air can be used for heat exchange, and the temperature change in the kiln body is very small at this time.

[0038] It should be noted that the height difference between the fireproof cross beam and the fireproof board of the fire baffle device is very small, only 50 - 100 millimeters. Thus, it can be seen that during the movement of the kiln car in the transition section, the heat exchange in the transition section is stable, and the temperature in the transition section will not fluctuate greatly.

[0039] To sum up, in the present utility model, by setting a fire baffle device with a length exceeding that of the kiln car, when the kiln car passes through the fire baffle device, a heat exchange channel is formed between the highest point of the products on the kiln car and the fire baffle device, thereby reducing the heat exchange surface, keeping the temperatures on both sides of the fire baffle device stable, avoiding the scaling phenomenon caused by unstable temperature of the products and the cracking of the products caused by uneven temperature, so as to improve the completion quality and output of the products.

[0040] The above-described embodiments merely represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A tunnel kiln with a fire baffle device, comprising a kiln body, a kiln car is arranged in the kiln body, products to be fired are placed on the kiln car, the kiln body has a preheating section, a firing section, a transition section, a rapid cooling section and a slow cooling section which are connected in sequence, and a fire baffle device is arranged at the connection between the transition section and the rapid cooling section, and it is characterized in that, The length of the fire baffle device is not less than 80% of the length of the kiln car.

2. The tunnel kiln according to claim 1, characterized in that, The fire baffle device includes a support frame, a fireproof cross beam and a fireproof board. The support frame is arranged on the upper part of the kiln body. The fireproof cross beam is installed on the support frame. The fireproof board is erected on the fireproof cross beam. Fireproof filler is filled in the kiln body space between the ceiling of the kiln body and the fireproof board.

3. The tunnel kiln according to claim 2, wherein, A lifting mechanism is provided on the kiln car to keep a distance of 50-100 mm between the highest point of the product on the kiln car and the fireproof cross beam.

4. The tunnel kiln according to claim 3, characterized in that, The fire baffle device further includes fireproof bricks arranged at the front and rear ends of the fireproof board to seal the fireproof filler.

5. The tunnel kiln according to claim 1, wherein, The ceiling height of the firing section is greater than the ceiling height of the rapid cooling section.

6. The tunnel kiln according to claim 1, wherein, A number of relatively arranged burners are provided in the firing section, and a number of rapid cooling air pipes are provided on the top of the kiln body in the rapid cooling section.

7. The tunnel kiln according to claim 1, characterized in that The length of the fire baffle device is 100%-120% of the length of the kiln car.

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