An air preheating device for a tunnel kiln

Abstract

The utility model relates to a kind of air preheating device for tunnel kiln.The air preheating device for tunnel kiln is effectively realized by being provided with air inlet end to outside air into heat exchange tank in the process of using and can effectively realize the effect of heat exchange under the action of heat exchange unit;While preheated air can be introduced into preheating cavity by air outlet end to realize the effect of good preheating of raw material;In this process, heat exchange unit can effectively slow down the residence time of high-temperature exhaust gas in heat exchange tank, effectively increase the heat exchange effect of heat exchange unit;By being provided with first spoiler and second spoiler, it can effectively change the residence time of high-temperature air in heat exchange tank, increase the flow path of high-temperature air discharged through heat exchange tank, thereby effectively increasing the heat exchange effect between high-temperature air and heat exchange tube.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment equipment, specifically an air preheating device for tunnel kilns. Background Technology

[0002] A tunnel kiln is a continuous production thermal equipment widely used in the firing processes of industries such as ceramics, refractory materials, and bricks and tiles. Products absorb heat in the preheating section for initial drying and preheating, then enter the firing section to reach the required high temperature for firing, and finally cool down in the cooling section before exiting the kiln. The entire process is continuous and efficient, with advantages such as large production capacity and stable product quality, making it an indispensable and important kiln equipment in modern industrial production.

[0003] During the operation of a tunnel kiln, the firing section generates a large amount of high-temperature waste gas. Directly discharging this waste gas not only results in significant energy waste but also increases production costs for enterprises. Simultaneously, if the air required for combustion enters the kiln without preheating, it will absorb some of the heat emitted by the products and the kiln body, causing temperature fluctuations within the kiln, affecting the firing quality of the products, and reducing the kiln's thermal efficiency. Installing air preheating equipment is precisely to fully utilize the residual heat in the high-temperature waste gas to preheat the combustion air entering the kiln.

[0004] In the operation of existing air preheating devices, due to structural or design limitations, the high-temperature exhaust gas flows too fast and has a short residence time, resulting in insufficient heat exchange, limited preheating effect, and a large amount of heat waste. Therefore, an air preheating device for tunnel kilns is proposed to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an air preheating device for tunnel kilns. By employing a multi-channel tortuous flow path design and altering the direction of exhaust gas flow, the device effectively extends the flow path of high-temperature exhaust gas within the equipment and reduces its flow velocity, thereby increasing the heat exchange time between the exhaust gas and the air to be heated. This improvement allows for a more thorough transfer of heat from the high-temperature exhaust gas to the fresh air, significantly increasing the temperature of the preheated air and enhancing the preheating effect.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an air preheating device for a tunnel kiln, comprising a tunnel kiln, the tunnel kiln including a furnace cavity, a first sealing door provided at one end of the furnace cavity, a second sealing door provided inside the furnace cavity for separation, the second sealing door dividing the furnace cavity into a preheating cavity and a combustion cavity, a heat exchange assembly for preheating air provided on the top of the tunnel kiln, the heat exchange assembly including a heat exchange tank for passing waste gas, a waste gas inlet pipe connected to the combustion cavity for introducing waste gas at the bottom of the heat exchange tank, and a support platform installed on the top of the tunnel kiln for support, and a waste gas outlet pipe for discharging waste gas at the top of the heat exchange tank;

[0007] The heat exchange tank is equipped with a heat exchange unit for preheating air. One end of the heat exchange tank is provided with an air inlet end that is connected to the heat exchange unit to facilitate the entry of external air into the heat exchange unit. The other end is provided with an air outlet end that is connected to the heat exchange unit and is used to introduce preheated air into the preheating chamber.

[0008] Furthermore, the air inlet end includes an air inlet tank that is sealed to the heat exchange tank via a flange. An air inlet pipe is provided on the top of the air inlet tank to facilitate air inlet. A fan is provided on the air inlet pipe to draw external air into the preheating chamber.

[0009] Furthermore, the air discharge end includes an air discharge tank that is sealed to the heat exchange tank via a flange, and an air discharge pipe is provided at the bottom of the air discharge tank, with the other end of the air discharge pipe connected to the preheating chamber.

[0010] Furthermore, the heat exchange unit includes sealing plates installed at both ends of the heat exchange tank for sealing the inside of the heat exchange tank. A heat exchange tube for heat exchange is provided between the two sealing plates. The two ends of the heat exchange tube pass through the two sealing plates respectively, with one end connected to the air entering the tank and the other end connected to the air exiting the tank.

[0011] Furthermore, at least one first baffle and one second baffle for changing the exhaust gas flow rate are sealed and connected to the heat exchange tube. The first baffle and the second baffle are both in the shape of a chamfer. The first baffle and the second baffle are staggered and their gaps face opposite directions. The arc edges of the first baffle and the second baffle are sealed and connected to the inner wall of the heat exchange tank.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] I. This air preheating device for tunnel kilns, by being equipped with an air inlet, effectively draws external air into the heat exchange tank during operation, and achieves effective heat exchange under the action of the heat exchange unit; at the same time, the preheated air can be introduced into the preheating chamber through the air outlet to achieve a good preheating effect on the raw materials; during this process, the heat exchange unit can effectively reduce the residence time of high-temperature exhaust gas in the heat exchange tank, effectively increasing the heat exchange effect of the heat exchange unit.

[0014] II. The air preheating device for tunnel kilns, by setting a first baffle and a second baffle, can effectively change the residence time of high-temperature air in the heat exchange tank, increase the flow path of high-temperature air as it exits through the heat exchange tank, and thus effectively increase the heat exchange effect between high-temperature air and heat exchange tubes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the heat exchange component structure of this utility model;

[0018] Figure 4 This is an exploded view of the heat exchange component structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the heat exchange unit structure of this utility model;

[0020] Figure 6 This is a diagram showing the flow direction of the waste gas in this utility model.

[0021] In the diagram: 1. Tunnel kiln; 11. First sealing door; 12. Second sealing door; 13. Preheating chamber; 14. Combustion chamber; 2. Heat exchange assembly; 21. Heat exchange tank; 211. Exhaust gas inlet pipe; 212. Support platform; 213. Exhaust gas outlet pipe; 22. Air inlet end; 221. Air inlet tank; 222. Air inlet pipe; 223. Fan; 23. Air outlet end; 231. Air outlet tank; 232. Air outlet pipe; 3. Heat exchange unit; 31. Sealing plate; 32. Heat exchange tube; 33. First baffle; 34. Second baffle. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1:

[0024] Please see Figure 1-6 This embodiment provides an air preheating device for a tunnel kiln, comprising a tunnel kiln 1. The tunnel kiln 1 includes a furnace cavity, with a first sealing door 11 at one end of the furnace cavity and a second sealing door 12 for separation inside the furnace cavity. The second sealing door 12 divides the furnace cavity into a preheating cavity 13 and a combustion cavity 14. A heat exchange assembly 2 for preheating air is provided on the top of the tunnel kiln 1. The heat exchange assembly 2 is characterized in that: the heat exchange assembly 2 includes a heat exchange tank 21 for the passage of exhaust gas, and the bottom of the heat exchange tank 21 is provided with a connection to the combustion cavity 14 for the introduction of exhaust gas. The exhaust gas inlet pipe 211 and the support platform 212 installed on the top of the tunnel kiln 1 for support are provided. The top of the heat exchange tank 21 is provided with an exhaust gas outlet pipe 213 for discharging exhaust gas. The heat exchange tank 21 is provided with a heat exchange unit 3 for preheating air. One end of the heat exchange tank 21 is provided with an air inlet end 22 that is connected to the heat exchange unit 3 to facilitate the entry of external air into the heat exchange unit 3. The other end is provided with an air outlet end 23 that is connected to the heat exchange unit 3 and is used to introduce preheated air into the preheating chamber 13. In practical use, by connecting the exhaust gas inlet pipe 211 to the combustion chamber 14, the high-temperature exhaust gas generated inside the combustion chamber 14 can enter the interior of the heat exchange tank 21 through the exhaust gas inlet pipe 211, thereby heating the heat exchange unit 3 inside the heat exchange tank 21. Under the action of the heat exchange unit 3, the residence time of the high-temperature exhaust gas in the heat exchange tank 21 can be increased, so that the high-temperature air and the heat exchange unit 3 can achieve a good heat exchange effect. Then, it is discharged through the exhaust gas outlet pipe 213. At the same time, the operator can control the air inlet end 22 to draw external air into the heat exchange unit 3 inside the heat exchange tank 21 to achieve the air preheating effect, and then use the air outlet end 23 to introduce the preheated air into the preheating chamber 13 to achieve the effect of drying and preheating the raw materials.

[0025] The technical effects of the above embodiments are as follows: by providing an air inlet end 22, it can effectively draw external air into the heat exchange tank 21 during use, and achieve effective heat exchange under the action of the heat exchange unit 3; at the same time, the preheated air can be introduced into the preheating chamber 13 through the air outlet end 23 to achieve a good preheating effect on the raw materials; in this process, the heat exchange unit 3 can effectively reduce the residence time of high temperature exhaust gas in the heat exchange tank 21, and effectively increase the heat exchange effect of the heat exchange unit 3.

[0026] As a preferred technical solution in this embodiment: the air inlet end 22 includes an air inlet tank 221 that is sealed to the heat exchange tank 21 via a flange. An air inlet pipe 222 is provided at the top of the air inlet tank 221 to facilitate air inflow. A fan 223 is installed on the air inlet pipe 222 to draw external air into the preheating chamber 13. In actual use, the operator can start the fan 223 to draw external air from the air inlet pipe 222 into the air inlet tank 221, and then send it into the heat exchange unit 3 through the air inlet tank 221 to achieve heat exchange. After preheating, the air can be introduced into the air outlet end 23 through the heat exchange unit 3, and then into the preheating chamber 13 through the air outlet end 23.

[0027] As a preferred technical solution in this embodiment: the air discharge end 23 includes an air discharge tank 231 that is sealed to the heat exchange tank 21 via a flange. An air discharge pipe 232 is provided at the bottom of the air discharge tank 231, and the other end of the air discharge pipe 232 is connected to the preheating chamber 13. When high-temperature air is introduced into the air discharge tank 231, it is discharged into the preheating chamber 13 through the air discharge pipe 232, thereby achieving the effect of preheating the raw materials in the preheating chamber 13 and reducing the energy consumption required for preheating the raw materials.

[0028] As a preferred technical solution in this embodiment: the heat exchange unit 3 includes sealing plates 31 installed at both ends of the heat exchange tank 21 to form a seal inside the heat exchange tank 21. A heat exchange tube 32 for heat exchange is arranged between the two sealing plates 31. The two ends of the heat exchange tube 32 pass through the two sealing plates 31 respectively, with one end connected to the air inlet tank 221 and the other end connected to the air outlet tank 231. In actual use, when high-temperature exhaust gas enters the heat exchange tank 21, it will heat the heat exchange tube 32, thereby achieving a good heating effect on the air entering the heat exchange tube 32 from the air inlet end 22. The heated air will be discharged from the other end of the heat exchange tube 32, thereby achieving the preheating effect on the raw materials in the preheating chamber 13.

[0029] As a preferred technical solution in this embodiment: at least one first baffle 33 and a second baffle 34 for changing the exhaust gas flow rate are sealed and connected on the heat exchange tube 32. The first baffle 33 and the second baffle 34 are both in the shape of a chamfer. The first baffle 33 and the second baffle 34 are staggered and their notches face opposite directions. The arc edges of the first baffle 33 and the second baffle 34 are sealed and connected to the inner wall of the heat exchange tank 21. This design effectively reduces the exhaust gas discharge speed during actual use and increases the residence time of the exhaust gas in the heat exchange tank 21, thereby ensuring a longer heating time for the heat exchange tube 32. When the flue gas enters the heat exchange tank 21 through the exhaust gas inlet pipe 211, it is first blocked by the second baffle 34, which changes its flow direction and causes it to be discharged through the gap of the second baffle 34. Then, the high-temperature air encounters the first baffle 33, and the high-temperature air changes direction again and is discharged through the gap of the first baffle 33. Finally, it is discharged from the exhaust gas outlet pipe 213.

[0030] Preferably, in actual use, the staff can increase the residence time of high-temperature air in the heat exchange tank 21 by increasing the number of the first baffle 33 and the second baffle 34, thereby further increasing its heat exchange effect.

[0031] The technical effects of the above embodiments are as follows: by setting the first baffle 33 and the second baffle 34, the residence time of high temperature air in the heat exchange tank 21 can be effectively changed, and the flow path of high temperature air through the heat exchange tank 21 is increased, thereby effectively increasing the heat exchange effect between high temperature air and heat exchange tube 32.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An air preheating device for a tunnel kiln, comprising a tunnel kiln (1), the tunnel kiln (1) including a furnace cavity, a first sealing door (11) provided at one end of the furnace cavity, a second sealing door (12) for separation provided inside the furnace cavity, the second sealing door (12) dividing the furnace cavity into a preheating cavity (13) and a combustion cavity (14), and a heat exchange assembly (2) for preheating air provided on the top of the tunnel kiln (1), characterized in that: The heat exchange assembly (2) includes a heat exchange tank (21) for passing exhaust gas, an exhaust gas inlet pipe (211) for passing exhaust gas in and maintaining communication with the combustion chamber (14) at the bottom of the heat exchange tank (21), and a support platform (212) installed on the top of the tunnel kiln (1) for support. An exhaust gas outlet pipe (213) for discharging exhaust gas is provided on the top of the heat exchange tank (21). The heat exchange tank (21) is equipped with a heat exchange unit (3) for preheating air. One end of the heat exchange tank (21) is provided with an air inlet (22) that is connected to the heat exchange unit (3) to facilitate the entry of external air into the heat exchange unit (3). The other end is provided with an air outlet (23) that is connected to the heat exchange unit (3) and is used to introduce preheated air into the preheating chamber (13).

2. The air preheating device for a tunnel kiln according to claim 1, characterized in that: The air inlet end (22) includes an air inlet tank (221) that is sealed to the heat exchange tank (21) by a flange. An air inlet pipe (222) is provided on the top of the air inlet tank (221) to facilitate air inlet. A fan (223) is provided on the air inlet pipe (222) to draw external air into the preheating chamber (13).

3. An air preheating device for a tunnel kiln according to claim 2, characterized in that: The air discharge end (23) includes an air discharge tank (231) that is sealed to the heat exchange tank (21) via a flange. An air discharge pipe (232) is provided at the bottom of the air discharge tank (231), and the other end of the air discharge pipe (232) is connected to the preheating chamber (13).

4. An air preheating device for a tunnel kiln according to claim 3, characterized in that: The heat exchange unit (3) includes a sealing plate (31) installed at both ends of the heat exchange tank (21) and used to form a seal inside the heat exchange tank (21). A heat exchange tube (32) for heat exchange is provided between the two sealing plates (31). The two ends of the heat exchange tube (32) pass through the two sealing plates (31) respectively. One end of the tube is connected to the air inlet tank (221) and the other end is connected to the air outlet tank (231).

5. An air preheating device for a tunnel kiln according to claim 4, characterized in that: The heat exchange tube (32) is sealed with at least a first baffle (33) and a second baffle (34) for changing the exhaust gas flow rate. The first baffle (33) and the second baffle (34) are both in the shape of a cleft and right circle. The first baffle (33) and the second baffle (34) are staggered and their gaps face opposite directions. The arc edges of the first baffle (33) and the second baffle (34) are sealed to the inner wall of the heat exchange tank (21).

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