Green body slurry heating device using kiln waste heat

Abstract

The utility model belongs to the technical field of ceramic tile production equipment, disclose a kind of green body slurry heating device using kiln waste heat, including kiln, slurry heating tank, slurry coil pipe, return pipe group, water outlet main pipe and heat exchange tube.The return pipe group is connected with the water inlet of slurry heating tank;The water outlet main pipe is connected with the water outlet of slurry heating tank;Two ends of the heat exchange tube are connected with return pipe group and water outlet main pipe respectively.The utility model directly forms heat exchange tube part by making heat exchange tube directly into kiln interior, so that the heat in the interior of kiln can be directly transferred to water by heat exchange tube part, the water in heat exchange tube can be elevated to higher temperature, so as to not only can greatly improve heat recovery efficiency, but also can shorten the heating time of green body slurry, improve the production efficiency of green powder.In addition, the utility model can build heat exchange loop by the connection of heat exchange tube, return pipe group and water outlet main pipe, avoid the internal structure of pipeline complex, thus can reduce the difficulty of pipeline layout.

Description

Technical Field

[0001] This utility model relates to the field of ceramic tile production equipment technology, and in particular to a device for heating ceramic tile slurry using waste heat from a kiln. Background Technology

[0002] The ceramic tile body is the matrix of the ceramic tile, the bottom layer of the tile structure, and is formed by pressing the body powder into shape using a press. The body powder is usually granulated by spray drying tower. Before granulation, the raw materials need to be mixed and stirred into a slurry, and the slurry is heated.

[0003] To obtain the heat required for heating the ceramic slurry, Chinese patent document CN213120142U discloses a ceramic kiln with waste heat recovery function. This method involves drawing out waste heat air from the kiln body through heat collection pipes. Multiple distribution pipes are installed within the heat collection pipes. As the hot air flows through the heat collection pipes, it contacts the pipe walls and transfers heat to the flowing water within the distribution pipes. The hot water flowing out of the distribution pipes flows to the return water pipe and then to the heat exchanger, where it transfers heat to the slurry. However, the temperature of the hot air inside the heat collection pipes is lower than the temperature inside the kiln. Therefore, using the water in the distribution pipes to exchange heat with the hot air in the heat collection pipes still results in a low heat recovery rate. Furthermore, the multiple distribution pipes within the heat collection pipes increase the difficulty of pipe layout. Utility Model Content

[0004] The purpose of this invention is to provide a heating device for billet slurry that utilizes waste heat from the kiln, aiming to solve the problems of low heat recovery rate and difficult pipeline layout in existing methods of obtaining the heat required for heating billet slurry.

[0005] To achieve the above objectives, the solution provided by this utility model is as follows: A device for heating billet slurry using waste heat from a kiln includes a kiln; and further includes: A slurry heating tank, wherein a slurry coil is provided inside the slurry heating tank; A return water pipe assembly is connected to the inlet of the slurry heating tank; A main water outlet pipe, which is connected to the outlet of the slurry heating tank; The heat exchange tube has its two ends connected to the return water pipe group and the outlet water main pipe, respectively, and the heat exchange tube has a heat exchange tube section located inside the kiln.

[0006] Optionally, the return water pipe assembly includes a first return water main pipe, a first water pump, a water storage tank, a second water pump, and a second return water main pipe; The heat exchange tube is connected to the first return water main pipe; the inlet of the first water pump is connected to the first return water main pipe, and the outlet of the first water pump is connected to the water storage tank; the inlet of the second water pump is connected to the water storage tank, and the outlet of the second water pump is connected to the second return water main pipe; the second return water main pipe is connected to the inlet of the slurry heating tank.

[0007] Optionally, there are two of each of the first and second water pumps; the first return water main is connected to two first branch pipes, and the first branch pipes are connected to the inlet end of the first water pump; the second return water main is connected to two second branch pipes, and the second branch pipes are connected to the outlet end of the second water pump; and a water control valve is provided on both the first and second branch pipes.

[0008] Optionally, the inlet of the slurry heating tank is located at the upper part of the slurry heating tank, and the outlet of the slurry heating tank is located at the lower part of the slurry heating tank; the outlet of the slurry heating tank is connected to a third water pump, and the outlet end of the third water pump is connected to the main outlet pipe.

[0009] Optionally, the green body slurry heating device utilizing kiln waste heat further includes a slurry mixing tank, a slurry pump connected to the slurry mixing tank outlet, and a slurry conveying pipe. One end of the slurry conveying pipe is connected to the slurry pump outlet, and the other end of the slurry conveying pipe is connected to the slurry inlet of a slurry coil. The slurry coil is connected to a spray granulation tower.

[0010] Optionally, the slurry coil is a spiral slurry coil.

[0011] Optionally, the outer walls of the first return water main pipe, the second return water main pipe, and the outlet water main pipe are all wrapped with a layer of thermal insulation cotton.

[0012] Optionally, the heat exchange tube further includes two U-shaped tube sections connected to both ends of the heat exchange tube section. One side of the U-shaped tube section is fixedly inserted into the bottom of the kiln, and the outer wall of the other side of the U-shaped tube section is wrapped with a heat insulation cotton layer and extends upward to connect with the return water pipe group or the outlet water main pipe.

[0013] Optionally, the transverse portion of the U-shaped tube is buried below ground level. Beneficial effects: This invention provides a heating device for billet slurry utilizing waste heat from a kiln. By directly inserting heat exchange tubes into the kiln to form a heat exchange tube section, heat from the kiln can be directly transferred to water through the heat exchange tube section. Since the temperature inside the kiln is higher than the temperature of the hot air discharged from the kiln, the water inside the heat exchange tube can reach a higher temperature. This not only significantly improves heat recovery efficiency but also shortens the heating time of the billet slurry, increasing the production efficiency of billet powder. Furthermore, this invention constructs a heat exchange loop simply by connecting the heat exchange tubes, the return water pipe assembly, and the main outlet water pipe, avoiding complex internal pipe structures and thus reducing the difficulty of pipe layout. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the green body slurry heating device utilizing waste heat from the kiln provided by this utility model. Figure 1 .

[0016] Figure 2 yes Figure 1 Enlarged view of section A.

[0017] Figure 3 This is a schematic diagram of the structure of the green body slurry heating device utilizing waste heat from the kiln provided by this utility model. Figure 2 .

[0018] Figure 4 yes Figure 3 Enlarged view of section B.

[0019] Figure 5 This is a schematic diagram showing the connection between the heat exchange tube and the first return water main and the outlet water main.

[0020] Figure 6 This is a schematic diagram of the slurry coil.

[0021] Explanation of icon numbers: 1- Kiln; 2-Slurry heating tank; 3-Slurry coil; 4-Return water pipe assembly; 401-First return water main pipe; 402-First water pump; 403-Water storage tank; 404-Second water pump; 405-Second return water main pipe; 406-First branch pipe; 407-Second branch pipe; 408-Water control valve; 5-Main water outlet pipe; 6-Heat exchange tube; 601-Heat exchange tube section; 602-U-shaped tube section; 7-Third water pump; 8-Slurry mixing tank; 9-Slurry pump; 10-Slurry conveying pipe. 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] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0025] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0026] Please see Figures 1 to 6 This utility model provides a device for heating slurry of ceramic tile using waste heat from a kiln, including a kiln 1. The kiln 1 can be a roller kiln used for firing ceramic tiles. According to the ceramic tile firing process requirements, the roller kiln can be divided into a drainage section, a preheating section, an oxidation section, a firing section, a high-insulation section, and a cooling section. Figure 1 Only a partial structural schematic diagram of the cooling section of kiln 1 is shown.

[0027] Furthermore, the billet slurry heating device utilizing waste heat from the kiln also includes a slurry heating tank 2, a slurry coil 3, a return water pipe assembly 4, a main water outlet pipe 5, and a heat exchange pipe 6. The slurry heating tank 2 is used to heat the billet slurry to be transported to the spray granulation tower. The slurry coil 3 is located inside the slurry heating tank 2. When heating the billet slurry using the slurry heating tank 2, the billet slurry is transported to the slurry coil 3 and exchanges heat with the hot water in the slurry heating tank 2 to achieve temperature increase.

[0028] The return water pipe assembly 4 is connected to the inlet of the slurry heating tank 2; the outlet water main 5 is connected to the outlet of the slurry heating tank 2; both ends of the heat exchange tube 6 are connected to the return water pipe assembly 4 and the outlet water main 5 respectively, and the heat exchange tube 6 has a heat exchange tube section 601 located inside the kiln 1. With the help of the return water pipe assembly 4, the outlet water main 5, and the heat exchange tube 6, water in the slurry heating tank 2 can circulate in and out to the heat exchange tube 6 located inside the kiln 1. Specifically, the outlet water main 5 is used to transport the water discharged from the outlet of the slurry heating tank 2 to the heat exchange tube 6, and the return water pipe assembly 4 is used to transport the high-temperature water that has undergone heat exchange and heating back into the slurry heating tank 2.

[0029] Because this invention extends the heat exchange tube 6 directly into the kiln 1 to form a heat exchange tube section 601, when water is delivered into the heat exchange tube 6, the heat inside the kiln 1 can be directly transferred to the water through the heat exchange tube section 601. Since the temperature inside the kiln 1 is higher than the temperature of the hot air discharged from the kiln 1, the water inside the heat exchange tube 6 can reach a higher temperature. This not only significantly improves heat recovery efficiency but also shortens the heating time of the billet slurry, increasing the production efficiency of the billet powder. Furthermore, this invention can construct a heat exchange circuit simply by connecting the heat exchange tube 6, the return water pipe assembly 4, and the outlet water main pipe 5, avoiding complex internal pipe structures and thus reducing the difficulty of pipe layout.

[0030] It should be noted that the cooling section of kiln 1 can include a rapid cooling section, a slow cooling section, a direct cooling section, and a tail cooling section according to the cooling process of the ceramic tiles. The temperature in the slow cooling section of kiln 1 is between 450℃ and 700℃, and the temperature in the direct cooling section is between 110℃ and 450℃. The temperature in the rapid cooling section of kiln 1 is higher than that in the slow cooling section. Therefore, to prevent the water in the heat exchange tube 6 from overheating and generating steam, the heat exchange tube section 601 of the heat exchange tube 6 can be installed in either the slow cooling section or the direct cooling section of kiln 1.

[0031] In an optional embodiment, to accelerate the heating rate of the water, multiple heat exchange tubes 6 can be provided, with both ends of each heat exchange tube 6 connected to the return water pipe group 4 and the outlet water main pipe 5, respectively. The heat exchange tube section 601 can be located below the conveying rollers inside the kiln 1, without affecting the normal conveying of ceramic tiles inside the kiln 1. To extend the service life of the heat exchange tube section 601, its surface can be coated with a high-temperature resistant alumina ceramic coating.

[0032] like Figures 1 to 5 As shown, in an optional embodiment, the return water pipe assembly 4 includes a first return water main pipe 401, a first water pump 402, a water storage tank 403, a second water pump 404, and a second return water main pipe 405; the heat exchange pipe 6 is connected to the first return water main pipe 401; the inlet of the first water pump 402 is connected to the first return water main pipe 401, and the outlet of the first water pump 402 is connected to the water storage tank 403; the inlet of the second water pump 404 is connected to the water storage tank 403, and the outlet of the second water pump 404 is connected to the second return water main pipe 405; the second return water main pipe 405 is connected to the inlet of the slurry heating tank 2. In this embodiment, the water storage tank 403 can store and buffer hot water, avoiding the impact of fluctuations in the outlet water temperature of the heat exchange pipe 6 on the subsequent heating of the slurry. At the same time, the water storage tank 403 can balance the water flow pressure and ensure the stability of the water supply.

[0033] It should be noted that, because the raw material workshop where the slurry heating tank 2 is located is far from the kiln 1, therefore... Figure 1 and Figure 3 The second return water pipe and the main outlet water pipe 5 are not fully shown.

[0034] like Figures 1 to 4 As shown, in an optional embodiment, there are two of each of the first water pump 402 and the second water pump 404. When one water pump fails, the other water pumps can still operate, thereby avoiding the problem of interruption of hot water supply due to single pump failure, and thus ensuring that the heating process of the billet slurry is not interrupted.

[0035] Furthermore, the first return main pipe 401 is connected to two first branch pipes 406, and the first branch pipes 406 are connected to the inlet end of the first water pump 402; the second return main pipe 405 is connected to two second branch pipes 407, and the second branch pipes 407 are connected to the outlet end of the second water pump 404; each of the first branch pipes 406 and the second branch pipes 407 is equipped with a water control valve 408. In this embodiment, the arrangement of the first branch pipes 406 and the second branch pipes 407 enables flexible switching between single and dual pump operation, and when the water pump corresponding to a certain branch pipe fails, the water control valve 408 on the pipeline connected to that water pump is closed, thereby facilitating water pump maintenance.

[0036] like Figure 3As shown, in an optional embodiment, the inlet of the slurry heating tank 2 is located at the upper part of the slurry heating tank 2, and the outlet of the slurry heating tank 2 is located at the lower part of the slurry heating tank 2. This allows the hot water entering the tank to naturally form a flow path from top to bottom, fully filling the space inside the tank and making full contact with the slurry coil 3 inside the tank, improving heat exchange efficiency. At the same time, it facilitates the smooth discharge of water from the bottom of the tank, ensuring smooth hot water circulation. Furthermore, the outlet of the slurry heating tank 2 is connected to a third water pump 7, and the outlet end of the third water pump 7 is connected to the main outlet pipe 5, so that the water discharged from the slurry heating tank 2 can be pumped to the heat exchange tube 6 through the main outlet pipe 5.

[0037] like Figure 1 and Figure 3 As shown, in an optional embodiment, the billet slurry heating device utilizing kiln waste heat further includes a slurry mixing tank 8, a slurry pump 9 connected to the outlet of the slurry mixing tank 8, and a slurry conveying pipe 10. One end of the slurry conveying pipe 10 is connected to the outlet of the slurry pump 9, and the other end of the slurry conveying pipe 10 is connected to the inlet of the slurry coil 3. The slurry coil 3 is connected to the spray granulation tower. A feeding device (not shown in the attached figure) is provided above the slurry mixing tank 8. After the raw materials in the billet are fed into the slurry mixing tank 8 through the feeding device, the raw materials are mixed with water to form a billet slurry, which is then pumped to the slurry heating tank 2 for heating. After the heated billet slurry is discharged from the slurry coil 3, it is pumped to the spray granulation tower for granulation through pipelines.

[0038] For example, the first water pump 402, the second water pump 404, the third water pump 7, and the slurry pump 9 can all be low-speed, high-pressure pumps provided by Huayan Pump Industry.

[0039] like Figure 6 As shown, in an optional embodiment, the slurry coil 3 is a spiral slurry coil 3. The spiral slurry coil 3 can extend the flow path of the slurry within the slurry coil 3, improve heat exchange efficiency, and raise the temperature of the green body slurry more quickly.

[0040] In an optional embodiment, the outer walls of the first return water main pipe 401, the second return water main pipe 405, and the outlet water main pipe 5 are all wrapped with a heat insulation cotton layer, which can reduce the heat loss of hot water in the pipe during the transportation process, ensure the water temperature entering the slurry heating tank 2, and at the same time ensure the heat exchange efficiency between the slurry and the water, which helps to stabilize the heating of the billet slurry.

[0041] like Figure 5As shown, in an optional embodiment, the heat exchange tube 6 further includes two U-shaped tube sections 602 connected to both ends of the heat exchange tube section 601. One side of the U-shaped tube section 602 is fixedly inserted into the bottom of the kiln 1, which can stably connect to the heat exchange tube section 601 and ensure that it absorbs heat efficiently in the kiln 1. The other side of the U-shaped tube section 602 is wrapped with a heat insulation cotton layer on its outer wall and extends upward to connect with the return water pipe group 4 or the outlet water main pipe 5, thereby ensuring that the water can be circulated back and forth.

[0042] In an optional embodiment, the transverse portion of the U-shaped pipe section 602 can be buried underground with cement, which can reduce the heat loss of hot water in the transverse pipe section, while not occupying ground space and avoiding affecting the passage of workshop personnel.

[0043] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A device for heating slurry of billet using waste heat from a kiln, comprising a kiln (1); characterized in that, Also includes: Slurry heating tank (2), the slurry heating tank (2) is equipped with slurry coil (3); return water pipe group (4), the return water pipe group (4) is connected to the water inlet of the slurry heating tank (2); water outlet main pipe (5), the water outlet main pipe (5) is connected to the water outlet of the slurry heating tank (2); heat exchange pipe (6), the two ends of the heat exchange pipe (6) are respectively connected to the return water pipe group (4) and the water outlet main pipe (5), and the heat exchange pipe (6) has a heat exchange pipe section (601) located inside the kiln (1).

2. The device for heating billet slurry using waste heat from a kiln according to claim 1, characterized in that, The return water pipe assembly (4) includes a first return water main pipe (401), a first water pump (402), a water storage tank (403), a second water pump (404), and a second return water main pipe (405); the heat exchange pipe (6) is connected to the first return water main pipe (401); the inlet end of the first water pump (402) is connected to the first return water main pipe (401), and the outlet end of the first water pump (402) is connected to the water storage tank (403); the inlet end of the second water pump (404) is connected to the water storage tank (403), and the outlet end of the second water pump (404) is connected to the second return water main pipe (405); the second return water main pipe (405) is connected to the inlet of the slurry heating tank (2).

3. The device for heating billet slurry using waste heat from the kiln according to claim 2, characterized in that, The first water pump (402) and the second water pump (404) are each provided in twos; the first return water main pipe (401) is connected to two first branch pipes (406), and the first branch pipes (406) are connected to the water inlet end of the first water pump (402); the second return water main pipe (405) is connected to two second branch pipes (407), and the second branch pipes (407) are connected to the water outlet end of the second water pump (404); the first branch pipe (406) and the second branch pipe (407) are each provided with a water control valve (408).

4. The device for heating green body slurry using waste heat from a kiln according to claim 1, characterized in that, The inlet of the slurry heating tank (2) is located at the upper part of the slurry heating tank (2), and the outlet of the slurry heating tank (2) is located at the lower part of the slurry heating tank (2); the outlet of the slurry heating tank (2) is connected to a third water pump (7), and the outlet end of the third water pump (7) is connected to the main water outlet pipe (5).

5. The device for heating green body slurry using waste heat from a kiln according to claim 1, characterized in that, It also includes a slurry mixing tank (8), a slurry pump (9) connected to the slurry outlet of the slurry mixing tank (8), and a slurry conveying pipe (10). One end of the slurry conveying pipe (10) is connected to the slurry outlet of the slurry pump (9), and the other end of the slurry conveying pipe (10) is connected to the slurry inlet of the slurry coil (3). The slurry coil (3) is connected to the spray granulation tower.

6. The device for heating green body slurry using waste heat from a kiln according to claim 5, characterized in that, The slurry coil (3) is a spiral slurry coil.

7. The device for heating billet slurry using waste heat from a kiln according to claim 2, characterized in that, The outer walls of the first return water main pipe (401), the second return water main pipe (405), and the outlet water main pipe (5) are all wrapped with a layer of heat insulation cotton.

8. The device for heating billet slurry using waste heat from a kiln according to claim 1, characterized in that, The heat exchange tube (6) also includes two U-shaped tube sections (602) connected to both ends of the heat exchange tube section (601). One side of the U-shaped tube section (602) is fixedly installed at the bottom of the kiln (1), and the other side of the U-shaped tube section (602) is wrapped with a heat insulation cotton layer and extends upward to connect with the return water pipe group (4) or the outlet water main pipe (5).

9. The device for heating billet slurry using waste heat from a kiln according to claim 8, characterized in that, The transverse portion of the U-shaped tube (602) is buried below the ground.

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