Sintering furnace waste heat recovery and recycling device

Abstract

The utility model discloses a kind of sintering furnace waste heat recovery and recycling device, the other side of heat exchange water cavity is provided with water outlet pipe, water outlet pipe is connected with second solenoid valve by pipeline, second solenoid valve is communicated with the top of heat preservation tank by pipeline, the bottom of heat preservation tank is connected with third water pump by pipeline, third water pump is connected with fourth solenoid valve by pipeline, fourth solenoid valve is communicated with inlet pipe by pipeline, the utility model is provided with heat preservation tank for temporary storage and heating device arranged in heat preservation tank, can provide stable heat source to drying room, recover the heat of sintering furnace, reduce the waste of heat, make heat be fully utilized, the device can also input the heat temporarily stored to sintering furnace, shorten the time of sintering furnace initial heating stage, improve the efficiency of heating, reduce the heat loss of sintering furnace electric heating, with good practicability.

Description

Technical Field

[0001] This utility model relates to the technical field of waste heat recovery devices, specifically a waste heat recovery and reuse device for sintering furnaces. Background Technology

[0002] Sintering furnaces are the most important and essential production equipment in powder metallurgy, special ceramics production (silicon carbide, silicon carbide, etc.), magnetic materials production, electronic ceramics production, and glass ceramics production. High-temperature sintering furnaces typically need to be heated to over 1000 degrees Celsius and maintained at this high temperature for tens to over a hundred hours to complete the corresponding product production. To prevent the furnace shell temperature from becoming too high and affecting equipment safety, the sintering furnace shell adopts a double-layer structure, with a heat exchange chamber in between. Cold water is circulated inside the heat exchange chamber to remove the heat absorbed by the shell, keeping the shell temperature below 100 degrees Celsius. During the entire production process of a high-temperature sintering furnace, especially during high-temperature processes, the water temperature in the heat exchange chamber can reach 80 degrees Celsius or even higher. The high-temperature furnace jacket water flows into the cooling pool for natural cooling, or even after being forcibly cooled by a cooling tower, it becomes relatively low-temperature water (usually around 30 degrees Celsius). It then re-enters the sintering furnace shell jacket for heat exchange, continuously carrying away the heat absorbed by the shell, thus continuously circulating. During the production process of a high-temperature sintering furnace, the heat exchange water has a large flow rate, high temperature, and is rich in heat. However, the heat is usually dissipated into the natural environment through natural heat dissipation or even forced heat exchange by a cooling tower, resulting in a great waste of heat.

[0003] In the production process before and after using a high-temperature sintering furnace, the raw materials usually need to be dried and heated. For example, in the production of silicon carbide ceramic reaction sintering, the blank products from the previous extrusion process need to be dried before high-temperature sintering. This process requires a large heat source and a precise drying process to dry the blanks.

[0004] In addition, sintering furnaces typically use electric heating, especially during the heating phase. The initial temperature of the furnace wall is relatively low, resulting in a slow heating process that consumes a lot of electricity and reduces heating efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a sintering furnace waste heat recovery and reuse device to address the shortcomings of the existing technology, thereby solving at least one of the above-mentioned technical problems.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A sintering furnace waste heat recovery and reuse device includes a sintering furnace, a drying room, a heat preservation tank, a cold water pool, and a controller. The furnace wall of the sintering furnace is provided with a hot water exchange chamber. A water inlet pipe is provided on one side of the hot water exchange chamber, and a water outlet pipe is provided on the other side of the hot water exchange chamber. The water outlet pipe is connected to a second solenoid valve through a pipe. The second solenoid valve is connected to the top of the heat preservation tank through a pipe. The bottom of the heat preservation tank is connected to a third water pump through a pipe. The third water pump is connected to a fourth solenoid valve through a pipe. The fourth solenoid valve is connected to the water inlet pipe through a pipe. The cold water pool is connected to a first water pump through a pipe. The first water pump is connected to a first solenoid valve through a pipe. The first solenoid valve is connected to the water inlet pipe through a pipe. The water outlet pipe is connected to a fifth solenoid valve through a pipe. The fifth solenoid valve is connected to the upper part of the cold water pool through a pipe.

[0007] The drying room is equipped with heat exchange plates. The heat preservation tank is connected to a third solenoid valve through a pipe. The third solenoid valve is connected to a second water pump through a pipe. The second water pump is connected to the heat exchange plates through a pipe. The heat exchange plates are connected to a cold water tank through a pipe.

[0008] The controllers are all electrically connected to the first water pump, the second water pump, the third water pump, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve.

[0009] Specifically, the inlet pipe is equipped with a first temperature sensor, and the outlet pipe is equipped with a second temperature sensor. Both the first and second temperature sensors are electrically connected to the controller.

[0010] Specifically, the insulation tank is equipped with a third temperature sensor and a heating device, and the third temperature sensor, the heating device and the controller are electrically connected.

[0011] Specifically, a first water level sensor is installed in the upper part of the interior of the heat preservation tank, a second water level sensor is installed in the bottom of the interior of the heat preservation tank, and a sixth solenoid valve is connected to the heat preservation tank through a pipe. The sixth solenoid valve is connected to the cold water pool, and the first water level sensor, the second water level sensor, and the sixth solenoid valve are all connected to the control circuit.

[0012] Specifically, the controller is a computer.

[0013] The beneficial effects of this utility model are:

[0014] This invention, by providing a heat storage tank and a heating device within the tank, can provide a stable heat source to the drying chamber, recover heat from the sintering furnace, reduce heat waste, and ensure full utilization of heat. Furthermore, the device can re-input the temporarily stored heat into the sintering furnace, shortening the initial heating phase of the furnace, improving heating efficiency, and reducing heat loss from the electric heating system. It has good practicality. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] The attached diagram lists the components represented by each number as follows:

[0018] 1. Sintering furnace; 2. Hot water chamber; 3. Inlet pipe; 31. First temperature sensor; 4. Outlet pipe; 41. Second temperature sensor; 5. Cold water tank; 6. First water pump; 7. First solenoid valve; 8. Second solenoid valve; 9. Insulation tank; 91. Heating device; 92. Third temperature sensor; 93. First water level sensor; 94. Second water level sensor; 10. Third solenoid valve; 11. Second water pump; 12. Drying chamber; 13. Heat exchange plate; 14. Third water pump; 15. Fourth solenoid valve; 16. Fifth solenoid valve; 17. Sixth solenoid valve; 18. Controller. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example 1: See Figure 1This is a schematic diagram of the various structures of this utility model, including a sintering furnace 1, a drying chamber 12, a heat exchange tank 9, a cold water pool 5, and a controller 18. The furnace wall of the sintering furnace 1 is provided with a hot water exchange chamber 2. An inlet pipe 3 is provided on one side of the hot water exchange chamber 2, and an outlet pipe 4 is provided on the other side. Hot water enters through the inlet pipe 3 and flows out through the outlet pipe 4, exchanging heat with the furnace wall. The outlet pipe 4 is connected to a second solenoid valve 8 via a pipe, allowing the high-temperature water after heat exchange to flow out. The second solenoid valve 8 is connected to the top of the heat exchange tank 9 via a pipe, controlling the connection and disconnection of the pipe between the outlet pipe 4 and the heat exchange tank 9. The bottom of the heat exchange tank 9 is connected to a third water pump 1 via a pipe. 4. The third water pump 14 is connected to the fourth solenoid valve 15 through a pipe. The fourth solenoid valve 15 is connected to the inlet pipe 3 through a pipe. The hot water in the heat preservation tank 9 can re-enter the heat exchange chamber 2 through the inlet pipe 3 to heat the furnace wall. The cold water tank 5 is connected to the first water pump 6 through a pipe. The first water pump 6 is connected to the first solenoid valve 7 through a pipe. The first solenoid valve 7 is connected to the inlet pipe 3 through a pipe. The cold water in the cold water tank 5 is pumped into the heat exchange chamber 2 through the first water pump 6. The outlet pipe 4 is connected to the fifth solenoid valve 16 through a pipe. The fifth solenoid valve 16 is connected to the upper part of the cold water tank 5 through a pipe, which can directly introduce the heat-exchanged cold water into the cold water tank 5.

[0026] The drying chamber 12 is equipped with heat exchange plates 13. The heat exchange tank 9 is connected to a third solenoid valve 10 through a pipe. The third solenoid valve 10 is connected to a second water pump 11 through a pipe. The second water pump 11 is connected to the heat exchange plates 13 through a pipe. The heat exchange plates 13 are connected to the cold water tank 5 through a pipe. The hot water in the heat exchange tank 9 enters the heat exchange plates to heat the drying chamber 12. The cold water after heat exchange enters the cold water tank 5.

[0027] The controller 18 is electrically connected to the first water pump 6, the second water pump 11, the third water pump 14, the first solenoid valve 7, the second solenoid valve 8, the third solenoid valve 10, the fourth solenoid valve 15, and the fifth solenoid valve 16, and controls the switching of each electrical component through the controller 18.

[0028] Furthermore, the inlet pipe 3 is equipped with a first temperature sensor 31, and the outlet pipe 4 is equipped with a second temperature sensor 41. Both the first temperature sensor 31 and the second temperature sensor 41 are electrically connected to the controller 18. The flow rate of the water pump or the opening of the solenoid valve is adjusted according to the temperature of the inlet and outlet. The first solenoid valve 7, the second solenoid valve 8, and the third solenoid valve 10 are proportional solenoid valves.

[0029] Furthermore, a third temperature sensor 92 is installed inside the heat preservation tank 9, and a heating device 91 is installed in the heat preservation tank 9. The third temperature sensor 92 and the heating device 91 are electrically connected to the controller 18 to detect the temperature inside the heat preservation tank 9. When the temperature of the water inside the heat preservation tank 9 is less than 70 degrees, heating is started, and heating is stopped when it is greater than 80 degrees, so that the water inside the heat preservation tank 9 is moved within a small range to meet the heat demand of the drying room 12.

[0030] Furthermore, a first water level sensor 93 is installed at the upper part of the interior of the heat preservation tank 9, and a second water level sensor 94 is installed at the bottom of the interior of the heat preservation tank 9. The heat preservation tank 9 is connected to a sixth solenoid valve 17 through a pipe. The sixth solenoid valve 17 is connected to the cold water pool 5. The first water level sensor 93, the second water level sensor 94, and the sixth solenoid valve 17 are all connected to the control circuit. When the water level in the heat preservation tank 9 is higher than the position of the first water level sensor 93, the sixth solenoid valve 17 opens, and water flows into the cold water pool 5. When the water level is lower than the second water level sensor 94, the controller 18 controls the second water pump 11 or the third water pump 14 to shut down. Other auxiliary heating devices 91 in the drying room 12 heat the drying room 12, such as electric heating.

[0031] Furthermore, the controller 18 is a control computer that controls various electrical components.

[0032] The working principle of this utility model:

[0033] When a stable heat source is provided to the drying chamber 12, the control center controls the flow rate of the first water pump 6, the opening of the first solenoid valve 7 and the second solenoid valve 8, and closes the third water pump 14, the fourth solenoid valve 15, the fifth solenoid valve 16 and the sixth solenoid valve 17, so that the hot water at the outlet pipe 4 is kept at 80 degrees. The water after heat exchange enters the insulation tank 9. When the temperature of the water in the insulation tank 9 is less than 70 degrees, heating is carried out, and when it is greater than 80 degrees, heating is stopped. The water in the insulation tank 9 is moved within a small range to meet the heat demand of the drying chamber 12. The hot water enters the drying chamber 12 to heat the drying chamber 12, and the water after heat exchange enters the cold water pool 5.

[0034] During the initial heating stage of sintering furnace 1, the first water pump 6, the first solenoid valve 7, and the second solenoid valve 8 are closed, while the third water pump 14, the fourth solenoid valve 15, and the fifth solenoid valve 16 are opened. Hot water from the insulation tank 9 enters the heat exchange chamber 2 to exchange heat with the furnace wall. When the hot water outlet temperature at the water pipe reaches 80 degrees Celsius, the fifth solenoid valve 16 closes, and the first water pump 6, the first solenoid valve 7, and the second solenoid valve 8 open. The controller 18 controls the first water pump based on the temperatures of the inlet pipe 3 and the outlet pipe 4. 6. The flow rate of the third water pump 14 and the opening degree of the first solenoid valve 7, the second solenoid valve 8, and the fourth solenoid valve 15 keep the temperature of the outlet pipe 4 at 80 degrees Celsius and linearly reduce the temperature of the inlet pipe 3 to avoid rapid cooling. When the temperature of the inlet pipe 3 is less than 40 degrees Celsius, the third water pump 14 and the fourth solenoid valve 15 are closed. After that, the control center controls the flow rate of the first water pump 6 and the opening degree of the first solenoid valve 7 and the second solenoid valve 8 to keep the hot water at the outlet pipe 4 at 80 degrees Celsius.

[0035] This utility model, by providing a heat storage tank 9 and a heating device 91 installed in the heat storage tank 9, can provide a stable heat source to the drying chamber 12, recover the heat from the sintering furnace 1, reduce heat waste, and make full use of the heat. This device can also re-input the temporarily stored heat into the sintering furnace 1, shorten the initial heating stage of the sintering furnace 1, improve the heating efficiency, and reduce the heat loss of the electric heating of the sintering furnace 1, thus having good practicality.

[0036] The above are merely optional embodiments of this utility model and are not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0037] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

Claims

1. A device for recovering and reusing waste heat from a sintering furnace, characterized in that: The system includes a sintering furnace (1), a drying room (12), a heat exchange tank (9), a cold water pool (5), and a controller (18). The furnace wall of the sintering furnace (1) is equipped with a hot water exchange chamber (2). One side of the hot water exchange chamber (2) is equipped with an inlet pipe (3), and the other side is equipped with an outlet pipe (4). The outlet pipe (4) is connected to a second solenoid valve (8) via a pipe. The second solenoid valve (8) is connected to the top of the heat exchange tank (9) via a pipe. The bottom of the heat exchange tank (9) is connected to a third water pump via a pipe. 14), the third water pump (14) is connected to the fourth solenoid valve (15) through a pipe, the fourth solenoid valve (15) is connected to the inlet pipe (3) through a pipe, the cold water tank (5) is connected to the first water pump (6) through a pipe, the first water pump (6) is connected to the first solenoid valve (7) through a pipe, the first solenoid valve (7) is connected to the inlet pipe (3) through a pipe, the outlet pipe (4) is connected to the fifth solenoid valve (16) through a pipe, the fifth solenoid valve (16) is connected to the upper part of the cold water tank (5) through a pipe; The drying room (12) is equipped with heat exchange plates (13), the heat preservation tank (9) is connected to a third solenoid valve (10) through a pipe, the third solenoid valve (10) is connected to a second water pump (11) through a pipe, the second water pump (11) is connected to the heat exchange plates (13) through a pipe, and the heat exchange plates (13) are connected to the cold water pool (5) through a pipe. The controller (18) is electrically connected to the first water pump (6), the second water pump (11), the third water pump (14), the first solenoid valve (7), the second solenoid valve (8), the third solenoid valve (10), the fourth solenoid valve (15), and the fifth solenoid valve (16).

2. The sintering furnace waste heat recovery and reuse device according to claim 1, characterized in that: The inlet pipe (3) is equipped with a first temperature sensor (31), and the outlet pipe (4) is equipped with a second temperature sensor (41). Both the first temperature sensor (31) and the second temperature sensor (41) are electrically connected to the controller (18).

3. The sintering furnace waste heat recovery and reuse device according to claim 1, characterized in that: The heat preservation tank (9) is equipped with a third temperature sensor (92) and a heating device (91). The third temperature sensor (92), the heating device (91) and the controller (18) are electrically connected.

4. The sintering furnace waste heat recovery and reuse device according to claim 1, characterized in that: The upper part of the interior of the heat preservation tank (9) is provided with a first water level sensor (93), and the bottom of the interior of the heat preservation tank (9) is provided with a second water level sensor (94). The heat preservation tank (9) is connected to a sixth solenoid valve (17) through a pipe. The sixth solenoid valve (17) is connected to the cold water pool (5). The first water level sensor (93), the second water level sensor (94), and the sixth solenoid valve (17) are all connected to the control power supply.

5. The sintering furnace waste heat recovery and reuse device according to claim 1, characterized in that: The controller (18) is a control computer.

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