Waste heat recovery device for PVC (polyvinyl chloride) film material calendering production line

Abstract

The utility model provides a PVC membrane material calendaring production line waste heat recovery device which comprises a rectangular water tank, a water inlet strip and a heat preservation inner container, the heat preservation inner container is located in the rectangular water tank, a heat preservation cotton layer is arranged between the heat preservation inner container and the rectangular water tank, and a first air inlet pipe communicated with the heat preservation inner container is installed on one side of the top end of the rectangular water tank. A second air inlet pipe communicated with the heat preservation inner container is installed on the other side of the top end of the rectangular water tank, an adjusting valve is installed at one end of the second air inlet pipe, and a calendaring bin connecting port is formed in the bottom end of the adjusting valve; according to the waste gas heat recovery device, heat of waste gas can be greatly recovered, a flowing water mode is adopted, so that the heat of the waste gas is in full contact with water, the heat of the waste gas and the water are subjected to full heat exchange operation, flowing water can absorb most of heat in hot gas, and the utilization rate of the heat is increased.

Description

Technical Field

[0001] This utility model belongs to the field of PVC film processing technology, and relates to a waste heat recovery device for PVC film calendering production line. Background Technology

[0002] In the calendering production of PVC film, a calendering machine is required. The calendering machine mainly consists of a machine body, rollers, roller bearings, roller gap adjustment device, material stop device, edge trimming device, transmission system, safety devices, and heating and cooling devices. The machine body primarily serves a supporting function, including the frame and base, and also supports the rollers, bearings, adjustment devices, and other accessories.

[0003] During the processing of PVC film, the heating system is responsible for heating the entire production line. This results in the calendering process generating a lot of high-temperature organic waste gas (mainly from the calendering chamber and rollers). Existing technologies mostly use filtration structures to filter the waste gas. However, simply treating the waste gas cannot utilize its heat, leading to energy waste. Therefore, we have designed a waste heat recovery device for PVC film calendering production lines. Summary of the Invention

[0004] The purpose of this invention is to provide a waste heat recovery device for PVC film calendering production lines to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved through the following technical solution: a waste heat recovery device for a PVC film calendering production line, comprising a rectangular water tank, a water inlet strip, and an insulated inner liner. The insulated inner liner is located inside the rectangular water tank, and an insulation cotton layer is provided between the insulated inner liner and the rectangular water tank. A first air inlet pipe is installed on one side of the top of the rectangular water tank, connecting to the insulated inner liner. One end of the first air inlet pipe is provided with a roller connecting rotary joint. A second air inlet pipe is installed on the other side of the top of the rectangular water tank, connecting to the insulated inner liner. One end of the second air inlet pipe is installed with a regulating valve, and the bottom end of the regulating valve is provided with a calendering chamber connection interface. One side of the front of the rectangular water tank is connected to the water inlet strip through a strip-shaped opening. A water inlet nozzle is provided at the top of the water inlet strip. A flow platform is installed inside the insulated inner liner. A water inlet is embedded on one side of the flow platform. The water inlet is connected to the water inlet nozzle so that the water inlet strip connects to the flow platform. Multiple slow flow channels are provided at the top of the flow platform. A water source connection pipe is installed at the water inlet of the water inlet strip.

[0006] In the aforementioned waste heat recovery device for the PVC film calendering production line, a one-way exhaust valve connected to the insulated inner tank is installed at the exhaust port on one side of the rectangular water tank. One end of the one-way exhaust valve has an exhaust channel. Heat dissipation fins that contact and connect to the side wall of the rectangular water tank are installed on the side of the exhaust channel, and the bottom of the exhaust channel is connected to an exhaust section with its opening facing downwards. This design facilitates the discharge of waste gas from the insulated inner tank after water treatment to the outside, and further allows the heat in the waste gas to adhere to the outer surface of the rectangular water tank via heat conduction, further reducing heat loss from the water inside the insulated inner tank.

[0007] In the aforementioned waste heat recovery device for the PVC film calendering production line, a drain outlet is installed at the bottom of the insulated inner tank. One end of the drain outlet extends to the outside of the rectangular water tank and is fitted with a sealing seat. This design facilitates the collection and reuse of water inside the insulated inner tank, reducing water waste and rationally utilizing the waste heat from the calender.

[0008] In the aforementioned waste heat recovery device for the PVC film calendering production line, a positioning socket is provided at the bottom of the water inlet strip, and the water inlet strip is inserted into the rectangular water tank through the positioning socket. This design ensures good stability of the water inlet strip at the opening of the rectangular water tank, preventing it from loosening or falling off.

[0009] In the aforementioned waste heat recovery device for the PVC film calendering production line, both the first and second air inlet pipes are fitted with heat-insulating sleeves. This design aims to reduce heat exchange between the waste gas and the outside environment, thus greatly ensuring the recovery and reuse of heat.

[0010] Compared with existing technologies, the advantages of this waste heat recovery device for PVC film calendering production lines are as follows: it can recover a large amount of heat from waste gas, and the use of a flowing water system allows the heat from the waste gas to fully contact the water, enabling thorough heat exchange. The flowing water can absorb most of the heat from the waste gas, improving heat utilization. Furthermore, a one-way exhaust valve connected to the insulated inner tank is installed at the exhaust port on one side of the rectangular water tank, with an exhaust channel at one end. The side of the exhaust channel is fitted with heat dissipation fins that contact the side wall of the rectangular water tank, and the bottom of the exhaust channel is connected to an exhaust section with an opening facing downwards, facilitating the discharge of the water-treated waste gas inside the insulated inner tank to the outside. It can also further transfer the heat from the waste gas to the outer surface of the rectangular water tank through heat conduction, further reducing the dissipation of heat from the water inside the insulated inner tank. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the waste heat recovery device for a PVC film calendering production line according to this utility model.

[0012] Figure 2 This is a three-dimensional structural diagram of the waste heat recovery device flow platform of the PVC film calendering production line of this utility model.

[0013] Figure 3 This is a schematic diagram of the structure of the heat-insulating inner liner of the waste heat recovery device in the PVC film calendering production line of this utility model.

[0014] Figure 4 This is a three-dimensional structural diagram of the exhaust channel of the waste heat recovery device in the PVC film calendering production line of this utility model.

[0015] In the diagram, 1. Rectangular water tank; 2. First air inlet pipe; 3. Roller connecting rotary joint; 4. Insulation sleeve; 5. Second air inlet pipe; 6. Regulating valve; 7. Calendering chamber connection interface; 8. Water inlet strip; 9. Sealing seat; 10. Exhaust channel; 11. Water source connection pipeline; 12. Water inlet nozzle; 13. Positioning socket; 14. Flow platform; 15. Water inlet socket; 16. Flow channel; 17. Heat dissipation fins; 18. One-way exhaust valve; 19. Exhaust section; 20. Insulation inner liner; 21. Drain outlet; 22. Insulation cotton layer. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model relates to a waste heat recovery device for a PVC film calendering production line.

[0018] Example 1: The waste heat recovery device includes a rectangular water tank 1, a water inlet strip 8, and an insulated inner tank 20. The insulated inner tank 20 is located inside the rectangular water tank 1, and an insulation cotton layer 22 is provided between the insulated inner tank 20 and the rectangular water tank 1. A drain outlet 21 is installed at the bottom of the insulated inner tank 20, and one end of the drain outlet 21 extends to the outside of the rectangular water tank 1 and is provided with a sealing seat 9.

[0019] The rectangular water tank 1 has a first air inlet pipe 2 connected to the heat-insulating inner liner 20 installed on one side of its top. One end of the first air inlet pipe 2 is equipped with a roller connecting rotary joint 3. The other side of the top of the rectangular water tank 1 has a second air inlet pipe 5 connected to the heat-insulating inner liner 20. One end of the second air inlet pipe 5 is equipped with a regulating valve 6. The bottom end of the regulating valve 6 is equipped with a calendering chamber connection interface 7. One side of the front of the rectangular water tank 1 is connected to the water inlet strip 8 through a strip-shaped opening. The top of the water inlet strip 8 is equipped with a water inlet nozzle 12. The heat-insulating inner liner 20 has a water flow platform 14 installed inside. One side of the water flow platform 14 is embedded with a water inlet socket 15. The water inlet socket 15 is connected to the water inlet nozzle 12 so that the water inlet strip 8 is connected to the water flow platform 14. The top of the water flow platform 14 is equipped with multiple slow flow channels 16. A water source connection pipe 11 is installed at the water inlet of the water inlet strip 8.

[0020] The above scheme is used as follows: the roller connecting rotary joint 3 is connected to the exhaust end of the roller (a rotary connection is used here so that the rotating roller is not affected during the movement), and the calendering chamber connection interface 7 of the regulating valve 6 is connected to the calendering chamber to collect the two kinds of waste gas, so that the waste gas can enter the heat-insulating inner liner 20 of the rectangular water tank 1. At this time, the water inlet bar 8 is connected to the water source through the water source connection pipe 11, and the water pump is used to transport water to the water flow platform 14. The water flow platform 14 is equipped with multiple slow flow channels 16 to slow down the water flow and fully contact the heat in the waste gas. The water that absorbs heat is stored inside the heat-insulating inner liner 20 for secondary use.

[0021] In this design, the water flow platform 14 is located inside the heat-insulating inner liner 20, and there is a gap between the water flow platform 14 and the inner wall of the heat-insulating inner liner 20 that does not exceed the width of the water flow platform 14. This gap is used for water flow, so that water is stored at the bottom of the heat-insulating inner liner 20 and can be discharged through the drain outlet 21.

[0022] Furthermore, in order to minimize the heat loss of the exhaust gas entering the heat-insulating inner liner 20, heat-insulating sleeves 4 are installed on the outer surfaces of both the first air inlet pipe 2 and the second air inlet pipe 5.

[0023] Furthermore, to ensure good stability in the connection between the water inlet strip 8 and the rectangular water tank 1, a positioning socket 13 is provided at the bottom of the water inlet strip 8, through which the water inlet strip 8 is inserted into the rectangular water tank 1.

[0024] Example 2: Based on Example 1, the waste heat recovery device includes, but is not limited to, the following structure: a rectangular water tank 1, a water inlet strip 8, and an insulated inner tank 20. The insulated inner tank 20 is located inside the rectangular water tank 1, and an insulation cotton layer 22 is provided between the insulated inner tank 20 and the rectangular water tank 1. A drain outlet 21 is installed at the bottom of the insulated inner tank 20, and one end of the drain outlet 21 extends to the outside of the rectangular water tank 1 and is provided with a sealing seat 9.

[0025] A one-way exhaust valve 18 connected to the heat-insulating inner liner 20 is installed at the exhaust port on one side of the rectangular water tank 1. An exhaust channel 10 is provided at one end of the one-way exhaust valve 18. A heat dissipation fin 17 that contacts and connects to the side wall of the rectangular water tank 1 is installed on the side of the exhaust channel 10. An exhaust part 19 with its opening facing downwards is connected to the bottom of the exhaust channel 10.

[0026] The advantages of the above solution are: it facilitates the discharge of the waste gas treated by water inside the heat-insulating inner liner 20 to the outside, and can further attach the heat in the waste gas to the outer surface of the rectangular water tank 1 by heat conduction, thereby further reducing the dissipation of heat in the water inside the heat-insulating inner liner 20.

[0027] In this application, we are simply using the regulating valve 6, the heat-insulating inner liner 20, and the heat-insulating cotton layer 22 without making any structural or functional improvements. We will not elaborate on them here.

[0028] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A waste heat recovery device for a PVC film calendering production line, comprising a rectangular water tank (1), a water inlet strip (8), and an insulated inner liner (20), wherein the insulated inner liner (20) is located inside the rectangular water tank (1), and an insulation cotton layer (22) is provided between the insulated inner liner (20) and the rectangular water tank (1), characterized in that: A first air inlet pipe (2) connecting to the heat-insulating inner liner (20) is installed on one side of the top of the rectangular water tank (1). A roller connecting rotary joint (3) is provided at one end of the first air inlet pipe (2). A second air inlet pipe (5) connecting to the heat-insulating inner liner (20) is installed on the other side of the top of the rectangular water tank (1). A regulating valve (6) is installed at one end of the second air inlet pipe (5). A calendering chamber connection interface (7) is provided at the bottom end of the regulating valve (6). One side of the front of the rectangular water tank (1) is connected to the inlet through a strip-shaped opening. Water strip (8), the top of the water strip (8) is provided with a water inlet nozzle (12), the interior of the heat-insulating inner liner (20) is equipped with a water flow platform (14), a water inlet socket (15) is embedded on one side of the water flow platform (14), the water inlet socket (15) is connected to the water inlet nozzle (12) so that the water strip (8) is connected to the water flow platform (14), the top of the water flow platform (14) is provided with multiple slow flow channels (16), and a water source connection pipe (11) is installed at the water inlet of the water strip (8).

2. The waste heat recovery device for a PVC film calendering production line according to claim 1, characterized in that, A one-way exhaust valve (18) connected to the heat-insulating inner liner (20) is installed at the exhaust port on one side of the rectangular water tank (1), and an exhaust channel (10) is provided at one end of the one-way exhaust valve (18).

3. The waste heat recovery device for a PVC film calendering production line according to claim 2, characterized in that, The side of the exhaust channel (10) is equipped with heat dissipation fins (17) that are in contact with the side wall of the rectangular water tank (1), and the bottom of the exhaust channel (10) is connected to an exhaust part (19) with its opening facing downward.

4. The waste heat recovery device for a PVC film calendering production line according to claim 1, characterized in that, The bottom of the heat-insulating inner liner (20) is equipped with a drain outlet (21), one end of which extends to the outside of the rectangular water tank (1) and is provided with a sealing seat (9).

5. The waste heat recovery device for a PVC film calendering production line according to claim 1, characterized in that, The bottom of the water inlet strip (8) is provided with a positioning socket (13), and the water inlet strip (8) is inserted into the rectangular water tank (1) through the positioning socket (13).

6. The waste heat recovery device for a PVC film calendering production line according to claim 1, characterized in that, The outer surfaces of the first air inlet pipe (2) and the second air inlet pipe (5) are both fitted with heat-insulating sleeves (4).

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