Spinning device with heat energy recycling function of heat conducting oil
By using a heat exchanger to recycle the heat from the high-temperature heat transfer oil for heating the ethylene glycol evaporator, the problem of increased melt temperature during spinning was solved. This achieved heat recovery and reduced energy consumption, improved the stability of the spinning process, and lowered production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINFENGMING GRP CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-06-16
AI Technical Summary
During the spinning process, the increase in melt temperature leads to material degradation, affecting processing stability and product quality, and existing cooling methods consume a lot of energy.
A heat exchanger is used to recover the heat of the high-temperature heat transfer oil for heating the ethylene glycol evaporator, thereby reducing the energy consumption of the ethylene glycol evaporator. The temperature of the heat transfer oil entering the melt cooler is regulated by the heat transfer oil main tank and a three-way valve, thus achieving heat recovery and energy consumption reduction.
It effectively reduced production costs and energy consumption, and improved the stability and product quality of melt spinning.
Smart Images
Figure CN224362918U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polyester spinning technology, and in particular to a spinning device with the function of heat energy recovery of heat transfer oil. Background Technology
[0002] In the spinning process, the molten material needs to be conveyed by a gear pump. Typically, as the conveying pressure increases, the melt temperature gradually rises. Excessively high melt temperatures can cause material degradation, affecting the stability of subsequent processing and product quality. Therefore, a melt cooler is installed downstream of the melt pump. This cooler uses liquid-phase heat transfer oil to cool the high-temperature melt through heat exchange, thus achieving melt cooling. To control the temperature of the liquid-phase heat transfer oil, large air coolers are often used for heat dissipation. This typically consumes a significant amount of electrical energy. Utility Model Content
[0003] To address the aforementioned technical deficiencies, this invention provides a spinning device with a heat recovery function for heat transfer oil. This device can recover the heat from the high-temperature heat transfer oil after heat exchange in the melt cooler, effectively reducing production costs and energy consumption.
[0004] This utility model discloses a spinning device with heat energy recovery function of heat transfer oil, including a final polymerization kettle, a melt cooler, and a spinning box connected in sequence, and an ethylene glycol tank. The ethylene glycol tank is connected to the tube side of an ethylene glycol evaporator through a pipe, and the tube side of the ethylene glycol evaporator is connected to an ethylene glycol flash tank through a pipe. The ethylene glycol flash tank is connected to a vacuum jetting system through a pipe, and the vacuum jetting system is connected to the final polymerization kettle. It also includes a heat transfer oil heat exchanger, and the shell side of the ethylene glycol evaporator is connected to the tube side of the heat transfer oil heat exchanger through a pipe. It also includes a heat transfer oil main tank, which is connected to the shell side of the heat transfer oil heat exchanger through a pipe. The shell side of the heat transfer oil heat exchanger is connected to the melt cooler through a three-way valve. The heat transfer oil main tank is also connected to the three-way valve through a pipe, and the melt cooler is connected to the heat transfer oil main tank through a pipe.
[0005] A pipe is connected to the heat transfer oil vent tank via a pipe connecting the tube side of the heat transfer oil heat exchanger and the shell side of the ethylene glycol evaporator. A safety valve is installed on the pipe connecting the heat transfer oil vent tank.
[0006] A flow valve is installed on the pipe connecting the shell side of the heat transfer oil heat exchanger and the main heat transfer oil tank, near the end of the heat transfer oil heat exchanger. A flow valve is also installed on the pipe connecting the three-way valve and the main heat transfer oil tank, near the end of the three-way valve.
[0007] The present invention provides a spinning device with heat energy recovery function of heat transfer oil. After the melt is cooled and heat exchanged, the high-temperature heat transfer oil is transported to the heat transfer oil heat exchanger to heat the ethylene glycol evaporator, thereby increasing the temperature of ethylene glycol, reducing the energy consumption of ethylene glycol flash evaporation, and reducing the energy consumption of cooling the high-temperature heat transfer oil, thus achieving the purpose of heat energy recovery and energy saving. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0009] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.
[0010] Example 1:
[0011] like Figure 1 As shown, this utility model discloses a spinning device with heat energy recovery function of heat transfer oil, including a final polymerization kettle 4, a melt cooler 5, and a spinning box 7 connected in sequence, and also includes an ethylene glycol tank 8. The ethylene glycol tank 8 is connected to the tube side of an ethylene glycol evaporator 9 through a pipe. The tube side of the ethylene glycol evaporator 9 is connected to an ethylene glycol flash evaporator 10 through a pipe. The ethylene glycol flash evaporator 10 is connected to a vacuum jetting system 11 through a pipe. The vacuum jetting system 11 is connected to the final polymerization kettle 4. It also includes a heat transfer oil heat exchanger 1. The shell side of the ethylene glycol evaporator 9 is connected to the tube side of the heat transfer oil heat exchanger 1 through a pipe. It also includes a heat transfer oil main tank 3. The heat transfer oil main tank 3 is connected to the shell side of the heat transfer oil heat exchanger 1 through a pipe. The shell side of the heat transfer oil heat exchanger 1 is connected to the melt cooler 5 through a three-way valve 6. The heat transfer oil main tank 3 is also connected to the three-way valve 6 through a pipe. The melt cooler 5 is connected to the heat transfer oil main tank 3 through a pipe.
[0012] The final polymerization reactor 4, melt cooler 5, and spinning box 7 are all existing known spinning equipment. The ethylene glycol tank 8, ethylene glycol evaporator 9, ethylene glycol flash evaporator 10, and vacuum jet system 11 are also existing known equipment. A centrifugal pump is installed on the pipeline between the tube side of the ethylene glycol tank 8 and the ethylene glycol evaporator 9, providing power for the transport of ethylene glycol. A gear pump is installed on the pipeline between the final polymerization reactor 4 and the melt cooler 5, transporting the melt. Therefore, as the pressure increases, the melt temperature rises. Thus, heat transfer oil is needed to cool the melt cooler 5, thereby reducing the melt temperature. However, the heat transfer oil absorbs heat and heats up during the circulation process, resulting in a high temperature that is difficult to maintain to meet the cooling requirements of the melt. Therefore, currently, an air cooler is used to cool the heat transfer oil, but this increases energy consumption. In this embodiment, the high-temperature heat transfer oil in the main heat transfer oil tank 3, after exchanging heat with the melt cooler 5, is transported to the shell side of the heat transfer oil heat exchanger 1. The heat transfer oil in the tube side of the heat transfer oil heat exchanger 1 is connected to the shell side of the ethylene glycol evaporator 9 to heat the ethylene glycol. During this process, the temperature of the heat transfer oil in the tube side of the heat transfer oil heat exchanger 1 decreases, creating a temperature difference between it and the heat transfer oil in the shell side. Therefore, heat exchange occurs between the heat transfer oil in the tube side and the shell side of the heat transfer oil heat exchanger 1, increasing the temperature of the heat transfer oil in the tube side to heat the ethylene glycol in the ethylene glycol evaporator 9. The ethylene glycol evaporator 9 can generate a sufficient amount of ethylene glycol vapor. The increased temperature of the heat transfer oil used to heat the ethylene glycol evaporator 9 effectively reduces the energy consumption required by the ethylene glycol evaporator 9, achieving energy saving. The temperature of the heat transfer oil in the shell side of the heat transfer oil heat exchanger 1 decreases and can be used to cool the melt cooler 5. The melt cooler 5 has specific temperature requirements for the incoming heat transfer oil. If the output temperature of the heat transfer oil from the heat transfer oil heat exchanger 1 cannot be lower than the required temperature for the melt cooler 5, a portion of high-temperature heat transfer oil can be supplied from the main heat transfer oil tank 3 and mixed in the three-way valve 6 to ensure the temperature of the heat transfer oil entering the melt cooler 5 meets the required standard. Of course, temperature sensors can be installed in the supply pipelines to detect the temperature of the heat transfer oil at corresponding locations. Furthermore, the circulation of the heat transfer oil within the corresponding pipelines requires the installation of a delivery pump on each pipeline to provide power for the oil's transport.
[0013] This embodiment uses a heat exchanger 1 to exchange heat between the high-temperature heat transfer oil in the heat transfer oil tank 3 and the low-temperature heat transfer oil heated by the ethylene glycol evaporator 9, thereby reducing the temperature of the heat transfer oil entering the melt cooler 5. This replaces the use of a traditional air cooler and can effectively reduce power consumption.
[0014] A pipe connects the tube side of the heat transfer oil heat exchanger 1 to the shell side of the ethylene glycol evaporator 9, and is connected to a heat transfer oil vent tank 2. A safety valve is installed on the pipe connecting to the heat transfer oil vent tank 2. Under normal operation, the safety valve is closed. The amount of heat transfer oil in the pipe connected to the shell side of the ethylene glycol evaporator 9 is stable. If the heat transfer oil heat exchanger 1 malfunctions, such as a break in the connection between the tube side and the shell side, it may cause overpressure in the tube side. In this case, the safety valve can be opened to release the heat transfer oil into the heat transfer oil vent tank 2, ensuring that the heat transfer oil is not discharged uncontrollably and thus protecting the safety of the production site and the environment.
[0015] A flow valve is installed on the pipe connecting the shell side of the heat transfer oil heat exchanger 1 and the heat transfer oil main tank 3 near the end of the heat transfer oil heat exchanger 1. A flow valve is also installed on the pipe connecting the three-way valve 6 and the heat transfer oil main tank 3 near the end of the three-way valve 6.
[0016] In actual production, the temperature of the heat transfer oil output from the main heat transfer oil tank 3 fluctuates after entering the shell side of the heat transfer oil exchanger and exchanging heat with the heat transfer oil in the tube side of the heat transfer oil exchanger 1, especially when the amount of ethylene glycol evaporated in the ethylene glycol evaporator 9 changes. This means that in order to maintain the required temperature of the heat transfer oil after passing through the three-way valve 6, if the temperature of the heat transfer oil output from the shell side of the heat transfer oil exchanger 1 decreases while the amount remains constant, and the temperature of the heat transfer oil output from the main heat transfer oil tank 3 remains constant, then the amount of heat transfer oil supplied from the main heat transfer oil tank 3 to the three-way valve 6 needs to be increased to maintain a constant temperature of the heat transfer oil entering the melt cooler 5. Therefore, the flow rate can be adjusted by the flow valve to ensure that the temperature of the heat transfer oil entering the melt cooler 5 remains constant and stable, thus improving the stability of melt spinning.
[0017] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0018] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the interaction relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0019] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0020] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simplification, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A spinning device with heat energy recovery function of heat transfer oil, comprising a final polymerization kettle, a melt cooler, and a spinning box connected in sequence, characterized in that: It also includes an ethylene glycol tank, which is connected to the tube side of an ethylene glycol evaporator via a pipeline. The tube side of the ethylene glycol evaporator is connected to an ethylene glycol flash tank via a pipeline. The ethylene glycol flash tank is connected to a vacuum injection system via a pipeline. The vacuum injection system is connected to a final polymerization reactor. It also includes a heat transfer oil heat exchanger, whose shell side is connected to the tube side via a pipeline. Furthermore, it includes a main heat transfer oil tank, which is connected to the shell side of the heat transfer oil heat exchanger via a pipeline. The shell side of the heat transfer oil heat exchanger is connected to a melt cooler via a three-way valve. The main heat transfer oil tank is also connected to the three-way valve via a pipeline, and the melt cooler is connected to the main heat transfer oil tank via a pipeline.
2. The spinning device with heat energy recovery function of heat transfer oil according to claim 1, characterized in that: A pipe is connected to the heat transfer oil vent tank via a pipe connecting the tube side of the heat transfer oil heat exchanger and the shell side of the ethylene glycol evaporator. A safety valve is installed on the pipe connecting the heat transfer oil vent tank.
3. A spinning device with heat energy recovery function of heat transfer oil according to claim 1, characterized in that: A flow valve is installed on the pipe connecting the shell side of the heat transfer oil heat exchanger and the main heat transfer oil tank, near the end of the heat transfer oil heat exchanger. A flow valve is also installed on the pipe connecting the three-way valve and the main heat transfer oil tank, near the end of the three-way valve.