A system for decolorization, deodorization and filtration of weakly polar ester compounds

Abstract

This utility model discloses a system for decolorizing, deodorizing, and filtering weakly polar ester compounds, comprising: a reaction vessel, including a lid and a body; the lid having a steam inlet, a compressed air inlet, a feed port, a powder inlet, a vacuum extraction port, and a circulating feed port; the lid being equipped with a pressure relief valve, a pressure gauge, and a thermometer; the body containing a stirring paddle and a heating unit; a steam generator connected to the steam inlet via a pipeline; an air compressor connected to the compressed air inlet via a pipeline; a powder vacuum feeder connected to the powder inlet via a pipeline; a vacuum pump connected to the vacuum extraction port via a pipeline; a multi-stage filtration module, its inlet connected to the reaction vessel's outlet, and the multi-stage filtration module having a circulation pipeline connected to the circulating feed port; and a storage tank connected to the multi-stage filtration module's outlet. This system achieves advantages such as simplified equipment, improved filtration efficiency, optimized steam deodorization, and convenient maintenance.

Description

Technical Field

[0001] This invention belongs to the field of decolorization and deodorization technology of weakly polar ester compounds, and relates to a system for decolorizing, deodorizing and filtering weakly polar ester compounds. Background Technology

[0002] In the chemical production field, there are several technical bottlenecks in the decolorization, deodorization, and filtration processes for materials. Firstly, traditional solid-liquid separation devices lack sufficient filtration precision. Conventional plate and frame filters rely on filter cloth to trap solid particles, but under high-pressure conditions, gaps easily form between the filter cloth and the frame, causing unfiltered liquid containing adsorbents or impurities to leak from the edges. Industry practice shows that the residual impurities in the filtrate from traditional plate and frame filters are generally higher than 0.5%, seriously affecting the stability of subsequent processes.

[0003] Secondly, the deodorization process requires additional equipment, significantly increasing overall costs. Existing processes typically require adding a deodorization reaction tank after decolorization and filtration, achieving deodorization by extending the material residence time or adding activated carbon adsorption units. This design not only increases equipment investment costs by more than 30%, but also complicates pipelines and increases the required floor space due to the series connection of multiple equipment stages.

[0004] Furthermore, traditional deodorization technologies suffer from efficiency drawbacks. When using deodorizing adsorbents, the removal rate of odor-causing substances is generally low due to limitations in the specific surface area of ​​the adsorbents and the ease with which their pores become clogged. In contrast, vapor deodorization can efficiently remove odor-causing substances through gas-liquid mass transfer. Utility Model Content

[0005] This invention addresses the technical problems existing in the prior art by providing a system for decolorizing, deodorizing, and filtering weakly polar ester compounds. It achieves the advantages of process integration and equipment simplification, significantly improved filtration accuracy and efficiency, optimized steam deodorization performance, and convenient maintenance.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A system for decolorizing, deodorizing, and filtering weakly polar ester compounds, comprising:

[0008] The reactor includes a lid and a body. The lid is provided with a steam inlet, a compressed air inlet, a feed port, a powder inlet, a vacuum extraction port, a circulating feed port, a pressure relief valve, a pressure gauge, and a thermometer. The pressure relief valve, pressure gauge, and thermometer are used to regulate the pressure and temperature inside the reactor and to release pressure in time when the pressure is too high. The body includes an internal stirring paddle and an external heating unit for stirring the materials inside the reactor and heating the reactor body.

[0009] A steam generator, which is connected to the steam inlet via a pipeline, is used to generate steam to enter the reaction vessel for steam deodorization of the materials.

[0010] An air compressor, wherein the air compressor is connected to the compressed air inlet via a pipeline;

[0011] A powder vacuum feeder, wherein the powder vacuum feeder is connected to the powder inlet via a pipeline and is used to store decolorizing agent;

[0012] A vacuum pump, wherein the vacuum pump is connected to the vacuum extraction port via a pipeline;

[0013] A multi-stage filtration module, wherein the inlet of the multi-stage filtration module is connected to the outlet of the reactor, and the multi-stage filtration module is provided with a circulation pipeline and is connected to the circulation inlet;

[0014] A storage tank, which is connected to the outlet of the multi-stage filtration module, is used to store the final product.

[0015] Furthermore, the multi-stage filtration module includes: a primary three-way valve, a drain pipe, a delivery pump, a primary filter, a secondary filter, an eyepiece, and a tertiary filter;

[0016] The primary three-way valve is connected to the discharge port, drain pipe and delivery pump of the reactor, respectively;

[0017] The delivery pump is connected to the primary filter and is used to deliver materials;

[0018] The primary filter, secondary filter, tertiary filter, and storage tank are connected in series via pipelines.

[0019] The secondary three-way valve is fixed on the pipeline connecting the primary filter and the secondary filter, and is also connected to the circulation pipeline.

[0020] The eyepiece is installed on the pipeline between the primary filter and the secondary three-way valve to facilitate observation of the material's clarity.

[0021] Furthermore, the primary filter is a bag filter, including a primary filter bag, which is easy to install and remove, and the filtration accuracy is controlled at 10-30μm; the secondary filter is a cartridge filter, including a secondary filter element, which is easy to install and remove, and the filtration accuracy is controlled at 1-5μm; the tertiary filter is a cartridge filter, including a tertiary filter element, which is easy to install and remove, and the filtration accuracy is controlled at 0.1-0.22μm.

[0022] Furthermore, the delivery pump is a diaphragm pump or a centrifugal pump, preferably a diaphragm pump.

[0023] Furthermore, the inner wall and lid of the vessel are made of 316L stainless steel with Ra≤0.4μm, which can effectively reduce material adhesion to the wall.

[0024] Furthermore, the stirring paddle is made of 316L stainless steel, and its surface is coated with a polytetrafluoroethylene layer to prevent the precipitation of metal ions from the stirring paddle.

[0025] Furthermore, the steam generator is an electrically heated steam generator that provides 0.5~1.0 MPa saturated steam. A pressure regulating valve and a drain valve are provided on the pipeline between the steam generator and the steam inlet, which are used to control the steam output and prevent liquid water from overflowing, respectively.

[0026] Furthermore, after the steam generator enters the vessel through the steam inlet, its pipeline extends to the bottom of the vessel to allow the steam to fully contact the material.

[0027] Furthermore, the vacuum pump is a dry screw vacuum pump used to extract gas from the reactor and can provide a vacuum environment of 5 Pa; the air compressor is an oil-free silent screw air compressor used to provide the air source.

[0028] Furthermore, the heating unit includes a jacket layer and a circulating heat transfer oil inlet and a circulating heat transfer oil outlet disposed thereon. The jacket layer encloses the vessel body, and the circulating heat transfer oil inlet and the circulating heat transfer oil outlet are externally connected to a high-temperature circulating oil bath.

[0029] Compared with the prior art, the beneficial effects of this utility model are:

[0030] 1. Process integration and equipment simplification

[0031] By integrating decolorization reaction, steam deodorization and three-stage gradient filtration into a single closed system, the need for series connection of multiple equipment such as reaction vessel, decolorization vessel, plate and frame filter, and deodorization tank in traditional processes is reduced. The equipment footprint is reduced by 40%-60%, and losses caused by material transfer are avoided, which can meet the material loss rate of ≤0.5%.

[0032] 2. Filtration accuracy and efficiency are significantly improved.

[0033] The system employs a primary filter with a filtration precision of 10-30μm, followed by a secondary filter with a filtration precision of 1-5μm, and then a tertiary filter with a filtration precision of 1-0.22μm. These primary, secondary, and tertiary filters form a three-stage progressive filtration architecture. Combined with the polishing of the inner wall and lid of the reactor vessel, the 316L stainless steel reduces the adhesion of impurities to the inner wall of the reactor, resulting in a final filtrate solid content (i.e., residual impurities) of ≤0.05% (mass fraction). This is more than 10 times lower than the residual impurities (0.5%-1.2%) of traditional plate and frame filters, thus meeting the cleanliness requirements of high-end raw materials.

[0034] 3. Optimized steam deodorization efficiency

[0035] By using a vacuum pump (5 Pa ultimate vacuum) in conjunction with 0.5-1.0 MPa saturated vapor injection, negative pressure is formed to enhance gas-liquid mass transfer, which can effectively reduce the odor of raw materials and eliminate the need for an additional deodorization reaction tank, reducing equipment costs by 25%-30%.

[0036] Convenience of maintenance

[0037] By selecting detachable filter bags and filter cartridges, quick replacement of filter bags and cartridges is possible. Furthermore, filter bags and cartridges support offline cleaning and regeneration, greatly improving the efficiency of consumable replacement and reducing usage costs. Attached Figure Description

[0038] Figure 1 This is a front view of one embodiment of the present utility model;

[0039] In the diagram: 1. Air compressor; 2. Steam generator; 3. Steam inlet; 4. Compressed air inlet; 5. Pressure relief valve; 6. Pressure gauge; 7. Feed port; 8. Agitator; 9. Powder inlet; 10. Powder vacuum feeder; 11. Vacuum extraction port; 12. Vacuum pump; 13. Thermometer; 14. Circulating feed inlet; 15. Kettle lid; 16. Kettle body; 17. Circulating heat transfer oil inlet; 18. Circulating heat transfer oil outlet; 19. Primary three-way valve; 20. Drain pipe; 21. Conveyor pump; 22. Primary filter; 23. Primary filter bag; 24. Filter discharge valve; 25. Eyepiece; 26. Secondary three-way valve; 27. Secondary filter; 28. Secondary filter element; 29. ​​Tertiary filter; 30. Tertiary filter element; 31. Storage tank; 32. Pressure regulating valve; 33. Steam trap. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0041] Conversely, this utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model as defined in the claims. Furthermore, to provide the public with a better understanding of this utility model, certain specific details are described in detail below. However, those skilled in the art will fully understand this utility model even without these detailed descriptions.

[0042] According to a specific embodiment of this utility model, a system for decolorizing, deodorizing, and filtering weakly polar ester compounds includes:

[0043] The reactor includes a lid 15 and a body 16. The lid 15 has a steam inlet 3, a compressed air inlet 4, a feed port 7, a powder inlet 9, a vacuum extraction port 11, and a circulating feed port 14. The lid 15 is equipped with a pressure relief valve 5, a pressure gauge 6, and a thermometer 13. The body 16 includes an internal stirring paddle 8 and an external heating unit for stirring the materials inside the reactor and heating the body 16.

[0044] Steam generator 2, which is connected to steam inlet 3 via a pipeline, is used to generate steam to enter the reaction vessel for steam deodorization of materials;

[0045] Air compressor 1, wherein the air compressor 1 is connected to the compressed air inlet 4 via a pipeline;

[0046] A powder vacuum feeder 10 is connected to the powder inlet 9 via a pipeline and is used to store decolorizing agent.

[0047] Vacuum pump 12, wherein the vacuum pump 12 is connected to the vacuum extraction port 11 via a pipeline;

[0048] A multi-stage filtration module, wherein the inlet of the multi-stage filtration module is connected to the outlet of the reactor, and the multi-stage filtration module is provided with a circulation pipeline and is connected to the circulation inlet 14;

[0049] Storage tank 31 is connected to the discharge port of the multi-stage filtration module.

[0050] In the following embodiments, the delivery pump 21 is specifically a variable frequency pneumatic diaphragm pump, hereinafter referred to as a diaphragm pump. Example 1:

[0051] like Figure 1 As shown, the components include: air compressor 1, steam generator 2, steam inlet 3, compressed air inlet 4, pressure relief valve 5, pressure gauge 6, feed port 7, stirring paddle 8, powder inlet 9, powder vacuum feeder 10, vacuum extraction port 11, vacuum pump 12, thermometer 13, circulating feed port 14, kettle lid 15, kettle body 16, circulating heat transfer oil inlet 17, circulating heat transfer oil outlet 18, primary three-way valve 19, drain pipe 20, diaphragm pump, primary filter 22, primary filter bag 23, filter discharge valve 24, eyepiece 25, secondary three-way valve 26, secondary filter 27, secondary filter element 28, tertiary filter 29, tertiary filter element 30, storage tank 31, pressure regulating valve 32, and drain valve 33.

[0052] The vessel lid 15 is further equipped with a steam inlet 3, a compressed air inlet 4, a pressure relief valve 5, a pressure gauge 6, a feeding port 7, a stirring paddle 8, a powder inlet 9, a vacuum extraction port 11, a thermometer 13, and a circulating feed port 14. The inner wall of the vessel body 16 and the vessel lid 15 are made of 316L stainless steel with a mirror-polished layer (Ra≤0.4μm), and the outer wall is made of 304 stainless steel with a jacket layer. The jacket layer is provided with a circulating heat transfer oil inlet 17 and a circulating heat transfer oil outlet 18. The circulating heat transfer oil inlet 17 and the circulating heat transfer oil outlet 18 are connected to a high-temperature circulating oil bath to realize the circulation of heat transfer oil within the jacket layer.

[0053] The steam generator 2 is connected to the steam inlet 3 via a pipeline. The pipeline is equipped with a pressure regulating valve 32 and a drain valve 33 to regulate pressure and prevent liquid water overflow. The steam generator 2 can stably output saturated steam at 0.5-1.0 MPa. The vacuum pump 12 is a dry screw vacuum pump, connected to the vacuum extraction port 11 via a pipeline. The ultimate vacuum degree within the system is ≤5 Pa. The powder vacuum feeder is connected to the powder inlet 9 via a pipeline.

[0054] The bottom of the vessel body 16 is provided with a discharge port, which is connected to a drain pipe 20 and a diaphragm pump via a primary three-way valve 19. The diaphragm pump is connected to a primary filter 22 via a pipeline. The primary filter 22 is a bag filter with a shell made of 316L stainless steel and contains one set of primary filter bags 23 with a filtration accuracy of 30μm, used to intercept large particles and agglomerated impurities. The bottom of the outlet of the primary filter 22 is provided with a filter discharge valve 24, which is connected to an eyepiece 25 via a pipeline to observe the material flow rate and turbidity. The eyepiece 25 is connected to a secondary three-way valve 26, which is connected to a circulation inlet 14 via a circulation pipeline and to a secondary filter 27 via a pipeline.

[0055] The secondary filter 27 is a cartridge filter with a housing made of 316L stainless steel. It contains one set of secondary filter cartridges 28 made of polypropylene, with a filtration accuracy of 5μm, used to trap fine particles and colloidal impurities. The outlet of the secondary filter 27 is equipped with a filter discharge valve 24, which is connected to the tertiary filter 29 via a pipeline. The tertiary filter 29 has a housing made of 316L stainless steel and contains one set of tertiary filter cartridges 30 made of polypropylene, with a filtration accuracy of 0.22μm, ensuring ultra-high cleanliness of the final filtrate. The outlet of the tertiary filter 29 is equipped with a filter discharge valve 24, which is connected to the storage tank 31 via a pipeline. The filter discharge valves 24 located at the bottom of the three filters are used to control the opening and closing of the pipelines.

[0056] The working principle is as follows:

[0057] Deodorization stage

[0058] The raw materials to be processed are fed into the reactor through the feed port 7; the agitator 8 is turned on, and the heat transfer oil is introduced into the jacket layer through the circulating heat transfer oil inlet 17 and flows out into the high-temperature circulating oil bath through the circulating heat transfer oil outlet 18 to heat the heat transfer oil. Then, the heat transfer oil enters the jacket layer through the circulating heat transfer oil inlet 17 to complete the circulation; thus, the stirring and heating of the materials are achieved.

[0059] The temperature of the raw materials in the reactor is monitored by thermometer 13. When the raw material temperature reaches a certain level, steam generator 2 is turned on to introduce saturated steam into reactor 16. At the same time, vacuum pump 12 is started to maintain the vacuum level in the reactor at a certain level.

[0060] Turn off the steam generator 2 and vacuum pump 12, and let the material stand to allow it to separate into layers. First, open the pressure relief valve 5, then open the first-stage three-way valve 19 at the bottom of the vessel, connecting only the drain pipe 20 to drain the water accumulated at the bottom of the vessel.

[0061] Decolorization stage

[0062] Turn on the vacuum pump 12 and add a certain amount of decolorizing adsorbent into the reaction vessel 16 through the powder vacuum feeder 10. The decolorizing adsorbent is one or more of activated carbon, activated clay and silicate.

[0063] Start the agitator 8, maintain a constant temperature and continuously draw a vacuum to keep the vacuum level inside the vessel at 10~15 kPa, in order to remove excess moisture from the material.

[0064] Turn off vacuum pump 12 and open pressure relief valve 5 to restore the pressure inside the reactor to normal.

[0065] Filtering stage

[0066] Open the first-stage three-way valve 19, but do not connect it to the drain pipe 20; only connect it to the pipe connected to the first-stage filter 22.

[0067] Ensure all ports on the vessel lid 15 are closed except for the compressed air inlet 4. Start the air compressor 1 and diaphragm pump to deliver the material to the primary filter 22. Observe the pressure on the pressure gauge 6. If the pressure is too high, shut down the air compressor 1 immediately.

[0068] Open the secondary three-way valve 26 and turn off the air compressor 1, connecting only the circulation pipeline to allow the liquid to return to the vessel body 16 through the circulation inlet 14. Check the turbidity of the material flowing through the eyepiece 25. Once the material is clear, adjust the secondary three-way valve 26 to connect with the secondary filter 27, and then disconnect it from the circulation pipeline.

[0069] The material is gradually transferred by the pressure of the diaphragm pump to the secondary filter 27 and the tertiary filter 29, and finally enters the storage tank 31 to store the final material. Example 2:

[0070] Based on the system and working principle provided in Example 1, the deodorization, decolorization, and filtration of the crude neopentyl glycol dioleate product are carried out, specifically including the following steps:

[0071] 1. Deodorization stage

[0072] 1) 20 kg of the crude neopentyl glycol dioleate to be processed is fed into the reactor body 16 through the feed port 7. The agitator 8 is then started, and the heat transfer oil is introduced into the jacket layer through the circulating heat transfer oil inlet 17 and flows out into the high-temperature circulating oil bath through the circulating heat transfer oil outlet 18 to heat the heat transfer oil. The heat transfer oil is then introduced into the jacket layer through the circulating heat transfer oil inlet 17 to complete the circulating heating. This achieves uniform stirring and heating of the material. The rotation speed is set to 60 rpm and the circulating oil bath temperature is set to 70°C.

[0073] 2) When the thermometer 13 shows that the material temperature reaches 70°C, the steam generator 2 is turned on simultaneously to inject 0.7MPa saturated steam into the vessel, and the vacuum pump 12 is started at the same time to control the vacuum degree in the vessel at about 10kPa. This mixing process lasts for 30 minutes.

[0074] 3) After the treatment is completed, turn off the steam generator 2 and vacuum pump 12, let stand for 30 minutes to allow the material to separate into layers, then open the pressure relief valve 5 in sequence to balance the pressure inside the vessel to atmospheric pressure, operate the first-stage three-way valve 19 to switch to the drain pipe 20 position to completely drain the water deposited at the bottom of the vessel, and then close the first-stage three-way valve 19.

[0075] 2. Decolorization stage

[0076] 1) Turn on the vacuum pump 12 to feed 0.2 kg of activated clay decolorizing adsorbent into the reactor 16 through the powder vacuum feeder 10.

[0077] 2) Start the agitator 8, maintain the rotation speed at 60 rpm, keep the circulating oil bath temperature constant at 70°C, and continuously evacuate the vacuum to a vacuum level of 10 kPa. This process lasts for 45 minutes;

[0078] 3) Turn off vacuum pump 12 and open pressure relief valve 5 to equalize the pressure inside the reactor to atmospheric pressure.

[0079] 3. Filtering stage

[0080] 1) Open the first-stage three-way valve 19, do not connect the drain pipe 20, and connect the pipeline to the first-stage filter 22.

[0081] 2) Ensure that all ports on the vessel lid 15 are closed except for the compressed air inlet 4. Start the air compressor 1 and diaphragm pump to deliver the material to the primary filter 22. Observe the pressure on the pressure gauge 6. When the pressure exceeds 0.1 MPa, shut down the air compressor 1 in time.

[0082] 3) Open the secondary three-way valve 26 and turn off the air compressor 1, connecting only the circulation pipeline to the circulation inlet 14. Check the turbidity of the material flowing through the eyepiece 25. After the material appears clear, adjust the secondary three-way valve 26 to connect with the secondary filter 27, and stop connecting it to the circulation pipeline.

[0083] 4) The material is gradually transferred by the diaphragm pump to the secondary filter 27 and the tertiary filter 29, and finally enters the storage tank 31.

[0084] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A system for decolorization, deodorization and filtration of weakly polar ester compounds, characterized by, include: The reactor includes a lid (15) and a body (16). The lid (15) is provided with a steam inlet (3), a compressed air inlet (4), a feed port (7), a powder inlet (9), a vacuum extraction port (11), a circulating feed port (14), a pressure relief valve (5), a pressure gauge (6), and a thermometer (13). The body (16) includes an internal stirring paddle (8) and an external heating unit. Steam generator (2), which is connected to steam inlet (3) through a pipeline, is used to generate steam to enter the reactor for steam deodorization of materials; An air compressor (1) is connected to the compressed air inlet (4) via a pipeline; A powder vacuum feeder (10) is connected to the powder inlet (9) via a pipeline and is used to store the decolorizing adsorbent. A vacuum pump (12) is connected to the vacuum extraction port (11) via a pipeline; A multi-stage filtration module, wherein the inlet of the multi-stage filtration module is connected to the outlet of the reactor, and the multi-stage filtration module is provided with a circulation pipeline and is connected to the circulation inlet (14); Storage tank (31), which is connected to the discharge port of the multi-stage filtration module.

2. The system of claim 1, wherein, The multi-stage filtration module includes: a primary three-way valve (19), a secondary three-way valve (26), a drain pipe (20), a delivery pump (21), a primary filter (22), a secondary filter (27), an eyepiece (25), and a tertiary filter (29). The first-stage three-way valve (19) is connected to the discharge port of the reactor, the drain pipe (20) and the delivery pump, respectively; The delivery pump is connected to the primary filter (22) and is used to deliver materials; The primary filter (22), secondary filter (27), tertiary filter (29) and storage tank (31) are connected in series via pipelines; The secondary three-way valve (26) is fixed on the pipeline connecting the primary filter (22) and the secondary filter (27) and is connected to the circulation pipeline; The eyepiece (25) is installed on the pipeline between the primary filter (22) and the secondary three-way valve (26) for observing the material flow rate and turbidity.

3. The system of claim 2, wherein, The primary filter (22) is a bag filter, including a primary filter bag (23). The primary filter bag (23) is easy to install and remove, and the filtration accuracy is controlled at 10-30μm. The secondary filter (27) is a cartridge filter, including a secondary filter element (28). The secondary filter element (28) is easy to install and remove, and the filtration accuracy is controlled at 1-5μm. The tertiary filter (29) is a cartridge filter, including a tertiary filter element (30). The tertiary filter element (30) is easy to install and remove, and the filtration accuracy is controlled at 0.1-0.22μm.

4. The system of claim 2, wherein, The delivery pump (21) is a diaphragm pump or a centrifugal pump.

5. The system of claim 1, wherein, The inner wall of the vessel body (16) and the vessel lid (15) are made of 316L stainless steel with Ra≤0.4μm.

6. The system of claim 1, wherein, The stirring paddle (8) is made of 316L stainless steel and its surface is covered with a polytetrafluoroethylene layer.

7. The system of claim 1, wherein, The steam generator (2) is an electric heating steam generator (2), and a pressure regulating valve (32) and a drain valve (33) are provided on the pipeline between the steam generator (2) and the steam inlet (3).

8. The system of claim 1, wherein, After the steam generator (2) enters the vessel body (16) through the steam inlet (3), its pipeline extends to the bottom of the vessel body (16).

9. The system of claim 1, wherein, The vacuum pump (12) is a dry screw vacuum pump; the air compressor (1) is an oil-free silent screw air compressor.

10. The system of claim 1, wherein, The heating unit includes a jacket layer and a circulating heat transfer oil inlet and a circulating heat transfer oil outlet disposed thereon. The jacket layer encloses the vessel body (16), and the circulating heat transfer oil inlet and the circulating heat transfer oil outlet are connected to a high-temperature circulating oil bath.

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