Heat conduction oil regeneration filter pressing system
By using a heat transfer oil regeneration and pressure filtration system to circulate cooling, pressure filtration, and purge to remove crystals, the problem of pipeline blockage caused by crystallization and precipitation in hydrogenated terphenyl heat transfer oil was solved, achieving efficient system operation and reduced energy consumption.
Patent Information
- Application Number
- CN202423155535.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-19
AI Technical Summary
In existing technologies, hydrogenated terphenyl heat transfer oil causes pipe blockage due to crystallization and precipitation during use. Existing insulation measures are energy-intensive and cannot completely solve the problem.
Design a heat transfer oil regeneration pressure filtration system, including an oil storage tank, a pressure filtration device, a crystallization purging device, and a finished product conveying device. The system removes crystals from the heat transfer oil through circulating cooling, pressure filtration, and purging, ensuring safe operation of the system.
It effectively filters out crystals in the heat transfer oil, improves the performance of the heat transfer oil, reduces energy consumption, and ensures the safe and stable operation of the system.
Smart Images
Figure CN223542516U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat transfer oil regeneration technology, and in particular to a heat transfer oil regeneration pressure filter system. Background Technology
[0002] Hydrogenated terphenyl heat transfer oil plays a crucial role in industrial production as a high-performance heat transfer medium. Its excellent thermal stability and chemical inertness enable it to operate stably under harsh conditions such as high temperature and high pressure, ensuring the continuous and efficient operation of the entire heat transfer oil system. However, with the passage of time, hydrogenated terphenyl heat transfer oil gradually approaches the end of its service life. At this point, complex chemical reactions occur in the oil, producing cracking products, including light components, heavy components, and the phenomenon of some hydrogenated terphenyl being reduced back to terphenyl after dehydrogenation. Terphenyl, as a high-melting-point compound (melting range 70-80℃), is prone to crystallization due to decreased solubility during the shutdown and cooling process of the heat transfer oil system. These crystals deposit on the inner walls of the pipes, gradually accumulating and causing blockages, thus posing a serious threat to the normal start-up and operation of the system.
[0003] Despite the significant advantages of hydrogenated terphenyl heat transfer oil in heat transfer applications, the aforementioned crystallization and precipitation problem has remained a major technical challenge for heat transfer oil users. This limits the efficiency and flexibility of heat transfer oil system maintenance. To address this issue, users commonly employ insulation measures, such as starting the boiler or using steam tracing during shutdowns for maintenance to maintain system temperature and prevent the crystallization and precipitation of substances like terphenyl. However, these methods are not only energy-intensive, increasing operating costs, but also, relying on insulation measures in the long term is not a fundamental solution and cannot completely resolve the crystallization and blockage problem in heat transfer oil systems. Utility Model Content
[0004] To address the problems existing in the prior art, this utility model provides a heat transfer oil regeneration pressure filtration system, comprising:
[0005] An oil storage tank, wherein the inlet of the oil storage tank is connected to the outlet of the regeneration equipment via a circulating cooling device;
[0006] The filter press equipment is connected to the finished oil outlet of the oil storage tank via a filter press gear pump. A purging pipe is provided between the filter press equipment and the oil storage tank, and the purging pipe is connected to a crystallization purging device.
[0007] The finished product conveying equipment is connected to the finished oil outlet of the filter press and delivers the filtered finished oil to the oil user.
[0008] Preferably, the circulating cooling device includes:
[0009] A heat exchanger, wherein the heat exchange inlet is connected to the oil outlet of the regeneration equipment, and the heat exchange outlet is connected to the finished oil inlet of the oil storage tank;
[0010] A circulation pipeline, one end of which is connected to the heat exchange inlet of the heat exchanger, and the other end of which is connected to the finished oil outlet of the oil storage tank via the filter press gear pump.
[0011] Preferably, the shell side of the heat exchanger is connected to the coolant outlet and coolant inlet of the circulating cooling device.
[0012] Preferably, the shell side of the heat exchanger is also connected to the steam outlet and steam inlet of the steam unit.
[0013] Preferably, the gas output by the crystallization purging device is nitrogen.
[0014] Preferably, the finished product conveying equipment includes a finished product tank connected to the finished oil outlet of the filter press, and the finished oil outlet of the finished product tank delivers the filtered finished oil to the oil user through a finished product gear pump.
[0015] Preferably, the finished oil inlet of the circulating cooling equipment is also connected to the crystallization purging equipment.
[0016] The above technical solution has the following advantages or beneficial effects: After the filter press operation, the crystals in the heat transfer oil are separated from the heat transfer oil. After the filter press is completed, the heat transfer oil in the filter press is purged using a crystallization purging device. When no heat transfer oil flows out of the filter press outlet, it indicates that filter cake has formed on the filter plate and frame of the filter press. Then, the filter press is disassembled, the crystals on it are cleaned, and recycled. During the heat transfer oil regeneration process, the crystals in the heat transfer oil can be effectively filtered out, improving the performance of the heat transfer oil and ensuring the safe and stable operation of the user's heat transfer oil system. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of a heat transfer oil regeneration pressure filter system, which is a preferred embodiment of the present invention. Detailed Implementation
[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within its scope.
[0019] In a preferred embodiment of this utility model, based on the above-mentioned problems existing in the prior art, a heat transfer oil regeneration pressure filtration system is provided, such as... Figure 1 As shown, it includes:
[0020] Oil storage tank 1, the finished oil inlet of oil storage tank 1 is connected to the oil outlet of regeneration equipment 3 through circulating cooling equipment 2;
[0021] The filter press 4 is connected to the finished oil outlet of the oil storage tank 1 through the filter press gear pump 5. A purging pipe 6 is provided between the filter press 4 and the oil storage tank 1, and the purging pipe 6 is connected to the crystallization purging device 7.
[0022] The finished product conveying equipment 8 is connected to the finished oil outlet of the filter press 4 and conveys the filtered finished oil to the oil user.
[0023] Specifically, this embodiment provides a heat transfer oil regeneration pressure filtration system, which includes a circulating cooling device 2. The regenerated heat transfer oil output from the regeneration device 3 is cooled by the circulating cooling device 2 before entering the oil storage tank 1. After cooling, the pressure filtration device 4 is pumped in. Through the pressure filtration operation, the crystals in the heat transfer oil are separated from the heat transfer oil. After this batch of pressure filtration is completed, a crystal purging device 7 is used to purge the heat transfer oil in the pressure filtration device 4. When no heat transfer oil flows out of the outlet of the pressure filtration device 4, it indicates that filter cake has formed on the plates and frames of the pressure filtration device 4. Then, the pressure filtration device 4 is disassembled, and the crystals on it are cleaned and recycled. After the crystals are cleaned, the filter plates and filter cloth are installed as required to prepare for the next pressure filtration operation. All the heat transfer oil at the outlet of the pressure filtration device 4 flows by gravity into the finished product conveying device 8, which outputs the filtered, crystal-free finished oil to the oil user. During the heat transfer oil regeneration process, crystals in the heat transfer oil can be effectively filtered out, improving the performance of the heat transfer oil and ensuring the safe and stable operation of the user's heat transfer oil system.
[0024] In a preferred embodiment of this invention, the circulating cooling device 2 includes:
[0025] Heat exchanger 21, the heat exchange inlet of heat exchanger 21 is connected to the oil outlet of regeneration equipment 3, and the heat exchange outlet of heat exchanger 21 is connected to the finished oil inlet of oil storage tank 1.
[0026] The circulation pipe 22 is connected at one end to the heat exchange inlet of the heat exchanger 21, and at the other end to the finished oil outlet of the oil storage tank 1 via the filter press gear pump 5.
[0027] Specifically, in this embodiment, as Figure 1 As shown, the circulating cooling equipment 2 includes a heat exchanger 21 and a circulating pipe 22. The heat transfer oil (containing crystals) produced by the regeneration equipment 3 during the online regeneration process is pumped into the heat exchanger 21 by the finished product pump in the regeneration equipment 3. The heat transfer oil cooled by the heat exchanger 21 enters the oil storage tank 1. The oil storage tank 1 is equipped with a liquid level gauge LG on its side. When the liquid level in the oil storage tank 1 reaches 80%, the feeding is stopped.
[0028] Open the return valve at the outlet of the filter press gear pump, and the heat transfer oil flows back from the oil storage tank 1 to the inlet of the heat exchanger 21 through the circulation pipe 22 for circulation and cooling. When the temperature of the heat transfer oil in the oil storage tank 1 reaches about 40°C, stop cooling and proceed with the subsequent filter press operation.
[0029] The circulating cooling device 2 pre-cools the heat transfer oil, effectively reducing its temperature to near or at the optimal temperature range for pressure filtration. Lower temperatures help reduce the fluidity of the heat transfer oil, making it easier for crystals to be retained during pressure filtration, thereby improving filtration efficiency and separation effect.
[0030] In a preferred embodiment of this invention, the shell side of the heat exchanger 21 is connected to the coolant outlet CWR and the coolant inlet CWS of the circulating cooling device.
[0031] In a preferred embodiment of this invention, the shell side of the heat exchanger is also connected to the steam outlet SC and the steam inlet LS of the steam unit.
[0032] Specifically, in this embodiment, the shell side of the heat exchanger 21 uses circulating water as the cooling medium and is equipped with a steam interface to prevent the heat exchanger 21 from being blocked by crystallization. High-temperature steam is introduced to heat and clear the blockage.
[0033] In a preferred embodiment of this invention, the gas output by the crystallization purging device 7 is nitrogen.
[0034] Specifically, nitrogen is used as the purging gas for the crystallization purging device 7. Nitrogen is an inert gas and does not readily react chemically with other substances. Therefore, during the purging process, nitrogen will not react with the heat transfer oil or the crystals within it, avoiding potential secondary pollution and corrosion problems. Nitrogen is denser than air, approximately 1.25 times denser, allowing it to better penetrate every corner of the pipes and equipment during purging, effectively removing residual heat transfer oil and crystals. This efficient purging capability helps ensure the thorough cleaning of the filter press equipment, preparing it for the next batch of heat transfer oil treatment.
[0035] In a preferred embodiment of this utility model, the finished product conveying device 8 includes a finished product tank 81, which is connected to the finished oil outlet of the filter press 4. The finished oil outlet of the finished product tank 81 delivers the filtered finished oil to the oil user through the finished product gear pump 82.
[0036] In a preferred embodiment of this invention, the finished oil inlet of the circulating cooling equipment is also connected to a crystallization purging device.
[0037] Specifically, a crystallization purging device 7 is also connected to the finished oil inlet of the circulating cooling device 2 to prevent the heat exchanger from being blocked by accumulated crystals.
[0038] Specifically, in one embodiment, the complete pressure filtration process is as follows:
[0039] Open the circulating water inlet and outlet valves of heat exchanger 21, and then open the material inlet and outlet valves of heat exchanger 21 and the inlet valve K1 of oil storage tank in sequence.
[0040] The heat transfer oil pump in regeneration equipment 3 is started to feed the oil, and the oil storage tank 1 has a volume of 5m³. 3 When the liquid level reaches 80%, stop feeding.
[0041] Open the outlet valve K2 of oil storage tank 1, open the return valve K3 of filter press gear pump 5 and oil storage tank, start filter press gear pump 5 to circulate and cool down, and start the filter press operation when the temperature drops to about 40℃.
[0042] After shutting down the circulating cooling operation, close the return valve K3 of the oil storage tank, open the inlet and outlet valves K4 and K5 of the filter press, start the gear pump 5 of the filter press, and inject the heat transfer oil into the filter press to carry out the filter pressing operation.
[0043] The finished product tank 81 connected to the outlet of the filter press 4 has a volume of approximately 0.5 m³. 3 The system is equipped with a level gauge LG. When the level reaches 70%, the finished product gear pump 81 is activated to pump the filtered heat transfer oil into the user's heat transfer oil system.
[0044] When the inlet pressure of the filter press 4 reaches 0.5MPa, it indicates that there are a large amount of crystals on the filter cloth of the filter press 4, and the crystals need to be cleaned in time.
[0045] Before cleaning the filter cloth, stop the filter press operation and use nitrogen to blow out the remaining material in the filter press 4. Only after the pressure in the filter press 4 has been released to atmospheric pressure can the filter plates be removed and the crystals on the filter cloth be cleaned. After the crystals are cleaned, install the filter plates and filter cloth as required and prepare for the next filter press operation.
[0046] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.
Claims
1. A heat transfer oil regeneration pressure filter system, characterized in that, include: An oil storage tank, wherein the inlet of the oil storage tank is connected to the outlet of the regeneration equipment via a circulating cooling device; The filter press equipment is connected to the finished oil outlet of the oil storage tank via a filter press gear pump. A purging pipe is provided between the filter press equipment and the oil storage tank, and the purging pipe is connected to a crystallization purging device. The finished product conveying equipment is connected to the finished oil outlet of the filter press and delivers the filtered finished oil to the oil user.
2. The heat transfer oil regeneration pressure filter system according to claim 1, characterized in that, The circulating cooling equipment includes: A heat exchanger, wherein the heat exchange inlet is connected to the oil outlet of the regeneration equipment, and the heat exchange outlet is connected to the finished oil inlet of the oil storage tank; A circulation pipeline, one end of which is connected to the heat exchange inlet of the heat exchanger, and the other end of which is connected to the finished oil outlet of the oil storage tank via the filter press gear pump.
3. The heat transfer oil regeneration pressure filtration system according to claim 2, characterized in that, The shell side of the heat exchanger connects the coolant outlet and coolant inlet of the circulating cooling device.
4. The heat transfer oil regeneration pressure filtration system according to claim 3, characterized in that, The shell side of the heat exchanger is also connected to the steam outlet and steam inlet of the steam unit.
5. The heat transfer oil regeneration pressure filtration system according to claim 1, characterized in that, The gas output by the crystallization purging device is nitrogen.
6. The heat transfer oil regeneration pressure filtration system according to claim 1, characterized in that, The finished product conveying equipment includes a finished product tank connected to the finished oil outlet of the filter press. The finished oil outlet of the finished product tank delivers the filtered finished oil to the oil user through a finished product gear pump.
7. The heat transfer oil regeneration pressure filtration system according to claim 1, characterized in that, The finished oil inlet of the circulating cooling equipment is also connected to the crystallization purging equipment.