Heat utilization device taking heat conduction oil as energy storage medium
By designing a heat transfer oil heat utilization device with a coiled tube structure and counter-current heat exchange method, the problems of low heat exchange efficiency and complex structure in the existing technology have been solved, realizing efficient and independent heat utilization and simplifying engineering implementation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-03-03
AI Technical Summary
In the existing technology, heat utilization devices using heat transfer oil as an energy storage medium have problems such as low heat exchange efficiency, complex structure, and dependence on external auxiliary engineering, making it difficult to efficiently utilize heat.
A heat utilization device using heat transfer oil as the energy storage medium is adopted. The heat exchangers at the high-temperature end and the heat-using end are designed with a wound tube structure and have built-in wound heat exchange tube bundles. The heat transfer oil and the medium adopt a counter-current heat exchange method. The circulating pump provides power, which simplifies the device structure and reduces the dependence on external auxiliary engineering.
It significantly improves the heat exchange area and heat transfer efficiency per unit volume, reduces energy loss, and the device is highly independent, easy to implement in engineering and operate and maintain.
Smart Images
Figure CN223965611U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of heat transfer oil heat exchange technology, specifically relating to a heat utilization device that uses heat transfer oil as an energy storage medium. Background Technology
[0002] Heat transfer oil is a type of organic heat carrier. It is a special type of oil used for indirect heat transfer and has good thermal stability. Compared with water, heat transfer oil has many advantages as an energy storage medium in terms of operating temperature range, thermal stability, specific heat capacity, and impact on equipment.
[0003] When materials are compressed, external work is done on them, increasing their internal energy and temperature. However, due to the temperature requirements of downstream processes, a water cooler or air cooler is typically required at the compressor outlet. This consumes a significant amount of circulating cooling water or electrical energy. For example, the compressor outlet temperature of the product gas from a C4 dehydrogenation unit is 165°C. It needs to be cooled to 38°C by a circulating water cooler or / and an air cooler. Because of its large flow rate and limitations imposed by downstream pressure drops, this material is difficult to utilize effectively.
[0004] CN222336155U discloses a high-efficiency heat exchange and energy cascade utilization system for thermal oil. By adding a first, second, and third flash tank to form a heat utilization device, the system performs flash evaporation treatment with progressively decreasing pressure and supplies energy to the first, second, and third steam users with different temperature requirements. This achieves cascade utilization of steam energy, significantly improving thermal efficiency and reducing energy consumption. However, the process is relatively cumbersome, requiring three flash tanks to be connected in series, and each flash tank needs to be connected to a separate output pipeline to different users, resulting in a complex pipeline layout.
[0005] Therefore, it is particularly important to design a heat transfer oil heat exchanger with high heat exchange efficiency and simple structure to realize the utilization of heat. Utility Model Content
[0006] The purpose of this invention is to overcome the defects of the existing technology and provide a heat utilization device that uses heat transfer oil as the energy storage medium. This device realizes the heat transfer between the heat source and the heat-using end. The device is relatively independent and does not rely on external auxiliary engineering except for electricity. It is easy to implement in engineering and simple to operate and maintain in daily life. At the same time, by designing the heat exchanger, the heat exchange area per unit volume is greatly increased, the heat transfer effect is further optimized, and the efficiency of heat energy utilization is improved.
[0007] The heat utilization device using heat transfer oil as the energy storage medium according to this utility model includes an oil storage tank. The oil storage tank is connected to an oil-gas separator via an injection pump. The bottom of the oil-gas separator is connected to a circulating pump unit. The circulating pump unit consists of two circulating pumps, A and B, connected in parallel. After the outlets of the two pumps converge, they are divided into two branches: one branch is connected to the bottom heat transfer oil inlet A of the high-temperature end heat exchanger via an electric heater, and the other branch is directly connected to the bottom heat transfer oil inlet A of the high-temperature end heat exchanger. The top of the high-temperature end heat exchanger is connected to the heat-using end heat exchanger, and the heat-using end heat exchanger is provided with a pipeline connected to the oil-gas separator. The oil-gas separator is connected to an expansion oil tank, and the expansion oil tank is provided with a pipeline for return flow to the oil storage tank. A vent valve is provided on the expansion oil tank.
[0008] Preferably, the oil storage tank is provided with a pipeline connected to the oil filling port, a level gauge is provided on the oil storage tank, and a vent valve is provided on the top. Furthermore, the level gauge is installed on the side wall of the oil storage tank.
[0009] Preferably, the high-temperature end heat exchanger has a high-temperature end medium inlet and a high-temperature end medium outlet arranged from top to bottom on its side wall. The high-temperature end medium inlet is connected to the high-temperature end medium injection pipeline, and the high-temperature end medium outlet is connected to the high-temperature end medium outflow pipeline.
[0010] Preferably, the high-temperature end heat exchanger is provided with a heat transfer oil inlet A at the bottom, and a wound heat exchange tube bundle is provided inside the high-temperature end heat exchanger. The wound heat exchange tube bundle connects the heat transfer oil outlet A and the heat transfer oil inlet A, and is used to transport heat transfer oil. A shell cavity A is formed between the wound heat exchange tube bundle and the shell of the high-temperature end heat exchanger. The shell cavity A connects the high-temperature end medium inlet and the high-temperature end medium outlet, and is used to transport the high-temperature end medium.
[0011] Preferably, the pipe at the top of the high-temperature end heat exchanger is connected to the heat-using end heat exchanger in two ways: one is connected to the heat transfer oil inlet B on the upper side wall of the heat-using end heat exchanger, and the other is connected to the heat transfer oil inlet C at the bottom of the heat-using end heat exchanger.
[0012] Preferably, the sidewall of the heat exchanger at the heat-using end is provided with a heat-using end medium outlet and a heat-using end medium inlet from top to bottom. The heat-using end medium outlet is connected to the heat-using end medium outflow pipeline, and the heat-using end medium inlet is connected to the heat-using end medium injection pipeline. A heat transfer oil outlet C is provided at the top of the heat exchanger, and the heat-using end medium outlet is located below the heat transfer oil inlet B. A heat transfer oil outlet B is provided on the sidewall opposite to the heat-using end medium inlet, and the heat transfer oil inlet B is connected to the heat transfer oil outlet B through an outer layer of wound heat exchange tube bundle.
[0013] Preferably, the heat transfer oil outlet C is connected to the heat transfer oil inlet C through the inner tube; the outer layer of wound heat exchange tube bundle is located around the inner tube, and a shell cavity B is formed between the outer layer of wound heat exchange tube bundle, the inner tube, and the outer shell of the heat-using end heat exchanger. The shell cavity B is connected to the heat-using end medium outlet and the heat-using end medium inlet; furthermore, the outer layer of wound heat exchange tube bundle and the inner tube are used to transport heat transfer oil, and the shell cavity B is used to transport the heat-using end medium.
[0014] Preferably, the heat transfer oil outlets B and C transport the heat transfer oil to the oil-gas separator via pipelines.
[0015] Specifically, the above-mentioned heat utilization device using heat transfer oil as the energy storage medium operates as follows: heat transfer oil is injected into the oil storage tank through the oil inlet, and then transported to the subsequent heat exchange device via the injection pump, oil-gas separator, and circulating pump unit; during normal operation of the subsequent heat exchange device, the heat transfer oil is bypassed by the electric heater and sent to the high-temperature end heat exchanger, where it exchanges heat with the high-temperature end medium in a countercurrent manner. After being heated, the heat transfer oil is sent to the heat-using end heat exchanger in two paths, serving as a heat source to provide heat to the heat-using end medium. The heat-utilized heat transfer oil returns to the oil-gas separator, with the gas phase entering the expansion oil tank and the liquid phase re-entering the circulating pump for circulation; during the initial start-up phase, fresh heat transfer oil is injected into the oil storage tank through the oil inlet. Due to the low temperature, an electric heater is used for initial temperature rise to ensure stable operation of the device.
[0016] Among them, the high-temperature end heat exchanger and the heat-using end heat exchanger adopt the coiled tube heat exchanger. In the high-temperature end heat exchanger: the heat transfer oil enters from the bottom heat transfer oil inlet A, flows out from the top heat transfer oil outlet A after being wound around the heat exchange tube bundle, and the high-temperature end medium enters the shell cavity A from the high-temperature end medium inlet at the upper part of the side wall, exchanges heat with the heat transfer oil, and flows out from the high-temperature end medium outlet at the lower part of the side wall after the heat exchange is completed. The heat transfer oil and the high-temperature end medium are in a counter-current state during the heat exchange process.
[0017] In the heat exchanger at the heat-consuming end: the heat-conducting oil after heat storage flows out from the high-temperature end heat exchanger and enters the heat-consuming end heat exchanger in two ways. One way enters from the bottom of the heat-consuming end heat exchanger and is transported through the inner tube. The other way enters the outer layer of wound heat exchange tube bundle through the heat-conducting oil inlet B on the side wall of the heat-consuming end heat exchanger. The heat-conducting oil in the inner tube and the heat-conducting oil in the outer layer of wound heat exchange tube bundle flow in countercurrent. The heat-consuming medium enters the shell cavity B through the heat-consuming medium inlet for heat exchange. After the heat exchange is completed, the heat-consuming medium flows out from the heat-consuming medium outlet. After the heat exchange is completed, the heat-conducting oil flows out through the heat-conducting oil outlet B and the heat-conducting oil outlet C and flows back to the oil-gas separator for gas-liquid separation.
[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: the heat utilization device using heat transfer oil as the energy storage medium adopts a wound tube structure for both the high-temperature end heat exchanger and the heat-using end heat exchanger, and has a built-in wound heat exchange tube bundle, which significantly increases the heat exchange area and enhances the heat transfer efficiency between the heat transfer oil and the medium. The heat transfer oil and the high-temperature end medium and the heat-using end medium all adopt a counter-current heat exchange method, which maximizes the utilization of temperature difference, improves heat exchange efficiency, and reduces energy loss. The circulation of heat transfer oil is powered by a circulation pump, which is less affected by spatial arrangement and has strong adaptability. The device is relatively independent and does not rely on external auxiliary engineering except for electricity. The process is simple and easy to implement in engineering. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the heat utilization device using heat transfer oil as the energy storage medium in this utility model.
[0020] Figure 2 This is a schematic diagram of the high-temperature end heat exchanger of this utility model;
[0021] Figure 3 This is a schematic diagram of the structure of the heat exchanger used in this utility model.
[0022] In the diagram: 1. Oil storage tank; 2. Oil-gas separator; 3. Expansion oil tank; 4. Electric heater; 5. High-temperature end heat exchanger; 501. High-temperature end medium outlet; 502. High-temperature end medium inlet; 503. Heat transfer oil outlet A; 504. Heat transfer oil inlet A; 505. Winded heat exchanger tube bundle; 506. Shell cavity A; 6. Heat-using end heat exchanger; 601. Heat transfer oil inlet B; 602. Heat-using end medium outlet; 603. Heat-using end medium inlet; 60 4. Heat transfer oil outlet B; 605. Heat transfer oil inlet C; 606. Heat transfer oil outlet C; 607. Inner tube; 608. Outer layer wound heat exchange tube bundle; 609. Shell cavity B; 7. Oil inlet; 8. Injection pump; 9. Circulation pump A; 10. Circulation pump B; 11. High-temperature end medium outflow pipeline; 12. High-temperature end medium injection pipeline; 13. Hot end medium outflow pipeline; 14. Hot end medium injection pipeline; 15. Level gauge; 16. Vent valve. Detailed Implementation
[0023] The technical solution of this utility model will be further described below with reference to the specific accompanying drawings.
[0024] like Figures 1-3As shown, the heat utilization device using heat transfer oil as the energy storage medium includes an oil storage tank 1. The oil storage tank 1 is connected to an oil-gas separator 2 via an injection pump 8. The bottom of the oil-gas separator 2 is connected to a circulating pump unit. The outlet of the circulating pump unit is provided with a pipeline connected to an electric heater 4. The electric heater 4 is connected to the bottom of a high-temperature end heat exchanger 5. The top of the high-temperature end heat exchanger 5 is connected to a heat-using end heat exchanger 6. The heat-using end heat exchanger 6 is provided with a pipeline connected to the oil-gas separator 2. The oil-gas separator 2 is connected to an expansion oil tank 3. The expansion oil tank 3 is provided with a pipeline connected to the oil storage tank 1. An vent valve 16 is provided on the expansion oil tank 3.
[0025] The oil storage tank 1 is equipped with a pipeline connected to the oil filling port 7, a level gauge 15 is installed on the oil storage tank 1, and a vent valve 16 is installed on the top.
[0026] The circulating pump unit consists of circulating pumps A9 and B10 connected in parallel. The outlet of the circulating pump unit is divided into two branches: one is directly connected to the bottom of the high-temperature end heat exchanger 5, and the other is connected to the bottom of the high-temperature end heat exchanger 5 through the electric heater 4.
[0027] The high-temperature end heat exchanger 5 has a high-temperature end medium inlet 502 and a high-temperature end medium outlet 501 arranged from top to bottom on its side wall; the high-temperature end heat exchanger 5 has a heat transfer oil inlet A504 at the bottom and a heat transfer oil outlet A503 at the top; the high-temperature end heat exchanger 5 has a wound heat exchange tube bundle 505 inside, which connects the heat transfer oil outlet A503 and the heat transfer oil inlet A504; a shell cavity A506 is formed between the wound heat exchange tube bundle 505 and the outer shell of the high-temperature end heat exchanger 5, which connects the high-temperature end medium inlet 502 and the high-temperature end medium outlet 501.
[0028] The high-temperature end medium inlet 502 is connected to the high-temperature end medium injection pipeline 12, and the high-temperature end medium outlet 501 is connected to the high-temperature end medium outflow pipeline 11.
[0029] The pipes at the top of the high-temperature heat exchanger 5 are connected to the heat-using heat exchanger 6 in two ways: one is connected to the heat transfer oil inlet B601 on the upper side wall of the heat-using heat exchanger 6, and the other is connected to the heat transfer oil inlet C605 at the bottom of the heat-using heat exchanger 6.
[0030] The heat exchanger 6 has a heat-use medium outlet 602 and a heat-use medium inlet 603 arranged from top to bottom on its side wall. The heat-use medium outlet 602 is connected to the heat-use medium outflow pipe 13, and the heat-use medium inlet 603 is connected to the heat-use medium injection pipe 14. A heat transfer oil outlet C606 is provided at the top of the heat exchanger 6, and the heat-use medium outlet 602 is located below the heat transfer oil inlet B601. A heat transfer oil outlet B604 is provided on the side wall opposite to the heat-use medium inlet 603, and the heat transfer oil inlet B601 is connected to the heat transfer oil outlet B604 through an outer layer of wound heat exchange tube bundle 608.
[0031] The heat transfer oil outlet C606 is connected to the heat transfer oil inlet C605 through the inner tube 607; the outer layer wound heat exchange tube bundle 608 is located around the inner tube 607, and a shell cavity B609 is formed between the outer layer wound heat exchange tube bundle 608, the inner tube 607 and the outer shell of the heat-using end heat exchanger 6, and the shell cavity B609 is connected to the heat-using end medium outlet 602 and the heat-using end medium inlet 603.
[0032] The heat transfer oil outlets B604 and C606 are equipped with pipelines connected to the oil-gas separator 2.
[0033] Specifically, the working process of the above-mentioned device is as follows: heat transfer oil is injected into the oil storage tank 1 through the oil injection port 7, and then transported to the subsequent heat exchange device through the injection pump 8, oil-gas separator 2, and circulating pump unit (circulating pump A9 / circulating pump B10); when the subsequent heat exchange device is operating normally, the heat transfer oil is bypassed to the high-temperature end heat exchanger 5 through the electric heater 4, and exchanges heat with the high-temperature end medium in the high-temperature end heat exchanger 5 in a countercurrent manner. After being heated, the heat transfer oil is sent to the heat-using end heat exchanger 6 in two paths as a heat source to provide heat to the heat-using end medium. The heat-using oil after heat utilization returns to the oil-gas separator 2, the gas phase enters the expansion oil tank 3, and the liquid phase re-enters the circulating pump (circulating pump A9 / circulating pump B10) for circulation; at the beginning of start-up, fresh heat transfer oil is injected into the oil storage tank 1 through the oil injection port 7. Because the temperature is low, the electric heater 4 is used for initial temperature rise to ensure stable operation of the device.
[0034] Among them, the high-temperature end heat exchanger 5 and the heat-using end heat exchanger 6 adopt the coiled tube type heat exchanger. In the high-temperature end heat exchanger 5: the heat transfer oil enters from the bottom heat transfer oil inlet A504, flows out from the top heat transfer oil outlet A503 after passing through the coiled heat exchange tube bundle 505, and the high-temperature end medium enters the shell cavity A506 from the high-temperature end medium inlet 502 at the upper part of the side wall to exchange heat with the heat transfer oil. After the heat exchange is completed, it flows out from the high-temperature end medium outlet 501 at the lower part of the side wall. The heat transfer oil and the high-temperature end medium are in a counter-current state during the heat exchange process.
[0035] In the heat exchanger 6 at the hot end: the heat-conducting oil after heat storage flows out from the heat exchanger 5 at the high temperature end and enters the heat exchanger 6 at the hot end in two ways. One way enters from the bottom of the heat exchanger 6 at the hot end and is transported through the inner tube 607. The other way enters the outer layer wound heat exchange tube bundle 608 through the heat-conducting oil inlet B601 on the side wall of the heat exchanger 6 at the hot end. The heat-conducting oil in the inner tube 607 and the heat-conducting oil in the outer layer wound heat exchange tube bundle 608 flow in opposite directions. The heat-conducting medium enters the shell cavity B609 through the heat-conducting medium inlet 603 for heat exchange. After the heat exchange is completed, the heat-conducting medium flows out from the heat-conducting medium outlet 602. After the heat exchange is completed, the heat-conducting oil flows out through the heat-conducting oil outlet B604 and the heat-conducting oil outlet C606 and flows back to the oil-gas separator 2 for gas-liquid separation.
Claims
1. A heat utilization device using heat transfer oil as the energy storage medium, characterized in that, The system includes an oil storage tank (1), which is connected to an oil-gas separator (2) via an injection pump (8). The bottom of the oil-gas separator (2) is connected to a circulating pump unit. The outlet of the circulating pump unit is provided with a pipeline connected to an electric heater (4). The electric heater (4) is connected to the bottom of a high-temperature heat exchanger (5). The top of the high-temperature heat exchanger (5) is connected to a heat-using heat exchanger (6). The heat-using heat exchanger (6) is provided with a pipeline connected to the oil-gas separator (2). The oil-gas separator (2) is connected to an expansion oil tank (3), which is provided with a pipeline connected to the oil storage tank (1).
2. The heat utilization device using heat transfer oil as the energy storage medium according to claim 1, characterized in that, The oil storage tank (1) is equipped with a pipeline connected to the oil inlet (7), a level gauge (15) is installed on the oil storage tank (1), and a vent valve (16) is installed on the top.
3. The heat utilization device using heat transfer oil as the energy storage medium according to claim 1, characterized in that, The circulating pump unit consists of circulating pump A (9) and circulating pump B (10) connected in parallel. The outlet of the circulating pump unit is divided into two branches: one is directly connected to the bottom of the high-temperature end heat exchanger (5), and the other is connected to the bottom of the high-temperature end heat exchanger (5) through the electric heater (4).
4. The heat utilization device using heat transfer oil as the energy storage medium according to claim 1, characterized in that, The high-temperature end heat exchanger (5) has a high-temperature end medium inlet (502) and a high-temperature end medium outlet (501) arranged from top to bottom on its side wall; the high-temperature end heat exchanger (5) has a heat transfer oil outlet A (503) at the top and a heat transfer oil inlet A (504) at the bottom; the high-temperature end heat exchanger (5) has a wound heat exchange tube bundle (505) inside, which connects the heat transfer oil outlet A (503) and the heat transfer oil inlet A (504); the wound heat exchange tube bundle (505) and the outer shell of the high-temperature end heat exchanger (5) form a shell cavity A (506), which connects the high-temperature end medium outlet (501) and the high-temperature end medium inlet (502).
5. The heat utilization device using heat transfer oil as the energy storage medium according to claim 4, characterized in that, The high-temperature end medium inlet (502) is connected to the high-temperature end medium injection pipeline (12), and the high-temperature end medium outlet (501) is connected to the high-temperature end medium outflow pipeline (11).
6. The heat utilization device using heat transfer oil as the energy storage medium according to claim 1, characterized in that, The pipes at the top of the high-temperature heat exchanger (5) are connected to the heat-using heat exchanger (6) in two ways. One way is connected to the heat transfer oil inlet B (601) on the upper side wall of the heat-using heat exchanger (6), and the other way is connected to the heat transfer oil inlet C (605) at the bottom of the heat-using heat exchanger (6).
7. The heat utilization device using heat transfer oil as the energy storage medium according to claim 6, characterized in that, The heat exchanger (6) has a heat-use medium outlet (602) and a heat-use medium inlet (603) arranged from top to bottom on its side wall. The heat-use medium outlet (602) is connected to the heat-use medium outflow pipe (13), and the heat-use medium inlet (603) is connected to the heat-use medium injection pipe (14). The heat exchanger (6) has a heat transfer oil outlet C (606) at the top, and the heat-use medium outlet (602) is located below the heat transfer oil inlet B (601). The heat transfer oil outlet B (604) is arranged on the side wall opposite to the heat-use medium inlet (603). The heat transfer oil inlet B (601) is connected to the heat transfer oil outlet B (604) through the outer layer of wound heat exchange tube bundle (608).
8. The heat utilization device using heat transfer oil as the energy storage medium according to claim 7, characterized in that, The heat transfer oil outlet C (606) is connected to the heat transfer oil inlet C (605) through the inner tube (607); the outer layer wound heat exchange tube bundle (608) is located around the inner tube (607), and a shell cavity B (609) is formed between the outer layer wound heat exchange tube bundle (608), the inner tube (607) and the outer shell of the heat-using end heat exchanger (6), and the shell cavity B (609) is connected to the heat-using end medium outlet (602) and the heat-using end medium inlet (603).
9. The heat utilization device using heat transfer oil as the energy storage medium according to claim 7, characterized in that, The heat transfer oil outlets B (604) and C (606) are provided with pipelines connected to the oil-gas separator (2).
10. The heat utilization device using heat transfer oil as the energy storage medium according to claim 1, characterized in that, The expansion oil tank (3) is equipped with a vent valve (16).