Heat conduction oil efficient heat exchange and energy gradient utilization system

Abstract

The utility model relates to the technical field of energy conservation and heat exchange, in particular to a heat conduction oil efficient heat exchange and energy gradient utilization system. Comprising a heat exchanger, a steam heat supply station, a steam outlet pipeline arranged between the steam heat supply station and the heat exchanger, a heat-conducting oil user side, a heat-conducting oil pipeline arranged between the heat-conducting oil user side and the heat exchanger, and a heat-conducting oil circulating pump installed on the heat-conducting oil pipeline. According to the steam-heat-conducting oil heat exchange system, an original steam-heat-conducting oil heat exchange system is scientifically and reasonably improved, the first flash tank, the second flash tank, the third flash tank and the corresponding output pipelines are arranged on the steam inlet pipeline, and steam is supplied to steam user sides with different pressure and temperature requirements; the working energy consumption caused by the temperature difference in the steam circulation heating process is effectively reduced, meanwhile, the used steam heat is utilized in a multi-stage mode, the heat loss in the whole heat exchange process is reduced, and therefore the heat utilization efficiency of the heat exchange system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy saving and heat exchange, in particular to a heat transfer oil high-efficiency heat exchange and energy cascade utilization system. Background Art

[0002] Thermal oil is a type of special oil with good thermal stability used for indirect heat transfer. It is widely used in heat conduction applications in industrial heating, petrochemical industry, solar water heating systems, food processing and pharmaceutical manufacturing due to its uniform heating, accurate temperature control, ability to generate high temperature under low vapor pressure, high thermal conductivity, low toxicity, easy transportation and operation.

[0003] The heating methods of thermal oil are usually divided into two methods: coal, oil, gas combustion and electric indirect heating. Based on the different heat source construction conditions of each enterprise and the characteristics of their use of thermal oil, the heat source is basically decentralized. Using coal, oil, gas, etc. as fuel to heat the thermal oil through a boiler has brought about a series of problems such as low comprehensive energy utilization efficiency, large social comprehensive investment, high operating costs, serious environmental pollution and high governance costs. In order to change the current situation of decentralized heating, it is now generally adopted to replace small boilers through unified planning of heat sources, reduce environmental pollution, adjust the heating structure of the park, and promote the use of centralized heating methods.

[0004] like Figure 2 As shown in the figure, it is a common steam-thermal oil heat exchange system currently on the market. The structure of this system is relatively simple. The steam heat of the steam heating station is transported to the heat exchanger through the steam outlet pipeline, and the thermal oil in the heat exchanger is heated by conduction. The used steam will circulate through the steam return pipeline into the steam heating station for reheating. This system has the following shortcomings in the actual working process: The thermal oil is usually used at a temperature of 150-280°C. In order to heat it, the required steam temperature is 180-300 and above, and the corresponding steam pressure is 1-9MPa. After heat exchange in the heat exchanger, the pressure value of the discharged steam condensate is only 0.1-0.5MPa, and the temperature is still 150-280°C. This part of the heat is not fully utilized, and because the steam condensate has a high pressure and high temperature, it is difficult and costly to transport it back to the steam heating station.

[0005] In view of this, it is particularly important to design and manufacture a steam-thermal oil heat exchange system with high thermal efficiency, effective reduction of heat wheel loss and improved thermal energy utilization in the heat exchange system. Utility Model Content

[0006] The purpose of the utility model is to solve the problem that in the traditional steam-heat transfer oil heat exchange system, part of the heat is not fully utilized after the heat exchange in the heat exchanger, resulting in the loss of unutilized heat energy, and to propose a heat transfer oil high-efficiency heat exchange and energy cascade utilization system.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A heat transfer oil efficient heat exchange and energy cascade utilization system comprises a heat exchanger, a steam heating station, a steam outlet pipeline arranged between the steam heating station and the heat exchanger, a heat transfer oil user end, a heat transfer oil pipeline arranged between the heat transfer oil user end and the heat exchanger, and a heat transfer oil circulation pump installed on the heat transfer oil pipeline, wherein a first steam user end, a second steam user end and a third steam user end are respectively arranged outside the heat exchanger, and a heat utilization device for comprehensive utilization of steam waste heat is arranged between the heat exchanger and the first steam user end, the second steam user end and the third steam user end.

[0009] As a further description of the above technical solution:

[0010] The heat utilization equipment includes a first flash tank, a second flash tank and a third flash tank outside the heat exchanger, and a steam inlet pipeline connected end to end with the first flash tank, the second flash tank and the third flash tank is installed at the tail end of the steam outlet pipeline.

[0011] As a further description of the above technical solution:

[0012] A condensation water tank is arranged outside the third flash tank, and the tail end of the steam intake pipeline extends to the inner side of the condensation water tank.

[0013] As a further description of the above technical solution:

[0014] The first flash tank is connected to the first steam user end via a first output pipeline, and a first pressure control valve connected to the steam inlet pipeline on the heat exchanger is installed at the steam inlet of the first flash tank.

[0015] As a further description of the above technical solution:

[0016] The second flash tank is connected to the second steam user end via a second output pipeline, and the steam inlet of the second flash tank is equipped with a second pressure control valve connected to the steam inlet pipeline on the first flash tank.

[0017] As a further description of the above technical solution:

[0018] The third flash tank is connected to the third steam user end via a third output pipeline, and the steam inlet of the third flash tank is equipped with a third pressure control valve connected to the steam inlet pipeline on the second flash tank.

[0019] As a further description of the above technical solution:

[0020] The heat transfer oil used in the system is heated by a heat exchanger, and is not limited to running only through the shell side or only through the tube side.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0022] In the utility model, the original steam-heat transfer oil heat exchange system is scientifically and rationally improved, and the first flash tank, the second flash tank, the third flash tank and the corresponding output pipeline are arranged on the steam intake pipeline to supply steam users with different temperature requirements. The steam condensate after use by the heat exchanger can enter the first flash tank, the second flash tank and the third flash tank in sequence through the steam intake pipeline, and the liquid in the first flash tank, the second flash tank and the third flash tank is subjected to a step-by-step flash evaporation treatment. The tank temperatures in the first flash tank, the second flash tank and the third flash tank are reduced in sequence. The final steam condensate temperature value can be reduced to 100°C through three-stage flash evaporation, thereby meeting the supply requirements of steam users in different pressure ranges. This structure effectively reduces the working energy consumption caused by the temperature difference in steam circulation heating, and at the same time, the used steam heat is utilized in multiple stages, thereby improving the thermal utilization efficiency of the heat exchange system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A heat transfer oil high-efficiency heat exchange and energy cascade utilization system proposed by the utility model Figure 1 ;

[0024] Figure 2 This is a diagram of a steam-thermal oil heat exchange system in the prior art.

[0025] Legend:

[0026] 1. Heat exchanger; 2. Steam heating station; 201. Steam outlet pipeline; 202. Steam inlet pipeline; 3. Thermal oil user end; 301. Thermal oil pipeline; 302. Thermal oil circulation pump; 4. First flash tank; 5. Second flash tank; 6. Third flash tank; 7. First steam user end; 701. First output pipeline; 702. First pressure control valve; 8. Second steam user end; 801. Second output pipeline; 802. Second pressure control valve; 9. Third steam user end; 901. Third output pipeline; 902. Third pressure control valve; 10. Condensate tank. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1 and Figure 2 The utility model provides a technical solution: a heat transfer oil efficient heat exchange and energy cascade utilization system, comprising a heat exchanger 1, a steam heating station 2, a steam outlet pipeline 201 arranged between the steam heating station 2 and the heat exchanger 1, a heat transfer oil user terminal 3, a heat transfer oil pipeline 301 arranged between the heat transfer oil user terminal 3 and the heat exchanger 1, and a heat transfer oil circulation pump 302 installed on the heat transfer oil pipeline 301, the outside of the heat exchanger 1 is respectively provided with a first steam user terminal 7, a second steam user terminal 8 and a third steam user terminal 9, and a heat utilization device for comprehensive utilization of steam waste heat is arranged between the heat exchanger 1 and the first steam user terminal 7, the second steam user terminal 8 and the third steam user terminal 9.

[0029] Specifically, Figure 1 As shown, the heat utilization equipment includes a first flash tank 4, a second flash tank 5 and a third flash tank 6 outside the heat exchanger 1, and a steam inlet pipeline 202 connected end to end with the first flash tank 4, the second flash tank 5 and the third flash tank 6 is installed at the tail end of the steam outlet pipeline 201. The steam can pass through the first flash tank 4, the second flash tank 5 and the third flash tank 6 in sequence through the steam inlet pipeline 202 to heat the liquid in the first flash tank 4, the second flash tank 5 and the third flash tank 6. Since the temperature of the steam is also utilized layer by layer, the temperature of the hot water in the first flash tank 4, the second flash tank 5 and the third flash tank 6 also decreases accordingly. Among them, a condensation water tank 10 is arranged outside the third flash tank 6, and the tail end of the steam inlet pipeline 202 extends to the inner side of the condensation water tank 10. The steam after comprehensive use will be condensed in the condensation water tank 10, and the condensed water after condensation can be supplied to the steam heating station 2 through the pipeline, thereby replenishing the steam heating station 2 with water.

[0030] Specifically, Figure 1As shown, a connection is established between the first flash tank 4 and the first steam user end 7 via a first output pipeline 701, and a first pressure control valve 702 connected to the steam inlet pipeline 202 on the heat exchanger 1 is installed at the steam inlet of the first flash tank 4, which is used to adjust the pressure of the steam entering the first flash tank 4 through the steam inlet pipeline 202 of the heat exchanger 1, and a connection is established between the second flash tank 5 and the second steam user end 8 via a second output pipeline 801, and a first pressure control valve 702 connected to the steam inlet pipeline 202 on the first flash tank 4 is installed at the steam inlet of the first flash tank 4. The second pressure control valve 802 connected to the steam pipeline 202 is used to adjust the pressure of steam entering the second flash tank 5 through the steam inlet pipeline 202 of the first flash tank 4. The third flash tank 6 and the third steam user end 9 are connected via the third output pipeline 901. The steam inlet of the third flash tank 6 is equipped with a third pressure control valve 902 connected to the steam inlet pipeline 202 on the second flash tank 5, which is used to adjust the pressure of steam entering the third flash tank 6 through the steam inlet pipeline 202 of the second flash tank 5.

[0031] The heat transfer oil used in the system is heated by the heat exchanger 1 and is not limited to the shell side or the tube side, so it can meet the application requirements in different usage scenarios.

[0032] Among them, the heat exchange system monitors the heat exchanger liquid level, temperature and pressure on each level of pipeline according to the different heat requirements of the heat transfer oil. By controlling each pressure regulating valve and adjusting related parameters, it can provide heat to steam users with different needs at all levels and realize the tiered utilization of steam energy.

[0033] Working principle: When in use, the steam heating station 2 will generate high-temperature steam when working, and the high-temperature steam can enter the heat exchanger 1 through the steam outlet pipe 201, so as to conduct and heat the heat transfer oil in the heat exchanger 1. At the same time, the heat transfer oil in the heat exchanger 1 will circulate into the heat transfer oil user end 3 under the action of the heat transfer oil circulation pump 302, and be supplied to the heat transfer oil user end 3 for use. The steam used in the heat exchanger 1 will enter the first flash tank 4, the second flash tank 5 and the third flash tank 6 in turn under the action of the steam inlet pipe 202, and the first flash tank 4, the second flash tank 5 and the third flash tank 6 will be heated. The liquid in the first flash tank 4, the second flash tank 5 and the third flash tank 6 is subjected to a step-by-step heating treatment. At this time, the temperature range of the hot water in the first flash tank 4, the second flash tank 5 and the third flash tank 6 gradually decreases. The high-temperature hot water can be supplied to the first steam user end 7 through the first output pipeline 701, the medium-temperature hot water can be supplied to the second steam user end 8 through the second output pipeline 801, and the low-temperature hot water can be supplied to the third steam user end 9 through the third output pipeline 901, thereby realizing the supply demand for hot water in different temperature ranges. The steam after comprehensive use will enter the condensation water tank 10 for condensation treatment, thereby realizing the multi-stage step-by-step utilization treatment of the steam heat.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A heat transfer oil high-efficiency heat exchange and energy cascade utilization system, comprising a heat exchanger (1), a steam heating station (2), a steam outlet pipeline (201) arranged between the steam heating station (2) and the heat exchanger (1), a heat transfer oil user end (3), a heat transfer oil pipeline (301) arranged between the heat transfer oil user end (3) and the heat exchanger (1), and a heat transfer oil circulation pump (302) installed on the heat transfer oil pipeline (301), characterized in that: A first steam user end (7), a second steam user end (8) and a third steam user end (9) are respectively arranged outside the heat exchanger (1), and a heat utilization device for comprehensive utilization of steam waste heat is arranged between the heat exchanger (1) and the first steam user end (7), the second steam user end (8) and the third steam user end (9).

2. A heat transfer oil efficient heat exchange and energy cascade utilization system according to claim 1, characterized in that: The heat utilization device comprises a first flash tank (4), a second flash tank (5) and a third flash tank (6) outside the heat exchanger (1), and a steam inlet pipeline (202) connected end to end with the first flash tank (4), the second flash tank (5) and the third flash tank (6) is installed at the tail end of the steam outlet pipeline (201).

3. A heat transfer oil efficient heat exchange and energy cascade utilization system according to claim 2, characterized in that: A condensate water tank (10) is disposed outside the third flash tank (6), and the tail end of the steam intake pipeline (202) extends to the inside of the condensate water tank (10).

4. A heat transfer oil efficient heat exchange and energy cascade utilization system according to claim 2, characterized in that: The first flash tank (4) is connected to the first steam user end (7) via a first output pipeline (701), and the steam inlet of the first flash tank (4) is provided with a first pressure control valve (702) which is connected to the steam inlet pipeline (202) on the heat exchanger (1).

5. A heat transfer oil efficient heat exchange and energy cascade utilization system according to claim 2, characterized in that: The second flash tank (5) and the second steam user end (8) are connected via a second output pipeline (801), and a second pressure control valve (802) connected to the steam inlet pipeline (202) on the first flash tank (4) is installed at the steam inlet of the second flash tank (5).

6. A heat transfer oil efficient heat exchange and energy cascade utilization system according to claim 2, characterized in that: The third flash tank (6) is connected to the third steam user end (9) via a third output pipeline (901), and the steam inlet of the third flash tank (6) is provided with a third pressure control valve (902) which is connected to the steam inlet pipeline (202) on the second flash tank (5).

7. The heat transfer oil efficient heat exchange and energy cascade utilization system according to claim 1 is characterized in that: The heat transfer oil used in the system is heated by a heat exchanger (1), and is not limited to only passing through the shell side or only passing through the tube side.

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