Different-stroke type low-temperature and constant-temperature heat conduction oil system

Abstract

The utility model discloses a different-stroke type low-temperature and constant-temperature heat conduction oil system which comprises a different-stroke type low-temperature and constant-temperature heat conduction oil assembly, a high-temperature heat conduction oil inlet header pipe and a high-temperature heat conduction oil return header pipe. The different-stroke type low-temperature constant-temperature heat conduction oil assembly comprises a buffer tank, a circulating pump, a first shell-and-tube heat exchanger, a second shell-and-tube heat exchanger and oil using equipment. The buffer tank, the first connecting pipe, the tube pass of the first shell-and-tube heat exchanger, the second connecting pipe, the shell pass of the second shell-and-tube heat exchanger, the constant-temperature heat-conducting oil conveying pipe, the oil using equipment, the constant-temperature heat-conducting oil return pipe and the buffer tank are communicated in sequence; the circulating pump is arranged on the first connecting pipe; thermometers are arranged on the second connecting pipe and the constant-temperature heat-conducting oil conveying pipe; the high-temperature heat conduction oil inlet header pipe provides high-temperature heat conduction oil for the shell pass of the first shell-and-tube heat exchanger and the tube pass of the second shell-and-tube heat exchanger, and the heat conduction oil obtained after heat exchange enters the high-temperature heat conduction oil return header pipe. According to the system, equipment damage is reduced, and safety and temperature control accuracy are improved.

Description

Technical Field

[0001] The utility model relates to a different-program low-temperature constant-temperature heat transfer oil system, belonging to the technical field of low-temperature constant-temperature heat transfer oil systems. Background Art

[0002] Thermal oil is a heat transfer medium that is resistant to thermal cracking and chemical oxidation, has good heat transfer efficiency, fast heat dissipation, and good thermal stability. It can meet the process requirements of heating and cooling at different temperatures within a wider temperature range.

[0003] Heat sources are required for rosin melting, material pipeline insulation, pelletizers, and other equipment. Steam is generally used for these purposes. However, steam insulation has issues such as high heat loss, high pipeline design pressure requirements, significant damage to seamless pipes caused by high-temperature water, and the need for separate equipment to generate high-temperature steam at high temperatures. Utility Model Content

[0004] In response to the above-mentioned defects of the prior art, the utility model provides a differential-flow low-temperature constant-temperature heat transfer oil system. By differentially exchanging the heat transfer oil in two-stage shell and tube heat exchangers, the safety and temperature control accuracy are improved. At the same time, the high-temperature heat transfer oil inlet of the differential-flow series-connected shell and tube heat exchangers is controlled by an automatic temperature control valve, so that a low-temperature constant-temperature heat transfer oil with a more accurate temperature can be obtained. The system can be used for heat preservation of equipment such as rosin melting, pipeline insulation, and granulators, overcoming the problems of high heat loss, high pipeline requirements, and severe pipeline damage in the existing water vapor insulation technology for equipment such as rosin melting, pipeline insulation, and granulators.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] A different-stage low-temperature constant-temperature heat transfer oil system, comprising a different-stage low-temperature constant-temperature heat transfer oil component, a high-temperature heat transfer oil inlet main pipe and a high-temperature heat transfer oil return main pipe;

[0007] The different-flow low-temperature constant-temperature heat transfer oil assembly includes a buffer tank, a circulation pump, a first shell and tube heat exchanger, a first connecting pipe, a second shell and tube heat exchanger, a second connecting pipe, a constant-temperature heat transfer oil delivery pipe, oil-using equipment, a thermometer, a constant-temperature heat transfer oil return pipe and an automatic temperature control valve;

[0008] The outlet of the buffer tank is connected to the tube-side inlet of the first shell-and-tube heat exchanger via a first connecting pipe, and a circulating pump is provided on the first connecting pipe; the tube-side outlet of the first shell-and-tube heat exchanger is connected to the shell-side inlet of the second shell-and-tube heat exchanger via a second connecting pipe, and the shell-side outlet of the second shell-and-tube heat exchanger is connected to the oil inlet of the oil-consuming equipment via a constant-temperature heat-conducting oil delivery pipe, both of which are provided with thermometers; the oil outlet of the oil-consuming equipment is connected to the inlet of the buffer tank via a constant-temperature heat-conducting oil return pipe;

[0009] The high-temperature heat transfer oil inlet main pipe is connected to a shell-side oil inlet branch pipe and a tube-side oil inlet branch pipe. The shell-side oil inlet branch pipe is connected to the shell-side inlet of the first shell-and-tube heat exchanger, and the tube-side oil inlet branch pipe is connected to the tube-side inlet of the second shell-and-tube heat exchanger. Automatic temperature control valves are respectively provided on the shell-side oil inlet branch pipe and the tube-side oil inlet branch pipe.

[0010] The high-temperature heat transfer oil return main pipe is connected to a shell-side oil return branch pipe and a tube-side oil return branch pipe. The shell-side oil return branch pipe is connected to the shell-side outlet of the first shell and tube heat exchanger, and the tube-side oil return branch pipe is connected to the tube-side outlet of the second shell and tube heat exchanger.

[0011] As common sense, a shell and tube heat exchanger consists of a tube side and a shell side. The tube side is inside the tube, and the shell side is outside the tube (between the tubes and the shell). The tube side and the shell side are respectively provided with an inlet and an outlet.

[0012] The different paths of the present application refer to the different paths of the high and low temperature heat transfer oils in the two-stage shell and tube heat exchangers. The tube side of the first shell and tube heat exchanger is connected in series with the shell side of the second shell and tube heat exchanger. Since the temperature difference between the heat transfer oil in the high temperature heat transfer oil inlet main pipe and the heat transfer oil in the buffer tank is large, during the initial heat exchange, the low temperature heat transfer oil expands greatly due to heat, and the tube side pressure resistance is higher than the shell side. The present application sets the heat transfer oil in the buffer tank to go through the tube side of the first shell and tube heat exchanger first during the initial heat exchange to reduce equipment damage; and for precise temperature control, the heat transfer oil in the buffer tank goes through the shell side of the second shell and tube heat exchanger in the second stage, which can make the low temperature heat transfer oil be heated more evenly.

[0013] The above system displays the temperature through the thermometer on the second connecting pipe and the constant temperature heat transfer oil delivery pipe, and controls the amount of high-temperature heat transfer oil inlet through the automatic temperature control valves on the shell-side oil inlet branch pipe and the tube-side oil inlet branch pipe. When the temperature display is higher than the design value, the high-temperature heat transfer oil inlet flow rate decreases. When the temperature display is lower than the design value, the high-temperature heat transfer oil inlet flow rate increases, thereby achieving precise temperature control.

[0014] The above-mentioned oil-using equipment also requires heating equipment.

[0015] The automatic temperature control valve of this application can be directly purchased from existing equipment. This application does not improve the structure and control method of the automatic temperature control valve itself, so it will not be described in detail.

[0016] In this application, connectivity refers to connection and communication.

[0017] The above-mentioned different-process low-temperature constant-temperature heat transfer oil system also includes a boiler heating system, the high-temperature heat transfer oil inlet main pipe is connected to the oil outlet of the boiler heating system, and the high-temperature heat transfer oil return main pipe is connected to the oil inlet of the boiler heating system; the high-temperature heat transfer oil inlet main pipe, the shell-side oil inlet branch pipe, the shell side of the first shell and tube heat exchanger, the shell-side oil return branch pipe, the high-temperature heat transfer oil return main pipe and the boiler heating system are connected in sequence to form a circulation, and the high-temperature heat transfer oil inlet main pipe, the tube-side oil inlet branch pipe, the tube side of the second shell and tube heat exchanger, the tube-side oil return branch pipe, the high-temperature heat transfer oil return main pipe and the boiler heating system are connected in sequence to form a circulation.

[0018] In order to meet production requirements and reduce costs, the above-mentioned circulation pump is a gear pump.

[0019] As one specific implementation solution, the first shell and tube heat exchanger and the second shell and tube heat exchanger are both shell and tube heat exchangers.

[0020] The first connecting pipe, the second connecting pipe and the constant temperature heat transfer oil delivery pipe are all made of seamless pipes.

[0021] The inlet of the buffer tank is arranged at the top of the side wall of the buffer tank; the outlet of the buffer tank is arranged at the bottom of the buffer tank.

[0022] In order to meet the simultaneous heating needs of multiple sets of equipment, the number of different-flow low-temperature constant-temperature thermal oil assemblies is two or more sets arranged in parallel; the high-temperature thermal oil inlet main pipe is connected to two or more sets of shell-side oil inlet branches and tube-side oil inlet branches, and the high-temperature thermal oil return main pipe is connected to two or more sets of shell-side oil return branches and tube-side oil return branches; the number of shell-side oil inlet branches and tube-side oil inlet branches, the number of shell-side oil return branches and tube-side oil return branches, and the number of different-flow low-temperature constant-temperature thermal oil assemblies are equal and correspond one to one;

[0023] The same set of shell-side oil inlet branch pipes and tube-side oil inlet branch pipes are respectively connected to the shell-side inlet of the first shell-and-tube heat exchanger and the tube-side inlet of the second shell-and-tube heat exchanger on the corresponding different-flow low-temperature constant-temperature heat transfer oil assembly. Each shell-side oil inlet branch pipe and each tube-side oil inlet branch pipe is respectively provided with an automatic temperature control valve;

[0024] The same set of shell-side oil return branch pipes and tube-side oil return branch pipes are respectively connected to the shell-side outlet of the first shell and tube heat exchanger and the tube-side outlet of the second shell and tube heat exchanger on the corresponding different-flow low-temperature constant-temperature heat transfer oil assembly.

[0025] The connection between pipelines in this application refers to being connected and communicating.

[0026] If the oil temperature required by each oil-consuming equipment is slightly different, such as less than 20°C, then each group of different-programmed low-temperature constant-temperature thermal oil components can share the same buffer tank.

[0027] If the oil temperatures required by the oil-using equipment differ greatly, such as greater than 20°C, each group of different-process low-temperature constant-temperature heat transfer oil groups shall use different buffer tanks.

[0028] The technologies not mentioned in this utility model are all referred to the existing technology.

[0029] The utility model discloses a different-flow low-temperature constant-temperature heat transfer oil system, which reduces equipment damage and improves safety and temperature control accuracy by performing different-flow exchanges of heat transfer oil in two-stage shell and tube heat exchangers. At the same time, an automatic temperature control valve is used to control the high-temperature heat transfer oil inlet of the shell and tube heat exchangers connected in series with different flows, so that a low-temperature constant-temperature heat transfer oil with a more accurate temperature is obtained, which further improves the accuracy of temperature control, reduces energy consumption, reduces pipeline corrosion, is safe and environmentally friendly, can be used for low-temperature heating or insulation, and overcomes the problems of high heat loss, high pipeline requirements, and large pipeline damage existing in water vapor insulation technology. Furthermore, it can also meet the simultaneous heating needs of multiple groups of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the utility model's different-process low-temperature constant-temperature thermal oil system Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the structure of the utility model's different-process low-temperature constant-temperature thermal oil system Figure 2 ;

[0032] In the figure, 1 is a buffer tank, 2 is a circulating pump, 3 is a first shell and tube heat exchanger, 4 is a first connecting pipe, 5 is a second shell and tube heat exchanger, 6 is a second connecting pipe, 7 is a constant temperature thermal oil delivery pipe, 8 is an oil-using equipment, 9 is a thermometer, 10 is a constant temperature thermal oil return pipe, 11 is an automatic temperature control valve, 12 is a high-temperature thermal oil inlet main pipe, 13 is a high-temperature thermal oil return main pipe, and 14 is a boiler heating system. DETAILED DESCRIPTION

[0033] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0034] The directional words such as up and down, left and right, horizontal, vertical, top and bottom in this application are all based on the relative directions or positional relationships shown in the drawings or in use, and should not be understood as absolute limitations on this application.

[0035] Example 1

[0036] like Figure 1 As shown, a different-flow low-temperature constant-temperature heat transfer oil system includes a different-flow low-temperature constant-temperature heat transfer oil component, a high-temperature heat transfer oil inlet main pipe and a high-temperature heat transfer oil return main pipe;

[0037] The different-flow low-temperature constant-temperature heat transfer oil assembly includes a buffer tank, a circulation pump, a first shell and tube heat exchanger, a first connecting pipe, a second shell and tube heat exchanger, a second connecting pipe, a constant-temperature heat transfer oil delivery pipe, oil-using equipment, a thermometer, a constant-temperature heat transfer oil return pipe and an automatic temperature control valve;

[0038] The outlet of the buffer tank is connected to the tube-side inlet of the first shell-and-tube heat exchanger via a first connecting pipe, and a circulating pump is provided on the first connecting pipe; the tube-side outlet of the first shell-and-tube heat exchanger is connected to the shell-side inlet of the second shell-and-tube heat exchanger via a second connecting pipe, and the shell-side outlet of the second shell-and-tube heat exchanger is connected to the oil inlet of the oil-consuming equipment via a constant-temperature heat-conducting oil delivery pipe, both of which are provided with thermometers; the oil outlet of the oil-consuming equipment is connected to the inlet of the buffer tank via a constant-temperature heat-conducting oil return pipe;

[0039] The high-temperature heat transfer oil inlet main pipe is connected to a shell-side oil inlet branch pipe and a tube-side oil inlet branch pipe. The shell-side oil inlet branch pipe is connected to the shell-side inlet of the first shell-and-tube heat exchanger, and the tube-side oil inlet branch pipe is connected to the tube-side inlet of the second shell-and-tube heat exchanger. Automatic temperature control valves are respectively provided on the shell-side oil inlet branch pipe and the tube-side oil inlet branch pipe.

[0040] The high-temperature heat transfer oil return main pipe is connected to a shell-side oil return branch pipe and a tube-side oil return branch pipe. The shell-side oil return branch pipe is connected to the shell-side outlet of the first shell and tube heat exchanger, and the tube-side oil return branch pipe is connected to the tube-side outlet of the second shell and tube heat exchanger.

[0041] During use, the heat transfer oil in the buffer tank passes through the first connecting pipe, the tube side of the first shell and tube heat exchanger, the shell side of the second shell and tube heat exchanger, the second connecting pipe and the constant temperature heat transfer oil delivery pipe in sequence, reaches the oil-consuming equipment, and then returns to the buffer tank through the constant temperature heat transfer oil return pipe to form a cycle; the high-temperature heat transfer oil inlet main pipe provides high-temperature heat transfer oil to the shell side of the first shell and tube heat exchanger and the tube side of the second shell and tube heat exchanger respectively. After heat exchange, the high-temperature heat transfer oil passes through the shell side return oil branch pipe and the tube side return oil branch pipe respectively to the high-temperature heat transfer oil return main pipe.

[0042] The above system displays the temperature through the thermometer on the second connecting pipe and the constant temperature heat transfer oil delivery pipe, and controls the amount of high-temperature heat transfer oil inlet through the automatic temperature control valves on the shell-side oil inlet branch pipe and the tube-side oil inlet branch pipe. When the temperature display is higher than the design value, the high-temperature heat transfer oil inlet flow rate decreases. When the temperature display is lower than the design value, the high-temperature heat transfer oil inlet flow rate increases, thereby achieving precise temperature control.

[0043] Example 2

[0044] On the basis of Example 1, the following improvements were further made: the different-flow low-temperature constant-temperature heat transfer oil system also includes a boiler heating system, the high-temperature heat transfer oil inlet main pipe is connected to the oil outlet of the boiler heating system, the high-temperature heat transfer oil return main pipe is connected to the oil inlet of the boiler heating system, the high-temperature heat transfer oil inlet main pipe, the shell-side oil inlet branch pipe, the shell side of the first shell and tube heat exchanger, the shell-side oil return branch pipe, the high-temperature heat transfer oil return main pipe and the boiler heating system are connected in sequence to form a circulation, and the high-temperature heat transfer oil inlet main pipe, the tube-side oil inlet branch pipe, the tube side of the second shell and tube heat exchanger, the tube-side oil return branch pipe, the high-temperature heat transfer oil return main pipe and the boiler heating system are connected in sequence to form a circulation.

[0045] Example 3

[0046] Based on Example 2, the following improvements were made: the circulating pump was a gear pump; the first and second shell-and-tube heat exchangers were both shell-and-tube heat exchangers; and all pipes, including the first and second connecting pipes and the constant-temperature heat transfer oil delivery pipe, were constructed using seamless pipes. The inlet of the buffer tank was located at the top of the buffer tank sidewall; and the outlet of the buffer tank was located at the bottom of the buffer tank.

[0047] Example 4

[0048] On the basis of Example 3, the following improvements were made: Figure 2 As shown, in order to meet the simultaneous heating needs of multiple groups of equipment, the number of different-process low-temperature constant-temperature thermal oil assemblies is three groups arranged in parallel; the high-temperature thermal oil inlet main pipe is connected to more than two groups of shell-side oil inlet branches and tube-side oil inlet branches, and the high-temperature thermal oil return main pipe is connected to more than two groups of shell-side oil return branches and tube-side oil return branches; the number of shell-side oil inlet branches and tube-side oil inlet branches, the number of shell-side oil return branches and tube-side oil return branches, and the number of different-process low-temperature constant-temperature thermal oil assemblies are equal and correspond one to one;

[0049] The same set of shell-side oil inlet branch pipes and tube-side oil inlet branch pipes are respectively connected to the shell-side inlet of the first shell-and-tube heat exchanger and the tube-side inlet of the second shell-and-tube heat exchanger on the corresponding different-flow low-temperature constant-temperature heat transfer oil assembly. Each shell-side oil inlet branch pipe and each tube-side oil inlet branch pipe is respectively provided with an automatic temperature control valve;

[0050] The same set of shell-side oil return branch pipes and tube-side oil return branch pipes are respectively connected to the shell-side outlet of the first shell and tube heat exchanger and the tube-side outlet of the second shell and tube heat exchanger on the corresponding different-flow low-temperature constant-temperature heat transfer oil assembly.

[0051] If the required oil temperatures of the various oil-consuming devices differ by less than 20°C, each set of differential-temperature, constant-temperature thermal oil assemblies can share the same buffer tank. If the required oil temperatures of the various oil-consuming devices differ by more than 20°C, each set of differential-temperature, constant-temperature thermal oil assemblies can use a separate buffer tank. In this example, the required oil temperatures of the various oil-consuming devices differ by more than 20°C.

[0052] The above-mentioned differential low-temperature constant-temperature heat transfer oil systems reduce equipment damage and improve safety and temperature control accuracy by differentially exchanging the heat transfer oil in two-stage shell and tube heat exchangers. At the same time, the automatic temperature control valve controls the high-temperature heat transfer oil inlet of the differentially connected shell and tube heat exchangers in series to obtain low-temperature constant-temperature heat transfer oil with more accurate temperature, further improving the accuracy of temperature control, reducing energy consumption, reducing pipeline corrosion, being safe and environmentally friendly, and can be used for low-temperature heating or insulation, overcoming the problems of high heat loss, high pipeline requirements, and large pipeline damage existing in water vapor insulation technology. Furthermore, it can also meet the simultaneous heating needs of multiple groups of equipment.

Claims

1. A different-process low-temperature constant-temperature thermal oil system, characterized by: It comprises a different-process low-temperature constant-temperature heat transfer oil component, a high-temperature heat transfer oil inlet main pipe (12) and a high-temperature heat transfer oil return main pipe (13); The different-flow low-temperature constant-temperature heat transfer oil assembly comprises a buffer tank (1), a circulation pump (2), a first shell-and-tube heat exchanger (3), a first connecting pipe (4), a second shell-and-tube heat exchanger (5), a second connecting pipe (6), a constant-temperature heat transfer oil delivery pipe (7), an oil-using device (8), a thermometer (9), a constant-temperature heat transfer oil return pipe (10), and an automatic temperature control valve (11); The outlet of the buffer tank (1) is connected to the tube-side inlet of the first shell-and-tube heat exchanger (3) through a first connecting pipe (4), and the circulating pump (2) is arranged on the first connecting pipe (4); the tube-side outlet of the first shell-and-tube heat exchanger (3) is connected to the shell-side inlet of the second shell-and-tube heat exchanger (5) through a second connecting pipe (6), and the shell-side outlet of the second shell-and-tube heat exchanger (5) is connected to the oil inlet of the oil-using equipment (8) through a constant-temperature heat-conducting oil delivery pipe (7), and thermometers (9) are provided on both the second connecting pipe (6) and the constant-temperature heat-conducting oil delivery pipe (7); the oil outlet of the oil-using equipment (8) is connected to the inlet of the buffer tank (1) through a constant-temperature heat-conducting oil return pipe (10); The high-temperature heat transfer oil inlet main pipe (12) is connected to a shell-side oil inlet branch pipe and a tube-side oil inlet branch pipe. The shell-side oil inlet branch pipe is connected to the shell-side inlet of the first shell-and-tube heat exchanger (3), and the tube-side oil inlet branch pipe is connected to the tube-side inlet of the second shell-and-tube heat exchanger (5). Automatic temperature control valves (11) are respectively provided on the shell-side oil inlet branch pipe and the tube-side oil inlet branch pipe. The high-temperature heat transfer oil return main pipe (13) is connected to a shell-side oil return branch pipe and a tube-side oil return branch pipe. The shell-side oil return branch pipe is connected to the shell-side outlet of the first shell-and-tube heat exchanger (3), and the tube-side oil return branch pipe is connected to the tube-side outlet of the second shell-and-tube heat exchanger (5).

2. The different-stage low-temperature constant-temperature heat transfer oil system according to claim 1, characterized in that: The invention also includes a boiler heating system (14), a high-temperature heat-conducting oil inlet main pipe (12) connected to the oil outlet of the boiler heating system (14), and a high-temperature heat-conducting oil return main pipe (13) connected to the oil inlet of the boiler heating system (14); the high-temperature heat-conducting oil inlet main pipe (12), the shell-side oil inlet branch pipe, the shell side of the first shell-and-tube heat exchanger (3), the shell-side oil return branch pipe, the high-temperature heat-conducting oil return main pipe (13) and the boiler heating system (14) are connected in sequence to form a circulation; the high-temperature heat-conducting oil inlet main pipe (12), the tube-side oil inlet branch pipe, the tube side of the second shell-and-tube heat exchanger (5), the tube-side oil return branch pipe, the high-temperature heat-conducting oil return main pipe (13) and the boiler heating system (14) are connected in sequence to form a circulation.

3. The different-stage low-temperature constant-temperature heat transfer oil system according to claim 1 or 2, characterized in that: The circulation pump (2) is a gear pump.

4. The different-stage low-temperature constant-temperature heat transfer oil system according to claim 1 or 2, characterized in that: The first shell and tube heat exchanger (3) and the second shell and tube heat exchanger (5) are both shell and tube heat exchangers.

5. The different-stage low-temperature constant-temperature heat transfer oil system according to claim 1 or 2, characterized in that: The first connecting pipe (4), the second connecting pipe (6) and the constant temperature heat transfer oil delivery pipe (7) are all made of seamless pipes.

6. The different-stage low-temperature constant-temperature heat transfer oil system according to claim 1 or 2, characterized in that: The inlet of the buffer tank (1) is arranged at the top of the side wall of the buffer tank (1); and the outlet of the buffer tank (1) is arranged at the bottom of the buffer tank (1).

7. The different-stage low-temperature constant-temperature heat transfer oil system according to claim 1 or 2, characterized in that: The number of the different-flow type low-temperature constant-temperature heat transfer oil components is two or more groups arranged in parallel; the high-temperature heat transfer oil inlet main pipe (12) is connected with two or more groups of shell-side oil inlet branches and tube-side oil inlet branches, and the high-temperature heat transfer oil return main pipe (13) is connected with two or more groups of shell-side oil return branches and tube-side oil return branches; the number of the shell-side oil inlet branches and tube-side oil inlet branches, the number of the shell-side oil return branches and tube-side oil return branches, and the number of the different-flow type low-temperature constant-temperature heat transfer oil components are equal and correspond one to one; The same group of shell-side oil inlet branch pipes and tube-side oil inlet branch pipes are respectively connected to the shell-side inlet of the first shell-and-tube heat exchanger (3) and the tube-side inlet of the second shell-and-tube heat exchanger (5) on the corresponding different-flow low-temperature constant-temperature heat transfer oil assembly, and each shell-side oil inlet branch pipe and each tube-side oil inlet branch pipe are respectively provided with an automatic temperature control valve (11); The same group of shell-side oil return branch pipes and tube-side oil return branch pipes are respectively connected to the shell-side outlet of the first shell-and-tube heat exchanger (3) and the tube-side outlet of the second shell-and-tube heat exchanger (5) on the corresponding different-process low-temperature constant-temperature heat transfer oil assembly.

8. The different-stage low-temperature constant-temperature heat transfer oil system according to claim 7, characterized in that: Each group of different-program low-temperature constant-temperature heat transfer oil components shares a common buffer tank (1).

9. The different-stage low-temperature constant-temperature heat transfer oil system according to claim 7, characterized in that: Each group of different-process low-temperature constant-temperature heat transfer oil groups uses a different buffer tank (1).

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