A rectifying column coupled with a heat pump of mixed working medium of regenerative type

Abstract

The application provides a distillation column coupled with a regenerative mixed working medium heat pump, which comprises a compressor (101), a post-cooler (102), a regenerative heat exchanger (103), a throttling element (104), a cold-end heat exchanger (105), a column body (106) and a reflux distributor (107). The distillation column coupled with the regenerative mixed working medium heat pump can simultaneously provide cold energy for a column top and heat energy for a column bottom by using the regenerative mixed working medium heat pump, can adapt to a large temperature difference between the column top and the column bottom, does not need to additionally input cold energy and heat energy from the outside world, and can greatly reduce the energy consumption of a distillation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical distillation separation, and in particular to a distillation column coupled with a backheating mixed-refrigerant heat pump. BACKGROUND

[0002] Distillation is an important method for separating light components and heavy components in a mixture. When a distillation column is in operation, it generally needs to supply cold energy at the top condenser and supply heat at the bottom reboiler, which are used for condensation of light components and reboiling of heavy components, respectively. Vapor compression refrigeration units and heat pumps are one of the main choices for cold sources and heat sources. However, for a distillation column with a large temperature difference between the top and the bottom, a conventional mechanical refrigeration unit can only supply cold energy, and the heat quantity of the condenser thereof is too low to be directly used for reboiling at the bottom. A conventional vapor compression heat pump unit can only supply heat, and the cold end thereof is also difficult to be directly used for condensation at the top. In summary, the use of conventional vapor compression refrigeration or heat pump units for a distillation column has the problems of low comprehensive energy utilization efficiency and high energy consumption.

[0003] A mixed-refrigerant backheating cycle can operate refrigeration / heat pumping in a large temperature span, and the refrigeration / heat pumping temperature span thereof can exceed 100℃. The mixed-refrigerant backheating cycle can meet the refrigeration / heat pumping requirements by optimizing the refrigerant ratio, and has the advantages of simple system structure, high efficiency, strong flexibility, and being particularly suitable for distributed cold / heat load. Coupling a distillation column with a mixed-refrigerant backheating heat pump cycle can achieve efficient supply of cold energy and heat energy for a large-temperature-span distillation process. SUMMARY

[0004] In view of this, it is necessary to provide a distillation column coupled with a backheating mixed-refrigerant heat pump, which can adapt to a large temperature difference between the top and the bottom of a distillation column, has a simple and reliable structure, and has low overall energy consumption.

[0005] To solve the above problems, the present application adopts the following technical solutions:

[0006] The present application provides a distillation column coupled with a backheating mixed-refrigerant heat pump, which comprises a compressor (101), an aftercooler (102), a backheating heat exchanger (103), a throttling element (104), a cold-end heat exchanger (105), a column body (106), and a reflux distributor (107). Wherein:

[0007] The high-pressure mixed working fluid formed after the mixed working fluid is pressurized by the compressor (101) enters the after-cooler (102), and the heat released by the high-pressure mixed working fluid during the cooling process in the after-cooler (102) is used for the reboiling process. Then, the high-pressure mixed working fluid enters the regenerative heat exchanger (103) through the outlet of the after-cooler (102), and after being cooled by the low-pressure mixed working fluid in the regenerative heat exchanger (103), the high-pressure mixed working fluid is cooled and depressurized by the throttling element (104) to form a low-pressure mixed working fluid. The low-pressure mixed working fluid enters the cold-end heat exchanger (105) to provide cold energy for the overhead condensation, and then enters the regenerative heat exchanger (103) through the outlet of the cold-end heat exchanger (105) and releases cold energy through the regenerative heat exchanger (103) before returning to the compressor (101) to complete the cycle.

[0008] The material to be separated enters the middle of the column body (106) from the feed port, and the gas-phase material is heated and mass transferred with the reflux liquid in the rectification section of the column body (106) from the feed port upward. Then, the gas-phase light component is condensed by the cold energy provided by the low-pressure mixed working fluid in the cold-end heat exchanger (105) at the top of the column body (106), and the liquid-phase light component is divided into two streams by the reflux distributor (107), one of which is taken out as a product, and the other is returned to the column body (106) to form a reflux liquid to participate in rectification. The liquid-phase material is heated and mass transferred with the gas phase returned to the column body (106) from the after-cooler (102) in the stripping section of the column body (106) downward. Then, the liquid-phase material enters the after-cooler (102) to be heated and boiled by the high-pressure mixed working fluid, and the generated gas-phase heavy component is returned to the column body (106), and part of the liquid-phase heavy component is taken out as a product.

[0009] In some embodiments, the mixed working fluid is a multi-component mixture, and the components include but are not limited to several of the following substances: nitrogen, methane, carbon tetrafluoride, ethylene, ethane, propylene, propane, isobutane, n-butane, isopentane, n-pentane, n-hexane, R23, R41, R116, R32, R125, R143a, R22, R218, R1234yf, R1234ze(E), R1234ze(Z), R134a, R152a, R227ea, R236fa, R236ea, R245fa, R245ca, R356mfc, R4310mee.

[0010] In some embodiments, the cold-end heat exchanger (105) is further connected with an additional cold source (108), and the after-cooler (102) is connected with an additional heat source (109).

[0011] In some embodiments, the high-pressure mixed working fluid at the outlet of the aftercooler (102) is divided into two streams. One stream of the high-pressure mixed working fluid directly enters the high-pressure mixed working fluid heat exchange tube (110) in the stripping section of the tower body (106) to release heat and is also cooled by the material to be separated. The other stream of the high-pressure mixed working fluid enters the regenerating heat exchanger (103) and is cooled by the low-pressure mixed working fluid. Then the two streams of high-pressure mixed working fluid merge and are throttled to form a low-pressure mixed working fluid.

[0012] In some embodiments, the low-pressure mixed working fluid at the outlet of the cold-end heat exchanger (105) is divided into two streams. One stream of the low-pressure mixed working fluid directly enters the low-pressure mixed working fluid heat exchange tube (111) in the rectification section of the column body (106) to release cold energy and is also heated by the material to be separated. The other stream of the low-pressure mixed working fluid enters the regenerating heat exchanger (103) to release cold energy for cooling the high-pressure mixed working fluid. Then the two streams of low-pressure mixed working fluid merge and return to the compressor (101).

[0013] In some embodiments, the regenerative heat exchanger (103) is embedded in the tower body (106) and can directly exchange heat with the aforementioned materials.

[0014] In some embodiments, the regenerative heat exchanger (103) is a counter-current indirect heat exchanger, in which the high-pressure mixed working fluid and the low-pressure mixed working fluid directly undergo indirect heat exchange.

[0015] In addition, this application also provides a distillation column with a coupled regenerative mixed working fluid heat pump, comprising: a compressor (101), an aftercooler (102), a throttling element (104), a cold-end heat exchanger (105), a column body (106), a reflux distributor (107), a high-pressure mixed working fluid heat exchange tube (110), and a low-pressure mixed working fluid heat exchange tube (111), wherein the high-pressure mixed working fluid heat exchange tube (110) and the low-pressure mixed working fluid heat exchange tube (111) are disposed in the column body (106), wherein:

[0016] The high-pressure mixed working fluid formed by the compressor (101) enters the aftercooler (102). The heat released by the high-pressure mixed working fluid during the cooling process in the aftercooler (102) is used for the reboiling process. Then, it enters the high-pressure mixed working fluid heat exchange tube (110) through the outlet of the aftercooler (102). After being cooled by the low-pressure mixed working fluid in the high-pressure mixed working fluid heat exchange tube (110), the high-pressure mixed working fluid is cooled and depressurized by the throttling element (104) to form a low-pressure mixed working fluid. The low-pressure mixed working fluid enters the cold end heat exchanger (105) to provide cooling for the top condensation of the tower. Then, it enters the low-pressure mixed working fluid heat exchange tube (111) through the outlet of the cold end heat exchanger (105), and after releasing the cooling through the low-pressure mixed working fluid heat exchange tube (111), it returns to the compressor (101) to complete the cycle.

[0017] The material to be separated enters the middle of the column (106) through the feed inlet. The gaseous material flows upward through the rectification section of the column (106) and undergoes heat and mass transfer with the reflux liquid. Then, it is condensed by the cold-end heat exchanger (105) at the top of the column (106) by the cooling capacity provided by the low-pressure mixed working fluid. The gaseous light component is collected as the product, while the liquid light component is divided into two streams by the reflux distributor (107), one stream being collected as the product and the other being returned to the reflux distributor. After flowing to the column body (106), it forms a reflux liquid to participate in the distillation; the liquid material flows downward from the feed port through the stripping section of the column body (106) and undergoes heat and mass transfer with the gas phase returning from the aftercooler (102) to the column body (106). Then the liquid material enters the aftercooler (102) and is heated and boiled by the high-pressure mixed working fluid. The generated gas phase heavy components are returned to the column body (106), and some of the liquid phase heavy components are collected as products.

[0018] The present application adopts the above technical solution, and its beneficial effects are as follows:

[0019] The distillation column with coupled regenerative mixed working fluid heat pump provided in this application uses a regenerative mixed working fluid heat pump to simultaneously provide cooling at the top of the distillation column and heating at the bottom of the column. It can adapt to a large temperature difference between the top and bottom of the distillation column, and does not require additional external input of cooling and heating, which can significantly reduce the energy consumption of the distillation process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a schematic diagram of the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 1 of this application.

[0022] Figure 2 This is a schematic diagram of the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 2 of this application.

[0023] Figure 3 This is a schematic diagram of the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 3 of this application.

[0024] Figure 4 This is a schematic diagram of the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 4 of this application.

[0025] Figure 5 This is a schematic diagram of the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 5 of this application.

[0026] Figure 6 This is a schematic diagram of the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 6 of the present invention. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0028] In the description of this application, it should be understood that the terms "upper", "lower", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.

[0031] Example 1

[0032] Please see Figure 1 The diagram below shows the structure of a distillation column for a coupled regenerative mixed working fluid heat pump provided in this embodiment, including: a compressor (101), an aftercooler (102), a regenerative heat exchanger (103), a throttling element (104), a cold end heat exchanger (105), a column body (106), and a reflux distributor (107).

[0033] In this embodiment, the aftercooler (102) functions as the reboiler of the distillation column, the cold end heat exchanger (105) functions as the top condenser of the distillation column, and the column body (106) can adopt a plate column structure or a packed column structure; the material to be separated enters the column body (106) through the feed inlet, the section above the feed inlet is the rectification section of the column body (106), and the section below the feed inlet is the stripping section of the column body (106).

[0034] In this embodiment, the compressor (101), aftercooler (102), regenerative heat exchanger (103), throttling element (104), and cold end heat exchanger (105) constitute a mixed working fluid regenerative heat pump cycle; the tower body (106), aftercooler (102), cold end heat exchanger (105), and reflux distributor 107 constitute a distillation tower.

[0035] The operation mode of the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 1 of the present invention is as follows:

[0036] The high-pressure mixed working fluid formed by the compressor (101) enters the aftercooler (102). The heat released by the high-pressure mixed working fluid during the cooling process in the aftercooler (102) is used for the reboiling process. Then, it enters the regenerating heat exchanger (103) through the outlet of the aftercooler (102). After being cooled by the low-pressure mixed working fluid in the regenerating heat exchanger (103), the high-pressure mixed working fluid is cooled and depressurized by the throttling element (104) to form a low-pressure mixed working fluid. The low-pressure mixed working fluid enters the cold end heat exchanger (105) to provide cooling for the top condensation of the tower. Then, it enters the regenerating heat exchanger (103) through the outlet of the cold end heat exchanger (105), and after releasing the cooling capacity through the regenerating heat exchanger (103), it returns to the compressor (101) to complete the cycle.

[0037] The material to be separated enters the middle of the column (106) through the feed inlet. The gaseous material flows upward through the rectification section of the column (106) and undergoes heat and mass transfer with the reflux liquid. Then, it is condensed by the cold-end heat exchanger (105) at the top of the column (106) by the cooling capacity provided by the low-pressure mixed working fluid. The gaseous light component is collected as the product, while the liquid light component is divided into two streams by the reflux distributor (107), one stream being collected as the product and the other being returned to the reflux distributor. After flowing to the column body (106), it forms a reflux liquid to participate in the distillation; the liquid material flows downward from the feed port through the stripping section of the column body (106) and undergoes heat and mass transfer with the gas phase returning from the aftercooler (102) to the column body (106). Then the liquid material enters the aftercooler (102) and is heated and boiled by the high-pressure mixed working fluid. The generated gas phase heavy components are returned to the column body (106), and some of the liquid phase heavy components are collected as products.

[0038] In this embodiment, the mixed working fluid is a multi-component mixture, whose components include, but are not limited to, several of the following substances: nitrogen, methane, carbon tetrafluoride, ethylene, ethane, propylene, propane, isobutane, n-butane, isopentane, n-pentane, n-hexane, R23, R41, R116, R32, R125, R143a, R22, R218, R1234yf, R1234ze(E), R1234ze(Z), R134a, R152a, R227ea, R236fa, R236ea, R245fa, R245ca, R356mfc, and R4310mee.

[0039] The distillation column with coupled regenerative mixed working fluid heat pump provided in Embodiment 1 of the present invention uses a regenerative mixed working fluid heat pump to simultaneously provide cooling at the top of the distillation column and heating at the bottom of the column. It can adapt to a large temperature difference between the top and bottom of the distillation column, and does not require additional external input of cooling and heating, which can significantly reduce the energy consumption of the distillation process.

[0040] Example 2

[0041] Please see Figure 2 The diagram below is a structural schematic of a distillation column for a coupled regenerative mixed working fluid heat pump provided in Embodiment 2. For ease of explanation, only the relevant figures are described below.

[0042] The difference from Embodiment 1 above is that the cold end heat exchanger (105) is also connected to an additional cold source (108), and the aftercooler (102) is connected to an additional heat source (109) to assist in regulating the distillation process and improve the accuracy of process parameter control.

[0043] Other structures and their implementation methods can be found in Example 1, and will not be described in detail here.

[0044] The distillation column with coupled regenerative mixed working fluid heat pump provided in Embodiment 2 of the present invention uses a regenerative mixed working fluid heat pump to simultaneously provide cooling at the top of the distillation column and heating at the bottom of the column. It can adapt to a large temperature difference between the top and bottom of the distillation column, and does not require additional external input of cooling and heating, which can significantly reduce the energy consumption of the distillation process.

[0045] Example 3

[0046] Please see Figure 3 The diagram below is a structural schematic of a distillation column for a coupled regenerative mixed working fluid heat pump provided in Embodiment 3. For ease of explanation, only the relevant figures are described below.

[0047] The difference from Embodiment 1 above is that in the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 3, the high-pressure mixed working fluid at the outlet of the aftercooler (102) is divided into two streams. One stream of the high-pressure mixed working fluid directly enters the high-pressure mixed working fluid heat exchange tube (110) in the stripping section of the column body (106) to release heat and is also cooled by the material to be separated. The other stream of the high-pressure mixed working fluid enters the regenerative heat exchanger (103) and is cooled by the low-pressure mixed working fluid. Then the two streams of high-pressure mixed working fluid merge and are throttled to form a low-pressure mixed working fluid.

[0048] Other structures and their implementation methods can be found in Example 1, and will not be described in detail here.

[0049] The distillation column with coupled regenerative mixed working fluid heat pump provided in Embodiment 3 of the present invention uses a regenerative mixed working fluid heat pump to simultaneously provide cooling at the top of the distillation column and heating at the bottom of the column. It can adapt to a large temperature difference between the top and bottom of the distillation column, and does not require additional external input of cooling and heating, which can significantly reduce the energy consumption of the distillation process.

[0050] Example 4

[0051] Please see Figure 4 The diagram below is a schematic diagram of the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 1 of the present invention. For ease of explanation, only the relevant drawings are described below.

[0052] The difference from Embodiment 1 above is that in this embodiment, the low-pressure mixed working fluid at the outlet of the cold end heat exchanger (105) is divided into two streams. One stream of the low-pressure mixed working fluid directly enters the low-pressure mixed working fluid heat exchange tube (111) in the rectification section of the tower body (106) to release cold energy and is also heated by the material to be separated. The other stream of the low-pressure mixed working fluid enters the regenerating heat exchanger (103) to release cold energy for cooling the high-pressure mixed working fluid. Then the two streams of low-pressure mixed working fluid merge and return to the compressor (101).

[0053] Other structures and their implementation methods can be found in Example 1, and will not be described in detail here.

[0054] The distillation column with coupled regenerative mixed working fluid heat pump provided in Embodiment 4 of the present invention uses a regenerative mixed working fluid heat pump to simultaneously provide cooling at the top of the distillation column and heating at the bottom of the column. It can adapt to a large temperature difference between the top and bottom of the distillation column, and does not require additional external input of cooling and heating, which can significantly reduce the energy consumption of the distillation process.

[0055] Example 5

[0056] Please see Figure 5 The diagram below shows the structure of the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 5 of the present invention. For ease of explanation, only the relevant drawings are described below.

[0057] In this embodiment, the regenerative heat exchanger (103) is embedded in the tower body (106) and can directly exchange heat with the aforementioned materials.

[0058] Furthermore, the regenerative heat exchanger (103) is a counter-current indirect heat exchanger, in which the high-pressure mixed working fluid and the low-pressure mixed working fluid directly undergo indirect heat exchange.

[0059] Other working methods can be referred to in Example 1, and will not be repeated here.

[0060] The distillation column with coupled regenerative mixed working fluid heat pump provided in Embodiment 5 of the present invention uses a regenerative mixed working fluid heat pump to simultaneously provide cooling at the top of the distillation column and heating at the bottom of the column. It can adapt to a large temperature difference between the top and bottom of the distillation column, and does not require additional external input of cooling and heating, which can significantly reduce the energy consumption of the distillation process.

[0061] Example 6

[0062] Please see Figure 6 The diagram below shows the structure of the distillation column of the coupled regenerative mixed working fluid heat pump provided in Embodiment 6 of the present invention. For ease of explanation, only the relevant drawings are described below.

[0063] In this embodiment, the distillation column of the coupled regenerative mixed working fluid heat pump includes a compressor (101), an aftercooler (102), a throttling element (104), a cold-end heat exchanger (105), a column body (106), a reflux distributor (107), a high-pressure mixed working fluid heat exchange tube (110), and a low-pressure mixed working fluid heat exchange tube (111). The high-pressure mixed working fluid heat exchange tube (110) and the low-pressure mixed working fluid heat exchange tube (111) are disposed in the column body (106), wherein:

[0064] The high-pressure mixed working fluid formed by the compressor (101) enters the aftercooler (102). The heat released by the high-pressure mixed working fluid during the cooling process in the aftercooler (102) is used for the reboiling process. Then, it enters the high-pressure mixed working fluid heat exchange tube (110) through the outlet of the aftercooler (102). After being cooled by the low-pressure mixed working fluid in the high-pressure mixed working fluid heat exchange tube (110), the high-pressure mixed working fluid is cooled and depressurized by the throttling element (104) to form a low-pressure mixed working fluid. The low-pressure mixed working fluid enters the cold end heat exchanger (105) to provide cooling for the top condensation of the tower. Then, it enters the low-pressure mixed working fluid heat exchange tube (111) through the outlet of the cold end heat exchanger (105), and after releasing the cooling through the low-pressure mixed working fluid heat exchange tube (111), it returns to the compressor (101) to complete the cycle.

[0065] The material to be separated enters the middle of the column (106) through the feed inlet. The gaseous material flows upward through the rectification section of the column (106) and undergoes heat and mass transfer with the reflux liquid. Then, it is condensed by the cold-end heat exchanger (105) at the top of the column (106) by the cooling capacity provided by the low-pressure mixed working fluid. The gaseous light component is collected as the product, while the liquid light component is divided into two streams by the reflux distributor (107), one stream being collected as the product and the other being returned to the reflux distributor. After flowing to the column body (106), it forms a reflux liquid to participate in the distillation; the liquid material flows downward from the feed port through the stripping section of the column body (106) and undergoes heat and mass transfer with the gas phase returning from the aftercooler (102) to the column body (106). Then the liquid material enters the aftercooler (102) and is heated and boiled by the high-pressure mixed working fluid. The generated gas phase heavy components are returned to the column body (106), and some of the liquid phase heavy components are collected as products.

[0066] The distillation column with coupled regenerative mixed working fluid heat pump provided in Embodiment 6 of the present invention uses a regenerative mixed working fluid heat pump to simultaneously provide cooling at the top of the distillation column and heating at the bottom of the column. It can adapt to a large temperature difference between the top and bottom of the distillation column, and does not require additional external input of cooling and heating, which can significantly reduce the energy consumption of the distillation process.

[0067] It is understood that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above are merely preferred embodiments of this application, and only specifically describe the technical principles of this application. These descriptions are only for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, as well as other specific embodiments of this application that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of this application.

Claims

1. A distillation column coupled with a regenerative mixed working fluid heat pump, characterized in that, include: The compressor (101), aftercooler (102), throttling element (104), cold-end heat exchanger (105), tower body (106), reflux distributor (107), high-pressure mixed working fluid heat exchange tube (110) and low-pressure mixed working fluid heat exchange tube (111), wherein the high-pressure mixed working fluid heat exchange tube (110) and the low-pressure mixed working fluid heat exchange tube (111) are disposed in the tower body (106), wherein: The high-pressure mixed working fluid formed by the compressor (101) enters the aftercooler (102). The heat released by the high-pressure mixed working fluid during the cooling process in the aftercooler (102) is used for the reboiling process. Then, it enters the high-pressure mixed working fluid heat exchange tube (110) through the outlet of the aftercooler (102). After being cooled by the low-pressure mixed working fluid in the high-pressure mixed working fluid heat exchange tube (110), the high-pressure mixed working fluid is cooled and depressurized by the throttling element (104) to form a low-pressure mixed working fluid. The low-pressure mixed working fluid enters the cold end heat exchanger (105) to provide cooling for the top condensation of the tower. Then, it enters the low-pressure mixed working fluid heat exchange tube (111) through the outlet of the cold end heat exchanger (105), and after releasing the cooling through the low-pressure mixed working fluid heat exchange tube (111), it returns to the compressor (101) to complete the cycle. The material to be separated enters the middle of the column (106) through the feed inlet. The gaseous material flows upward from the feed inlet through the rectification section of the column (106) and undergoes heat and mass transfer with the reflux liquid. Then, it is condensed by the cold-end heat exchanger (105) at the top of the column (106) by the cooling capacity provided by the low-pressure mixed working fluid. The gaseous light component is collected as the product, while the liquid light component is divided into two streams by the reflux distributor (107), one of which is collected as the product and the other... After being refluxed back to the column body (106), the reflux liquid participates in the distillation. The liquid material flows downward from the feed port through the stripping section of the column body (106) and undergoes heat and mass transfer with the gas phase returning from the aftercooler (102) to the column body (106). Then, the liquid material enters the aftercooler (102) and is heated and boiled by the high-pressure mixed working fluid. The resulting gas phase heavy components are returned to the column body (106), while some of the liquid phase heavy components are collected as products.

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