Combined condenser evaporator

Abstract

This invention discloses a combined condenser-evaporator, comprising a condensation channel through which gas flows and condenses; a first evaporation channel through which a first liquid flows and indirectly exchanges heat with the gas, resulting in at least partial evaporation; and a second evaporation channel through which a second liquid flows and indirectly exchanges heat with the gas, resulting in at least partial evaporation. The combined condenser-evaporator includes a heat exchanger core immersed in a substrate liquid. The heat exchanger core is formed by stacking condensation channels, a first evaporation channel, and a second evaporation channel arranged at intervals; it also includes a partition plate dividing the heat exchanger core into a closed section and a semi-open section. The closed section includes the condensation channel and the first evaporation channel, both of which are not in communication with the substrate liquid. The semi-open section includes the condensation channel and the second evaporation channel, wherein the condensation channel is not in communication with the substrate liquid, while the second evaporation channel is in communication with the substrate liquid, and the substrate liquid circulates and evaporates in the second evaporation channel; wherein the first liquid and the second liquid are different.

Description

Technical Field

[0001] This invention relates to a condenser-evaporator, and more particularly to a combined condenser-evaporator that simultaneously evaporates multiple liquids by indirect heat exchange with the same condensed gas. Background Technology

[0002] Condensing evaporators, as a type of heat exchange equipment, are widely used in various processes. For example, in cryogenic distillation and air separation, condensing evaporators are used to generate reflux liquid and / or rising gas from the distillation column, and to obtain the corresponding gaseous products. Condensing evaporators include different types such as immersion evaporators and falling film evaporators, and the specific designs of their heat exchange components include plate-fin type, shell-and-tube type, and plate-and-tube type, etc.

[0003] Because the condenser-evaporator is a key component of the distillation column system, occupying a large space, having a high manufacturing cost, and having a significant impact on energy consumption, relevant technical personnel in the industry have been continuously researching and optimizing it for many years.

[0004] CN106662395B discloses a multi-stage liquid-storage condenser-evaporator with a heat exchanger core consisting of a heat exchange section and a liquid communication section. The heat exchange section is formed by adjacent laminated condensation channels and evaporation channels constructed of plates and fins. The condensation channels are vertically connected, but the evaporation channels are divided into multiple segments, each corresponding to a liquid communication section containing both a liquid storage section and a liquid communication channel. This design reduces the liquid head of liquefied oxygen in each evaporation channel segment, resulting in higher heat exchange efficiency; furthermore, the integral manufacturing of the heat exchanger core also reduces costs. However, this condenser-evaporator only allows indirect heat exchange between two fluids.

[0005] US11,933,540B2 discloses an integrated condenser-evaporator. This condenser-evaporator is a "single-pass" heat exchange device placed within a gas-liquid separator, comprising one set of condensation channels and two sets of evaporation channels. The condenser-evaporator is divided into a top zone, a middle zone, and a bottom zone. The gas to be condensed enters from the top zone and exits from the bottom zone after condensation. A first condensing medium enters from the bottom zone, partially evaporates, and flows from the top zone into the gas-liquid separator, where it is separated into liquid and gas phases. The liquid phase, acting as a second condensing medium, enters the condenser-evaporator from the middle zone, partially evaporates, exits from the top, and is then returned to the distillation column system. In this configuration, both the first and second condensing media flow from bottom to top in a "single-pass" manner within the evaporation channels, potentially causing flammable impurities to deposit and create a safety hazard.

[0006] In view of this, how to design a combined condenser-evaporator that allows one gas to exchange heat with multiple liquids simultaneously, thereby making the equipment more compact, lower in manufacturing cost, and higher in safety, is a problem that relevant technical personnel in the industry urgently need to solve. Summary of the Invention

[0007] The purpose of this invention is to provide a combined condenser-evaporator with a simple structure and easy manufacturing, which enables a gas to exchange heat with multiple liquids simultaneously and indirectly while ensuring safety and heat exchange performance.

[0008] In one aspect, the present invention provides a combined condenser-evaporator, comprising a condensation channel through which gas flows and condenses; a first evaporation channel through which a first liquid flows and indirectly exchanges heat with the gas, at least partially evaporating; and a second evaporation channel through which a second liquid flows and indirectly exchanges heat with the gas, at least partially evaporating. It also includes a heat exchanger core immersed in a vessel liquid. The heat exchanger core is formed by stacking spaced-apart condensation channels, a first evaporation channel, and a second evaporation channel. It further includes a partition plate dividing the heat exchanger core into a closed section and a semi-open section. The closed section includes spaced-apart condensation channels and a first evaporation channel, both of which are not in communication with the vessel liquid. The semi-open section includes spaced-apart condensation channels and a second evaporation channel, wherein the condensation channels are not in communication with the vessel liquid, but the second evaporation channel is in communication with the vessel liquid, and the vessel liquid circulates and evaporates in the second evaporation channel; wherein the first liquid and the second liquid are different, and the oxygen content of the second liquid is greater than that of the first liquid.

[0009] Furthermore, the flow direction of gas in the condensation channel and the flow direction of liquid in the first and second evaporation channels are all approximately perpendicular to the horizontal plane.

[0010] Furthermore, the stacking direction of the condensation channel, the first evaporation channel, and the second evaporation channel is approximately orthogonal to the condensation surface, the first evaporation surface, and the second evaporation surface. In addition, the partition plate is approximately parallel to the condensation surface.

[0011] On the other hand, the condensation channel, the first evaporation channel, and the second evaporation channel all include plate-fin structures.

[0012] Furthermore, the upper side of the heat exchanger core has a gas distribution section, and the lower side of the heat exchanger core has a liquid outlet section after condensation.

[0013] In addition, the top of the heat exchanger core sealing part has a first liquid distribution part and a first liquid inlet, and the bottom of the heat exchanger core sealing part has a first gas-liquid mixture outlet and a first gas-liquid mixture outlet, with the gas and the first liquid flowing in the same direction.

[0014] Alternatively, the bottom of the heat exchanger core enclosure has a first liquid distribution section and a first liquid inlet, and the top of the heat exchanger core enclosure has a first gas-liquid mixture outlet section and a first gas-liquid mixture outlet section, with the gas and the first liquid flowing in opposite directions.

[0015] In another aspect, the present invention provides a distillation column system comprising the combined condenser-evaporator described above, and further comprising an optional first gas-liquid separator, a second gas-liquid separator, and a second pressure reducing device. The first liquid inlet of the heat exchanger core enclosure is connected to the first liquid outlet of the first gas-liquid separator, and the first gas-liquid mixed flow outlet of the heat exchanger core enclosure is connected to the middle portion of the second gas-liquid separator. The liquid phase outlet of the second gas-liquid separator is connected to the middle portion of the combined condenser-evaporator after passing through the second pressure reducing device.

[0016] Furthermore, it also includes a first pressure-reducing device. The oxygen-enriched liquid air generated by the distillation column system is reduced in pressure by the first pressure-reducing device and then enters the first gas-liquid separator.

[0017] Furthermore, the gaseous products generated by the first and second gas-liquid separators are mixed and returned to the distillation column system.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0019] 1. Simple structure, easy to manufacture;

[0020] 2. It integrates the gas distribution section and the condensed liquid outlet section in both closed and semi-open sections, producing a synergistic effect;

[0021] 3. The semi-open section submerged in the liquid in the vessel is equivalent to a immersion heat exchanger. It is used to evaporate a second liquid with a higher oxygen content, thus improving the safety factor. Attached Figure Description

[0022] The advantages and spirit of the present invention can be further understood through the following detailed description and accompanying drawings. Those skilled in the art will understand that the drawings and embodiments do not constitute any limitation on the present invention. The same reference numerals in the drawings correspond to the same or equivalent components.

[0023] Figure 1 This is a three-dimensional appearance view of the combined condenser-evaporator heat exchange core of Example 1;

[0024] Figure 2 This is a side cross-sectional view taken along the stacking direction of the heat exchange core plates of the combined condenser-evaporator in Example 1.

[0025] Figure 3 This is a top view of the combined condenser-evaporator heat exchange core in Example 1;

[0026] Figure 4 This is a cross-sectional view taken along the condensation surface of the condensation channel in the semi-open part of the heat exchange core of the combined condenser-evaporator in Example 1.

[0027] Figure 5This is a cross-sectional view of the first evaporation surface along the first evaporation channel in the closed part of the heat exchange core of the combined condenser-evaporator in Example 1.

[0028] Figure 6 This is a cross-sectional view of the second evaporation surface along the second evaporation channel in the semi-open part of the heat exchange core of the combined condenser-evaporator in Example 1.

[0029] Figure 7 This is a schematic diagram of the combined condenser-evaporator in Example 2 during application.

[0030] In the diagram: 100 - Heat exchanger core; 1 - Condensation channel; 1a - Condensation surface; 1b - Condensation fins; 2 - First evaporation channel; 2a - First evaporation surface; 2b - First evaporation fins; 3 - Second evaporation channel; 3a - Second evaporation surface; 3b - Second evaporation fins; 4 - Partition plate; 5 - Enclosed section; 6 - Semi-open section; 7 - Gas distribution section; 8 - Condensed liquid outlet section; 9 - Gas inlet; 10 - Condensed liquid outlet; 11 - First liquid distribution section; 12 - First gas-liquid mixed flow outlet section; 13 - First liquid inlet ; 14-First gas-liquid mixture outlet; 18-First pressure reducing device; 19-Second pressure reducing device; 20-First gas-liquid separator; 21-Second gas-liquid separator; 25-Bottle liquid; 30-Outer shell sidewall; 50-Nitrogen vapor; 51-Liquid nitrogen; 52-Oxygen-enriched liquid air; 53-First liquid; 54-Gas phase of the first gas-liquid separator; 55-Liquid phase of the second gas-liquid separator; 56-Gas phase of the second gas-liquid separator; 57-Oxygen-enriched gas; 58-Drain; 59-First gas-liquid mixture; 60-Upper head; 61-Lower head. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "assembly" and "connection" refer to forming a component that seals against fluids such as liquids and gases by means of two or more parts. Assembly and connection methods include welding, flange connections, bolting, bonding, or integral molding. The terms "connected" and "interconnected" refer to a state between two or more parts where fluids such as liquids and gases can flow.

[0033] The terms "downstream" and "upstream" refer to the direction of liquid or gas flow. The process of liquid or gas flowing from the inlet to the outlet is the process of flowing from upstream to downstream.

[0034] Terms indicating orientation, such as "below," "above," "parallel to the horizontal plane," and "perpendicular to the horizontal plane," all correspond to the orientation of the combined condenser-evaporator of this invention in normal use scenarios.

[0035] Furthermore, qualifiers such as "one" appearing in this document do not refer to a quantity limitation, but rather describe technical features not mentioned previously. Similarly, unless a noun is modified by a specific quantifier, it should be considered in this document as including both singular and plural forms; the technical solution may include either a singular or plural number of the technical feature.

[0036] It should be understood that in this invention, "at least one item" refers to one or more, and "more than one" refers to two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0037] The combined condenser-evaporator of this invention includes a heat exchanger core housed within a liquid storage container surrounded by an outer shell. The outer shell includes side walls, an upper end cap, and a lower end cap. During use, the liquid storage container contains a bottom liquid, and the heat exchanger core is placed within the bottom liquid. Preferably, the semi-open portion of the heat exchanger core is immersed in the bottom liquid.

[0038] Example 1 is a heat exchanger core according to one embodiment of the present invention. Figure 1 A three-dimensional view of the combined condenser-evaporator heat exchanger core of Embodiment 1 is shown. The heat exchanger core 100 includes a closed portion 5 and a semi-open portion 6, which are completely separated by a partition plate 4. Figure 2 As can be seen, both the closed section 5 and the semi-open section 6 are composed of multiple stacked channels. In the closed section 5, these channels are spaced-apart gas condensation channels 1 and first evaporation channels 2 that allow the first liquid portion to evaporate; in the semi-open section 6, these channels are spaced-apart gas condensation channels 1 and second evaporation channels 3 that allow the second liquid portion to evaporate.

[0039] The sealing section 5 is characterized by being completely isolated from the liquid in the storage container. This airtightness can be achieved either through a single, continuous shell or through a combination of a shell and a seal. The top and bottom of the sealing section 5 have components for distributing or collecting the first liquid and its partial evaporation products. Figure 1 In this configuration, the top of the sealing section 5 is provided with a first liquid inlet 13 and a first liquid distribution section 11, and the bottom of the sealing section 5 is provided with a first gas-liquid mixture outlet 14 and a first gas-liquid mixture outlet 12. Alternatively, the first liquid inlet 13 and the first liquid distribution section 11 can be located at the bottom of the sealing section 5, and the first gas-liquid mixture outlet 14 and the first gas-liquid mixture outlet 12 can be located at the top of the sealing section 5.

[0040] The semi-open section 6 is characterized by its condensation channel being completely disconnected from the liquid in the storage container, while its second evaporation channel is completely connected to the liquid in the storage container at both the top and bottom. The airtightness of the condensation channel is achieved by adding gas distribution sections at the top and bottom, a liquid outlet after condensation, and applying seals to the sides; while the second evaporation channel is only sealed on the sides. This design makes the closed section 5 equivalent to a "single-pass" heat exchanger, while the semi-open section 6 is equivalent to an immersion heat exchanger. Therefore, the advantages of two different heat exchange methods are integrated into a single combined heat exchanger.

[0041] On the side of the heat exchanger core (mainly referring to the fluid inlet and outlet positions), preferably, but not necessarily, on the same side, spanning the closed section 5 and the semi-open section 6, a gas distribution section 7 and a condensate outlet section 8 are provided. The gas distribution section 7 and the gas inlet 9 are located at the upper edge of the side, while the condensate outlet section 8 and the condensate outlet 10 are located at the lower edge of the side. The radius of the gas inlet 9 is larger than the radius of the condensate outlet 10. Since the gas to be condensed in the closed section 5 and the semi-open section 6 is the same type, they can share a single gas distribution section and condensate outlet section. This reduces manufacturing difficulty and cost, demonstrating the synergistic advantages of combining different types of condensation and evaporation equipment.

[0042] Figure 2 This is a side cross-sectional view of the heat exchanger core of the combined condenser-evaporator in Example 1. The heat exchanger core 100 preferably adopts a plate-fin structure. The plate-fin structure has the advantages of compact structure, large heat exchange area, and low pressure drop. It consists of a set of parallel plates, with corrugated or wave-shaped intermediate elements inserted between the plates to form a finned heat exchange structure. A stack of planar channels is formed between the stacked plates, allowing different fluids to enter the heat exchange relationship. During manufacturing, the plates, finned partitions, and other exchanger components are first stacked and compressed together, and then brazed together in a vacuum furnace at a temperature of 550°C to 900°C.

[0043] The channel through which the gas to be condensed flows is called condensation channel 1. In the enclosed section 5, condensation channel 1 and the first evaporation channel 2, which is used for the evaporation of the first liquid portion, are distributed at intervals that are approximately parallel to each other; in the semi-open section 6, condensation channel 1 and the second evaporation channel 3, which is used for the evaporation of the second liquid portion, are distributed at intervals that are approximately parallel to each other. In condensation channel 1, the surface that contacts the evaporation channel for heat exchange is called condensation surface 1a, and at least one condensation fin 1b is installed on the condensation surface. Correspondingly, in the first and second evaporation channels, the surfaces that contact the condensation channel 1 for heat exchange are called the first evaporation surface 2a and the second evaporation surface 3a, respectively, and the first evaporation fin 2b and the second evaporation fin 3b are installed on them, respectively. The direction of plate stacking ( Figure 1 The y-direction in the middle is related to the direction of extension of the condensation surface, the first evaporation surface, and the second evaporation surface. Figure 1 The x-direction in the middle is perpendicular to the x-direction. Figure 2 It is a side view section cut along the stacking direction y of the plates.

[0044] Figure 2 In the process, the gas to be condensed enters from the gas inlet 9 located above the side of the heat exchanger core, and is evenly distributed to each condensation channel 1 in the gas distribution section 7, flowing from top to bottom along the condensation channel 1 in a direction approximately perpendicular to the horizontal plane. Figure 1 (in the z-direction). During this process, the gas condenses. In the semi-open section 6, the vessel liquid, i.e., the second liquid, enters from below the second evaporation channel. The second liquid evaporates at least partially during indirect heat exchange with the gas and is discharged from above the evaporation channel. Due to the effect of thermosiphon, the vessel liquid, i.e., the second liquid, continuously circulates in the second evaporation channel 3.

[0045] Figure 2 In this process, the first liquid enters the first liquid distribution section 11 through the first liquid inlet 13 located at the top of the closed section 5, where it is distributed to each of the first evaporation channels 2. Then, it flows from top to bottom along the first evaporation channels 2 in a direction approximately perpendicular to the horizontal plane. Partially evaporated first liquid collects at the first gas-liquid mixture outlet 12 located at the bottom of the closed section 5, and then exits from the first gas-liquid mixture outlet 14. The downward flow of the first liquid in the channels is equivalent to falling film heat exchange, which has the advantages of small temperature difference and high heat exchange efficiency. Simultaneously, the gas-liquid mixture stream completely flows out of the heat exchange channel under the action of gravity, preventing impurities such as hydrocarbons contained in the stream from depositing in the evaporation channels, thus improving the safety of the equipment.

[0046] Figure 3A top view of the heat exchanger core of the combined condenser-evaporator of Embodiment 1 is shown. A partition plate 4 divides the heat exchanger core into a closed section 5 and a semi-open section 6. The top of the closed section 5 is the first liquid inlet 13. The closed section 5 and the semi-open section 6 share the same gas distribution section 7 and gas inlet 9 on the same side. At the top of the semi-open section 6, a condensation channel 1 sealed by a seal and a second evaporation channel 3 opening to the top are visible. The partition plate 4 is parallel to the condensation channel 1. The partition plate 4 can also be configured perpendicular to the condensation channel 1 (not shown), but the parallel configuration is preferred because it allows for the merging of either the gas or liquid distribution sections.

[0047] Figure 4 This is a cross-sectional view of the condensation surface along the condensation channel in the semi-open section 6. In the condensation surface 1a, the condensation fins 1b are longitudinally distributed.

[0048] Figure 5 This is a cross-sectional view of the evaporation surface along the first evaporation channel in the enclosed part 5. In the first evaporation surface 2a, the first evaporation fins 2b are longitudinally distributed.

[0049] Figure 6 This is a cross-sectional view of the semi-open section 6, taken along the evaporation surface of the second evaporation channel. In the second evaporation surface 3a, the second evaporation fins 3b are longitudinally distributed.

[0050] Example 2 is a schematic flow diagram of the combined condenser-evaporator of the present invention applied in cryogenic air separation. Taking CN1136426C as an example, it discloses a method and apparatus for producing high-purity nitrogen using a single tower and two immersion-type condenser-evaporators. After the feed gas is distilled in the single tower, nitrogen-rich vapor is generated at the top and oxygen-rich liquid is obtained at the bottom. In the first condenser, the nitrogen-rich vapor and a portion of the oxygen-rich liquid undergo indirect heat exchange, causing the nitrogen-rich vapor to condense into nitrogen-rich condensate; the oxygen-rich liquid is at least partially vaporized, generating oxygen-rich liquid and a second nitrogen-rich vapor. In the second condenser, the nitrogen-rich vapor and the oxygen-rich liquid from the first condenser undergo indirect heat exchange, causing the nitrogen-rich vapor to condense into nitrogen-rich condensate; the oxygen-rich liquid is at least partially vaporized, generating a waste stream.

[0051] Figure 7 A schematic flowchart illustrating the application of the combined condenser-evaporator of this invention to the aforementioned patented method is disclosed. In the diagram, the closed section 5 implements the function of the first condenser, and the open section 6 implements the function of the second condenser. Two gas-liquid separators are also added, further optimizing the process.

[0052] Figure 7In the process, the oxygen-rich liquid air 52 from the bottom of the tower is depressurized by the first depressurization device 18 and forms a gas-liquid mixture due to flash evaporation. This stream is separated in the first gas-liquid separator 20 to obtain the first liquid 53. The first liquid 53 enters the top of the closed section 5 of the heat exchanger core 100 through the first liquid inlet 13. The first gas-liquid separator 20 is not necessary, but it can completely remove the gas phase components from the first liquid 53. Without the interference of bubbles, the pure liquid first liquid 53 is more evenly distributed to each of the first evaporation channels in the first liquid distribution section 11, improving the performance of the heat exchanger.

[0053] The first liquid indirectly exchanges heat with nitrogen vapor 50 from the distillation column in the first evaporation channel. The first gas-liquid mixture 59 obtained after partial evaporation is sent to the second gas-liquid separator 21. The liquid phase 55 separated in the second gas-liquid separator is depressurized by the second pressure reducing device 19 and then sent to the outer shell of the combined condenser-evaporator to replenish the bottom liquid 25. The gas phase 54 from the first gas-liquid separator and the gas phase 56 from the second gas-liquid separator are combined and can be returned to the distillation column (not shown) as a circulating stream.

[0054] The semi-open section 6 is completely immersed in the bottom liquid 25. The bottom liquid 25 (i.e., the second liquid) enters from the inlet of the second evaporation channel at the bottom of the semi-open section 6 and indirectly exchanges heat with nitrogen vapor 50 from the distillation column. The partially evaporated bottom liquid 25 (the second liquid) is discharged from the top of the second evaporation channel and forms oxygen-enriched gas 57 at the top of the condenser-evaporator. After being discharged, the oxygen-enriched gas 57 can be reheated in the main heat exchanger. The semi-open section 6 can be regarded as an immersion-type condenser-evaporator with circulating heat exchange through the thermosiphon effect.

[0055] Nitrogen vapor 50 participates in indirect heat exchange with the first liquid and the second liquid in the condensation channel, and after condensation, liquid nitrogen 51 is obtained.

[0056] To prevent the accumulation of flammable impurities in the liquid, the condenser evaporator of the present invention also periodically generates a drain 58.

[0057] In the embodiments described above, oxygen gradually accumulates and its concentration increases during evaporation. For example, the oxygen content in each stream is approximately 40% in the oxygen-enriched liquid air 52, approximately 45% in the first liquid 53, approximately 50%–55% in the first gas-liquid mixed stream 59, approximately 55% in the liquid phase 55 of the second gas-liquid separator, and approximately 75%–80% in the reactor liquid 25. The higher the oxygen concentration, the higher the concentration of impurities it contains, significantly increasing the risk of explosion. Therefore, evaporating the reactor liquid in a closed channel poses a significant safety hazard. This invention employs a semi-open circulating evaporation system for the reactor liquid, greatly increasing the safety of the equipment.

[0058] In practice, combined condenser-evaporators can be installed either separately from or within a distillation column. For example, the column wall of the distillation column can be used as the outer shell sidewall of the combined condenser-evaporator, and an upper end cap 60 and a lower end cap 61 can be installed to form a closed liquid storage container.

[0059] The embodiments described herein are merely preferred embodiments of the present invention, and are used only to illustrate the technical solutions of the present invention and not to limit the present invention. Unless clearly indicated otherwise, each aspect or embodiment defined herein may be combined with any other one or more aspects or embodiments. In particular, any indicated preferred or advantageous feature may be combined with any other indicated preferred or advantageous feature. All technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation should be within the scope of the present invention.

Claims

1. A combined condenser-evaporator, characterized in that, It comprises: a condensation channel, through which gas flows and condenses; a first evaporation channel, through which a first liquid flows and indirectly exchanges heat with the gas, thus evaporating at least partially; and a second evaporation channel, through which a second liquid flows and indirectly exchanges heat with the gas, thus evaporating at least partially. It includes a heat exchanger core, which is immersed in a liquid in a vessel; The heat exchanger core includes stacked, spaced-apart condensing channels, a first evaporating channel, and a second evaporating channel, and also includes a partition plate that divides the heat exchanger core into a closed portion and a semi-open portion. The closed portion includes the condensing channel and the first evaporating channel, neither of which is in communication with the liquid in the reactor. The semi-open portion includes the condensing channel and the second evaporating channel, the condensing channel being not in communication with the liquid in the reactor, while the second evaporating channel is in communication with the liquid in the reactor, and the liquid in the reactor circulates and evaporates in the second evaporating channel. The first liquid and the second liquid are different.

2. The combined condenser-evaporator as described in claim 1, characterized in that, The flow direction of the gas in the condensation channel and the flow direction of the liquid in the first evaporation channel and the second evaporation channel are approximately perpendicular to the horizontal plane.

3. The combined condenser-evaporator as described in claim 2, characterized in that, The stacking direction of the condensation channel, the first evaporation channel, and the second evaporation channel is approximately orthogonal to the condensation surface, the first evaporation surface, and the second evaporation surface.

4. The combined condenser-evaporator as described in claim 3, characterized in that, The partition plate is approximately parallel to the condensation surface.

5. The combined condenser-evaporator as described in claim 4, characterized in that, The condensation channel, the first evaporation channel, and the second evaporation channel all include a plate-fin structure.

6. The combined condenser-evaporator as described in claim 5, characterized in that, The heat exchanger core has a gas distribution section on the upper side and a condensed liquid outlet section on the lower side.

7. The combined condenser-evaporator as described in claim 6, characterized in that, The top of the heat exchanger core enclosure has a first liquid distribution section and a first liquid inlet, and the bottom of the heat exchanger core enclosure has a first gas-liquid mixture outlet section and a first gas-liquid mixture outlet section, wherein the gas and the first liquid flow in the same direction.

8. The combined condenser-evaporator as described in claim 6, characterized in that, The bottom of the heat exchanger core enclosure has a first liquid distribution section and a first liquid inlet, and the top of the heat exchanger core enclosure has a first gas-liquid mixture outlet section and a first gas-liquid mixture outlet section, wherein the gas and the first liquid flow in opposite directions.

9. A distillation column system comprising the combined condenser-evaporator as described in claim 7, characterized in that, It also includes an optional first gas-liquid separator, a second gas-liquid separator, and a second pressure reducing device. The first liquid inlet of the heat exchanger core sealing part is connected to the first liquid outlet of the first gas-liquid separator, the first gas-liquid mixed flow outlet of the heat exchanger core sealing part is connected to the middle part of the second gas-liquid separator, and the liquid phase outlet of the second gas-liquid separator is connected to the middle part of the combined condenser-evaporator after passing through the second pressure reducing device.

10. The distillation column system as described in claim 9, characterized in that, It also includes a first pressure reducing device, through which the oxygen-rich liquid air generated by the distillation column system is reduced in pressure and then enters the first gas-liquid separator.

11. The distillation column system as described in claim 10, characterized in that, The gaseous products generated by the first gas-liquid separator and the second gas-liquid separator are mixed and returned to the distillation column system.

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