Air separation device for preparing liquid oxygen

Abstract

The utility model discloses an air separation device for preparing liquid oxygen, which relates to the technical field of liquid oxygen preparation, and comprises a rectifying tower body provided with a liquid inlet, a liquid outlet, an air inlet and an air outlet, the liquid inlet is positioned above the air inlet, the air outlet is positioned above the liquid outlet, and the rectifying tower body is provided with an air inlet and an air outlet. The positions, close to the liquid outlet and the gas outlet, of the rectifying tower body are concave inwards to form mounting grooves; the condenser is mounted in the mounting groove, close to the air outlet, of the rectifying tower body; the tower body is concaved inwards to form the mounting groove, the condenser and the heater are arranged in the mounting groove, the detachable plate is detachably arranged on the outer side of the mounting groove in a surrounding mode through matched arrangement of the detachable plate, the supporting rib plate, the connecting plate and the like, and therefore the condenser and the heater can be arranged on the outer side of the mounting groove in a surrounding mode. When a worker needs to overhaul and maintain the condenser and the heater, the detachable plate can be directly detached, operation is easy and convenient, and working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of liquid oxygen preparation, and more specifically, to an air separation device for producing liquid oxygen. Background Technology

[0002] Air separation technology refers to the process of separating different components from gases by utilizing the different boiling points of various gases at different temperatures through a gas separation system. The most commonly used air separation distillation method is cryogenic distillation. Compressed air from the air compressor is pre-cooled and purified by an air pre-cooling system. After impurities such as moisture, carbon dioxide, and hydrocarbons are removed by molecular sieves, a portion of the air is directly sent to the distillation column. In the distillation column, the rising vapor and the falling liquid exchange heat, resulting in high-purity nitrogen at the top of the column and high-purity oxygen at the bottom.

[0003] In related technologies, distillation columns mainly consist of a column body and a packing layer. Steam enters the column body from below the packing layer, while liquid enters from above. As the steam and liquid flow in opposite directions within the packing layer, they achieve thorough heat exchange. Furthermore, to prevent moisture from entering the rising gas after heat exchange, and to prevent gas from entering the falling liquid, condensers and heaters are installed within the column body. When the gas rises and passes through the condenser, any moisture entering the liquid is condensed and falls. When the liquid falls and passes through the heater, any gas entering the liquid is evaporated and rises, thus ensuring the purity of the distillation.

[0004] The problem with the relevant technology is that, since the tower body is designed as a straight cylindrical structure with tower covers installed at both ends for easy disassembly, and the condenser and heat exchanger require regular inspection and maintenance during use, the limitations of the tower body structure make it difficult for workers to disassemble or assemble the condenser or heat exchanger.

[0005] In summary, how to facilitate the disassembly and assembly of condensers or heaters is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide an air separation device for producing liquid oxygen, which can effectively improve the work efficiency of staff when maintaining and repairing condensers or heaters.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An air separation unit for producing liquid oxygen includes:

[0009] The distillation column body has a liquid inlet and a liquid outlet, as well as a gas inlet and a gas outlet. The liquid inlet is located above the gas inlet, and the gas outlet is located above the liquid outlet. The distillation column body has mounting grooves that are recessed inward near the liquid outlet and the gas outlet.

[0010] A packing unit is installed inside the distillation column and located between the liquid inlet and the gas inlet;

[0011] The condenser is installed in the mounting slot near the gas outlet of the distillation column body;

[0012] The heater is installed in the mounting slot near the liquid outlet of the distillation column.

[0013] Preferably, the mounting groove is provided with a support rib, the inner side of which is fixedly connected to the distillation column body, and the outer side extends radially to the edge of the mounting groove. A detachable plate is provided on the outer side of the mounting groove to close the mounting groove.

[0014] Preferably, a heat exchange tube is installed on the side of the mounting tank closest to the body of the distillation column, the heat exchange tube is filled with a heat exchange medium, and an insulation layer is provided on the side of the detachable plate facing the inside of the mounting tank.

[0015] Preferably, a connecting plate is fixedly connected to one side of the support rib extending to the edge of the mounting groove. The connecting plate and the detachable plate are respectively provided with connecting holes, and fasteners are set in the connecting holes to connect the detachable plate and the connecting plate.

[0016] Preferably, it also includes a liquid distributor, which is fixed inside the distillation column and located between the inlet and the packing unit. The inlet is connected to an inlet pipe extending into the distillation column and connected to the liquid distributor.

[0017] Preferably, the packing unit is provided in two sets, with the two sets of packing units distributed vertically at intervals, and a redistributor is provided between the two sets of packing units, wherein the upper port size of the redistributor is larger than the lower port size.

[0018] Preferably, the lower end of the redistributor is integrally connected to a flow guide, the flow guide is conical and the size of the lower port is larger than the size of the upper port, and a flow guide rod is provided on the inner wall of the connection end between the redistributor and the flow guide, the flow guide rod extending vertically downward.

[0019] Preferably, the distillation column body includes a column body and a column cover. Two column covers are provided and installed at both ends of the column body respectively. The liquid outlet and the gas outlet are respectively provided on the two column covers. The column covers are connected to the column body by flanges.

[0020] The technical solution provided in this application can achieve at least one of the following beneficial technical effects:

[0021] The tower body is recessed inward to form a mounting groove, within which the condenser and heater are installed. Through the coordinated arrangement of removable plates, supporting ribs, and connecting plates, the removable plates can be detachably fitted around the outside of the mounting groove. When maintenance or repair of the condenser and heater is needed, the removable plates can be directly removed, making operation simple, convenient, and improving work efficiency. Furthermore, by installing an insulation layer on one side of the removable plates, heat exchange between the external environment of the tower body and the condenser or heater is prevented, ensuring heat exchange efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the front cross-sectional structure of the air separation unit;

[0024] Figure 2 This is a top-view cross-sectional structural diagram of the air separation unit;

[0025] Figure 3 for Figure 1 Enlarged structural diagram at point A;

[0026] Figure 4 for Figure 1 Enlarged schematic diagram of the structure at point B.

[0027] Figures 1-4 In the accompanying drawings, the reference numerals include:

[0028] 1. Distillation column body; 101. Column body; 102. Column cover;

[0029] 2. Liquid inlet; 3. Liquid outlet; 4. Air inlet; 5. Air outlet;

[0030] 6. Mounting slot; 7. Packing unit; 8. Condenser; 9. Heater;

[0031] 10. Supporting ribs; 11. Removable plate; 12. Heat exchange tubes; 13. Insulation layer;

[0032] 14. Connecting plate; 15. Liquid distributor; 16. Inlet pipe;

[0033] 17. Redistributor; 18. Flow guide; 19. Flow guide rod. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in this utility model do not indicate any order, quantity, or importance. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. An embodiment of this application discloses an air separation device for producing liquid oxygen.

[0036] The core of this invention is to provide an air separation device for producing liquid oxygen.

[0037] Please refer to Figures 1 to 4 ,in Figure 1 This is a schematic diagram of the front cross-sectional structure of the air separation unit; Figure 2 This is a top-view cross-sectional structural diagram of the air separation unit; Figure 3 for Figure 1 Enlarged structural diagram at point A; Figure 4 for Figure 1 Enlarged schematic diagram of the structure at point B.

[0038] The air separation apparatus for producing liquid oxygen provided by this utility model includes a distillation column 1, a packing unit 7, a condenser 8, and a heater 9. The packing unit 7, condenser 8, and heater 9 are installed inside the distillation column 1. A liquid inlet 2 and an air inlet 4 are provided on the surface of the distillation column 1, with the liquid inlet 2 located above the air inlet 4. This allows air to enter from the lower end of the distillation column 1 through the air inlet 4 and flow upwards, while liquid enters from the upper end of the distillation column through the liquid inlet 2 and flows downwards. The packing unit 7 is located between the liquid inlet 2 and the air inlet 4. The upward-flowing gas and the downward-flowing liquid exchange heat in the packing unit 7, utilizing the difference in boiling points between oxygen and other gases in the air to achieve air separation, obtaining high-purity nitrogen and liquid oxygen.

[0039] Furthermore, the distillation column 1 includes a column body 101 and a column cover 102. The column body 101 has a cylindrical structure and is open at both ends. The column cover 102 is installed at both ends of the column body 101. Preferably, the two are connected by flanges. The liquid inlet 2 and the gas inlet 4 are respectively formed on the circumferential surface of the column body 101. In order to realize the discharge of nitrogen and liquid oxygen after air separation, gas outlet 5 and liquid outlet 3 are respectively formed on the two column covers 102, wherein the liquid outlet 3 is located below the gas outlet 5.

[0040] Reference Figure 1 A recessed mounting groove 6 is formed on the outer surface of the distillation column 1, i.e., the circumference of the column body 101. Specifically, a portion of the circumference of the column body 101 is recessed towards the center to form an annular mounting groove 6, with the outer side of the mounting groove 6 connected to the external space. Furthermore, two mounting grooves 6 are provided. One mounting groove 6 is located between the liquid inlet 2 and the gas outlet 5, and the other mounting groove 6 is located between the gas inlet 4 and the liquid outlet 3. The condenser 8 is installed in the upper mounting groove 6, and the heater 9 is installed in the lower mounting groove 6. When the heat-exchanged nitrogen flows upward through the condenser 8, the oxygen component within it can be recovered; when the heat-exchanged oxygen flows downward through the heater 9, the nitrogen component within it can be recovered, thereby improving the purity of the nitrogen and oxygen after distillation.

[0041] With the above structure, the condenser 8 and heater 9 are installed in the mounting slot 6, and the outside of the mounting slot 6 is connected to the outside space, which makes it convenient for staff to inspect and maintain the condenser 8 and heater 9.

[0042] The aforementioned condenser 8 and heater 9 may specifically include heat exchange tubes 12 installed in the mounting tank 6, and heat exchange medium filled in the heat exchange tubes 12, through which heat exchange is achieved with the gas and liquid in the distillation column 1.

[0043] Reference Figure 2 and Figure 3A removable plate 11 is also provided on the outside of the mounting slot 6. The removable plate 11 seals the mounting slot 6 to protect the condenser 8 and heater 9, preventing the external environment from affecting the heat exchange operation and preventing debris from entering the mounting slot 6. Specifically, a support rib 10 is provided in the mounting slot 6. The support rib 10 is vertically arranged and its upper and lower ends are integrally connected to the distillation column body 1. The side of the support rib 10 away from the distillation column body 1 extends to the edge of the mounting slot 6, and a connecting plate 14 is connected to this side. The connecting plate 14 is preferably configured to match the removable plate 11. When the removable plate 11 is fixed in the mounting slot 6, the outer side of the connecting plate 14 abuts against the inner side of the removable plate 11. Connection holes are provided at corresponding positions on the removable plate 11 and the connecting plate 14. The connection holes can be threaded holes. By screwing fasteners such as fastening bolts into the connection holes, the removable plate 11 can be fixed in the mounting slot 6. When disassembling, the fasteners can be unscrewed. In addition, to improve the heat exchange efficiency between the condenser 8 and heater 9 and the gas and liquid in the distillation column 1, an insulation layer 13 is provided on the side of the detachable plate 11 facing the mounting groove 6 to reduce the impact of the external environment on the condenser 8 and heater 9 and ensure heat exchange efficiency.

[0044] Reference Figure 1 and Figure 4 The packing unit 7 installed in the distillation column body 1 has two sets, and the two sets of packing units 7 are distributed vertically and horizontally. Specifically, each set of packing units 7 may include components such as support plates, packing layers and pressure plates. The support plates and pressure plates are arranged in parallel vertically, and the packing layer fills the space between them. It should be understood that both the support plates and pressure plates should be designed as porous structures to allow gas and liquid to pass through.

[0045] Furthermore, a redistributor 17 is provided between the two sets of packing units 7. The redistributor 17 has an inverted conical structure, with its upper port size larger than its lower port size. When gas and liquid exchange heat in the upper packing unit 7, the liquid tends to accumulate towards the inner wall of the distillation column 1, resulting in wall flow. When the liquid flows down the wall to the lower packing unit 7, it causes uneven distribution of gas and liquid, thus reducing heat exchange efficiency. By setting up the redistributor 17, the liquid flowing down the wall from the upper packing unit 7 can be guided towards the middle of the distillation column 1, so that the liquid can still fully contact the rising gas after falling into the lower packing unit 7.

[0046] Furthermore, a guide member 18 is connected to the lower end of the redistributor 17. The guide member 18 has a conical structure, and its lower port size is the same as the upper port size of the redistributor 17. It is used to guide the rising gas so that the gas rising to the upper packing unit 7 can fully contact the liquid. In addition, in order to prevent the liquid flowing down the inner wall of the redistributor 17 from flowing further down the inner wall of the guide member 18 to the outside of the packing unit 7, a guide rod 19 is provided on the inner wall of the connection end between the redistributor 17 and the guide member 18. The guide rod 19 extends vertically downward, and the liquid flowing along the inner wall of the redistributor 17 can flow vertically downward under the action of the guide rod 19.

[0047] The above provides a detailed description of an air separation device for producing liquid oxygen according to this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. An air separation apparatus for producing liquid oxygen, characterized in that, include: The distillation column body (1) has a liquid inlet (2) and a liquid outlet (3), as well as an air inlet (4) and an air outlet (5). The liquid inlet (2) is located above the air inlet (4), and the air outlet (5) is located above the liquid outlet (3). The distillation column body (1) has an inwardly recessed mounting groove (6) near the liquid outlet (3) and the air outlet (5). The packing unit (7) is installed inside the distillation column body (1) and is located between the liquid inlet (2) and the gas inlet (4); The condenser (8) is installed in the mounting slot (6) of the distillation column body (1) near the gas outlet (5); The heater (9) is installed in the mounting groove (6) of the distillation column body (1) near the liquid outlet (3).

2. The air separation apparatus for producing liquid oxygen according to claim 1, characterized in that, The mounting groove (6) is provided with a support rib (10). The inner side of the support rib (10) is fixedly connected to the distillation column body (1), and the outer side extends radially to the edge of the mounting groove (6). A detachable plate (11) is provided on the outer side of the mounting groove (6) to close the mounting groove (6).

3. The air separation apparatus for producing liquid oxygen according to claim 2, characterized in that, The mounting slot (6) is equipped with a heat exchange tube (12) on the side close to the inside of the distillation column (1). The heat exchange tube (12) is filled with heat exchange medium. The side of the detachable plate (11) facing the inside of the mounting slot (6) is provided with a heat insulation layer (13).

4. The air separation apparatus for producing liquid oxygen according to claim 2, characterized in that, The supporting rib (10) extends to one side of the edge of the mounting groove (6) and is fixedly connected to a connecting plate (14). The connecting plate (14) and the detachable plate (11) are respectively provided with connecting holes. Fasteners are set in the connecting holes to connect the detachable plate (11) and the connecting plate (14).

5. The air separation apparatus for producing liquid oxygen according to claim 1, characterized in that, It also includes a liquid distributor (15), which is fixed inside the distillation column (1) and located between the inlet (2) and the packing unit (7). The inlet (2) is connected to an inlet pipe (16) extending into the distillation column (1), and the inlet pipe (16) is connected to the liquid distributor (15).

6. The air separation apparatus for producing liquid oxygen according to claim 1, characterized in that, The packing unit (7) is provided in two sets, with the two sets of packing units (7) distributed vertically and horizontally. A redistributor (17) is provided between the two sets of packing units (7), and the upper port size of the redistributor (17) is larger than the lower port size.

7. The air separation apparatus for producing liquid oxygen according to claim 6, characterized in that, The lower end of the redistributor (17) is integrally connected to a flow guide (18). The flow guide (18) is conical and the size of the lower port is larger than that of the upper port. A flow guide rod (19) is provided on the inner wall of the connection end between the redistributor (17) and the flow guide (18). The flow guide rod (19) extends vertically downward.

8. An air separation apparatus for producing liquid oxygen according to any one of claims 1-7, characterized in that, The distillation column body (1) includes a column body (101) and a column cover (102). There are two column covers (102) installed at both ends of the column body (101). The liquid outlet (3) and the gas outlet (5) are respectively installed on the two column covers (102). The column covers (102) are connected to the column body (101) by flanges.

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