Rectifying tower suitable for rapid load change and start-stop

Abstract

The utility model relates to the field of deep cooling air separation devices, in particular to a rectifying tower suitable for rapid load change and start-stop, which comprises a tower body, the tower body comprises a rectifying section and a liquid storage section which are arranged from top to bottom, and an inner cavity of the rectifying section is communicated with an inner cavity of the liquid storage section through a connecting pipe; a cold insulation part is arranged on the outer side of the liquid storage section, the liquid storage section comprises an outer conical section, a barrel section and a pot-shaped section which are integrally formed from top to bottom, an anti-vortex structure is arranged in the pot-shaped section, and a plurality of anti-vortex channels are arranged in the anti-vortex structure. By means of the outer conical section, the barrel section and the pot-shaped section which are integrally formed from top to bottom of the liquid storage section, the diameter is enlarged, the liquid storage volume is increased, and the requirements for rapid load change and rapid start and stop of a complete set of air separation device are met; meanwhile, an anti-vortex structure is arranged in the pot-shaped section, so that stable flowing of liquid is guaranteed, and pipe system surge caused by carried bubbles is avoided.

Description

Technical Field

[0001] The utility model relates to the field of deep-cold air separation devices, in particular to a distillation tower suitable for rapid load change and start and stop. Background Art

[0002] With the development of industrial technology, the application of oxygen and nitrogen is becoming more and more extensive and in-depth, especially with the rapid development of new energy, the demand for bulk gases is growing by leaps and bounds. While the demand for gas products is increasing, the production of gas products is also showing diversified development needs, and the demand for fast and flexible operation and frequent start and stop is also increasing. As the core equipment of cryogenic distillation, whether the distillation tower can meet the needs of fast and flexible and frequent start and stop is particularly important, and it is worth studying its structural form.

[0003] At present, the structure of the distillation tower mainly adopts two distillation forms: sieve plate tower and structured packing tower. The distillation model has been basically finalized, but the technology of its liquid storage function and flow stabilization structure needs to be developed urgently. This technology is the key structural technology part to meet the rapid load change and rapid start and shutdown of the air separation unit.

[0004] However, the structure of the existing distillation tower cannot meet the requirements of rapid load change and rapid start and stop of the complete air separation unit. The existing structure itself has low liquid storage capacity. The storage of liquid refers to the section from the air inlet pipe at the bottom of the distillation tower as the starting point to the bottom of the distillation tower body as the end point. This section is the storage volume. This section of vertical distance, that is, the maximum value of the liquid level height of the cryogenic liquid, is generally 300-500mm in the prior art, because only the continuous and stable low liquid level supply capacity during normal operation is considered, and its liquid storage function is not considered. Therefore, when the load is changed, due to the small amount of stored liquid, the liquid is consumed very quickly, so that the distillation tower cannot provide a stable and continuous liquid spray flow, making it difficult to achieve load change and rapid start. In addition, the existing structure does not consider the setting of an anti-vortex structure, which makes it easy for the cryogenic liquid to carry bubbles, and the entrainment of gas and liquid makes the fluid phase complex, and it is impossible to ensure stable liquid flow.

[0005] Therefore, it is urgent to design a distillation tower suitable for rapid load change and start and stop to solve the above problems. Utility Model Content

[0006] The utility model aims to provide a distillation tower suitable for rapid load change and start-up and shutdown. The outer cone section, the cylinder section and the pot section are integrally formed from top to bottom in the liquid storage section, so as to expand the diameter and increase the storage volume of the liquid, thereby meeting the requirements of rapid load change and rapid start-up and shutdown of a complete set of air separation devices. At the same time, an anti-vortex structure is arranged in the pot section to ensure the stable flow of the liquid and avoid the surge of the piping system caused by the carrying of bubbles. In addition, a cold-keeping part is arranged on the outer side of the liquid storage section to reduce the cooling and evaporation of the cryogenic liquid, thereby facilitating the rapid load change and rapid start-up and shutdown of the air separation device.

[0007] In order to solve the above technical problems, the utility model provides a distillation tower suitable for rapid load change and start-up and shutdown, comprising a tower body, wherein the tower body comprises a distillation section and a liquid storage section arranged from top to bottom, a discharge pipe and a feed pipe are respectively arranged on one side of the distillation section from top to bottom, and a reflux pipe is arranged on the upper part of the other side, and the inner cavity of the distillation section is connected with the inner cavity of the liquid storage section through a connecting pipe;

[0008] A cold preservation part is provided on the outside of the liquid storage section, and the liquid storage section includes an outer cone section, a barrel section and a pot-shaped section integrally formed from top to bottom, a liquid extraction port is provided on one side of the barrel section, a liquid extraction pipe is passed through the liquid extraction port, an anti-vortex structure is provided in the pot-shaped section, a plurality of anti-vortex channels are provided in the anti-vortex structure, the bottom of the liquid extraction pipe extends into any one of the anti-vortex channels, and a discharge port connected to any one of the anti-vortex channels is provided at the bottom of the pot-shaped section, and the discharge port is connected to a discharge pipe 2.

[0009] Furthermore, several layers of tower plates are provided in the distillation section, and the several layers of tower plates are respectively fixed to the inner wall of the distillation section, and the several layers of tower plates are connected by connecting rod support components. Each layer of tower plates is provided with a downcomer, and the downcomers on two adjacent layers of tower plates are staggered up and down.

[0010] Furthermore, the connecting rod support assembly includes a support plate, a support frame and a supporting connecting rod. The support plate is fixed on the inner wall of the distillation section and is connected to the connecting pipe below. A through hole connected to the connecting pipe is opened on the support plate. The support frame is fixedly arranged on the support plate. The supporting connecting rod has two supporting connecting rods and is fixed to the support frame after passing through several layers of the tower plates respectively.

[0011] Furthermore, an overflow plate is provided on each layer of the tower tray, and the overflow plates on two adjacent layers of the tower trays are staggered in vertical arrangement.

[0012] Furthermore, the cold-insulating component is foam glass.

[0013] Furthermore, the anti-vortex structure includes a cover plate, a first support plate and a second support plate, the first support plate is fixed at the bottom of the cover plate, the second support plate has a pair of and is symmetrically arranged on both sides of the first support plate, and the top of the second support plate is fixed to the cover plate, and the anti-vortex channel is formed between any one of the second support plates and the first support plate, the cover plate and the inner bottom surface of the pot-shaped section, and the liquid extraction pipe passes through the cover plate and extends into the anti-vortex channel.

[0014] Furthermore, the two second support plates and the first support plate form an X shape or a cross shape.

[0015] Furthermore, the vertical distance between the feed pipe and the discharge port is 1250-1500 mm.

[0016] Furthermore, the liquid extraction tube is L-shaped, and the liquid extraction tube is connected to the reflux tube through an external pipeline.

[0017] Furthermore, supporting feet are provided on the outer side of the bottom of the tower body.

[0018] The beneficial effects of the utility model are:

[0019] 1. The utility model uses the outer cone section, the cylinder section and the pot section which are integrally formed from top to bottom in the liquid storage section to expand the diameter of the cavity of the lower section of the distillation tower, increase the storage volume of the liquid, and meet the requirements of short-term rapid load change and start-up and shutdown for a large amount of low-temperature liquid; at the same time, an anti-vortex structure is provided in the pot section to ensure the stable flow of the liquid and avoid the surge of the piping system caused by carrying bubbles; and the utility model is provided with a cold preservation part on the outside of the liquid storage section, which can reduce the cooling and evaporation of the low-temperature liquid, and facilitate the rapid load change and rapid start-up and shutdown of the air separation equipment.

[0020] 2. The utility model achieves additional cold preservation, improves the insulation coefficient, reduces the storage vaporization rate of the cryogenic liquid, and can effectively ensure the storage capacity of the cryogenic liquid by arranging the foam glass on the outside of the liquid storage section.

[0021] 3. The utility model has a structural design in which the liquid extraction tube passes through the cover plate and extends into the anti-vortex channel, so that the low-temperature liquid can be extracted from the anti-vortex channel, effectively ensuring that the liquid no longer carries bubbles and does not contain metal impurity particles, thereby ensuring the stable flow of liquid output and the cleanliness of the liquid.

[0022] 4. The utility model uses the design of the connecting rod support assembly to make the connection between several layers of tower plates and the inner wall of the distillation tower more stable. The liquid on the tower plates is collected to the support plate through the downcomer due to the effect of gravity, and then enters the connecting pipe through the through hole on the support plate, which can avoid liquid splashing and facilitate the liquid to quickly enter the liquid storage section. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of a distillation tower suitable for rapid load change and start-stop of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the anti-eddy current structure of the utility model;

[0026] In the figure: 1-tower body, 2-connecting pipe, 3-liquid extraction pipe, 4-anti-vortex structure, 5-tower plate, 6-downcomer, 7-connecting rod support assembly, 8-overflow plate, 9-support leg, 11-rectifying section, 12-liquid storage section, 111-discharge pipe one, 112-feed pipe, 113-reflux pipe, 121-outer cone section, 122-barrel section, 123-pot section, 1221-liquid extraction port, 1231-discharge pipe two, 41-cover plate, 42-first support plate, 43-second support plate, 423-anti-vortex channel, 71-support plate, 72-support frame, 73-support connecting rod. DETAILED DESCRIPTION

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

[0028] In a specific embodiment of the present invention, Figure 1-2 As shown, a distillation tower suitable for rapid load change and start-up and shutdown comprises a tower body 1, the tower body 1 comprises a distillation section 11 and a liquid storage section 12 arranged from top to bottom, a discharge pipe 111 and a feed pipe 112 are respectively arranged on one side of the distillation section 11 from top to bottom, a reflux pipe 113 is arranged on the upper side of the other side, and the inner cavity of the distillation section 11 is connected with the inner cavity of the liquid storage section 12 through a connecting pipe 2;

[0029] A cold preservation part is provided on the outside of the liquid storage section 12. The liquid storage section 12 includes an outer conical section 121, a barrel section 122 and a pot-shaped section 123 which are integrally formed from top to bottom. A liquid extraction port 1221 is provided on one side of the barrel section 122. A liquid extraction pipe 3 is passed through the liquid extraction port 1221. An anti-vortex structure 4 is provided in the pot-shaped section 123. A plurality of anti-vortex channels 423 are provided in the anti-vortex structure 4. The bottom of the liquid extraction pipe 3 extends into any one of the anti-vortex channels 423. A discharge port connected to any one of the anti-vortex channels 423 is provided at the bottom of the pot-shaped section 123. The discharge port is connected to a discharge pipe 1231.

[0030] Specifically, a plurality of tower trays 5 are provided in the rectifying section 11, and the plurality of tower trays 5 are respectively fixed to the inner wall of the rectifying section 11, and the plurality of tower trays 5 are connected by a connecting rod support assembly 7, and a downcomer 6 is provided on each tower tray 5, and the downcomers 6 on two adjacent tower trays 5 are staggered up and down; an overflow plate 8 is also provided on each tower tray 5, and the overflow plates 8 on two adjacent tower trays 5 are staggered up and down;

[0031] The connecting rod support assembly 7 includes a support plate 71, a support frame 72 and a support connecting rod 73. The support plate 71 is fixed on the inner wall of the distillation section 11, and a connecting pipe 2 is connected to the bottom thereof. A through hole connected to the connecting pipe 2 is opened on the support plate 71. The support frame 72 is fixedly arranged on the support plate 71. The support connecting rod 73 has two supporting connecting rods 73, which are respectively fixed to the support frame 72 after passing through several layers of tower plates 5.

[0032] Specifically, the cold-insulating component is foam glass. In this embodiment, by laying 50 mm thick foam glass, the thermal insulation coefficient can be greatly improved, the evaporation of the cryogenic liquid can be reduced, and the storage capacity of the cryogenic liquid can be effectively guaranteed.

[0033] Specifically, the anti-vortex structure 4 includes a cover plate 41, a first support plate 42 and a second support plate 43. The first support plate 42 is fixed at the bottom of the cover plate 41. The second support plate 43 has a pair of symmetrically arranged on both sides of the first support plate 42, and the top of the second support plate 43 is fixed to the cover plate 41. An anti-vortex channel 423 is formed between any second support plate 43 and the first support plate 42, the cover plate 41 and the inner bottom surface of the pot-shaped section 123. The liquid extraction pipe 3 passes through the cover plate 41 and extends into the anti-vortex channel 423. The liquid extraction pipe 3 is L-shaped and is connected to the reflux pipe 113 through an external pipe. This design can effectively ensure that the extracted liquid no longer carries bubbles and does not contain metal impurity particles, and can ensure the stable flow of liquid output and the cleanliness of the liquid.

[0034] In this embodiment, Figure 2As shown, the two second support plates 43 and the first support plate 42 form an X-shape or a cross-shape, and the number of anti-vortex channels 423 in the figure is four; of course, in other embodiments, the through hole on the cover plate 41 can be set above any anti-vortex channel 423; in addition, in other embodiments, the lower end of the liquid suction tube can also be designed as a multi-tube structure, which extends into each anti-vortex channel respectively, and the upper ends are gathered and then connected to the return pipe 113 through an external pipeline.

[0035] In this embodiment, the vertical distance h between the feed pipe 112 and the discharge port is 1250-1500 mm, which is much larger than the liquid storage capacity in the existing structure and meets the requirements of rapid load change and rapid start and stop of the complete air separation unit.

[0036] In this embodiment, a support foot 9 is provided on the outer side of the bottom of the tower body 1 .

[0037] The utility model expands the diameter of the cavity of the lower section of the distillation tower and increases the storage volume of the liquid through the outer cone section, the cylinder section and the pot section which are integrally formed from top to bottom of the liquid storage section, so as to meet the requirements of rapid load change and rapid start and stop of the complete air separation device; at the same time, an anti-vortex structure is arranged in the pot section to ensure the stable flow of the liquid and avoid the surge of the piping system caused by the bubbles carried; and the utility model is provided with a cold-insulating part on the outer side of the liquid storage section, so as to reduce the cold conduction and evaporation of the cryogenic liquid and facilitate the rapid load change and rapid start and stop of the air separation device.

[0038] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A distillation tower suitable for rapid load change and start-up and shutdown, characterized in that: The tower body (1) comprises a distillation section (11) and a liquid storage section (12) arranged from top to bottom, a discharge pipe (111) and a feed pipe (112) are arranged on one side of the distillation section (11) from top to bottom, and a reflux pipe (113) is arranged above the other side, and the inner cavity of the distillation section (11) is connected to the inner cavity of the liquid storage section (12) through a connecting pipe (2). A cold preservation component is provided on the outside of the liquid storage section (12). The liquid storage section (12) comprises an outer conical section (121), a barrel section (122) and a pot-shaped section (123) which are integrally formed from top to bottom. A liquid extraction port (1221) is provided on one side of the barrel section (122). A liquid extraction pipe (3) is passed through the liquid extraction port (1221). An anti-vortex structure (4) is provided in the pot-shaped section (123). A plurality of anti-vortex channels (423) are provided in the anti-vortex structure (4). The bottom of the liquid extraction pipe (3) extends into any one of the anti-vortex channels (423). A discharge port which is connected to any one of the anti-vortex channels (423) is provided at the bottom of the pot-shaped section (123). The discharge port is connected to a second discharge pipe (1231).

2. A distillation tower suitable for rapid load change and start-up and shutdown according to claim 1, characterized in that: A plurality of tower plates (5) are arranged in the distillation section (11), the tower plates (5) are respectively fixed to the inner wall of the distillation section (11), and the tower plates (5) are connected to each other via a connecting rod support assembly (7). A downcomer (6) is arranged on each tower plate (5), and the downcomers (6) on two adjacent tower plates (5) are staggered up and down.

3. A distillation tower suitable for rapid load change and start-up and shutdown according to claim 2, characterized in that: The connecting rod support assembly (7) comprises a supporting plate (71), a supporting frame (72) and a supporting connecting rod (73); the supporting plate (71) is fixed on the inner wall of the distillation section (11) and the connecting pipe (2) is connected thereto; a through hole communicating with the connecting pipe (2) is provided on the supporting plate (71); the supporting frame (72) is fixedly arranged on the supporting plate (71); and the supporting connecting rod (73) has two connecting rods (73) which respectively pass through a plurality of layers of the tower plates (5) and are fixed to the supporting frame (72).

4. A distillation tower suitable for rapid load change and start-up and shutdown according to claim 2, characterized in that: An overflow plate (8) is also provided on each layer of the tower tray (5), and the overflow plates (8) on two adjacent layers of the tower trays (5) are staggered in vertical arrangement.

5. A distillation tower suitable for rapid load change and start-up and shutdown according to claim 1, characterized in that: The cold-insulating component is foam glass.

6. A distillation tower suitable for rapid load change and start-up and shutdown according to claim 1, characterized in that: The anti-vortex structure (4) comprises a cover plate (41), a first support plate (42) and a second support plate (43); the first support plate (42) is fixed to the bottom of the cover plate (41); the second support plate (43) has a pair of symmetrically arranged on both sides of the first support plate (42); the top of the second support plate (43) is fixed to the cover plate (41); the anti-vortex channel (423) is formed between any one of the second support plates (43) and the first support plate (42), the cover plate (41) and the inner bottom surface of the pot-shaped section (123); the liquid extraction pipe (3) passes through the cover plate (41) and extends into the anti-vortex channel (423).

7. A distillation tower suitable for rapid load change and start-up and shutdown according to claim 6, characterized in that: The two second support plates (43) and the first support plate (42) form an X shape or a cross shape.

8. A distillation tower suitable for rapid load change and start-up and shutdown according to claim 1, characterized in that: The vertical distance (h) between the feed pipe (112) and the discharge port is 1250 to 1500 mm.

9. A distillation tower suitable for rapid load change and start-up and shutdown according to claim 1, characterized in that: The liquid extraction pipe (3) is L-shaped, and the liquid extraction pipe (3) is connected to the return pipe (113) through an external pipeline.

10. A distillation tower suitable for rapid load change and start-up and shutdown according to claim 1, characterized in that: Support feet (9) are provided on the outer side of the bottom of the tower body (1).

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