CN215636565U - Sealing gas system used in air separation device - Google Patents
Sealing gas system used in air separation device Download PDFInfo
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- CN215636565U CN215636565U CN202122055125.2U CN202122055125U CN215636565U CN 215636565 U CN215636565 U CN 215636565U CN 202122055125 U CN202122055125 U CN 202122055125U CN 215636565 U CN215636565 U CN 215636565U
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Abstract
The present invention relates to a seal gas system used in an air separation plant; the air-tight unit of the liquid expander comprises a first tee joint which is connected with a sealed air interface of the generator through the sealed air pipeline of the liquid expander; the cold box sealing gas unit comprises a tower top waste nitrogen gas outlet which is connected with a cold box sealing gas interface; the vehicle charging pump sealing gas unit comprises a sampling port pipeline, a second tee joint is arranged on the sampling port pipeline, and the third end of the second tee joint is connected with a vehicle charging pump sealing gas interface through an air vaporizer; the device has the advantages of simple structure, reasonable design, improvement on the seal gas of the cold box, the seal gas of the liquid power generation expansion machine and the seal gas of the liquid argon storage tank flushing pump, realization of stable operation of the device, and guarantee of product quality and resource saving.
Description
Technical Field
The utility model relates to the technical field of accessory parts of an air separation device, in particular to a sealing air system used in the air separation device.
Background
The sealed gas source of the air separation device mainly comprises nitrogen, polluted nitrogen, instrument air, clean, dry and oilless compressed air and self-sealed gas of a unit body; each sealed gas source has different functions according to different sealing equipment, pipelines and positions; taking the sealing gas of the liquid expander, the sealing gas of the cold box and the sealing gas of the vehicle charging pump as examples, the sealing gas can ensure the normal work of the liquid expander, the instrument, the cold box and the vehicle charging pump so as to realize the characteristic of normal operation of the whole system; however, the normal operation of the equipment is affected by the problems of low pressure, unstable gas source and the like of the sealing gas; particularly, the sealing gas of the vehicle filling pump generally adopts security nitrogen sealing gas, and in the actual use process, the nitrogen is directly mixed with the product gas (liquid argon) when the nitrogen leaks, so that the quality of the product gas is influenced.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides the sealing gas system used in the air separation plant, which has simple structure and reasonable design, improves the sealing gas of a cold box, the sealing gas of a liquid expander and the sealing gas of a liquid argon storage tank flushing pump, realizes the stable operation of the plant, ensures the product quality and saves resources.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a sealing gas system used in an air separation device comprises an air filter and a cold box which are connected with an air pipeline, wherein a rectifying tower, an argon rectifying tower, a subcooler, a low-pressure plate heat exchanger and a high-pressure plate heat exchanger are arranged in the cold box, the air filter is connected with a lower tower inlet of the rectifying tower through a cross joint, a five-stage supercharger, the high-pressure plate heat exchanger and a liquid expander sequentially through a compressor, the precooling device and an outlet of a purifying device, a third end of the cross joint is connected with a lower tower inlet of the rectifying tower through the low-pressure plate heat exchanger, a fourth end of the cross joint is connected with a humidifying air pipe network, an upper tower of the rectifying tower is connected with the argon rectifying tower, a tower bottom liquid phase outlet of the argon rectifying tower is connected with a liquid argon storage tank through a pipeline, the liquid argon storage tank is connected with a vehicle charging port through a vehicle charging pump, the sealing gas system comprises a sealing gas unit of the liquid expander, a sealing gas unit of the cold box and a sealing gas unit of the vehicle charging pump;
the five-stage supercharger comprises a first-stage compressor, a first-stage cooler, a second-stage compressor, a second-stage cooler, a third-stage compressor, a third-stage cooler, a fourth-stage compressor, a fourth-stage cooler, a fifth-stage compressor and a fifth-stage cooler which are sequentially connected through pipelines; the liquid expander sealed gas unit comprises a first tee joint arranged between the three-stage cooler and the four-stage compressor, and the third end of the first tee joint is connected with a sealed gas interface of the generator through a liquid expander sealed gas pipeline;
the cold box sealing gas unit comprises an upper tower top sewage nitrogen outlet of the rectifying tower, and the tower top sewage nitrogen outlet is connected with a cold box sealing gas interface through a subcooler, a low-pressure plate heat exchanger and a cold box sealing gas pipeline;
the vehicle charging pump sealing gas unit comprises a sampling port pipeline arranged between a tower bottom liquid phase outlet of the argon rectifying tower and the liquid argon storage tank, a second tee joint is arranged on the sampling port pipeline, and the third end of the second tee joint is connected with a vehicle charging pump sealing gas interface through an air vaporizer.
Preferably, a third tee joint is arranged on the sealed gas pipeline of the liquid expander, and the third end of the third tee joint is connected with the gas outlet of the screw compressor.
Preferably, a top gas phase outlet of the lower tower of the rectifying tower is connected with a low-pressure nitrogen pipe network through a low-pressure plate heat exchanger, a fourth tee joint is arranged between the low-pressure plate heat exchanger and the low-pressure nitrogen pipe network, and a third end of the fourth tee joint is connected with a cold box sealing gas pipeline through a first regulating valve.
Preferably, the cold box sealing gas pipelines are respectively connected with the two sides of the lower part of the cold box, the 25 th layer of the cold box, the 50 th layer of the cold box and the 69 th layer of the cold box.
Preferably, a fifth tee joint is arranged between the third end of the first tee joint and the sealed gas pipeline of the liquid expansion machine, and the third end of the fifth tee joint enters the lower tower inlet of the rectifying tower through the pressurization end of the expansion machine, the high-pressure plate type heat exchanger and the expansion end of the expansion machine to be connected.
Preferably, a second regulating valve is arranged on a sealed gas pipeline of the liquid expansion machine between the fifth tee joint and the third tee joint.
Preferably, a third regulating valve is arranged between the third end of the third tee joint and the air outlet of the screw compressor.
The utility model has the advantages of simple structure, reasonable design, stable operation of the device, product quality guarantee and resource saving by transforming the cold box sealing gas, the liquid expander sealing gas and the liquid argon storage tank flushing pump sealing gas.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the cold box of the present invention.
Fig. 3 is a schematic structural diagram of a generator and instrument seal gas unit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to FIGS. 1-3: the utility model relates to a sealed gas system used in an air separation device, which comprises an air filter 1 and a cold box 2 which are connected with an air pipeline, wherein the cold box 2 is internally provided with a rectifying tower 3, an argon rectifying tower 4, a subcooler 5, a low-pressure plate heat exchanger 6 and a high-pressure plate heat exchanger 7, the air filter 1 is connected with the lower tower inlet of the rectifying tower 3 through a four-way, a five-stage supercharger, the high-pressure plate heat exchanger 7 and a liquid expander 13 in sequence, the outlet of the purifying device 10 is connected with the lower tower inlet of the rectifying tower 3 through the four-way, the third end of the four-way is connected with the lower tower inlet of the rectifying tower 3 through the low-pressure plate heat exchanger 6, the fourth end of the four-way is connected with a humidifying air pipe network 14, the upper tower of the rectifying tower 3 is connected with the argon rectifying tower 4, the tower bottom liquid phase outlet 15 of the argon rectifying tower 4 is connected with a liquid argon storage tank 16 through a pipeline, the liquid argon storage tank 16 is connected with a vehicle filling port 18 through a vehicle filling pump 17, the sealing gas system comprises a sealing gas unit of the liquid expander, a sealing gas unit of the cold box and a sealing gas unit of the vehicle charging pump; the five-stage supercharger comprises a first-stage compressor 11, a first-stage cooler 19, a second-stage compressor 20, a second-stage cooler 21, a third-stage compressor 22, a third-stage cooler 23, a fourth-stage compressor 24, a fourth-stage cooler 25, a five-stage compressor 26 and a five-stage cooler 27 which are sequentially connected through pipelines; the liquid expander sealed gas unit comprises a first tee 28 arranged between the third-stage cooler 23 and the fourth-stage compressor 24, and the third end of the first tee 28 is connected with a sealed gas interface of the generator through a liquid expander sealed gas pipeline 29; the present invention is applied to an apparatus in an air separation plant, and it is preferable to use, as a seal gas, air between the three-stage cooler 23 and the four-stage compressor 24 in a five-stage supercharger for the seal gas of the liquid expander 13. The cold box sealing gas unit comprises an upper tower top sewage nitrogen outlet 30 of the rectifying tower 3, and the tower top sewage nitrogen outlet 30 is connected with a cold box sealing gas interface through a subcooler 5, a low-pressure plate heat exchanger 6 and a cold box sealing gas pipeline 31; the sealing gas used in the cold box 2 is preferably the waste nitrogen gas at the top of the rectifying tower 3; the vehicle-charging pump sealing gas unit comprises a sampling port pipeline 32 arranged between a tower bottom liquid phase outlet 15 of the argon rectifying tower 4 and the liquid argon storage tank 16, a second tee joint 33 is arranged on the sampling port pipeline 32, and the third end of the second tee joint 33 is connected with a vehicle-charging pump sealing gas interface 35 through an air type vaporizer 34. The sealing gas of the car-filling pump adopts liquid argon in the sampling port pipeline 32, and when the sealing gas of the car-filling pump leaks, the sealing gas and the product gas (liquid argon) belong to the same type, so that the defect of product gas pollution is avoided; when the liquid argon in the sampling port pipeline 32 is used, the liquid argon is gasified through the air vaporizer 34, so that the purpose of meeting the sealing gas requirement of the vehicle charging pump is achieved.
Further, a third tee joint 36 is arranged on the sealed gas pipeline 29 of the liquid expander, and the third end of the third tee joint 36 is connected with the gas outlet of the screw compressor 37. With the above arrangement, when the five-stage supercharger is not in operation, the screw compressor 37 supplies seal gas to the liquid expander 13.
Further, a top gas phase outlet of the lower tower of the rectifying tower 3 is connected with a low-pressure nitrogen pipe network 38 through a low-pressure plate heat exchanger 6, a fourth tee 39 is arranged between the low-pressure plate heat exchanger 6 and the low-pressure nitrogen pipe network 38, and a third end of the fourth tee 39 is connected with the cold box sealing gas pipeline 31 through a first regulating valve 40. The sealing gas used for supplying the cold box 2 can be low-pressure nitrogen generated in an air separation device besides polluted nitrogen, and can be supplemented by the low-pressure nitrogen when the pressure of the polluted nitrogen is insufficient, so that the defect that liquid nitrogen in a liquid nitrogen vacuum storage tank is used as the sealing gas in the prior art is overcome, and the defect that the liquid nitrogen is wasted and consumed in the prior art is overcome because the liquid nitrogen in the liquid nitrogen vacuum storage tank is used as the sealing gas.
Further, the cold box sealing gas pipes 31 are respectively connected to both sides of the lower portion of the cold box 2, the 25 th floor of the cold box 2, the 50 th floor of the cold box 2, and the 69 th floor of the cold box 2. The sealing gas in the cold box sealing gas pipeline 31 can realize the integral sealing of the interior of the cold box 2.
Further, a fifth tee joint 41 is arranged between the third end of the first tee joint 28 and the liquid expander sealed gas pipeline 29, and the third end of the fifth tee joint 41 enters the lower tower inlet of the rectifying tower 3 through the pressurization end of the expander 12, the high-pressure plate heat exchanger 7 and the expansion end of the expander 12 to be connected.
Further, a second regulating valve 42 is arranged on the sealed gas pipeline 29 of the liquid expander between the fifth tee joint 41 and the third tee joint 36. And a third regulating valve 43 is arranged between the third end of the third tee joint 36 and the air outlet of the screw compressor 37. Through setting up second governing valve 42 not only can adjust the source of seal gas according to the operating mode, can realize reducing the pressure to the compressed gas in the five-stage booster compressor simultaneously to guarantee that it satisfies the demand of seal gas.
The working principle of the utility model is as follows: in the normal operation process of the air separation device, when the five-stage supercharger normally works, compressed air between the three-stage cooler 23 and the four-stage compressor 24 passes through the third end of the first tee joint 28 and passes through the sealing air pipeline 29 of the liquid expander to be used as sealing air with the sealing part of the liquid expander 13, when the five-stage supercharger is in a stop state, the screw compressor 37 is started, the screw compressor 37 generates compressed air, the compressed air enters the sealing air pipeline 29 of the liquid expander through the third regulating valve 43 and the third end of the third tee joint 36, and the screw compressor 37 generates compressed air which enters the sealing part of the liquid expander 13 to be used as sealing air; when liquid argon is filled into a vehicle from a vehicle filling opening 18 through a vehicle filling pump 17, the liquid argon entering a liquid argon storage tank 16 is manually sampled and detected through a sampling opening pipeline 32 so as to ensure the quality and the purity of product gas; meanwhile, liquid argon coming out of the sampling port pipeline 32 is led out from the third end of the fifth tee joint 33, the liquid argon is vaporized through the air vaporizer 34 after being led out, the vaporized argon enters the sealing part of the vehicle charging pump 17 as sealing gas, and even if the sealing gas leaks, the argon and the liquid argon belong to gases with the same property and cannot pollute products. Further, the present invention can use the dirty nitrogen as the seal gas for the cold box 2 during normal operation, and can use the low pressure nitrogen to enter the low pressure nitrogen pipe network 38 as the seal gas for the cold box 2 when the amount of dirty nitrogen is insufficient or the pressure is insufficient. The device can be ensured to operate stably, the product quality can be ensured, and the resource can be saved.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A sealing gas system used in an air separation device comprises an air filter (1) and a cold box (2) which are connected with an air pipeline, wherein a rectifying tower (3), an argon rectifying tower (4), a subcooler (5), a low-pressure plate heat exchanger (6) and a high-pressure plate heat exchanger (7) are arranged in the cold box (2), the air filter (1) sequentially passes through a compressor (8), a precooling device (9), an outlet of a purifying device (10) is connected with a lower tower inlet of the rectifying tower (3) through a cross joint, a five-stage supercharger, a high-pressure plate heat exchanger (7) and a liquid expander (13), a third end of the cross joint is connected with a lower tower inlet of the rectifying tower (3) through the low-pressure plate heat exchanger (6), a fourth end of the cross joint is connected with an air pipe network (14), an upper tower of the rectifying tower (3) is connected with the argon rectifying tower bottom (4), a liquid phase outlet (15) of the rectifying tower (4) is connected with an argon storage tank (16) through a pipeline, liquid argon storage tank (16) are through filling car pump (17) with fill car mouth (18) and link to each other, its characterized in that: the sealing gas system comprises a sealing gas unit of the liquid expander, a sealing gas unit of the cold box and a sealing gas unit of the vehicle charging pump;
the five-stage supercharger comprises a first-stage compressor (11), a first-stage cooler (19), a second-stage compressor (20), a second-stage cooler (21), a third-stage compressor (22), a third-stage cooler (23), a fourth-stage compressor (24), a fourth-stage cooler (25), a fifth-stage compressor (26) and a fifth-stage cooler (27) which are sequentially connected through pipelines; the liquid expander sealing gas unit comprises a first tee joint (28) arranged between the three-stage cooler (23) and the four-stage compressor (24), and the third end of the first tee joint (28) is connected with a sealing gas interface of the generator through a liquid expander sealing gas pipeline (29);
the cold box sealing gas unit comprises an upper tower top sewage nitrogen outlet (30) of the rectifying tower (3), and the tower top sewage nitrogen outlet (30) is connected with a cold box sealing gas interface through a subcooler (5), a low-pressure plate heat exchanger (6) and a cold box sealing gas pipeline (31);
the vehicle charging pump sealing gas unit comprises a sampling port pipeline (32) arranged between a tower bottom liquid phase outlet (15) of an argon rectifying tower (4) and a liquid argon storage tank (16), a second tee joint (33) is arranged on the sampling port pipeline (32), and a third end of the second tee joint (33) is connected with a vehicle charging pump sealing gas interface (35) through an air type vaporizer (34).
2. The seal gas system for use in an air separation plant according to claim 1, characterized in that: and a third tee joint (36) is arranged on the sealed gas pipeline (29) of the liquid expander, and the third end of the third tee joint (36) is connected with the gas outlet of the screw compressor (37).
3. The seal gas system for use in an air separation plant according to claim 1, characterized in that: the top gas phase outlet of the lower tower of the rectifying tower (3) is connected with a low-pressure nitrogen pipe network (38) through a low-pressure plate heat exchanger (6), a fourth tee joint (39) is arranged between the low-pressure plate heat exchanger (6) and the low-pressure nitrogen pipe network (38), and the third end of the fourth tee joint (39) is connected with a cold box sealing gas pipeline (31) through a first regulating valve (40).
4. The seal gas system for use in the air separation plant according to claim 1 or 3, characterized in that: the cold box sealing gas pipeline (31) is respectively connected with the two sides of the lower part of the cold box (2), the 25 th layer of the cold box (2), the 50 th layer of the cold box (2) and the 69 th layer of the cold box (2).
5. The seal gas system for use in an air separation plant according to claim 1, characterized in that: and a fifth tee joint (41) is arranged between the third end of the first tee joint (28) and the sealed gas pipeline (29) of the liquid expander, and the third end of the fifth tee joint (41) enters the lower tower inlet of the rectifying tower (3) through the pressurization end of the expander (12), the high-pressure plate heat exchanger (7) and the expansion end of the expander (12) to be connected.
6. The seal gas system for use in an air separation plant according to claim 5, characterized in that: and a second regulating valve (42) is arranged on a sealed gas pipeline (29) of the liquid expander between the fifth tee joint (41) and the third tee joint (36).
7. The seal gas system for use in an air separation plant according to claim 2, characterized in that: and a third regulating valve (43) is arranged between the third end of the third tee joint (36) and the air outlet of the screw compressor (37).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122055125.2U CN215636565U (en) | 2021-08-28 | 2021-08-28 | Sealing gas system used in air separation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122055125.2U CN215636565U (en) | 2021-08-28 | 2021-08-28 | Sealing gas system used in air separation device |
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| Publication Number | Publication Date |
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| CN215636565U true CN215636565U (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122055125.2U Active CN215636565U (en) | 2021-08-28 | 2021-08-28 | Sealing gas system used in air separation device |
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- 2021-08-28 CN CN202122055125.2U patent/CN215636565U/en active Active
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