CN212081791U - Cryogenic air separation plant expander outage automatic safety device - Google Patents

Cryogenic air separation plant expander outage automatic safety device Download PDF

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Publication number
CN212081791U
CN212081791U CN202020710420.XU CN202020710420U CN212081791U CN 212081791 U CN212081791 U CN 212081791U CN 202020710420 U CN202020710420 U CN 202020710420U CN 212081791 U CN212081791 U CN 212081791U
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CN
China
Prior art keywords
heat exchanger
cold box
expander
rectangular
rectangular cold
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Active
Application number
CN202020710420.XU
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Chinese (zh)
Inventor
马旭东
王雪菊
王亚敏
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Handan Dayan Air Separation Equipment Co ltd
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Handan Dayan Air Separation Equipment Co ltd
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Publication date
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Priority to CN202020710420.XU priority Critical patent/CN212081791U/en
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Publication of CN212081791U publication Critical patent/CN212081791U/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04218—Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04309—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
    • F25J3/04315—Lowest pressure or impure nitrogen, so-called waste nitrogen expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/044—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a single pressure main column system only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04781—Pressure changing devices, e.g. for compression, expansion, liquid pumping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • F25J3/04824—Stopping of the process, e.g. defrosting or deriming; Back-up procedures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/0489—Modularity and arrangement of parts of the air fractionation unit, in particular of the cold box, e.g. pre-fabrication, assembling and erection, dimensions, horizontal layout "plot"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/70—Refluxing the column with a condensed part of the feed stream, i.e. fractionator top is stripped or self-rectified
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/02—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The utility model discloses a cryrogenic air separation plant expander outage automatic safety device, including the rectangle cold box, rectangle cold box side surface is equipped with power-off protection mechanism, be equipped with air cycle mechanism in the rectangle cold box. The beneficial effects of the utility model are that, when cutting off the power supply suddenly, pneumatic valve self-closing prevents that gas from continuing to get into the expander, and the protection expander does not damage to guarantee the normal operating of equipment and user's economic interests.

Description

Cryogenic air separation plant expander outage automatic safety device
Technical Field
The utility model relates to an air separation plant automatic protection technical field, more specifically say, relate to a cryrogenic air separation plant expander outage automatic safety device.
Background
The expansion machine is the heart of the air separation plant, is a very precise part, and plays a vital role in the whole set of air separation plant, so the expansion machine is guaranteed not to be damaged and is the premise of the normal operation of the whole set of air separation plant, and the normal operation of the expansion machine is guaranteed, so that the economic benefit of customers is indirectly guaranteed.
The existing similar products are manually operated, if sudden power failure occurs, an operator needs to close an air inlet valve of the expansion machine in time, if the expansion machine cannot be closed in time or is forgotten to be closed, the expansion machine is damaged, the expansion machine is a core component of the whole set of equipment, once the expansion machine is damaged, the whole set of equipment needs to be stopped, driving is less after the expansion machine is repaired, dozens of days are needed, and one month is possible at a low speed, so that great economic loss is caused to users.
SUMMERY OF THE UTILITY MODEL
To above defect, the utility model provides a cryrogenic air separation plant expander outage automatic safety device to the problem of solution.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a cryogenic air separation plant expander power-off automatic protection device comprises a rectangular cold box, wherein a power-off protection mechanism is arranged on the side surface of the rectangular cold box, and an air circulation mechanism is arranged in the rectangular cold box;
the air circulation mechanism comprises a fractionating tower on the inner surface of a rectangular cold box, the fractionating tower is fixedly connected with the rectangular cold box, a first heat exchanger is arranged in the rectangular cold box and fixedly connected with the rectangular cold box, a second heat exchanger is arranged on one side of the first heat exchanger and fixedly connected with the rectangular cold box, an expander and the first heat exchanger are arranged on the side surface of the rectangular cold box, the upper end of the second heat exchanger is provided with an air inlet pipe, the air inlet pipe is fixedly connected with the rectangular cold box, one end of the air inlet pipe is provided with an air inlet valve, a flow combining pipe is arranged between the first heat exchanger and the second heat exchanger, a first connecting pipe is arranged between the first heat exchanger and the fractionating tower, a second connecting pipe is arranged between the fractionating tower and the expander, a first air outlet pipe is arranged between the expander and the first heat exchanger, a second air outlet pipe is arranged at the upper end of the first heat exchanger, a third air outlet pipe is arranged between the second connecting pipe and;
the power-off protection mechanism comprises a mounting box on the side surface of the rectangular cold box, a rectangular opening is formed in the side surface of the mounting box, a pneumatic ball valve is mounted at one end of each connecting pipe, the pneumatic ball valve corresponds to the mounting box in position, sliding grooves are mounted on two sides of the rectangular opening, a baffle is mounted at the lower end of each sliding groove, the baffle is fixedly connected with the sliding grooves, damping cloth is mounted on the inner surfaces of the sliding grooves, a sliding plate is mounted in each sliding groove, and two sides of each.
Further, a handle is arranged at the upper end of the sliding plate.
Furthermore, a water chute is formed in the upper surface of the mounting box.
The utility model has the advantages that: when the power is suddenly cut off, the pneumatic valve is automatically closed, so that gas is prevented from continuously entering the expansion machine, the expansion machine is protected from being damaged, and the normal operation of equipment and the economic benefit of a user are ensured.
Drawings
FIG. 1 is a schematic structural view of an automatic power-off protection device for an expander of a cryogenic air separation plant of the present invention;
FIG. 2 is an enlarged schematic view of the mounting box;
FIG. 3 is a cross-sectional schematic view of the chute;
in the figure, 1, a rectangular cold box; 2. a fractionating column; 3. a first heat exchanger; 4. a second heat exchanger; 5. an expander; 6. an air inlet pipe; 7. an intake valve; 8. a confluence pipe; 9. a first connecting pipe; 10. a second connecting pipe; 11. a first air outlet pipe; 12. a second air outlet pipe; 13. a third gas outlet pipe; 14. a fourth air outlet pipe; 15. a rectangular opening; 16. a pneumatic ball valve; 17. a chute; 18. a baffle plate; 19. damping cloth; 20. a sliding plate; 21. a handle; 22. a water chute; 23. and (5) mounting the box.
Detailed Description
The utility model is described in detail with the attached drawings, as shown in fig. 1-3, the power-off automatic protection device of the cryogenic air separation plant expander comprises a rectangular cold box 1, a power-off protection mechanism is arranged on the side surface of the rectangular cold box 1, and an air circulation mechanism is arranged in the rectangular cold box 1;
the air circulation mechanism comprises a fractionating tower 2 on the inner surface of a rectangular cold box 1, the fractionating tower 2 is fixedly connected with the rectangular cold box 1, a first heat exchanger 3 is installed in the rectangular cold box 1, the first heat exchanger 3 is fixedly connected with the rectangular cold box 1, a second heat exchanger 4 is installed on one side of the first heat exchanger 3, the second heat exchanger 4 is fixedly connected with the rectangular cold box 1, an expander 5 is installed on the side surface of the rectangular cold box 1, an air inlet pipe 6 is installed at the upper ends of the first heat exchanger 3 and the second heat exchanger 4, the air inlet pipe 6 is fixedly connected with the rectangular cold box 1, an air inlet valve 7 is installed at one end of the air inlet pipe 6, a flow combining pipe 8 is installed between the first heat exchanger 3 and the second heat exchanger 4, a first connecting pipe 9 is installed between the first heat exchanger 3 and the fractionating tower 2, a second connecting pipe 10 is installed between the fractionating tower 2 and, a third air outlet pipe 13 is arranged between the second connecting pipe 10 and the second heat exchanger 4, and a fourth air outlet pipe 14 is arranged at the upper end of the second heat exchanger 4;
the power-off protection mechanism comprises a mounting box 23 on the side surface of the rectangular cold box 1, a rectangular opening 15 is formed in the side surface of the mounting box 23, a pneumatic ball valve 16 is mounted at one end of the second connecting pipe 10, the pneumatic ball valve 16 corresponds to the mounting box 23 in position, sliding grooves 17 are mounted on two sides of the rectangular opening 15, a baffle plate 18 is mounted at the lower end of the sliding groove 17, the baffle plate 18 is fixedly connected with the sliding grooves 17, damping cloth 19 is mounted on the inner surface of the sliding groove 17, a sliding plate 20 is mounted in the sliding groove 17, and two.
A handle 21 is mounted on the upper end of the sliding plate 20.
The upper surface of the mounting box 23 is provided with a water chute 22, and the water chute 22 is convenient for water drainage on the upper surface of the mounting box 23.
In the embodiment, the electric equipment of the equipment is controlled by an external controller, when the expander works normally, air enters the first heat exchanger 3 and the second heat exchanger 4 from the air inlet valve 7 and the air inlet pipe 6 respectively, is mixed with the air in the first heat exchanger 3 along the flow merging pipe 8 through the air in the second heat exchanger 4, then enters the lower end of the fractionating tower 2 through the first connecting pipe 9, is discharged from the upper end of the fractionating tower 2, is discharged into the expander 5 through the second connecting pipe 10, part of the gas discharged from the fractionating tower 2 is processed by the expander 5, is discharged through the first air outlet pipe 11, the first heat exchanger 3 and the second air outlet pipe 12, and part of the gas is discharged through the third air outlet pipe 13, the second heat exchanger 4 and the fourth air outlet pipe;
when power is suddenly cut off, the controller controls the pneumatic ball valve 16 to be automatically closed, at the moment, the gas continuously input to the expander 5 through the connecting pipe two 10 is blocked, the purpose of protecting the expander 5 is achieved, after the pneumatic ball valve 16 is closed, the controller controls the pneumatic ball valve 16 to be in a dormant state, the pneumatic ball valve 16 is prevented from being automatically opened when a call is received, when the power is needed to be opened, the pneumatic ball valve 16 is manually opened, the pneumatic ball valve 16 can be in a closed state under the action of the mounting box 23, the service life is prolonged, when the pneumatic ball valve 16 needs to be operated, the handle 21 is manually pulled upwards, the sliding plate 20 is driven to slide upwards by the movement of the handle 21, the rectangular opening 15 is opened, manual operation is facilitated, and the sliding plate 20 can be suspended in the sliding groove 17 while certain sealing performance is guaranteed through the action of the damping cloth 19.
Above-mentioned technical scheme has only embodied the utility model discloses technical scheme's preferred technical scheme, some changes that this technical field's technical personnel probably made to some parts wherein have all embodied the utility model discloses a principle belongs to within the protection scope of the utility model.

Claims (3)

1. The power-off automatic protection device for the cryogenic air separation plant expander comprises a rectangular cold box (1), and is characterized in that a power-off protection mechanism is arranged on the side surface of the rectangular cold box (1), and an air circulation mechanism is arranged in the rectangular cold box (1);
the air circulation mechanism comprises a fractionating tower (2) on the inner surface of a rectangular cold box (1), the fractionating tower (2) is fixedly connected with the rectangular cold box (1), a first heat exchanger (3) is installed in the rectangular cold box (1), the first heat exchanger (3) is fixedly connected with the rectangular cold box (1), a second heat exchanger (4) is installed on one side of the first heat exchanger (3), the second heat exchanger (4) is fixedly connected with the rectangular cold box (1), an expansion machine (5) is installed on the side surface of the rectangular cold box (1), an air inlet pipe (6) is installed at the upper end of the first heat exchanger (3) and the upper end of the second heat exchanger (4), the air inlet pipe (6) is fixedly connected with the rectangular cold box (1), an air inlet valve (7) is installed at one end of the air inlet pipe (6), a flow combining pipe (8) is installed between the first heat exchanger (3) and the second heat exchanger (4, a second connecting pipe (10) is arranged between the fractionating tower (2) and the expansion machine (5), a first air outlet pipe (11) is arranged between the expansion machine (5) and the first heat exchanger (3), a second air outlet pipe (12) is arranged at the upper end of the first heat exchanger (3), a third air outlet pipe (13) is arranged between the second connecting pipe (10) and the second heat exchanger (4), and a fourth air outlet pipe (14) is arranged at the upper end of the second heat exchanger (4);
the power-off protection mechanism comprises a mounting box (23) on the side surface of a rectangular cold box (1), a rectangular opening (15) is formed in the side surface of the mounting box (23), a pneumatic ball valve (16) is mounted at one end of a second connecting pipe (10), the pneumatic ball valve (16) corresponds to the mounting box (23), sliding grooves (17) are mounted on two sides of the rectangular opening (15), a baffle plate (18) is mounted at the lower end of each sliding groove (17), the baffle plate (18) is fixedly connected with the sliding grooves (17), damping cloth (19) is mounted on the inner surface of each sliding groove (17), sliding plates (20) are mounted in the sliding grooves (17), and two sides of each sliding plate (20) are connected with the.
2. The automatic power-off protection device for the cryogenic air separation plant expander according to claim 1, characterized in that a handle (21) is installed at the upper end of the sliding plate (20).
3. The automatic power-off protection device for the cryogenic air separation plant expander according to claim 1, characterized in that a water guide groove (22) is formed in the upper surface of the mounting box (23).
CN202020710420.XU 2020-05-04 2020-05-04 Cryogenic air separation plant expander outage automatic safety device Active CN212081791U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020710420.XU CN212081791U (en) 2020-05-04 2020-05-04 Cryogenic air separation plant expander outage automatic safety device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020710420.XU CN212081791U (en) 2020-05-04 2020-05-04 Cryogenic air separation plant expander outage automatic safety device

Publications (1)

Publication Number Publication Date
CN212081791U true CN212081791U (en) 2020-12-04

Family

ID=73593108

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202020710420.XU Active CN212081791U (en) 2020-05-04 2020-05-04 Cryogenic air separation plant expander outage automatic safety device

Country Status (1)

Country Link
CN (1) CN212081791U (en)

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