CN110185632B - Variable-flow supercritical working medium semi-open centrifugal compression device and method - Google Patents
Variable-flow supercritical working medium semi-open centrifugal compression device and method Download PDFInfo
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- CN110185632B CN110185632B CN201910312712.XA CN201910312712A CN110185632B CN 110185632 B CN110185632 B CN 110185632B CN 201910312712 A CN201910312712 A CN 201910312712A CN 110185632 B CN110185632 B CN 110185632B
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- 230000006835 compression Effects 0.000 title claims abstract description 54
- 238000007906 compression Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000003860 storage Methods 0.000 claims abstract description 13
- 244000126211 Hericium coralloides Species 0.000 claims abstract description 8
- 230000003068 static effect Effects 0.000 claims abstract description 8
- 238000013461 design Methods 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 10
- 239000003921 oil Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 239000010687 lubricating oil Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a variable-flow supercritical working medium semi-open centrifugal compression device and a variable-flow supercritical working medium semi-open centrifugal compression method, wherein the device comprises a variable-flow local air inlet supercritical working medium semi-open centrifugal compressor, a motor, a spindle support, a thrust bearing, a dry gas seal, a comb tooth seal, a compressor shell, a static blade, a movable blade, a through flow channel, a non-through flow channel inlet baffle, a compressor rotating wheel, a non-through flow channel outlet baffle, a dry gas storage tank and a dry gas seal pipeline.
Description
Technical Field
The invention relates to the technical field of supercritical working medium compression, in particular to a variable-flow supercritical working medium semi-open centrifugal compression device and a working method.
Background
In the test system of the supercritical carbon dioxide Brayton cycle or Allam cycle, the design pressure is between 20 and 32MPa, the energy density of the system is high, and the volume of the compressor equipment is small. For the advanced circulation test system with high design pressure parameters, the inlet parameters of the compressor are mostly selected near the critical point, so that the volume flow of the supercritical working medium is usually smaller under the design working condition of many research institutions to reduce test cost, and therefore, the blade height of the supercritical working medium compressor is too small, and the compression efficiency is low. The prior art can only provide a feasible scheme for the compression of the gas working medium with the tiny volume flow rate, the design parameters of which are below 5MPa, namely, a screw compression mode is adopted, and for the compression mode of the gas working medium with the tiny volume flow rate, the design parameters of which are more than 10MPa, the vane height of a centrifugal compressor designed by adopting the conventional centrifugal compressor mode is too short, the isentropic compression efficiency is low, the design flow rate and the pressure parameters of the centrifugal compressor are single, and the design flow rate can not be increased or reduced under the condition that the design pressure is kept unchanged. The prior art does not provide a high-pressure-grade, design-flow-adjustable and efficient small-volume-flow supercritical working medium compression scheme.
Disclosure of Invention
The invention aims to solve the problems and provide a variable-flow supercritical working medium semi-open centrifugal compression device and a working method thereof, which can realize high-efficiency compression of high-pressure-grade supercritical working medium with small volume flow.
The invention realizes the above purpose through the following technical scheme:
The variable flow supercritical working medium semi-open centrifugal compression device comprises a thrust bearing 1, a main shaft 2, a first main shaft support 3-1, a second main shaft support 3-2, a motor 4, a dry gas storage tank 15, a dry gas sealing pipeline 16 and a variable flow local air inlet supercritical working medium semi-open centrifugal compressor 17, wherein the thrust bearing 1, the first main shaft support 3-1, the motor 4, the second main shaft support 3-2 and the variable flow local air inlet supercritical working medium semi-open centrifugal compressor 17 are sequentially arranged on the main shaft 2 from one end of the main shaft 2; the variable-flow partial-inlet supercritical working medium semi-open centrifugal compressor 17 is composed of a dry gas seal 5, a comb tooth seal 6, a compressor shell 7, a static blade 8, a movable blade 10, a non-through flow channel inlet baffle 12, a compressor runner 13 and a non-through flow channel outlet baffle 14, wherein the movable blade 10, the non-through flow channel inlet baffle 12 and the non-through flow channel outlet baffle 14 are arranged on the compressor runner 13, the movable blade 10, the compressor runner 13, the non-through flow channel inlet baffle 12 and the non-through flow channel outlet baffle 14 form a compressor semi-open impeller, a processing surface on one side of the movable blade 10, a processing surface on the bottom of the compressor runner 13 and a processing surface on one side of the adjacent movable blade form an expanded U-shaped semi-open supercritical working medium compression channel, the minimum cross section of the semi-open supercritical working medium compression channel is an inlet of the semi-open supercritical compression channel, the maximum cross section of the semi-open supercritical working medium compression channel is an outlet of the semi-open supercritical working medium compression channel, the non-through channel inlet and the non-through channel outlet of the non-through channel 11 are arranged on the non-through channel end face of the non-through channel 9, the non-through channel end face of the non-through channel is the non-through channel 7 and the non-through channel end face of the non-through channel 11 is arranged on the non-through channel end face of the non-flow channel 7; the dry gas storage tank 15 is connected with the dry gas seal 5 through a dry gas seal pipeline 16, the dry gas seal 5, the comb teeth seal 6 and a compressor semi-open impeller of the variable flow partial air inlet supercritical working medium semi-open centrifugal compressor 17 are sequentially positioned on the main shaft 2, and the dry gas seal 5 is close to the second main shaft support 3-2.
The number of the through-flow channels 11 of the variable-flow partial-inlet supercritical working medium semi-open centrifugal compressor 17 is an even number greater than or equal to 2, and the two through-flow channels 11 with opposite positions are of a space center symmetrical structure taking the central line of the main shaft as the central line.
The variable flow partial intake supercritical working medium semi-open centrifugal compressor 17 adjusts the number of the through-flow channels 11 by increasing or decreasing the number of the non-through-flow channel inlet baffle plates 12 and the non-through-flow channel outlet baffle plates 14 of the supercritical working medium compression channels in pairs, and the two through-flow channels 11 with opposite positions after the adjustment are still in a central symmetrical structure with the central line of the main shaft as the central line.
The air inlet mode of the variable flow local air inlet supercritical working medium semi-open centrifugal compressor 17 is axial air inlet and radial air outlet.
The motor has 2 or more pole pairs and is capable of operating at 1 or more rotational speeds.
The variable flow partial air inlet supercritical working medium semi-open centrifugal compressor 17 adopts one or more sections of comb seal 6 internal leakage control modes, at least one section of comb seal 6 is arranged on the main shaft 2, and the rest of comb seal 6 is selectively arranged at any gap between the semi-open impeller of the compressor and the compressor shell 7.
The working method of the variable flow supercritical working medium semi-open centrifugal compression device mainly comprises three processes, namely a preparation stage, an operation stage and a shutdown stage, wherein the preparation stage supplies lubricating oil to a first main shaft support 3-1 and a second main shaft support 3-2 by an oil supply system, and high-pressure clean gas is sealed to a dry gas seal 5 by a dry gas storage tank 15 through a dry gas seal pipeline 16; after the operation is ready, the motor 4 is started and quickly rises to the designed rotating speed, the supercritical working medium flowing in along the axial inlet of the compressor shell 7 is sucked into the inlet of the through flow channel 11 of the compressor semi-open impeller with central symmetry, is diffused to the through flow channel outlet 9 along the expanding through flow channel 11 at a rising speed, then enters the static blade 8 channel on the compressor shell 7 for deceleration and pressure rising, and then flows out of the local air inlet supercritical working medium semi-open centrifugal compressor 17 with variable flow from the radial outlet of the compressor shell 7; in the stopping stage, the motor 4 stops providing power, the variable-flow local air inlet supercritical working medium semi-open centrifugal compressor 17 is stopped rapidly, after the variable-flow local air inlet supercritical working medium semi-open centrifugal compressor 17 is stopped, the dry gas storage tank 15 stops providing high-pressure pure gas for the dry gas seal 5, and the oil supply system performs post lubrication on the first main shaft support 3-1 and the second main shaft support 3-2 for 20 minutes and stops working.
According to the design flow modifying method of the variable flow supercritical working medium semi-open centrifugal compressor, when the variable flow supercritical working medium semi-open centrifugal compressor is in a stop state, the compressor shell 7 is opened, the compressor semi-open impeller of the variable flow local air inlet supercritical working medium semi-open centrifugal compressor 17 is taken out, the number of through flow channels 11 is adjusted by increasing or reducing the number of non-through flow channel inlet baffles 12 and non-through flow channel outlet baffles 14 of the supercritical working medium compression channels in pairs according to the modified design flow parameters, and after the number is adjusted, the two through flow channels 11 which are opposite in position on the compressor semi-open impeller are still of a central symmetrical structure taking the central line of a main shaft as the central line, and when the compressor semi-open impeller is put back to the original position, the compressor shell 7 is closed.
The invention has the beneficial effects that:
at present, no efficient small-volume-flow supercritical working medium compression scheme which can be used for solving the problems of high pressure grade, adjustable design flow and high efficiency in a supercritical carbon dioxide Brayton cycle or Allam cycle test system is yet seen. The invention provides a variable flow supercritical working medium semi-open centrifugal compression device with low manufacturing cost and high operability. Compared with a centrifugal compressor with the same design parameters and full-periphery air intake, the invention adopts the scheme of the partial air intake centrifugal compressor to improve the height of the blades, so the invention has the advantages of large blade height and large size, can reduce the loss of an end boundary layer caused by the too low blade height, has high isentropic compression efficiency, and can realize the increase or decrease of the design flow under the condition that the design pressure is kept unchanged by increasing or decreasing the number of through flow channels in pairs; compared with the closed type local air inlet compressor impeller, the semi-open impeller of the local air inlet compressor has the advantages of simpler processing and lower cost; the invention adopts the dry gas sealing device, has the advantage of the leakage working medium flow approaching zero, adopts the motor with one or more pairs of magnetic poles, so that the supercritical working medium semi-open centrifugal compression device with variable flow can efficiently work at a plurality of rotating speeds, and provides various pressure and working medium flow parameters according to the parameter requirements of a test system.
Drawings
FIG. 1 is a schematic diagram of a variable flow supercritical working medium semi-open centrifugal compression device of the present invention.
Fig. 2 is a left side view of a compressor semi-open impeller of the variable flow supercritical working medium semi-open centrifugal compression device of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
As shown in fig. 1 and 2, the variable flow supercritical working medium semi-open centrifugal compression device comprises a thrust bearing 1, a main shaft 2, a first main shaft support 3-1, a second main shaft support 3-2, a motor 4, a dry gas storage tank 15, a dry gas sealing pipeline 16 and a variable flow local air inlet supercritical working medium semi-open centrifugal compressor 17, wherein the thrust bearing 1, the first main shaft support 3-1, the motor 4, the second main shaft support 3-2 and the variable flow local air inlet supercritical working medium semi-open centrifugal compressor 17 are sequentially arranged on the main shaft 2 from one end of the main shaft 2; the variable-flow partial-inlet supercritical working medium semi-open centrifugal compressor 17 is composed of a dry gas seal 5, a comb tooth seal 6, a compressor shell 7, a static blade 8, a movable blade 10, a non-through flow channel inlet baffle 12, a compressor runner 13 and a non-through flow channel outlet baffle 14, wherein the movable blade 10, the non-through flow channel inlet baffle 12 and the non-through flow channel outlet baffle 14 are arranged on the compressor runner 13, the movable blade 10, the compressor runner 13, the non-through flow channel inlet baffle 12 and the non-through flow channel outlet baffle 14 form a compressor semi-open impeller, a processing surface on one side of the movable blade 10, a processing surface on the bottom of the compressor runner 13 and a processing surface on one side of the adjacent movable blade form an expanded U-shaped semi-open supercritical working medium compression channel, the minimum cross section of the semi-open supercritical working medium compression channel is an inlet of the semi-open supercritical compression channel, the maximum cross section of the semi-open supercritical working medium compression channel is an outlet of the semi-open supercritical working medium compression channel, the non-through channel inlet and the non-through channel outlet of the non-through channel 11 are arranged on the non-through channel end face of the non-through channel 9, the non-through channel end face of the non-through channel is the non-through channel 7 and the non-through channel end face of the non-through channel 11 is arranged on the non-through channel end face of the non-flow channel 7; the dry gas storage tank 15 is connected with the dry gas seal 5 through a dry gas seal pipeline 16, the dry gas seal 5, the comb teeth seal 6 and a compressor semi-open impeller of the variable flow partial air inlet supercritical working medium semi-open centrifugal compressor 17 are sequentially positioned on the main shaft 2, and the dry gas seal 5 is close to the second main shaft support 3-2.
As a preferred embodiment of the present invention, the number of through-flow channels 11 of the variable flow partial-intake supercritical working medium semi-open centrifugal compressor 17 is an even number greater than or equal to 2, and the two through-flow channels 11 opposite to each other are of a spatial center-symmetrical structure with the main shaft center line as the center line.
As a preferred embodiment of the present invention, the variable flow partial intake supercritical working medium semi-open centrifugal compressor 17 adjusts the number of through-flow channels 11 by increasing or decreasing the number of non-through-flow channel inlet baffles 12 and non-through-flow channel outlet baffles 14 of the supercritical working medium compression channels in pairs, and the two through-flow channels 11 with opposite positions after the adjustment are still in a central symmetrical structure with the central line of the main shaft as the central line.
As a preferred embodiment of the present invention, the air inlet mode of the variable flow partial air inlet supercritical working medium semi-open centrifugal compressor 17 is axial air inlet and radial air outlet.
As a preferred embodiment of the invention, the motor has 2 or more pole pairs, capable of operating at 1 or more rotational speeds.
As a preferred embodiment of the present invention, the variable flow partial-intake supercritical working medium semi-open centrifugal compressor 17 adopts one or more sections of comb teeth seals 6 to control internal leakage, at least one section of comb teeth seal 6 is arranged on the main shaft 2, and the rest of comb teeth seals 6 are selectively arranged at any gap between the semi-open impeller of the compressor and the compressor housing 7.
The working method of the variable-flow supercritical working medium semi-open centrifugal compression device mainly comprises three processes, namely a preparation stage, an operation stage and a shutdown stage, wherein the preparation stage supplies lubricating oil to a first main shaft support 3-1 and a second main shaft support 3-2 by an oil supply system, and high-pressure clean gas is sealed 5 by a dry gas storage tank 15 through a dry gas sealing pipeline 16; after the operation is ready, the motor 4 is started and quickly rises to the designed rotating speed, the supercritical working medium flowing in along the axial inlet of the compressor shell 7 is sucked into the inlet of the through flow channel 11 of the compressor semi-open impeller with central symmetry, is diffused to the through flow channel outlet 9 along the expanding through flow channel 11 at a rising speed, then enters the static blade 8 channel on the compressor shell 7 for deceleration and pressure rising, and then flows out of the local air inlet supercritical working medium semi-open centrifugal compressor 17 with variable flow from the radial outlet of the compressor shell 7; in the stopping stage, the motor 4 stops providing power, the variable-flow local air inlet supercritical working medium semi-open centrifugal compressor 17 is stopped rapidly, after the variable-flow local air inlet supercritical working medium semi-open centrifugal compressor 17 is stopped, the dry gas storage tank 15 stops providing high-pressure pure gas for the dry gas seal 5, and the oil supply system performs post lubrication on the first main shaft support 3-1 and the second main shaft support 3-2 for 20 minutes and stops working.
According to the design flow modifying method of the variable-flow supercritical working medium semi-open centrifugal compressor, when the variable-flow supercritical working medium semi-open centrifugal compressor is in a stop state, the compressor shell 7 is opened, the compressor semi-open impeller of the variable-flow local air inlet supercritical working medium semi-open centrifugal compressor 17 is taken out, the number of through flow channels 11 is adjusted by increasing or reducing the number of non-through flow channel inlet baffles 12 and non-through flow channel outlet baffles 14 of the supercritical working medium compression channels in pairs according to the modified design flow parameters, and after the number is adjusted, the two through flow channels 11 which are opposite in position on the compressor semi-open impeller are still of a central symmetrical structure taking the central line of a main shaft as the central line, and after the compressor semi-open impeller is put back to the position, the compressor shell 7 is closed.
Claims (6)
1. The utility model provides a supercritical working medium semi-open centrifugal compression device of variable flow which characterized in that: the device comprises a thrust bearing (1), a main shaft (2), a first main shaft support (3-1), a second main shaft support (3-2), a motor (4), a dry gas storage tank (15), a dry gas sealing pipeline (16) and a variable flow partial air inlet supercritical working medium semi-open centrifugal compressor (17), wherein the thrust bearing (1), the first main shaft support (3-1), the motor (4), the second main shaft support (3-2) and the variable flow partial air inlet supercritical working medium semi-open centrifugal compressor (17) are sequentially arranged on the main shaft (2) from one end of the main shaft (2); the variable flow partial air inlet supercritical working medium semi-open centrifugal compressor (17) is composed of a dry gas seal (5), a comb tooth seal (6), a compressor shell (7), a static blade (8), a movable blade (10), a non-through flow channel inlet baffle (12), a compressor rotating wheel (13) and a non-through flow channel outlet baffle (14), wherein the movable blade (10), the non-through flow channel inlet baffle (12) and the non-through flow channel outlet baffle (14) are arranged on the compressor rotating wheel (13), the movable blade (10), the compressor rotating wheel (13), the non-through flow channel inlet baffle (12) and the non-through flow channel outlet baffle (14) form a compressor semi-open impeller, the processing surface at one side of the movable vane (10), the bottom processing surface of the compressor rotating wheel (13) and the processing surface at one side of the adjacent movable vane form an expanded U-shaped semi-open supercritical working medium compression flow passage, the minimum section of the semi-open supercritical working medium compression flow passage is an inlet of the semi-open supercritical working medium compression flow passage, the maximum section of the semi-open supercritical working medium compression flow passage is an outlet of the semi-open supercritical working medium compression flow passage, the inlet and the outlet of the semi-open supercritical working medium compression flow passage are provided with non-through flow passage inlet baffle plates (12) and non-through flow passage outlet baffle plates (14), the inlet and the outlet of the supercritical working medium compression flow channel are provided with a non-through flow channel inlet baffle (12) and a non-through flow channel outlet baffle (14), the flow channel is a through flow channel (11), the tail end of the through flow channel (11) is a through flow channel outlet (9), and the static blade (8) is arranged on the compressor shell (7) at the outer side of the whole circumferential direction of the through flow channel outlet (9); the dry gas storage tank (15) is connected with the dry gas seal (5) through a dry gas seal pipeline (16), the dry gas seal (5), the comb tooth seal (6) and a compressor semi-open impeller of a variable flow partial air inlet supercritical working medium semi-open centrifugal compressor (17) are sequentially positioned on the main shaft (2), and the dry gas seal (5) is close to the second main shaft support (3-2);
The number of through-flow channels (11) of the variable-flow local air inlet supercritical working medium semi-open centrifugal compressor (17) is an even number greater than or equal to 2, and two through-flow channels (11) with opposite positions are of a space center symmetrical structure taking the central line of a main shaft as the central line;
The variable flow partial air inlet supercritical working medium semi-open centrifugal compressor (17) adjusts the number of through-flow channels (11) by increasing or decreasing the number of non-through-flow channel inlet baffles (12) and non-through-flow channel outlet baffles (14) of the supercritical working medium compression channels in pairs, and the two through-flow channels (11) with opposite positions after the adjustment are of a central symmetrical structure taking the central line of the main shaft as the central line.
2. The variable flow supercritical working medium semi-open centrifugal compression device according to claim 1, wherein: the air inlet mode of the variable flow partial air inlet supercritical working medium semi-open centrifugal compressor (17) is axial air inlet and radial air outlet.
3. The variable flow supercritical working medium semi-open centrifugal compression device according to claim 1, wherein: the motor has 2 or more pole pairs and is capable of operating at 1 or more rotational speeds.
4. The variable flow supercritical working medium semi-open centrifugal compression device according to claim 1, wherein: the variable flow partial air inlet supercritical working medium semi-open centrifugal compressor (17) adopts one section or a plurality of sections of comb tooth seals (6) for internal leakage control, at least one section of comb tooth seal (6) is arranged on the main shaft (2), and other comb tooth seals (6) are selectively arranged at any gap between a semi-open impeller of the compressor and a shell (7) of the compressor.
5. The working method of the variable flow supercritical working medium semi-open centrifugal compression device according to any one of claims 1 to 4, wherein the working method is characterized by comprising the following steps: the method mainly comprises three processes, namely a preparation stage, an operation stage and a shutdown stage, wherein the preparation stage supplies lubricating oil to a first main shaft support (3-1) and a second main shaft support (3-2) by an oil supply system, and high-pressure clean gas is sealed (5) by a dry gas storage tank (15) through a dry gas seal pipeline (16); after the operation is ready, the motor (4) is started and quickly rises to the designed rotating speed, supercritical working medium flowing in along the axial inlet of the compressor shell (7) is sucked into the inlet of a through flow channel (11) of the compressor semi-open impeller with central symmetry, is diffused to an outlet (9) of the through flow channel along the rising speed of the expanding through flow channel (11), then enters a static blade (8) channel on the compressor shell (7) for deceleration and pressure rising, and then flows out of a local air inlet supercritical working medium semi-open centrifugal compressor (17) with variable flow from the radial outlet of the compressor shell (7); in the shutdown stage, the motor (4) stops providing power, the variable-flow partial-air-inlet supercritical working medium semi-open centrifugal compressor (17) is quickly stopped, after the variable-flow partial-air-inlet supercritical working medium semi-open centrifugal compressor (17) is stopped, the dry gas storage tank (15) stops purifying gas under high pressure of the dry gas seal (5), and the oil supply system supplies lubricating oil to the first main shaft support (3-1) and the second main shaft support (3-2) for 20 minutes and then stops working.
6. A method for modifying design flow rate of a variable flow rate supercritical working medium semi-open centrifugal compression device according to any one of claims 1 to 4, characterized by: when the supercritical working medium semi-open centrifugal compression device with variable flow is in a stop state, a compressor shell (7) is opened, a compressor semi-open impeller of a local air inlet supercritical working medium semi-open centrifugal compressor (17) with variable flow is taken out, the number of through flow channels (11) is adjusted by increasing or reducing the number of non-through flow channel inlet baffles (12) and non-through flow channel outlet baffles (14) of a supercritical working medium compression channel in pairs according to corrected design flow parameters, and after the number is adjusted, the two through flow channels (11) which are opposite in position on the compressor semi-open impeller are still in a central symmetrical structure taking the central line of a main shaft as the central line, and the compressor shell (7) is closed after the compressor semi-open impeller is replaced.
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