CN108612570B - Supercritical carbon dioxide impeller mechanical working medium replacement device and method adopting dry gas seal - Google Patents
Supercritical carbon dioxide impeller mechanical working medium replacement device and method adopting dry gas seal Download PDFInfo
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- CN108612570B CN108612570B CN201810674210.7A CN201810674210A CN108612570B CN 108612570 B CN108612570 B CN 108612570B CN 201810674210 A CN201810674210 A CN 201810674210A CN 108612570 B CN108612570 B CN 108612570B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 242
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 121
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 47
- 230000001502 supplementing effect Effects 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 230000003068 static effect Effects 0.000 claims abstract description 9
- 238000004891 communication Methods 0.000 claims description 30
- 239000012535 impurity Substances 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 3
- 238000011549 displacement method Methods 0.000 claims 3
- 239000012530 fluid Substances 0.000 claims 3
- 238000005516 engineering process Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
- F01D11/06—Control thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing and a method thereof, wherein the device comprises an impeller mechanical stator, a main shaft, a dry gas sealing, a static blade, a movable blade, a supporting bearing, an inlet section pipeline, an outlet section pipeline, a suction pipeline, a shutoff valve, a vacuum pump, an accident working condition emptying pipeline, a high-purity carbon dioxide gas source, a dry gas sealing pipeline, a main air supplementing pipeline and a valve regulating valve.
Description
Technical Field
The invention relates to the technical field of supercritical carbon dioxide impeller mechanical working medium replacement, in particular to a supercritical carbon dioxide impeller mechanical working medium replacement device and method adopting dry gas sealing.
Background
The supercritical carbon dioxide system has higher requirement on the purity of carbon dioxide, which is generally more than 99.9%, so that before the critical carbon dioxide compressor and the supercritical carbon dioxide turbine equipment run, the air in the equipment needs to be replaced by high-purity carbon dioxide, so that the air in the supercritical carbon dioxide impeller mechanical equipment is prevented from entering a circulating system, and the concentration of high-purity carbon dioxide working medium in the system is reduced. The minimum pressure in the supercritical carbon dioxide system is higher than the critical pressure of 7.39MPa, so that the supercritical carbon dioxide impeller mechanical equipment comprises a supercritical carbon dioxide compressor and supercritical carbon dioxide permeation average normal working internal pressure of at least 7.39MPa, and the most effective measure is to adopt a shaft end dry gas sealing technology, and the dry gas seal has strict use specifications and needs to prevent the dry gas seal from being in static large negative pressure countercurrent and entering impurity damage in order to prevent the carbon dioxide working medium from leaking outwards. Therefore, the following three problems exist in the process of replacing the high-purity working medium by supercritical carbon dioxide impeller mechanical equipment: 1. the supercritical carbon dioxide impeller mechanical equipment has dead angles, vortex is formed at the dead angles when the air flows in and out of the equipment, air is not easy to flow out of the dead angles, and the required working medium purity cannot be effectively achieved; 2. working medium replacement of supercritical carbon dioxide impeller mechanical equipment is needed to build a working medium replacement device on the basis of the working medium replacement; 3. in the process of replacing working medium of supercritical carbon dioxide impeller mechanical equipment, how to protect the dry gas seal from being influenced. The prior art is not seen to provide an effective solution to the above problems.
Disclosure of Invention
The invention aims to solve the problems and provide a high-purity working medium replacement device and a high-purity working medium replacement method for supercritical carbon dioxide impeller machinery by adopting a shaft end dry gas sealing technology.
The invention realizes the above purpose through the following technical scheme:
The supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing comprises a supercritical carbon dioxide impeller mechanical stator 1, a supercritical carbon dioxide impeller mechanical main shaft 2, a dry gas sealing 3, a static blade 4, a movable blade 5, a support bearing 6, an inlet section pipeline 7, an inlet section pipeline valve 8, an outlet section pipeline 9, an outlet section pipeline valve 10, a suction pipeline 11, a suction pipeline shutoff valve 12, a vacuum pump 13, an accident working condition evacuation pipeline 19, an accident working condition evacuation pipeline shutoff valve 20, a high-purity carbon dioxide gas source 14, a high-pressure end dry gas seal pipeline 15, a low-pressure end dry gas seal pipeline 16, a main air supplementing pipeline 21, a high-pressure end dry gas seal pipeline valve 17, a low-pressure end dry gas seal pipeline valve 18 and a main air supplementing pipeline valve 22; wherein, the inlet section pipeline 7 can also be used as an outlet section pipeline, the outlet section pipeline 9 can also be used as an inlet section pipeline, the inlet section pipeline valve 8 can also be used as an outlet section pipeline valve, and the outlet section pipeline valve 10 can also be used as an inlet section pipeline valve; the inlet section pipeline 7 and the outlet section pipeline 9 are connected with the supercritical carbon dioxide impeller mechanical stator 1, the inlet section pipeline valve 8 is positioned on the inlet section pipeline 7, the outlet section pipeline valve 10 is positioned on the outlet section pipeline 9, two support bearings 6 are respectively arranged at two ends of the supercritical carbon dioxide impeller mechanical spindle 2, the stator blade 4 is connected with the supercritical carbon dioxide impeller mechanical stator 1, the movable blade 5 is connected with the supercritical carbon dioxide impeller mechanical spindle 2, the dry gas seal 3 is arranged on the inner sides of the two support bearings 6 and the stator blade 4 and the outer sides of the movable blade 5, the dry gas seal 3 is divided into a high-pressure side dry gas seal and a low-pressure side dry gas seal, the high-pressure side dry gas seal and the low-pressure side dry gas seal are respectively connected with a high-purity carbon dioxide gas source 14 through a high-pressure side dry gas seal pipeline 15 and a low-pressure side dry gas seal pipeline 16, a high-pressure side dry gas seal valve 17 and a low-pressure side dry gas seal pipeline 18 are respectively arranged on the high-pressure side dry gas seal pipeline 15 and the low-pressure side dry gas seal pipeline 16, a suction pipeline 11 is arranged on the upper stream of the inlet section pipeline 9 and the outlet section pipeline 9, a suction pipeline 11 is arranged on the suction pipeline 11 and the upper stream of the suction pipeline 11 and the suction pipeline 19, a main air supply pipeline is arranged on the upper stream of the suction pipeline 11 and the suction pipeline 19 is arranged on the suction pipeline and the upper stream of the main pipeline 11 and the suction pipeline 11 and the main pipeline is arranged on the upper stream of the suction pipeline and the main pipeline and the suction pipeline 11 and the main pipeline 20.
The high-purity carbon dioxide gas source 14 is provided with a normally closed connector of a high-purity carbon dioxide working medium storage tank which has a high pressure grade with the outside and the concentration of not less than 99.9 percent, and when the air pressure of the high-purity carbon dioxide gas source 14 is lower than a set value, the high-purity carbon dioxide working medium is supplemented from the high-purity carbon dioxide working medium storage tank which adopts the high pressure grade outside the supercritical carbon dioxide impeller mechanical working medium replacement device sealed by dry gas by opening the normally closed connector.
The outlet of the other end of the accident condition emptying pipeline 19 outside the accident condition emptying pipeline shutoff valve 20 is arranged outside a factory building where the supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing is located.
The working medium replacement method of the supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing comprises the following steps:
Step 1, after a supercritical carbon dioxide circulating system issues a working medium replacement command to a supercritical carbon dioxide impeller machine, setting an inlet section pipeline valve 8, an outlet section pipeline valve 10 and an accident condition emptying pipeline shutoff valve 20 to be in a long-closing state;
Step 2, closing a high-pressure end dry gas seal pipeline regulating valve 17, a low-pressure end dry gas seal pipeline regulating valve 18 and a main gas supplementing pipeline regulating valve 22, opening a suction pipeline shutoff valve 12, and exhausting gas in a supercritical carbon dioxide impeller machine and a communication space of an inlet pipeline and an outlet pipeline by a vacuum pump 13 until the air pressure in the communication space reaches a certain set pressure P, and closing the suction pipeline shutoff valve 12 and the vacuum pump 13;
Step 3, opening a high-pressure end dry gas seal pipeline regulating valve 17, a low-pressure end dry gas seal pipeline regulating valve 18 and a main air supplementing pipeline regulating valve 22, wherein the high-purity carbon dioxide gas source 14 supplements air in the supercritical carbon dioxide impeller machinery and the communication space of the inlet and outlet pipelines through a main air supplementing pipeline 21, a high-pressure end dry gas seal pipeline 15 and a low-pressure end dry gas seal pipeline 16 until the air pressure in the communication space reaches atmospheric pressure P0, and closing the high-pressure end dry gas seal pipeline regulating valve 17, the low-pressure end dry gas seal pipeline regulating valve 18 and the main air supplementing pipeline regulating valve 22;
Step 4, keeping the high-pressure end dry gas seal pipeline regulating valve 17, the low-pressure end dry gas seal pipeline regulating valve 18, the main gas supplementing pipeline regulating valve 22 and the suction pipeline shutoff valve 12 in a closed state, so that the standing time of the communication space inside the supercritical carbon dioxide impeller machine and the communication space of the inlet and outlet pipelines reaches a set fixed time T, and impurity gas molecules are diffused among carbon dioxide gas molecules;
and 5, repeating the operations from the step 2 to the step 4 for a set number of times N, so that the concentration of the communication space inside the supercritical carbon dioxide impeller machine and the inlet and outlet pipelines reaches the purity C required by the system.
When the supercritical carbon dioxide impeller machine is used for exhausting gas in the interior of the supercritical carbon dioxide impeller machine and the communication space of the inlet and outlet pipelines, the difference between the atmospheric pressure P0 and the set pressure P in the communication space is smaller than the maximum negative pressure which can be born when the dry gas seal 3 is static.
The set times N, the set pressure P, the system required purity C and the atmospheric pressure P0 of the supercritical carbon dioxide impeller mechanical working medium suction meet the calculation formula 73.9- (P/P0) N to be more than or equal to 73.9C.
The fixed time T for standing and setting the communication space of the inlet and outlet pipelines in the supercritical carbon dioxide impeller machine is 2 to 5 minutes.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a high-purity working medium replacement device and a high-purity working medium replacement method for supercritical carbon dioxide impeller mechanical equipment by adopting a shaft end dry gas sealing technology. In this sense, the invention solves the technical problem of high-purity working medium replacement of supercritical carbon dioxide impeller machinery equipment by adopting the shaft end dry gas sealing technology, ensures that the purity of the working medium in the supercritical carbon dioxide impeller machinery equipment can reach 99.9%, and can ensure that the dry gas seal is not damaged in the working medium replacement process.
Drawings
FIG. 1 is a schematic diagram of a supercritical carbon dioxide impeller mechanical working medium displacement device employing dry gas sealing in accordance with the present invention.
1 Is a supercritical carbon dioxide impeller mechanical stator; 2 is a supercritical carbon dioxide impeller mechanical main shaft; 3 is dry gas sealing; 4 is a static blade; 5 is a movable blade; 6 is a support bearing; 7 is an inlet section pipeline; 8 is an inlet section pipeline valve; 9 is an outlet section pipeline; 10 is an outlet section pipeline valve; 11 is a suction pipeline; 12 is a suction line shut-off valve; 13 is a vacuum pump; 14 is a high purity carbon dioxide gas source; 15 is a high-pressure end dry gas seal pipeline; 16 is a low-pressure end dry gas seal pipeline; 17 is a high-pressure end dry gas seal pipeline valve; 18 is a low-pressure end dry gas seal pipeline valve; 19 is an accident condition evacuation pipeline; 20 is an accident condition emptying pipeline shutoff valve; 21 is a main air supplementing pipeline; and 22 is a main air supplementing pipeline valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
As shown in fig. 1, the supercritical carbon dioxide impeller machine working medium replacement device adopting dry gas sealing comprises a supercritical carbon dioxide impeller machine stator 1, a supercritical carbon dioxide impeller machine spindle 2, a dry gas sealing 3, a static blade 4, a movable blade 5, a support bearing 6, an inlet section pipeline 7, an inlet section pipeline valve 8, an outlet section pipeline 9, an outlet section pipeline valve 10, a suction pipeline 11, a suction pipeline shutoff valve 12, a vacuum pump 13, an accident condition evacuation pipeline 19, an accident condition evacuation pipeline shutoff valve 20, a high-purity carbon dioxide gas source 14, a high-pressure end dry gas seal pipeline 15, a low-pressure end dry gas seal pipeline 16, a main air supplementing pipeline 21, a high-pressure end dry gas seal pipeline valve 17, a low-pressure end dry gas seal pipeline valve 18 and a main air supplementing pipeline valve 22; wherein, the inlet section pipeline 7 can also be used as an outlet section pipeline, the outlet section pipeline 9 can also be used as an inlet section pipeline, the inlet section pipeline valve 8 can also be used as an outlet section pipeline valve, and the outlet section pipeline valve 10 can also be used as an inlet section pipeline valve; the inlet section pipeline 7 and the outlet section pipeline 9 are both connected with the supercritical carbon dioxide impeller mechanical stator 1, the inlet section pipeline valve 8 is positioned on the inlet section pipeline 7, the outlet section pipeline 10 is positioned on the outlet section pipeline 9, two support bearings 6 are respectively arranged at two ends of the supercritical carbon dioxide impeller mechanical spindle 2, the stator blade 4 is connected with the supercritical carbon dioxide impeller mechanical stator 1, the movable blade 5 is connected with the supercritical carbon dioxide impeller mechanical spindle 2, the dry gas seal 3 is arranged at the inner sides of the two support bearings 6 and the outer sides of the stator blade 4 and the movable blade 5, the dry gas seal 3 is divided into a high-pressure side dry gas seal and a low-pressure side dry gas seal, the high-pressure side dry gas seal and the low-pressure side dry gas seal are respectively connected with a high-purity carbon dioxide gas source 14 through a high-pressure end dry gas seal pipeline 15 and a low-pressure end dry gas seal pipeline 16, the high-pressure end dry gas seal pipeline 15 and the low-pressure end dry gas seal pipeline 16 are respectively provided with a high-pressure end dry gas seal pipeline regulating valve 17 and a low-pressure end dry gas seal pipeline regulating valve 18, a suction pipeline 11 is arranged on the outlet section pipeline 9 and upstream or downstream of the outlet section pipeline 10, a suction pipeline shutoff valve 12 is arranged on the suction pipeline 11, a vacuum pump 13 is arranged downstream of the suction pipeline shutoff valve 12, an accident condition emptying pipeline 19 is arranged on the suction pipeline 11 and upstream of the suction pipeline shutoff valve 12, an accident condition emptying pipeline shutoff valve 20 is arranged on the accident condition emptying pipeline 19, a main air supplementing pipeline 21 is arranged on the suction pipeline 11 and upstream of the accident condition emptying pipeline 19, the other end of the main air supplementing pipeline 21 is communicated with a high-purity carbon dioxide air source 14, and a main air supplementing pipeline regulating valve 22 is arranged on the main air supplementing pipeline 21.
As a preferred embodiment of the present invention, the high purity carbon dioxide gas source 14 has a normally closed connection port of a high purity carbon dioxide working medium storage tank with a high pressure level with the outside and a concentration not lower than 99.9%, and when the gas pressure of the high purity carbon dioxide gas source 14 is lower than a certain set value, the high purity carbon dioxide working medium can be replenished from the high purity carbon dioxide working medium storage tank with a high pressure level outside the supercritical carbon dioxide impeller mechanical working medium replacement device using dry gas sealing by opening the normally closed connection port.
As a preferred embodiment of the invention, the outlet of the other end of the accident condition evacuation pipeline 19 outside the accident condition evacuation pipeline shutoff valve 20 is arranged outside the factory building where the supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing is located.
The invention relates to a working medium replacement method of a supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing, which comprises the following steps:
Step 1, after a supercritical carbon dioxide circulating system issues a working medium replacement command to a supercritical carbon dioxide impeller machine, setting an inlet section pipeline valve 8, an outlet section pipeline valve 10 and an accident condition emptying pipeline shutoff valve 20 to be in a long-closing state;
Step 2, closing a high-pressure end dry gas seal pipeline regulating valve 17, a low-pressure end dry gas seal pipeline regulating valve 18 and a main gas supplementing pipeline regulating valve 22, opening a suction pipeline shutoff valve 12, and exhausting gas in a supercritical carbon dioxide impeller machine and a communication space of an inlet pipeline and an outlet pipeline by a vacuum pump 13 until the air pressure in the communication space reaches a certain set pressure P, and closing the suction pipeline shutoff valve 12 and the vacuum pump 13;
Step 3, opening a high-pressure end dry gas seal pipeline regulating valve 17, a low-pressure end dry gas seal pipeline regulating valve 18 and a main air supplementing pipeline regulating valve 22, wherein the high-purity carbon dioxide gas source 14 supplements air in the supercritical carbon dioxide impeller machinery and the communication space of the inlet and outlet pipelines through a main air supplementing pipeline 21, a high-pressure end dry gas seal pipeline 15 and a low-pressure end dry gas seal pipeline 16 until the air pressure in the communication space reaches atmospheric pressure P0, and closing the high-pressure end dry gas seal pipeline regulating valve 17, the low-pressure end dry gas seal pipeline regulating valve 18 and the main air supplementing pipeline regulating valve 22;
Step 4, keeping the high-pressure end dry gas seal pipeline regulating valve 17, the low-pressure end dry gas seal pipeline regulating valve 18, the main gas supplementing pipeline regulating valve 22 and the suction pipeline shutoff valve 12 in a closed state, so that the standing time of the communication space inside the supercritical carbon dioxide impeller machine and the communication space of the inlet and outlet pipelines reaches a set fixed time T, and impurity gas molecules are diffused among carbon dioxide gas molecules;
and 5, repeating the operations from the step 2 to the step 4 for a set number of times N, so that the concentration of the communication space inside the supercritical carbon dioxide impeller machine and the inlet and outlet pipelines reaches the purity C required by the system.
As a preferred embodiment of the present invention, when the supercritical carbon dioxide impeller machine is pumping gas from the interior of the supercritical carbon dioxide impeller machine and the communication space of the inlet and outlet pipes, the difference between the atmospheric pressure P0 and the set pressure P in the communication space is smaller than the maximum negative pressure that can be sustained when the dry gas seal 3 is static.
As the preferable implementation mode of the invention, the set times N, the set pressure P, the system required purity C and the atmospheric pressure P0 of the pumping of the supercritical carbon dioxide impeller mechanical working medium meet the calculation formula 73.9- (P/P0) N is more than or equal to 73.9C.
In a preferred embodiment of the present invention, the fixed time T set for the communication space between the inside of the supercritical carbon dioxide impeller machine and the inlet and outlet pipes is 2 to 5 minutes.
The technical scheme of the invention is not limited to the specific embodiment, and all technical modifications made according to the technical scheme of the invention fall within the protection scope of the invention.
Claims (7)
1. The supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing is characterized in that: the device comprises a supercritical carbon dioxide impeller machine stator (1), a supercritical carbon dioxide impeller machine spindle (2), a dry gas seal (3), a static blade (4), a movable blade (5), a support bearing (6), an inlet section pipeline (7), an inlet section pipeline valve (8), an outlet section pipeline (9), an outlet section pipeline valve (10), a suction pipeline (11), a suction pipeline shut-off valve (12), a vacuum pump (13), an accident condition evacuation pipeline (19), an accident condition evacuation pipeline shut-off valve (20), a high-purity carbon dioxide gas source (14), a high-pressure end dry gas seal pipeline (15), a low-pressure end dry gas seal pipeline (16), a main gas supplementing pipeline (21), a high-pressure end dry gas seal pipeline regulating valve (17), a low-pressure end dry gas seal pipeline regulating valve (18) and a main gas supplementing pipeline regulating valve (22); the inlet section pipeline (7) can also be used as an outlet section pipeline, the outlet section pipeline (9) can also be used as an inlet section pipeline, the inlet section pipeline valve (8) can also be used as an outlet section pipeline valve, and the outlet section pipeline valve (10) can also be used as an inlet section pipeline valve; the inlet section pipeline (7) and the outlet section pipeline (9) are connected with a supercritical carbon dioxide impeller mechanical stator (1), an inlet section pipeline valve (8) is positioned on the inlet section pipeline (7), an outlet section pipeline valve (10) is positioned on the outlet section pipeline (9), two support bearings (6) are respectively arranged at two ends of a supercritical carbon dioxide impeller mechanical spindle (2), the stator blade (4) is connected with the supercritical carbon dioxide impeller mechanical stator (1), the movable vane (5) is connected with the supercritical carbon dioxide impeller mechanical spindle (2), a dry gas seal (3) is arranged at the inner sides of the two support bearings (6) and the stator blade (4) and the outer sides of the movable vane (5), the dry gas seal (3) is divided into a high-pressure side dry gas seal and a low-pressure side dry gas seal, the high-pressure side dry gas seal and the low-pressure side dry gas seal are respectively connected with a high-purity carbon dioxide gas source (14) through a high-pressure side dry gas seal pipeline (15) and a low-pressure side dry gas seal pipeline (16), the high-pressure side dry gas seal pipeline (15) and the low-pressure side dry gas pipeline (16) are respectively provided with a high-pressure regulating valve (18) at the upstream of the high-pressure side dry gas seal pipeline (15) and the low-pressure side dry gas pipeline (16), the high-pressure side dry gas pipeline (16) is respectively provided with a high-pressure regulating valve pipeline (17) and the high-pressure regulating pipeline (18), be provided with suction line shut-off valve (12) on suction line (11), be provided with vacuum pump (13) at suction line shut-off valve (12) low reaches, be provided with accident operating mode evacuation pipeline (19) on suction line (11) and suction line shut-off valve (12) the upper reaches, be provided with accident operating mode evacuation pipeline shut-off valve (20) on accident operating mode evacuation pipeline (19), be provided with main air supplementing pipeline (21) on suction line (11) and accident operating mode evacuation pipeline (19) the upper reaches, the other end and the high purity carbon dioxide air source (14) of main air supplementing pipeline (21) communicate, be provided with main air supplementing pipeline regulating valve (22) on main air supplementing pipeline (21).
2. The supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing according to claim 1, wherein the device is characterized in that: the high-purity carbon dioxide gas source (14) is provided with a normally closed connector of a high-purity carbon dioxide working medium storage tank which has a high pressure grade with the outside and has a concentration of not less than 99.9 percent, and when the air pressure of the high-purity carbon dioxide gas source (14) is lower than a set value, the high-purity carbon dioxide working medium is supplemented from the high-purity carbon dioxide working medium storage tank which adopts the high pressure grade outside the dry gas sealed supercritical carbon dioxide impeller mechanical working medium replacement device by opening the normally closed connector.
3. The supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing according to claim 1, wherein the device is characterized in that: the outlet of the other end of the accident working condition emptying pipeline (19) at the outer side of the accident working condition emptying pipeline shutoff valve (20) is arranged at the outer side of a factory building where the supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing is located.
4. A working medium replacement method of a supercritical carbon dioxide impeller mechanical working medium replacement device adopting dry gas sealing according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
step 1, after a supercritical carbon dioxide circulating system issues a working medium replacement command to a supercritical carbon dioxide impeller machine, an inlet section pipeline valve (8), an outlet section pipeline valve (10) and an accident condition emptying pipeline shutoff valve (20) are set to be in a long-closing state;
Step 2, closing a high-pressure end dry gas seal pipeline regulating valve (17), a low-pressure end dry gas seal pipeline regulating valve (18) and a main gas supplementing pipeline regulating valve (22), opening a suction pipeline shutoff valve (12), and exhausting gas in a supercritical carbon dioxide impeller machine and a communication space of an inlet pipeline and an outlet pipeline by a vacuum pump (13) until the air pressure in the communication space reaches a certain set pressure P, and closing the suction pipeline shutoff valve (12) and the vacuum pump (13);
Step 3, opening a high-pressure end dry gas seal pipeline regulating valve (17), a low-pressure end dry gas seal pipeline regulating valve (18) and a main air supplementing pipeline regulating valve (22), wherein a high-purity carbon dioxide gas source (14) supplements air to the inside of the supercritical carbon dioxide impeller machinery and the communication space of an inlet pipeline and an outlet pipeline through a main air supplementing pipeline (21), a high-pressure end dry gas seal pipeline (15) and a low-pressure end dry gas seal pipeline (16), and closing the high-pressure end dry gas seal pipeline regulating valve (17), the low-pressure end dry gas seal pipeline regulating valve (18) and the main air supplementing pipeline regulating valve (22) until the air pressure in the communication space reaches the atmospheric pressure P0;
Step 4, keeping a high-pressure end dry gas seal pipeline regulating valve (17), a low-pressure end dry gas seal pipeline regulating valve (18), a main air supplementing pipeline regulating valve (22) and a suction pipeline shutoff valve (12) in a closed state, so that the standing time of the communication space inside the supercritical carbon dioxide impeller machine and the communication space of the inlet and outlet pipelines reaches a set fixed time T, and impurity gas molecules are diffused among carbon dioxide gas molecules;
and 5, repeating the operations from the step 2 to the step 4 for a set number of times N, so that the concentration of the communication space inside the supercritical carbon dioxide impeller machine and the inlet and outlet pipelines reaches the purity C required by the system.
5. The working fluid displacement method of claim 4, wherein: when the supercritical carbon dioxide impeller machine is used for exhausting gas in the interior of the supercritical carbon dioxide impeller machine and the communication space of the inlet and outlet pipelines, the difference between the atmospheric pressure P0 and the set pressure P in the communication space is smaller than the maximum negative pressure which can be born when the dry gas seal (3) is static.
6. The working fluid displacement method of claim 4, wherein: the set times N, the set pressure P, the system required purity C and the atmospheric pressure P0 of the supercritical carbon dioxide impeller mechanical working medium suction meet the calculation formula 73.9- (P/P0) N to be more than or equal to 73.9C.
7. The working fluid displacement method of claim 4, wherein: the fixed time T for standing and setting the communication space of the inlet and outlet pipelines in the supercritical carbon dioxide impeller machine is 2 to 5 minutes.
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| CN201810674210.7A CN108612570B (en) | 2018-06-27 | 2018-06-27 | Supercritical carbon dioxide impeller mechanical working medium replacement device and method adopting dry gas seal |
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