CN116066743A - Nitrogen displacement system and method for hydrogen diaphragm compressor - Google Patents
Nitrogen displacement system and method for hydrogen diaphragm compressor Download PDFInfo
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- CN116066743A CN116066743A CN202310163832.4A CN202310163832A CN116066743A CN 116066743 A CN116066743 A CN 116066743A CN 202310163832 A CN202310163832 A CN 202310163832A CN 116066743 A CN116066743 A CN 116066743A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pipeline Systems (AREA)
Abstract
A nitrogen replacement system and method of a hydrogen diaphragm compressor, when the system automatically and normally operates, a first second end of an automatic valve and a seventh second end of the automatic valve are kept in a normally open state; the second end of the automatic valve II is kept in a normally closed state; when an emergency stop condition occurs, the PLC controls the first end of the automatic valve I, the first end of the automatic valve seven to be opened and the second end of the automatic valve I and the second end of the automatic valve seven to be closed in a linkage manner, so that the hydrogen inlet and the hydrogen outlet are closed, and meanwhile, the first end of the automatic valve II is opened and the second end of the automatic valve II is opened in a linkage manner, so that nitrogen for replacement purging enters the hydrogen compression system; and when the replacement purging is performed, the PLC controls the first end of the automatic valve six to be opened and the second end of the automatic valve six to be opened in a linkage manner, and hydrogen in the hydrogen compression system is discharged into the emptying system through the second end of the automatic valve six. The invention increases the automatic replacement capability, and the time required by manual action is shortened by the control of the PLC between the hydrogen compression system and the equipment, thereby improving the overall safety.
Description
Technical Field
The invention belongs to the technical field of hydrogen stations, and particularly relates to a nitrogen replacement system and method of a hydrogen diaphragm compressor.
Background
As shown in fig. 1, the flow of the hydrogen diaphragm compressor system in the prior art is as follows: hydrogen enters the compressor system from a TP1 port, at the moment, the inlet manual valve BV1 and the outlet manual valve BV4 are in a normally open state, the hydrogen is compressed by the compressor after entering the manual valve BV1, the hydrogen is filtered by the filter to remove impurities, and finally the hydrogen is discharged from the compressor system from a TP2 port through the outlet manual valve BV4 to enter next-stage equipment.
The manual nitrogen replacement system flow is as follows: nitrogen enters the nitrogen replacement system from a TP3 port, passes through a manual valve BV7, is stabilized by a pressure stabilizing device PRV2, and then enters the compressor system to carry out purging replacement on the compressor system.
When the compressor system is shut down for maintenance or an emergency shutdown occurs, the inlet manual valve BV1 and the outlet manual valve BV4 are manually closed, and the nitrogen inlet manual valve BV7 is opened; nitrogen substitution system manual valves BV9, BV10; the compressor system manually empties the valve BV6. The nitrogen enters a compressor system to carry out purging replacement on the system, and residual hydrogen in the system is discharged into a bleeding system through a manual bleeding valve BV6. After the hydrogen in the compressor system is replaced, BV6 is manually closed, and a manual venting valve BV12 of the nitrogen replacement system is opened to replace the mixed gas in the system with nitrogen. After the replacement process is finished, the manual valve BV7 is closed, and the manual emptying valve BV11 is opened to discharge the nitrogen in the nitrogen replacement system into the bleeding system. The check valves CV3 and CV4 are arranged on the pipeline of the nitrogen replacement system to prevent the internal gas of the hydrogen and the diffusion system from reversely flowing into the nitrogen replacement system.
In the prior art, when a compressor system is stopped or an emergency occurs, the whole process needs to manually participate in the replacement of nitrogen. From the aspect of the material characteristics of hydrogen, the system device under the high-pressure hydrogen environment is manually operated, and once accidents occur, the system device can cause great injury to operators. If the leakage, combustion and other emergency situations of hydrogen occur, the condition that the treatment is not timely is easy to occur due to the artificial participation of the purging and replacement of the nitrogen, so that the optimal time for the subsequent treatment is delayed, and immeasurable loss is caused.
Disclosure of Invention
In order to solve the above problems of the prior art, the present invention provides a nitrogen displacement system and method for a hydrogen diaphragm compressor.
The technical scheme of the invention is as follows:
a hydrogen membrane compressor nitrogen displacement system, comprising:
the first pipeline sequentially comprises a hydrogen inlet, a second end of the automatic valve, a first tee joint and a compressor;
a second pipeline, which comprises a compressor, a third tee joint, a seventh second end of the automatic valve and a hydrogen outlet in turn,
the first tee joint is also connected with a third pipeline, the other end of the third pipeline is connected with a nitrogen inlet, a second tee joint and an automatic valve second end are sequentially arranged between the nitrogen inlet and the first tee joint,
the second tee joint is also connected with a fourth pipeline, the fourth pipeline comprises a first end of an automatic valve I, a second first end of the automatic valve II, a sixth first end of the automatic valve and a seventh first end of the automatic valve which are respectively connected in parallel,
the third tee joint is connected with the sixth second end of the automatic valve and the emptying system;
the first end and the second end of each automatic valve are mutually communicated and respectively controlled by a PLC (programmable logic controller) in a linkage way.
Preferably, a hydrogen concentration detection device connected with the PLC is arranged in the equipment room.
Preferably, a first manual valve is arranged between the first end of the automatic valve and the first tee joint, a fourth manual valve is arranged between the third tee joint and the seventh second end of the automatic valve, the third pipeline comprises a tenth manual valve connected with the second end of the automatic valve in parallel, a fifth tee joint and a sixth tee joint are respectively arranged on the two sides of the tenth manual valve, the fifth tee joint is connected with the eleventh manual valve and the bleeding system, the sixth tee joint is connected with the twelve manual valves and the bleeding system, the second pipeline comprises a fourth tee joint, and the fourth tee joint is connected with the sixth manual valve and the bleeding system.
A nitrogen replacement method of a hydrogen diaphragm compressor is characterized in that the nitrogen replacement system of the hydrogen diaphragm compressor is adopted,
when the system automatically and normally operates, hydrogen enters the system from the hydrogen inlet and flows out of the system from the hydrogen outlet, and the first second end of the automatic valve and the seventh second end of the automatic valve are kept in a normally open state; the second end of the automatic valve II is kept in a normally closed state;
when an emergency stop condition occurs, the PLC controls the first end of the automatic valve I, the first end of the automatic valve seven to be opened and the second end of the automatic valve I and the second end of the automatic valve seven to be closed in a linkage manner, so that the hydrogen inlet and the hydrogen outlet are closed, and meanwhile, the first end of the automatic valve II is opened and the second end of the automatic valve II is opened in a linkage manner, so that nitrogen for replacement purging enters the hydrogen compression system; and when the replacement purging is performed, the PLC controls the first end of the automatic valve six to be opened and the second end of the automatic valve six to be opened in a linkage manner, and hydrogen in the hydrogen compression system is discharged into the emptying system through the second end of the automatic valve six.
A nitrogen displacement method of a hydrogen diaphragm compressor is characterized in that the nitrogen displacement system of the hydrogen diaphragm compressor is adopted,
when the system automatically and normally operates, hydrogen enters the system from the hydrogen inlet and flows out of the system from the hydrogen outlet, and the first second end of the automatic valve, the seventh second end of the automatic valve, the first manual valve and the fourth manual valve are kept in a normally open state; the second end of the automatic valve II and the manual valve II are kept in a normally closed state;
when an emergency stop condition occurs, the PLC controls the first end of the automatic valve I, the first end of the automatic valve seven to be opened and the second end of the automatic valve I and the second end of the automatic valve seven to be closed in a linkage manner, so that the hydrogen inlet and the hydrogen outlet are closed, and meanwhile, the first end of the automatic valve II is opened and the second end of the automatic valve II is opened in a linkage manner, so that nitrogen for replacement purging enters the hydrogen compression system; when the replacement purging is performed, the PLC controls the first end of the automatic valve six to be opened and the second end of the automatic valve six to be opened in a linkage way, and hydrogen in the hydrogen compression system is discharged into the emptying system through the second end of the automatic valve six;
when the maintenance is stopped at daily, the manual valve I and the manual valve IV are manually closed, and at the moment, the inlet and the outlet of the hydrogen compression system are closed. And opening a manual valve ten to enable nitrogen to enter the hydrogen compression system, opening a manual valve six to enable hydrogen inside the hydrogen compression system to enter the emission system, closing the manual valve six after replacement is completed, opening a manual valve eleven and a manual valve twelve, and discharging residual nitrogen and hydrogen inside the nitrogen replacement system into the emission system.
The invention has the following beneficial effects:
the automatic replacement system of the invention can maintain the manual capacity, and simultaneously increases the automatic replacement capacity, and the hydrogen compression system and the equipment are controlled by the PLC. The automatic replacement and purging can be completed by using PLC to control the nitrogen replacement in the hydrogen compression system or the purging between devices.
When the hydrogen compression system is in emergency, the PLC can control the automatic valve group to act so as to close the hydrogen compression system without manual participation, and meanwhile, the replacement purging of nitrogen is carried out. And the fan is simultaneously turned on for external replacement among devices. The whole process is automatically controlled, the time required by manual action is shortened, and the overall safety is improved.
Meanwhile, a manual control function is reserved, automatic control by a PLC is not needed during routine shutdown maintenance, and unnecessary loss and waste are reduced.
1. The opening and closing of the inlet and outlet of the hydrogen compression system can be automatically controlled;
2. the opening and closing of the nitrogen entering the hydrogen compression system can be automatically controlled;
3. the gas after replacement can be automatically controlled to enter the emptying system;
4. the hydrogen compression system can be automatically replaced and purged between the internal equipment and the external equipment;
5. the manual control valve is reserved to meet the replacement requirement of routine shutdown maintenance.
The hydrogen concentration detection device is arranged between the devices whether the automatic replacement is carried out under emergency or the manual replacement is carried out during routine shutdown maintenance, and when the hydrogen concentration reaches an alarm value, the PLC can start the fan to purge the whole device.
Drawings
FIG. 1 is a schematic diagram of a prior art system;
FIG. 2 is a schematic diagram of a nitrogen displacement system for a hydrogen membrane compressor according to example 1;
FIG. 3 is a schematic diagram of a nitrogen displacement system for a hydrogen membrane compressor according to example 2;
reference numerals:
1-compressor, 2-first tee, 3-second tee, 4-third tee.
Detailed Description
For a better understanding of the present invention, the present invention will be further explained below with reference to the drawings and examples.
Examples
A hydrogen membrane compressor nitrogen displacement system, as shown in fig. 2, comprising:
the first pipeline sequentially comprises a hydrogen inlet TP1, an automatic valve-second end AOV1, a first tee joint 2 and a compressor 1;
a second pipeline, which comprises a compressor 1, a third tee 4, an automatic valve seven second end AOV7 and a hydrogen outlet TP2 in sequence,
the first tee joint 2 is also connected with a third pipeline, the other end of the third pipeline is connected with a nitrogen inlet TP3, a second tee joint 3 and an automatic valve two second end AOV2 are sequentially arranged between the nitrogen inlet TP3 and the first tee joint 2,
the second tee 3 is also connected with a fourth pipeline which comprises an automatic valve one first end SV1, an automatic valve two first end SV2, an automatic valve six first end SV6 and an automatic valve seven first end SV7 which are respectively connected in parallel,
the third tee joint 4 is connected with an automatic valve six second end AOV6 and an emptying system TP4;
the first end and the second end of each automatic valve are mutually communicated and respectively controlled by a PLC (programmable logic controller) in a linkage way.
When the system automatically and normally operates, hydrogen enters the system from TP1 and flows out of the system from TP 2. At this time, AOV1 and AOV3 keep a normally open state; the nitrogen displacement line AOV7 remains normally closed.
When the hydrogen compression system is in an emergency stop condition, the PLC controls the SV1 and the SV7 to be opened, and the AOV1 and the AOV3 are closed by opening the SV1 and the SV7 in a linkage way, so that the inlet and outlet of the hydrogen compression system are closed. Meanwhile, SV2 is opened, and AOV2 is opened in a chained manner, so that nitrogen for replacement purging enters the hydrogen compression system. And during displacement purging, the PLC controls SV6 to open the AOV6 in a linkage way, and hydrogen in the hydrogen compression system is discharged into the emptying system through the AOV 6. After the replacement purging is completed, the PLC controls SV2 to be in linkage with AOV2, and residual nitrogen and hydrogen in the nitrogen replacement system are discharged into the emptying system. Thus, the nitrogen automatic replacement process of the hydrogen compression system is completed.
Example 2
This embodiment differs from embodiment 1 in that: the automatic valve comprises an automatic valve body, a first tee joint 2, a second tee joint 4, a third tee joint 4, a fourth tee joint, a third tee joint and a fourth tee joint, wherein the automatic valve body comprises a manual valve body one BV1 between the automatic valve body one second end AOV1 and the first tee joint 2, the manual valve body four BV4 is arranged between the third tee joint 4 and the automatic valve body seven second end AOV7, the third pipeline comprises a manual valve body ten BV10 which is connected with the automatic valve body two second ends AOV2 in parallel, two sides of the manual valve body ten BV10 are respectively provided with a fifth tee joint and a sixth tee joint, the fifth tee joint is connected with the manual valve body eleven BV11 and the discharging system TP4, the sixth tee joint is connected with the manual valve body twelve BV12 and the discharging system TP4, the second pipeline comprises a fourth tee joint, and the fourth tee joint is connected with the manual valve body six BV6 and the discharging system TP4.
V3, the manual valves BV1 and BV4 are kept in a normally open state; the nitrogen replacement pipeline automatic valve AOV7 and the manual valve BV10 are kept in a normally closed state.
When the hydrogen compression system is in an emergency stop condition, the PLC controls the automatic valves SV1 and SV7 to be opened, and the AOV1 and the AOV3 are closed by opening the SV1 and the SV7 in a linkage way, so that the inlet and outlet of the hydrogen compression system are closed. Simultaneously, the automatic valve SV2 is opened, and the automatic valve AOV7 is opened in a chained manner, so that nitrogen for replacement purging enters the hydrogen compression system. During replacement purging, the PLC controls the automatic valve SV6 to open the automatic valve AOV6 in a linkage manner, and hydrogen in the hydrogen compression system is discharged into the emptying system through the AOV 6. After the replacement purging is completed, the PLC controls the automatic valve SV2 to close the automatic valve AOV7 in an interlocking way, and the manual valves BV11 and BV12 are opened manually to discharge residual nitrogen and hydrogen in the nitrogen replacement system into the emptying system. Thus, the nitrogen automatic replacement process of the hydrogen compression system is completed.
When the hydrogen compression system needs to be shut down and maintained in daily life, an automatic control system is not needed to participate in the shutdown of the system and the replacement process of nitrogen, so that a manual valve is reserved. And during routine shutdown maintenance, BV1 and BV4 are manually closed, and at the moment, the inlet and outlet of the hydrogen compression system are closed. The BV10 is opened and nitrogen is admitted to the hydrogen compression system. And opening BV6 to enable hydrogen in the hydrogen compression system to enter the bleeding system. After the replacement is completed, BV6 is closed, BV11 and BV12 are opened, and residual nitrogen and hydrogen in the nitrogen replacement system are discharged into the emptying system. The manual replacement process of the hydrogen compression system is completed.
The hydrogen concentration detection device is arranged between the devices whether the automatic replacement is carried out under emergency or the manual replacement is carried out during routine shutdown maintenance, and when the hydrogen concentration reaches an alarm value, the PLC can start the fan to purge the whole device.
Therefore, the automatic replacement system of the embodiment increases the automatic replacement capability while maintaining the manual capability, and the hydrogen compression system and the equipment are simultaneously controlled by the PLC. The automatic replacement and purging can be completed by using PLC to control the nitrogen replacement in the hydrogen compression system or the purging between devices.
The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent substitutions of the invention will occur to those skilled in the art, which are within the spirit and scope of the invention.
Claims (5)
1. A hydrogen membrane compressor nitrogen displacement system, comprising:
the first pipeline sequentially comprises a hydrogen inlet, a second end of the automatic valve, a first tee joint and a compressor;
a second pipeline, which comprises a compressor, a third tee joint, a seventh second end of the automatic valve and a hydrogen outlet in turn,
the first tee joint is also connected with a third pipeline, the other end of the third pipeline is connected with a nitrogen inlet, a second tee joint and an automatic valve second end are sequentially arranged between the nitrogen inlet and the first tee joint,
the second tee joint is also connected with a fourth pipeline, the fourth pipeline comprises a first end of an automatic valve I, a second first end of the automatic valve II, a sixth first end of the automatic valve and a seventh first end of the automatic valve which are respectively connected in parallel,
the third tee joint is connected with the sixth second end of the automatic valve and the emptying system;
the first end and the second end of each automatic valve are mutually communicated and respectively controlled by a PLC (programmable logic controller) in a linkage way.
2. The nitrogen displacement system of a hydrogen diaphragm compressor of claim 1, wherein a hydrogen concentration detection device connected to a PLC is provided in the equipment room.
3. The hydrogen diaphragm compressor nitrogen displacement system of claim 1, comprising a first manual valve between the first second end of the automatic valve and the first tee, a fourth manual valve between the third tee and the seventh second end of the automatic valve, the third pipeline comprising a tenth manual valve connected in parallel with the second end of the automatic valve, the tenth manual valve having a fifth tee and a sixth tee on each side, the fifth tee connecting the eleventh manual valve and the bleed system, the sixth tee connecting the twelfth manual valve and the bleed system, the second pipeline comprising a fourth tee connecting the sixth manual valve and the bleed system.
4. A nitrogen replacement method for a hydrogen diaphragm compressor is characterized in that a nitrogen replacement system for the hydrogen diaphragm compressor is adopted according to any one of claims 1-3,
when the system automatically and normally operates, hydrogen enters the system from the hydrogen inlet and flows out of the system from the hydrogen outlet, and the first second end of the automatic valve and the seventh second end of the automatic valve are kept in a normally open state; the second end of the automatic valve II is kept in a normally closed state;
when an emergency stop condition occurs, the PLC controls the first end of the automatic valve I, the first end of the automatic valve seven to be opened and the second end of the automatic valve I and the second end of the automatic valve seven to be closed in a linkage manner, so that the hydrogen inlet and the hydrogen outlet are closed, and meanwhile, the first end of the automatic valve II is opened and the second end of the automatic valve II is opened in a linkage manner, so that nitrogen for replacement purging enters the hydrogen compression system; and when the replacement purging is performed, the PLC controls the first end of the automatic valve six to be opened and the second end of the automatic valve six to be opened in a linkage manner, and hydrogen in the hydrogen compression system is discharged into the emptying system through the second end of the automatic valve six.
5. A nitrogen replacement method for a hydrogen diaphragm compressor is characterized in that a nitrogen replacement system for a hydrogen diaphragm compressor is adopted according to claim 3,
when the system automatically and normally operates, hydrogen enters the system from the hydrogen inlet and flows out of the system from the hydrogen outlet, and the first second end of the automatic valve, the seventh second end of the automatic valve, the first manual valve and the fourth manual valve are kept in a normally open state; the second end of the automatic valve II and the manual valve II are kept in a normally closed state;
when an emergency stop condition occurs, the PLC controls the first end of the automatic valve I, the first end of the automatic valve seven to be opened and the second end of the automatic valve I and the second end of the automatic valve seven to be closed in a linkage manner, so that the hydrogen inlet and the hydrogen outlet are closed, and meanwhile, the first end of the automatic valve II is opened and the second end of the automatic valve II is opened in a linkage manner, so that nitrogen for replacement purging enters the hydrogen compression system; when the replacement purging is performed, the PLC controls the first end of the automatic valve six to be opened and the second end of the automatic valve six to be opened in a linkage way, and hydrogen in the hydrogen compression system is discharged into the emptying system through the second end of the automatic valve six;
when the maintenance is stopped at daily, the manual valve I and the manual valve IV are manually closed, and at the moment, the inlet and the outlet of the hydrogen compression system are closed. And opening a manual valve ten to enable nitrogen to enter the hydrogen compression system, opening a manual valve six to enable hydrogen inside the hydrogen compression system to enter the emission system, closing the manual valve six after replacement is completed, opening a manual valve eleven and a manual valve twelve, and discharging residual nitrogen and hydrogen inside the nitrogen replacement system into the emission system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310163832.4A CN116066743A (en) | 2023-02-24 | 2023-02-24 | Nitrogen displacement system and method for hydrogen diaphragm compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310163832.4A CN116066743A (en) | 2023-02-24 | 2023-02-24 | Nitrogen displacement system and method for hydrogen diaphragm compressor |
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