CN116221059A - Compression ratio regulating and controlling method and device for multistage compression system - Google Patents
Compression ratio regulating and controlling method and device for multistage compression system Download PDFInfo
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- CN116221059A CN116221059A CN202310178276.8A CN202310178276A CN116221059A CN 116221059 A CN116221059 A CN 116221059A CN 202310178276 A CN202310178276 A CN 202310178276A CN 116221059 A CN116221059 A CN 116221059A
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- 238000007906 compression Methods 0.000 title claims abstract description 310
- 230000006835 compression Effects 0.000 title claims abstract description 308
- 230000001276 controlling effect Effects 0.000 title claims abstract description 75
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 159
- 238000006073 displacement reaction Methods 0.000 claims description 30
- 238000005984 hydrogenation reaction Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 34
- 239000001257 hydrogen Substances 0.000 abstract description 34
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 34
- 230000008569 process Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000009795 derivation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- F04B25/00—Multi-stage pumps
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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
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/008—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being a fluid transmission link
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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
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more pumps
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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
- F04B49/002—Hydraulic systems to change the pump delivery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to the technical field of automatic control, and provides a compression ratio regulating and controlling method and a regulating and controlling device for a multi-stage compression system, wherein the compression ratio regulating and controlling method for the multi-stage compression system comprises the following steps: obtaining the compression ratio of each compressor; determining the compression ratio of two adjacent compressors according to the compression ratio of each compressor; when the compression ratio of the rear-stage compressor is larger than that of the front-stage compressor in the two adjacent compressors, controlling the flow of the hydraulic oil circuit correspondingly connected with the rear-stage compressor to be reduced or controlling the flow of the hydraulic oil in the hydraulic oil circuit correspondingly connected with the front-stage compressor to be increased, otherwise, controlling the flow of the hydraulic oil circuit correspondingly connected with the rear-stage compressor to be increased or controlling the flow of the hydraulic oil in the hydraulic oil circuit correspondingly connected with the front-stage compressor to be reduced. By the arrangement, the problems of high exhaust temperature and low compression efficiency existing in the process of filling hydrogen into the hydrogen storage container by utilizing the multi-stage compression system in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a compression ratio regulating and controlling method and device for a multi-stage compression system.
Background
Hydrogen is currently stored primarily through hydrogen bottles as fuel for fuel cell vehicles, and is required to be fed at a hydrogen station through specialized hydrogen adding equipment. The hydrogenation equipment of the current hydrogenation station comprises a compressor and a hydrogen storage container, wherein after hydrogen is transported to the hydrogenation station through a tube bundle vehicle, the hydrogen is compressed and pressurized by the compressor, and then the compressed hydrogen is stored in the hydrogen storage container. When the hydrogen bottle of the vehicle needs to be hydrogenated, the hydrogen is filled into the hydrogen bottle by utilizing the pressure difference between the high-pressure hydrogen in the hydrogen storage container of the hydrogenation equipment and the low-pressure hydrogen in the hydrogen bottle of the vehicle.
The liquid-driven piston type hydrogen compressor is one of the main flow forms of hydrogenation equipment of the hydrogenation station, and the liquid-driven piston type hydrogen compressor is connected to form a multi-stage compression system, so that the compression efficiency of the hydrogenation equipment can be improved to a certain extent. After the design of the hydrogenation equipment in the prior art is finished, the volume ratio of each compressor of the multi-stage compression system adopted by the hydrogenation equipment is determined, and the constant pressure ratio operation can only be realized under specific working conditions. In the process of compressing and pressurizing the hydrogen in the tube bundle vehicle and storing the hydrogen in the hydrogen storage container by utilizing the multi-stage compression system, the pressure in the hydrogen storage container is gradually increased and the pressure in the tube bundle vehicle is gradually reduced due to the increase of the hydrogen amount in the hydrogen storage container. That is, the multistage compression system is in a dynamically varying working condition, and after deviating from the above specific working condition, the equal pressure ratio operation cannot be realized, the compression ratios of the stages of the multistage compression system deviate from each other, and there is a higher compression ratio of a certain stage, and a lower compression ratio of a certain stage, and the compressor cannot be operated in an optimal operation state. Particularly, for a compressor with an excessive compression ratio, the exhaust temperature is higher, the energy consumption is higher, and the compression efficiency of the hydrogenation equipment is lower.
Therefore, how to solve the problems of high exhaust temperature and low compression efficiency existing in the hydrogen filling process of the hydrogen storage container by using the multi-stage compression system in the prior art is an important technical problem to be solved by the person skilled in the art.
Disclosure of Invention
The invention provides a compression ratio regulating and controlling method and device for a multistage compression system, which are used for solving the defects of high exhaust temperature and low compression efficiency in the prior art when a hydrogen storage container is filled with hydrogen by using the multistage compression system.
The invention provides a compression ratio regulating and controlling method for a multistage compression system, the multistage compression system comprises at least two compressors connected in series, the compressors are liquid-driven compressors, each compressor is correspondingly connected with a set of hydraulic oil circuit, the hydraulic oil circuit is arranged to provide power for the compressors, and the compression ratio regulating and controlling method for the multistage compression system comprises the following steps:
obtaining the compression ratio of each compressor;
determining the magnitude relation of the compression ratios of two adjacent compressors according to the compression ratio of each compressor;
when the compression ratio of the rear-stage compressor is determined to be larger than that of the front-stage compressor, controlling the flow rate of hydraulic oil in the hydraulic oil path correspondingly connected with the rear-stage compressor to be reduced or controlling the flow rate of hydraulic oil in the hydraulic oil path correspondingly connected with the front-stage compressor to be increased.
According to the compression ratio regulating method for the multistage compression system provided by the invention, the compression ratio of each compressor is obtained, and the method comprises the following steps:
acquiring the air inlet pressure and the air outlet pressure of each compressor;
and determining the compression ratio of each compressor according to the air inlet pressure and the air outlet pressure of each compressor, wherein the compression ratio of each compressor is the ratio of the air outlet pressure to the air inlet pressure of the compressor.
According to the compression ratio regulating and controlling method for the multistage compression system, the hydraulic oil way comprises variable pumps, and the power input shafts of the variable pumps corresponding to the compressors are directly connected for transmission;
the controlling of the flow rate reduction of the hydraulic oil in the hydraulic oil path correspondingly connected to the rear stage compressor includes:
controlling the displacement of the variable displacement pump of the hydraulic oil circuit correspondingly connected with the rear-stage compressor to be reduced;
the controlling the flow rate increase of the hydraulic oil in the hydraulic oil path correspondingly connected with the pre-stage compressor includes:
controlling the displacement of the variable displacement pump of the hydraulic oil circuit correspondingly connected with the front-stage compressor to be increased;
the controlling the flow rate increase of the hydraulic oil in the hydraulic oil path correspondingly connected with the rear-stage compressor includes:
controlling the displacement of the variable displacement pump of the hydraulic oil circuit correspondingly connected with the rear-stage compressor to be increased;
the controlling the flow rate of the hydraulic oil in the hydraulic oil path correspondingly connected with the pre-stage compressor to be reduced includes:
and controlling the displacement of the variable displacement pump of the hydraulic oil circuit correspondingly connected with the front-stage compressor to be reduced.
According to the compression ratio regulating and controlling method for a multi-stage compression system provided by the invention, before determining the magnitude relation of compression ratios of two adjacent compressors, the method further comprises the following steps:
determining the difference value of the compression ratios of two adjacent compressors according to the compression ratio of each compressor;
when the absolute value of the difference value of the compression ratios is determined to be larger than a first preset threshold value, executing the magnitude relation of the compression ratios of the two adjacent compressors;
and when the absolute value of the difference value of the compression ratios is smaller than a first preset threshold value, judging consistency among the exhaust temperatures of the compressors.
According to the compression ratio regulating and controlling method for a multi-stage compression system provided by the invention, the method for judging the consistency between the exhaust temperatures of the compressors further comprises the following steps:
obtaining the exhaust temperature of each compressor;
determining an average value of the exhaust temperatures of the compressors according to the exhaust temperature of each compressor;
when the exhaust temperature of the compressor is determined to be higher than the average value of the exhaust temperatures, controlling the flow rate of hydraulic oil in the hydraulic oil path correspondingly connected to the compressor to be reduced, and when the exhaust temperature of the compressor is determined to be lower than the average value of the exhaust temperatures, controlling the flow rate of hydraulic oil in the hydraulic oil path correspondingly connected to the compressor to be increased.
According to the method for regulating and controlling the compression ratio of the multistage compression system provided by the invention, before determining the average value of the exhaust temperature of each compressor according to the exhaust temperature of each compressor, the method further comprises the following steps:
determining the difference value of the exhaust temperatures of two adjacent compressors according to the exhaust temperature of each compressor;
executing the determination of the average value of the discharge temperatures of the compressors when the absolute value of the difference value of the discharge temperatures is determined to be larger than a second preset threshold value;
and re-executing the obtaining of the compression ratio of each compressor when the absolute value of the difference value of the exhaust gas temperature is determined to be smaller than a second preset threshold value.
The invention also provides a compression ratio regulating device for a multistage compression system, the multistage compression system comprises at least two compressors connected in series, the compressors are liquid-driven compressors, each compressor is correspondingly connected with a set of hydraulic oil circuit, the hydraulic oil circuit is arranged to provide power for the compressors, and the compression ratio regulating device for the multistage compression system comprises:
the first acquisition module is used for acquiring the compression ratio of each compressor;
the first determining module is used for determining the magnitude relation of the compression ratios of two adjacent compressors according to the compression ratio of each compressor;
and the first control module is used for controlling the flow of hydraulic oil in the hydraulic oil circuit correspondingly connected with the rear-stage compressor to be reduced or controlling the flow of hydraulic oil in the hydraulic oil circuit correspondingly connected with the front-stage compressor to be increased when the compression ratio of the rear-stage compressor is determined to be larger than that of the front-stage compressor in two adjacent compressors, and controlling the flow of hydraulic oil in the hydraulic oil circuit correspondingly connected with the rear-stage compressor to be increased or controlling the flow of hydraulic oil in the hydraulic oil circuit correspondingly connected with the front-stage compressor to be reduced when the compression ratio of the rear-stage compressor is determined to be smaller than that of the front-stage compressor in two adjacent compressors.
According to the compression ratio regulating device for the multi-stage compression system provided by the invention, the compression ratio regulating device further comprises:
the second determining module is used for determining the difference value of the compression ratios of two adjacent compressors according to the compression ratio of each compressor;
the second control module is used for executing the magnitude relation of the compression ratios of the two adjacent compressors when the absolute value of the difference value of the compression ratios is determined to be larger than a first preset threshold value, and judging the consistency of the exhaust temperatures of the compressors when the absolute value of the difference value of the compression ratios is determined to be smaller than the first preset threshold value;
the second acquisition module is used for acquiring the exhaust temperature of each compressor;
the third determining module is used for determining the average value of the exhaust temperatures of the compressors according to the exhaust temperature of each compressor;
and the third control module is used for controlling the flow rate of the hydraulic oil in the hydraulic oil circuit correspondingly connected with the compressor to be reduced when the exhaust temperature of the compressor is determined to be higher than the average value of the exhaust temperature, and controlling the flow rate of the hydraulic oil in the hydraulic oil circuit correspondingly connected with the compressor to be increased when the exhaust temperature of the compressor is determined to be lower than the average value of the exhaust temperature.
The invention also provides a multi-stage compression system which can execute the compression ratio regulating and controlling method for the multi-stage compression system or comprises the compression ratio regulating and controlling device for the multi-stage compression system.
The invention also provides hydrogenation equipment comprising the multi-stage compression system.
In the compression ratio regulating and controlling method for the multistage compression system, the compression ratio of each compressor is firstly obtained, and then the magnitude relation of the compression ratios of two adjacent compressors is determined. When the compression ratio of the rear-stage compressor positioned at the rear stage is larger than that of the front-stage compressor positioned at the front stage in the two adjacent compressors, the flow of hydraulic oil in a hydraulic oil path correspondingly connected with the rear-stage compressor can be controlled to be reduced so as to reduce the compression speed of the rear-stage compressor and reduce the air suction amount of the rear-stage compressor; the flow rate of hydraulic oil in a hydraulic oil way correspondingly connected with the front-stage compressor can be controlled to be increased so as to improve the compression speed of the front-stage compressor and increase the displacement of the front-stage compressor. The inter-stage pressure between the adjacent two compressors is increased, so that the compression ratio of the front-stage compressor can be increased, the compression ratio of the rear-stage compressor can be reduced, and the compression ratios of the adjacent two compressors gradually become equal. When the compression ratio of the rear-stage compressor positioned at the rear stage is smaller than that of the front-stage compressor positioned at the front stage in the two adjacent compressors, the flow rate of hydraulic oil in a hydraulic oil path correspondingly connected with the rear-stage compressor can be controlled to be increased so as to improve the compression speed of the rear-stage compressor and increase the air suction amount of the rear-stage compressor; the flow of hydraulic oil in the hydraulic oil way correspondingly connected with the front-stage compressor can be controlled to be reduced so as to reduce the compression speed of the front-stage compressor and reduce the displacement of the front-stage compressor. The inter-stage pressure between the adjacent two compressors is reduced, so that the compression ratio of the front-stage compressor can be reduced, and the compression ratio of the rear-stage compressor can be increased, so that the compression ratios of the adjacent two compressors gradually approach to be equal. The method is adopted for regulating and controlling any two adjacent compressors in the multi-stage compression system, so that the compression ratio of each compressor tends to be equal, the multi-stage compression system is operated under the equal pressure ratio working condition, the problems that the compression ratio of a certain stage of compressors is higher and the compression ratio of a certain stage of compressors is lower are avoided, each compressor can share the compression ratio uniformly, the multi-stage compression system is in the optimal operation state, the problem that the exhaust temperature of the compressors is too high is effectively avoided, the energy consumption is reduced, the probability that sealing elements in the compressors are damaged is reduced, the service life of the compressors is prolonged, the compression efficiency of hydrogenation equipment is improved, and the problems that the exhaust temperature of a hydrogenation station in the prior art is high and the compression efficiency is low when the multi-stage compression system is used for filling hydrogen into a hydrogen storage container are solved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a compression ratio modulation method for a multi-stage compression system provided by the present invention;
fig. 2 is a flowchart of the compression ratio regulating method for a multi-stage compression system according to the present invention when applied to a two-stage compression system having two compressors.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The compression ratio control method for a multi-stage compression system, the compression ratio control apparatus for a multi-stage compression system, the multi-stage compression system, and the hydrogenation apparatus of the present invention are described below with reference to fig. 1 to 2.
Fig. 1 and fig. 2 are schematic flow diagrams of a compression ratio regulating method for a multi-stage compression system according to an embodiment of the present invention.
The multistage compression system comprises at least two compressors, wherein each compressor is sequentially connected in series, namely, the exhaust port of one compressor is connected with the air inlet of the other compressor in two adjacent compressors.
The compressors are liquid-driven compressors, each compressor is correspondingly connected with a set of hydraulic oil circuit, and the hydraulic oil circuit is arranged to provide power for the compressors.
Specifically, the compressor may be a liquid-driven piston compressor, where the liquid-driven piston compressor includes a hydraulic cylinder and a cylinder, the hydraulic cylinder is coaxially disposed with the cylinder, and a piston in the hydraulic cylinder is connected with a piston in the cylinder through a piston rod. The hydraulic cylinder is connected with the hydraulic oil path, and the piston in the hydraulic cylinder is driven to reciprocate through hydraulic pressure, so that the piston in the cylinder can be driven to reciprocate, and the compression of gas can be realized.
The compression ratio regulating and controlling method for the multi-stage compression system provided by the embodiment of the invention comprises the following steps:
and 130, when the compression ratio of the rear-stage compressor is determined to be larger than that of the front-stage compressor in the two adjacent compressors, controlling the flow of hydraulic oil in the hydraulic oil paths correspondingly connected with the rear-stage compressor to be reduced or controlling the flow of hydraulic oil in the hydraulic oil paths correspondingly connected with the front-stage compressor to be increased, and when the compression ratio of the rear-stage compressor is determined to be smaller than that of the front-stage compressor in the two adjacent compressors, controlling the flow of hydraulic oil in the hydraulic oil paths correspondingly connected with the rear-stage compressor to be increased or controlling the flow of hydraulic oil in the hydraulic oil paths correspondingly connected with the front-stage compressor to be reduced.
It will be appreciated that the compression ratio of the compressor in this embodiment is the ratio of the discharge pressure to the intake pressure of the compressor.
The discharge pressure of a compressor is the pressure at the discharge port of the compressor, and for a multi-stage compression system, the inter-stage pressure between two adjacent compressors may be used as the discharge pressure of the compressor preceding the compressor. For a final stage compressor of a multi-stage compression system located at the last stage, the pressure at the discharge port of the compressor may be directly collected.
The intake pressure of a compressor is the pressure at the intake of the compressor, and for a multi-stage compression system, the inter-stage pressure between two adjacent compressors can be considered as the intake pressure of the compressor of the subsequent stage of the two adjacent compressors. For a first stage compressor of a multi-stage compression system located at a first stage, the pressure at the inlet of the compressor may be directly collected.
Specifically, when the compression ratio of each compressor of the multistage compression system is regulated, the compression ratio of each compressor is obtained first, and then the magnitude relation of the compression ratios of two adjacent compressors is determined.
When the compression ratio of the rear-stage compressor positioned at the rear stage is larger than that of the front-stage compressor positioned at the front stage in the two adjacent compressors, the flow of hydraulic oil in a hydraulic oil path correspondingly connected with the rear-stage compressor can be controlled to be reduced so as to reduce the compression speed of the rear-stage compressor and reduce the air suction amount of the rear-stage compressor; the flow rate of hydraulic oil in a hydraulic oil way correspondingly connected with the front-stage compressor can be controlled to be increased so as to improve the compression speed of the front-stage compressor and increase the displacement of the front-stage compressor. The inter-stage pressure between the adjacent two compressors is increased, that is, the discharge pressure of the preceding compressor is increased and the intake pressure of the subsequent compressor is increased in the adjacent two compressors. Thus, the compression ratio of the front-stage compressor is increased, the compression ratio of the rear-stage compressor is reduced, the difference between the compression ratios of the two adjacent compressors is reduced, and the compression ratios of the two adjacent compressors gradually become equal.
When the compression ratio of the rear-stage compressor positioned at the rear stage is smaller than that of the front-stage compressor positioned at the front stage in the two adjacent compressors, the flow rate of hydraulic oil in a hydraulic oil path correspondingly connected with the rear-stage compressor can be controlled to be increased so as to improve the compression speed of the rear-stage compressor and increase the air suction amount of the rear-stage compressor; the flow of hydraulic oil in the hydraulic oil way correspondingly connected with the front-stage compressor can be controlled to be reduced so as to reduce the compression speed of the front-stage compressor and reduce the displacement of the front-stage compressor. The inter-stage pressure between the adjacent two compressors is reduced, that is, the discharge pressure of the preceding compressor is reduced and the intake pressure of the subsequent compressor is reduced. Thus, the compression ratio of the front-stage compressor is reduced, the compression ratio of the rear-stage compressor is increased, the difference between the compression ratios of the two adjacent compressors is reduced, and the compression ratios of the two adjacent compressors gradually tend to be equal.
By adopting the method for regulating and controlling any two adjacent compressors in the multi-stage compression system, the difference value of the compression ratios of any two adjacent compressors can be effectively reduced, and the compression ratios of any two adjacent compressors gradually tend to be equal. The compression ratios of the compressors of the multistage compression system tend to be equal, so that the multistage compression system operates under the working condition of equal pressure ratio, the problems that the compression ratio of a certain stage of compressor is higher and the compression ratio of a certain stage of compressor is lower are avoided, each compressor can share the compression ratio uniformly, the multistage compression system is in an optimal running state, the problem that the exhaust temperature of the compressors is too high is effectively avoided, the energy consumption is reduced, the probability of damaging sealing elements in the compressors is reduced, the service life of the compressors is prolonged, the compression efficiency of hydrogenation equipment is improved, and the problems that the exhaust temperature is high and the compression efficiency is low when a hydrogenation station in the prior art is used for filling hydrogen into a hydrogen storage container by using the multistage compression system are solved.
When the flow rate of the hydraulic oil in the hydraulic oil path correspondingly connected with the compressor is controlled to be reduced or increased, the adjustment speed of the compression ratio is relatively high when the change value of each adjustment is large; when the change value of each adjustment is smaller, the adjustment precision of the compression ratio is relatively higher, and the compression ratio is determined according to the requirement.
In the present embodiment, the constant pressure ratio operation mode means that the compression ratios of the compressors are substantially equal, and a certain deviation is allowed between the compression ratios of the compressors.
For the acquisition of the compression ratio of each compressor, in this embodiment, the intake pressure and the exhaust pressure of each compressor are acquired respectively, and then the ratio of the exhaust pressure to the intake pressure of each compressor is used as the compression ratio of the compressor according to the intake pressure and the exhaust pressure of each compressor.
In the case of two adjacent compressors, the inter-stage pressure between the two adjacent compressors may be used as both the discharge pressure of the preceding compressor and the intake pressure of the following compressor. The number of collection times of the intake pressure and the exhaust pressure can be reduced, the number of pressure collection elements in the multi-stage compression system can be reduced, the structure of the multi-stage compression system is simplified, and the cost of the multi-stage compression system is reduced.
In this embodiment, the hydraulic oil path includes a variable pump, and the variable pump is connected to a hydraulic cylinder of the compressor through a hydraulic pipeline and an electrohydraulic reversing valve. The variable pump provides power for hydraulic oil, and the electrohydraulic reversing valve switches the flow direction of the hydraulic oil so as to enable a piston in a hydraulic cylinder of the compressor to slide back and forth.
In this embodiment, the flow rate of the hydraulic oil in the hydraulic oil passage is adjusted by adjusting the displacement of the variable displacement pump.
Specifically, if the flow rate of the hydraulic oil in the hydraulic oil passage corresponding to the subsequent-stage compressor is to be controlled to be reduced, the displacement of the variable displacement pump of the hydraulic oil passage corresponding to the subsequent-stage compressor may be controlled to be reduced. If the flow rate of the hydraulic oil in the hydraulic oil path corresponding to the front-stage compressor is to be controlled to be increased, the displacement of the variable pump of the hydraulic oil path corresponding to the front-stage compressor can be controlled to be increased.
If the flow rate of the hydraulic oil in the hydraulic oil passage correspondingly connected to the rear-stage compressor is to be controlled to be increased, the displacement of the variable pump of the hydraulic oil passage correspondingly connected to the rear-stage compressor can be controlled to be increased. If the flow of the hydraulic oil in the hydraulic oil passage correspondingly connected to the preceding stage compressor is to be controlled to be reduced, the displacement of the variable pump of the hydraulic oil passage correspondingly connected to the preceding stage compressor can be controlled to be reduced.
In this embodiment, the power input shafts of the variable pumps of the hydraulic oil paths correspondingly connected to the compressors are coaxially arranged, and the power input shafts of two adjacent variable pumps are in transmission connection through a coupling. By the arrangement, all variable pumps can be driven to synchronously operate by one driving piece, so that the cost of the multi-stage compression system can be reduced, and the occupied space of the multi-stage compression system is reduced. At this time, the rotation speed of the variable displacement pump in the hydraulic oil passage corresponding to each compressor is the same.
The driving member may be an electric motor or a hydraulic motor.
The variable pump can be a swash plate type variable pump, and the stroke of the plunger can be adjusted by rotating the swash plate and adjusting the inclination angle of the swash plate, so that the displacement of the variable pump can be adjusted.
In the embodiment of the invention, after the compression ratio of each compressor is obtained and before the magnitude relation of the compression ratios of two adjacent compressors is determined, the degree of deviation of the compression ratios of the compressors is required to be judged.
It is possible to determine whether the difference in compression ratios of the adjacent two compressors is within a preset range.
Specifically, the difference between the compression ratios of two adjacent compressors may be determined according to the compression ratio of each compressor. And then comparing the absolute value of the obtained difference value of the compression ratio with a first preset threshold value.
And if the absolute value of the difference value of the compression ratios is larger than a first preset threshold value, determining the magnitude relation of the compression ratios of two adjacent compressors. According to the magnitude relation of the compression ratios of the two adjacent compressors, the flow rate of hydraulic oil in the hydraulic oil circuit correspondingly connected with the rear-stage compressor in the two adjacent compressors is adjusted or the flow rate of hydraulic oil in the hydraulic oil circuit correspondingly connected with the front-stage compressor in the two adjacent compressors is adjusted.
The first preset threshold value can be determined according to the consistency requirement of the compression ratio of each compressor, and when the first preset threshold value is relatively large, the difficulty in regulating and controlling the compression ratio of each compressor of the multistage compression system is relatively low; when the first preset threshold is set relatively small, the consistency of the compression ratios of the individual compressors of the multi-stage compression system is high.
Even after the difference between the compression ratios of the adjacent two compressors is smaller than the first preset threshold, a certain difference exists between the compression ratios of the adjacent two compressors, the compression efficiencies of the adjacent two compressors are different, and the exhaust temperatures of the adjacent two compressors are also different.
In a further embodiment, after determining that the absolute value of the difference between the compression ratios is smaller than the first preset threshold, consistency between the discharge temperatures of the compressors may be further determined, and the compression ratios of the compressors may be further adjusted according to the discharge temperatures of the compressors.
Specifically, the discharge temperature of each compressor may be obtained first, and the average value of the discharge temperatures of the compressors may be determined based on the discharge temperatures of the compressors. The discharge temperature of each compressor is then compared to the average of the discharge temperatures.
The average value of the above-mentioned discharge temperatures is the ratio of the sum of the discharge temperatures of all compressors to the total number of compressors.
When the discharge temperature of the compressor is higher than the average value of the discharge temperatures, the flow rate of the hydraulic oil in the hydraulic oil passage connected to the compressor is controlled to be reduced. The compression speed of the compressor is properly reduced, the suction amount of the compressor is reduced, the inter-stage pressure between the compressor and the compressor in the previous stage is increased, the inter-stage pressure between the compressor and the compressor in the next stage is reduced, the compression ratio of the compressor can be properly reduced, the heat generation amount in the compression process is reduced, and the exhaust temperature of the compressor is properly reduced.
When the discharge temperature of the compressor is lower than the average value of the discharge temperatures, the flow rate of the hydraulic oil in the hydraulic oil passage connected to the compressor is controlled to be increased. The compression speed of the compressor is properly increased, the suction quantity of the compressor is increased, the interstage pressure between the compressor and the compressor in the previous stage is reduced, the interstage pressure between the compressor and the compressor in the next stage is increased, the compression ratio of the compressor can be properly increased, the heat generating quantity in the compression process is increased, and the exhaust temperature of the compressor is properly increased.
The change value of each adjustment when the flow rate of the hydraulic oil in the hydraulic oil passage is adjusted according to the discharge temperature of the compressors is smaller than the change value of each adjustment when the flow rate of the hydraulic oil in the hydraulic oil passage is adjusted according to the magnitude relation of the compression ratios of the adjacent two compressors.
In a further embodiment, the degree of deviation of the discharge temperature of each compressor needs to be determined before the average value of the discharge temperature of each compressor is determined according to the discharge temperature of each compressor.
It is possible to determine whether the difference in the discharge temperatures of the adjacent two compressors is within a preset range.
Specifically, the difference between the discharge temperatures of two adjacent compressors may be determined based on the discharge temperature of each compressor. And then comparing the absolute value of the difference value of the obtained exhaust gas temperature with a second preset threshold value.
If the absolute value of the difference value of the exhaust temperatures is larger than a second preset threshold value, determining the average value of the exhaust temperatures of the compressors according to the exhaust temperatures of the compressors. And adjusting the flow of hydraulic oil in the hydraulic oil way correspondingly connected with the compressors according to the relation between the exhaust temperature of each compressor and the average value of the exhaust temperature.
If the absolute value of the difference value of the exhaust temperature is smaller than a second preset threshold value, the compression ratio of each compressor is obtained again, the difference value of the compression ratios of two adjacent compressors is determined again according to the compression ratio of each compressor, and then whether the difference value of the compression ratios of the two adjacent compressors is in a preset range is judged again so as to detect the state of each compressor in real time and realize dynamic adjustment of the compression ratio of each compressor.
The arrangement combines the detection of the exhaust temperature of each compressor, dynamically adjusts the compression ratio of each compressor, not only can control the deviation degree of the compression ratio of each compressor within a certain range, but also reduces the difficulty in regulating and controlling the compression ratio of the compressors under the condition that the multistage compression system is ensured to be in a better running state; the compression ratio adjusting precision of the multistage compression system can be further improved, the deviation of the compression ratio of each compressor is further reduced, and the consistency of the compression ratio of each compressor is improved.
On the other hand, based on the same general inventive concept, the embodiments of the present invention also provide a compression ratio regulating device for a multi-stage compression system, and the compression ratio regulating device for a multi-stage compression system described below and the compression ratio regulating method for a multi-stage compression system described above may be referred to correspondingly to each other.
The multistage compression system comprises at least two compressors, wherein each compressor is sequentially connected in series, namely, the exhaust port of one compressor is connected with the air inlet of the other compressor in two adjacent compressors.
The compressors are liquid-driven compressors, each compressor is correspondingly connected with a set of hydraulic oil circuit, and the hydraulic oil circuit is arranged to provide power for the compressors.
Specifically, the compressor may be a liquid-driven piston compressor, where the liquid-driven piston compressor includes a hydraulic cylinder and a cylinder, the hydraulic cylinder is coaxially disposed with the cylinder, and a piston in the hydraulic cylinder is connected with a piston in the cylinder through a piston rod. The hydraulic cylinder is connected with the hydraulic oil path, and the piston in the hydraulic cylinder is driven to reciprocate through hydraulic pressure, so that the piston in the cylinder can be driven to reciprocate, and the compression of gas can be realized.
The embodiment of the invention provides a compression ratio regulating and controlling device for a multistage compression system, which comprises a first acquisition module, a first determination module and a first control module.
The first acquisition module is used for acquiring the compression ratio of each compressor.
The first determining module is used for determining the magnitude relation of the compression ratios of two adjacent compressors according to the compression ratio of each compressor.
The first control module is used for controlling the flow of hydraulic oil in a hydraulic oil path correspondingly connected with the rear-stage compressor to be reduced or controlling the flow of hydraulic oil in the hydraulic oil path correspondingly connected with the front-stage compressor to be increased when the compression ratio of the rear-stage compressor is determined to be larger than that of the front-stage compressor in two adjacent compressors, and controlling the flow of hydraulic oil in the hydraulic oil path correspondingly connected with the rear-stage compressor to be increased or controlling the flow of hydraulic oil in the hydraulic oil path correspondingly connected with the front-stage compressor to be reduced when the compression ratio of the rear-stage compressor is determined to be smaller than that of the front-stage compressor in two adjacent compressors.
In an exemplary embodiment, the first obtaining module may be specifically configured to obtain an intake pressure and an exhaust pressure of each compressor; and determining the compression ratio of each compressor according to the air inlet pressure and the air outlet pressure of each compressor, wherein the compression ratio of each compressor is the ratio of the air outlet pressure to the air inlet pressure of the compressor.
The hydraulic oil way comprises variable pumps, and the variable pumps are directly connected with power input shafts of the variable pumps corresponding to the compressors.
The first control module is specifically used for controlling the displacement of a variable pump of a hydraulic oil way correspondingly connected with the compressor.
The embodiment of the invention provides a compression ratio regulating device for a multistage compression system, which further comprises a second determining module and a second control module.
The second determining module is used for determining the difference value of the compression ratios of two adjacent compressors according to the compression ratio of each compressor.
The second control module is used for executing the determination of the magnitude relation of the compression ratios of two adjacent compressors when the absolute value of the difference value of the compression ratios is determined to be larger than a first preset threshold value, and judging the consistency of the exhaust temperatures of the compressors when the absolute value of the difference value of the compression ratios is determined to be smaller than the first preset threshold value.
In the embodiment of the invention, the compression ratio regulating device for the multi-stage compression system further comprises a second acquisition module, a third determination module and a third control module.
The second acquisition module is used for acquiring the exhaust temperature of each compressor.
The third determining module is used for determining the average value of the exhaust temperature of each compressor according to the exhaust temperature of each compressor.
And the third control module is used for controlling the flow of the hydraulic oil in the hydraulic oil way correspondingly connected with the compressor to be reduced when the exhaust temperature of the compressor is higher than the average value of the exhaust temperature, and otherwise controlling the flow of the hydraulic oil in the hydraulic oil way correspondingly connected with the compressor to be increased.
In still another aspect, based on the same general inventive concept, an embodiment of the present invention further provides a multi-stage compression system capable of executing the compression ratio adjusting method for a multi-stage compression system provided in any one of the above embodiments, or including the compression ratio adjusting device for a multi-stage compression system provided in the above embodiment, capable of realizing an isobaric ratio operation, and having an advantage of high compression efficiency. The derivation process of the beneficial effects of the multi-stage compression system in the embodiment of the present invention is substantially similar to the derivation process of the beneficial effects of the compression ratio adjusting method for the multi-stage compression system or the compression ratio adjusting device for the multi-stage compression system described above, and therefore will not be described herein.
On the other hand, based on the same general inventive concept, the embodiment of the invention also provides a hydrogenation device, which comprises the multi-stage compression system provided by the embodiment, and has the advantages of low energy consumption and high efficiency. The derivation process of the beneficial effects of the hydrogenation apparatus in the embodiment of the present invention is substantially similar to that of the multi-stage compression system described above, and therefore will not be described herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The compression ratio regulating and controlling method for the multistage compression system is characterized in that the multistage compression system comprises at least two compressors connected in series, the compressors are liquid-driven compressors, each compressor is correspondingly connected with a set of hydraulic oil circuit, the hydraulic oil circuit is arranged to provide power for the compressors, and the compression ratio regulating and controlling method for the multistage compression system comprises the following steps:
obtaining the compression ratio of each compressor;
determining the magnitude relation of the compression ratios of two adjacent compressors according to the compression ratio of each compressor;
when the compression ratio of the rear-stage compressor is determined to be larger than that of the front-stage compressor, controlling the flow rate of hydraulic oil in the hydraulic oil path correspondingly connected with the rear-stage compressor to be reduced or controlling the flow rate of hydraulic oil in the hydraulic oil path correspondingly connected with the front-stage compressor to be increased.
2. The compression ratio regulating method for a multi-stage compression system according to claim 1, wherein said obtaining the compression ratio of each of said compressors comprises:
acquiring the air inlet pressure and the air outlet pressure of each compressor;
and determining the compression ratio of each compressor according to the air inlet pressure and the air outlet pressure of each compressor, wherein the compression ratio of each compressor is the ratio of the air outlet pressure to the air inlet pressure of the compressor.
3. The compression ratio regulating method for a multistage compression system according to claim 1, wherein the hydraulic oil passage includes variable pumps, and power input shafts of the variable pumps corresponding to the respective compressors are directly driven;
the controlling of the flow rate reduction of the hydraulic oil in the hydraulic oil path correspondingly connected to the rear stage compressor includes:
controlling the displacement of the variable displacement pump of the hydraulic oil circuit correspondingly connected with the rear-stage compressor to be reduced;
the controlling the flow rate increase of the hydraulic oil in the hydraulic oil path correspondingly connected with the pre-stage compressor includes:
controlling the displacement of the variable displacement pump of the hydraulic oil circuit correspondingly connected with the front-stage compressor to be increased;
the controlling the flow rate increase of the hydraulic oil in the hydraulic oil path correspondingly connected with the rear-stage compressor includes:
controlling the displacement of the variable displacement pump of the hydraulic oil circuit correspondingly connected with the rear-stage compressor to be increased;
the controlling the flow rate of the hydraulic oil in the hydraulic oil path correspondingly connected with the pre-stage compressor to be reduced includes:
and controlling the displacement of the variable displacement pump of the hydraulic oil circuit correspondingly connected with the front-stage compressor to be reduced.
4. The compression ratio regulating method for a multi-stage compression system according to claim 1, further comprising, before determining the magnitude relation of compression ratios of two adjacent compressors:
determining the difference value of the compression ratios of two adjacent compressors according to the compression ratio of each compressor;
when the absolute value of the difference value of the compression ratios is determined to be larger than a first preset threshold value, executing the magnitude relation of the compression ratios of the two adjacent compressors;
and when the absolute value of the difference value of the compression ratios is smaller than a first preset threshold value, judging consistency among the exhaust temperatures of the compressors.
5. The compression ratio regulating method for a multi-stage compression system according to claim 4, wherein said determining consistency between discharge temperatures of each of said compressors further comprises:
obtaining the exhaust temperature of each compressor;
determining an average value of the exhaust temperatures of the compressors according to the exhaust temperature of each compressor;
when the exhaust temperature of the compressor is determined to be higher than the average value of the exhaust temperatures, controlling the flow rate of hydraulic oil in the hydraulic oil path correspondingly connected to the compressor to be reduced, and when the exhaust temperature of the compressor is determined to be lower than the average value of the exhaust temperatures, controlling the flow rate of hydraulic oil in the hydraulic oil path correspondingly connected to the compressor to be increased.
6. The method of claim 5, wherein before determining an average value of the discharge temperatures of the respective compressors according to the discharge temperature of each of the compressors, further comprising:
determining the difference value of the exhaust temperatures of two adjacent compressors according to the exhaust temperature of each compressor;
executing the determination of the average value of the discharge temperatures of the compressors when the absolute value of the difference value of the discharge temperatures is determined to be larger than a second preset threshold value;
and re-executing the obtaining of the compression ratio of each compressor when the absolute value of the difference value of the exhaust gas temperature is determined to be smaller than a second preset threshold value.
7. The utility model provides a compression ratio regulation and control device for multistage compression system, its characterized in that, multistage compression system includes two at least compressors of series connection, the compressor is the liquid drive type compressor, each the compressor corresponds one set of hydraulic oil circuit of connection, the hydraulic oil circuit sets up to provide power for the compressor, a compression ratio regulation and control device for multistage compression system includes:
the first acquisition module is used for acquiring the compression ratio of each compressor;
the first determining module is used for determining the magnitude relation of the compression ratios of two adjacent compressors according to the compression ratio of each compressor;
and the first control module is used for controlling the flow of hydraulic oil in the hydraulic oil circuit correspondingly connected with the rear-stage compressor to be reduced or controlling the flow of hydraulic oil in the hydraulic oil circuit correspondingly connected with the front-stage compressor to be increased when the compression ratio of the rear-stage compressor is determined to be larger than that of the front-stage compressor in two adjacent compressors, and controlling the flow of hydraulic oil in the hydraulic oil circuit correspondingly connected with the rear-stage compressor to be increased or controlling the flow of hydraulic oil in the hydraulic oil circuit correspondingly connected with the front-stage compressor to be reduced when the compression ratio of the rear-stage compressor is determined to be smaller than that of the front-stage compressor in two adjacent compressors.
8. The compression ratio regulating device for a multi-stage compression system according to claim 7, further comprising:
the second determining module is used for determining the difference value of the compression ratios of two adjacent compressors according to the compression ratio of each compressor;
the second control module is used for executing the magnitude relation of the compression ratios of the two adjacent compressors when the absolute value of the difference value of the compression ratios is determined to be larger than a first preset threshold value, and judging the consistency of the exhaust temperatures of the compressors when the absolute value of the difference value of the compression ratios is determined to be smaller than the first preset threshold value;
the second acquisition module is used for acquiring the exhaust temperature of each compressor;
the third determining module is used for determining the average value of the exhaust temperatures of the compressors according to the exhaust temperature of each compressor;
and the third control module is used for controlling the flow rate of the hydraulic oil in the hydraulic oil circuit correspondingly connected with the compressor to be reduced when the exhaust temperature of the compressor is determined to be higher than the average value of the exhaust temperature, and controlling the flow rate of the hydraulic oil in the hydraulic oil circuit correspondingly connected with the compressor to be increased when the exhaust temperature of the compressor is determined to be lower than the average value of the exhaust temperature.
9. A multi-stage compression system capable of performing the compression ratio regulating method for a multi-stage compression system according to any one of claims 1 to 6 or comprising the compression ratio regulating apparatus for a multi-stage compression system according to any one of claims 7 to 8.
10. A hydrogenation apparatus comprising a multi-stage compression system according to claim 9.
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