CN112525446B - Automatic pressure testing system for hydrogenation station equipment - Google Patents
Automatic pressure testing system for hydrogenation station equipment Download PDFInfo
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- CN112525446B CN112525446B CN202110186831.2A CN202110186831A CN112525446B CN 112525446 B CN112525446 B CN 112525446B CN 202110186831 A CN202110186831 A CN 202110186831A CN 112525446 B CN112525446 B CN 112525446B
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- 238000012360 testing method Methods 0.000 title claims abstract description 294
- 238000005984 hydrogenation reaction Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 200
- 238000000034 method Methods 0.000 claims description 24
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 11
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004801 process automation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0611—Hydraulic or pneumatic indicating, recording or sensing means
Abstract
The invention provides an automatic pressure test system for hydrogenation station equipment, which comprises the following components: the device comprises an air compressor, pressure test equipment, a first air cylinder, a second air cylinder and an air-driven pump; air is pressurized by an air compressor to provide driving force for the air-driven pump; the first gas cylinder and the second gas cylinder provide pressure test gas sources for pressure test equipment; the first gas cylinder and the second gas cylinder are respectively connected with a first pressure transmitter and a second pressure transmitter; when the air pressure of the first air bottle or the second air bottle is high, a pressure test air source is directly provided for the pressure test equipment, otherwise, the pressure test air source is provided for the pressure test equipment through the air drive pump; the pressure test equipment comprises an air pressure test mode, an air tightness test mode and a leakage test mode; the modes are controlled by corresponding electromagnetic valves and can be combined at will. The beneficial effects provided by the invention are as follows: through logic control, the electromagnetic valve and the gas drive pump are operated to reduce or increase pressure of the system, arbitrary combination of the three independent test modes is guaranteed, pressure test efficiency is improved, and nitrogen force is saved.
Description
Technical Field
The invention relates to the technical field of hydrogen energy sources, in particular to an automatic pressure test system for hydrogen station equipment.
Background
At present, in a factory, most of pressure test systems adopted in an air pressure test and an air tightness test are manually operated, and workers record data and judge test effects.
As the equipment of the hydrogenation station is often high in pressure (more than or equal to 20 MPAG), pressure test systems adopted by the air pressure test and the air tightness test are operated by people, and the uncertainty of field safety is increased.
Disclosure of Invention
In view of the above, the present invention provides an automatic pressure testing system for a hydrogen station device, which satisfies the pressure testing of the hydrogen station device, the design pressure of the hydrogen station device is usually 22MPa, 25MPa, 48.3MPa and 49.5MPa, the system satisfies the pressure required by the air pressure test, the air tightness test and the leakage test of these devices, and the highest test pressure reaches 55 MPa. The pressure test system is arranged in an explosion-proof room, and an operator controls the pressure test system outside, so that the pressure test system is not directly contacted with the pressurization system in the high-pressure operation process, and the pressure test system is safer; and simultaneously, the working intensity of operators is reduced.
The invention provides an automatic pressure test system for hydrogenation station equipment, which specifically comprises:
the device comprises an air compressor, pressure test equipment, a first air bottle, a second air bottle, an air drive pump, a first pressure transmitter and a second pressure transmitter; the air compressor is connected to a driving inlet of the air driving pump through an air path pipeline and a third electromagnetic valve; after the air is pressurized by an air compressor, driving air required by an air-driven pump is provided; the first gas bottle is connected to an air inlet of the air drive pump through an air path pipeline and a fourth electromagnetic valve; the second gas cylinder is connected to an air inlet of the air drive pump through a gas path pipeline and a fifth electromagnetic valve; the first gas bottle is connected with the pressure test equipment through a gas path pipeline and a first electromagnetic valve; the second gas cylinder is connected with the pressure test equipment through a gas path pipeline and a second electromagnetic valve; a hydrogen outlet of the gas drive pump is connected with the pressure test equipment through a gas path pipeline and a seventh electromagnetic valve; the pressure test equipment is connected with an external safety position through a gas circuit pipeline and a sixth electromagnetic valve.
Further, the first gas cylinder is connected with a first pressure transmitter; the second gas cylinder is connected with a second pressure transmitter; the first pressure transmitter is used for detecting the air pressure of the first air bottle; the second pressure transmitter is used for detecting the air pressure of the second air bottle; and the third pressure transmitter is used for detecting the air pressure of the pressure testing equipment.
Further, the first gas cylinder and the second gas cylinder store pressure test gas sources;
further, the pressure testing equipment comprises four external interfaces, namely 3/4 connection, 9/16 connection, 3/8C & T taper thread connection and 3/4 double-ferrule connection.
Further, the first gas cylinder and the second gas cylinder have two gas supply modes:
the first method comprises the following steps: a pressure test air source is directly provided for the pressure test equipment through the first electromagnetic valve or the second electromagnetic valve; and the second method comprises the following steps: after being pressurized by the gas drive pump, the pressure testing device provides a pressure testing gas source for the pressure testing equipment.
Further, the pressure testing equipment includes three kinds of automatic pressure testing modes, is respectively: a gas pressure test mode, an air tightness test mode and a leakage test mode.
Further, the automatic pressure test system also comprises a controller; the controller is used for receiving pressure signals of the first pressure transmitter, the second pressure transmitter and the third pressure transmitter and controlling the opening and closing of all the electromagnetic valves.
The air pressure test mode comprises the following specific processes:
s101: presetting pressure testing pressure by the controllerP set Closing all the electromagnetic valves;
s102: the controller detects the pressure values of the first pressure transmitter and the second pressure transmitterP 1 AndP 2 (ii) a If it isP 1 >P 2>P 0 Selecting a first air bottle as a pressure testing air source; if it isP 2 ≥P 1>P 0 Selecting a second gas cylinder as a pressure testing gas source; whereinP 0 To try outA standard pressure value for starting the gas drive pump is preset in the pressure stage;
s103: when a first air bottle is selected as a pressure test air source, the controller opens the first electromagnetic valve, and the pressure of the pressure test equipment is continuously increased; when the third pressure transmitter detects the pressure valueP 3 Reach a preset first test threshold valueP a When the first electromagnetic valve is closed, closing the first electromagnetic valve; or when saidP 1 AndP 3 the absolute value of the difference between the two is less than a preset first difference threshold valueP t1 When the pressure sensor detects the pressure value, the first electromagnetic valve is closed, the third electromagnetic valve, the fourth electromagnetic valve and the seventh electromagnetic valve are opened, and an air compressor is used for providing driving force for the air drive pump until the pressure value detected by the third pressure transmitterP 3 Reach a preset first test threshold valueP a Closing the third electromagnetic valve, the fourth electromagnetic valve and the seventh electromagnetic valve;
s104: pressure maintaining deviceT 1 Time, again obtaining the pressure value of the third pressure transmitterP 3 (ii) a If the pressure values detected by the third pressure transmitter in the previous and subsequent times are equal, the step S105 is entered, otherwise, the controller gives an alarm, and the air pressure test mode is ended;T 1 is a preset value;
s105: the controller detects the pressure values of the first pressure transmitter and the second pressure transmitter againP 1 AndP 2 if, ifP 1 >P 2 >P 0 Selecting a first gas cylinder as a pressure testing gas source; if it isP 2 ≥P 1>P 0 Selecting a second gas cylinder as a pressure testing gas source;
s106: when the first air bottle is selected as a pressure test air source, the controller pairP 1 AndP 3 making a difference whenP 1 AndP 3 the absolute value of the difference between the two is larger than a preset first difference threshold valueP t1 When the first electromagnetic valve is opened for useThe first gas cylinder is used for pressurizing the pressure testing equipment, and when the pressure testing equipment is pressurizedP 1 AndP 3 the absolute value of the difference between the two is less than a preset second difference threshold valueP t2 When the pressure sensor detects the pressure value, the first electromagnetic valve is closed, the third electromagnetic valve, the fourth electromagnetic valve and the seventh electromagnetic valve are opened, the air compressor is used for providing driving force for the air-driven pump, and the pressure value is detected by the third pressure transmitterP 3 Reach a preset second test thresholdP b Closing the third electromagnetic valve, the fourth electromagnetic valve and the seventh electromagnetic valve;
s107: pressure maintaining deviceT 1 Time, again obtaining the pressure value of the third pressure transmitterP 3 (ii) a If the pressure values detected by the third pressure transmitter in the previous and subsequent times are equal, the step S108 is entered, otherwise, the controller gives an alarm, and the air pressure test mode is ended;
s108: the controller detects the pressure values of the first pressure transmitter and the second pressure transmitter againP 1 AndP 2 if, ifP 1 <P 2 <P 0 And then opening a third electromagnetic valve, a fourth electromagnetic valve and a seventh electromagnetic valve, and using the first gas cylinder as a pressure testing gas source until the detection pressure value of the third pressure transmitterP 3 Reaching a preset third test thresholdP c Closing the third electromagnetic valve, the fourth electromagnetic valve and the seventh electromagnetic valve; whereinP 0 A standard pressure value for starting the gas drive pump is preset for a pressure test stage;
s109: pressure maintaining deviceT 1 Time, again obtaining the pressure value of the third pressure transmitterP 3 (ii) a If the pressure values detected by the third pressure transmitter in the previous and subsequent times are equal, the step S110 is entered, otherwise, the controller gives an alarm, and the air pressure test mode is ended;
s110: repeating the steps S108 to S109 until the detection pressure value of the third pressure transmitterP 3 Respectively reach a preset fourth test threshold valueP d Fifth test thresholdValue ofP e Sixth test thresholdP f And preset pressure of pressure testP set ；
S111: and after the air pressure test mode is finished, the controller opens the sixth electromagnetic valve for pressure relief, so that the pressure value of the third pressure transmitterP 3 Is within a safe range.
Further, the airtightness test mode specifically includes the following steps:
s201: presetting pressure testing pressure by the controllerP set Closing all the electromagnetic valves;
s202: the controller detects the pressure values of the first pressure transmitter and the second pressure transmitterP 1 AndP 2 (ii) a If it isP 0 >P 2 >P 1 Then the third electromagnetic valve, the fourth electromagnetic valve and the seventh electromagnetic valve are opened, the first gas cylinder is used as a pressure testing gas source until the detection pressure value of the third pressure transmitterP 3 Reach the preset pressure of pressure testP set Closing the third electromagnetic valve, the fourth electromagnetic valve and the seventh electromagnetic valve; if it isP 0 >P 1 ≥P 2 Opening the third electromagnetic valve, the fifth electromagnetic valve and the seventh electromagnetic valve, using the second gas cylinder as a pressure testing gas source until the detection pressure value of the third pressure transmitterP 3 Reach the preset pressure of pressure testP set Closing the third electromagnetic valve, the fifth electromagnetic valve and the seventh electromagnetic valve;
s203: pressure maintaining deviceT 2 Time, again obtaining the pressure value of the third pressure transmitterP 3 (ii) a If the pressure values detected by the third pressure transmitter in the two times are equal, opening a sixth electromagnetic valve for pressure relief until the pressure value of the third pressure transmitter is equalP 3 If the value is 0, otherwise, the controller gives an alarm, and the air tightness test mode is ended;T 2 is a preset value;
s204: the controller detects the first pressurePressure values of a force transmitter and a second pressure transmitterP 1 AndP 2 if, ifP 1 >P 2 >P 0Then, the first electromagnetic valve is opened, and the first air bottle is used for direct pressurization to the pressure value of the third pressure transmitterP 3 Reach a preset first difference threshold valueP t1 Closing the first electromagnetic valve;
s205: pressure maintaining deviceT 2 Time, again obtaining the pressure value of the third pressure transmitterP 3 (ii) a If the pressure values detected by the third pressure transmitter in the two times are equal, opening a sixth electromagnetic valve for pressure relief until the pressure value of the third pressure transmitter is equalP 3 When the value is 0, the airtightness test mode is ended; otherwise, the controller gives an alarm, and the air tightness test mode is ended.
The leakage test mode is as follows:
s301: presetting pressure testing pressure by the controllerP set Closing all the electromagnetic valves;
s302: the controller detects the pressure values of the first pressure transmitter and the second pressure transmitterP 1 AndP 2 if, ifP 0 >P 2 >P 1 Then, the third electromagnetic valve, the fourth electromagnetic valve and the seventh electromagnetic valve are opened, and the first gas cylinder is used as a pressure testing gas source until the detection pressure value of the third pressure transmitterP 3 Reach the preset pressure of pressure testP set Closing the third electromagnetic valve, the fourth electromagnetic valve and the seventh electromagnetic valve;
s303: pressure maintaining deviceT 3 Time, leak rate was calculated as follows:
A=100/t*（1-p 2 *h 1 /p 1 *h 2 ）
wherein the content of the first and second substances,ttime calculated from the start of the dwell, unit: h;p 1 、p 2 for the start of pressure holding andta reading of the second pressure transmitter;h 1 、h 2 for the start of pressure holding andta reading of the first pressure transmitter;
s304: when each measurement is madeAWhen the leakage rate is smaller than the preset lower limit of the leakage rate, the leakage test is qualified, and the step S305 is entered; when the leakage rate exceeds the preset lower limit any time, the controller gives an alarm, and the leakage test is finished;
s305: opening a sixth electromagnetic valve for pressure relief until the pressure value of the third pressure transmitterP 3 At 0, the leak test mode ends.
The beneficial effects provided by the invention are as follows: through the gas cylinder switching logic, the control logic of the electromagnetic valve and the pressure transmitter, the automatic pressure test process of the hydrogenation station equipment is realized, and the safety of personnel and the operability of the process are fully ensured.
Drawings
FIG. 1 is a block diagram of an automatic pressure test system for a hydrogen station apparatus of the present invention;
in the figure: 1-an air compressor; 2-pressure testing equipment; 3-a first gas cylinder; 4-a second gas cylinder; 5-gas drive pump; 6-a first pressure transmitter; 7-a second pressure transmitter; 8-a first solenoid valve; 9-a second solenoid valve; 10-a third solenoid valve; 11-a fourth solenoid valve; 12-a fifth solenoid valve; 13-a sixth solenoid valve; 14-a seventh solenoid valve; 15-a third pressure transmitter;
fig. 2 is a structural view of an automatic pressure test system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, an automatic pressure test system for a hydrogen filling station device includes the following components:
the device comprises an air compressor 1, a pressure test device 2, a first air bottle 3, a second air bottle 4, an air driving pump 5, a first pressure transmitter 6 and a second pressure transmitter 7; the air compressor 1 is connected to a driving inlet of the air driving pump 5 through an air path pipeline and a third electromagnetic valve 10; after the air is pressurized by the air compressor 1, the air provides driving air required by the air-driven pump 5; the first gas cylinder 3 is connected to an air inlet of the air drive pump 5 through a gas pipeline and a fourth electromagnetic valve 11; the second gas cylinder 4 is connected to the gas inlet of the gas drive pump 5 through a gas pipeline and a fifth electromagnetic valve 12; the first gas cylinder 3 is connected with the pressure test equipment 2 through a gas path pipeline and a first electromagnetic valve 8; the second gas cylinder 4 is connected with the pressure test equipment 2 through a gas pipeline and a second electromagnetic valve 9; a hydrogen outlet of the gas drive pump 5 is connected with the pressure test equipment 2 through a gas pipeline and a seventh electromagnetic valve 14; the pressure test equipment 2 is connected with an external safety position through an air pipeline and a sixth electromagnetic valve 13.
The first gas bottle 3 is connected with a first pressure transmitter 6; the second gas cylinder 4 is connected with a second pressure transmitter 7; the first pressure transmitter 6 is used for detecting the air pressure of the first air bottle 3; the second pressure transmitter 7 is used for detecting the air pressure of the second air bottle 4; the third pressure transmitter 15 is used to detect the air pressure of the pressure test device 2.
The first gas cylinder 3 and the second gas cylinder 4 store pressure testing gas sources; preferably, the pressure testing gas source may be a gas such as nitrogen, helium, etc., and is not limited herein. The following description will be given by taking nitrogen as an example.
Regarding the first gas cylinder 3 and the second gas cylinder 4, two gas cylinders are used for preventing the single gas cylinder from causing test interruption when the pressure does not meet the requirement in the test process; the two gas cylinders are directly charged when the pressure is high and meets the set requirement, and the gas cylinders with low pressure are firstly utilized for pressurization when the pressure does not meet the set requirement, so that high-pressure nitrogen is fully utilized without additional energy supply;
the two gas cylinders determine a pressurizing mode and a pressure testing gas source according to the standard pressure and the self pressure of the current test stage, and the specific use rule is as follows:
if the air pressure of the two air cylinders is detected to be higher than the standard pressure of the current stage in the pressure test experiment, the air cylinder with higher air pressure in the two air cylinders is used as a pressure test air source, and the pressure is charged in a direct charging mode;
for example, the standard pressure of the current stage is 5Mpa, the air pressures of the first air cylinder 3 and the second air cylinder 4 are both higher than the standard pressure of the current stage, the air pressure of the first air cylinder 3 is 10Mpa, the air pressure of the second air cylinder 4 is 8Mpa, and the air pressure of the first air cylinder 3 is higher than the air pressure of the second air cylinder 4, under such a condition, the first air cylinder 3 is selected as a pressure test air source, the pressure is charged by adopting a direct charging mode (because the pressure is higher than the standard pressure of the current stage), the first electromagnetic valve 8 is opened, and the pressure is increased for the pressure test equipment;
when the first gas cylinder 3 is pressurized in a direct charging mode, the pressure in the first gas cylinder 3 is gradually reduced, and the relative pressure between the first gas cylinder 3 and the second gas cylinder 4 is changed;
for example, after the pressurization in the current stage is completed, the pressure of the first gas cylinder 3 is reduced to 4Mpa, and at this time, the pressure of the second gas cylinder 4 is greater than the pressure of the first gas cylinder 3 and is higher than the standard pressure of the current stage by 5Mpa, so that when the pressurization is performed in the next stage, the gas cylinders are switched, the second gas cylinder 4 is used as a pressure test gas source, and the pressurization is still performed in a direct pressurization manner; meanwhile, because the pressure of the first gas cylinder 3 is lower than the standard pressure, the controller gives an alarm to remind the first gas cylinder 3 of low pressure and timely replacement.
It should be particularly noted that during the phase charging, the switching between the first gas cylinder 3 and the second gas cylinder 4 is not switched in real time according to the relative pressure between the two gas cylinders; for example, before the current stage begins, the first gas cylinder 3 is selected as a pressure test gas source, so that gas cylinder switching cannot occur in the process of the pressurizing stage, and only the gas cylinder selected before is always adopted as the pressure test gas source; the time for switching the gas cylinders is only after the current pressurizing stage is finished and the pressurizing is finished, the pressure between the two gas cylinders is judged again, and therefore the gas cylinder with relatively high pressure is selected as a pressure testing gas source.
In addition, during the pressurizing stage, if the pressure of the gas cylinder as the pressure testing gas source is reduced to 0, the preset pressure value may not be reached during the pressurizing stage, and the controller will automatically alarm, which is described above.
For the pressurization mode of the gas-driven pump, due to the pressure limitation of the nitrogen cylinder, for example, in the application, the maximum pressure of the nitrogen cylinder is 20Mpa, and in other stages of the pressure test, the requirement on the pressure is continuously increased, for example, in a certain intermediate stage, the pressure is required to be increased to 30Mpa, and at the moment, the nitrogen cylinder cannot meet the pressure increase requirement, and then the pressure is increased in a form of the gas-driven pump;
in the pressure boosting stage of the gas drive pump, one gas cylinder with relatively low pressure is selected as a pressure testing gas source; for example, the pressure of the first gas cylinder 3 is 15Mpa, the pressure of the second gas cylinder 4 is 10Mpa, the second gas cylinder 4 is selected as a pressure test gas source at the moment, and the gas is pressurized in a gas drive pump mode, namely, the third electromagnetic valve 10, the fifth electromagnetic valve 12 and the seventh electromagnetic valve 14 are opened.
The pressure testing equipment comprises four external interfaces which are 3/4 connection, 9/16 connection, 3/8C & T cone thread connection and 3/4 double-sleeve connection respectively.
The first gas cylinder and the second gas cylinder have two gas supply modes:
the first method comprises the following steps: a pressure test air source is directly provided for the pressure test equipment through the first electromagnetic valve 8 or the second electromagnetic valve 9; and the second method comprises the following steps: after being pressurized by the gas drive pump 5, the pressure testing device 2 is provided with a pressure testing gas source.
The pressure test equipment includes three kinds of automatic pressure test modes, is respectively: a gas pressure test mode, an air tightness test mode and a leakage test mode.
The automatic pressure test system also comprises a controller; the controller is used for receiving the pressure signals of the first pressure transmitter 6, the second pressure transmitter 7 and the third pressure transmitter 15 and controlling the opening and closing of all the electromagnetic valves.
The air pressure test mode comprises the following specific processes:
s101: presetting pressure testing pressure by the controllerP set Closing all the electromagnetic valves;
s102: the controller detects the pressure values of the first pressure transmitter 6 and the second pressure transmitter 7P 1 AndP 2 (ii) a If it isP 1 >P 2>P 0 Selecting the first gas cylinder 3 as a pressure testing gas source; if it isP 2 ≥P 1>P 0 Selecting the second gas cylinder 4 as a pressure testing gas source; whereinP 0 A standard pressure value for starting the gas drive pump is preset for a pressure test stage;
s103: when the first gas cylinder 3 is selected as a pressure test gas source, the controller opens the first electromagnetic valve 8, and the pressure of the pressure test equipment 2 is continuously increased; when the third pressure transmitter 15 detects a pressure valueP 3 Reach a preset first test threshold valueP a When so, closing the first electromagnetic valve 8; or when saidP 1 AndP 3 the absolute value of the difference between the two is less than a preset first difference threshold valueP t1 When the pressure sensor is used, the first electromagnetic valve 8 is closed, the third electromagnetic valve 10, the fourth electromagnetic valve 11 and the seventh electromagnetic valve 14 are opened, and the air compressor 1 is used for providing driving force for the air drive pump 5 until the pressure value detected by the third pressure transmitter 15P 3 Reach a preset first test threshold valueP a And closing the third solenoid valve 10, the fourth solenoid valve 11 and the seventh solenoid valve 14;
s104: pressure maintaining deviceT 1 Time, the pressure value of the third pressure transmitter 15 is acquired againP 3 (ii) a If the pressure values detected by the third pressure transmitter 15 in the previous and subsequent times are equal, the step S105 is entered, otherwise, the controller gives an alarm, and the air pressure test mode is ended;T 1 is a preset value;
s105: the controller again detects the pressure values of said first 6 and second 7 pressure transmittersP 1 AndP 2 if, ifP 1 >P 2 >P 0 Selecting a first gas cylinder 3 as a pressure testing gas source; if it isP 2 ≥P 1>P 0 Selecting the second gas cylinder 4 as a pressure testing gas source;
s106: selecting the first cylinder 3 as a testWhen the air source is pressurized, the controller pairP 1 AndP 3 making a difference whenP 1 AndP 3 the absolute value of the difference between the two is larger than a preset first difference threshold valueP t1 When the pressure test device 2 is pressurized, the first electromagnetic valve 8 is opened, and the first gas cylinder 3 is used for pressurizing the pressure test device 2P 1 AndP 3 the absolute value of the difference between the two is less than a preset second difference threshold valueP t2 When the pressure value is detected by the third pressure transmitter 15, the first electromagnetic valve 8 is closed, the third electromagnetic valve 10, the fourth electromagnetic valve 11 and the seventh electromagnetic valve 14 are opened, and the air compressor 1 is used for providing driving force for the air drive pump 5 until the pressure value is detected by the third pressure transmitter 15P 3 Reach a preset second test thresholdP b And closing the third solenoid valve 10, the fourth solenoid valve 11 and the seventh solenoid valve 14;
s107: pressure maintaining deviceT 1 Time, the pressure value of the third pressure transmitter 15 is acquired againP 3 (ii) a If the pressure values detected by the third pressure transmitter 15 in the previous and subsequent times are equal, the step S108 is entered, otherwise, the controller gives an alarm, and the air pressure test mode is ended;
s108: the controller again detects the pressure values of said first 6 and second 7 pressure transmittersP 1 AndP 2 if, ifP 1 <P 2 <P 0 And then the third electromagnetic valve 10, the fourth electromagnetic valve 11 and the seventh electromagnetic valve 14 are opened, and the first gas cylinder 3 is used as a pressure testing gas source until the detection pressure value of the third pressure transmitter 15P 3 Reaching a preset third test thresholdP c And closing the third solenoid valve 10, the fourth solenoid valve 11 and the seventh solenoid valve 14; whereinP 0 A standard pressure value for starting the gas drive pump is preset for a pressure test stage;
s109: pressure maintaining deviceT 1 Time, the pressure value of the third pressure transmitter 15 is acquired againP 3 (ii) a If the third pressure transmitter 15 detects twice before and afterIf the pressure values are equal, the step S110 is entered, otherwise, the controller gives an alarm, and the air pressure test mode is ended;
s110: repeating the steps S108 to S109 until the detection pressure value of the third pressure transmitter 15P 3 Respectively reach a preset fourth test threshold valueP d Fifth test thresholdP e Sixth test thresholdP f And preset pressure of pressure testP set ；
S111: when the air pressure test mode is finished, the controller opens the sixth electromagnetic valve 13 to release the pressure, so that the pressure value of the third pressure transmitter 15 is enabledP 3 Is within a safe range.
The air tightness test mode specifically comprises the following steps:
s201: presetting pressure testing pressure by the controllerP set Closing all the electromagnetic valves;
s202: the controller detects the pressure values of the first pressure transmitter 6 and the second pressure transmitter 7P 1 AndP 2 (ii) a If it isP 0 >P 2 >P 1 And then the third electromagnetic valve 10, the fourth electromagnetic valve 11 and the seventh electromagnetic valve 14 are opened, the first gas cylinder 3 is used as a pressure testing gas source until the detection pressure value of the third pressure transmitter 15P 3 Reach the preset pressure of pressure testP set And closing the third solenoid valve 10, the fourth solenoid valve 11 and the seventh solenoid valve 14; if it isP 0 >P 1 ≥P 2 And opening the third electromagnetic valve 10, the fifth electromagnetic valve 12 and the seventh electromagnetic valve 14, and using the second gas cylinder 4 as a pressure test gas source until the detection pressure value of the third pressure transmitter 15P 3 Reach the preset pressure of pressure testP set And closing the third solenoid valve 10, the fifth solenoid valve 12 and the seventh solenoid valve 14;
s203: pressure maintaining deviceT 2 Time, the pressure value of the third pressure transmitter 15 is acquired againP 3 (ii) a If it is frontIf the pressure values detected by the third pressure transmitter 15 in the last two times are equal, the sixth electromagnetic valve 13 is opened to release the pressure until the pressure value of the third pressure transmitter 15 is equalP 3 If the value is 0, otherwise, the controller gives an alarm, and the air tightness test mode is ended;T 2 is a preset value;
s204: the controller detects the pressure values of the first pressure transmitter 6 and the second pressure transmitter 7P 1 AndP 2 if, ifP 1 >P 2 >P 0 Then, the first solenoid valve 8 is opened, and the first gas cylinder 3 is used for direct pressurization to the pressure value of the third pressure transmitter 15P 3 Reach a preset first difference threshold valueP t1 And closing the first solenoid valve 8;
s205: pressure maintaining deviceT 2 Time, the pressure value of the third pressure transmitter 15 is acquired againP 3 (ii) a If the pressure values detected by the third pressure transmitter 15 in the two previous and subsequent times are equal, the sixth electromagnetic valve 13 is opened to release the pressure until the pressure value of the third pressure transmitter 15 is equalP 3 When the value is 0, the airtightness test mode is ended; otherwise, the controller gives an alarm, and the air tightness test mode is ended.
The leakage test mode is as follows:
s301: presetting pressure testing pressure by the controllerP set Closing all the electromagnetic valves;
s302: the controller detects the pressure values of the first pressure transmitter 6 and the second pressure transmitter 7P 1 AndP 2 if, ifP 0 >P 2 >P 1 Then, the third solenoid valve 10, the fourth solenoid valve 11 and the seventh solenoid valve 14 are opened, and the first gas cylinder 3 is used as a pressure testing gas source until the detection pressure value of the third pressure transmitter 15P 3 Reach the preset pressure of pressure testP set And closing the third solenoid valve 10, the fourth solenoid valve 11 and the seventh solenoid valve 14;
s303: pressure maintaining deviceT 3 Time, leak rate was calculated as follows:
A=100/t*（1-p 2 *h 1 /p 1 *h 2 ）
wherein the content of the first and second substances,ttime calculated from the start of the dwell, unit: h;p 1 、p 2 for the start of pressure holding andtthe reading of the second pressure transmitter 7;h 1 、h 2 for the start of pressure holding andta reading of the first pressure transmitter 6;
s304: when each measurement is madeAWhen the leakage rate is smaller than the preset lower limit of the leakage rate, the leakage test is qualified, and the step S305 is entered; when the leakage rate exceeds the preset lower limit any time, the controller gives an alarm, and the leakage test is finished;
s305: opening the sixth electromagnetic valve 13 for pressure relief until the pressure value of the third pressure transmitter 15P 3 At 0, the leak test mode ends.
For a better understanding of the present application, the present invention provides an example of the field at a hydrogen station as follows:
referring to fig. 2, fig. 2 is a structural diagram of an automatic pressure testing system according to an embodiment of the present invention;
fig. 2 is an automatic pressure test pipeline system for performing pressure test and air tightness test on hydrogenation station equipment, and conforms to the technical specification of the hydrogenation station of GB 50516. By adding the electromagnetic valve and the pressure transmitter in the system and setting intelligent logic control, the opening and closing of the electromagnetic valve and the starting and stopping of the equipment are controlled, the automatic pressure test process of the system is realized, and the safety of personnel and the operability of the process are fully ensured;
in fig. 2, the specific structural parts of the air-driven pump and the air compressor are not the core content of the present application, and as for the air-driven pump, other types of air-driven pumps can be selected, which is not limited herein;
the system is suitable for an automatic pressure test process of equipment with the design pressure of less than 50 MPa, is divided into an air pressure test mode, an air tightness test mode and a leakage test mode, and simultaneously comprises any two or three test combined carrying modes.
After entering the automatic pressure test process, the design pressure is input into the interface, and the system automatically calculates the pressure value of each step.
According to the size and the connection form of the current equipment of the hydrogenation station, the automatic pressure test system designs four equipment interfaces, namely 3/4 ', 9/16', 3/8 'C & T cone thread connection and 3/4' double-ferrule connection.
The air-driven pump takes 0.8MPa of air as driving gas, the air is pressurized to 0.8MPa by an air compressor, and a nitrogen cylinder with the highest pressure of 20MPa provides pressure testing gas for the system.
The system is provided with two nitrogen cylinders as air sources, wherein the nitrogen cylinder with high pressure is selected as the air source in the direct charging stage, and the nitrogen cylinder with low pressure is selected as the air source in the boosting stage of the gas drive pump.
Taking a 49.5MPaG (design pressure) device as an example, the operation steps of the control system are as follows according to the sequence of a gas pressure test, an air tightness test and a leakage test:
TABLE 1 test procedure
In Table 1, 54.45MpaG is 1.1 times the design pressure, which is the standard specification.
Before pressure testing begins, pressure testing equipment is connected to a rear pipeline of a needle valve HNV-101, and a valve needle valve HNV-105, a needle valve HNV-106, a needle valve HNV107 and a needle valve HNV-101 are opened.
Selecting an air pressure test mode, and inputting a design pressure of 49.5MPa on an interface (corresponding to the controller in the previous step);
(1) after entering the mode, the system firstly detects data of the pressure transmitter PT-101 and the pressure transmitter PT-102, and if the data of the pressure transmitter PT-101 is high, the solenoid valve SOV-101 is opened and the gas cylinder 1 is used until the pressure transmitter PT-103 reaches 5.445MPa, and the solenoid valve SOV-101 is closed, or the difference value between the pressure transmitter PT-101 and the pressure transmitter PT-103 is smaller than 2MPa, the solenoid valve SOV-101 is closed, the solenoid valve SOV-107, the solenoid valve SOV-103 and the solenoid valve SOV-105 are opened, and an air compressor is used for providing power for the air drive pump until the pressure transmitter PT-103 reaches 5.445MPa, and the solenoid valve SOV-105 is closed and the SOV-107 and the SOV-103 are closed at the same time.
(2) After the 10% stage is reached, the system is kept for 5min, the pressure at the beginning and the pressure at the end of the stage are compared before the end, when the pressure is equal to the pressure at the end of the stage, the system enters the next step, and when the pressure is different from the pressure at the beginning, an alarm is displayed on a system interface and the system stops pressure testing;
(3) after the pressure maintaining is finished for 5min, the system detects data of the pressure transmitter PT-101 and the pressure transmitter PT-102 again, if the data of the pressure transmitter PT-101 is high, a difference value is made between the pressure transmitter PT-101 and the pressure transmitter PT-103, if the difference value is not less than 2MPa, the solenoid valve SOV-101 is opened, the equipment is pressurized by using the gas cylinder 1, when the difference value between the pressure transmitter PT-103 and the pressure transmitter PT-101 is less than 5MPa, the solenoid valve SOV-101 is closed, the solenoid valve SOV-107, the solenoid valve SOV-103 and the solenoid valve SOV-105 are opened, the air compressor is used for providing power for the air drive pump, the gas cylinder 1 is used as a pressure testing gas source until the pressure transmitter PT-103 reaches 27.225MPa, the solenoid valve SOV-105 is closed, and the SOV-107 and the SO.
(4) After the 50% stage is reached, the system is kept for 5min, the pressure at the beginning and the pressure at the end of the stage are compared before the end, when the pressure is equal to the pressure at the end of the stage, the system enters the next step, and when the pressure is different from the pressure at the end of the stage, an alarm is displayed on a system interface and the system stops pressure testing;
(5) after 5min pressure holding is finished, the system detects data of the pressure transmitter PT-101 and the pressure transmitter PT-102 again, if the data of the pressure transmitter PT-102 is high, the solenoid valve SOV-107, the solenoid valve SOV-103 and the solenoid valve SOV-105 are opened, the air compressor is used for providing power for the air drive pump, the air bottle 1 is used as a pressure testing air source until the pressure transmitter PT-103 reaches 27.225MPa, and the solenoid valve SOV-105 is closed while the SOV-107 and the SOV-103 are closed.
(6) After reaching 60% stage, the system is kept for 5min, the difference value of the starting pressure and the ending pressure is made before ending, the set value of the system is exceeded, and an alarm is displayed on a system interface;
(7) and 7, repeating the steps 7 and 8 to finish the pressure test stages of 70%, 80%, 90% and 100%.
(8) After the pressure test is finished, the system automatically opens the solenoid valve SOV-106, the pressure is reduced by the flow limiting pore plate and then is emptied, and the solenoid valve SOV-106 is closed when the pressure of the pressure transmitter PT-103 is reduced to the design pressure of 49.5MPa
The air pressure test is finished, the click interface enters the air tightness test or the air is emptied (the SOV106 is opened) to finish the test.
If entering the air-tight test, the method specifically includes the following steps (taking a combined test as an example here, i.e. firstly performing an air pressure test, then performing the air-tight test, and correspondingly, selecting an individual test, i.e. an individual air-tight test or an individual air pressure test):
(1) because the solenoid valve can not accurately control the pressure, the system detects the data of the pressure transmitter PT-101 and the pressure transmitter PT-102 again, if the data of the pressure transmitter PT-102 is high, the solenoid valve SOV-107, the solenoid valve SOV-103 and the solenoid valve SOV-105 are opened, the air compressor is used for providing power for the air drive pump, the air bottle 1 is used as a pressure testing air source, and until the pressure transmitter PT-103 reaches 49.5MPa, the solenoid valve SOV-105 is closed, and the SOV-107 and the SOV-103 are closed at the same time.
(2) Maintaining the pressure for 30min, comparing the pressures at the beginning and the end of the stage before the end, automatically opening the solenoid valve SOV-106 by the system when the pressures are equal to each other, reducing the pressure by the flow-limiting orifice plate, emptying until the pressure is zero, and displaying an alarm on a system interface and stopping the test by the system when the pressure is different from the pressure;
(3) the system detects data of a pressure transmitter PT-101 and a pressure transmitter PT-102, and if the data of the pressure transmitter PT-101 is high, the solenoid valve SOV-101 is opened, the gas cylinder 1 is used, and the solenoid valve SOV-101 is closed when the pressure transmitter PT-103 reaches 2 MPa;
(4) maintaining the pressure for 30min, comparing the pressures at the beginning and the end of the stage before the end, automatically opening the solenoid valve SOV-106 by the system when the pressures are equal to each other, reducing the pressure by the flow-limiting orifice plate, emptying until the pressure is zero, and displaying an alarm on a system interface and stopping the test by the system when the pressure is different from the pressure;
and the air tightness test is finished, and the click interface enters the leakage test or the air is selected to be emptied (the SOV106 is opened) to finish the test.
If the leakage test is continuously carried out, the method specifically comprises the following steps:
(1) the system detects the data of the pressure transmitter PT-101 and the pressure transmitter PT-102 again, and if the data of the pressure transmitter PT-102 is high, the solenoid valve SOV-107, the solenoid valve SOV-103 and the solenoid valve SOV-105 are opened, the air compressor is used for providing power for the air drive pump, the air bottle 1 is used as a pressure testing air source until the pressure transmitter PT-103 reaches 49.5MPa, and the solenoid valve SOV-105 is closed and the SOV-107 is closed at the same time.
(2) The system was held for 24h and the leak rate a was calculated per hour according to the formula a =100/T (1-P2T 1/P1T 2), where T is the time calculated from the start of the hold pressure in units: h; p1 and P2 are PT-102 readings at the beginning of pressure maintaining and at t; t1, T2 are TI-101 readings at the beginning of the dwell and at T; when A measured in each time is less than 0.5%, the test is qualified, and when A measured in any time is not less than 0.5%, the test is stopped.
The invention has the beneficial effects that: three automatic pressure testing modes are designed, and switching logic between two gas cylinders is adopted, so that the automatic pressure testing process of the hydrogenation station equipment is realized, and the safety of personnel and the operability of the process are fully ensured.
The innovation points of the invention are as follows: the implementation of switching logic between gas cylinders, automatic control logic of the process (combination and switching between three modes) and process automation processes (setting of solenoid valves and pressure transmitters); the invention aims at complex equipment of a hydrogenation station, can also be applied to other hydrogenation fields such as vehicle-mounted hydrogenation fields after being simplified, and is not used for limiting in any way.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The utility model provides an automatic pressure testing system to hydrogenation station equipment which characterized in that: the method comprises the following steps:
the pressure testing device comprises an air compressor (1), pressure testing equipment (2), a first air bottle (3), a second air bottle (4), an air-driven pump (5), a first pressure transmitter (6) and a second pressure transmitter (7);
the air compressor (1) is connected to a driving inlet of the air driving pump (5) through an air channel pipeline and a third electromagnetic valve (10); after the air is pressurized by the air compressor (1), the air provides driving air required by the air-driven pump (5);
the first gas cylinder (3) is connected to an air inlet of the air-driven pump (5) through a gas path pipeline and a fourth electromagnetic valve (11);
the second gas cylinder (4) is connected to an air inlet of the air-driven pump (5) through a gas pipeline and a fifth electromagnetic valve (12);
the first gas bottle (3) is connected with the pressure test equipment (2) through a gas path pipeline and a first electromagnetic valve (8); the second gas cylinder (4) is connected with the pressure test equipment (2) through a gas pipeline and a second electromagnetic valve (9);
a hydrogen outlet of the gas drive pump (5) is connected with the pressure test equipment (2) through a gas pipeline and a seventh electromagnetic valve (14);
the pressure test equipment (2) is connected with an external safety position through a gas path pipeline and a sixth electromagnetic valve (13);
the first gas cylinder (3) is connected with a first pressure transmitter (6); the second gas cylinder (4) is connected with a second pressure transmitter (7);
the pressure test equipment (2) is connected with a third pressure transmitter (15);
the first pressure transmitter (6) is used for detecting the air pressure of the first air bottle (3); the second pressure transmitter (7) is used for detecting the air pressure of the second air bottle (4); the third pressure transmitter (15) is used for detecting the air pressure of the pressure test equipment (2);
the pressure test equipment includes three kinds of automatic pressure test modes, is respectively: a gas pressure test mode, an air tightness test mode and a leakage test mode;
the automatic pressure test system also comprises a controller; the controller is used for receiving pressure signals of the first pressure transmitter (6), the second pressure transmitter (7) and the third pressure transmitter (15) and controlling the opening and closing of all the electromagnetic valves;
the air pressure test mode comprises the following specific processes:
s101: presetting pressure testing pressure by the controllerP set Closing all the electromagnetic valves;
s102: the controller detects the pressure values of the first pressure transmitter (6) and the second pressure transmitter (7)P 1 AndP 2 (ii) a If it isP 1 >P 2>P 0 Selecting the first gas cylinder (3) as a pressure testing gas source; if it isP 2 ≥P 1>P 0 Selecting a second gas cylinder (4) as a pressure testing gas source; whereinP 0 A standard pressure value for starting the gas drive pump is preset for a pressure test stage;
s103: when the first gas cylinder (3) is selected as a pressure test gas source, the controller opens the first electromagnetic valve (8), and the pressure of the pressure test equipment (2) is continuously increased; when the third pressure transmitter (15) detects a pressure valueP 3 Reach a preset first test threshold valueP a When so, closing the first solenoid valve (8); or when saidP 1 AndP 3 the absolute value of the difference between the two is less than a preset first difference threshold valueP t1 When the pressure sensor is used, the first electromagnetic valve (8) is closed, the third electromagnetic valve (10), the fourth electromagnetic valve (11) and the seventh electromagnetic valve (14) are opened, and an air compressor (1) is used for providing driving force for the air drive pump (5) until the pressure value detected by the third pressure transmitter (15)P 3 Reach a preset first test threshold valueP a And closing the third solenoid valve (10), the fourth solenoid valve (11) and the seventh solenoid valve (14);
s104: pressure maintaining deviceT 1 Time, again obtaining the pressure value of the third pressure transmitter (15)P 3 (ii) a If the two times are before and afterIf the pressure values detected by the third pressure transmitter (15) are equal, the step S105 is carried out, otherwise, the controller gives an alarm, and the air pressure test mode is ended;T 1 is a preset value;
s105: the controller detects again the pressure values of the first pressure transmitter (6) and the second pressure transmitter (7)P 1 AndP 2 if, ifP 1 >P 2 >P 0 Selecting the first gas cylinder (3) as a pressure testing gas source, if soP 2 ≥P 1>P 0 Selecting a second gas cylinder (4) as a pressure testing gas source;
s106: when the first gas cylinder (3) is selected as a pressure testing gas source, the controller pairP 1 AndP 3 making a difference whenP 1 AndP 3 the absolute value of the difference between the two is larger than a preset first difference threshold valueP t1 When the pressure test device is used, the first electromagnetic valve (8) is opened, the first gas cylinder (3) is used for pressurizing the pressure test device (2), and when the pressure test device is used, the pressure test device is usedP 1 AndP 3 the absolute value of the difference between the two is less than a preset second difference threshold valueP t2 When the pressure sensor is used, the first electromagnetic valve (8) is closed, the third electromagnetic valve (10), the fourth electromagnetic valve (11) and the seventh electromagnetic valve (14) are opened, the air compressor (1) is used for providing driving force for the air drive pump (5), and the pressure value detected by the third pressure transmitter (15) is up toP 3 Reach a preset second test thresholdP b And closing the third solenoid valve (10), the fourth solenoid valve (11) and the seventh solenoid valve (14);
s107: pressure maintaining deviceT 1 Time, again obtaining the pressure value of the third pressure transmitter (15)P 3 (ii) a If the pressure values detected by the third pressure transmitter (15) in the previous and subsequent times are equal, the step S108 is entered, otherwise, the controller gives an alarm, and the air pressure test mode is ended;
s108: the controller detects again the first pressure transmitter (6) and the second pressurePressure value of transmitter (7)P 1 AndP 2 if, ifP 1 <P 2 <P 0 And then a third electromagnetic valve (10), a fourth electromagnetic valve (11) and a seventh electromagnetic valve (14) are opened, and the first gas cylinder (3) is used as a pressure testing gas source until the detection pressure value of the third pressure transmitter (15)P 3 Reaching a preset third test thresholdP c And closing the third solenoid valve (10), the fourth solenoid valve (11) and the seventh solenoid valve (14);
s109: pressure maintaining deviceT 1 Time, again obtaining the pressure value of the third pressure transmitter (15)P 3 (ii) a If the pressure values detected by the third pressure transmitter (15) in the previous and subsequent times are equal, the step S110 is entered, otherwise, the controller gives an alarm, and the air pressure test mode is ended;
s110: repeating the steps S108 to S109 until the detection pressure value of the third pressure transmitter (15)P 3 Respectively reach a preset fourth test threshold valueP d Fifth test thresholdP e Sixth test thresholdP f And preset pressure of pressure testP set ；
S111: and after the air pressure test mode is finished, the controller opens a sixth electromagnetic valve (13) to release pressure, so that the pressure value of the third pressure transmitter (15) is enabledP 3 Is within a safe range.
2. The automatic pressure testing system for the hydrogen filling station equipment as claimed in claim 1, wherein: the first gas cylinder (3) and the second gas cylinder (4) store pressure testing gas sources.
3. The automatic pressure testing system for the hydrogen filling station equipment as claimed in claim 1, wherein:
the pressure testing equipment comprises four external interfaces which are 3/4 connection, 9/16 connection, 3/8C & T cone thread connection and 3/4 double-sleeve connection respectively.
4. The automatic pressure testing system for the hydrogen filling station equipment as claimed in claim 1, wherein:
the first gas cylinder and the second gas cylinder have two gas supply modes, and the gas supply modes are automatically switched according to the difference of the gas pressures of the first gas cylinder (3) and the second gas cylinder (4) and the testing process;
the first mode is as follows: a pressure test air source is directly provided for the pressure test equipment through the first electromagnetic valve (8) or the second electromagnetic valve (9);
the second mode is as follows: after being pressurized by the gas drive pump (5), the pressure testing device provides a pressure testing gas source for the pressure testing equipment (2).
5. The automatic pressure testing system for the hydrogen filling station equipment as claimed in claim 1, wherein: the air tightness test mode specifically comprises the following steps:
s201: presetting pressure testing pressure by the controllerP set Closing all the electromagnetic valves;
s202: the controller detects the pressure values of the first pressure transmitter (6) and the second pressure transmitter (7)P 1 AndP 2 (ii) a If it isP 0 >P 2 >P 1 And then the third electromagnetic valve (10), the fourth electromagnetic valve (11) and the seventh electromagnetic valve (14) are opened, and the first gas cylinder (3) is used as a pressure testing gas source until the detection pressure value of the third pressure transmitter (15)P 3 Reach the preset pressure of pressure testP set And closing the third solenoid valve (10), the fourth solenoid valve (11) and the seventh solenoid valve (14); if it isP 0 >P 1 ≥P 2 Opening a third electromagnetic valve (10), a fifth electromagnetic valve (12) and a seventh electromagnetic valve (14), and using a second gas cylinder (4) as a pressure testing gas source until the detection pressure value of a third pressure transmitter (15)P 3 Reach the preset pressure of pressure testP set And are closedClosing the third electromagnetic valve (10), the fifth electromagnetic valve (12) and the seventh electromagnetic valve (14);
s203: pressure maintaining deviceT 2 Time, again obtaining the pressure value of the third pressure transmitter (15)P 3 (ii) a If the pressure values detected by the third pressure transmitter (15) at the front and the back are equal, opening a sixth electromagnetic valve (13) for pressure relief until the pressure value of the third pressure transmitter (15) is equalP 3 If the value is 0, otherwise, the controller gives an alarm, and the air tightness test mode is ended;T 2 is a preset value;
s204: the controller detects the pressure values of the first pressure transmitter (6) and the second pressure transmitter (7)P 1 AndP 2 if, ifP 1 >P 2>P 0， The first electromagnetic valve (8) is opened, and the first gas cylinder (3) is directly used for pressurizing to the pressure value of the third pressure transmitter (15)P 3 Reach a preset first difference threshold valueP t1 And closing the first solenoid valve (8);
s205: pressure maintaining deviceT 2 Time, again obtaining the pressure value of the third pressure transmitter (15)P 3 (ii) a If the pressure values detected by the third pressure transmitter (15) at the front and the back are equal, opening a sixth electromagnetic valve (13) for pressure relief until the pressure value of the third pressure transmitter (15) is equalP 3 When the value is 0, the airtightness test mode is ended; otherwise, the controller gives an alarm, and the air tightness test mode is ended.
6. The automatic pressure testing system for the hydrogen filling station equipment as claimed in claim 1, wherein: the leakage test mode is as follows:
s301: presetting pressure testing pressure by the controllerP set Closing all the electromagnetic valves;
s302: the controller detects the pressure values of the first pressure transmitter (6) and the second pressure transmitter (7)P 1 AndP 2 if, ifP 0 >P 2 >P 1 Then, the third electromagnetic valve (10), the fourth electromagnetic valve (11) and the seventh electromagnetic valve (14) are opened, and the first gas cylinder (3) is used as a pressure test gas source until the detection pressure value of the third pressure transmitter (15)P 3 Reach the preset pressure of pressure testP set And closing the third solenoid valve (10), the fourth solenoid valve (11) and the seventh solenoid valve (14);
s303: pressure maintaining deviceT 3 Time, leak rate was calculated as follows:
A=100/t*（1-p 2 *h 1 /p 1 *h 2 ）
wherein the content of the first and second substances,ttime calculated from the start of the dwell, unit: h;p 1 、p 2 for the start of pressure holding andta reading of a second pressure transmitter (7);h 1 、h 2 for the start of pressure holding andta reading of the first pressure transmitter (6);
s304: when each measurement is madeAWhen the leakage rate is smaller than the preset lower limit of the leakage rate, the leakage test is qualified, and the step S305 is entered; when the leakage rate exceeds the preset lower limit any time, the controller gives an alarm, and the leakage test is finished;
s305: opening a sixth electromagnetic valve (13) for pressure relief until the pressure value of the third pressure transmitter (15)P 3 At 0, the leak test mode ends.
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Effective date of registration: 20240403 Address after: Room 901, 9th Floor, No. 1555 Lianhua Road, Minhang District, Shanghai, 202233 Patentee after: SHANGHAI HYFUN ENERGY TECHNOLOGY CO.,LTD. Country or region after: China Address before: 453000 floor 3 and 4, No.11 workshop, Xinxiang hydrogen energy industrial park, northeast corner of the intersection of East Ring Road and South Second Ring Road, Xinxiang City, Henan Province Patentee before: Henan hifeng Energy Technology Co.,Ltd. Country or region before: China Patentee before: SHANGHAI HYFUN ENERGY TECHNOLOGY CO.,LTD. Patentee before: Shandong hifeng Energy Technology Co.,Ltd. |