CN115493774A - Hydrogen rotary joint airtightness testing method and system suitable for low-temperature environment - Google Patents
Hydrogen rotary joint airtightness testing method and system suitable for low-temperature environment Download PDFInfo
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- CN115493774A CN115493774A CN202210946224.6A CN202210946224A CN115493774A CN 115493774 A CN115493774 A CN 115493774A CN 202210946224 A CN202210946224 A CN 202210946224A CN 115493774 A CN115493774 A CN 115493774A
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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
- G01M3/28—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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2853—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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L1/00—Enclosures; Chambers
- B01L1/02—Air-pressure chambers; Air-locks therefor
- B01L1/025—Environmental chambers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/18—Means for temperature control
- B01L2300/1894—Cooling means; Cryo cooling
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Abstract
The invention provides a hydrogen rotary joint airtightness testing system and method suitable for a low-temperature environment, wherein the system comprises an air source, a valve with a pressure reducing function, a pressure gauge, a bypass ball valve, a main path ball valve and a pressure testing root valve; the gas source is connected with the stator end of the tested hydrogen cyclone adapter through a gas supply pipeline, a valve with a pressure reducing function and a main path ball valve are sequentially arranged on the gas supply pipeline, a bypass ball valve is arranged on a bypass between the valve with the pressure reducing function and the main path ball valve, and the main path ball valve is used for cutting off the gas source; a pressure gauge is arranged on an air supply pipeline between the main ball valve and the tested hydrogen cyclone adapter, and a pressure testing root valve is arranged between the pressure gauge and the air supply pipeline; the motor is connected with the rotor end of the tested hydrogen cyclone adapter; the equipment of the hydrogen rotary joint air tightness testing system except the air source is placed in the low-temperature test chamber. The method is suitable for easily-leaked gases such as hydrogen or helium, and is particularly suitable for evaluating the air tightness of the hydrogen rotary joint in a low-temperature environment.
Description
Technical Field
The invention relates to a method and a system for testing air tightness of a hydrogen rotary joint, and belongs to the field of air tightness detection.
Background
Regarding the rotary joint, the existing periodicals and patents are mostly focused on the development of the rotary joint under the working conditions of high temperature, high pressure and high rotating speed or the development of a certain special rotary joint testing device, and regarding the air tightness testing method of the rotary joint, only the current standard is JB/T8725-2013 'rotary joint', which has clear requirements and stipulates: the test media of the static pressure test and the 15min running test adopt oil, antirust water, air or nitrogen, no air leakage, water leakage or oil leakage phenomenon exists, and the test temperature is normal temperature; the test medium of the 5h and 100h operation tests adopts oil or antirust water, when the nominal size is not more than 50mm, the leakage amount is not more than 2mL/h, when the nominal size is more than 50mm, the leakage amount is not more than 4mL/h, the 5h operation test temperature simulates the working condition temperature, and the 10h operation test temperature is normal temperature. For a conventional pneumatic or hydraulic rotary joint, the method is very suitable, but for hydrogen with the smallest natural molecules, oil, antirust water, air or nitrogen are adopted for testing due to the strong seepage property, so that the real leakage condition when the hydrogen is introduced cannot be reflected; oil or antirust water is adopted in the 5h and 100h running tests, water condensation cannot be used in a low-temperature environment, the difference between the viscosity increase of the oil and the airtight property of hydrogen is larger, and the airtight performance of the rotary joint after the hydrogen is introduced cannot be represented.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a method and a system for testing the air tightness of a hydrogen rotary joint in a low-temperature environment, which overcome the defects of the prior art, are suitable for easily leaked gases such as hydrogen or helium and are particularly suitable for evaluating the air tightness of the hydrogen rotary joint in the low-temperature environment.
The technical scheme adopted by the invention is as follows: a hydrogen rotary joint air tightness test system suitable for a low-temperature environment comprises an air source, a valve with a pressure reduction function, a pressure gauge, a bypass ball valve, a main path ball valve and a pressure test root valve;
the gas source is connected with the stator end of the tested hydrogen cyclone adapter through a gas supply pipeline, a valve with a pressure reducing function and a main pipeline ball valve are sequentially arranged on the gas supply pipeline, the valve with the pressure reducing function is used for reducing the pressure of gas in the gas source to a test pressure, a bypass ball valve is arranged on a bypass between the valve with the pressure reducing function and the main pipeline ball valve, and the main pipeline ball valve is used for cutting off the gas source;
a pressure gauge is arranged on an air supply pipeline between the main ball valve and the tested hydrogen cyclone adapter, and a pressure testing root valve is arranged between the pressure gauge and the air supply pipeline; the motor is connected with the rotor end of the tested hydrogen cyclone adapter;
the valve with the pressure reducing function, the pressure gauge, the bypass ball valve, the main path ball valve, the pressure testing root valve, the motor, the tested hydrogen cyclone adapter and the air supply pipeline are placed in the low-temperature test bin.
Further, the gas source is a hydrogen steel cylinder, a hydrogen steel cylinder container grid, a helium steel cylinder or a helium steel cylinder container grid.
Furthermore, a pipe orifice of the rotor end of the tested hydrogen cyclone adapter is plugged, and a pipeline is plugged by adopting a plug, a blind flange or a valve.
Furthermore, the hydrogen rotary joint airtight testing system suitable for the low-temperature environment further comprises a pressure transmitter, and the pressure transmitter is arranged on an air supply pipeline between the main ball valve and the tested hydrogen rotary joint.
A gas tightness test method for a hydrogen rotary joint suitable for a low-temperature environment comprises the following steps:
installing the hydrogen rotary joint air tightness testing system;
adjusting the temperature of the low-temperature test bin to a test temperature, opening an air source after the temperature of the hydrogen cyclone adapter to be tested is consistent with the ambient temperature, adjusting the pressure to a test pressure through a valve with a pressure reduction function, opening a main path ball valve, closing a bypass ball valve, opening a pressure test root valve, loosening a plugging structure of a rotor end of the hydrogen cyclone adapter to be tested, performing helium or hydrogen replacement on an air supply pipeline, closing the main path ball valve after the replacement is finished, and fastening a rotor end plug; opening a main path ball valve, and pressurizing an air supply pipeline; closing the main pipeline ball valve, closing the gas source bottleneck valve, opening the bypass ball valve, evacuating gas in an upstream gas supply pipeline between the gas source and the bypass ball valve, and closing the bypass ball valve after evacuation;
if the static airtight test is carried out, the pipeline pressure and the low-temperature cabin environment temperature at the initial moment are recorded, and the pipeline pressure and the low-temperature cabin environment temperature are recorded at the termination moment to be tested;
if the dynamic airtight test is carried out, the motor is started, the rotating speed and the rotating direction of the motor are set, the pipeline pressure and the low-temperature bin environment temperature at the initial moment are recorded, and the pipeline pressure and the low-temperature bin environment temperature are recorded at the to-be-tested termination moment;
and calculating the leakage rate according to a leakage rate calculation formula, and judging the air tightness of the tested hydrogen cyclone adapter according to the leakage rate.
Further, the installation of the hydrogen gas rotary joint airtightness testing system comprises:
connecting an air source with the stator end of the tested hydrogen cyclone adapter through an air supply pipeline, sequentially arranging a valve with a pressure reducing function and a main pipeline ball valve on the air supply pipeline, and arranging a bypass ball valve on a bypass between the valve with the pressure reducing function and the main pipeline ball valve; a pressure gauge is arranged on an air supply pipeline between the main path ball valve and the tested hydrogen cyclone adapter, and a pressure testing root valve is arranged between the pressure gauge and the air supply pipeline; connecting a motor with a rotor end of the tested hydrogen cyclone adapter;
and placing a valve with a pressure reducing function, a pressure gauge, a bypass ball valve, a main path ball valve, a pressure testing root valve, a motor, a tested hydrogen cyclone adapter and an air supply pipeline in a low-temperature test bin.
Furthermore, a main path ball valve is opened, after the air supply pipeline is pressurized, leakage detection liquid is adopted to detect all joints on the air supply pipeline, and the phenomenon that all joints do not leak is guaranteed.
Further, the leak rate calculation formula is as follows:
wherein: let us be the leak rate; p is 1 、P 2 Absolute pressure values at an initial time and a termination time respectively; t is 1 And T are the absolute temperatures of the initial time and the termination time respectively; and t is the test time.
Further, judge the gas tightness of surveyed hydrogen gas rotary joint according to the leakage rate, include:
if the leakage rate is less than 0.5%, judging that the airtight of the tested hydrogen cyclone adapter is qualified at the set test temperature; and if the leakage rate is greater than or equal to 0.5%, determining that the gas tightness of the tested hydrogen cyclone adapter is not qualified at the set test temperature.
Furthermore, the temperature of the low-temperature test chamber is adjusted according to test requirements, and the simulation of the ambient temperature from normal temperature to minus 30 ℃ can be realized.
Compared with the prior art, the invention has the advantages that:
(1) The method of the invention has wide applicability: the method can be suitable for the air tightness test and air tightness performance judgment of all rotary joints working in low-temperature environments, and is particularly suitable for rotary joints for gas media with strong leakage.
(2) The invention has the advantages that: the air tightness testing method provided by the invention is simple and strong in operability, and the leakage rate is calculated by measuring the pressure and the temperature.
Drawings
Fig. 1 is a structural diagram of a hydrogen gas tightness test system for a low-temperature environment.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
For the air tightness test of the hydrogen rotary joint, hydrogen is preferentially adopted as a test medium, and if the auxiliary facilities of the test field are in non-explosion-proof design, helium with the property closest to that of the hydrogen is adopted as the test medium. The gas source can adopt a hydrogen or helium gas bottle/gas bottle packaging grid, and high-pressure gas is decompressed to test pressure through a valve with a decompression function and then is introduced into a pipeline.
As the hydrogen or helium is very difficult to collect and weigh after leaking, the method of monitoring pressure on line is adopted to carry out leakage assessment, a pressure gauge or a pressure transmitter is arranged on a test pipeline, a hand valve is arranged on an upstream main pipeline of a pressure monitoring element, and an emptying bypass is arranged in front of the hand valve in order to prevent gas in an upstream pipeline from leaking to the pressure monitoring pipeline.
And introducing hydrogen or helium into the pipeline, closing the main hand valve and opening the bypass hand valve after the pressure is stable, and recording the pressure and the low-temperature bin temperature at the initial test moment and the termination test moment after the pressure is stable so as to calculate the leakage rate of the rotary joint. The leakage rate is determined according to GB 50177-2005 'design Specification for Hydrogen station' table 12.0.14 notes 6: the average hour less than 0.5% of the leakage rate is qualified, the temperature change at the initial and ending time of the test is comprehensively considered, the temperature is taken into the calculation of the leakage rate, the average hour less than 0.5% of the leakage rate is qualified, and the specific calculation method of the leakage rate is as follows:
in the formula: epsilon is leakage rate, and the unit is%; p 1 、P 2 Absolute pressure values at the initial time and the termination time are respectively expressed in kPa; t is 1 、T 2 Absolute temperature at the time of initiation and terminationIn units of K; t is the test time in min.
As shown in fig. 1, a hydrogen rotary joint gas tightness test system suitable for low temperature environment comprises a gas steel cylinder 1, a valve 2 with a pressure reduction function, a pressure gauge 5, a bypass ball valve 3, a main path ball valve 4 and a pressure test root valve 7;
the gas cylinder 1 is used for providing a gas source for gas tightness test; a valve 2 with a pressure reduction function is arranged to reduce the pressure of gas in a high-pressure steel cylinder (the general pressure is 15 MPa) to a test pressure; a bypass ball valve 3 is arranged for emptying, and a main path ball valve 4 is arranged in a main path for cutting off a gas source; a precision pressure gauge 5 and a pressure testing root valve 7 are arranged on the main path, and a pressure transmitter 6 is selectively arranged for monitoring the pressure of the gas path; the gas supply pipeline is connected to the stator end of the hydrogen rotary joint, and a pipe orifice of the stator end is plugged; except the steel cylinder, a test pipeline and a device are placed in a low-temperature test bin, after the temperature of the tested rotary joint 10 is stable, whether the motor 8 is started to drive the rotary joint 10 to rotate is determined according to test requirements (including static airtight test and dynamic airtight test), the pressure at the initial moment and the pressure at the termination moment and the temperature of the low-temperature bin are recorded, the leakage rate is calculated, the hydrogen rotary joint airtight test is judged to be qualified under the working condition when the leakage rate is lower than 0.5%, and otherwise, the hydrogen rotary joint airtight test is judged to be unqualified.
The gas steel cylinder 1 can be a hydrogen steel cylinder/steel cylinder container grid or a helium steel cylinder/steel cylinder container grid.
The valve 2 with pressure reducing function may be a pressure reducing valve, a self-operated pressure reducing valve, an adjusting valve or a hand valve with adjusting function.
And (3) plugging the pipe orifice of the rotor end, wherein a plug 9, a blind flange or a valve is adopted to plug the pipeline.
The setting of manometer 5 and pressure transmitter 6, including setting up manometer 5 or pressure transmitter 6, perhaps both set up for the record pressure value, manometer 5 or pressure transmitter 6's precision satisfies the test demand.
The temperature of the low-temperature test chamber is adjusted according to test requirements, and the simulation of the ambient temperature from normal temperature to minus 30 ℃ can be realized.
A method for testing the airtightness of a hydrogen rotary joint suitable for a low-temperature environment comprises the following steps:
the connection and fastening of the rotary union 10, the installation of the valves and the pressure test elements and the connection of the lines are first carried out according to fig. 1. Adjusting the temperature of the low-temperature test bin to a test temperature, opening the gas steel cylinder 1 after the integral temperature of the rotary joint is consistent with the ambient temperature, adjusting the pressure to a test pressure through the valve 2 with a pressure reduction function, opening the main road ball valve 4, closing the bypass ball valve 3, opening the pressure test root valve 7, loosening the plug 9 at the rotor end of the rotary joint, performing helium or hydrogen replacement on a test pipeline, closing the main road ball valve 4 after the replacement is finished, and fastening the plug 9 at the rotor end. And opening the main path ball valve 4 again, pressurizing the pipeline, and detecting all joints by adopting low-temperature leakage detection liquid to ensure that the joints have no leakage phenomenon. And closing the main path ball valve 4, closing the bottle mouth valve of the gas steel bottle 1, opening the bypass ball valve 3, evacuating gas in an upstream pipeline, and closing the bypass ball valve 3 after evacuation. The system is now in a standby state.
If the static airtight test is carried out, the pipeline pressure and the low-temperature bin environment temperature at the initial moment are recorded, and the pipeline pressure and the low-temperature bin environment temperature are recorded at the to-be-tested termination moment; if the dynamic airtight test is carried out, the motor is turned on, the rotating speed and the rotating direction are set, the pipeline pressure and the low-temperature cabin environment temperature at the initial moment are recorded, and the pipeline pressure and the low-temperature cabin environment temperature are recorded at the termination moment to be tested.
Calculating the leakage rate according to the calculation formula 1 in the invention, and if the leakage rate is less than 0.5%, judging that the gas tightness of the hydrogen rotary joint 10 is qualified at the low-temperature test temperature; if the leakage rate is greater than or equal to 0.5%, the gas tightness of the hydrogen rotary joint 10 at the low-temperature test temperature is judged to be not qualified.
This invention is not described in detail and is within the skill of those in the art.
Claims (10)
1. The gas tightness testing system for the hydrogen rotary joint suitable for the low-temperature environment is characterized by comprising a gas source, a valve (2) with a pressure reduction function, a pressure gauge (5), a bypass ball valve (3), a main path ball valve (4) and a pressure testing root valve (7);
the gas source is connected with the stator end of the tested hydrogen cyclone adapter (10) through a gas supply pipeline, a valve (2) with a pressure reducing function and a main path ball valve (4) are sequentially arranged on the gas supply pipeline, the valve (2) with the pressure reducing function is used for reducing the pressure of gas in the gas source to a test pressure, a bypass ball valve (3) is arranged on a bypass between the valve (2) with the pressure reducing function and the main path ball valve (4), and the main path ball valve (4) is used for cutting off the gas source;
a pressure gauge (5) is arranged on an air supply pipeline between the main ball valve (4) and the tested hydrogen cyclone adapter (10), and a pressure testing root valve (7) is arranged between the pressure gauge (5) and the air supply pipeline; the motor (8) is connected with the rotor end of the tested hydrogen cyclone adapter (10);
the valve (2) with the pressure reducing function, the pressure gauge (5), the bypass ball valve (3), the main path ball valve (4), the pressure testing root valve (7), the motor (8), the tested hydrogen cyclone adapter (10) and the air supply pipeline are placed in the low-temperature test bin.
2. The system of claim 1, wherein the gas source is a hydrogen cylinder, a hydrogen cylinder container, a helium cylinder, or a helium cylinder container.
3. The system for testing the airtightness of the hydrogen rotary joint applicable to the low-temperature environment according to claim 1, wherein a pipe orifice of a mover end of the hydrogen rotary joint (10) to be tested is plugged, and a pipe is plugged by using a plug, a blind flange or a valve.
4. The system for testing the airtightness of the hydrogen rotary joint applicable to the low-temperature environment according to claim 1, further comprising a pressure transmitter (6) disposed on the gas supply line between the main ball valve (4) and the hydrogen rotary joint (10) to be tested.
5. The system for testing the airtightness of the hydrogen rotary joint applicable to the low-temperature environment according to claim 1, wherein the valve (2) having the pressure reduction function is a pressure reduction valve, a self-operated pressure reduction valve, a regulating valve, or a hand valve having a regulating function.
6. A hydrogen rotary joint airtightness testing method suitable for a low-temperature environment is characterized by comprising the following steps:
installing the hydrogen rotary joint airtight testing system;
adjusting the temperature of a low-temperature test bin to a test temperature, opening an air source after the temperature of the hydrogen gas rotary joint (10) to be tested is consistent with the ambient temperature, adjusting the pressure to a test pressure through a valve (2) with a pressure reduction function, opening a main path ball valve (4), closing a bypass ball valve (3), opening a pressure test root valve (7), loosening a sealing structure of a rotor end of the hydrogen gas rotary joint (10) to be tested, performing helium or hydrogen replacement on an air supply pipeline, closing the main path ball valve (4) after the replacement is finished, and fastening a rotor end plug (9); opening a main path ball valve (4) and pressurizing an air supply pipeline; closing a main path ball valve (4), closing a gas source bottleneck valve, opening a bypass ball valve (3), evacuating gas in an upstream gas supply pipeline between a gas source and the bypass ball valve (3), and closing the bypass ball valve (3) after evacuation;
if the static airtight test is carried out, the pipeline pressure and the low-temperature bin environment temperature at the initial moment are recorded, and the pipeline pressure and the low-temperature bin environment temperature are recorded at the to-be-tested termination moment;
if the dynamic airtight test is carried out, the motor (8) is turned on, the rotating speed and the rotating direction of the motor (8) are set, the pipeline pressure and the low-temperature chamber environment temperature at the initial moment are recorded, and the pipeline pressure and the low-temperature chamber environment temperature are recorded at the termination moment to be tested;
and calculating the leakage rate according to a leakage rate calculation formula, and judging the air tightness of the tested hydrogen cyclone adapter (10) according to the leakage rate.
7. The method for testing the gas tightness of the hydrogen rotary joint applicable to the low-temperature environment according to claim 6, wherein the installing the system for testing the gas tightness of the hydrogen rotary joint comprises:
connecting an air source with a stator end of a tested hydrogen cyclone adapter (10) through an air supply pipeline, sequentially arranging a valve (2) with a pressure reducing function and a main pipeline ball valve (4) on the air supply pipeline, and arranging a bypass ball valve (3) on a bypass between the valve (2) with the pressure reducing function and the main pipeline ball valve (4); a pressure gauge (5) is arranged on an air supply pipeline between the main pipeline ball valve (4) and the tested hydrogen cyclone adapter (10), and a pressure testing root valve (7) is arranged between the pressure gauge (5) and the air supply pipeline; connecting a motor (8) with a rotor end of a tested hydrogen cyclone adapter (10);
placing a valve (2) with a pressure reducing function, a pressure gauge (5), a bypass ball valve (3), a main path ball valve (4), a pressure testing root valve (7), a motor (8), a tested hydrogen cyclone adapter (10) and an air supply pipeline in a low-temperature test bin;
the temperature of the low-temperature test chamber is adjusted according to test requirements, and the simulation of the ambient temperature from normal temperature to minus 30 ℃ can be realized.
8. The method for testing the gas tightness of the hydrogen swivel joint applicable to the low-temperature environment as claimed in claim 6, wherein the main ball valve (4) is opened, and after the gas supply pipeline is pressurized, the leakage detection liquid is used to detect all joints on the gas supply pipeline, so as to ensure that all joints have no leakage phenomenon.
9. The method for testing the gas tightness of the hydrogen rotary joint applicable to the low-temperature environment according to claim 6, wherein the leakage rate is calculated according to the following formula:
wherein: e is leakage rate; p 1 、P 2 Absolute pressure values at an initial time and a termination time respectively; t is 1 、T 2 Absolute temperatures at the initial time and the end time, respectively; and t is the test time.
10. The method for testing the airtightness of the hydrogen rotary joint applicable to the low-temperature environment according to claim 6, wherein the judging the airtightness of the tested hydrogen rotary joint (10) according to the leakage rate includes:
if the leakage rate is less than 0.5%, judging that the tested hydrogen cyclone adapter (10) is airtight and qualified at the set test temperature; and if the leakage rate is greater than or equal to 0.5%, judging that the tested hydrogen rotary adapter (10) is unqualified in air tightness at the set test temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117890033A (en) * | 2024-03-15 | 2024-04-16 | 连云港跻强机械制造有限公司 | Low-temperature rotary joint airtight test equipment for LNG loading arm |
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2022
- 2022-08-08 CN CN202210946224.6A patent/CN115493774A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117890033A (en) * | 2024-03-15 | 2024-04-16 | 连云港跻强机械制造有限公司 | Low-temperature rotary joint airtight test equipment for LNG loading arm |
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