CN107238450A - A kind of cryogenic fluid transfer pipeline leakage heat test device and method - Google Patents
A kind of cryogenic fluid transfer pipeline leakage heat test device and method Download PDFInfo
- Publication number
- CN107238450A CN107238450A CN201710411711.1A CN201710411711A CN107238450A CN 107238450 A CN107238450 A CN 107238450A CN 201710411711 A CN201710411711 A CN 201710411711A CN 107238450 A CN107238450 A CN 107238450A
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- cryogenic
- fluid
- temperature
- transfer lines
- pressure
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- 238000012546 transfer Methods 0.000 title claims abstract description 72
- 239000012530 fluid Substances 0.000 title claims abstract description 61
- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005057 refrigeration Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 239000001307 helium Substances 0.000 claims description 32
- 229910052734 helium Inorganic materials 0.000 claims description 32
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 32
- 238000005259 measurement Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 238000002637 fluid replacement therapy Methods 0.000 claims description 2
- 230000006872 improvement Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- 230000002631 hypothermal effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010020852 Hypertonia Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
- G01K17/06—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device
- G01K17/08—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device based upon measurement of temperature difference or of a temperature
- G01K17/10—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device based upon measurement of temperature difference or of a temperature between an inlet and an outlet point, combined with measurement of rate of flow of the medium if such, by integration during a certain time-interval
- G01K17/12—Indicating product of flow and temperature difference directly or temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Heat test device is leaked the invention discloses a kind of cryogenic fluid transfer pipeline, the fluid of described device including test, control system, refrigeration machine, primary heater, cryogenic transfer lines, secondary heater, mass flowmenter, surge tank and the circulating pump for circulating along fluid transmission direction connection successively.The invention also discloses the method for testing based on the device.The apparatus and method can efficiently utilize test cryogen, and the leaking heat of low temperature transmission pipeline is tested exactly, while being tested suitable for different cryogenic transfer lines, test all-purpose is good.
Description
Technical field
The invention belongs to cryogenic fluid transfer field, and in particular to a kind of cryogenic fluid transfer pipeline leakage heat test device and
Method.
Background technology
Cryogenic fluid transfer pipeline is widely used in cryogenic fluid transfer field.It is right with reference to the application environment of cryogen
The insulation requirements of its transfer line are extremely strict.The accurate measurement of leaking heat is carried out to cryogen pipeline turns into cryogen pipe
The problem of line is designed with considering required for engineer applied.
Under conventional situation, the filling corresponding cryogen in cryogenic fluid transfer pipeline treats that cryogen stands one section
After time recovers stable, by measuring amount of vaporization of the cryogen within certain a period of time, further according to the vaporization of the cryogen
Calorific value extrapolates cryogenic fluid transfer pipeline leakage calorific value.This method can not ensure the accurate measurement of leakage heat, and reason mainly has at 2 points：
First, state of the cryogen in cryogenic fluid transfer pipeline is different, cryogen is static when test, and real
Cryogen is motion during the use of border, and this just determines that the accuracy of Lou Thermal test needs to be investigated；Second, cryogen is passed
It is small that defeated pipeline volume is usually quite, the exception of any one external condition, can all influence to leak the result of Thermal test, test is accurate
True property is poor.
The content of the invention
The present invention makes improvements for existing technical problem, i.e., the technical problems to be solved by the invention are to provide a kind of low
Warm fluid transfer pipe line leakage heat test device and its method of testing, the leaking heat of low temperature transmission pipeline can be tested exactly.
To achieve the above objectives, the technical solution adopted by the present invention includes a kind of cryogenic fluid transfer pipeline leakage Thermal test dress
Put and method, it is specific as follows：
A kind of cryogenic fluid transfer pipeline leaks heat test device, including test is passed with fluid, control system and along fluid
The refrigeration machine of connection, primary heater, cryogenic transfer lines, secondary heater, mass flowmenter, buffering are circulated successively in defeated direction
Tank and circulating pump；First pressure harvester that the control system is set to the cryogenic transfer lines rear end, the first temperature
The second temperature harvester that harvester and the cryogenic transfer lines front end are set carries out signal acquisition, and adds to first
Hot device, secondary heater carry out heating and temperature control.
The improvement of heat test device is leaked as above-mentioned cryogenic fluid transfer pipeline, the fluid is helium.
The further improvement of heat test device is leaked as above-mentioned cryogenic fluid transfer pipeline, the surge tank is also respectively connected with
Emptying valve, the helium steel cylinder which is provided with cylinder valve, the control system carries out signal acquisition to the pressure of surge tank, right
The cylinder valve and the emptying valve are controlled.
A kind of cryogenic fluid transfer pipeline leaks the method for testing of heat test device, it is characterised in that comprise the following steps：
Step one, cryogenic refrigeration is carried out with fluid to test；
Step 2, is heated to the cryogen after refrigeration, its temperature is reached cryogenic transfer lines test target temperature
Angle value；
Step 3, cryogen flows through cryogenic transfer lines, and measurement in real time flows through the low temperature stream at cryogenic transfer lines two ends
Cryogenic fluid pressure near the temperature difference and cryogenic transfer lines of body；
Step 4, is heated to carrying out after flow rate test after normal temperature, followed by buffer-stored to cryogen；
Step 5, extracts the fluid of buffer-stored, is recycled for step one；
The leaking heat of cryogenic transfer lines is calculated by Thermodynamics Formulas Q=cm △ t, wherein：Q is leakage calorific value, and △ t are low temperature
The temperature difference is imported and exported at transfer line two ends, and m is fluid specific heat capacity for the liquid mass flow m, c of certain period of time, and c is by measured
Fluid pressure is calculated and drawn.
The improvement of the method for testing of heat test device is leaked as above-mentioned cryogenic fluid transfer pipeline, this method is also included to slow
The fluid of punching storage carries out pressure monitor, and such as pressure carries out emptying decompression to fluid higher than setting high level, and such as pressure is less than setting
Low value fluid replacement.
The principle and technique effect of above-mentioned cryogenic fluid transfer pipeline leakage heat test device and method are as follows：
1) constant flow of the cryogen in cryogenic transfer lines is realized；Primary heater control flows into low temperature transmission
The temperature of the cryogen of pipeline, secondary heater and mass flowmenter are combined the fluid of measurement outflow cryogenic transfer lines
Flow, with reference to related pressure and temperature sensing device, cryogenic fluid transfer pipeline can be accurately calculated by Thermodynamics Formulas
Leak calorific value.
2) after said apparatus is by the closed cycle structure of itself, the i.e. fluid cushion of test, enter again through circulating pump
Enter refrigeration, realize recycling for fluid, reduce the waste of resource.
3) use helium to test various cryogenic transfer lines as cryogen and leak thermal measurement.Because helium has stagnation temperature
The characteristics of spending low, extremely stable and it is difficult to liquefaction and solidification.As cryogen carrying out Lou Thermal test with helium, there is provided more
Wide in range temperature range, meets the test needs of Different hypothermia transfer line target temperature, with the good technology of test all-purpose
Effect.
Brief description of the drawings
Fig. 1 schemes for the cryogenic fluid transfer pipeline leakage heat test device composition of the present invention.
Embodiment
Describe to be used to disclose the present invention below so that those skilled in the art can realize the present invention.It is excellent in describing below
Embodiment is selected to be only used as citing, it may occur to persons skilled in the art that other obvious modifications.
For sake of convenience and for purpose of brevity, the preceding direction for flow of fluid formed by the application is consistent, is afterwards flow of fluid
Inverse direction.
Cryogenic fluid transfer pipeline leakage heat test device in the present embodiment includes refrigeration machine 10, primary heater 21, the
Two heaters 22, tested cryogenic transfer lines 30, mass flowmenter 40, surge tank 50, circulating pump 60, control system 70.
Along fluid transmission direction, refrigeration machine 10, primary heater 21, secondary heater 22, tested cryogenic transfer lines 30, quality
Flowmeter 40, surge tank 50, circulating pump 60 are in turn connected to form loop structure.
Refrigeration machine 10 will flow into helium and be cooled in circulating pump 60.In Project Realization, the low temperature helium that refrigeration machine 10 is exported
Target temperature requirement of the temperature degree less than cryogenic transfer lines 30.Low-temperature helium heated through primary heater 21 after from low temperature
Flowed out in transfer line 30.Because the helium temperature that cryogenic transfer lines 30 flow out is relatively low, mass flowmenter is difficult to meet direct
The requirement of flow measurement is carried out to low-temperature helium.Therefore need to enter secondary heater 22 in the helium that cryogenic transfer lines 30 flow out and heat
The measurement of flow is carried out after to normal temperature by flow meter 40.Helium after flow measurement flows into surge tank 50 and supplies circulating pump
60 recycle.
The measurement of the leaking heat of cryogenic transfer lines 30 is to calculate leakage calorific value Q to realize by Thermodynamics Formulas Q=cm △ t
's.Implementation process needs measurement cryogen by cryogenic fluid transfer pipeline import and export temperature difference △ t, and the period matter
Flow m is measured, and cryogen is the specific heat capacity C of helium.Helium specific heat capacity C can be obtained by measuring its calculation of pressure, be belonged to
General knowledge known in this field.In the present embodiment, helium is carried out provided with the first helium pressure harvester in the rear end of primary heater 21
Pressure measxurement.The porch of cryogenic transfer lines 30 is provided with inlet temperature harvester, and exit is provided with outlet temperature harvester.
Pressure change can be produced by flowing through cryogenic transfer lines 30 in view of cryogen, for more accurate progress helium specific heat capacity
Calculate.Improved as one kind of the present embodiment, being additionally provided with second pressure harvester in cryogenic transfer lines 30 carries out pressure survey
Amount.Helium specific heat capacity C by above-mentioned two pressure acquisitions value mean value calculation.Associated gas pressure measxurement, temperature survey it is specific
Embodiment, to those skilled in the art, without being that can be achieved by creative work, I will not elaborate.
Control system 70 is acquired, to mass flow to the gas pressure and temperature information at the two ends of cryogenic transfer lines 30
The flow of meter 40 carries out signal acquisition.Meanwhile, temperature control is carried out to primary heater 21 and secondary heater 22.First heating
The controlling value of the outlet helium temperature of device 21 is the test target temperature of cryogenic transfer lines 30.The helium of secondary heater 22 goes out
In the operating temperature range that mouthful temperature should control that accurately helium gas flow can be measured in mass flowmenter 40, such as normal temperature.
Due in surge tank 50 helium pressure may not just meet experiment condition from.In the present embodiment, surge tank 50 also connects
It is connected to helium steel cylinder 80.When hypotony in surge tank 50, the steel cylinder being connected between surge tank 50 and helium steel cylinder 80 is opened
Valve, tonifying Qi is carried out to surge tank 50.When hypertonia in surge tank 50, the emptying valve progress that surge tank 50 is connected is opened
Deflate.Control system 70 carries out signal acquisition to the pressure of surge tank 50, and the above-mentioned two valve for connecting surge tank 50 is carried out
Switch control.
In the present embodiment, various cryogenic fluid transfer pipeline leakage thermal measurements are tested using helium as cryogen.This is
Due to, compared to other fluids, the characteristics of helium critical-temperature is low, extremely stable and it is difficult to liquefaction and solidification.Such as, oxygen exists
Under standard state, light blue liquid is changed into when temperature is -183 DEG C；Nitrogen at normal atmospheric pressure, is cooled to -195.8 DEG C
When, become do not have coloured liquid；And the critical-temperature of helium is -268 DEG C.Because helium critical-temperature is surveyed away from cryogenic piping
The target temperature of examination, cryogen is difficult to the phenomenon that there is gas-liquid two-phase, and test accuracy is high.Entered with helium as cryogen
Row leakage Thermal test, also provides more wide in range temperature range, meets the target temperature test needs of Different hypothermia transmission pipeline.
It need to such as be tested, low temperature transmission pipeline need to be only changed for Different hypothermia transmission pipeline.
In the present embodiment, helium is recycled due to the circulating pump 60 by connecting surge tank 50, it is to avoid from
The waste that cryogenic transfer lines 30 are directly emptied after flowing out.
Method of testing based on the cryogenic fluid transfer pipeline leakage heat test device described in above-described embodiment is as follows：
Cryogen refrigerant 10 freezes, the heated target temperature reached required for cryogenic transfer lines 30, low temperature stream
Body, which is flowed through, carries out flow measurement after cryogenic transfer lines 30, surge tank is flowed into thereafter, and circulating pump follows the cryogen of surge tank
Ring such as refrigeration machine.Cryogenic fluid pressure, temperature and the fluid flow at measurement cryogenic transfer lines end, public according to thermodynamics in real time
Formula Q=cm △ t, calculate the leaking heat of cryogenic transfer lines.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and that described in above-described embodiment and specification is the present invention
Principle, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these change and
Improvement is both fallen within the range of claimed invention.The protection domain of application claims by appended claims and its
Equivalent is defined.
Claims (6)
1. a kind of cryogenic fluid transfer pipeline leaks heat test device, it is characterised in that including test fluid, control system and
The refrigeration machine of connection, primary heater, cryogenic transfer lines, secondary heater, quality stream are circulated successively along fluid transmission direction
Gauge, surge tank and circulating pump；First pressure harvester that the control system is set to the cryogenic transfer lines rear end,
The second temperature harvester that first temperature collecting device and the cryogenic transfer lines front end are set carries out signal acquisition, and
Heating and temperature control is carried out to primary heater, secondary heater.
2. a kind of cryogenic fluid transfer pipeline leakage heat test device according to claim 1, it is characterised in that the fluid
For helium.
3. a kind of cryogenic fluid transfer pipeline leakage heat test device according to claim 1 or 2, it is characterised in that described
Surge tank is also respectively connected with emptying valve, which is provided with the helium steel cylinder of cylinder valve, pressure of the control system to surge tank
Power carries out signal acquisition, and the cylinder valve and the emptying valve are controlled.
4. a kind of cryogenic fluid transfer pipeline leakage heat test device according to claim 1 or 2, it is characterised in that described
Cryogenic transfer lines front end is provided with second pressure harvester, and the control system carries out signal to the second pressure harvester
Collection.
5. the cryogenic fluid transfer pipeline described in a kind of claim 1 leaks the method for testing of heat test device, it is characterised in that bag
Include following steps：
Step one, cryogenic refrigeration is carried out with fluid to test；
Step 2, is heated to the cryogen after refrigeration, its temperature is reached cryogenic transfer lines test target temperature value；
Step 3, cryogen flows through cryogenic transfer lines, and measurement in real time flows through the cryogen at cryogenic transfer lines two ends
Cryogenic fluid pressure near temperature difference and cryogenic transfer lines；
Step 4, is heated to carrying out after flow rate test after normal temperature, followed by buffer-stored to cryogen；
Step 5, extracts the fluid of buffer-stored, is recycled for step one；
The leaking heat of cryogenic transfer lines is calculated by Thermodynamics Formulas Q=cm △ t, wherein：Q is leakage calorific value, and △ t transmit for low temperature
The temperature difference is imported and exported at pipeline two ends, and m is fluid specific heat capacity for the liquid mass flow m, c of certain period of time, and c is by measured fluid
Calculation of pressure is drawn.
6. cryogenic fluid transfer pipeline according to claim 5 leaks the method for testing of heat test device, it is characterised in that should
Method also includes carrying out the fluid of buffer-stored pressure monitor, and such as pressure carries out emptying decompression higher than setting high level to fluid,
If pressure is less than setting low value fluid replacement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710411711.1A CN107238450A (en) | 2017-06-05 | 2017-06-05 | A kind of cryogenic fluid transfer pipeline leakage heat test device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710411711.1A CN107238450A (en) | 2017-06-05 | 2017-06-05 | A kind of cryogenic fluid transfer pipeline leakage heat test device and method |
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| Publication Number | Publication Date |
|---|---|
| CN107238450A true CN107238450A (en) | 2017-10-10 |
Family
ID=59985819
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710411711.1A Pending CN107238450A (en) | 2017-06-05 | 2017-06-05 | A kind of cryogenic fluid transfer pipeline leakage heat test device and method |
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| CN (1) | CN107238450A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107907321A (en) * | 2017-12-15 | 2018-04-13 | 江苏克劳特低温技术有限公司 | One kind leakage heat test device and its application method |
| CN110017919A (en) * | 2018-01-10 | 2019-07-16 | 中国科学院理化技术研究所 | Cryogenic delivery pipe road leaking heat test macro and measurement method |
| CN110095206A (en) * | 2019-05-21 | 2019-08-06 | 浙江大学 | A kind of the temperature of rotor measurement simulation system and method for low-temperature centrifugation formula fluid machinery |
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| CN107907321A (en) * | 2017-12-15 | 2018-04-13 | 江苏克劳特低温技术有限公司 | One kind leakage heat test device and its application method |
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| CN110017919A (en) * | 2018-01-10 | 2019-07-16 | 中国科学院理化技术研究所 | Cryogenic delivery pipe road leaking heat test macro and measurement method |
| CN110095206A (en) * | 2019-05-21 | 2019-08-06 | 浙江大学 | A kind of the temperature of rotor measurement simulation system and method for low-temperature centrifugation formula fluid machinery |
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