CN114441166B - Ultralow temperature and micro-positive pressure coupling generating device - Google Patents
Ultralow temperature and micro-positive pressure coupling generating device Download PDFInfo
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- CN114441166B CN114441166B CN202111568710.0A CN202111568710A CN114441166B CN 114441166 B CN114441166 B CN 114441166B CN 202111568710 A CN202111568710 A CN 202111568710A CN 114441166 B CN114441166 B CN 114441166B
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- 230000008878 coupling Effects 0.000 title claims abstract description 52
- 238000010168 coupling process Methods 0.000 title claims abstract description 52
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 52
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 28
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- 238000004321 preservation Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 2
- 238000011056 performance test Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012354 overpressurization Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention belongs to the technical field of performance test of LNG tank top calling valves, and particularly relates to an ultralow temperature and micro-positive pressure coupling generating device capable of simulating a temperature and pressure coupling environment in which ultralow temperature and micro-positive pressure exist simultaneously. The device comprises an ultralow temperature input unit, a positive pressure input unit, a temperature and pressure coupling unit, an adjusting unit and a test unit, wherein each unit is connected with a measurement and control module. The device can simulate the temperature and pressure coupling environment in which the ultra-low temperature and the micro-positive pressure exist simultaneously, thereby providing preconditions for performance test of the LNG tank top calling valve under the ultra-low temperature and micro-positive pressure coupling environment.
Description
Technical Field
The invention belongs to the technical field of performance test of LNG tank top calling valves, and particularly relates to an ultralow temperature and micro-positive pressure coupling generating device capable of simulating a temperature and pressure coupling environment in which ultralow temperature and micro-positive pressure exist simultaneously.
Background
With the development of the LNG industry, the construction scale and the number of LNG receiving stations are increasing, and the number of large LNG storage tanks is also increasing drastically. In operation, an LNG storage tank is filled with LNG medium, and in the filling process, the medium pressure in the pipe is gradually increased along with the increase of the medium; meanwhile, when the medium in the tank body increases along with the storage time, the LNG medium is gasified, so that the pressure in the tank body is abnormally increased. LNG storage tank tops are typically equipped with tank top calling valves to balance the tank pressure to prevent tank over-pressurization. At present, an LNG tank top calling valve basically depends on foreign import, is high in price, long in supply period and slow in after-sales service response, and more importantly, no related LNG tank top calling valve test device is used for testing and detecting products in China, so that quality performance of the products cannot be accurately estimated.
An important check index of the LNG tank top calling valve is to detect the setting pressure, the seat returning pressure, the action performance and the sealing performance of the LNG tank top calling valve under the condition that the ultralow temperature medium temperature environment and the micro-positive pressure environment are simultaneously met. The test process not only needs to provide an ultralow temperature environment of minus 110 ℃ to minus 180 ℃, but also needs to provide a micro-positive pressure environment of 0.75KPa to 3 KPa. The coupling of a single ultralow temperature environment, an ultralow temperature environment and a high pressure environment and the coupling of a single micro positive pressure environment, a normal temperature and a micro positive pressure environment are easy to realize, but the simulation of the ultralow temperature and micro positive pressure coupling environment is difficult to realize; the main reason is that the ultra-low temperature medium has very low temperature and very large temperature difference with the environment temperature, so that the pressure is easy to rise to exceed the pressure category of micro-positive pressure due to heat leakage, the performance test of the LNG tank top calling valve is very difficult to be carried out under the ultra-low temperature and micro-positive pressure coupling environment, and the problem needs to be solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an ultralow temperature and micro-positive pressure coupling generating device which can simulate the temperature and pressure coupling environment existing at the same time under the ultralow temperature and micro-positive pressure, thereby providing preconditions for performance test of an LNG tank top calling valve under the ultralow temperature and micro-positive pressure coupling environment.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an ultralow temperature and micro positive pressure coupling generating device is characterized in that: the device comprises an ultralow temperature input unit, a positive pressure input unit, a temperature and pressure coupling unit, an adjusting unit and a test unit, wherein each unit is connected with a measurement and control module; wherein:
ultra-low temperature input unit: the device comprises a vapor-liquid buffer tank, wherein an input port of the vapor-liquid buffer tank is sequentially communicated with a liquid phase outlet of a liquid nitrogen tank through a stop valve V1 and a stop valve V2, and an output port of the vapor-liquid buffer tank is communicated with a positive pressure input unit through a stop valve V3; the ultralow temperature input unit further comprises a heat preservation pipeline, the input end of the heat preservation pipeline is communicated to a section of pipeline between the stop valve V1 and the stop valve V2, and the output end of the heat preservation pipeline is communicated to a cold screen thermostat of the test unit through the stop valve V10;
positive pressure input unit: comprising a regulating valve CV1 and a shut-off valve V4 connected in parallel with each other;
temperature and pressure coupling unit: the device comprises a temperature-pressure coupling tank, wherein an input pipeline of the temperature-pressure coupling tank is communicated with the positive pressure input unit through a stop valve V5, one output pipeline of the temperature-pressure coupling tank is communicated with the regulating unit through a stop valve V6, and the other output pipeline of the voltage-stabilizing coupler is communicated with the test unit through a stop valve V7;
an adjusting unit: comprising a regulating valve CV2 and a shut-off valve V8 connected in parallel with each other;
test unit: the system comprises a first parallel pipeline, a cold screen attemperator and an LNG tank top calling valve, wherein the first parallel pipeline is communicated with a temperature-pressure coupling tank and consists of a regulating valve CV3 and a stop valve V9 which are connected in parallel;
an alcohol bubble counter communicated with the LNG tank top calling valve is arranged beside the LNG tank top calling valve, and a liquid level sensor L is arranged at the gas-liquid cache tank; and the pressure sensor and the temperature sensor are respectively arranged at the top calling valve of the vapor-liquid buffer tank, the temperature-pressure coupling tank and the LNG tank.
Preferably, safety valves are respectively arranged at the ultralow temperature input unit, the positive pressure input unit and the temperature and pressure coupling unit.
Preferably, the measurement and control module comprises an upper computer for sending out instructions and a PLC for executing the instructions.
The invention has the beneficial effects that:
1) Through the scheme, the balance of ultralow temperature and micro positive pressure can be realized, and the temperature and pressure coupling environment existing at the same time of the ultralow temperature and the micro positive pressure can be reliably and rapidly simulated, so that a basic environment is provided for the performance test of the LNG tank top calling valve.
Drawings
FIG. 1 is a schematic block diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the piping connection of the present invention.
The actual correspondence between each label and the component name of the invention is as follows:
10-ultralow temperature input unit 11-vapor-liquid buffer tank 11 a-liquid nitrogen heater
20-positive pressure input unit 30-temperature-pressure coupling unit 31-temperature-pressure coupling tank
40-adjusting unit 50-test unit
51-LNG tank top calling valve 52-alcohol bubble counter 53-cold screen thermostat
60-measurement and control module
Detailed Description
For ease of understanding, the specific structure and operation of the present invention will be further described herein with reference to FIGS. 1-2:
the specific structure of the invention is shown in fig. 1-2, and mainly comprises an ultralow temperature input unit 10, a positive pressure input unit 20, a temperature and pressure coupling tank 31 unit, a test unit 50, an adjusting unit 40 and a measurement and control module 60. Wherein:
the ultra-low temperature input unit 10 consists of a liquid nitrogen liquid inlet pipeline, a vapor-liquid buffer tank 11 with a liquid nitrogen heater 11a, a liquid nitrogen liquid outlet pipeline, a safety valve and the like. A stop valve V1 and a stop valve V2 are arranged on the liquid nitrogen liquid inlet pipeline; a temperature sensor T1, a pressure sensor T2 and a liquid level sensor L are arranged at the vapor-liquid buffer tank 11. The ultra-low temperature input unit 10 further comprises a heat-insulating pipeline, one end of the heat-insulating pipeline is communicated with a section of liquid nitrogen liquid inlet pipeline between the stop valve V1 and the stop valve V2, and the other end of the heat-insulating pipeline is communicated with the test unit 50 through the stop valve V10.
The positive pressure input unit 20 includes a positive pressure input pipe with a shut-off valve V4 and a positive pressure input adjustment pipe with an adjustment valve CV1 arranged in parallel with each other. The positive pressure input unit 20 is also provided with a safety valve.
The temperature-pressure coupling unit 30 is composed of a temperature-pressure coupling tank 31, a temperature sensor T2, a pressure sensor P2, a safety valve, a stop valve V5, a stop valve V6, a stop valve V7 and the like at the interfaces of all paths. A discharge valve is arranged at the bottom of the temperature and pressure coupling tank 31.
The test unit 50 consists of an output pipeline with a stop valve V9, an output adjusting pipeline with an adjusting valve CV3, a cold screen temperature regulator 53 with a cold source communicated with the heat preservation pipeline, an LNG tank top calling valve 51, an alcohol bubble counter 52 and the like. A temperature sensor T3 and a pressure sensor P3 are also arranged at the LNG tank top call valve 51. The LNG tank top call valve 51 and the cold screen attemperator 53 are connected to each other by a connection pad.
The regulating unit 40 comprises a regulating manifold with a regulating valve CV2 and a trim bypass with a shut-off valve V8.
The measurement and control module 60 is composed of a PLC, an upper computer and the like.
To facilitate the understanding of the above-described connection structure of the present invention, a specific test method of the present invention is given here as follows:
the invention aims to realize temperature-pressure coupling of ultralow temperature and micro positive pressure, and the method comprises three steps of a first-order precooling process, a second-order precooling process and a pressure-stabilizing cold-preserving process:
s1, a first-order precooling process:
s11, opening a stop valve V6 and a stop valve V8, and operating a regulating valve CV2 to the maximum opening;
s12, opening a stop valve V5, stopping a valve V4, and operating a regulating valve CV1 to the maximum opening;
s13, opening a stop valve V1 and a stop valve V3;
s14, opening a stop valve V2, and starting to input liquid nitrogen into the vapor-liquid cache tank 11;
s15, observing indication values of a temperature sensor T1, a pressure sensor P1 and a liquid level sensor T1 at the position of the vapor-liquid cache tank 11 to keep a set value, and then entering a step S2;
the main purpose of this process is to cool down and pre-cool down the temperature-pressure coupling tank 31, because the LNG tank top calling valve 51 belongs to micro-positive pressure action, and the pressure generated by liquid nitrogen entering the normal temperature pipeline and container and being heated and rapidly vaporized is far higher than the action pressure of the LNG tank top calling valve 51, it is necessary to cool down and pre-cool down the temperature-pressure coupling tank 31 independently.
S2, a second-order precooling process:
s21, opening a stop valve V10, and observing an indication value of a temperature sensor T2 at the temperature-pressure coupling tank 31 until the indication value reaches-100 ℃;
s22, opening a stop valve V7, gradually increasing the opening of a regulating valve CV3, observing the indication value of a pressure sensor P2 at the temperature and pressure coupling tank 31, and operating the opening of the regulating valve CV3 to enable the indication value of the pressure sensor P2 to be always lower than the action pressure of the LNG tank top calling valve 51;
s23, observing the indication values of the temperature sensor T3 and the temperature sensor T2 until the indication values are equal and the temperature required by the test is reached; s2, entering a step S;
the main purpose of the process is to pre-cool and adjust the temperature of the air inlet pipe orifice of the LNG tank top calling valve 51 through a cold screen temperature regulator, and then input micro-positive pressure cold nitrogen pre-cool to the air inlet pipe and the discharge pipe of the LNG tank top calling valve 51 through a temperature-pressure coupling tank 31. The cold screen temperature regulator 53 circulates liquid nitrogen internally to perform radiation precooling on the air inlet pipe orifice of the LNG tank top calling valve 51, and the warm-pressure coupling tank 31 outputs cold nitrogen to perform convection precooling on the air inlet pipe orifice of the LNG tank top calling valve 51.
S3, stabilizing and preserving cold:
when the temperature and the pressure meet the requirements of the ultra-low temperature and the micro-positive pressure required by the test, an ultra-low temperature and micro-positive pressure coupling environment can be formed at the moment, and the temperature and the pressure are stabilized;
s31, along with the test and system heat leakage, the temperature change is regulated by controlling the opening and closing of the stop valve V1 and the stop valve V10 by the measurement and control module 60;
s32, along with the test, the change of pressure is regulated by controlling the opening degree of the regulating valves CV1 and CV2 and the power of the liquid nitrogen heater 11a at the vapor-liquid buffer tank 11 through the measurement and control module 60.
In actual operation, the pressure stabilizing and cold preserving process can consider a PID (proportion integration differentiation) regulating algorithm program with multivariable input conditions to control the ultralow temperature parameter and the micro-positive pressure parameter required by the stability test, the specific control mode is completed through an upper computer, and the PLC is responsible for executing the upper computer command and driving each unit to execute corresponding actions so as to form the ultralow temperature and micro-positive pressure coupling environment required by the test more flexibly and controllably.
It will be understood by those skilled in the art that the present invention is not limited to the details of the foregoing exemplary embodiments, but includes other specific forms of the same or similar structures that may be embodied without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Techniques of the present invention, which are not described in detail, are well known.
Claims (3)
1. An ultralow temperature and micro positive pressure coupling generating device is characterized in that: the device comprises an ultralow temperature input unit (10), a positive pressure input unit (20), a temperature and pressure coupling unit (30), an adjusting unit (40) and a test unit (50), wherein each unit is connected with a measurement and control module (60); wherein:
an ultra-low temperature input unit (10): the device comprises a vapor-liquid caching tank (11), wherein an input port of the vapor-liquid caching tank (11) is communicated to a liquid phase outlet of a liquid nitrogen tank through a stop valve V1 and a stop valve V2 in sequence, and an output port of the vapor-liquid caching tank (11) is communicated with a positive pressure input unit (20) through a stop valve V3; the ultralow temperature input unit (10) further comprises a heat preservation pipeline, the input end of the heat preservation pipeline is communicated to a section of pipeline between the stop valve V1 and the stop valve V2, and the output end of the heat preservation pipeline is communicated to a cold screen temperature regulator (53) of the test unit (50) through the stop valve V10;
positive pressure input unit (20): comprising a regulating valve CV1 and a shut-off valve V4 connected in parallel with each other;
temperature and pressure coupling unit (30): the device comprises a warm-pressure coupling tank (31), wherein an input pipeline of the warm-pressure coupling tank (31) is communicated with the positive pressure input unit (20) through a stop valve V5, one output pipeline of the warm-pressure coupling tank (31) is communicated with the regulating unit (40) through a stop valve V6, and the other output pipeline of the steady-pressure coupler is communicated with the test unit (50) through a stop valve V7;
an adjustment unit (40): comprising a regulating valve CV2 and a shut-off valve V8 connected in parallel with each other;
test unit (50): the system comprises a first parallel pipeline which is communicated with a temperature-pressure coupling tank (31) and consists of a regulating valve CV3 and a stop valve V9 which are connected in parallel, wherein the first parallel pipeline is communicated with an LNG tank top calling valve (51) through a cold screen temperature regulator (53), and the stop valve V9 has the function of providing a large flow channel and ensuring the smooth action of the LNG tank top calling valve;
an alcohol bubble counter (52) communicated with the LNG tank top calling valve (51) is arranged beside the LNG tank top calling valve (51), and a liquid level sensor L is arranged at the position of the vapor-liquid buffer tank (11); the gas-liquid buffer tank (11), the temperature-pressure coupling tank (31) and the LNG tank top calling valve (51) are respectively provided with a pressure sensor and a temperature sensor.
2. The ultra-low temperature and micro-positive pressure coupling generating device according to claim 1, wherein: safety valves are respectively arranged at the ultralow temperature input unit (10), the positive pressure input unit (20) and the temperature and pressure coupling unit (30).
3. The ultra-low temperature and micro-positive pressure coupling generating device according to claim 1, wherein: the measurement and control module (60) comprises an upper computer which sends out instructions and a PLC which executes the instructions.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111568710.0A CN114441166B (en) | 2021-12-21 | 2021-12-21 | Ultralow temperature and micro-positive pressure coupling generating device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111568710.0A CN114441166B (en) | 2021-12-21 | 2021-12-21 | Ultralow temperature and micro-positive pressure coupling generating device |
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| Publication Number | Publication Date |
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| CN114441166A CN114441166A (en) | 2022-05-06 |
| CN114441166B true CN114441166B (en) | 2024-02-20 |
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2021
- 2021-12-21 CN CN202111568710.0A patent/CN114441166B/en active Active
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