CN103697956A - System for measuring evaporation rate of cryogenic vessel with stable back pressure - Google Patents
System for measuring evaporation rate of cryogenic vessel with stable back pressure Download PDFInfo
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- CN103697956A CN103697956A CN201310659152.8A CN201310659152A CN103697956A CN 103697956 A CN103697956 A CN 103697956A CN 201310659152 A CN201310659152 A CN 201310659152A CN 103697956 A CN103697956 A CN 103697956A
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Abstract
The invention discloses a system for measuring evaporation rate of a cryogenic vessel with stable back pressure. The system comprises a gas emission pipeline. An emptying valve and a gas mass flow meter are arranged on the gas emission pipeline. The outlet of the gas mass flow meter is provided with a buffer tank; the buffer tank is connected with a discharge pipe. The system also comprises a back pressure control system. The back pressure control system comprises a pressure sensor, a programmable controller, a computer, a pressure controller, a rapid exhaust line and a rapid gas supply system. The pressure controller is used for controlling pressure in the buffer tank; the input end of the pressure controller is connected with the computer and the programmable controller; the pressure controller is also connected with three gas control connectors of the rapid exhaust line, the rapid gas supply system and the buffer tank; the input end of the programmable controller is connected with the gas mass flow meter and the pressure sensor. The system can be used for effectively reducing influences of environment pressure changes on the evaporation rate of the cryogenic vessel, and has the characteristics that the structure is simple, and the measuring accuracy is high.
Description
Technical field
The present invention relates to cryogenic engineering, especially relate to a kind of low-temperature (low temperature) vessel rate of evaporation system.
Background technology
The rate of evaporation of low-temperature (low temperature) vessel is the most important technical parameter of evaluating its heat-insulating property, can reflect intuitively the cold insulation performance of low-temperature (low temperature) vessel.At present, in deep freeze refrigeration plant field, all adopt the simple experiment device being in series by atmospheric valve, heat interchanger and mass-flow gas meter to measure the flash evaporation amount of low-temperature (low temperature) vessel, in low-temperature (low temperature) vessel, liquid-gas interface reaches after balance, and the flash evaporation amount gathering at least 24 hours is continuously obtained to rate of evaporation through converting.As just recommended this static evaporation rate measuring method in GB/T18443.5-2010 vacuum insulation deep freeze refrigeration plant method for testing performance.But, there is correlative study to show, environmental pressure has a certain impact to low-temperature (low temperature) vessel evaporation flow, affects measuring accuracy.In actual measurement, because the back pressure of mass-flow gas meter is environmental pressure, the variation of its pressure will directly affect the flash evaporation amount of liquid in low-temperature (low temperature) vessel, this test unit cannot control effectively to the variation of the back pressure of mass-flow gas meter, cause the flash evaporation amount of liquid in low-temperature (low temperature) vessel will there will be comparatively significantly fluctuation, finally cause the result of calculation of rate of evaporation to occur deviation.In same place, on the same day in, due to the variation of environmental pressure, the fluctuation of test data can, up to more than 20%, be calculated rate of evaporation if only choose the evaporation capacity of a certain 24 hour period, less than normal or bigger than normal all likely, can not reflect truly the heat-insulating property of container.For so significantly fluctuation, the processing mode that routine is taked is exactly the cycle that extends whole test, by long measurement mean value, reduce the impact of ambient pressure variations, but test period is longer, can bring other problems again, as liquid fullness rate in low-temperature (low temperature) vessel reduces and the impact of generation.In order to reduce ambient pressure variations to the impact of measuring, the normal a kind of measure adopting is installed jumbo buffer tank at mass flowmeter outlet side exactly, but has the following disadvantages:
1) manufacture that jumbo buffer tank difficulty is large, cost is high, and be subject to place restriction, cannot move flexibly.
2) above-mentioned measuring system is a kind of Passive Control mode in essence, and the adjusting time is longer, and the quality of voltage regulation result is subject to the impact of its volume size, cannot thoroughly eliminate the impact of rate of evaporation fluctuation.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low-temperature (low temperature) vessel rate of evaporation system of stable back pressure, solve current low-temperature (low temperature) vessel because back pressure cannot be stablized, cause the technical matters that rate of evaporation error is large, it is by controlling the high-precision voltage stabilizing of mass flowmeter outlet economy, effectively reduce the impact of ambient pressure variations on low-temperature (low temperature) vessel evaporation, it is simple that it has system architecture, the feature that measuring accuracy is high.
The object of the invention is to solve by the following technical programs:
A kind of low-temperature (low temperature) vessel rate of evaporation system of stable back pressure, comprise the gas discharging pipeline being connected with low-temperature (low temperature) vessel gas-phase space, on delivery pipe, be provided with atmospheric valve and mass-flow gas meter, in mass-flow gas meter outlet, be provided with one for stablizing the surge tank of back pressure, on surge tank, be connected with the delivery pipe of logical atmospheric environment, it is characterized in that: described system also comprises that one for regulating the back pressure control system of surge tank pressure, it comprises pressure transducer, Programmable Logic Controller, computing machine, pressure controller, and fast repairing air pipe and Quick air-discharge system, described pressure controller is used for by computing machine and Controlled by Programmable Controller surge tank internal pressure, its input end is connected with computing machine, with the Programmable Logic Controller of pressure setting signal and feedback signal, described pressure controller is also connected with three gas control interfaces, first interface connects Quick air-discharge pipeline, and Quick air-discharge pipeline is for the pressure in fast reducing surge tank, second interface connects quick air compensating system, and air compensating system, for fast to surge tank make-up gas, improves tank internal pressure fast, the 3rd interface taken over and connected surge tank by pressure compensation, the input end of described Programmable Logic Controller is connected with mass-flow gas meter and pressure transducer.
Preferably, the low-temperature (low temperature) vessel rate of evaporation system of above-mentioned stable back pressure, described quick air compensating system is comprised of nitrogen cylinder, reduction valve, air inlet high-speed switch electromagnetic valve and connecting line, nitrogen in nitrogen cylinder is after reduction valve decompression, by air inlet high-speed switch electromagnetic valve, control again, to give surge tank tonifying Qi; Quick air-discharge pipeline consists of high speed exhaust switch electromagnetic valve and the gas outlet that is communicated with ambient atmosphere.
Preferably, the low-temperature (low temperature) vessel rate of evaporation system of above-mentioned stable back pressure, described pressure transducer is absolute pressure transducer, be no more than ± 40Pa of its measuring error, is arranged between surge tank and mass-flow gas meter.
Preferably, the low-temperature (low temperature) vessel rate of evaporation system of above-mentioned stable back pressure, before described mass-flow gas meter, is provided with one for cryogenic gas being heated to the heat interchanger of use.
The invention has the beneficial effects as follows:
The present invention has adopted the high-speed switch electromagnetic valve of feedback control system setting parameter to control air inflow and air capacity, real-time and continuity that tolerance regulates have been realized, effectively guarantee the stable of surge tank internal pressure, reduced the impact of ambient pressure variations on low-temperature (low temperature) vessel evaporation.
Measuring system of the present invention adopts the active voltage stabilizing control mode of air intake-exhaust and the passive voltage stabilizing control mode of surge tank to combine, and controlled processing procedure degree is high, and voltage regulation result is good, and there will not be pressure oscillation.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention.
In figure:
1. low-temperature (low temperature) vessel, 2. blow-down pipe, 3. atmospheric valve, 4. take over, 5. heat interchanger, 6. take over, 7. mass-flow gas meter, 8. flow signal line, 9. take over, 10. pressure transducer, 11. surge tanks, 12. pressure compensations are taken over, 13. delivery pipes, 14. data lines, 15. computing machines, 16. Programmable Logic Controllers, 17. pressure signal lines, 18. pressure feedback signal lines, 19. pressure setting signal lines, 20. feedback control systems regulate control line, 21. pressure controllers, 22. exhaust high-speed switch electromagnetic valves, 23. gas outlets, 24. air inlet high-speed switch electromagnetic valves, 25. draft tube, 26. reduction valve, 27. nitrogen cylinders.
Embodiment
Below in conjunction with above-mentioned accompanying drawing embodiment, the present invention is described in further detail.
Low-temperature (low temperature) vessel 1 is for depositing cryogenic media, as liquid oxygen, liquid nitrogen, because low-temperature (low temperature) vessel 1 can not be accomplished absolute thermal insulation, inevitably can spontaneous evaporation, for accurately measuring the gas flow of discharge vaporization, in Fig. 1 embodiment, on low-temperature (low temperature) vessel 1 discharge pipe, namely, after blow-down pipe 2, atmospheric valve 3 and adapter 4, set gradually heat interchanger 5, adapter 6, mass-flow gas meter 7, adapter 8, surge tank 11, gas is disposed to atmospheric environment by delivery pipe 13 afterwards.This system also comprises that one for regulating the back pressure control system of surge tank 11 pressure, and it comprises pressure transducer 10, Programmable Logic Controller 16, computing machine 15, pressure controller 21, and fast repairing air pipe and Quick air-discharge system; Pressure controller 21 is for controlling surge tank 11 internal pressures by computing machine 15 and Programmable Logic Controller 16, its input end is connected with the computing machine 15 of feedback control system setting parameter, with the Programmable Logic Controller 16 of pressure setting signal and feedback signal, described pressure controller 21 is also connected with three gas control interfaces, first interface connects Quick air-discharge pipeline, and Quick air-discharge pipeline is for the pressure in fast reducing surge tank 11; Second interface connects quick air compensating system, and air compensating system, for fast to buffer tank 11 make-up gas, improves tank internal pressure fast; The 3rd interface connects surge tank 11; The input end of described Programmable Logic Controller 16 is connected with mass-flow gas meter 7 and pressure transducer 10.Air compensating system is comprised of nitrogen cylinder 27, reduction valve 26, air inlet high-speed electromagnetic valve 24 and connecting pipeline fast, and the nitrogen in nitrogen cylinder 27 is controlled to buffer tank 11 tonifying Qi by draft tube 25 and air inlet high-speed electromagnetic valve 24 after reduction valve 26 decompressions; Quick air-discharge pipeline consists of the gas outlet 23 of high-speed switch electromagnetic valve 22He Yu ambient atmosphere UNICOM.
The absolute pressure transducer 10 of high precision, high stability has been installed in the adapter 9 between mass-flow gas meter 7 and surge tank 11, because mass-flow gas meter 7 flow resistances are less, therefore and the flow velocity of boil-off gas is very little, takes over force value that 9 places measure and can think and be equal to the pressure of low-temperature (low temperature) vessel 1 interior gas phase.Owing to having adopted high precision absolute pressure transducer 10, not only improved the precision of measuring, and eliminated the impact that conventional gauge pressure measurement can be subject to ambient pressure variations.
Gaseous mass measured value and pressure measuring value feed back in Programmable Logic Controller 16 by flow signal line 8, pressure signal line 17 respectively, Programmable Logic Controller 16 outputs to computing machine 15 by the parameter value of measurement by data line 14 on the one hand and gathers and record, and computing machine 15 outputs to predefined force value in Programmable Logic Controller by data line 14 simultaneously; On the other hand, Programmable Logic Controller 16 outputs to pressure measuring value, pressure preset value in pressure controller 21 by pressure feedback signal line 18, pressure setting signal line 19 respectively.Pressure controller 21 regulates by feedback control system the feedback control system parameter that control line 20 is given according to computing machine 15, after reduced pressure measured value and pressure preset value, adjust switching frequency and the occupy-place ratio of exhaust high-speed switch electromagnetic valve 22 and air inlet high-speed switch electromagnetic valve 24, and then the air capacity of quick adjustment pressure controller 21 and air inflow, and by pressure compensation, take over 12 and stablize the interior gas gross of surge tank 11, thereby realize the function of stablizing surge tank 11 internal pressures.Owing to adopting the above automatic control measure of stablizing back pressure, effectively reduce the impact of ambient pressure variations on low-temperature (low temperature) vessel 1 rate of evaporation, realized the stability of rate of evaporation.
Measuring system of the present invention, pressure controller 21 is according to pressure feedback value and the predefined force value measured, after comparing, export a deviation control amount and control surge tank 11 is carried out to tonifying Qi, exhaust, measure in real time and Electromagnetic Control, fast response time, in addition, because the action response time of the relative solenoid valve of atmospheric environmental pressure pace of change is a lot of slowly, so surge tank 11 internal pressures will reach balance very soon, so the balance adjustment time is short, generally the adjusting time is no more than 1 minute.In addition, the adjustment that parameter that can be by feedback control system can be to the switching frequency of high-speed switch electromagnetic valve and dutycycle, realizes the continuity to the control of tonifying Qi, exhaust, and voltage regulation result is good.
Measuring system of the present invention, for different back pressure requirements, as long as adjust predefined force value in computing machine 15, pressure controller 21 can be made real-time response, does not need to carry out other and adjusts, and automaticity is high.
Measuring system of the present invention, can realize low-temperature (low temperature) vessel 1 quick on-line monitoring and control to back pressure when rate of evaporation, has automatically, efficient, applicability is wide, be easy to apply.
One skilled in the art would recognize that only unrestricted technical scheme described in the invention is not limited to above form to above embodiment for the present invention is described, the replacement that can also the present invention be modified or is equal to; Technical scheme and improvement thereof that all do not depart from the spirit and scope of the present invention, all will fall into protection scope of the present invention.
Claims (5)
1. the low-temperature (low temperature) vessel rate of evaporation system of a stable back pressure, comprise the gas discharging pipeline being connected with low-temperature (low temperature) vessel (1) gas-phase space, on delivery pipe, be provided with atmospheric valve (3) and mass-flow gas meter (7), in mass-flow gas meter (7) outlet, be provided with one for stablizing the surge tank (11) of back pressure, on surge tank (11), be connected with the delivery pipe (13) of logical atmospheric environment, it is characterized in that: described system also comprises that one for regulating the back pressure control system of surge tank (11) pressure, it comprises pressure transducer (10), Programmable Logic Controller (16), computing machine (15), pressure controller (21), and fast repairing air pipe and Quick air-discharge system, described pressure controller (21) is for controlling surge tank (11) internal pressure by computing machine (15) and Programmable Logic Controller (16), its input end is connected with computing machine (15), with the Programmable Logic Controller (16) of pressure setting signal and feedback signal, described pressure controller (21) is also connected with three gas control interfaces, first interface connects Quick air-discharge pipeline, and Quick air-discharge pipeline is for the pressure in fast reducing surge tank (11), second interface connects quick air compensating system, and air compensating system, for fast to surge tank (11) make-up gas, improves tank internal pressure fast, the 3rd interface taken over (12) by pressure compensation and connected surge tank (11), the input end of described Programmable Logic Controller (16) is connected with mass-flow gas meter (7) and pressure transducer (10).
2. the low-temperature (low temperature) vessel rate of evaporation system of stable back pressure according to claim 1, it is characterized in that: described quick air compensating system is comprised of nitrogen cylinder (27), reduction valve (26), air inlet high-speed switch electromagnetic valve (24) and connecting line, nitrogen in nitrogen cylinder (27) is after reduction valve (26) decompression, by air inlet high-speed switch electromagnetic valve (24), control again, to give surge tank (11) tonifying Qi; Quick air-discharge pipeline consists of high speed exhaust switch electromagnetic valve (22) and the gas outlet (23) that is communicated with ambient atmosphere.
3. the low-temperature (low temperature) vessel rate of evaporation system of stable back pressure according to claim 1 and 2, it is characterized in that: described pressure transducer (10) is absolute pressure transducer, be no more than ± 40Pa of its measuring error, is arranged between surge tank (11) and mass-flow gas meter (7).
4. the low-temperature (low temperature) vessel rate of evaporation system of stable back pressure according to claim 1 and 2, is characterized in that: front at described mass-flow gas meter (7), be provided with one for cryogenic gas being heated to the heat interchanger (5) of use.
5. the low-temperature (low temperature) vessel rate of evaporation system of stable back pressure according to claim 3, is characterized in that: front at described mass-flow gas meter (7), be provided with one for cryogenic gas being heated to the heat interchanger (5) of use.
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| CN201310659152.8A CN103697956A (en) | 2013-12-09 | 2013-12-09 | System for measuring evaporation rate of cryogenic vessel with stable back pressure |
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| CN201310659152.8A CN103697956A (en) | 2013-12-09 | 2013-12-09 | System for measuring evaporation rate of cryogenic vessel with stable back pressure |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104568402A (en) * | 2014-12-15 | 2015-04-29 | 华东理工大学 | Test device and test method for testing release quantity of safety valve of nuclear power voltage stabilizer |
| CN105259209A (en) * | 2015-11-27 | 2016-01-20 | 南京工业大学 | LNG evaporation rate measuring system and calculating method |
| CN105805551A (en) * | 2016-05-09 | 2016-07-27 | 江苏克劳特低温技术有限公司 | Gas cylinder static evaporation rate detecting device and method with BOG recovery function |
| CN106289372A (en) * | 2016-07-21 | 2017-01-04 | 无锡泓瑞航天科技有限公司 | Welded insulated gas cylinder Daily boil-off-rate measuring instrument method of testing |
| CN106382461A (en) * | 2016-10-18 | 2017-02-08 | 江苏克劳特低温技术有限公司 | Liquid-nitrogen-assisted gas cylinder static evaporation rate detection BOG recycling device and method |
| CN107570099A (en) * | 2017-09-28 | 2018-01-12 | 上海国强生化工程装备有限公司 | A kind of tank pressure control device of parallel reactor |
| CN107655670A (en) * | 2017-09-28 | 2018-02-02 | 上海阀门厂股份有限公司 | A kind of safety valve testing device and a kind of safety valve testing method |
| CN109032199A (en) * | 2018-06-26 | 2018-12-18 | 常州大学 | A kind of control pressurer system and compress control method of low pressure phase equilibrium experimental device |
| CN109095418A (en) * | 2018-10-23 | 2018-12-28 | 广州达意隆包装机械股份有限公司 | A kind of control system and control method of bottle placer back pressure |
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| CN113311115A (en) * | 2021-06-22 | 2021-08-27 | 深圳市特种设备安全检验研究院 | Static evaporation rate testing device and method based on low-temperature heat-insulating container |
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Cited By (21)
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| CN104568402B (en) * | 2014-12-15 | 2017-02-22 | 华东理工大学 | Test method of test device for testing release quantity of safety valve of nuclear power voltage stabilizer |
| CN104568402A (en) * | 2014-12-15 | 2015-04-29 | 华东理工大学 | Test device and test method for testing release quantity of safety valve of nuclear power voltage stabilizer |
| CN105259209B (en) * | 2015-11-27 | 2018-07-27 | 南京工业大学 | L NG evaporation rate measuring system and calculating method |
| CN105259209A (en) * | 2015-11-27 | 2016-01-20 | 南京工业大学 | LNG evaporation rate measuring system and calculating method |
| CN105805551A (en) * | 2016-05-09 | 2016-07-27 | 江苏克劳特低温技术有限公司 | Gas cylinder static evaporation rate detecting device and method with BOG recovery function |
| CN105805551B (en) * | 2016-05-09 | 2018-03-27 | 江苏克劳特低温技术有限公司 | A kind of gas cylinder static evaporation rate detection method with BOG recovery functions |
| CN106289372A (en) * | 2016-07-21 | 2017-01-04 | 无锡泓瑞航天科技有限公司 | Welded insulated gas cylinder Daily boil-off-rate measuring instrument method of testing |
| CN106382461A (en) * | 2016-10-18 | 2017-02-08 | 江苏克劳特低温技术有限公司 | Liquid-nitrogen-assisted gas cylinder static evaporation rate detection BOG recycling device and method |
| CN106382461B (en) * | 2016-10-18 | 2018-07-27 | 江苏克劳特低温技术有限公司 | The gas cylinder static evaporation rate detection BOG retracting devices and method of liquid nitrogen auxiliary |
| CN107570099B (en) * | 2017-09-28 | 2023-08-25 | 上海国强生化工程装备有限公司 | Tank pressure control device of parallel reactor |
| CN107570099A (en) * | 2017-09-28 | 2018-01-12 | 上海国强生化工程装备有限公司 | A kind of tank pressure control device of parallel reactor |
| CN107655670A (en) * | 2017-09-28 | 2018-02-02 | 上海阀门厂股份有限公司 | A kind of safety valve testing device and a kind of safety valve testing method |
| CN107655670B (en) * | 2017-09-28 | 2024-02-27 | 上海阀门厂股份有限公司 | Safety valve testing device and safety valve testing method |
| CN109032199A (en) * | 2018-06-26 | 2018-12-18 | 常州大学 | A kind of control pressurer system and compress control method of low pressure phase equilibrium experimental device |
| CN109032199B (en) * | 2018-06-26 | 2021-12-21 | 常州大学 | Pressure control system and pressure control method of low-pressure phase balance experimental device |
| CN109095418B (en) * | 2018-10-23 | 2023-12-15 | 广州达意隆包装机械股份有限公司 | Control system and control method for back pressure of filling machine |
| CN109095418A (en) * | 2018-10-23 | 2018-12-28 | 广州达意隆包装机械股份有限公司 | A kind of control system and control method of bottle placer back pressure |
| CN109596340A (en) * | 2019-01-17 | 2019-04-09 | 深圳市特种设备安全检验研究院 | A kind of additional back pressure type safety valve waste side experimental rig and its test method |
| CN109596340B (en) * | 2019-01-17 | 2024-05-24 | 深圳市质量安全检验检测研究院 | Additional backpressure type safety valve discharge side test device and test method thereof |
| CN110702443A (en) * | 2019-10-23 | 2020-01-17 | 上海惠生海洋工程有限公司 | LNG heat exchanger test system |
| CN113311115A (en) * | 2021-06-22 | 2021-08-27 | 深圳市特种设备安全检验研究院 | Static evaporation rate testing device and method based on low-temperature heat-insulating container |
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Application publication date: 20140402 |