CN207667584U - A kind of controllable air distribution system of mixed gas suitable for tun - Google Patents
A kind of controllable air distribution system of mixed gas suitable for tun Download PDFInfo
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- CN207667584U CN207667584U CN201721352693.6U CN201721352693U CN207667584U CN 207667584 U CN207667584 U CN 207667584U CN 201721352693 U CN201721352693 U CN 201721352693U CN 207667584 U CN207667584 U CN 207667584U
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- 239000007789 gas Substances 0.000 claims abstract description 307
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000001301 oxygen Substances 0.000 claims abstract description 71
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 71
- 239000011261 inert gas Substances 0.000 claims abstract description 66
- 238000004891 communication Methods 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 105
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 62
- 238000002156 mixing Methods 0.000 claims description 61
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 58
- 239000003638 chemical reducing agent Substances 0.000 claims description 41
- 238000001914 filtration Methods 0.000 claims description 38
- 229910052786 argon Inorganic materials 0.000 claims description 31
- 238000005070 sampling Methods 0.000 claims description 30
- 229910052757 nitrogen Inorganic materials 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 11
- 238000009849 vacuum degassing Methods 0.000 claims description 10
- 230000002829 reductive effect Effects 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 238000007872 degassing Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000006837 decompression Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 9
- UHZZMRAGKVHANO-UHFFFAOYSA-M chlormequat chloride Chemical compound [Cl-].C[N+](C)(C)CCCl UHZZMRAGKVHANO-UHFFFAOYSA-M 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000003595 mist Substances 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011418 maintenance treatment Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Sampling And Sample Adjustment (AREA)
Abstract
The utility model provides a kind of controllable air distribution system of the mixed gas suitable for tun, including PLC controller, with the host computer of PLC controller communication connection, the oxygen distribution subsystem being electrically connected with PLC controller, inert gas distribution subsystem, switch valve module, gas pre-mixed and device, the main blend tank of gas, oxygen distribution compensating unit and inert gas distribution compensating unit, oxygen and inert gas distribution subsystem are connect with gas pre-mixed and device, gas pre-mixed and device is connect by switching valve module with the main blend tank of gas, oxygen and inert gas distribution compensating unit and the pipeline connection close to the main blend tank of gas.This system realizes automation control and intelligent adjusting during distribution, allocation ratio precision is high, execute-in-place is safe, the time for saving pre-mix stage improves the air distribution efficiency of whole system, especially for the main blend tank of gas volume it is larger when be applicable in very much, the distribution company especially suitable for profession or large-scale distribution website.
Description
Technical Field
The utility model relates to a distribution technical field, concretely relates to controllable gas distribution system of mist suitable for large container.
Background
The AOD refining method is abbreviated as Argon-Oxygen Decarburization (Argon-Oxygen Decarburization). When stainless steel is refined, oxygen is blown into molten steel under standard atmospheric pressure, and simultaneously inert gases such as argon or nitrogen are blown into the molten steel, so that the partial pressure of carbon and oxygen is reduced to achieve the effect of pseudo vacuum, thereby reducing the carbon content to a very low level and inhibiting the oxidation of chromium in the steel. However, when blowing oxygen into molten steel under normal atmospheric pressure and blowing inert gas argon or nitrogen into molten steel, the distribution of oxygen and inert gas needs to be realized through a distribution system.
However, the inventor of the present invention found through research that the gas distribution device for oxygen and inert gas is operated manually, when filling one of the components, the operator must constantly pay attention to the pressure gauge value on the panel of the device and the weight value on the electronic balance, and when the value is close to the pre-calculated fixed value, the operator should rapidly and manually turn off the valve arranged on the gas inlet pipe, and simultaneously screw down the valve of the steel cylinder, until all the components are filled into the finished gas cylinder. The component concentration of the mixed gas can reach 10 at most-6And when the valve on the air inlet pipe and the steel cylinder valve are manually closed, the inflow of the gas has large error, so that the uncertainty of the oxygen and the inert gas is large, and the accuracy of the quantity value is reduced. And the mixed gas component can reach a plurality of components at most sometimes, each component raw gas needs to be respectively filled into a finished product gas cylinder, when the component gas filled firstly is weighed to exceed a pre-calculated value due to the error that an operator cannot close a valve timely or reversely screw the valve, all gas components needing to be filled later need to be correspondingly adjusted again, and when the value exceeds too much, the gas components can not be compensated, the gas components need to be abandoned by the cylinder and then be made again, so that the raw material waste is caused. In addition, some gas components may be harmful gases, and if the operator does not close the device valve and the cylinder valve at the same time, gas leakage may occur, which may present a safety hazard.
Therefore, the prior gas distribution device for the mixed gas of the oxygen and the inert gas has low automation degree, poor intelligence degree, low precision of configuration proportion and low safety of field operation.
SUMMERY OF THE UTILITY MODEL
The gas distribution device to oxygen and inert gas mist that prior art exists degree of automation is low, and intelligent degree is poor, and configuration proportion precision is low, the technical problem that field operation security is low, the utility model provides a novel controllable gas distribution system of mist suitable for large container.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a mixed gas controllable distribution system suitable for large containers comprises an oxygen distribution branch system, an inert gas distribution branch system, a switch valve assembly, a gas premixer, a gas main mixing tank, an oxygen distribution compensation unit, an inert gas distribution compensation unit, a PLC controller and an upper computer; wherein,
the oxygen distribution branch system comprises an oxygen tank, a first pressure gauge, a first filtering pressure reducer, a first pressure reducing valve, a first stop valve, a first one-way valve, a first pneumatic regulating valve, a first electrical converter and an oxygen flow meter, the oxygen tank is connected to the inlet of the first stop valve after being filtered by the first filtering pressure reducer and decompressed by the first decompression valve, the outlet of the first stop valve is connected to the inlet of the first pneumatic regulating valve through a first one-way valve, the outlet of the first pneumatic regulating valve is connected with an oxygen flow meter, the first pressure gauge is connected on the oxygen conveying pipeline between the oxygen tank and the first filtering pressure reducer, the air source end of the first electric converter is connected with the first filtering pressure reducer, the air end of the first electric converter is connected with the valve core of the first air regulating valve, and the telecommunication end of the first electric converter is electrically connected with the PLC;
the inert gas distribution branch system comprises an argon gas distribution subsystem, a nitrogen gas distribution subsystem and an inert gas pneumatic three-way regulating valve; wherein the argon gas distribution subsystem comprises an argon gas tank, a second pressure gauge, a second filtering pressure reducer, a second pressure reducing valve, a second stop valve, a second one-way valve, a second pneumatic regulating valve, a second electrical converter and an argon gas flowmeter, the argon tank is filtered by the second filtering pressure reducer and is connected to the inlet of the second stop valve after being reduced by the second reducing valve, the outlet of the second stop valve is connected to the inlet of a second pneumatic regulating valve through a second one-way valve, the outlet of the second pneumatic regulating valve is connected with an argon flow meter, the second pressure gauge is connected on the argon conveying pipeline between the argon tank and the second filtering pressure reducer, the air source end of the second electrical converter is connected with the second filtering pressure reducer, the pneumatic end of the second electrical converter is connected with the valve core of the second pneumatic regulating valve, and the telecommunication end of the second electrical converter is electrically connected with the PLC;
the nitrogen distribution subsystem comprises a nitrogen tank, a third pressure gauge, a third filtering pressure reducer, a third pressure reducing valve, a third stop valve, a third one-way valve, a third pneumatic regulating valve, a third electrical converter and a nitrogen flow meter, the nitrogen tank is connected to the inlet of a third stop valve after being filtered by a third filtering pressure reducer and decompressed by a third pressure reducing valve, the outlet of the third stop valve is connected to the inlet of a third pneumatic regulating valve through a third one-way valve, the outlet of the third pneumatic regulating valve is connected with a nitrogen flow meter, the third pressure gauge is connected on a nitrogen conveying pipeline between the nitrogen tank and the third filtering pressure reducer, the air source end of the third electrical converter is connected with a third filtering pressure reducer, the pneumatic end of the third electrical converter is connected with the valve core of a third pneumatic regulating valve, and the telecommunication end of the third electrical converter is electrically connected with the PLC;
a first air inlet of the inert gas pneumatic three-way regulating valve is connected to an outlet of the second pneumatic regulating valve, a second air inlet of the inert gas pneumatic three-way regulating valve is connected to an outlet of the third pneumatic regulating valve, and an air outlet of the inert gas pneumatic three-way regulating valve and an outlet of the first pneumatic regulating valve are simultaneously connected to an air inlet of the gas premixer;
the gas premixing device is provided with a vacuum exhaust unit, a gas sampling unit and a pressure detection unit, wherein the vacuum exhaust unit comprises a first pneumatic switch valve, a first vacuum solenoid valve and a first vacuum pump which are sequentially connected, the first pneumatic switch valve is connected with an exhaust port on the gas premixing device, and the vacuum exhaust unit is suitable for vacuum-exhausting residual gas in the gas premixing device before gas premixing; the gas sampling unit comprises a sampling switch valve, a sampling pump and a gas concentration analyzer which are sequentially connected, the gas concentration analyzer is electrically connected with the PLC, the sampling switch valve is connected with a sampling port on the gas premixer, and the gas sampling unit is suitable for sampling mixed gas in the gas premixer in gas premixing; the pressure detection unit comprises a pressure switch valve, a pneumatic stop valve and a pressure transmitter which are sequentially connected, the pressure transmitter is electrically connected with the PLC, the pressure switch valve is connected with a pressure port on the gas premixer, and the pressure detection unit is suitable for detecting the mixed gas pressure in the gas premixer in gas premixing;
the switch valve assembly comprises a first electromagnetic switch valve, an air inlet of the first electromagnetic switch valve is connected with an air delivery port of the gas premixer, an air outlet of the first electromagnetic switch valve is connected with an air inlet of the gas main mixing tank, and the first electromagnetic switch valve is electrically connected with the PLC;
the volume of the gas main mixing tank is far larger than that of the gas premixer, the gas main mixing tank comprises a vacuum degassing unit, a gas concentration measuring unit and a pressure measuring unit, the vacuum degassing unit comprises a second pneumatic switch valve, a second vacuum solenoid valve and a second vacuum pump which are sequentially connected, the second pneumatic switch valve is connected with a degassing port on the gas main mixing tank, and the vacuum degassing unit is suitable for removing residual gas in the gas main mixing tank in a vacuum mode before gas main mixing; the gas concentration measuring unit comprises an ultrasonic oxygen concentration sensor and an ultrasonic inert gas concentration sensor which are arranged on the wall surface of the gas main mixing tank, the ultrasonic oxygen concentration sensor and the ultrasonic inert gas concentration sensor are electrically connected with the PLC, and the gas concentration measuring unit is suitable for measuring the concentrations of oxygen and inert gas in the gas main mixing; the pressure measuring unit is an ultrasonic gas pressure sensor arranged on the wall surface of the gas main mixing tank, the ultrasonic gas pressure sensor is electrically connected with the PLC, and the pressure measuring unit is suitable for measuring the mixed gas pressure in the gas main mixing tank in the gas main mixing;
the oxygen distribution compensation unit comprises an oxygen compressor, an oxygen buffer and a first automatic regulating valve which are connected in sequence, and the first automatic regulating valve is communicated with a pipeline close to the gas main mixing tank; the inert gas distribution compensation unit comprises an inert gas compressor, an inert gas buffer and a second automatic regulating valve which are sequentially connected, the second automatic regulating valve is also communicated with a pipeline close to the gas main mixing tank, and the first automatic regulating valve and the second automatic regulating valve are respectively and electrically connected with the PLC;
the PLC is suitable for comparing the mixed gas proportion measured by the gas concentration analyzer on the gas premixer in an online sampling manner with a preset mixed gas proportion, and controlling the first electric converter, the second electric converter and the third electric converter in real time so as to adjust the opening degrees of the first pneumatic regulating valve, the second pneumatic regulating valve and the third pneumatic regulating valve;
the upper computer is in communication connection with the PLC, the upper computer comprises a touch display screen and a data memory, the touch display screen is suitable for setting gas distribution parameters including the proportion of the target mixed gas and displaying process data, and the data memory is suitable for storing various gas distribution process data including valve parameters uploaded by the PLC.
Compared with the prior art, the utility model provides a controllable gas distribution system of mist suitable for large-scale container, compare with the target mixture ratio proportion of settlement according to the online mixed gas mixture ratio analysis result of gas concentration analysis appearance, the PLC controller passes through first electrical converter, second electrical converter and third electrical converter, correspond the aperture of automatically regulated first pneumatic control valve, second pneumatic control valve and third pneumatic control valve respectively, and electrical converter can high accurate regulation pneumatic control valve's aperture, therefore realized automatic control and intelligent regulation in the distribution process, no longer need frequent manual control of operating personnel, the configuration proportion precision is high, the field operation security is high, and when the ratio of mist reaches the preset requirement, the PLC controller controls first electromagnetic switch valve and switches to the conducting state by the off-state, namely, the formal gas distribution of the mixed gas is completed in the gas main mixing tank, so that the proportion precision of the whole gas distribution system is improved; meanwhile, the gas concentration and the pressure of the gas main mixing tank in the formal gas distribution process can be measured to prevent the occurrence of the conditions of low gas proportion and low pressure, and when the proportion of the mixed gas has slight deviation, the PLC controller can control the first automatic regulating valve or the second automatic regulating valve to be automatically opened, and oxygen or inert gas with a small proportion is added into the gas main mixing tank for compensation, so that the rapid and stable adjustment of the proportion deviation of the mixed gas is realized, the uniform mixing of the prepared gas is ensured, and the accurate and controllable completion of the whole formal gas distribution process is ensured; in addition, the volume of the gas main mixing tank is far larger than that of the gas premixer, namely, the gas premixer with smaller volume is adopted to complete the proportion analysis of the mixed gas and the adjustment of the corresponding pneumatic regulating valve, so that the proportion of the mixed gas reaches the preset requirement as soon as possible, and the mixed gas is input into the gas main mixing tank to formally complete the gas distribution when the proportion of the gas meets the requirement, thereby reducing the time spent by direct premixing due to overlarge volume of the gas main mixing tank, saving the time of a premixing stage and improving the gas distribution efficiency of the whole system.
Further, the switch valve assembly further comprises a second electromagnetic switch valve, an air inlet of the second electromagnetic switch valve is connected with an air outlet of the inert gas pneumatic three-way regulating valve and an outlet of the first pneumatic regulating valve, and an air outlet of the second electromagnetic switch valve is connected with the gas premixing device.
Further, a gas emptying unit is further arranged on the gas premixing device and is a pneumatic electromagnetic valve connected with an emptying port on the gas premixing device.
Further, the PLC controller adopts Siemens S7-200 series PLC.
Drawings
Fig. 1 is a schematic structural diagram of a mixed gas controllable distribution system suitable for a large container.
Fig. 2 is a schematic diagram of the oxygen and inert gas distribution subsystem of fig. 1.
In the figure, 1, an oxygen distribution branch system; 10. an oxygen tank; 11. a first pressure gauge; 12. a first filtering pressure reducer; 13. a first pressure reducing valve; 14. a first shut-off valve; 15. a first check valve; 16. a first pneumatic regulating valve; 17. a first electrical converter; 18. an oxygen flow meter; 2. an inert gas distribution subsystem; 21. an argon distribution subsystem; 210. an argon tank; 211. a second pressure gauge; 212. a second filtering pressure reducer; 213. a second pressure reducing valve; 214. a second stop valve; 215. a second one-way valve; 216. a second pneumatic regulating valve; 217. a second electrical converter; 218. an argon gas flow meter; 22. a nitrogen distribution subsystem; 220. a nitrogen tank; 221. a third pressure gauge; 222. a third filtering pressure reducer; 223. a third pressure reducing valve; 224. a third stop valve; 225. a third check valve; 226. a third pneumatic regulating valve; 227. a third electrical converter; 228. a nitrogen flow meter; 23. an inert gas pneumatic three-way regulating valve; 3. a switch valve assembly; 31. a first electromagnetic on-off valve; 32. a second electromagnetic on-off valve; 4. a gas premixer; 41. a vacuum exhaust unit; 411. a first pneumatic switching valve; 412. a first vacuum solenoid valve; 413. a first vacuum pump; 42. a gas sampling unit; 421. a sampling switch valve; 422. a sampling pump; 423. a gas concentration analyzer; 43. a pressure detection unit; 431. a pressure switching valve; 432. a pneumatic stop valve; 433. a pressure transmitter; 44. a gas evacuation unit; 5. a gas main mixing tank; 51. a vacuum degassing unit; 511. a second pneumatic switching valve; 512. a second vacuum solenoid valve; 513. a second vacuum pump; 52. a gas concentration measuring unit; 521. an ultrasonic oxygen concentration sensor; 522. an ultrasonic inert gas concentration sensor; 53. a pressure measurement unit; 6. an oxygen distribution compensation unit; 61. an oxygen compressor; 62. an oxygen buffer; 63. a first self-regulating valve; 7. an inert gas distribution compensation unit; 71. an inert gas compressor; 72. an inert gas buffer; 73. a second self-regulating valve; 8. a PLC controller; 9. and (4) an upper computer.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.
In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present invention provides a mixed gas controllable distribution system suitable for large containers, which includes an oxygen distribution subsystem 1, an inert gas distribution subsystem 2, a switch valve assembly 3, a gas pre-mixer 4, a gas main mixing tank 5, an oxygen distribution compensation unit 6, an inert gas distribution compensation unit 7, a PLC controller 8 and an upper computer 9; wherein,
the oxygen distribution branch system 1 comprises an oxygen tank 10, a first pressure gauge 11, a first filtering pressure reducer 12, a first pressure reducing valve 13, a first stop valve 14, a first check valve 15, a first pneumatic regulating valve 16, a first electric converter 17 and an oxygen flow meter 18, wherein the oxygen tank 10 is connected to an inlet of the first stop valve 14 after being filtered by the first filtering pressure reducer 12 and subjected to pressure reduction by the first pressure reducing valve 13, an outlet of the first stop valve 14 is connected to an inlet of the first pneumatic regulating valve 16 through the first check valve 15, an outlet of the first pneumatic regulating valve 16 is connected with the oxygen flow meter 18, the first pressure gauge 11 is connected to an oxygen conveying pipeline between the oxygen tank 10 and the first filtering pressure reducer 12, a gas source end of the first electric converter 17 is connected with a valve core of the first pneumatic regulating valve 16, the telecommunication end of the first electric converter 17 is electrically connected with the PLC controller 8; namely, the first filter pressure reducer 12 is an air source of a first electrical converter 17, and the first electrical converter 17 converts a control electrical signal sent by the PLC controller 8 into an air pressure signal to adjust a valve element of the first pneumatic regulating valve 16 to be in direct proportion to the air pressure signal, so as to regulate oxygen to a required flow rate;
the inert gas distribution subsystem 2 comprises an argon gas distribution subsystem 21, a nitrogen gas distribution subsystem 22 and an inert gas pneumatic three-way regulating valve 23; wherein, the argon gas distribution subsystem 21 comprises an argon gas tank 210, a second pressure gauge 211, a second filtering pressure reducer 212, a second pressure reducing valve 213, a second stop valve 214, a second check valve 215, a second pneumatic regulating valve 216, a second electrical converter 217 and an argon gas flowmeter 218, the argon gas tank 210 is connected to the inlet of the second stop valve 214 after being filtered by the second filtering pressure reducer 212 and being reduced in pressure by the second pressure reducing valve 213, the outlet of the second stop valve 214 is connected to the inlet of the second pneumatic regulating valve 216 through the second check valve 215, the outlet of the second pneumatic regulating valve 216 is connected with the argon gas flowmeter 218, the second pressure gauge 211 is connected to an argon gas conveying pipe between the argon gas tank 210 and the second filtering pressure reducer 212, the gas source end of the second electrical converter 217 is connected with the second filtering pressure reducer 212, the pneumatic end of the second electrical converter 217 is connected with the valve core of the second pneumatic regulating valve 216, the telecommunication end of the second electrical converter 217 is electrically connected with the PLC controller 8; namely, the second filter pressure reducer 212 is a gas source of a second electrical converter 217, and the second electrical converter 217 converts a control electrical signal sent by the PLC controller 8 into a gas pressure signal so as to adjust a valve element of the second pneumatic adjusting valve 216 to be in direct proportion to the gas pressure signal and adjust the argon gas to a required flow rate;
the nitrogen distribution subsystem 22 comprises a nitrogen tank 220, a third pressure gauge 221, a third filtering pressure reducer 222, a third pressure reducing valve 223, a third stop valve 224, a third check valve 225, a third pneumatic regulating valve 226, a third electric converter 227 and a nitrogen flow meter 228, wherein the nitrogen tank 220 is connected to an inlet of the third stop valve 224 after being filtered by the third filtering pressure reducer 222 and being subjected to pressure reduction by the third pressure reducing valve 223, an outlet of the third stop valve 224 is connected to an inlet of the third pneumatic regulating valve 226 through the third check valve 225, an outlet of the third pneumatic regulating valve 226 is connected with the nitrogen flow meter 228, the third pressure gauge 221 is connected to a nitrogen conveying pipe between the nitrogen tank 220 and the third filtering pressure reducer 222, an air source end of the third electric converter 227 is connected with the third filtering pressure reducer 222, a pneumatic end of the third electric converter 227 is connected with a valve core of the third pneumatic regulating valve 226, the telecommunication end of the third electrical converter 227 is electrically connected with the PLC controller 8; namely, the third filter pressure reducer 222 is a gas source of the third electrical converter 227, and the third electrical converter 227 converts the control electrical signal sent by the PLC controller 8 into a gas pressure signal, so as to adjust the valve element of the third pneumatic regulating valve 226 to be in direct proportion to the gas pressure signal, and regulate the nitrogen gas to the required flow rate;
a first air inlet of the inert gas pneumatic three-way regulating valve 23 is connected to an outlet of the second pneumatic regulating valve 216, a second air inlet of the inert gas pneumatic three-way regulating valve 23 is connected to an outlet of the third pneumatic regulating valve 226, that is, the input selection of argon and nitrogen can be realized through the inert gas pneumatic three-way regulating valve 23, and an air outlet of the inert gas pneumatic three-way regulating valve 23 and an outlet of the first pneumatic regulating valve 16 are simultaneously connected to an air inlet of the gas premixer 4;
the gas premixer 4 is provided with a vacuum exhaust unit 41, a gas sampling unit 42 and a pressure detection unit 43, the vacuum exhaust unit 41 comprises a first pneumatic switch valve 411, a first vacuum solenoid valve 412 and a first vacuum pump 413 which are connected in sequence, the first pneumatic switch valve 411 is connected with an exhaust port on the gas premixer 4, and the vacuum exhaust unit 41 is adapted to vacuum exhaust residual gas in the gas premixer 4 before gas premixing; the gas sampling unit 42 comprises a sampling switch valve 421, a sampling pump 422 and a gas concentration analyzer 423 which are connected in sequence, the gas concentration analyzer 423 is electrically connected with the PLC 8, the sampling switch valve 421 is connected with a sampling port on the gas premixer 4, and the gas sampling unit 42 is suitable for sampling the mixed gas in the gas premixer 4 in the gas premixing; the pressure detection unit 43 comprises a pressure switch valve 431, a pneumatic stop valve 432 and a pressure transmitter 433 which are connected in sequence, the pressure transmitter 433 is electrically connected with the PLC 8, the pressure switch valve 431 is connected with a pressure port on the gas premixer 4, and the pressure detection unit 43 is suitable for detecting the mixed gas pressure in the gas premixer 4 during gas premixing;
the switch valve assembly 3 comprises a first electromagnetic switch valve 31, an air inlet of the first electromagnetic switch valve 31 is connected with an air delivery port of the gas premixer 4, an air outlet of the first electromagnetic switch valve 31 is connected with an air inlet of the gas main mixing tank 5, and the first electromagnetic switch valve 31 is electrically connected with the PLC 8;
the volume of the gas main mixing tank 5 is much larger than that of the gas premixer 4, the gas main mixing tank 5 comprises a vacuum degassing unit 51, a gas concentration measuring unit 52 and a pressure measuring unit 53, the vacuum degassing unit 51 comprises a second pneumatic switch valve 511, a second vacuum solenoid valve 512 and a second vacuum pump 513 which are connected in sequence, the second pneumatic switch valve 511 is connected with a degassing port on the gas main mixing tank 5, and the vacuum degassing unit 51 is adapted to remove residual gas in the gas main mixing tank 5 in vacuum before gas main mixing; the gas concentration measuring unit 52 comprises an ultrasonic oxygen concentration sensor 521 and an ultrasonic inert gas concentration sensor 522 which are arranged on (e.g. bonded or welded) the wall surface of the gas main mixing tank 5, the ultrasonic oxygen concentration sensor 521 and the ultrasonic inert gas concentration sensor 522 are electrically connected with the PLC controller 8, and the gas concentration measuring unit 52 is suitable for measuring the concentrations of oxygen and inert gas in the gas main mixing; the pressure measuring unit 53 is an ultrasonic gas pressure sensor disposed (e.g., bonded or welded) on the wall surface of the gas main mixing tank 5, the ultrasonic gas pressure sensor is electrically connected to the PLC controller 8, and the pressure measuring unit 53 is adapted to measure the mixed gas pressure in the gas main mixing tank 5 during gas main mixing;
the oxygen distribution compensation unit 6 comprises an oxygen compressor 61, an oxygen buffer 62 and a first automatic regulating valve 63 which are connected in sequence, wherein the first automatic regulating valve 63 is communicated with a pipeline close to the gas main mixing tank 5, so that oxygen can enter the oxygen buffer 62 for buffering after being compressed by the oxygen compressor 61; the inert gas distribution compensation unit 7 comprises an inert gas compressor 71, an inert gas buffer 72 and a second automatic regulating valve 73 which are connected in sequence, the second automatic regulating valve 73 is also communicated with a pipeline close to the gas main mixing tank 5, so that the inert gas can enter the inert gas buffer 72 for buffering after being compressed by the inert gas compressor 71, and the first automatic regulating valve 63 and the second automatic regulating valve 73 are respectively and electrically connected with the PLC 8;
the PLC controller 8 is adapted to collect gas concentration and pressure signals in the gas premixer 4 and the gas main mixing tank 5, compare a mixed gas ratio measured by an online sampling analyzer 423 on the gas premixer 4 with a preset mixed gas ratio, and control the first electrical converter 17, the second electrical converter 217 and the third electrical converter 227 in real time to adjust the opening degrees of the first pneumatic regulating valve 16, the second pneumatic regulating valve 216 and the third pneumatic regulating valve 226, that is, adjust the opening degree of the pneumatic switch valve through the electrical converters, and when the ratio of the mixed gas meets a preset requirement, the PLC controller 8 controls the first electromagnetic switch valve 31 to be switched from a closed state to a conducting state;
the upper computer 9 is in communication connection with the PLC controller 8, the upper computer 9 comprises a touch display screen and a data memory, the touch display screen is suitable for setting gas distribution parameters including a target mixed gas proportioning ratio and displaying process data, preset gas distribution parameters are downloaded to the PLC controller 8, the data memory is suitable for storing various gas distribution process data including valve parameters, and therefore gas distribution setting can be rapidly completed through one-key extraction in the next same-proportion gas distribution process.
Compared with the prior art, the utility model provides a controllable gas distribution system of mist suitable for large-scale container, compare with the target mixture ratio proportion of settlement according to the online mixed gas mixture ratio analysis result of gas concentration analysis appearance, the PLC controller passes through first electrical converter, second electrical converter and third electrical converter, correspond the aperture of automatically regulated first pneumatic control valve, second pneumatic control valve and third pneumatic control valve respectively, and electrical converter can high accurate regulation pneumatic control valve's aperture, therefore realized automatic control and intelligent regulation in the distribution process, no longer need frequent manual control of operating personnel, the configuration proportion precision is high, the field operation security is high, and when the ratio of mist reaches the preset requirement, the PLC controller controls first electromagnetic switch valve and switches to the conducting state by the off-state, namely, the formal gas distribution of the mixed gas is completed in the gas main mixing tank, so that the proportion precision of the whole gas distribution system is improved; meanwhile, the gas concentration and the pressure of the gas main mixing tank in the formal gas distribution process can be measured to prevent the occurrence of the conditions of low gas proportion and low pressure, and when the proportion of the mixed gas has slight deviation, the PLC controller can control the first automatic regulating valve or the second automatic regulating valve to be automatically opened, and oxygen or inert gas with a small proportion is added into the gas main mixing tank for compensation, so that the rapid and stable adjustment of the proportion deviation of the mixed gas is realized, the uniform mixing of the prepared gas is ensured, and the accurate and controllable completion of the whole formal gas distribution process is ensured; in addition, the volume of the gas main mixing tank is far larger than that of the gas premixer, namely, the gas premixer with smaller volume is adopted to complete the proportion analysis of the mixed gas and the adjustment of the corresponding pneumatic regulating valve, so that the proportion of the mixed gas reaches the preset requirement as soon as possible, and the mixed gas is input into the gas main mixing tank to formally complete the gas distribution when the proportion of the gas meets the requirement, thereby reducing the time spent by direct premixing due to overlarge volume of the gas main mixing tank, saving the time of a premixing stage and improving the gas distribution efficiency of the whole system.
As a specific embodiment, the switch valve assembly 3 further includes a second electromagnetic switch valve 32, an air inlet of the second electromagnetic switch valve 32 is connected to the air outlet of the inert gas pneumatic three-way regulating valve 23 and the outlet of the first pneumatic regulating valve 16, and an air outlet of the second electromagnetic switch valve 32 is connected to the gas premixer 4, so that when an abnormal condition occurs or maintenance is required in the gas premixer 4 and/or the gas main mixing tank 5, a pipeline connecting the gas premixer 4 and the gas main mixing tank 5 can be shut off through the second electromagnetic switch valve 32, thereby providing convenience for emergency treatment or maintenance treatment.
As a specific embodiment, the gas premixer 4 is further provided with a gas evacuation unit 44, and the gas evacuation unit 44 is a pneumatic solenoid valve connected to an evacuation port of the gas premixer 4, so that the mixed gas in the gas premixer 4 after pre-mixing can be evacuated through the pneumatic solenoid valve.
As a specific embodiment, the PLC controller 8 adopts Siemens S7-200 series PLC, Siemens S7-200PLC has the characteristics of high speed, communication function and high productivity in a real-time mode, and automatic gas distribution software is loaded in an S7-200PLC host machine, so that the full-machine switching value, analog input and output, data detection, calculation and process control can be completed, and the automation of a gas distribution process and the safety monitoring of process data are realized.
As a specific embodiment, the touch display screen in the upper computer 9 is a siemens MP277 touch screen, and the MP277 touch screen communicates with the PLC controller 8 by using a PPI protocol, so that the setting of gas distribution parameters including the target mixture gas ratio can be completed, and the display of various process data can be realized.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (4)
1. A mixed gas controllable distribution system suitable for large containers is characterized by comprising an oxygen distribution branch system, an inert gas distribution branch system, a switch valve assembly, a gas pre-mixer, a gas main mixing tank, an oxygen distribution compensation unit, an inert gas distribution compensation unit, a PLC (programmable logic controller) and an upper computer; wherein,
the oxygen distribution branch system comprises an oxygen tank, a first pressure gauge, a first filtering pressure reducer, a first pressure reducing valve, a first stop valve, a first one-way valve, a first pneumatic regulating valve, a first electrical converter and an oxygen flow meter, the oxygen tank is connected to the inlet of the first stop valve after being filtered by the first filtering pressure reducer and decompressed by the first decompression valve, the outlet of the first stop valve is connected to the inlet of the first pneumatic regulating valve through a first one-way valve, the outlet of the first pneumatic regulating valve is connected with an oxygen flow meter, the first pressure gauge is connected on the oxygen conveying pipeline between the oxygen tank and the first filtering pressure reducer, the air source end of the first electric converter is connected with the first filtering pressure reducer, the air end of the first electric converter is connected with the valve core of the first air regulating valve, and the telecommunication end of the first electric converter is electrically connected with the PLC;
the inert gas distribution branch system comprises an argon gas distribution subsystem, a nitrogen gas distribution subsystem and an inert gas pneumatic three-way regulating valve; wherein the argon gas distribution subsystem comprises an argon gas tank, a second pressure gauge, a second filtering pressure reducer, a second pressure reducing valve, a second stop valve, a second one-way valve, a second pneumatic regulating valve, a second electrical converter and an argon gas flowmeter, the argon tank is filtered by the second filtering pressure reducer and is connected to the inlet of the second stop valve after being reduced by the second reducing valve, the outlet of the second stop valve is connected to the inlet of a second pneumatic regulating valve through a second one-way valve, the outlet of the second pneumatic regulating valve is connected with an argon flow meter, the second pressure gauge is connected on the argon conveying pipeline between the argon tank and the second filtering pressure reducer, the air source end of the second electrical converter is connected with the second filtering pressure reducer, the pneumatic end of the second electrical converter is connected with the valve core of the second pneumatic regulating valve, and the telecommunication end of the second electrical converter is electrically connected with the PLC;
the nitrogen distribution subsystem comprises a nitrogen tank, a third pressure gauge, a third filtering pressure reducer, a third pressure reducing valve, a third stop valve, a third one-way valve, a third pneumatic regulating valve, a third electrical converter and a nitrogen flow meter, the nitrogen tank is connected to the inlet of a third stop valve after being filtered by a third filtering pressure reducer and decompressed by a third pressure reducing valve, the outlet of the third stop valve is connected to the inlet of a third pneumatic regulating valve through a third one-way valve, the outlet of the third pneumatic regulating valve is connected with a nitrogen flow meter, the third pressure gauge is connected on a nitrogen conveying pipeline between the nitrogen tank and the third filtering pressure reducer, the air source end of the third electrical converter is connected with a third filtering pressure reducer, the pneumatic end of the third electrical converter is connected with the valve core of a third pneumatic regulating valve, and the telecommunication end of the third electrical converter is electrically connected with the PLC;
a first air inlet of the inert gas pneumatic three-way regulating valve is connected to an outlet of the second pneumatic regulating valve, a second air inlet of the inert gas pneumatic three-way regulating valve is connected to an outlet of the third pneumatic regulating valve, and an air outlet of the inert gas pneumatic three-way regulating valve and an outlet of the first pneumatic regulating valve are simultaneously connected to an air inlet of the gas premixer;
the gas premixing device is provided with a vacuum exhaust unit, a gas sampling unit and a pressure detection unit, wherein the vacuum exhaust unit comprises a first pneumatic switch valve, a first vacuum solenoid valve and a first vacuum pump which are sequentially connected, the first pneumatic switch valve is connected with an exhaust port on the gas premixing device, and the vacuum exhaust unit is suitable for vacuum-exhausting residual gas in the gas premixing device before gas premixing; the gas sampling unit comprises a sampling switch valve, a sampling pump and a gas concentration analyzer which are sequentially connected, the gas concentration analyzer is electrically connected with the PLC, the sampling switch valve is connected with a sampling port on the gas premixer, and the gas sampling unit is suitable for sampling mixed gas in the gas premixer in gas premixing; the pressure detection unit comprises a pressure switch valve, a pneumatic stop valve and a pressure transmitter which are sequentially connected, the pressure transmitter is electrically connected with the PLC, the pressure switch valve is connected with a pressure port on the gas premixer, and the pressure detection unit is suitable for detecting the mixed gas pressure in the gas premixer in gas premixing;
the switch valve assembly comprises a first electromagnetic switch valve, an air inlet of the first electromagnetic switch valve is connected with an air delivery port of the gas premixer, an air outlet of the first electromagnetic switch valve is connected with an air inlet of the gas main mixing tank, and the first electromagnetic switch valve is electrically connected with the PLC;
the volume of the gas main mixing tank is far larger than that of the gas premixer, the gas main mixing tank comprises a vacuum degassing unit, a gas concentration measuring unit and a pressure measuring unit, the vacuum degassing unit comprises a second pneumatic switch valve, a second vacuum solenoid valve and a second vacuum pump which are sequentially connected, the second pneumatic switch valve is connected with a degassing port on the gas main mixing tank, and the vacuum degassing unit is suitable for removing residual gas in the gas main mixing tank in a vacuum mode before gas main mixing; the gas concentration measuring unit comprises an ultrasonic oxygen concentration sensor and an ultrasonic inert gas concentration sensor which are arranged on the wall surface of the gas main mixing tank, the ultrasonic oxygen concentration sensor and the ultrasonic inert gas concentration sensor are electrically connected with the PLC, and the gas concentration measuring unit is suitable for measuring the concentrations of oxygen and inert gas in the gas main mixing; the pressure measuring unit is an ultrasonic gas pressure sensor arranged on the wall surface of the gas main mixing tank, the ultrasonic gas pressure sensor is electrically connected with the PLC, and the pressure measuring unit is suitable for measuring the mixed gas pressure in the gas main mixing tank in the gas main mixing;
the oxygen distribution compensation unit comprises an oxygen compressor, an oxygen buffer and a first automatic regulating valve which are connected in sequence, and the first automatic regulating valve is communicated with a pipeline close to the gas main mixing tank; the inert gas distribution compensation unit comprises an inert gas compressor, an inert gas buffer and a second automatic regulating valve which are sequentially connected, the second automatic regulating valve is also communicated with a pipeline close to the gas main mixing tank, and the first automatic regulating valve and the second automatic regulating valve are respectively and electrically connected with the PLC;
the PLC is suitable for comparing the mixed gas proportion measured by the gas concentration analyzer on the gas premixer in an online sampling manner with a preset mixed gas proportion, and controlling the first electric converter, the second electric converter and the third electric converter in real time so as to adjust the opening degrees of the first pneumatic regulating valve, the second pneumatic regulating valve and the third pneumatic regulating valve;
the upper computer is in communication connection with the PLC, the upper computer comprises a touch display screen and a data memory, the touch display screen is suitable for setting gas distribution parameters including the proportion of the target mixed gas and displaying process data, and the data memory is suitable for storing various gas distribution process data including valve parameters uploaded by the PLC.
2. The mixed gas controllable gas distribution system suitable for the large-scale container according to claim 1, wherein the switch valve assembly further comprises a second electromagnetic switch valve, a gas inlet of the second electromagnetic switch valve is connected with a gas outlet of the inert gas pneumatic three-way regulating valve and an outlet of the first pneumatic regulating valve, and a gas outlet of the second electromagnetic switch valve is connected with the gas premixer.
3. The mixed gas controllable gas distribution system suitable for the large-scale container according to claim 1, wherein a gas evacuation unit is further provided on the gas premixer, and the gas evacuation unit is a pneumatic solenoid valve connected to an evacuation port on the gas premixer.
4. The mixed gas controllable distribution system suitable for the large-scale container according to claim 1, wherein the PLC controller adopts Siemens S7-200 series PLC.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110479123A (en) * | 2019-09-24 | 2019-11-22 | 苏州宏博净化设备有限公司 | Intelligent automatic hydrogen nitrogen matching device |
| CN110726557A (en) * | 2019-10-31 | 2020-01-24 | 北京海德利森科技有限公司 | 1N single-component thruster testing system and method |
| CN113701048A (en) * | 2021-09-01 | 2021-11-26 | 天津市鹏天工贸有限公司 | Gas charging and distributing system for automatically configuring mixed gas with rated proportion for submersible gas cylinder |
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2017
- 2017-10-17 CN CN201721352693.6U patent/CN207667584U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110479123A (en) * | 2019-09-24 | 2019-11-22 | 苏州宏博净化设备有限公司 | Intelligent automatic hydrogen nitrogen matching device |
| CN110726557A (en) * | 2019-10-31 | 2020-01-24 | 北京海德利森科技有限公司 | 1N single-component thruster testing system and method |
| CN113701048A (en) * | 2021-09-01 | 2021-11-26 | 天津市鹏天工贸有限公司 | Gas charging and distributing system for automatically configuring mixed gas with rated proportion for submersible gas cylinder |
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