CN202349596U - Automatically-controlled supply system for liquefied gas - Google Patents
Automatically-controlled supply system for liquefied gas Download PDFInfo
- Publication number
- CN202349596U CN202349596U CN2011205224829U CN201120522482U CN202349596U CN 202349596 U CN202349596 U CN 202349596U CN 2011205224829 U CN2011205224829 U CN 2011205224829U CN 201120522482 U CN201120522482 U CN 201120522482U CN 202349596 U CN202349596 U CN 202349596U
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- CN
- China
- Prior art keywords
- cryogenic liquid
- pressure
- low
- air
- liquid pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000007788 liquid Substances 0.000 claims abstract description 80
- 238000010438 heat treatment Methods 0.000 claims description 18
- 230000003139 buffering effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 6
- 230000006837 decompression Effects 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model provides an automatically-controlled supply system for a liquefied gas. The system comprises a first low-temperature liquid storage groove, a low-temperature liquid pump, a second low-temperature liquid storage groove, an air-temperature gasifier and a pressure regulation system. The first low-temperature liquid storage groove is connected with the low-temperature liquid pump, the low-temperature liquid pump is connected with the second low-temperature liquid storage groove, the second low-temperature liquid storage groove is connected with the air-temperature gasifier, and the air-temperature gasifier is connected with the pressure regulation system. The second low-temperature liquid storage groove is provided with a pressure transmitter, the pressure transmitter and the low-temperature liquid pump are connected with a PLC (programmable logic controller) electrical cabinet, and the PLC electrical cabinet is provided with a frequency converter. The automatically-controlled supply system for the liquefied gas provided by the utility model is stable in pressure, safe and reliable, and can be used for reducing the floor area and the manual labour intensity by using liquid buffering.
Description
Technical field
The utility model relates to a kind of automation control system, particularly a kind of liquid gas supply system of automation control.
Background technique
At present, in the liquid gas supply,, generally after cryogenic liquid tank, add a cryogenic liquid pump (VFC or speed regulating control) if the terminal is higher than the cryogenic liquid tank working pressure with atmospheric pressure.With the cryogenic liquide in the cryogenic liquid tank, after the pressure that is mainly oxygen, nitrogen, argon raises, get into air-heating type gasifier, become gas after the cryogenic liquide heat absorption, get into gas buffer jar buffering, after the voltage-regulating system pressure regulation, supply with gas equipment then and use.Shown in accompanying drawing 1.
1), equipment gas consumption fluctuation the major defect of this system is:, cause the pressure surge of cryogenic liquid pump back, possibly surpass the working pressure of air-heating type gasifier, gas buffer jar, voltage-regulating system.In order to guarantee not superpressure, just need through the frequency of the artificial adjustment of adjustment in good time cryogenic liquid pump frequency-variable controller or the speed stage of speed-regulating controller.This system guarantees pressure at zone of reasonableness by manual control, causes hypotony probably, and is too high, even owing to people's carelessness sets off an explosion.In addition: the volume of gas buffer jar is bigger, and floor space is big.
Summary of the invention
For solving the problems of the technologies described above, the utility model provides a kind of liquid gas supply system of automation control, and pressure stability is safe and reliable, adopts fluid cushion to reduce floor space, reduces hand labor intensity.
The above-mentioned purpose of the utility model is to realize through such technological scheme: a kind of liquid gas supply system of automation control comprises first cryogenic liquid tank, cryogenic liquid pump, second cryogenic liquid tank, air-heating type gasifier, voltage-regulating system.First cryogenic liquid tank connects cryogenic liquid pump, and cryogenic liquid pump connects second cryogenic liquid tank, and second cryogenic liquid tank connects air-heating type gasifier, and air-heating type gasifier connects voltage-regulating system.Said second cryogenic liquid tank is equipped with pressure transmitter, and said pressure transmitter, cryogenic liquid pump connect the PLC electric control cubicle, and said PLC electric control cubicle is provided with frequency variator.
On the output pipeline of said air-heating type gasifier pressure gauge with electric contact is installed, pressure gauge with electric contact connects electric bell and inverter output terminal power supply.
On the output pipeline of said air-heating type gasifier pressure gauge with electric contact is installed; Pressure gauge with electric contact connects electric bell and control inverter output terminal power supply, when pressure transmitter, PLC and circuit thereof break down, or the pressure range do not set of pressure; The action of pressure gauge with electric contact control electric bell is reported to the police; If pressure is higher than setting value, pressure gauge with electric contact control inverter output terminal power cut-off, cryogenic liquid pump quits work; Get back to setting range like pressure, the energising of pressure gauge with electric contact control inverter output terminal power supply.
Control the operation of cryogenic liquid pump and stop formation double protection, the generation of effectively stopping security incident through automatic control mode control and mechanical type.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Fig. 1 is a liquid gas supply system structural drawing in the background technique;
Wherein: a, cryogenic liquid tank, b, cryogenic liquid pump, c, air-heating type gasifier, d, gas buffer jar, e, voltage-regulating system.
Fig. 2 is the utility model liquid gas supply system structural drawing.
Fig. 3 is the utility model voltage-regulating system structural drawing.
Fig. 4 is the utility model electrical control figure.
Embodiment
As shown in Figure 2, a kind of liquid gas supply system of automation control comprises first cryogenic liquid tank 1, cryogenic liquid pump 2, the second cryogenic liquid tanks 3, air-heating type gasifier 4, voltage-regulating system 5.First cryogenic liquid tank 1 connects cryogenic liquid pump 2, and cryogenic liquid pump 2 connects second cryogenic liquid tank, 3, the second cryogenic liquid tanks 3 and connects air-heating type gasifier 4, and air-heating type gasifier 4 connects voltage-regulating system 5.Said second cryogenic liquid tank 3 is equipped with pressure transmitter 7; Said pressure transmitter 7, cryogenic liquid pump 2 connect PLC electric control cubicle 6; Said PLC electric control cubicle 6 is provided with frequency variator; Pressure gauge with electric contact 8 is installed on the output pipeline of said air-heating type gasifier 4, and pressure gauge with electric contact 8 connects the power supply of electric bell 9 and PLC electric control cubicle 6.
A kind of liquid gas Supply Method of automation control, step is following:
1), the related valve of first cryogenic liquid tank 1, cryogenic liquid pump 2, second cryogenic liquid tank 3 opens, and lets cryogenic liquid pump 2 abundant precoolings, approximately 5-10 minute, the muffler atmospheric valve of cryogenic liquid pump 2 had liquid to come out to explain that precooling is very abundant.
2), open the general power of PLC electric control cubicle 6 and the enable switch of frequency variator.
3), cryogenic liquid pump 2 starts working, and cryogenic liquide is transported to second cryogenic liquid tank 3.
4), the pressure in pressure transmitter 7 measurements second cryogenic liquid tank 3; And send numerical value to PLC; Send instruction to frequency variator after the process analysis among the PLC; The frequency shift of frequency variator, thus cryogenic liquid pump 2 variable-frequency motor rotating speeds change, and control in second cryogenic liquid tank 3 constant pressure at setting range.
5), the cryogenic liquide in second cryogenic liquid tank 3 gets into air-heating type gasifier 4, the cryogenic liquide heat absorption becomes gas, through voltage-regulating system 5 pressure regulation, supplies gas equipment to use.
Pressure gauge with electric contact 8 is installed on the output pipeline of said air-heating type gasifier 4; Pressure gauge with electric contact 8 connects electric bell 9 and control inverter output terminal power supply; When pressure transmitter 7, PLC and circuit thereof break down; Or pressure is not in the pressure range of setting, wherein: the scope that the pressure range that PLC sets is set than pressure gauge with electric contact is little.9 actions of pressure gauge with electric contact 8 control electric bells are reported to the police.Pressure height and pressure hang down different ring tones are arranged, and adopt respectively: electric bell 9-1, electric bell 9-2.If pressure is higher than setting value, pressure gauge with electric contact 8 control inverter output terminal power cut-offs, cryogenic liquid pump 2 quits work.
Operation through automatic control mode control cryogenic liquid pump 2 and stopping, if pressure transmitter 7, PLC and circuit thereof break down, then through mechanical type control cryogenic liquid pump 2 stop to report to the police simultaneously, reach the purpose of duplicate protection.
Voltage-regulating system 5 is made up of various valves, and is as shown in Figure 3:
Safety valve 5-1, pressure before the control decompression; Pressure gauge 5-2: pressure before the decompression; Pressure meter valve 5-3; Valve 5-4: stop valve or ball valve; Reduction valve 5-5: reduce pressure; Valve 5-6: stop valve or ball valve; Valve 5-7: stop valve or ball valve, bypass is used; Valve 5-8: stop valve or ball valve; Reduction valve 9: reduce pressure; Valve 5-10: stop valve or ball valve; Valve 5-11: pressure meter valve; Pressure gauge 5-12: decompression back pressure; Safety valve 5-13: control decompression back pressure; Valve 5-14: stop valve or ball valve, emptying is used.
The utility model control procedure is as shown in Figure 4, when pressure reduces, and pressure gauge with electric contact 8 throw of pointer, electric bell 9-1 connects; When pressure raises, pressure gauge with electric contact 8 throw of pointer, electric bell 9-2 connects; The coil electricity of contactor KM2, normally-closed contact breaks off, the output terminal outage of frequency variator 10; The variable-frequency motor M of cryogenic liquid pump 2 is out of service, thereby reaches the purpose that mechanical type stops cryogenic liquid pump 2 operations; When pressure is got back to the scope of setting, pressure gauge with electric contact 8 throw of pointer, electric bell 9-1,9-2 outage, the coil blackout of contactor KM2, normally-closed contact is closed, the output terminal energising of frequency variator 10.
Simultaneously through 2 operations of PLC procedure auto-control cryogenic liquid pump.Pressure transmitter 7 is passed to PLC with the pressure signal that collects, and PLC output control frequency variator is through changing the rotating speed of FREQUENCY CONTROL variable-frequency motor M.
Claims (2)
1. the liquid gas supply system of an automation control comprises first cryogenic liquid tank (1), cryogenic liquid pump (2), second cryogenic liquid tank (3), air-heating type gasifier (4), voltage-regulating system (5);
First cryogenic liquid tank (1) connects cryogenic liquid pump (2); Cryogenic liquid pump (2) connects second cryogenic liquid tank (3); Second cryogenic liquid tank (3) connects air-heating type gasifier (4), and air-heating type gasifier (4) connects voltage-regulating system (5);
It is characterized in that: said second cryogenic liquid tank (3) is equipped with pressure transmitter (7), and said pressure transmitter (7), cryogenic liquid pump (2) connect PLC electric control cubicle (6), and said PLC electric control cubicle (6) is provided with frequency variator.
2. the liquid gas supply system that said a kind of automation is controlled according to claim 1; It is characterized in that: pressure gauge with electric contact (8) is installed on the output pipeline of said air-heating type gasifier (4), and pressure gauge with electric contact (8) connects electric bell (9) and inverter output terminal power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205224829U CN202349596U (en) | 2011-12-14 | 2011-12-14 | Automatically-controlled supply system for liquefied gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205224829U CN202349596U (en) | 2011-12-14 | 2011-12-14 | Automatically-controlled supply system for liquefied gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202349596U true CN202349596U (en) | 2012-07-25 |
Family
ID=46538603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205224829U Expired - Lifetime CN202349596U (en) | 2011-12-14 | 2011-12-14 | Automatically-controlled supply system for liquefied gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202349596U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434782A (en) * | 2011-12-14 | 2012-05-02 | 湖北和远气体有限公司 | Liquefied gas supply system based on automated control |
| CN108266641A (en) * | 2018-01-16 | 2018-07-10 | 中科睿凌江苏低温设备有限公司 | A kind of liquid gas supply system of automation control |
-
2011
- 2011-12-14 CN CN2011205224829U patent/CN202349596U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434782A (en) * | 2011-12-14 | 2012-05-02 | 湖北和远气体有限公司 | Liquefied gas supply system based on automated control |
| CN108266641A (en) * | 2018-01-16 | 2018-07-10 | 中科睿凌江苏低温设备有限公司 | A kind of liquid gas supply system of automation control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Seven Mile Bay, dragon boat town, Changyang Tujia Autonomous County, Hubei, Yichang 443500, China Patentee after: Hubei Heyuan Gases Co., Ltd. Address before: Seven Mile Bay, dragon boat town, Changyang Tujia Autonomous County, Hubei, Yichang 443500, China Patentee before: Hubei Heyuan Gas Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20120725 |
|
| CX01 | Expiry of patent term |