CN107544422A - A kind of civilian gasification sledge automatic control system of LNG Dewar bottles and control method - Google Patents
A kind of civilian gasification sledge automatic control system of LNG Dewar bottles and control method Download PDFInfo
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- CN107544422A CN107544422A CN201710982887.2A CN201710982887A CN107544422A CN 107544422 A CN107544422 A CN 107544422A CN 201710982887 A CN201710982887 A CN 201710982887A CN 107544422 A CN107544422 A CN 107544422A
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Abstract
The invention discloses a kind of civilian gasification sledge automatic control system of LNG Dewar bottles, it is characterised in that：Including programmable logic controller (PLC)（10）, controlled plant（7）, transmitter（8）, detecting element（9）And power supply；The power supply is respectively that each equipment provides working power；The programmed logic controller（10）Also include programmable logic controller (PLC) expanded mode analog quantity input module（12）With programmable logic controller (PLC) expansion variable output module（11）.The civilian gasification sledge automatic control system of LNG Dewar bottles of the present invention, automaticity is high, and security monitoring is perfect, it is easy to operate, the operating efficiency of operating personnel can be improved, and is protected the safety of equipment and personnel, while realizes the monitoring of LNG in the automatic switchover system and Dewar bottle of air-heating type gasifier.
Description
Technical field
Gasify sledge, the civilian gasification sledge automatic control system of especially a kind of LNG Dewar bottles and control the present invention relates to Dewar bottle
Method processed.
Background technology
The current civilian gasification sledge control system of LNG Dewar bottles is universal more simple, equipment needed when running staff with
When be monitored and operate；It after LNG is used up in Dewar bottle, can not know the very first time, only just know whether needs after inspection
Bottle group is changed, reduces the service efficiency of process equipment；Air-heating type gasifier part is typically without automatic switchover system, it is also necessary to people
Work operating procedure valve, is switched over, and also reduces equipment service efficiency.Monitoring of tools and security monitoring are also more simple simultaneously
Easily, hidden danger has been buried to LNG gasification station safe operation.
The content of the invention
The goal of the invention of the present invention is：For above-mentioned problem, there is provided a kind of civilian gasification sledge of LNG Dewar bottles is certainly
Autocontrol system, the highly integrated control of the civilian gasification station each several part of LNG Dewar bottles, can automatically switch air-heating type gasifier,
It can prompt whether the LNG in Dewar bottle exhausts by indicator lamp, also disclose the civilian gasification sledge side of automatically controlling of LNG Dewar bottles
Method.
The technical solution adopted by the present invention is as follows：
A kind of civilian gasification sledge automatic control system of LNG Dewar bottles of the present invention, including programmable logic controller (PLC), controlled plant,
Transmitter, detecting element and power supply；The power supply is respectively that each equipment provides working power；The programmed logic controller is also
Including programmable logic controller (PLC) expanded mode analog quantity input module and programmable logic controller (PLC) expansion variable output module；
The programmable logic controller (PLC), the signal data arrived for receiving collection in worksite, and according to technological requirement, pass through processing
And calculating, controlled plant is controlled；
The programmable logic controller (PLC) expanded mode analog quantity input module, for receiving 4 ~ 20mA analog signalses；
The programmable logic controller (PLC) expansion variable output module, for output switch amount signal；
The controlled plant, the control instruction sent for performing programmable logic controller (PLC)；
The transmitter, for according to actual pressure temperature equivalence, sending and transmitting 4 ~ 20mA analog signalses and patrolled in programmable
Collect controller expanded mode analog quantity input module；
The detecting element, it is combustible gas probe, for the gas concentration value in region residing for detection device, sends and transmit
4 ~ 20mA analog signalses are in programmable logic controller (PLC) expanded mode analog quantity input module.
Above structure, by detecting element, and the sensor being connected with transmitter, the pressure in collection gasification sledge work
The numerical value such as power, temperature and gas concentration, send 4 ~ 20mA analog signalses and inputted to programmable logic controller (PLC) expanded mode analog quantity
Module, judged in programmable logic controller (PLC), and by programmable logic controller (PLC) expansion variable output module, to
Controlled plant sends control instruction, so as to realize automatically controlling for gasification sledge, each equipment for the sledge that gasifies is concentrated and is controlled,
Avoid due to scattered the problem of can not cooperateing with.
Further, in addition to input element, the input element, pressed for input signal, including SR and jerk
Button；The SR connects relay；The relay, for realizing the control of reset signal, in relay one group it is normally opened
Contact is connected with programmable logic controller (PLC) side input, and another group of normally opened contact is connected with safety relay reset terminal.
Further, the scram button connection safety relay input；The safety relay, for jerk loop,
Safety relay output end is connected with programmable logic controller (PLC) side input.
Above structure, input element send the signal resetted with jerk, scram button and peace to programmable logic controller (PLC)
All relay connects, and safety relay connects with programmable logic controller (PLC), has the normal mould of feedback because emergent stop signal uses
Formula, scram button, which is pressed, can disconnect the output end of safety relay, so as to which controller can not just receive jerk feedback letter
Number, reach the purpose of jerk；The setting of safety relay, the overall security of control system is added, reach the purpose of protection；
SR is connected with relay, passes through relay when SR sends reset signal, at the same be sent to safety relay and
Programmable logic controller (PLC), and after the confirmation of safety relay, realize and reset.
Further, the power supply includes external power source and Switching Power Supply；The external power source, by being carried outside control system
The power supply of confession；The Switching Power Supply, for providing 24V dc sources；The external power source is connected by breaker and Switching Power Supply
Connect；The Switching Power Supply connects programmable logic controller (PLC), temperature control modules, detecting element, transmitter and controlled set respectively
It is standby.
Above structure, because external power source and operating voltage are had differences, it is necessary to Switching Power Supply, there is provided 24V direct current work
Make power supply, so as to provide stable operating voltage.
Further, the breaker is also connected with electrical heating module；The electrical heating module passes through wire and temperature control mould
Block output end is connected；The temperature control modules, it is turned on or off heating for real time temperature in detecting box, and according to arranges value
Loop；The electrical heating module, it is aluminum alloy heating plate, for heating environment temperature.
Above structure, by being detected to environment temperature, and judged, control electrical heating module, so as to adjust automatically
Environment temperature is saved, is avoided too high or too low for temperature.
Further, the controlled plant includes indicator lamp and magnetic valve.
A kind of control method of the civilian gasification sledge automatic control system of LNG Dewar bottles of the present invention, comprises the following steps：
A, system connects external power source, closes breaker, and Switching Power Supply exports dc source after being powered, system equipment, which is powered, to be entered
Mode of operation；
B, temperature control modules are detected by temperature sensor to environment temperature, if environment temperature is less than temperature control modules
The output end conducting of interior set target temperature, then temperature control modules, electrical heating module are powered and begun to warm up, and work as environment
When temperature is heated to target temperature set in temperature control modules, the output end of temperature control modules disconnects, electrical heating
Module from service；Temperature control modules persistently detect to environment temperature during heating；
C, temperature, instrument wind pressure, gas concentration and the and of bottle group one before pressure, pressure regulation after sensor detection device pressure regulation are passed through
Bottle group two is confluxed pressure, judges whether to be in normal condition；
D, the manual emergent stop signal of input is judged, FPGA control is persistently input into when there is manual jerk feedback signal
During device processed, into next execution regulations；If persistently it is input into programmable logic controller (PLC), generation sound without manual jerk feedback signal
Light alarm, while all valves are closed automatically, close normal operation indicator lamp；
E, the gas concentration numerical value gathered to detecting element judges, if the gas concentration numerical value that detecting element is gathered is low
In alarming value, then into next execution regulations；If the gas concentration numerical value that detecting element is gathered is higher than alarming value, generation sound
Light alarm, while all valves are closed automatically, the high alarm lamp of gas concentration is opened, closes normal operation indicator lamp；
F, temperature value before pressure value and pressure regulation is judged after the instrument wind pressure value, pressure regulation that transmitter gathered respectively；If transmitter
The value gathered is less than preset value, then into next execution regulations；If the value that transmitter is gathered is higher than preset value, generation sound
Light alarm, while all valves are closed automatically, opening temperature or pressure anomaly alarm lamp, close normal operation indicator lamp；
G, the bottle group one and bottle group two for judging pressure transmitter collection conflux pressure value whether more than normal value；If pressure
The numerical value that transmitter is gathered is more than normal value, then into next execution regulations；If the numerical value that pressure transmitter is gathered exists
Below normal value, the pressure of bottle group one and the pressure of bottle group two are determined whether respectively；
H, when judging that equipment possesses normal running (operation) conditions, normal operation instruction is opened, automatically opens up related valve；
I, under normal operating conditions, 1#, 2# gasifier inlet valve operation duration are judged；If operation duration is small less than 6
When, then continue normal operation；If operation is more than or equal to 6 hours often, automatic switchover 1#, 2# gasifier inlet valve；
J, for step d, e, f, to system reset after corresponding failure is removed, system is again introduced into step d after reset, holds successively
Row regulations.
Above method, pass through temperature, instrument wind pressure, gas concentration and bottle before pressure, pressure regulation after the pressure regulation to equipment
Group one and bottle group two are confluxed the detection and judgement of pressure, the normal work of control device, are found in time and processing produced problem,
The work of gasification sledge is automatically controlled, while at work, realizes the automatic replacing of gasifier.
Further, to the method for system reset in the step j, including：SR is pressed, while to safety relay
Reset operation is carried out with PLC program.
Above method, the reset for system, SR to be pressed is not only, will also be to safety relay and PLC journeys
Sequence carries out reset operation, by the confirmation of multistep, could recover normal operating condition, it is ensured that failure has been fully solved, and is improved
The security performance of system.
Further, in the step g, when the pressure value that confluxes is less than setting value, respectively to the pressure value of bottle group one and bottle
Two pressure values of group are judged, if bottle group pressure value is less than setting value, close the outlet valve of corresponding bottle group, and open corresponding bottle
The low alarm lamp of bottle group pressure of group, prompts to change bottle group.
Above method, the pressure of bottle group one and bottle group two is detected, so as to find that LNG is used up in Dewar bottle in time,
And prompt to carry out changing bottle, improve service efficiency.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1st, automaticity is high, the highly integrated control of the civilian gasification station each several part of LNG Dewar bottles, accomplished concentrated collection,
Display and control, solve the civilian gasification stand control of current LNG Dewar bottles and disperse, what equipment room can not effectively cooperate asks
Topic.
2nd, automatic switchover air-heating type gasifier, the detection to gasifier inlet valve operation duration, automatic switchover air temperature are passed through
Formula gasifier, is used alternatingly, and improves the service efficiency of equipment.
3rd, the LNG service conditions in automatic detection Dewar bottle, find whether LNG uses up in Dewar bottle in time, and prompt more
A bottle group is changed, improves the service efficiency of process equipment, the situation that LNG is used up in Dewar bottle is just found when avoiding the occurrence of inspection.
4th, device security is high, is configured with safety relay, improves the stability of control system and the security of operation；
Security monitoring is carried out to gasification station each several part simultaneously, and finds and handle safety problem in time, ensures safe operation and work.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is a kind of structural representation of the civilian gasification sledge automatic control system of LNG Dewar bottles of the present invention.
Fig. 2 is a kind of flow chart of the civilian gasification sledge autocontrol method of LNG Dewar bottles of the present invention.
Embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine in any way.
This specification（Including any accessory claim, summary）Disclosed in any feature, unless specifically stated otherwise,
Replaced by other equivalent or with similar purpose alternative features.I.e., unless specifically stated otherwise, each feature is a series of
An example in equivalent or similar characteristics.
Such as Fig. 1, a kind of civilian gasification sledge automatic control system of LNG Dewar bottles of the present invention, including programmable logic controller (PLC)
10th, controlled plant 7, transmitter 8, detecting element 9 and power supply；The power supply is respectively that each equipment provides working power；It is described
Programmed logic controller 10 also includes programmable logic controller (PLC) expanded mode analog quantity input module 12 and programmable logic controller (PLC)
Expansion variable output module 11；Controlled plant 7 and the side output end of programmable logic controller (PLC) 10 and FPGA control
The output end of device expansion variable output module 11 processed is connected, and detecting element 9 is patrolled with programmable respectively with transmitter 8 by wire
The input for collecting controller expanded mode analog quantity input module 12 is connected；
The detecting element 9, it is combustible gas probe, for detection device gas concentration value, sends and transmit 4 ~ 20mA moulds
Analog quantity signal is in programmable logic controller (PLC) expanded mode analog quantity input module 12；The transmitter 8, for according to actual pressure temperature
Degree is equivalent, sends and transmits 4 ~ 20mA analog signalses in programmable logic controller (PLC) expanded mode analog quantity input module 12；It is described
Programmable logic controller (PLC) expanded mode analog quantity input module 12, for receiving 4 ~ 20mA analog signalses；The FPGA
Controller 10, the signal data arrived for receiving collection in worksite, and according to technological requirement, by handling and calculating, set to controlled
Standby 7 indicator lamp and magnetic valve is controlled；The programmable logic controller (PLC) expansion variable output module 11, for exporting
On-off model；The controlled plant 7, the control instruction sent for performing programmable logic controller (PLC) 10.
Also include input element 6, the input element 6, for input signal, including SR and scram button；Institute
State SR connection relay 14；The relay 14, for realizing the control of reset signal, in relay 14 one group it is normally opened
Contact is connected with the side input of programmable logic controller (PLC) 10, another group of normally opened contact and the reset terminal phase of safety relay 13
Even；The scram button connects the input of safety relay 13；The safety relay 13, for jerk loop, safety relay
The output end of device 13 is connected with the side input of programmable logic controller (PLC) 10.When scram button is pressed, safety relay it is defeated
Go out end to disconnect, controller can not receive jerk feedback signal, and programmable logic controller (PLC) 10 closes magnetic valve, realizes jerk；
Pass through relay 14 when SR sends reset signal, while be sent to safety relay 13 and programmable logic controller (PLC)
10, and after the confirmation of safety relay 13, programmable logic controller (PLC) 10 opens magnetic valve, state of resuming work, reaches
Reset.
The power supply includes external power source 1 and Switching Power Supply 3；The external power source 1, by what is provided outside control system
Power supply；The Switching Power Supply 3, for providing 24V dc sources；The external power source 1 is connected by breaker 2 and Switching Power Supply 3
Connect；The Switching Power Supply 3 connects programmable logic controller (PLC) 10, temperature control modules 4, detecting element 9, the and of transmitter 8 respectively
Controlled plant 7.
The breaker 2 is also connected with electrical heating module 5；The electrical heating module 5 is defeated by wire and temperature control modules 4
Go out end to be connected；The temperature control modules 4, for real time temperature in detecting box, and are turned on or off according to arranges value and heat back
Road；The electrical heating module 5, it is aluminum alloy heating plate, for heating environment temperature；Breaker 2 and electrical heating module 5 and temperature
Control module 4 forms loop, on breaker is 2-in-1, while during the output end conducting of temperature control modules 4, has electric current in loop,
Electrical heating module 5 could work.
Such as Fig. 2, a kind of control method of the civilian gasification sledge automatic control system of LNG Dewar bottles of the present invention, including following step
Suddenly：
A, system connects external power source 1, closes breaker 2, and the normal indicator lamp of power supply is all lighted with normal operation indicator lamp, switch
Power supply 3 exports 24V dc sources, programmable logic controller (PLC) 10, the input of programmable logic controller (PLC) expanded mode analog quantity after being powered
Module 12, programmable logic controller (PLC) expansion variable output module 11, temperature control modules 4, safety relay 13, transmitter
8th, controlled plant 7 and the equipment of detecting element 9 obtain working power, into mode of operation；
B, temperature control modules 4 are detected by temperature sensor to environment temperature, if environment temperature is less than temperature control mould
The output end conducting of set target temperature in block 4, then temperature control modules 4, electrical heating module 5 are powered and begun to warm up,
When environment temperature is heated to target temperature set in temperature control modules 4, the output end of temperature control modules 4 is broken
Open, electrical heating module 5 is stopped；Temperature control modules persistently detect to environment temperature during heating；
C, temperature, instrument wind pressure, gas concentration and the and of bottle group one before pressure, pressure regulation after sensor detection device pressure regulation are passed through
Bottle group two is confluxed pressure, judges whether to be in normal condition；
D, the manual emergent stop signal of input is judged, manual emergent stop signal, which uses, the normal pattern of feedback, manual when having
When jerk feedback signal is persistently input into programmable logic controller (PLC) 10, into next execution regulations；If fed back without manual jerk
Signal is persistently input into programmable logic controller (PLC) 10, generates sound and light alarm, while closes all valves automatically, is closing operation just
Normal indicator lamp；
E, the gas concentration numerical value gathered to detecting element 9 judges, if the gas concentration numerical value that detecting element 9 is gathered
Less than alarming value, then into next execution regulations；If the gas concentration numerical value that detecting element 9 is gathered is higher than alarming value, give birth to
Into sound and light alarm, while all valves are closed automatically, open the high alarm lamp of gas concentration, close normal operation indicator lamp；
F, temperature value before pressure value and pressure regulation is judged after the instrument wind pressure value, pressure regulation that transmitter 8 gathered respectively；If transmitter
8 values gathered are less than preset value, then into next execution regulations；If the value that transmitter 8 is gathered is higher than preset value, generate
Sound and light alarm, while all valves are closed automatically, opening temperature or pressure anomaly alarm lamp, close normal operation instruction
Lamp；
G, the bottle group one and bottle group two for judging the collection of pressure transmitter 8 conflux pressure value whether more than normal value；If pressure
The numerical value that transmitter 8 is gathered is more than normal value, then into next execution regulations；If the numerical value that pressure transmitter 8 is gathered
Below normal value, the pressure of bottle group one and the pressure of bottle group two are determined whether respectively；If bottle group pressure value is less than setting value, close
The outlet valve of corresponding bottle group is closed, and opens the low alarm lamp of bottle group pressure of corresponding bottle group, prompts to change bottle group；
H, when judging that equipment possesses normal running (operation) conditions, normal operation instruction is opened, automatically opens up related valve；
I, under normal operating conditions, 1#, 2# gasifier inlet valve operation duration are judged；If operation duration is small less than 6
When, then continue normal operation；If operation is more than or equal to 6 hours often, automatic switchover 1#, 2# gasifier inlet valve；
J, for step d, e, f, after corresponding failure is removed, SR is pressed, while safety relay and PLC program are entered
Row resets operation, and to system reset, system is again introduced into step d after reset, performs regulations successively.
The invention is not limited in foregoing embodiment.The present invention, which expands to, any in this manual to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (9)
- A kind of 1. civilian gasification sledge automatic control system of LNG Dewar bottles, it is characterised in that：Including programmable logic controller (PLC) （10）, controlled plant（7）, transmitter（8）, detecting element（9）And power supply；The power supply is respectively that each equipment provides work electricity Source；The programmed logic controller（10）Also include programmable logic controller (PLC) expanded mode analog quantity input module（12）With it is programmable Logic controller expansion variable output module（11）；The programmable logic controller (PLC)（10）, the signal data that is arrived for receiving collection in worksite, and according to technological requirement, pass through Processing and calculating, to controlled plant（7）It is controlled；The programmable logic controller (PLC) expanded mode analog quantity input module（12）, for receiving 4 ~ 20mA analog signalses；The programmable logic controller (PLC) expansion variable output module（11）, for output switch amount signal；The controlled plant（7）, for performing programmable logic controller (PLC)（10）The control instruction sent；The transmitter（8）, for according to actual pressure temperature equivalence, sending and transmitting 4 ~ 20mA analog signalses in programmable Logic controller expanded mode analog quantity input module（12）；The detecting element（9）, for the gas concentration value in region residing for detection device, send and transmit 4 ~ 20mA analog quantitys letter Number in programmable logic controller (PLC) expanded mode analog quantity input module（12）.
- 2. the civilian gasification sledge automatic control system of LNG Dewar bottles according to claim 1, it is characterised in that：Also include input element（6）, the input element（6）, for input signal, including SR and scram button；Institute State SR connection relay（14）；The relay（14）, for realizing the control of reset signal, relay（14）In one Group normally opened contact and programmable logic controller (PLC)（10）Side input is connected, another group of normally opened contact and safety relay（13） Reset terminal is connected.
- 3. the civilian gasification sledge automatic control system of LNG Dewar bottles according to claim 2, it is characterised in that：The jerk Button connects safety relay（13）Input；The safety relay（13）, for jerk loop, safety relay（13）It is defeated Go out end and programmable logic controller (PLC)（10）Side input is connected.
- 4. the civilian gasification sledge automatic control system of LNG Dewar bottles according to claim 1, it is characterised in that：The power supply Including external power source（1）And Switching Power Supply（3）；The external power source（1）, by the power supply provided outside control system；It is described Switching Power Supply（3）, for providing 24V dc sources；The external power source（1）Pass through breaker（2）With Switching Power Supply（3）Even Connect；The Switching Power Supply（3）Programmable logic controller (PLC) is connected respectively（10）, temperature control modules（4）, detecting element（9）, become Send device（8）And controlled plant（7）.
- 5. the civilian gasification sledge automatic control system of LNG Dewar bottles according to claim 4, it is characterised in that：The open circuit Device（2）It is also connected with electrical heating module（5）；The electrical heating module（5）Pass through wire and temperature control modules（4）Output end phase Even；The temperature control modules（4）, it is turned on or off heating circuit for real time temperature in detecting box, and according to arranges value；Institute State electrical heating module（5）, it is aluminum alloy heating plate, for heating environment temperature.
- 6. the civilian gasification sledge automatic control system of LNG Dewar bottles according to claim 1, it is characterised in that：It is described controlled Equipment（7）Including indicator lamp and magnetic valve.
- A kind of 7. control method of the civilian gasification sledge automatic control system of LNG Dewar bottles, it is characterised in that：Comprise the following steps：A, system connects external power source（1）, close breaker（2）, Switching Power Supply（3）Dc source is exported after energization, system is set Standby be powered enters mode of operation；B, temperature control modules（4）Environment temperature is detected by the temperature sensor carried, if environment temperature is less than temperature Spend control module（4）Interior set target temperature, then temperature control modules（4）Output end conducting, electrical heating module（5）It is logical Electricity is simultaneously begun to warm up, when environment temperature is heated to temperature control modules（4）During interior set target temperature, temperature control mould Block（4）Output end disconnect, electrical heating module（5）It is stopped；Temperature control modules are persistently to environment temperature during heating Detected；C, temperature, instrument wind pressure, gas concentration and the and of bottle group one before pressure, pressure regulation after sensor detection device pressure regulation are passed through The pressure of confluxing of bottle group two, judges whether to be in normal condition；D, the manual emergent stop signal of input is judged, FPGA control is persistently input into when there is manual jerk feedback signal Device processed（10）When, into next execution regulations；If persistently it is input into programmable logic controller (PLC) without manual jerk feedback signal （10）, sound and light alarm is generated, while all valves are closed automatically, close normal operation indicator lamp；E, to detecting element（9）The gas concentration numerical value gathered is judged, if detecting element（9）The gas concentration gathered Numerical value is less than alarming value, then into next execution regulations；If detecting element（9）The gas concentration numerical value gathered is higher than alarm Value, then generate sound and light alarm, while closes all valves automatically, opens the high alarm lamp of gas concentration, closes normal operation Indicator lamp；F, transmitter is judged respectively（8）Temperature value before pressure value and pressure regulation after the instrument wind pressure value that is gathered, pressure regulation；If pick-up Device（8）The value gathered is less than preset value, then into next execution regulations；If transmitter（8）The value gathered is higher than preset value, Sound and light alarm is then generated, while closes all valves automatically, opening temperature or pressure anomaly alarm lamp, closes normal operation Indicator lamp；G, pressure transmitter is judged（8）The bottle group one and bottle group two of collection conflux pressure value whether more than normal value；If pressure Power transmitter（8）The numerical value gathered is more than normal value, then into next execution regulations；If pressure transmitter（8）Gathered Numerical value below normal value, the pressure of bottle group one and the pressure of bottle group two are determined whether respectively；H, when judging that equipment possesses normal running (operation) conditions, normal operation instruction is opened, automatically opens up related valve；I, under normal operating conditions, 1#, 2# gasifier inlet valve operation duration are judged；If operation duration is small less than 6 When, then continue normal operation；If operation is more than or equal to 6 hours often, automatic switchover 1#, 2# gasifier inlet valve；J, for step d, e, f, to system reset after corresponding failure is removed, system is again introduced into step d after reset, holds successively Row regulations.
- 8. the control method of the civilian gasification sledge automatic control system of LNG Dewar bottles according to claim 7, its feature exist In：To the method for system reset in the step j, including：SR is pressed, while safety relay and PLC program are entered Row resets operation.
- 9. the control method of the civilian gasification sledge automatic control system of LNG Dewar bottles according to claim 7, its feature exist In：In the step g, when the pressure value that confluxes is less than setting value, the pressure value of bottle group one and the pressure value of bottle group two are sentenced It is disconnected, if bottle group pressure value is less than setting value, the outlet valve of corresponding bottle group is closed, and open the low report of bottle group pressure of corresponding bottle group Alert indicator lamp, prompts to change bottle group.
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