CN208735264U - A kind of L-CNG loading system - Google Patents
A kind of L-CNG loading system Download PDFInfo
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- CN208735264U CN208735264U CN201820989109.6U CN201820989109U CN208735264U CN 208735264 U CN208735264 U CN 208735264U CN 201820989109 U CN201820989109 U CN 201820989109U CN 208735264 U CN208735264 U CN 208735264U
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Abstract
The utility model discloses a kind of L-CNG loading systems, including unloading unit, LNG storage tank, storage tank booster, plunger pump sledge, high pressure gasifier sledge, sequential control disk, caisson, CNG dispenser, instrument wind system, PLC station control system and flammable gas alarm, unloading unit, LNG storage tank, plunger pump sledge, high pressure gasifier sledge, sequential control disk, caisson and CNG dispenser are sequentially connected, storage tank booster is connected in LNG storage tank, flammable gas alarm is used to detect plunger pump sledge and whether high pressure gasifier sledge occurs natural gas leaking, on plunger pump sledge two plunger pumps in parallel on high pressure gasifier sledge between two high pressure gasifiers in parallel by the Push And Releases of 3 high-pressure stop valves, any one plunger pump can be achieved and correspond to any one high pressure gasifier.The utility model has the advantages that it is more convenient to operate other than the function of meeting existing L-CNG filling station, control more comprehensively, better meets maintenance and use demand.
Description
Technical field
The utility model relates to field natural gas filling stations, and in particular to a kind of L-CNG loading system.
Background technique
Compressed natural gas (Compressed Natuial Gas, usually indicated with CNG), as a kind of green cleaning energy
Source is one of substitute of traditional fuel.Compressed natural gas can be obtained by natural gas compressing, can also be pressurizeed by LNG
Gasification obtains.
As the price of natural gas storage gas and increment gas merges, the procurement price of CNG gas station is up to historical high
Position, and it is gradually market-oriented along with the further release and LNG spot trade of domestic LNG liquefaction plant production capacity, and LNG arrives at a station
Price further drops.In this context, especially in part, LNG price has the region of certain competitive advantage, and LNG is converted into CNG
Gas station will be expected to be rapidly developed.
Urgently a kind of L-CNG loading system thus, other than the function of meeting existing L-CNG filling station, it is more convenient to operate,
Control more comprehensively, better meets maintenance and use demand.
Utility model content
The purpose of this utility model overcomes the deficiencies of the prior art and provide a kind of L-CNG loading system, is meeting existing L-
Other than the function of CNG filling station, it is more convenient to operate, and control more comprehensively, better meets maintenance and use demand.
The purpose of this utility model is reached by following technical measures: a kind of L-CNG loading system, including dress of unloading
It sets, LNG storage tank, storage tank booster, plunger pump sledge, high pressure gasifier sledge, sequential control disk, caisson, CNG dispenser, instrument
Table wind system, PLC station control system and flammable gas alarm, the unloading unit, LNG storage tank, plunger pump sledge, high pressure gasifier
Sledge, sequential control disk, caisson, CNG dispenser are sequentially connected by gas pipeline, and storage tank booster passes through natural gas tube
Road is connected in LNG storage tank, and sequential control disk guarantees caisson switching inflation the pressure of caisson, instrument wind system
The Push And Release united for automatically controlling the operated pneumatic valve in entire L-CNG loading system, PLC stand control system for automation control
L-CNG fills process, and flammable gas alarm includes combustible gas probe and gas alarm, combustible gas probe
It is respectively provided on plunger pump sledge and high pressure gasifier sledge, for detecting whether natural gas leaking occurs, gas alarm is set
In control room, when natural gas leaking occurs, combustible gas probe and gas alarm are simultaneously emitted by alarm, plunger
There are two plunger pumps in parallel, respectively the first plunger pump 1 and the second plunger pump 2, two plunger pump one work one on pump sledge
Platform is spare, or in order to meet the needs of peak time aerating, two use simultaneously, have on high pressure gasifier sledge two it is in parallel
High pressure gasifier, respectively the first high pressure gasifier 3 and the second high pressure gasifier 4, two high pressure gasifier one works one
It is spare, it is equipped with 3 high-pressure stop valves between two plunger pumps in parallel high pressure gasifier in parallel with two, passes through control 3
The switch of high-pressure stop valve is, it can be achieved that any one plunger pump corresponds to any one high pressure gasifier.
Further, plunger pump sledge is connected with first pressure transmitter 5 from conveying entrance, defeated in first pressure transmitter 5
Outlet is connected with pipeline in parallel twice, wherein a pipeline is by the first quick action emergency valve 6, the first strainer valve 8, the first plunger pump
1, second pressure transmitter 10 and first check-valve 12 are successively linked in sequence along defeated air supply direction, are equipped on the first plunger pump 1
First temperature transmitter 14, another time pipeline is by the second quick action emergency valve 7, the second strainer valve 9, the second plunger pump 2, third pressure
Transmitter 11 and second check-valve 13 are successively linked in sequence along defeated air supply direction, and second temperature is equipped on the second plunger pump 2 and is become
Send device 15.
Further, high pressure gasifier sledge is connected with the first high pressure gasifier 3, the first high-pressure ball valve in turn from conveying entrance
21, the 4th pressure transmitter 23, third high-pressure ball valve 24 and third temperature transmitter 28, the input end of water-bath type heater 27
It is connected with the 4th high-pressure ball valve 25, the outlet end of water-bath type heater 27 is connected with the 5th high-pressure ball valve 26, the 4th high-pressure ball valve
25 input terminal is connected to the input terminal of third high-pressure ball valve 24, and the output end of the 5th high-pressure ball valve 26 is connected to third smash
The output end of valve 24, the second high pressure gasifier 4 and the second high-pressure ball valve 22 along defeated air supply direction be sequentially connected after access the 4th pressure
The input terminal of power transmitter 23.
Further, the first plunger pump 1, the second plunger pump 2, the first high pressure gasifier 3 and the second high pressure gasifier 4 are respective
Export pipeline on all have additional release pipeline, diffuse the gas in pipeline after safety valve pressure release, be collected to high pressure EAG gasification
It is diffused after being heated in device 29.
Further, it is connected with third quick action emergency valve 16 on the release pipeline of 1 output end of the first plunger pump, third is tight
For guaranteeing the first plunger pump 1, bringing onto load does not carry out opening machine anxious stop valve 16, on the release pipeline of 2 output end of the second plunger pump
It is connected with the 4th quick action emergency valve 17, bringing onto load does not carry out opening machine the 4th quick action emergency valve 17 for guaranteeing the second plunger pump 2.
Further, the return line of plunger pump sled is equipped with temperature transmitter.
Further, the return line of plunger pump sled is equipped with shut-off valve.
Further, blowdown line in parallel twice is had additional on the muffler of plunger pump sled, is divided on blowdown line
Not She You stop valve, stop valve output end is equipped with safety valve wherein, another stop valve output end and safety valve export
End merges output, it is ensured that can be discharged rapidly after superpressure.
Compared with prior art, the utility model has the beneficial effects that
1. the plunger pump and high pressure gasifier in this L-CNG loading system are all set as 2, a job one is spare,
And it is realized any one between 2 plunger pumps in parallel and 2 high pressure gasifiers in parallel by 3 high-pressure stop valve controls
Platform plunger pump corresponds to any one high pressure gasifier, has better met the demand for using and repairing.
2. being realized by the multiple temperature transmitters and pressure transmitter that are arranged to pipeline in this L-CNG loading system
The monitoring of middle temperature and pressure will call the police shutdown when the preset value is exceeded.
3. diffusing the quick action emergency valve being arranged on pipeline after plunger pump, guaranteeing plunger pump, bringing onto load does not carry out opening machine.
4. by the plunger pump sled of optimization design and high pressure gasifier sled in this L-CNG loading system, so that operation is more
Convenient, control more comprehensively, better meets maintenance and use demand.
It elaborates with reference to the accompanying drawings and detailed description to the utility model.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of L-CNG loading system.
Fig. 2 is the structural schematic diagram of plunger pump sled and high pressure gasifier sled connection.
Specific embodiment
As shown in Fig. 1 to 2, a kind of L-CNG loading system, including unloading unit, LNG storage tank, storage tank booster, plunger pump
Sledge, high pressure gasifier sledge, sequential control disk, caisson, CNG dispenser, instrument wind system, PLC station control system and combustible gas
Body alarm, the unloading unit, LNG storage tank, plunger pump sledge, high pressure gasifier sledge, sequential control disk, caisson, CNG
Dispenser is sequentially connected by gas pipeline, and storage tank booster is connected in LNG storage tank by gas pipeline, sequential control
Disk guarantees caisson switching inflation the pressure of caisson, and instrument wind system adds for automatically controlling entire L-CNG
The Push And Release of operated pneumatic valve in injection system, PLC stand control system for automation control L-CNG filling process, fuel gas report
Alert device includes combustible gas probe and gas alarm, and combustible gas probe is respectively provided at plunger pump sledge and high pressure gas
Change on device sledge, be combustible gas probe 34 and combustible gas probe 35 respectively for detecting whether natural gas leaking occurs,
Gas alarm is located in control room, when natural gas leaking occurs, combustible gas probe and gas alarm
It is simultaneously emitted by alarm, there is two plunger pumps in parallel, respectively the first plunger pump 1 and the second plunger pump 2 on plunger pump sledge, two
Plunger pump one work one is spare, works as peak time, and the two can also work at the same time, and accelerates the aeration speed of peak time,
There are two high pressure gasifiers in parallel, respectively the first high pressure gasifier 3 and the second high pressure gasifier 4 on high pressure gasifier sledge,
Two high pressure gasifier one work one are spare, are equipped between two plunger pumps in parallel high pressure gasifier in parallel with two
3 high-pressure stop valves, by controlling the switch of 3 high-pressure stop valves, it can be achieved that any one plunger pump corresponds to any one height
Press gasifier.
Plunger pump sledge is connected with first pressure transmitter 5 from conveying entrance, connects in the output end of first pressure transmitter 5
There is pipeline in parallel twice, wherein a pipeline is pressed by the first quick action emergency valve 6, the first strainer valve 8, the first plunger pump 1, second
Power transmitter 10 and first check-valve 12 are successively linked in sequence along defeated air supply direction, and the first temperature is equipped on the first plunger pump 1
Transmitter 14, another time pipeline is by the second quick action emergency valve 7, the second strainer valve 9, the second plunger pump 2, third pressure transmitter 11
It is successively linked in sequence along defeated air supply direction with second check-valve 13, second temperature transmitter 15 is equipped on the second plunger pump 2.It is logical
Crossing first pressure transmitter 5 can be monitored in real time pressure before pump, when the first plunger pump 1 or 2 inlet pressure of the second plunger pump are lower than
0.3MPa can alarm.The pre-cooling of the first plunger pump 1 and feed liquor can be remotely controlled by the first quick action emergency valve 6.Pass through
First strainer valve 8 can be with the impurity in filter pipe, it is ensured that into the LNG free from admixture of the first plunger pump 1, guarantees the first plunger pump
1 operates normally.The first temperature transmitter 14 is arranged in first plunger pump 1, carries out alarm shutdown when temperature is more than 65 DEG C.First column
Pressure after pump can be monitored in real time in plug pump 1 output end setting second pressure transmitter 10, can be into when outlet pressure is higher than 25MPa
Row alarm is shut down.First plunger pump, 1 output end is additionally provided with first check-valve 12, it is ensured that medium will not be flow backwards, and protect the first column
Plug pump 1.Second quick action emergency valve 7, the second strainer valve 9, the second plunger pump 2, second temperature transmitter 15, third pressure transmitter
11 and second check-valve 13 effect respectively be same as above review state in the first quick action emergency valve 6, the first strainer valve 8, the first plunger pump
1, the first temperature transmitter 14, second pressure transmitter 10 and first check-valve 12, are not repeated explanation herein.
High pressure gasifier sledge is connected with the first high pressure gasifier 3, the first high-pressure ball valve the 21, the 4th pressure in turn from conveying entrance
Power transmitter 23, third high-pressure ball valve 24 and third temperature transmitter 28, the input end of water-bath type heater 27 are connected with the 4th
High-pressure ball valve 25, the outlet end of water-bath type heater 27 are connected with the 5th high-pressure ball valve 26, the input terminal of the 4th high-pressure ball valve 25
It is connected to the input terminal of third high-pressure ball valve 24, the output end of the 5th high-pressure ball valve 26 is connected to the defeated of third high-pressure ball valve 24
Outlet, the second high pressure gasifier 4 and the second high-pressure ball valve 22 along defeated air supply direction be sequentially connected after access the 4th pressure transmitter
23 input terminal.When the first high pressure gasifier 3 when not in use, the first high-pressure ball valve 21 is closed.4th pressure transmitter 23 can
Pressure after being gasified with real-time monitoring, and it is chain with the first plunger pump 1 or the second plunger pump 2, it will call the police shutdown higher than 25MPa.The
Temperature after gasification can be monitored in real time in three temperature transmitters 28, and chain with the first plunger pump 1 or the second plunger pump 2, is lower than 5 DEG C
It will call the police shutdown.Water-bath type heater 27 will start carry out re-heat lower than 7 DEG C when CNG temperature.Water-bath type heater inlet and outlet are set
The 4th high-pressure ball valve 25 and the 5th high-pressure ball valve 26 are set, and bypass third high-pressure ball valve 24 is set, when water bath type gasifier needs
Maintenance, the 4th high-pressure ball valve 25 and the 5th high-pressure ball valve 26 are closed, and bypass third high-pressure ball valve 24 is opened.
First plunger pump 1, the second plunger pump 2, the first high pressure gasifier 3 and the respective efferent duct of the second high pressure gasifier 4
Release pipeline is all had additional on line, is diffused the gas in pipeline after safety valve pressure release, is collected in high pressure EAG gasifier 29 and adds
It is diffused after heat.Gas temperature after ensuring to diffuse is higher than -107 DEG C, can float up to high-altitude rapidly.
It is connected with third quick action emergency valve 16 on the release pipeline of first plunger pump, 1 output end, when the first plunger pump 1 opens machine
Before can open 5s and carry out pressure release, 5s can be opened before the first plunger pump 1 is shut down and carries out pressure release, guarantees the first plunger pump 1 without negative
It is loaded into row and opens machine, the 4th quick action emergency valve 17, the 4th emergency cut-off are connected on the release pipeline of 2 output end of the second plunger pump
For guaranteeing the second plunger pump 2, bringing onto load does not carry out opening machine valve 17.
The return line of plunger pump sled is equipped with temperature transmitter, suction temperature can be monitored in real time, when detecting return-air
Temperature is lower than -120 DEG C, indicates that pre- cold flow is completed, certain interval of time (such as 5min) plunger pump can open machine.With the first column
Temperature transmitter 30 is provided that in plug 1 corresponding return line of pump, is arranged in return line corresponding with the second plunger pump 2
Be temperature transmitter 31.
The return line of plunger pump sled is equipped with shut-off valve, and shut-off valve is in normally open position, when certain plunger pump long-time
When not in use, shut-off valve need to be turned off manually.Shut-off valve is provided that in return line corresponding with the first plunger pump 1
32, shut-off valve 33 is provided that in return line corresponding with the second plunger pump 2.
Blowdown line in parallel twice is had additional on the muffler of plunger pump sled, and cutting is respectively equipped on blowdown line
Valve, a stop valve output end is equipped with safety valve wherein, another stop valve output end merges output with safety valve output end,
It can be discharged rapidly after ensuring superpressure.
It unloads process: LNG tank car-unloading unit-LNG storage tank
Tank car inner part LNG is returned at the top of LNG tank car by endothermic gasification after the booster of unloading in unloading unit, by
Step increases the gaseous pressure of tank car.When LNG slot interior pressure is higher than 0.3 MPa or more of pressure of storage tank, using pressure difference by tank car
Interior LNG is injected into LNG storage tank, since LNG is gradually reduced in tank car during unloading, needs constantly to be pressurized to tank car to keep
Pressure difference pressure (0.3MPa).
CNG fills process: LNG storage tank-plunger pump-high pressure gasifier-caisson-CNG dispenser-CNG vehicle
Carrier gas bottle
LNG cryogenic liquid is flowed into the pump chamber of plunger pump using pressure difference in LNG storage tank, passes through plunger pump pump head piston rod
High speed reciprocating motion, the LNG of low pressure (0.3MPa-0.9MPa) is gradually pressurized, into high pressure gasifier, high pressure gasifier
Due to drawing the heat in ambient air, LNG gasification is made to be transformed into CNG, CNG is by the regulation of sequential control disk, by suitable
Sequence enters CNG caisson, and CNG dispenser takes gas out of CNG caisson, completes the aerating to automobile and works.Whole flow process
By the control system control of the station PLC, when caisson pressure reaches the specified upper limit, plunger pump autostop；When the pressure of caisson
When power is lower than specified lower limit, plunger pump starts automatically, realizes automatic inflating function.
Regulating process: LNG storage tank-storage tank booster-LNG storage tank
Part LNG is transported to storage tank booster in LNG storage tank, returns to storage tank gas phase after LNG endothermic gasification, improves LNG storage
Pressure tank is to setting value, it is ensured that gas station even running.
Pressure release process: LNG storage tank-manual drain valve/self-draining valve/safety valve-desorption tube
When LNG storage tank pressure is higher than LNG storage tank service pressure, it is depressured using manual drain valve；When LNG storage tank pressure
When power continues to be increased above self-draining valve setting pressure, self-draining valve can automatically turn on decompression；When LNG storage tank pressure is held
It is continuous when being increased above LNG storage tank safety valve setting pressure, safety valve jumping up decompression.
Standby process
The quick action emergency valve of LNG storage tank liquid valve and selected plunger pump input terminal is switched on, and is kept liquid circulation, is made plunger
Pump pump pond is continuously in low-temperature condition, can open pump aerating at any time.If not wanting that the plunger pump is allowed to carry out liquid circulation, pass through PLC
Control system operatio of standing is changed to the pump " to shut down "；Or selection is automatic, it will autostop without operation in certain time.
Shut down process
The autocontrol valve controlled in system operatio control L-CNG loading system of being stood by PLC is closed, L-CNG filling system
Unite other valves operate as needed on or off；As long as system does not power off, the monitoring such as pressure, liquid level, flammable, ESD still can be after
It is continuous, to ensure that gas station is in a safe condition.
Claims (8)
1. a kind of L-CNG loading system, including unloading unit, LNG storage tank, storage tank booster, plunger pump sledge, high pressure gasifier
Sledge, sequential control disk, caisson, CNG dispenser, instrument wind system, PLC station control system and flammable gas alarm, it is described
Unloading unit, LNG storage tank, plunger pump sledge, high pressure gasifier sledge, sequential control disk, caisson, CNG dispenser pass through natural
Air pipe is sequentially connected, and storage tank booster is connected in LNG storage tank by gas pipeline, and sequential control disk cuts caisson
Inflation is changed to guarantee the pressure of caisson, instrument wind system is pneumatic in entire L-CNG loading system for automatically controlling
The Push And Release of valve, PLC stand control system for automation control L-CNG filling process, and flammable gas alarm includes combustible gas
Bulk detector and gas alarm, combustible gas probe are respectively provided on plunger pump sledge and high pressure gasifier sledge, are used for
It detecting whether that natural gas leaking occurs, gas alarm is located in control room, when natural gas leaking occurs, fuel gas
Detector and gas alarm are simultaneously emitted by alarm, it is characterised in that: there are two plunger pumps in parallel on plunger pump sledge, point
The first plunger pump (1) and the second plunger pump (2) for not being, two plunger pump one work one is spare or two make simultaneously
With having two high pressure gasifiers in parallel on high pressure gasifier sledge, respectively the first high pressure gasifier (3) and second high-pressure gasified
Device (4), two high pressure gasifier one work one it is spare, two plunger pumps in parallel high pressure gasifier in parallel with two it
Between be equipped with 3 high-pressure stop valves, by controlling the switch of 3 high-pressure stop valves, it can be achieved that any one plunger pump is corresponding any
One high pressure gasifier.
2. L-CNG loading system according to claim 1, it is characterised in that: the plunger pump sledge is connected from conveying entrance
There are first pressure transmitter (5), pipeline in parallel twice is connected in first pressure transmitter (5) output end, wherein a pipe
Line is stopped by the first quick action emergency valve (6), the first strainer valve (8), the first plunger pump (1), second pressure transmitter (10) and first
It goes back to valve (12) to be successively linked in sequence along defeated air supply direction, is equipped with the first temperature transmitter (14) on the first plunger pump (1), it is another
Time pipeline is by the second quick action emergency valve (7), the second strainer valve (9), the second plunger pump (2), third pressure transmitter (11) and the
Two check-valves (13) are successively linked in sequence along defeated air supply direction, are equipped with second temperature transmitter (15) on the second plunger pump (2).
3. L-CNG loading system according to claim 1, it is characterised in that: the high pressure gasifier sledge from conveying entrance
It is connected with the first high pressure gasifier (3), the first high-pressure ball valve (21), the 4th pressure transmitter (23), third high-pressure ball valve in turn
(24) and third temperature transmitter (28), the input end of water-bath type heater (27) are connected with the 4th high-pressure ball valve (25), water-bath
The outlet end of formula heater (27) is connected with the 5th high-pressure ball valve (26), and the input terminal of the 4th high-pressure ball valve (25) is connected to third
The output end of the input terminal of high-pressure ball valve (24), the 5th high-pressure ball valve (26) is connected to the output end of third high-pressure ball valve (24),
Second high pressure gasifier (4) and the second high-pressure ball valve (22) along defeated air supply direction be sequentially connected after access the 4th pressure transmitter
(23) input terminal.
4. L-CNG loading system according to claim 1, it is characterised in that: in first plunger pump (1), the second column
Release pipeline is all had additional on plug pump (2), the first high pressure gasifier (3) and the second high pressure gasifier (4) respective export pipeline,
The gas in pipeline is diffused after safety valve pressure release, is collected in high pressure EAG gasifier (29) and is diffused after heating.
5. L-CNG loading system according to claim 4, it is characterised in that: in the first plunger pump (1) output end
It is connected with third quick action emergency valve (16) on release pipeline, third quick action emergency valve (16) is for guaranteeing the first plunger pump (1) no
Bringing onto load carries out opening machine, is connected with the 4th quick action emergency valve (17) on the release pipeline of the second plunger pump (2) output end, and the 4th
Quick action emergency valve (17) is for guaranteeing that the second plunger pump (2) bringing onto load does not carry out opening machine.
6. L-CNG loading system according to claim 1, it is characterised in that: in the return line of plunger pump sled
Equipped with temperature transmitter.
7. L-CNG loading system according to claim 1, it is characterised in that: in the return line of plunger pump sled
Equipped with shut-off valve.
8. L-CNG loading system according to claim 1, it is characterised in that: increase on the muffler of plunger pump sled
Equipped with blowdown line in parallel twice, stop valve is respectively equipped on blowdown line, a stop valve output end is equipped with wherein
Safety valve, another stop valve output end merge output with safety valve output end.
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| CN201820989109.6U CN208735264U (en) | 2018-06-26 | 2018-06-26 | A kind of L-CNG loading system |
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| CN201820989109.6U CN208735264U (en) | 2018-06-26 | 2018-06-26 | A kind of L-CNG loading system |
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