CN105257976A - Compressed natural gas discharging device and adjustment and control method - Google Patents
Compressed natural gas discharging device and adjustment and control method Download PDFInfo
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- CN105257976A CN105257976A CN201510707869.4A CN201510707869A CN105257976A CN 105257976 A CN105257976 A CN 105257976A CN 201510707869 A CN201510707869 A CN 201510707869A CN 105257976 A CN105257976 A CN 105257976A
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Abstract
The invention discloses a compressed natural gas discharging device and an adjustment and control method. The compressed natural gas discharging device is mainly composed of gas discharging columns, a vacuum heating furnace, a pressure adjusting device, a PLC automatic control system and the like. According to the technical scheme, incoming gas of tank trucks is metered through the discharging columns and then enters the heating furnace; when the pressure of the incoming gas is high, natural gas is directly discharged through a high-pressure adjusting pipeline; when the pressure of the incoming gas is low, the procedure is automatically switched, and the natural gas enters a low-pressure adjusting pipeline and is decompressed to the allowed inlet pressure of a compressor and then pressurized and discharged; the pressure and the temperature of the pressure-adjusted natural gas are monitored in real time through the PLC automatic control system, and after a judgment is made according to the hydrate generation condition, the power and the gas discharging speed of the heating furnace are adjusted in real time; and the compressor is automatically started and stopped and the conversion control over the gas discharging procedure of a single tank truck or the multiple tank trucks is achieved. The compressed natural gas discharging device is suitable for recycling and discharging operation of marginal natural gas such as scattered natural gas, shale gas and oil field associated gas, the automation degree is high, hydrate are prevented and treated, and meanwhile the purposes that gas discharging efficiency is improved, and the tank truck residual gas volume, the device heating energy consumption and operation risks are reduced are achieved.
Description
Technical field
The present invention relates to a kind of CNG tank car is reclaimed the marginal rock gas such as retail natural gas, shale gas, associated gas safety, efficiently unload put the fields, station such as natural gas collecting station, outer defeated station into unload device of air, be specifically related to a kind of compressed natural gas and unload device of air and adjustment control method, belong to gas gathering and transportation engineering field.
Background technique
The Unconventional forage fields such as conventional gas field and shale gas, in exploration and development process, due to reason such as needs probing well, evaluation well etc., inevitably produce the scattered outlying individual well that some output are lower, far away again apart from gas gathering station.In addition, oil field on stream, can from crude oil generating portion associated gas, its main component is also CH
4, but output is lower.These marginal natural gas resources owing to yielding poorly, comparatively far away apart from gas gathering station, according to the construction gathering line mode of movement of routine, obviously will not have a business extraction value.Especially for associated gas, if do not reclaim it, generally can only carry out lasting emptying burning process at present, both waste resource, and also substantial pollution was produced to surrounding environment.
At present, the domestic recycling for marginal poor efficiency rock gases such as scattered individual well gas, shale gas, associated gas mainly contains the modes such as CNG recovery, LNG recovery.What domestic application was comparatively ripe is CNG recovery technology, its main technique pours in CNG tank car after using reciprocal compressor to be pressurized to 20MPa to retail natural gas, field, station inject the defeated or outer defeated pipe network of collection by tank car roping to natural gas collecting station, outer defeated station etc. again, thus realize carrying out high efficiency, low cost recovery to the marginal rock gas originally had no commercial value.
Due to unloading in gas initial stage CNG tank car gas pressure up to 20MPa, and natural gas station internal pressure generally only has 0.5 ~ 8MPa, and unloading, choke pressure drop temperature drop in gas process is large.When particularly winter environment temperature is lower, in process pipeline, very easily produces hydrate cause ice to block up, reduce and unload gas speed, unload gas even completely.And to unload gas process be a typical dynamic process, along with the carrying out unloading gas, in CNG tank car, rock gas air pressure reduces gradually, pressure drop temperature drop also corresponding reduction before and after pressure governor, for control gas hydrates generate needed for add heat also in reduction.Current existing CNG unloads device of air and generally adopts water batch heater or electrically heated mode to carry out water prevention compound, but existing apparatus has the following disadvantages: 1) unload controlled atmosphere pressure export pipeline and generally only have one, the reciprocal compressor of supercharging is not aspirated yet, the residual air pressure causing CNG tank car not draw off is high, remaining volume is large, reduce the effective transport capacity of tank car, add cost of transportation; 2) automaticity is low, can not temperature evaluate hydrate in process pipeline and generate risk after Real-Time Monitoring heated by natural gas, oven often adopts constant heating power to heat rock gas, can not adjust in real time according to technique actual demand, cause heater energy consumption high, and add plant running risk.
Summary of the invention
The object of the invention is to overcome above-mentioned technological deficiency, provides a kind of compressed natural gas to unload device of air and adjustment control method.This device technique is simple, and can realize compressor automatic start-stop, list/multichannel tank car unloads air-flow journey and high low pressure unloads the automatic switchover of air-flow journey, automaticity is high; This adjustment control method, while water prevention compound generates, also can improve and unload gas efficiency, reduces heating energy consumption and the operation risk of tank car remaining volume and heating equipment, improves plant running reliability and stability.
For achieving the above object, the present invention adopts technological scheme as follows:
A kind of compressed natural gas unloads device of air, comprises discharge column, vacuum furnace, regulator and PLC robot control system(RCS); It is characterized in that: discharge column is connected with compressed natural gas tank car by anti-Pull breaking ualve, follow-up mass flowmenter, safety check are installed successively; Vacuum furnace entrance point is connected by gate valve with discharge column outlet end, and burner fuel gas suction tude is provided with fuel control valve, and its opening amount signal is connected with PLC robot control system(RCS); Regulator comprises high pressure pressure regulation pipeline and low-pressure adjusting pressure pipe road, and be connected with vacuum furnace outlet end respectively, and connecting pipeline is equipped with electric ball valve, its opening amount signal is connected with PLC robot control system(RCS); High pressure pressure regulation pipeline installation high-voltage pressure governor, Safety relief valve, safety check successively; Low-pressure adjusting pressure pipe road is setting pressure valuator, low-pressure adjusting depressor, reciprocal compressor, Safety relief valve, safety check successively; Reciprocal compressor is imported and exported and connecting pipeline is established by bypass regulator; Before regulator, pipeline is provided with pressure transducer, and after high-voltage regulator and low-pressure adjusting depressor, pipeline is equipped with pressure transducer and temperature transducer, and corresponding pressure and temperature signal is all connected to PLC robot control system(RCS).
Described discharge column, high pressure pressure regulation pipeline and low-pressure adjusting pressure pipe road are multi-channel parallel; After discharge column, parallel pipeline is by electric ball valve UNICOM in parallel; The on off state of the remote controlled electric ball valve in parallel of PLC robot control system(RCS).
Described high pressure pressure regulation pipeline and low-pressure adjusting pressure pipe road automatic switching method are: described pressure valuator block pressure set points P
02 ~ 3MPa higher than natural gas station decanting point pressure; When carrying out atmospheric pressure higher than P
0time, pressure valuator is closed automatically, and rock gas enters the decompression of high pressure pressure regulation pipeline and unloads gas to natural gas station decanting point; P is down to when carrying out atmospheric pressure
0and time following, pressure valuator is opened automatically, and rock gas enters low-pressure adjusting pressure pipe road, after being decompressed to reciprocal compressor permission inlet pressure, repressurize unloads gas to natural gas station decanting point.
Described reciprocal compressor automatic start-stop controlling method is: if gas pressure is down to P before pressure valuator
0and below, reciprocal compressor starts under PLC robot control system(RCS) controls; If not, then do not start; If gas pressure is lower than its minimum permission suction pressure P before reciprocal compressor
1, then autostop; If not, then normally run.
Described adjustment control method, namely unloads hydrate prevention and controls in gas rate adaptation and process pipeline and is characterised in that:
Step 1 judges pressure transducer institute measuring pressure P before electric ball valve
2whether > P
0, if so, then go to step 2; If not, then 10 are gone to step;
The temperature transducer that step 2 judges on high pressure pressure regulation pipeline reach the temperature value of PLC automatic control device whether>=t
0+ 3 ~ 5 DEG C, wherein t
0for the pressure transducer institute measuring pressure P on high pressure pressure regulation pipeline
3corresponding gas hydrates generate temperature, if so, then go to step 7; If not, then 3 are gone to step;
Step 3 judges whether fuel control valve reaches maximum opening, if so, then goes to step 4; If not, then 6 are gone to step;
Step 4 reduces electric ball valve aperture;
The temperature transducer that step 5 judges on high pressure pressure regulation pipeline reach the temperature value of PLC robot control system(RCS) whether>=t
0+ 3 ~ 5 DEG C, if so, then go to step 9; If not, then 3 are gone to step;
Step 6 increases fuel adjusting valve opening and goes to step 5;
The temperature transducer that step 7 continues to judge on high pressure pressure regulation pipeline reaches the temperature value whether > t of PLC robot control system(RCS)
0+ 8 ~ 10 DEG C, if so, then go to step 8; If not, then 9 are gone to step;
Step 8 reduces fuel adjusting valve opening, and judges that temperature transducer reaches the temperature value whether > t of PLC robot control system(RCS)
0+ 8 ~ 10 DEG C, if so, then continue to reduce fuel adjusting valve opening; If not, then 5 are gone to step;
Step 9 maintains existing state of a control, completes a Hydrate Formation Conditions and judges and control; PLC robot control system(RCS) setting certain time interval, interval starts Hydrate Formation Conditions and judges;
Step 10 repeats step 2 ~ 9, but now in step 2,5,7 PLC robot control system(RCS) all should adopt the temperature transducer measured temperature value on low-pressure adjusting pressure pipe road, and the t of correspondence
0value is the pressure transducer institute measuring pressure P on low-pressure adjusting pressure pipe road
4corresponding gas hydrates generate temperature.
The present invention, owing to adopting above technological scheme, has the following advantages:
Apparatus of the present invention technique is simple, reciprocal compressor automatic start-stop can be realized, list/multichannel tank car unloads air-flow journey and to automatically switch and high low pressure pipeline unloads the automatic switchover of air-flow journey, automaticity is high, simple to operate, there is raising tank car and unload gas efficiency, reduce tank car remaining volume, increase tank car transport capacity, reduce the advantages such as cost of transportation;
The control that the adjustment that the adjustment control method that the present invention relates to realizes by PLC robot control system(RCS) unloading gas speed generates with hydrate in process pipeline, have while preventing gas hydrates from generating, minimizing device heats the advantage of energy consumption and operation risk.
Accompanying drawing explanation
Fig. 1 is that a kind of compressed natural gas of the present invention unloads device of air structural representation;
Fig. 2 is that a kind of compressed natural gas of the present invention unloads in gas process the PLC control logic figure unloading gas rate adaptation and hydrate and prevent and treat;
Fig. 3 is the PLC control logic figure that a kind of compressed natural gas of the present invention unloads reciprocal compressor automatic start-stop in gas process;
In figure: 1, tank car; 2, discharge column; 3, anti-Pull breaking ualve; 4, gate valve; 5, mass flowmenter; 6, safety check; 7, electric ball valve in parallel; 8, vacuum furnace; 9, burner; 10, fuel control valve (XV-101); 11, pressure transducer (PT-101, PT-102); 12, electric ball valve (XV-102, XV-103); 13, regulator; 14, high-voltage regulator; 15, pressure valuator; 16, low-pressure adjusting depressor; 17, reciprocal compressor; 18, bypass regulator; 19, pressure transducer (PT-103, PT-105); 20, temperature transducer (TT-101, TT-103); 21, pressure transducer (PT-104, PT-106); 22, temperature transducer (TT-102, TT-104); 23, safety check; 24, PLC robot control system(RCS); 25, Safety relief valve; 26, blowdown valve.
Embodiment
Present invention illustrates a kind of compressed natural gas and unload device of air, this device can be arranged on any natural gas station having compressed natural gas tank car to unload gas.As shown in Figure 1: apparatus of the present invention comprise discharge column (2), vacuum furnace (8), regulator (13) and PLC robot control system(RCS) (24); Described discharge column (2) entrance point is connected with compressed natural gas tank car (1) by high pressure hose; Described vacuum furnace (8) entrance point is connected by gate valve with discharge column (2) outlet end, be provided with burner (9), described burner (9) fuel gas suction tude is provided with fuel control valve (10), and its opening amount signal is connected with PLC robot control system(RCS) (24); Vacuum furnace (8) is provided with blowdown valve (26); Described regulator (13) is provided with high pressure pressure regulation pipeline and low-pressure adjusting pressure pipe road, be connected with vacuum furnace (8) outlet end respectively, and connecting pipeline is provided with successively pressure transducer (PT-101, PT-102) (11) and electric ball valve (12), and be all connected with PLC robot control system(RCS) (24); High pressure pressure regulation pipeline is provided with high-voltage regulator (14), Safety relief valve (25), safety check (23) successively; Low-pressure adjusting pressure pipe road is provided with pressure valuator (15), low-pressure adjusting depressor (16), reciprocal compressor (17), Safety relief valve (25), safety check (23) successively; Reciprocal compressor (17) is imported and exported connecting pipeline and is provided with bypass regulator (18); High-voltage regulator (14) and low-pressure adjusting depressor (15) afterwards pipeline are equipped with pressure transducer (PT-103, PT-105) (19), (PT-104, PT-106) (21) and temperature transducer (TT-101, TT-103) (20), (TT-102, TT-104) (22), and relevant pressure and temperature signal are all connected to PLC robot control system(RCS) (24).
What composition graphs 1 illustrated apparatus of the present invention unloads gas technological process:
When single measuring tank car carrys out gas, compressed natural gas tank car (1) is connected with discharge column (2) by anti-Pull breaking ualve (3), and discharge column (2) carries out pressure, temperature detection measuring to compressed natural gas; PLC robot control system(RCS) (24) opens electric ball valve in parallel (7), and compressed natural gas divides two-way to enter vacuum furnace (8), and the rock gas being heated to setting temperature enters pressure regulator (13); The rear gas pressure of heating measured by pressure transducer (11), and signal reached PLC automatic control device (24); If institute pressure measurement force value P
2higher than pressure valuator (15) setting value P
0time, pressure valuator (15) is closed automatically, and the high pressure pressure regulation pipeline decompression that rock gas enters multi-channel parallel unloads gas to natural gas station decanting point; If institute pressure measurement force value P
2be down to P
0and time following, pressure valuator (15) is opened automatically, PLC robot control system(RCS) (24) starts reciprocal compressor (17), rock gas enters the low-pressure adjusting pressure pipe road of multi-channel parallel, and after being decompressed to reciprocal compressor permission suction pressure, repressurize unloads gas to natural gas station decanting point; When reciprocal compressor (17) front gas pressure is lower than its minimum permission suction pressure P
1time, reciprocal compressor (17) autostop, completes tank car and unloads gas.
When many tank cars unload gas simultaneously, PLC robot control system(RCS) (24) closes electric ball valve in parallel (7), what device switched to multi-channel parallel unloads device of air, device of air is unloaded successively by discharge column (2), vacuum furnace (8) and regulator (13) in every road, and every road is unloaded device of air and is independent of each other; Single channel unloads device of air, and to unload gas technological process as follows:
Compressed natural gas tank car (1) is connected with discharge column (2) by anti-Pull breaking ualve (3), and compressed natural gas enters vacuum furnace (8) after discharge column (2) pressure measurement, thermometric also metering; The rock gas being heated to setting temperature enters regulator (13); The rear gas pressure of heating measured by pressure transducer (11), and signal reached PLC automatic control device (24); If institute pressure measurement force value P
2higher than pressure valuator (15) setting value P
0time, pressure valuator (15) is closed automatically, and rock gas enters the decompression of high pressure pressure regulation pipeline and unloads gas to natural gas station decanting point; If institute pressure measurement force value P
2be down to P
0and time following, pressure valuator (15) is opened automatically, PLC robot control system(RCS) (24) starts reciprocal compressor (17), rock gas enters low-pressure adjusting pressure pipe road, and after being decompressed to reciprocal compressor permission suction pressure, repressurize unloads gas to natural gas station decanting point; When reciprocal compressor (17) front gas pressure is lower than its minimum permission suction pressure P
1time, reciprocal compressor (17) autostop, completes tank car and unloads gas.
Composition graphs 2, Fig. 3 illustrate the PLC control logic that a kind of compressed natural gas of the present invention unloads gas adjustment control method, and concrete steps are as follows:
Step 1 compressed natural gas starts PLC robot control system(RCS) (24) after high-voltage regulator (14), starts Hydrate Formation Conditions arbitration functions in PLC robot control system(RCS) (24); Judge pressure transducer (PT-101, PT-102) (11) institute measuring pressure P
2whether > P
0, if so, then go to step 2; If not, then 10 are gone to step;
Step 2 judge temperature transducer (TT-101, TT-103) (20) reach the temperature value of PLC robot control system(RCS) (24) whether>=t
0+ 3 ~ 5 DEG C, wherein t
0for pressure transducer (PT-103, PT-105) (19) institute measuring pressure P
3corresponding gas hydrates generate temperature, if so, then go to step 7; If not, then 3 are gone to step;
Step 3 judges whether fuel control valve (10) reaches maximum opening, if so, then goes to step 4; If not, then 6 are gone to step;
Step 4 reduces electric ball valve (12) aperture;
Step 5 continue to sentence temperature transducer (TT-101, TT-103) (20) reach the temperature value of PLC robot control system(RCS) (24) whether>=t
0+ 3 ~ 5 DEG C, if so, then go to step 9; If not, then 3 are gone to step;
Step 6 increases fuel control valve (10) aperture and skips to step 5;
Step 7 continues to sentence the temperature value whether > t that temperature transducer (TT-101, TT-103) (20) reach PLC robot control system(RCS) (24)
0+ 8 ~ 10 DEG C, if so, then go to step 8; If not, then 9 are gone to step;
Step 8 reduces fuel control valve (10) aperture, and judges that temperature transducer (TT-101, TT-103) (20) reach the temperature value whether > t of PLC robot control system(RCS) (24)
0+ 8 ~ 10 DEG C, if so, then continue to reduce fuel control valve (10) aperture; If not, then 5 are gone to step;
Step 9 maintains existing state of a control, completes a Hydrate Formation Conditions and judges and control; PLC robot control system(RCS) (24) sets certain interval time, and interval starts Hydrate Formation Conditions and judges.
Step 10 repeats step 2 ~ 9, but now in step 2,5,7 PLC robot control system(RCS) (24) temperature transducer (TT-102, TT-104) (22) measured temperature value all should be adopted, and the t of correspondence
0value should be pressure transducer (PT-104, PT-106) (21) institute measuring pressure P
4corresponding gas hydrates generate temperature.
Fig. 3 is the PLC control logic figure of reciprocal compressor automatic start-stop, and its method is: if pressure valuator (15) front gas pressure is down to P
0and below, reciprocal compressor starts under PLC robot control system(RCS) (24) controls; If not, then do not start; If gas pressure is lower than reciprocal compressor minimum permission suction pressure P before reciprocal compressor
1, reciprocal compressor is autostop then, completes supercharging and unloads gas operation; If not, then normally run.
Claims (5)
1. compressed natural gas unloads a device of air, comprises discharge column (2), vacuum furnace (8), regulator (13) and PLC robot control system(RCS) (24); It is characterized in that: discharge column (2) is connected with compressed natural gas tank car (1) by anti-Pull breaking ualve (3), follow-up mass flowmenter (5), safety check (6) are installed successively; Vacuum furnace (8) entrance point is connected by gate valve with discharge column (2) outlet end, burner (9) fuel gas suction tude is provided with fuel control valve (10), and its opening amount signal is connected with PLC robot control system(RCS) (24); Regulator (13) comprises high pressure pressure regulation pipeline and low-pressure adjusting pressure pipe road, be connected with vacuum furnace (8) outlet end respectively, connecting pipeline is equipped with electric ball valve (12), its opening amount signal is connected with PLC robot control system(RCS) (24); High pressure pressure regulation pipeline is provided with high-voltage regulator (14), Safety relief valve (25), safety check (23) successively; Low-pressure adjusting pressure pipe road is provided with pressure valuator (15), low-pressure adjusting depressor (16), reciprocal compressor (17), Safety relief valve (25), safety check (23) successively; Reciprocal compressor (17) is imported and exported connecting pipeline and is provided with bypass regulator (18); Regulator (13) front pipeline is provided with pressure transducer (11), high-voltage regulator (14) and low-pressure adjusting depressor (16) afterwards pipeline are respectively equipped with pressure transducer (19), (21) and temperature transducer (20), (22), and relevant pressure and temperature signal are all connected to PLC robot control system(RCS) (24).
2. compressed natural gas unloads device of air as claimed in claim 1, it is characterized in that: described discharge column (2), high pressure pressure regulation pipeline and low-pressure adjusting pressure pipe road are multi-channel parallel; Discharge column (2) afterwards parallel pipeline by electric ball valve in parallel (7) UNICOM; The on off state of the remote controlled electric ball valve in parallel (7) of PLC robot control system(RCS) (24).
3. as claimed in claim 1 compressed natural gas unloads device of air, and its high pressure pressure regulation pipeline and low-pressure adjusting pressure pipe road automatic switching method are: described pressure valuator (15) block pressure set points P
02 ~ 3MPa higher than natural gas station decanting point pressure; When carrying out atmospheric pressure higher than P
0time, pressure valuator (15) is closed automatically, and rock gas enters the decompression of high pressure pressure regulation pipeline and unloads gas to natural gas station decanting point; P is down to when carrying out atmospheric pressure
0and time following, pressure valuator (15) is opened automatically, and rock gas enters low-pressure adjusting pressure pipe road, after being decompressed to reciprocal compressor (17) permission inlet pressure, repressurize unloads gas to natural gas station decanting point.
4. compressed natural gas unloads device of air as claimed in claim 1, and its reciprocal compressor automatic start-stop controlling method is: if pressure valuator (15) front gas pressure is down to P
0and below, reciprocal compressor starts under PLC robot control system(RCS) (24) controls; If not, then do not start; If gas pressure is lower than reciprocal compressor minimum permission suction pressure P before reciprocal compressor
1, reciprocal compressor is autostop then, completes supercharging and unloads gas operation; If not, then normally run.
5. compressed natural gas unloads device of air as claimed in claim 1, and it unloads hydrate prevention and controls in gas rate adaptation and process pipeline and is:
Step 1 judges pressure transducer (11) institute measuring pressure P
2whether > P
0, if so, then go to step 2; If not, then 10 are gone to step;
Step 2 judge temperature transducer (20) reach the temperature value of PLC robot control system(RCS) (24) whether>=t
0+ 3 ~ 5 DEG C, wherein t
0for pressure transducer (19) institute measuring pressure P
3corresponding gas hydrates generate temperature, if so, then go to step 7; If not, then 3 are gone to step;
Step 3 judges whether fuel control valve (10) reaches maximum opening, if so, then goes to step 4; If not, then 6 are gone to step;
Step 4 reduces electric ball valve (12) aperture;
Step 5 continue to judge temperature transducer (20) reach the temperature value of PLC robot control system(RCS) (24) whether>=t
0+ 3 ~ 5 DEG C, if so, then go to step 9; If not, then 3 are gone to step;
Step 6 increases fuel control valve (10) aperture and goes to step 5;
Step 7 continues to judge that temperature transducer (20) reaches the temperature value whether > t of PLC robot control system(RCS) (24)
0+ 8 ~ 10 DEG C, if so, then go to step 8; If not, then 9 are gone to step;
Step 8 reduces fuel control valve (10) aperture, and judges that temperature transducer (20) reaches the temperature value whether > t of PLC robot control system(RCS) (24)
0+ 8 ~ 10 DEG C, if so, then continue to reduce fuel control valve (10) aperture; If not, then 5 are gone to step;
Step 9 maintains existing state of a control, completes a Hydrate Formation Conditions and judges and control; PLC robot control system(RCS) (24) sets certain interval time, and interval starts Hydrate Formation Conditions and judges.
Step 10 repeats step 2 ~ 9, but now in step 2,5,7 PLC robot control system(RCS) (24) temperature transducer (22) measured temperature value all should be adopted, and the t of correspondence
0value should be pressure transducer (21) institute measuring pressure P
4corresponding gas hydrates generate temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510707869.4A CN105257976A (en) | 2015-10-27 | 2015-10-27 | Compressed natural gas discharging device and adjustment and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510707869.4A CN105257976A (en) | 2015-10-27 | 2015-10-27 | Compressed natural gas discharging device and adjustment and control method |
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| Publication Number | Publication Date |
|---|---|
| CN105257976A true CN105257976A (en) | 2016-01-20 |
Family
ID=55097801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510707869.4A Pending CN105257976A (en) | 2015-10-27 | 2015-10-27 | Compressed natural gas discharging device and adjustment and control method |
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| CN (1) | CN105257976A (en) |
Cited By (3)
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| CN105650884A (en) * | 2016-01-31 | 2016-06-08 | 江苏韩通船舶重工有限公司 | Water heating system for compressed natural gas vessel and working method thereof |
| CN106641730A (en) * | 2016-11-30 | 2017-05-10 | 南京妙策传媒有限公司 | Natural gas liquefying process supercharging device capable of being adjusted in real time |
| CN108167647A (en) * | 2018-01-22 | 2018-06-15 | 北京东方通捷燃气有限责任公司 | A kind of natural gas is stood to a high-profile |
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Application publication date: 20160120 |