CN105927852A - Natural gas unloading method - Google Patents
Natural gas unloading method Download PDFInfo
- Publication number
- CN105927852A CN105927852A CN201610557807.4A CN201610557807A CN105927852A CN 105927852 A CN105927852 A CN 105927852A CN 201610557807 A CN201610557807 A CN 201610557807A CN 105927852 A CN105927852 A CN 105927852A
- Authority
- CN
- China
- Prior art keywords
- valve
- liquid
- tank car
- gas
- unloading
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
- F17C2205/0332—Safety valves or pressure relief valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
- F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
- F17C2225/0146—Two-phase
- F17C2225/0153—Liquefied gas, e.g. LPG, GPL
- F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
Abstract
A natural gas unloading method is characterized in that a natural gas unloading apparatus comprises a tank car and a liquid storage tank, a gas phase tube and a liquid phase tube are arranged between the tank car and the liquid storage tank, a connecting tube provided with a connecting valve is arranged between the gas phase tube and the liquid phase tube, the liquid phase tube is provided with a liquid discharge valve, an upper liquid feeding valve and a lower liquid feeding valve, the gas phase tube is provided with a gas phase valve I and a gas phase valve II, the tank car is externally provided with a boosting compressor, and the boosting compressor is connected with the tank car through a boosting valve. In the unloading process, natural gas in the liquid storage tank is discharged and is input to the tank car to boost the tank car, the tank car is boosted by using the boosting compressor in the late stage, and the unloading speed and the unloading efficiency of the natural gas in the tank car are improved through combining a pressure between the tank car and the liquid storage tank and the liquid condition in the tank car and properly regulating the working of all valves and the boosting compressor, so the method is convenient to operate, saves 30-50% of the time, and realizes accurate unloading, the weight of the tank car reaches standard, and the more or less clause is controlled to be in a range of -0.3% ~ 3.0%.
Description
Technical field
The present invention relates to a kind of method of unloading of high pressure liquefied gas, particularly to a kind of method of unloading of natural gas.
Background technology
At present, during the unloading of liquefied natural gas, after LNG tank car liquid phase is unsnatched, in tank car, residual air pressure reaches 0.45-0.5MPa, again cannot draw off, residual air residual quantity, at more than 200kg, cannot meet purchase business and require that the turnover pound difference of tank car must not exceed the requirement of 3 ‰, in tank car, residual quantity is many, easily causes waste.And press pump is taken out in existing unloading way many employings increase, reaching the requirement unloaded, like this, cost of unloading is high, and is difficult to reach high-precision requirement of unloading.
Summary of the invention
The technical problem to be solved is for the deficiencies in the prior art, it is provided that a kind of reasonable in design, easy to use, the method for unloading of the natural gas required that can precisely reach to unload.
nullThe technical problem to be solved is to be realized by following technical scheme，The present invention is a kind of method of unloading of natural gas，It is characterized in，Including tank car and fluid reservoir，Tank car is provided with gas outlet and liquid outlet，Described fluid reservoir is provided with inlet、Lower inlet and air inlet，Gas phase pipe it is provided with between gas outlet and air inlet，Liquid-phase tube it is provided with at liquid outlet，Liquid-phase tube is connected with the inlet up and down on fluid reservoir by upper and lower feed tube，Connected by communicating pipe between gas phase pipe and liquid-phase tube，Communicating pipe is communicated with valve，Gas phase pipe near gas outlet is provided with gas valve I，Gas phase pipe near air inlet is provided with gas valve II，Liquid-phase tube near liquid outlet is provided with liquid valve，Upper feed tube near upper inlet is provided with liquid feed valve，Lower feed tube near lower inlet is provided with lower liquid feed valve，It is externally provided with supercharging sled at tank car，The import of supercharging sled is connected with tank car by pipeline，The outlet of supercharging sled is connected with gas phase pipe by pipeline，Pipeline between supercharging sled and tank car is provided with pressure charging valve；
nullWhen unloading，Open gas valve II、Communicating valve and liquid valve，Natural gas in fluid reservoir passes sequentially through gas phase pipe、Communicating pipe and liquid-phase tube are passed through tank car，Pressure in fluid reservoir is declined，After dropping to 0.4 below MPa，Open gas valve I，After the pressure balance in the pressure in tank car with fluid reservoir，Close gas valve II，Open liquid feed valve and pressure charging valve，Start supercharging sled，Liquid in tank car is entered in tank car to tank car supercharging after being prized by supercharging at gas phase pipe，The aperture of liquid valve is regulated while supercharging，Treat that the pressure in tank car reaches between 0.65-0.7 MPa，Liquid valve is fully opened，Normally unload，Unload to tank car liquid level when being 150-200mm，Liquid feed valve in closedown，Open lower liquid feed valve，Close pressure charging valve and gas valve I，Liquid valve is closed 80%-90%，Continue to unload，After the pressure unloaded to tank car arrives 0.3 below MPa，Close supercharging sled and all of valve，Unload complete.
The technical problem to be solved can also be realized further by following technical scheme, and after closing pressure charging valve, the residual night in supercharging sled enters in fluid reservoir with liquid-phase tube through communicating pipe from gas phase pipe.
The technical problem to be solved can also be realized further by following technical scheme, is provided with air vent on described fluid reservoir, and exhaust ports is provided with air bleeding valve.
The present invention is during unloading, first pass through the natural gas discharged in fluid reservoir, input to tank car, to tank car supercharging, later-stage utilization supercharging is prized to tank car supercharging, in conjunction with the pressure between tank car and fluid reservoir and the level condition in tank car, regulating and controlling each valve and the work of supercharging sled, in raising tank car, natural gas unloads vehicle speed and efficiency in good time.Compared with prior art, it is reasonable in design, easy to operate, has saved the time of 30%-50%, unloads accurate, and the weight of tank car is up to standard, and turnover pound difference controls in ± 3 ‰.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
Referring to the drawings, the concrete technical scheme of the present invention is further described, in order to those skilled in the art is further understood that the present invention, and does not constitute the restriction to its right.
With reference to Fig. 1, a kind of method of unloading of natural gas, including tank car 1 and fluid reservoir 9, tank car 1 is provided with gas outlet and liquid outlet, described fluid reservoir 9 is provided with inlet, lower inlet and air inlet, gas phase pipe 12 it is provided with between gas outlet and air inlet, liquid-phase tube 5 it is provided with at liquid outlet, liquid-phase tube 5 is connected with the inlet up and down on fluid reservoir 9 by upper feed tube 6, lower feed tube 7, by connecting communicating pipe 16 between gas phase pipe 12 with liquid-phase tube 5, being communicated with valve 4 on communicating pipe 16, the gas phase pipe 12 near gas outlet is provided with gas valve I
3, gas phase pipe 12 near air inlet is provided with gas valve II 10, liquid-phase tube 5 near liquid outlet is provided with liquid valve 2, upper feed tube 6 near upper inlet is provided with liquid feed valve 8, lower feed tube 7 near lower inlet is provided with lower liquid feed valve 11, is externally provided with supercharging sled 13 at tank car 1, and the import of supercharging sled 13 is connected with tank car 1 by pipeline, the outlet of supercharging sled 13 is connected with gas phase pipe 12 by pipeline, and the pipeline between supercharging sled 13 and tank car 1 is provided with pressure charging valve 14；
When unloading, open gas valve II 10, communicating valve 4 and liquid valve 2, natural gas in fluid reservoir 9 passes sequentially through gas phase pipe 12, communicating pipe 16 and liquid-phase tube 5 are passed through tank car 1, pressure in fluid reservoir 9 is declined, after dropping to 0.4 below MPa, open gas valve I 3, after the pressure balance in the pressure in tank car 1 with fluid reservoir 9, close gas valve II 10, open liquid feed valve 8 and pressure charging valve 14, start supercharging sled 13, liquid in tank car 1 is by giving tank car 1 supercharging in entrance tank car 1 after supercharging sled 13 at gas phase pipe 12, the aperture of liquid valve 2 is regulated while supercharging, treat that the pressure in tank car 1 reaches 0.65-0.7
Between MPa, liquid valve 2 is fully opened, normally unloads, when unloading that liquid level is 150-200mm to tank car 1, liquid feed valve 8 in closedown, open lower liquid feed valve 11, close pressure charging valve 14 and gas valve I 3, liquid valve 2 is closed 80%-90%, continue to unload, after the pressure unloaded to tank car 1 arrives 0.3 below MPa, close supercharging sled 13 and all of valve, unload complete.
After closing pressure charging valve 14, the residual night in supercharging sled 13 enters in fluid reservoir 9 with liquid-phase tube 5 through communicating pipe 16 from gas phase pipe 12.Described fluid reservoir 9 is provided with air vent 15, at air vent 15, is provided with air bleeding valve, it is ensured that tank car and the safety of fluid reservoir.
The present invention is during unloading, according to the pressure in tank car and fluid reservoir and the change of the liquid level of tank car, realizing switching and the work of supercharging sled of each valve, increase and decrease pressure, this method of unloading can reach and monitors accurately, weight is up to standard, the turnover pound difference of tank car controls in ± 3 ‰, compared with existing method of unloading, can save the time of 30%-50%, reduce waste, the difference of tank car can be met and unload requirement.
Claims (3)
- null1. the method for unloading of a natural gas，It is characterized in that: include tank car and fluid reservoir，Tank car is provided with gas outlet and liquid outlet，Described fluid reservoir is provided with inlet、Lower inlet and air inlet，Gas phase pipe it is provided with between gas outlet and air inlet，Liquid-phase tube it is provided with at liquid outlet，Liquid-phase tube is connected with the inlet up and down on fluid reservoir by upper and lower feed tube，Connected by communicating pipe between gas phase pipe and liquid-phase tube，Communicating pipe is communicated with valve，Gas phase pipe near gas outlet is provided with gas valve I，Gas phase pipe near air inlet is provided with gas valve II，Liquid-phase tube near liquid outlet is provided with liquid valve，Upper feed tube near upper inlet is provided with liquid feed valve，Lower feed tube near lower inlet is provided with lower liquid feed valve，It is externally provided with supercharging sled at tank car，The import of supercharging sled is connected with tank car by pipeline，The outlet of supercharging sled is connected with gas phase pipe by pipeline，Pipeline between supercharging sled and tank car is provided with pressure charging valve；nullWhen unloading，Open gas valve II、Communicating valve and liquid valve，Natural gas in fluid reservoir passes sequentially through gas phase pipe、Communicating pipe and liquid-phase tube are passed through tank car，Pressure in fluid reservoir is declined，After dropping to 0.4 below MPa，Open gas valve I，After the pressure balance in the pressure in tank car with fluid reservoir，Close gas valve II，Open liquid feed valve and pressure charging valve，Start supercharging sled，Liquid in tank car is entered in tank car to tank car supercharging after being prized by supercharging at gas phase pipe，The aperture of liquid valve is regulated while supercharging，When pressure in tank car reaches between 0.65-0.7 MPa，Liquid valve is fully opened，Normally unload，Unload to tank car liquid level when being 150-200mm，Liquid feed valve in closedown，Open lower liquid feed valve，Close pressure charging valve and gas valve I，Liquid valve is closed 80%-90%，Continue to unload，After the pressure unloaded to tank car arrives 0.3 below MPa，Close supercharging sled and all of valve，Unload complete.
- The method of unloading of natural gas the most according to claim 1, it is characterised in that: after closing pressure charging valve, the residual night in supercharging sled enters in fluid reservoir with liquid-phase tube through communicating pipe from gas phase pipe.
- The method of unloading of natural gas the most according to claim 1, it is characterised in that: being provided with air vent on described fluid reservoir, exhaust ports is provided with air bleeding valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610557807.4A CN105927852B (en) | 2016-07-15 | 2016-07-15 | A kind of method of unloading of natural gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610557807.4A CN105927852B (en) | 2016-07-15 | 2016-07-15 | A kind of method of unloading of natural gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105927852A true CN105927852A (en) | 2016-09-07 |
| CN105927852B CN105927852B (en) | 2018-01-09 |
Family
ID=56827978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610557807.4A Active CN105927852B (en) | 2016-07-15 | 2016-07-15 | A kind of method of unloading of natural gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105927852B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106764426A (en) * | 2016-11-17 | 2017-05-31 | 内蒙古大唐国际克什克腾煤制天然气有限责任公司 | A kind of Propylene Spherical Tanks with flood pattern |
| CN110081308A (en) * | 2019-05-30 | 2019-08-02 | 河南查瑞特种设备有限公司 | A kind of LNG unloading unit convenient for taking |
| CN111828835A (en) * | 2020-06-22 | 2020-10-27 | 王宝贵 | Method for setting automatic pressure increasing valve of low-temperature liquefied gas storage tank |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130180265A1 (en) * | 2012-01-17 | 2013-07-18 | Ron C. Lee | Method for refueling and operating natural gas fueled truck |
| CN103527924A (en) * | 2013-04-26 | 2014-01-22 | 洛阳新奥华油燃气有限公司 | Precooling method before unloading of LNG (Liquefied Natural Gas) tank wagon |
| CN204717342U (en) * | 2015-06-02 | 2015-10-21 | 石家庄市海森化工有限公司 | A kind of closed loop oxidative ethane unloading unit |
| CN205118653U (en) * | 2015-10-20 | 2016-03-30 | 苏州金华润泽能源有限公司 | LNG is from pressure boost device of unloading |
-
2016
- 2016-07-15 CN CN201610557807.4A patent/CN105927852B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130180265A1 (en) * | 2012-01-17 | 2013-07-18 | Ron C. Lee | Method for refueling and operating natural gas fueled truck |
| CN103527924A (en) * | 2013-04-26 | 2014-01-22 | 洛阳新奥华油燃气有限公司 | Precooling method before unloading of LNG (Liquefied Natural Gas) tank wagon |
| CN204717342U (en) * | 2015-06-02 | 2015-10-21 | 石家庄市海森化工有限公司 | A kind of closed loop oxidative ethane unloading unit |
| CN205118653U (en) * | 2015-10-20 | 2016-03-30 | 苏州金华润泽能源有限公司 | LNG is from pressure boost device of unloading |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106764426A (en) * | 2016-11-17 | 2017-05-31 | 内蒙古大唐国际克什克腾煤制天然气有限责任公司 | A kind of Propylene Spherical Tanks with flood pattern |
| CN110081308A (en) * | 2019-05-30 | 2019-08-02 | 河南查瑞特种设备有限公司 | A kind of LNG unloading unit convenient for taking |
| CN111828835A (en) * | 2020-06-22 | 2020-10-27 | 王宝贵 | Method for setting automatic pressure increasing valve of low-temperature liquefied gas storage tank |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105927852B (en) | 2018-01-09 |
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