CN106122768B - The method that air in more spherical tanks is replaced in disposable series connection - Google Patents
The method that air in more spherical tanks is replaced in disposable series connection Download PDFInfo
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- CN106122768B CN106122768B CN201610476168.9A CN201610476168A CN106122768B CN 106122768 B CN106122768 B CN 106122768B CN 201610476168 A CN201610476168 A CN 201610476168A CN 106122768 B CN106122768 B CN 106122768B
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- spherical tank
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- 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
- F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
-
- 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
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0128—Shape spherical or elliptical
-
- 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
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/05—Size
- F17C2201/052—Size large (>1000 m3)
-
- 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
- F17C2205/01—Mounting arrangements
- F17C2205/0123—Mounting arrangements characterised by number of vessels
- F17C2205/013—Two or more vessels
- F17C2205/0134—Two or more vessels characterised by the presence of fluid connection between vessels
- F17C2205/0138—Two or more vessels characterised by the presence of fluid connection between vessels bundled in series
-
- 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
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/04—Reducing risks and environmental impact
- F17C2260/042—Reducing risk of explosion
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a kind of methods of air in more spherical tanks of displacement, the exhaust pipe of front spherical tank and the air inlet pipe of rear adjacent spherical tank are sequentially communicated by this method, the air inlet pipe of first spherical tank is connected to Nitrogen source gases, using the method for series connection displacement, since first spherical tank pressurized displacement, nitrogen is discharged from first spherical tank is entered to from the last one spherical tank, gradually the air in each spherical tank is discharged from the top of the last one spherical tank, nitrogen is playing always metathesis in entire replacement process, the air in the spherical tank of front is rushed in subsequent spherical tank successively, there is no outer row to waste, greatly reduce the usage amount of nitrogen；On the other hand, at the same time into line replacement, the time of displacement is substantially shorter multiple spherical tanks.Man power and material can be greatlyd save, displacement expense is substantially reduced, so that spherical tank is gone into operation in advance and generate economic benefit.
Description
Technical field
The present invention relates to a kind of Natural Gas Sphericals, and in particular to a kind of preceding side for replacing its interior air of spherical tank operation operation
Method.
Background technology
General natural gas distribution station is equipped with the larger sub-high pressure large-size spherical tank of multiple volumes, by the parallel connection of multiple spherical tanks
Or series connection is supplied to air delivering pipeline, also individually can externally supply each spherical tank.Spherical tank is gone into operation before operation, is full of in tank body
Air, so natural gas can be just filled with after the air in it must being cemented out.
Current substitute mode has atmospheric pressure Diluted replacement, pressurized displacement method, Evacuated replacement and water displacement method.
Atmospheric pressure Diluted replacement be by nitrogen from spherical tank lower end enter, by spherical tank air or other gas quilts
In displacement to the air of the other end.System is mainly purged at atmosheric pressure.Its nitrogen consuming amount is replaced to tun
By up to the 800 of volume times or more, and take speciality.
Pressurized displacement method is that nitrogen is added from spherical tank lower part, so that the pressure in spherical tank is raised to certain definite value, waits for gas mixing
Afterwards from the top discharge to air of spherical tank.Reach displacement afterwards several times using cycle pressurization to require, cycle pressurization number is by purpose
Concentration determines.The spherical tank that industry requirement replaces 5000 cubic metres of volume with nitrogen is such as pressed, using being forced into gauge pressure two every time
Kilogram, pressurized displacement just reaches Eligibility requirements three times, that is, oxygen content is less than 1% in the gas after replacing, but need to consume nitrogen about
The cubical content of ten times of spherical tanks, taking needs five days or so.
Evacuated replacement is only adapted to small container.
Water displacement method is not suitable for the displacement of ground spherical tank because considering load-bearing requirements.
Invention content
It can once replace the method for air in multiple spherical tanks the purpose of the present invention is to provide a kind of and shorten time swap
With saving nitrogen use level, the operation expense of spherical tank is saved.
A kind of this method for replacing air in more spherical tanks disclosed by the invention, includes the following steps：
（1）, the air inlet pipe of the exhaust pipe of each Spherical Tank follow-up Spherical Tank adjacent thereto is connected to, and by each spherical tank
Air inlet pipe and exhaust pipe on inlet valve and outlet valve be turned off, connect pressure before the exhaust pipe upper outlet valve of each spherical tank
Table and diffusion valve, pipe, the top connection diffusion valve of each spherical tank are managed, and pressure gauge is connected on the pipeline before the diffusion valve；
（2）, open first spherical tank inlet valve, nitrogen is inputted in the spherical tank, when the gauge pressure of the spherical tank is shown as setting
The input for stopping nitrogen when evaluation, simultaneously closes off the ball valve in air inlet pipe；
（3）, wait for nitrogen in first spherical tank and air after mixing（Stand-by period is big according to gas molecule fugacity
Small time estimation value, about 10-15 minutes）The outlet valve for opening first spherical tank pressurizes to second spherical tank, until two
The outlet valve of first spherical tank is closed when the gage pressure readings of spherical tank are consistent；
（4）, open the inlet valve of first spherical tank, continue to input nitrogen into first spherical tank, when first spherical tank
The outlet valve that gauge pressure is shown as opening after design value first spherical tank continues to pressurize to second spherical tank；
（5）Stop pressurizeing to first spherical tank when the gauge pressure of second spherical tank is shown as design value, closes first ball
The inlet valve and outlet valve of tank；
（6）, wait for that nitrogen in second spherical tank and air are uniformly mixed（Stand-by period is according to gas molecule fugacity size
Time estimation value, about 10-15 minutes）The outlet valve for opening the spherical tank afterwards gives the pressurization of third spherical tank, until second and the
When the gage pressure readings of 3 two spherical tanks are consistent, opening the outlet valve of first spherical tank makes first spherical tank release；
（7）, when the gage pressure readings of aforementioned three spherical tanks are consistent, close going out for second spherical tank and first spherical tank successively
Mouth valve；
（8）, be repeated in step 2）、（3）、（4）、（5）、（6）, until the gauge pressure of third spherical tank is shown as design value
When, stop pressurizeing to first spherical tank, and close the outlet valve of second spherical tank and first spherical tank successively；
（9）, wait for nitrogen in third spherical tank and air after mixing（Stand-by period is big according to gas molecule fugacity
Small time estimation value, about 10-15 minutes）, the outlet valve for opening third spherical tank pressurizes to the 4th spherical tank, when third with
When the gage pressure readings of 4th spherical tank are consistent, the outlet valve release of second spherical tank is opened, when the gauge pressure of second and third and four spherical tanks
When readings are consistent open first spherical tank release, when the pressure of four spherical tanks is consistent, successively close third, second and first
The outlet valve of spherical tank；The rest may be inferred, until when the gage pressure readings of the last one spherical tank reach design value, stops to first spherical tank
Pressurization, at the same successively close penultimate, third last ... the outlet valve of spherical tank；
（10）, wait for nitrogen in the last one spherical tank and air after mixing（Stand-by period is to be escaped according to gas molecule
The time estimation value of degree size, about 10-15 minutes）, the desorption tube exit on the exhaust pipe of each spherical tank is detected in spherical tank
Oxygen content in mixed gas is qualification, the nitrogen of multiple spherical tanks when the oxygen content in mixed gas in each spherical tank is less than 1%
Displaced air process terminates.
The exhaust pipe of front and back adjacent Spherical Tank and air inlet pipe are sequentially communicated by the present invention, using the side of pressurization series connection displacement
Method, since first spherical tank pressurized displacement, nitrogen is discharged from first spherical tank is entered to from the last one spherical tank, gradually will be every
Air in a spherical tank is discharged from the top of the last one spherical tank, and nitrogen is playing always metathesis in entire replacement process,
The air in the spherical tank of front is rushed in subsequent spherical tank successively, is wasted without outer row, greatly reduces the usage amount of nitrogen；It is another
Aspect, at the same time into line replacement, the time of displacement is substantially shorter multiple spherical tanks.Man power and material can be greatlyd save, significantly
Displacement expense is reduced, so that spherical tank is gone into operation in advance and generate economic benefit.
In order to ensure the safety of replacement process and smooth, when with nitrogen pressurized operation, it is necessary to spherical tank pressurization in front
The spherical tank pressurization that can give its rear adjacent after to design value；It must can be opened after the completion of the pressure release of this spherical tank when pressure discharge operations
The adjacent spherical tank pressure release in its front, absolute prohibition gas backflow.That is pressurization be to be operated from front to back, pressure release be from
After progress operation.
Description of the drawings
Fig. 1 is each spherical tank connection diagram of one embodiment of the invention.
Specific implementation mode
Present embodiment discloses our company once to replace the sub-high pressure large size ball that four volumes of gas holder station are 5000 cubic metres
The method of tank, due to displacement operation continuous operation, the operating personnel needed are more, so the present embodiment is carried out using daytime
The working method of replacement operator rest at night.
Before progress nitrogen replacement operator starts, pressure gauge will be connected before the exhaust pipe upper outlet valve of each spherical tank and diffused
Valve, pipe；It by the top connection diffusion valve of each spherical tank, manages, pressure gauge is connected on the pipeline before the diffusion valve；By each Spherical Tank
Exhaust pipe follow-up Spherical Tank adjacent thereto air inlet pipe connection, and by the import in the air inlet pipe and exhaust pipe of each spherical tank
Valve and outlet valve are turned off, and the air inlet pipe of first spherical tank is connected to Nitrogen source gases.As shown in Figure 1.
For the safety of operation, the continuous displacement side of not outer denitrogen gas is carried out using gauge pressure 0.3MPa is forced into every time
Method.
Specific replacement operator is as follows：
One morning：Nitrogen is inputted into pressurization from the air inlet pipe of first Spherical Tank, when the Spherical Tank exhaust pipe
The reading of upper pressure gauge is shown as stopping pressurization when 0.3MPa, closes the inlet valve in air inlet pipe.Nitrogen in the spherical tank and sky
Gas about needs could be uniformly mixed for ten minutes（The time is the time estimation value according to gas molecule fugacity size）, after mixing
Gas be discharged into second spherical tank from the exhaust pipe of the spherical tank.
When the pressure in two spherical tanks unanimously after close the outlet valve of first spherical tank, that is, when on two spherical tank exhaust pipes
When gauge pressure is consistent, the outlet valve of first spherical tank is closed.
One afternoon：To first spherical tank input nitrogen pressurization, when the gauge pressure on the spherical tank inside exhaust pipe is shown as
Its outlet valve is opened after 0.3MPa to continue to pressurize to second spherical tank；Stop after the pressure in second spherical tank reaches 0.3MPa
It pressurizes to first spherical tank nitrogen charging, the outlet valve on first spherical tank exhaust pipe is simultaneously closed off, to prevent gas backflow；It waits for about
After ten minutes, the outlet valve opened on second spherical tank exhaust pipe is vented into third spherical tank.
When the gauge pressure on second, third two spherical tank exhaust pipes is consistent, quickly open on first spherical tank exhaust pipe
Outlet valve makes first spherical tank pressure release.
When the pressure equilibrium of gas in the first, second, and third three spherical tanks, second spherical crown and first is closed successively
Outlet valve on a spherical tank exhaust pipe, such closing sequence mainly prevent gas backflow.
Second day：To first spherical tank input nitrogen pressurization, beaten after the gauge pressure on the spherical tank exhaust pipe reaches 0.3MPa
The outlet valve opened on its exhaust pipe pressurizes to second spherical tank；Second spherical tank is opened when second spherical tank pressure reaches definite value
Outlet valve pressurizes to third spherical tank.
Stop pressurization when the gauge pressure on third spherical tank exhaust pipe reaches 0.3MPa, and closes second spherical tank successively and go out
Mouth valve and first spherical tank outlet valve.After ten minutes, opens third spherical tank outlet valve and arrange gaseous mixture to the 4th spherical tank；
When third, the 4th spherical tank pressure mean time open second spherical tank pressure release；
When second and third, four spherical tank pressure mean times open first sub- pressure release of spherical tank；
When the gauge pressure of four spherical tanks is consistent, close successively third, second and first spherical tank outlet valve, to prevent
Only gas backflow.
Third day：To first spherical tank input nitrogen pressurization, it is opened when the gauge pressure of first spherical tank reaches 0.3MPa
Outlet valve pressurizes to second spherical tank；
The outlet valve that the spherical tank is opened when the gauge pressure of second spherical tank is 0.3MPa pressurizes to third spherical tank；
The outlet valve that the spherical tank is opened when the gauge pressure of third spherical tank is 0.3MPa pressurizes to the 4th spherical tank.
Stop pressurizeing to first spherical tank nitrogen charging when the gauge pressure of the 4th spherical tank is 0.3MPa, after about ten minutes, open
Diffusion valve discharge at the top of 4th spherical tank.
When the gauge pressure of the 4th spherical tank is less than 0.05MPa（Micro-positive pressure）When, the outlet valve of third spherical tank is opened to the 4th
A spherical tank exhaust, then diffused by the diffusion valve at the top of the 4th spherical tank；And so on, when the gauge pressure of first spherical tank is less than
0.05MPa（Micro-positive pressure）When, the diffusion valve closed at the top of the 4th spherical tank stops exhaust；Close third, the second and successively simultaneously
The outlet valve of first spherical tank.
The pressure of each spherical tank is checked, if having less than 0.05MPa（Micro-positive pressure）Spherical tank, then appropriate pressurization, it is ensured that each
The pressure of spherical tank is not less than 0.05MPa（Micro-positive pressure）.When in order to avoid evening temperature is too low, spherical tank internal cause gas volume, which shrinks to generate, to be born
It presses and damages internal component.The accident, nearly 300,000 yuan of loss just occurred for 1992 for the former artificial manufactured coal gas plant in Changsha.
4th day：To first spherical tank input nitrogen pressurization, it is opened when the pressure of first spherical tank reaches 0.3MPa
Outlet valve pressurizes to second spherical tank；The rest may be inferred, opened when the pressure of third spherical tank reaches 0.3MPa its outlet valve to
4th spherical tank pressurization.Stop pressurizeing to first spherical tank nitrogen charging when the pressure of the 4th spherical tank reaches 0.3MPa, and successively
Close third, second and first spherical tank outlet valve.
After about ten minutes, the outlet of the diffusion valve, third, second and first spherical tank at the top of the 4th spherical tank is opened successively
Valve exhaust.When the gauge pressure of the 4th spherical tank is close to zero, first starts nitrogen and pressurize to first spherical tank, turn off the 4th ball
The diffusion valve of tank top；When the gauge pressure of the 4th spherical tank reaches 0.05MPa（Micro-positive pressure）When, stop pressurization, and close the successively
Three, the outlet valve of second and first spherical tank ensures spherical tank safety overnight.
5th day：According to four spherical tank pressurizations of switching sequence pair of above-mentioned valve, when the gauge pressure of the 4th spherical tank reaches
Stop pressurization when 0.3MPa.Close successively third, second and first spherical tank outlet valve.
The oxygen content in tank in gas is detected after waiting for about ten minutes, at the sampling on each spherical tank exhaust pipe, is less than 1%
For qualification.
Theoretically pass through above-mentioned nitrogen pressurized displacement process, the oxygen content of gas should be less than 0.1% in first spherical tank；The
The oxygen content of gas is less than 0.8% in two spherical tanks；The oxygen content of gas should be less than 1.5% in third spherical tank；4th ball
The oxygen content of gas should be less than 2.2% in tank；Although oxygen content is higher than 1.0% in third, the 4th spherical tank, but as long as by the first He
Gas in second spherical tank discharges after being staged through third, the 4th spherical tank, and the oxygen content in third and fourth spherical tank can gradually drop
It is low, it checks until qualification.Or a pressurized treatments are carried out to third, the 4th spherical tank, it can also make its oxygen content qualified.Root
Retain for use to prevent negative pressure according to technological requirement, exhaust is diffused again when needing with gas replacement nitrogen.After fuel cartridge displacement
Its interior oxygen content≤1% is professional standard.
When spherical tank is gone into operation, continue to use gas replacement nitrogen, operation sequence identical with nitrogen displaced air.This
Sample, the entire nitrogen displaced air of four spherical tanks, the overall process time of gas replacement nitrogen are no more than 12 days（Daytime is made
Industry is rested at night）.
Because since first spherical tank pressurized displacement, nitrogen, until the 4th spherical tank discharge, gives full play to after entrance
Metathesis of the nitrogen in spherical tank.It is close to save nitrogen for the method that four spherical tanks of the present embodiment pair use series pressurized displacement
20 ten thousand steres are worth 240,000 yuan；Nearly 20 ten thousand stere of natural gas is saved, is worth 500,000 yuan；When accelerating displacement
Between one month, count traffic, personnel's wage, logistics service, coordination expense etc. in, this method is that company saves fund nearly 1,000,000
Member.And be at that time at the bottom of November, temperature is low, and market is peak period with gas, and company's supply gas pressure situation is quite severe.Gas holder station
Four spherical tanks can in time go into operation operation one month earlier at crucial moment, and normally guarantor is provided with gas for corporation guarantee Changsha market
Card.For this purpose, sequencing planning group obtains the special bonus of new holding group difficult to understand.
Gauge pressure design value after first spherical tank pressurization is determined according to the quantity of spherical tank and the displacement number of design.
Claims (1)
1. the method for air, includes the following steps in a kind of more spherical tanks of displacement：
（1）, the air inlet pipe of the exhaust pipe of each Spherical Tank follow-up Spherical Tank adjacent thereto is connected to, and by each spherical tank into
Inlet valve and outlet valve on tracheae and exhaust pipe are turned off, connected before the exhaust pipe upper outlet valve of each spherical tank pressure gauge and
Diffusion valve, pipe, the top connection diffusion valve of each spherical tank are managed, and pressure gauge is connected on the pipeline before the diffusion valve；
（2）, open first spherical tank inlet valve, nitrogen is inputted in the spherical tank, when the gauge pressure of the spherical tank is shown as design value
When stop nitrogen input, simultaneously close off the ball valve in air inlet pipe；
（3）, wait for that nitrogen in first spherical tank and air open the outlet valve of first spherical tank to second ball after mixing
Tank pressurizes, until closing the outlet valve of first spherical tank when the gage pressure readings of two spherical tanks are consistent；
（4）, open first spherical tank inlet valve, continue to input nitrogen into first spherical tank, when the gauge pressure of first spherical tank
The outlet valve for being shown as opening after design value first spherical tank continues to pressurize to second spherical tank；
（5）Stop pressurizeing to first spherical tank when the gauge pressure of second spherical tank is shown as design value, first spherical tank of closing
Inlet valve and outlet valve；
（6）, wait for that nitrogen in second spherical tank and air are opened the outlet valve of the spherical tank and added to third spherical tank after mixing
Pressure, when second is consistent with the gage pressure readings of two spherical tanks of third, opening the outlet valve of first spherical tank makes first spherical tank
Release；
（7）, when the gage pressure readings of aforementioned three spherical tanks are consistent, successively close second spherical tank and first spherical tank outlet
Valve；
（8）, be repeated in step（2）、（3）、（4）、（5）、（6）, until when the gauge pressure of third spherical tank is shown as design value, stop
It only pressurizes to first spherical tank, and closes the outlet valve of second spherical tank and first spherical tank successively；
（9）, wait for nitrogen in third spherical tank and air after mixing, open the outlet valve of third spherical tank to the 4th ball
Tank pressurizes, and when the gage pressure readings of third and fourth spherical tank are consistent, opens the outlet valve release of second spherical tank, when second,
Three open first spherical tank release when consistent with the gage pressure readings of four spherical tanks closes successively when the pressure of four spherical tanks is consistent
The outlet valve of third, second and first spherical tank；The rest may be inferred, until the gage pressure readings of the last one spherical tank reach design value
When, stop pressurizeing to first spherical tank, while close successively penultimate, third last ... the outlet valve of spherical tank；
（10）, wait for nitrogen in the last one spherical tank and air after mixing, the desorption tube on the exhaust pipe of each spherical tank goes out
Oxygen content at mouthful in detection spherical tank in mixed gas is qualification when the oxygen content in mixed gas in each spherical tank is less than 1%,
The nitrogen displaced air process of multiple spherical tanks terminates.
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| CN201610476168.9A CN106122768B (en) | 2016-06-27 | 2016-06-27 | The method that air in more spherical tanks is replaced in disposable series connection |
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| CN201610476168.9A CN106122768B (en) | 2016-06-27 | 2016-06-27 | The method that air in more spherical tanks is replaced in disposable series connection |
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| CN110382944B (en) * | 2017-03-30 | 2021-10-01 | 全耐塑料高级创新研究公司 | Hydrogen storage system |
| CN109022669A (en) * | 2018-08-16 | 2018-12-18 | 邯郸钢铁集团有限责任公司 | A kind of oxygen tank replacing process that can be reduced displacement consumption and reduce time swap |
| JP2021095092A (en) * | 2019-12-19 | 2021-06-24 | 三菱造船株式会社 | Gas replacement method |
| CN115264388B (en) * | 2022-07-13 | 2024-01-30 | 北京市燃气集团有限责任公司 | Device and method for continuously replacing natural gas with nitrogen |
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| JP2000170997A (en) * | 1998-12-04 | 2000-06-23 | Ishikawajima Harima Heavy Ind Co Ltd | Gas replacing method for low temperature liquefied gas tank |
| KR101559404B1 (en) * | 2009-04-02 | 2015-10-13 | 대우조선해양 주식회사 | Replacement apparatus of a liquefied gas storage tank using nitrogen |
| CN104214506B (en) * | 2014-09-10 | 2016-03-30 | 株洲新奥燃气有限公司 | A kind of Natural Gas Spherical displacement apparatus and method of replacing thereof |
| CN104390135B (en) * | 2014-09-29 | 2017-06-27 | 万达集团股份有限公司 | The negative pressure of large-size spherical tank adds inert gas replacement |
| CN104964159B (en) * | 2015-05-29 | 2018-08-17 | 大唐华银电力股份有限公司金竹山火力发电分公司 | The method of replacing of ammonia in a kind of liquid ammonia storage tank |
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