EP0878659A2 - System für die Druckgasverteilung - Google Patents

System für die Druckgasverteilung Download PDF

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Publication number
EP0878659A2
EP0878659A2 EP97830581A EP97830581A EP0878659A2 EP 0878659 A2 EP0878659 A2 EP 0878659A2 EP 97830581 A EP97830581 A EP 97830581A EP 97830581 A EP97830581 A EP 97830581A EP 0878659 A2 EP0878659 A2 EP 0878659A2
Authority
EP
European Patent Office
Prior art keywords
gas
cylinders
distribution
compression station
under pressure
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.)
Withdrawn
Application number
EP97830581A
Other languages
English (en)
French (fr)
Other versions
EP0878659A3 (de
Inventor
Franco Zanarini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SAFE Srl
Original Assignee
SAFE Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SAFE Srl filed Critical SAFE Srl
Publication of EP0878659A2 publication Critical patent/EP0878659A2/de
Publication of EP0878659A3 publication Critical patent/EP0878659A3/de
Withdrawn legal-status Critical Current

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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
    • 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
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed 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
    • 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
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • 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
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/036—Very high pressure, i.e. above 80 bars
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • 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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0134—Applications for fluid transport or storage placed above the ground
    • F17C2270/0139—Fuel stations

Definitions

  • the present invention relates to a system for the distribution of gas under pressure.
  • Systems of this kind are used, for example, at motor vehicle gas refuelling stations.
  • the gas coming in from the mains must be compressed to a pressure suitable for filling the gas storage tanks and the motor vehicles.
  • gas supply systems are equipped with a first compression station with a compressor which receives incoming gas at mains pressure (of just a few BAR) and compresses it to a considerably higher pressure (of a few hundred BAR).
  • the compressed gas is usually stored in one or more tanks and subsequently used to refuel motor vehicles.
  • the gas is kept at a pressure suitable for filling the motor vehicle tanks.
  • booster is a supplementary compressor which draws gas at a high pressure (that is, downstream of the compression station and of the storage tanks) so as to keep the pressure at the gas pumps at a sufficiently high level.
  • customary distribution systems consist essentially of a first compression station, one or more storage tanks and a second compression station (the booster) located downstream of the first compression station and connected to the pumps that supply gas to the motor vehicles.
  • the gas compression means occupy a considerable amount of space because two compression stations, two motors, two casings and so on, are required.
  • the second compression station usually consists of a single- (or, in some cases, double-) cylinder compressor driven by a hydraulic unit, that is, a relatively "slow" machine characterized by a low number of cycles per unit time. That means the pressure of the compressed gas cannot be maintained at a constant level at all times.
  • a booster with a single cylinder (or with two cylinders) especially if driven by a hydraulic unit, it is difficult to guarantee a constant supply pressure, particularly when the gas demand from the gas pumps is very high.
  • the aim of the present invention is to overcome the disadvantages just mentioned by providing a gas distribution system where the two compression stations are combined in a single block, that is to say, are driven by the same motor and housed in a single casing.
  • the invention essentially envisages a single casing to house a compressor, preferably a mechanical, reciprocating compressor with cylinders in star-shaped arrangement and connected to each other in such a way as to form two separate compressors constituting the first and second compression stations.
  • One advantage of the present invention is that the system occupies considerably less space than conventional systems used for the same purpose.
  • the second compression station may consist of a plurality of cylinders. This feature improves gas flow control both in terms of the quantity of gas passing through the system and constancy of the flow rate.
  • the second compression station may consist of a plurality of cylinders whose delivery ends are connected, independently of each other, to different motor vehicles.
  • the second compression station may consist of a plurality of cylinders whose intake ends are connected, independently of each other, to different storage tanks. That means that when many motor vehicles draw gas from the same storage tank, the second compression station can be connected mainly to that tank.
  • the cylinders of the second compression station may also be connected with their delivery ends to different storage tanks independently of each other.
  • the system may comprise a single casing that houses a plurality of cylinders that may be connected to each other in series or in parallel in different, selectable combinations that form the two compression stations.
  • the two compression stations may therefore include a variable number of cylinders arranged differently, depending on the selected combination.
  • a system for the distribution of gas under pressure made in accordance with the present invention can be used to supply gas at a certain pressure P2, for example, a value equal to (or lower than) the pressure used for filling mobile tanks, that is to say, tanks with which motor vehicles are equipped.
  • this type of system comprises a first compression station designed to compress the gas from an original pressure P0 (for example, the pressure of the gas mains, labelled 14 in Fig. 1) to a second value P1 that may or may not be the same as the said filling pressure P2.
  • a second compression station (or booster) S2 is also envisaged to operate in combination with or to alternate with the first compression station (S1), by drawing gas at pressure P1 (a variable value) and recompressing it into the motor vehicles at the filling pressure.
  • the first compression station S1 compresses the gas, drawn at mains pressure, to a certain value which may be the same as the motor vehicle filling pressure or different from it, for example, lower, and stores it in one or more storage tanks.
  • the gas is then drawn from the storage tanks and further modified by the compression station S2 whose delivery end is connected directly or through dampening tanks to filler pumps, illustrated schematically by the blocks labelled 13 as a whole.
  • the present invention envisages, to good advantage, that the first compression station S1 and the second compression station S2 form part of a single compressor unit driven by a single motor and mounted in a single casing.
  • the single compressor unit may consist of a star compressor 1, of the mechanical, reciprocating type equipped with a first set of cylinders (2, 3, 4 in the preferred embodiment illustrated) forming the first compression station S1 and a second set of cylinders (5, 6, 7 in the preferred embodiment illustrated) forming the second compression station S2.
  • the gas drawn from the mains 14 where its pressure is P0 passes through a filter 8 and a pulsation dampening 9 to reach a first cylinder 2. It then passes through customary cooling means R1 to reach the second cylinder 3. From the second cylinder 3, still cooled by cooling means R1, similar to the previous ones, the gas reaches a third cylinder 4 and from there, passing through cooling means R1, it reaches a pipe 15 leading into the storage tank 10, where the gas is kept at the second pressure P1 whose value varies according to the demand.
  • the value of pressure P1 may be less than or equal to the pressure P2 at which the refuelling pumps fill the gas into the motor vehicles.
  • the casing of the compressor unit 1 also includes the second set of three cylinders 5, 6 and 7, driven by the same motor as the first set.
  • the three cylinders 5, 6 and 7 are connected to each other in parallel and have independent actuation means to control them in such a way that they form the second compression station S2.
  • the intake ends of the cylinders 5, 6 and 7 can be connected to a storage tank 10.
  • the gas drawn from this tank and subjected to the action of the second compression station S2 is used to fill the motor vehicle tanks through appropriate refuelling means 13 (namely, 13, 13', 13'', 13'''), dampening tanks, which are not illustrated, being fitted if necessary.
  • refuelling means 13 namely, 13, 13', 13'', 13'''
  • dampening tanks which are not illustrated, being fitted if necessary.
  • R2 also at the delivery ends of the second set of cylinders.
  • the system has three storage tanks, namely, the tanks 10, 11 and 12.
  • the various different components of the system namely, the two compression stations S1 and S2, the storage tanks 10, 11 and 12 and the gas pumps 13, 13', 13'', 13''' can be connected in different ways, as described below.
  • the first compression station S1 can be connected at its delivery end to the three storage tanks 10, 11 and 12 through corresponding pipes 26, 27 and 28.
  • the pressure at which the tanks will be filled by the first compression station will depend on the delivery specifications of the station itself.
  • the cylinders of the second set 5, 6 and 7 are also equipped with independent means for connecting their intake ends to one or more storage tanks.
  • the system may have medium- and high-pressure storage tanks or low-, medium- and high-pressure storage tanks, as in the embodiment illustrated, or any other number of storage tanks.
  • the second compression station S2 may be connected to the three storage tanks at its delivery end as well as at its intake end.
  • gas flow deflection means schematically represented by block 17, may be envisaged to create a two-way connection between the cylinders 5, 6 and 7 and the pipes 19, 20 and 21 which lead into the tanks 10, 11, and 12.
  • each single cylinder can be connected to the second compression station S2 independently of the others, the system can be adjusted to the gas demand of the motor vehicles being refuelled.
  • the system operator or the automatic control unit 17 can connect one or more cylinders 5, 6 or 7 of the second compression station S2 to the tank which needs a boost charge.
  • the three cylinders 5, 6 and 7 can be connected at their delivery ends either to a generic, single gas pump 13 or to separate gas pumps 13', 13'' and 13''' or even to the storage tanks 10, 11 and 12. At the intake end, the three cylinders 5, 6 and 7 can be connected to one or more of the storage tanks 10, 11 and 12.
  • control unit 16 designed to deflect the gas flow from the cylinders 5, 6, 7 to the gas pumps 13', 13'' and 13''', respectively, through the related pipes 23, 24 and 25.
  • Delivery to the tanks 10, 11 and 12 and intake from the same are controlled by the control unit 17, in combination with the control unit 18 (which drives delivery from the first compression station S1 to the storage tanks) and which is connected to the said control unit 16 and to the pipes 19, 20 and 21 which lead into the tanks 10, 11 and 12.
  • all the cylinders mounted in the casing can be connected to each other in different ways to form compression stations of different shapes and sizes.
  • two cylinders for example, those labelled 2 and 3 might form the first compression station S1 and the remaining four (those labelled 4, 5, 6 and 7) the second compression station S2.
  • the different combinations of cylinders can be created manually by an operator or automatically by appropriate control means C, also represented by a function block connected by a dashed line to the different components of the system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Pipeline Systems (AREA)
EP97830581A 1997-05-13 1997-11-10 System für die Druckgasverteilung Withdrawn EP0878659A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO970290 1997-05-13
IT97BO000290A IT1292920B1 (it) 1997-05-13 1997-05-13 Impianto per la distribuzione di gas in pressione.

Publications (2)

Publication Number Publication Date
EP0878659A2 true EP0878659A2 (de) 1998-11-18
EP0878659A3 EP0878659A3 (de) 1999-05-26

Family

ID=11342266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97830581A Withdrawn EP0878659A3 (de) 1997-05-13 1997-11-10 System für die Druckgasverteilung

Country Status (2)

Country Link
EP (1) EP0878659A3 (de)
IT (1) IT1292920B1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH671610A5 (de) * 1986-11-14 1989-09-15 Sulzer Ag
US5385176A (en) * 1993-07-19 1995-01-31 Price Compressor Company, Inc. Natural gas dispensing
US5370159A (en) * 1993-07-19 1994-12-06 Price Compressor Company, Inc. Apparatus and process for fast filling with natural gas

Also Published As

Publication number Publication date
IT1292920B1 (it) 1999-02-11
ITBO970290A1 (it) 1998-11-13
ITBO970290A0 (it) 1997-05-13
EP0878659A3 (de) 1999-05-26

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