摘要:
The invention is directed to a method for calculating the remaining usage time of a gas cylinder equipped with a pressure reducer, the method comprising the following steps: (a) measuring the pressure of the gas in the cylinder; (b) calculating the variation of pressure of the gas in the cylinder over time while gas is outputted; (c) calculating a remaining usage time Tr based on the measured pressure in the cylinder and the calculated variation of pressure. Step (c) takes into account characteristics of the pressure reducer relative to variations of its nominal flow rate along the decrease of its inlet pressure while emptying the cylinder.
摘要:
A pressure vessel refuelling system enables fast fill refuelling of CNG fuel tanks by inducing a stratification of gas temperatures inside a tank during refuelling, then re-cycling a portion of the relatively warmer gas out of the tank during refuelling and back to a gas chiller. The system includes a pressure vessel having a lower end, a first gas port and a second gas port, wherein the second gas port is positioned above the lower end of the pressure vessel; and a cooling circuit connecting the first gas port with the second gas port; whereby gas flowing from an interior cavity of the pressure vessel through the second gas port is cooled in the cooling circuit before returning to the pressure vessel through the first gas port; and whereby a temperature of gas inside the pressure vessel varies from a first temperature at a level of the lower end of the pressure vessel to a second temperature, which is higher than the first temperature, at a level of the second gas port.
摘要:
The invention relates to a method of operating a regasification terminal, comprising: a) obtaining a re-gas stream (10) of LNG from one or more LNG storage tanks (1), b) passing the re-gas stream (10) through a regasifier unit (20), c) receiving a feed stream (40) of pressurized LNG, d) generating a cooling stream (11) comprising at least a portion of the re-gas stream (10), e) processing the feed stream (40) of pressurized LNG at the second pressure into a processed feed stream (43) comprising LNG by expanding the feed stream (40) and cooling the feed stream (40) against the cooling stream (11), f) passing the processed feed stream (43) to at least one of the LNG storage tanks (1).
摘要:
Station for dispensing natural gas, which comprises a source of natural gas (2) in the form of compressed gas or in the form of cooled liquid, a dispensing column (dispenser) (3) of such natural gas and feed means (4), which are hydraulically connected to the source of natural gas (2) and to the dispenser (3) in order to send the natural gas from the source to the latter. The dispenser (3) comprises at least one suction hood (100), positioned above the ground level, provided with a suction opening (101), susceptible of collecting natural gas dispersed in the environment, and with at least one expulsion opening (102) for evacuating the collected gas safely. The relevant engagement seat (30) of the gas dispensing head (5) is arranged below the suction opening (101) of the hood (100). The latter is exposed to an air flow, forced or natural, which crosses the relevant mechanical and/or electrical components controlling the gas flow to the heads (5), so as to safely evacuate possible leaks thereof.
摘要:
In a high pressure gas container with a container body having a fusible plug valve and a boss portion arranged at a position different from the fusible plug valve, each of the fusible plug valve and the boss portion has a higher heat conductivity than the container body, the fusible plug valve and the boss portion are connected by a heat conductor and the heat conductor is accommodated in the container body.
摘要:
A pressure vessel refueling system enables fast refueling of Compressed Natural Gas (CNG) fuel tanks. The system includes a pressure vessel having a gas inlet/outlet port and a liquid inlet/outlet port; a first liquid at least partially filling the pressure vessel; a liquid layer of a second liquid floating on top of the first liquid, wherein the second liquid is immiscible with the first liquid; a gas at least partially filling the pressure vessel above the liquid layer of the second liquid, the gas in fluid communication with the gas inlet/outlet; and a pump in fluid communication with the liquid inlet/outlet of the pressure vessel, whereby the first liquid can be pumped or returned to/from storage into or out of the pressure vessel.
摘要:
A system for the production of LNG from low-pressure feed gas sources, at small production scales and at lower energy input costs. A system for the small-scale production of cold compressed natural gas (CCNG). A method of dispensing natural gas from stored CCNG, comprising: dispensing CCNG from a CCNG storage tank; pumping the CCNG by a cryogenic liquid pump to a pressure suitable for compressed natural gas dispensing and storage in on-vehicle compressed natural gas storage tanks; recovering cold from the CCNG by heat exchange with natural gas feeding the natural gas production plant to replace dispensed product. A system for the storage, transport, and dispensing of natural gas, comprising: means for handling natural gas in a CCNG state where the natural gas is a non-liquid, but is dense-enough to allow for pumping to pressure by a cryogenic liquid pump.
摘要:
The invention relates to a method for determining a tank pressure (12) in a tank (5) before the tank (5) is filled with pressurised, gaseous hydrogen, according to which method an accumulator (1), in which the hydrogen to be used to fill the tank is stored as liquid hydrogen, is connected to the tank (5) by means of a filling line (2) and a subsequent check valve (4) of the tank (5), wherein hydrogen is pumped from the accumulator (1) into the filling line (2) by means of a pump (3) and the filling-line pressure (11) arising in the filling line (2) during the pumping is measured, wherein the check valve (4) is opened if the filling-line pressure (11) exceeds the tank pressure (12), and wherein the tank pressure (12) is determined as the filling-line pressure (11) that exists when the check valve (4) is opened.
摘要:
In a gas supply system, a control portion acquires a first temperature and a first pressure of a gas in a fuel tank, and a first output signal value of a pressure sensor corresponding to the first pressure before gas supply, acquires a first amount of the gas in the fuel tank using a fuel tank volume, the first temperature, and the first pressure, acquires a second amount after gas supply, through integration of a measurement value obtained by a flowmeter during gas supply, acquires a second temperature, a second pressure, and a second output signal value corresponding to the second pressure after gas supply, calculates a third pressure using the fuel tank volume, the second amount, and the second temperature, and corrects a relationship between an output signal and the pressure using the first pressure, the first output signal value, the third pressure, and the second output signal value.