Abstract:
Described herein are systems and methods for cryogenic fluid delivery to achieve the lowest reasonable saturation pressure while dispensing a cryogenic fluid such as liquefied natural gas to a holding tank on a use device. The systems and methods utilize a liquid nitrogen component and a liquefaction engine, very cold liquefied natural gas and a liquefaction engine, or a combination of both very cold liquefied natural gas and a liquid nitrogen component to deliver LNG to a holding tank on a use device.
Abstract:
A fuel supply assembly which receives a supply of liquid fuel feedstock including hydrocarbons having higher and lower hydrocarbon content and high molecular weight sulfur-containing compounds, the higher hydrocarbon content and high molecular weight sulfur- containing compounds being less volatile than the lower hydrocarbon content. The fuel supply assembly supplies fuel to a fuel cell assembly, and has a housing unit (201) adapted to house the liquid fuel feedstock to vaporize to form fuel feedstock vapor, the vaporization conditions being such that the concentration of lower hydrocarbon content is higher and the concentration of higher hydrocarbon content and high molecular weight sulfur-containing compounds is lower in the fuel feedstock vapor than in the liquid fuel feedstock. A collecting unit is provided in the fuel supply assembly, which has a first end coupled with the housing unit and a second end adapted to be coupled with the fuel cell assembly, which collects the fuel feedstock vapor from the housing unit to make the vapor available to the fuel cell assembly.
Abstract:
Es wird ein Verfahren zum Bereitstellen von Erdgas, insbesondere von für die Betankung von Fahrzeugen verwendetem Erdgas, beschrieben. Erfindungsgemäß wird dem Erdgas wenigstens eine Komponente, die eine gefrierpunkterniedrigende und/oder zünddruckstabilisierende Wirkung aufweist, beigemischt. Hierbei wird dem Erdgas vorzugsweise Methanol, Ethanol oder ein Gemisch aus Methanol und Ethanol beigemischt. Die beigemischte(n) Komponente(n) liegen vorzugsweise mit einem Gehalt zwischen 1 und 1000 ppm, insbesondere zwischen 5 und 500 ppm im Erdgas vor.
Abstract:
The present invention relates to a method for the regasification of liquefied natural gas, the method at least comprising the steps of: a) removing liquefied natural gas (10) from a storage tank (2) using a first pump unit (3); b) passing the removed liquefied natural gas (20) to and feeding it into a second pump unit (4) at an inlet pressure; c) increasing the pressure of the liquefied natural gas in the second pump unit (4) thereby obtaining pressurized liquefied natural gas (50); d) vaporizing the pressurized liquefied natural gas (50) thereby obtaining gaseous natural gas (60); wherein the second pump unit (4) discharges the pressurized liquefied natural gas (50) at a pre-selected pressure value, regardless of the inlet pressure at the second pump unit (4).
Abstract:
A primary stream of boiled-off natural gas taken from the ullage space (6) of a liquefied natural gas storage vessel (2) is compressed by a compressor (12). A flow of liquefied natural gas taken from the storage vessel (2) is partially and forcedly vaporised in a vaporiser (36) so as to form a secondary stream of natural gas containing unvaporised liquefied natural gas. Unvaporised liquefied natural gas is disengaged from the secondary stream in a phase separator (42). The secondary stream is mixed with the compressed primary stream to form a supply of natural gas fuel. The fuel supply may be formed and used on board an ocean-going LNG tanker.
Abstract:
LNG is pumped to supercritical pressure and vaporized, preferably in an offshore location to thereby form a natural gas stream with an intermediate temperature. A first portion of that stream is then processed in an onshore location to remove at least some non-methane components to thereby form a lean LNG, which is then combined with a second portion of that stream to form a sales gas having desired chemical composition. The intermediate temperature and the split ratio of the gas stream in first and second portion are a function of the concentration of the non-methane components in the LNG.
Abstract:
A system achieving a high density of transported natural gas by compressing it to high pressures typically above 5 MPa to transport the gas in a modified composition that permits a very low compressibility factor at near ambient temperature either above or below. This reduces greatly the size of the cooling systems that are required. In some cases cooling of the compressed gas may be achieved in a simple heat exchanger cooled by air or water. The transport of the gas takes place in self propelled ships or non-self propelled barges fitted with a cargo containment system (34) capable of storing the cargo at high pressures, typically above 5 MPa and usually not above 25 MPa. The transport vessel (30) may carry a store of higher molecular weight gases (c2 through c7) that when mixed with the incoming cargo results in a molecular weight of the mixture of at least 22 and possibly as high as 28.
Abstract:
An inventory management method is also provided. This method includes removing and replacing the gas product from a first salt cavern as supply and demand dictate, analyzing the impurities in the gas product that is removed, predicting the duration until a maximum acceptable impurity limit is present, removing all the working gas from the first salt cavern when the maximum acceptable impurity limit is reached, then replacing the working gas in the first salt cavern, while concurrently, removing and replacing the gas product from a second salt cavern as supply and demand dictate, analyzing the impurities in the gas product that is removed, predicting the duration until a maximum acceptable impurity limit is present, removing all the working gas from the second salt cavern when the maximum acceptable impurity limit is reached, then replacing the working gas in the second salt cavern, while concurrently repeating steps a) - g).