Cold utilization system, energy system provided with cold utilization system, and method for utilizing cold utilization system
A technology of cold energy and cold heat exchange, applied to container discharge methods, mechanical equipment, fixed-capacity gas storage tanks, etc.
Inactive Publication Date: 2017-02-22
多田雅史
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Problems solved by technology
Most of the cold energy is not recovered, and thus is wasted in an unused state
Method used
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[0043] Hereinafter, an embodiment in which the present invention is embodied in a cooling power generation system will be described with reference to the drawings. First, use figure 1 , to describe the overall configuration of the cold energy power generation system. The cold energy power generation system uses cold energy of liquefied natural gas (LNG) stored in the storage tank 10 to generate electricity. In this embodiment, an example is shown in which a cold power generation system is applied to a gasification device that vaporizes liquefied natural gas stored in the storage tank 10 and outputs it to the outside as natural gas (NG).
[0044] As shown in the figure, the liquefied natural gas stored in the storage tank 10 is boosted by a primary pump (Primary Pump) 11 and supplied to a secondary pump (Secondary Pump) 12 . The supplied liquefied natural gas is further pressurized by the secondary pump 12 . The liquefied natural gas pressurized by the secondary pump 12 is ...
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The present invention provides a cold utilization system in which the efficiency of utilizing the cold energy of liquefied gas can be improved while gas delivery pressure in the outlet side of a secondary expansion turbine, which is the supercritical-pressure power generation (LSG) of a cryogenic fluid, is freely controlled. The LSG is provided with a pressure-increasing pump for increasing the pressure of a low-temperature liquefied gas to a prescribed pressure equal to or greater than the critical pressure thereof while the liquefied gas remains in liquid form, a Rankine-cycle primary power generation device, and a direct-expansion secondary power generation device. To effectively utilize the cold energy of the liquefied gas, it is more efficient to utilize the cold energy as pressure energy than as temperature energy. The LSG, which is for converting cold energy more dominantly to pressure energy, can determine optimal operating conditions that will yield the highest conversion efficiency, according to the composition of the liquefied gas, the temperature of the heating source, and the gas delivery pressure. In a case of maximum power generation with a low gas delivery pressure, as one example, the power generation intensity is approximately 486 (kJ / kg) (135 (kWh / ton)) in values corrected for actual machinery, and an equivalent of approximately 54% of the cold energy can be recovered as electric power.
Description
technical field [0001] The present invention relates to a cold energy utilization system utilizing cold energy of low-temperature liquefied gas stored in a storage tank, an energy system equipped with the cold energy utilization system, and a utilization method of the cold energy utilization system. Background technique [0002] As the cryogenic liquefied gas, for example, liquefied natural gas (LNG) is known. Liquefied natural gas is obtained by cooling and liquefying natural gas (NG) produced in foreign countries using electricity. Liquefied natural gas, which undergoes liquefaction to reduce its volume, is imported via LNG carrier tankers. Liquefied natural gas is usually gasified at the point of import using an open-frame gasifier or the like. At this time, by exchanging heat between the liquefied natural gas and seawater, the cold energy of the liquefied natural gas is discarded in the seawater. It should be noted, Figure 15 shows the results of estimating the cold ...
Claims
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IPC IPC(8): F01K23/04F01K9/00F01K25/10F17C9/04
CPCF01K9/00F01K23/04F01K25/10Y02E20/16F17C7/04F17C2221/033F17C2223/0161F17C2225/0123F17C2225/035F17C2227/0135F17C2227/0178F17C2227/0316F17C2227/0318F17C2227/0393F17C2265/06F17C2265/07F17C9/04F02C1/02
Inventor 多田雅史
Owner 多田雅史