METHOD AND APPARATUS FOR INCREASING THE EFFICIENCY OF ELECTRIC POWER GENERATING PLANTS

1,213,112. Gas turbine plant; power plant. W.J. LANG. Jan.23, 1969 [Feb.14, 1968; March 20, 1968], No.3861/69. Headings F1G and F1Q. [Also in Division F4] In an electricity generating plant energy is stored during periods of low electrical load requirement by compressing gas by means of electric pow...

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Bibliographische Detailangaben
1. Verfasser:	WILLIAM JOSEPH LANG
Format:	Patent
Sprache:	eng
Schlagworte:	AIR INTAKES FOR JET-PROPULSION PLANTS BLASTING CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER COMBUSTION ENGINES CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ELECTRICITY ENGINE PLANTS IN GENERAL ENGINE PLANTS NOT OTHERWISE PROVIDED FOR ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES FIXED CONSTRUCTIONS GAS-TURBINE PLANTS GENERATION HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINES OR ENGINES FOR LIQUIDS MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOTOTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISEPROVIDED FOR MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR PRODUCING MECHANICAL POWER SPRING, WEIGHT, INERTIA OR LIKE MOTORS STEAM ACCUMULATORS STEAM ENGINE PLANTS STEAM ENGINES SYSTEMS FOR STORING ELECTRIC ENERGY WEAPONS WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS
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Zusammenfassung:	1,213,112. Gas turbine plant; power plant. W.J. LANG. Jan.23, 1969 [Feb.14, 1968; March 20, 1968], No.3861/69. Headings F1G and F1Q. [Also in Division F4] In an electricity generating plant energy is stored during periods of low electrical load requirement by compressing gas by means of electric power and storing the gas under hydrostatic pressure in a subterranean reservoir, the gas being withdrawn to drive a prime mover to generate electricity during periods of high electrical load requirement, the hydrostatic pressure remaining substantially constant. The gas may be air, carbon dioxide or natural gas, or a gas such as LPG which becomes liquid under pressure. In one embodiment, Fig. 1, the subterranean reservoir is formed by an aquifer bounded by impermeable caprock, compressed air being forced down a shaft 5 into the aquifer by an electrically driven compressor 11 during periods of low load and being withdrawn through a shaft 7 under pressure of the displaced water to drive a turbine 13 and generator 15 during periods of high load requirement. The displaced water maintains the air pressure substantially constant. In a modification, Fig. 2 (not shown), shafts 5, 7 are replaced by a single shaft (16) connected at ground level to a reversible screw type compressor-turbine and motor-generator unit. In a further modification, several aquifer reservoirs are used, the air being stored under low hydrostatic pressure in one reservoir and then being compressed and stored under higher hydrostatic pressure in a second reservoir before being withdrawn, when required, to drive the turbine. The expanded air is returned to the low-pressure reservoir. In a further arrangement, Fig. 3, the air reservoir is formed by a man-made cavity in impermeable rock or salt 25, the hydrostatic pressure on the compressed air being provided by a water pipe 27 passing through the air shaft 26 and connected to a ground level water reservoir 29. The storage plant may supplement the output of a main hydroelectric, steam or diesel driven generating plant.