US 2392783 A
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Description (OCR text may contain errors)
` Jan. 8, 1946.
S. S. STEVENS GAS COMPRESSOR STATION File/d June 14,A
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IN VEN TOR. .Samuel 5. Sievens.
`Patented Jan. 8, 1946 GAS COMPRESSOR STATION Samuel S. Stevens, Brookline, Mass., assigner to B. F. Sturtevant Company, Boston, Mass.
Application June 14, 1944, Serial No. 540,251 3 Claims. (Cl. 62-136) This invention relates-to natural gas supply systems and has as an object the recovery of en- 'dred pounds per square inch, this pressure to be increased by the compressor to say, four hundred `and nity pounds per square inch. The gas engine however, cannot operate at a gas supply pressure of two hundred pounds, so it is usual to drop the pressure to about one pound through a pressure reducing valve. The energy released in the pressure reduction is lost.
This invention provides for utilizing the energy released in reducing the pressure'of the gas for supplying refrigeration andvpower and will now be described with reference to the drawing which illustrates diagrammatically one embodiment of the invention.
The compressor 5 driven by the gas engine 6 increases the pressure oi the gas in the natural gas main 1. Gas from the main `I is supplied' through the pipe 8 into the gas turbine 9.' The gas has its pressure reduced in the turbine and its temperature is lowered thereby. The cold gas from the outlet oi the turbine, passes through the shell and tube type heat exchanger i in indirect contact with the gas compressed by the compressor and partially cools the compressed gas. It then passes through the pipe Il submerged in water in the water cooler I2, and then through the pipe I3 into the gas inlet of the eugine 8.
been described for the purpose o'I` illustration, it should be understood that the invention is not limited to the exact apparatus and arrangement of apparatus illustrated, as modiilcations thereof may be suggested by those skilled in the art Without departure from the essence of the invention.
What is claimed is:
1. In a gas compressor station having a high pressure gas main, an internal combustion engine requiring low pressure gas for fuel. the combination of a gas expansion engine, means for supplying gas from said main into the inlet ot said expansion engine. a water cooler, means for passing the gas from Ithe outlet oi said expansion engine in indirect contact with the water in said cooler and then into the gas inlet of said internal combustion engine, and means for recirculating the jacket water of said internal combustion engine through said cooler.
2. In a gas compressor station having a high pressure gas main, a gas compressor for. compressing the gas flowing through said main, and an internal combustion engine driving said compressor, said engine requiring low 'pressure gas for fuel, the combination oi a gas expansion engine, means tor supplying gas from said main into the inlet of said expansion engine, a heat'l exchanger, a water coor, means for recirculating the jacket water o said internal combustion engine through said cooler, means for passing the compressed gas from said compressor through said exchanger, and means for passing -the gas from the outlet or said expansion engine through said exchanger in indirect contact with the gas from said compressor, then through saidcooler in indirect contact with thewater therein and then into 'the gas inlet'oi said internal combustion The turbine performs three functions. ItV low- I ers the pressure of the gas from the main 1 to that required by the gas engine 6. In lowering the pressure. the gas is expanded and cooled and the cold gas used for cooling the gas compressed byv the compressor and for cooling the jacket water The turbine 9 may be a single. or multiple stage `engine.
said internal combustion engine, means including a pump for recirculating the jacket water o! said internal combustion engine through said cooler,
electric generator driven by said expansion turbine depending upon the pressure reduction required. It a multiple stage turbine, gas for cooling may be `taken oi! between stages.
While one embodiment ci the Vinvention has engine, and an electric motor connected electrically to said generator and connected mechant cally tosaid pump for driving saidpumpthrough electric energy derived from said generator.
.Y K. .SAMUEL STEVENS.