| 摘要 |
989,218. Storing liquefied gases. CONCH INTERNATIONAL METHANE Ltd. March 2, 1964, No. 8700/64. Heading F4P. An underground rock cavern 3 in which is stored liquefied gas e.g. natural methane has a thermally insulated false roof 12 between the normal liquid level and the roof proper 13 from which extends a vertical shaft 4 and the vapour space between roofs 12, 13 is heated so as to maintain the temperature between minus and plus 20‹ C. thereby minimizing roof fracture due to temperature fluctuations. The roof 12 is of sheet aluminium or stainless steel covered with fibre glass, foamed polyvinyl chloride or foamed polyurethane and the vapour space is heated by vapour of the gas being stored. A blower 17 draws from a pipe 22 in the shaft 4 and delivers through a heater 18 into a pipe 19 and through orifices 21 in a header 20. Liquefied gas is discharged by a pump 10 through a pipe 9. In a modification the heated vapour is circulated in a closed system. |
