| 摘要 |
A PROCESS IS DISCLOSED FOR CONVEYING GAS STREAM RICH IN METHANE, SUCH AS NATURAL GAS. IN THE FIRST STEP OF THE PROCESS, GAS IS SUPPLIED TO A PIPELINE AT AN ENTRY PRESSURE THAT IS SUBSTANTIALLY HIGHER THAN THE OUTPUT PRESSURE OF THE PIPELINE. THE DROP IN PRESSURE IN THE PIPELINE CAUSES A LOWERING OF THE GAS TEMPERATURE, PREFERABLY TO A TEMPERATURE BELOW ABOUT -29°C. (-20°F.). THE ENTRY PRESSURE OF THE GAS TO THE PIPELINE IS CONTROLLED TO ACHIEVE A PREDETERMINED OUTPUT PRESSURE OF THE GAS FROM THE PIPELINE. OUTPUT GAS FROM THE PIPELINE IS THEN LIQUEFIED TO PRODUCE LIQUEFIED GAS HAVING A TEMPERATURE ABOVE ABOUT -112°C. (-170°F.) AND A PRESSURE SUFFICIENT FOR THE LIQUID TO BE AT OR BELOW ITS BUBBLE POINT TEMPERATURE. THE PRESSURIZED LIQUEFIED GAS IS THEN FURTHER TRANSPORTED IN A SUITABLE CONTAINER. (
|
