| 摘要 |
<p>In a method of and apparatus for, cooling a hydrocarbon stream, a hydrocarbon stream (45) to be cooled is heat exchanged in a first heat exchanger (50) against at least one refrigerant stream (145b, 185b) having a first refrigerant stream flow rate (FR1), to provide a cooled hydrocarbon stream (55) having a cooled hydrocarbon stream flow rate (FR2) and at least one return refrigerant stream (105). The first refrigerant stream flow rate (FR1) and the cooled hydrocarbon stream flow rate (FR2) are adjusted as follows, until an inputted first set point (SP1) for the first refrigerant stream flow rate (FR1) is achieved. If the first set point (SP 1) is greater than the first refrigerant stream flow rate (FR1), then the cooled hydrocarbon stream flow rate (FR2) is increased before the first refrigerant stream flow rate (FR1) is increased; if the first set point (SP1) is less than the first refrigerant stream flow rate (FR1), then the first refrigerant stream flow rate (FR1) is decreased before the cooled hydrocarbon stream flow rate (FR2) is decreased; and if the cooled hydrocarbon stream flow rate (FR2) decreases, then the first refrigerant stream flow rate (FR1) is decreased.</p> |
