| 摘要 |
<p>The control apparatus (9) makes it possible to obtain a desired quantity of a fluid produced by the system by controlling a "single" valve (3) provided in a secondary line which transports a concentrated liquid discharged from a reverse osmosis device (4). In one embodiment of the invention, the control apparatus is applied to a fresh-water distillation system. Once a desired fresh-water flow rate (Q1) has been set, the control apparatus (9) can automatically determine a necessary valve opening (AV) in accordance with performance characteristics (21 to 28) of components ADa system line between a centrifugal pump (1) and the reverse osmosis device (4) BD of the fresh-water distillation system. In response to this, the valve generates a desired pressure at the inlet of the reverse osmosis device (4). As a result, the reverse osmosis device (4) produces fresh water at a flow rate which is, in practice, equal to the set value (Q1). According to another aspect of the invention, means (36, 38) which minimize the power of the centrifugal pump are provided. According to a third aspect of the invention, monitors (see Figs. 8, 10, 12 and 13) which evaluate the performance of each of the components of the system are also provided. The monitors can be utilized to renew data on the performance of the system which is employed in the control apparatus. </p> |
