| 摘要 |
A rotary heat exchanger includes an evaporation chamber in which sprayers spray a feed liquid to be purified onto the surfaces of heat-exchange members, which heat it and cause some of it to evaporate. The remaining, un-evaporated feed liquid is collected by a rapidly spinning sump, from which scoops skim the spinning sump liquid and direct it back to the sprayers. To make the rate at which feed liquid is supplied to the heat ex- changer match that at which the sprayed liquid evaporates, a regulator bases its control of a flow-controlling valve's flow resistance on the internal pressure that prevails in one of the scoops.
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