| 摘要 |
Circulating water for a power plant contains clams and other particles that would clog condensor tubes. Four filter units have inlets and outlets connected in parallel to a lake and the power plant, respectively. The parallel connection permits isolation of one unit for servicing while the remaining units filter the circulating water. A selected unit is isolated by blocking the inlet and outlet. A drain is opened, and backwash water is pumped to sprayers in the selected unit. Nozzles on the sprayers direct water at filter screens in the unit to wash clams and other particles collected on the screens to the drain for disposal. While the unit is thus isolated, workmen may open manholes and enter the unit interior for maintenance. The selected unit is placed online by partially opening the unit inlet to fill the unit and purge air through the open vent. When the unit is full, the vent is closed, and the inlet and outlet are fully opened. The filter units are supported by springs mounted to a concrete foundation in order to accommodate flexing of tunnels and filter units due to extremely high fluid flow rates in the units and tunnels.
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