Air ejector vacuum control valve
AssigneePacifiCorp
InventorPaul M. Fahlsing
Life of this patent
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Abstract
The present invention comprises a method and device for deterring the freezing within a condenser by preventing critical pressure differentials from building up between the exhaust steam header and the air ejector systemy. The means for regulating pressure in the air ejector system prevents the pressure difference between the turbine exhaust and the air ejector system from being great enough to carry condensate through a condensing tube into an air ejector system.
Claims10
A method for preventing freezing in the counter current flow section of a power plant air cooled condenser comprising the steps of:
- measuring the pressure within an exhaust steam header connected to tubes of the air cooled condenser and the pressure within an air ejector system header connected to the counter current flow section to obtain a pressure differential between the exhaust steam header and the air ejector system header;
- regulating the pressure differential in the air ejector system header;
- and
- maintaining a controlled differential pressure between the air ejector system header and the exhaust steam header when ambient temperatures are near freezing to prevent freezing.
A device for preventing freezing, in a counter current flow section of a power plant air cooled condenser comprising:
- means for measuring ambient temperature;
- means for measuring a pressure differential between an exhaust steam header connected to tubes of the air cooled condenser and an air ejector system header connected to the counter current flow section;
- means for regulating the pressure differential between the exhaust steam header and the air ejector system header;
- and
- means for maintaining a controlled differential pressure between the air ejector system header and the exhaust steam header when measured ambient temperatures are near freezing.
Dependencies are inferred from the claim text.