Method for cooling a low pressure steam turbine operating in the ventilation mode
First Claim
1. A method for cooling a low pressure steam turbine operating in a ventilation mode, which comprises:
- delivering steam through a closable inlet of a low pressure steam turbine when operating in a power generation mode and blocking off the closable inlet when operating in a ventilation mode;
feeding steam from an outlet of the low pressure steam turbine to a condenser for condensing the steam to condensate;
diverting at least one of the steam and the condensate from a bleed port between the inlet and the outlet through a bleed pipe to a preheater during operation in the power generation mode; and
supplying steam from outside the low pressure steam turbine through a steam transfer pipe to the bleed pipe in the ventilation mode.
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Accused Products
Abstract
A method is provided for cooling a low pressure steam turbine operating in a ventilation mode. The low pressure steam turbine has a closable inlet through which steam can be delivered when operating in a power generation mode and which is blocked off when operating in ventilation mode, an outlet which communicates with a condenser for condensing the steam to condensate and a bleed port between the inlet and the outlet. A bleed pipe is connected to the bleed port for diverting steam and/or condensate during operation in the power generation mode. Steam is supplied through a steam transfer pipe to the bleed pipe in order to cool the low pressure steam turbine when operating in the ventilation mode. Condensate may also be supplied to the bleed pipe. The cooling effect in the low pressure steam turbine is largely limited to those components which suffer most when it is operating in the ventilation mode, and the cooling provisions are extracted from resources that are already available.
52 Citations
15 Claims
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1. A method for cooling a low pressure steam turbine operating in a ventilation mode, which comprises:
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delivering steam through a closable inlet of a low pressure steam turbine when operating in a power generation mode and blocking off the closable inlet when operating in a ventilation mode; feeding steam from an outlet of the low pressure steam turbine to a condenser for condensing the steam to condensate; diverting at least one of the steam and the condensate from a bleed port between the inlet and the outlet through a bleed pipe to a preheater during operation in the power generation mode; and supplying steam from outside the low pressure steam turbine through a steam transfer pipe to the bleed pipe in the ventilation mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification