Turbine condenser vacuum-pumping system with coolers and control method

Abstract

The invention relates to a power generation assisting device, in particular to a turbine condenser vacuum-pumping system with coolers and a control method. Waste steam of a turbine is stored in a hotwell after being condensed in a condenser; non-condensable gas is introduced to a gas inlet of a steam-jet ejector; and exhaust air at the penultimate stage of the turbine is introduced to a jet portof the steam-jet ejector. The system comprises the air cooler, the cooling water cooler, the freezing water cooler and a vacuum pump which are sequentially connected to an air outlet of the steam-jetejector, wherein an air outlet of the air cooler is connected with an air inlet of the cooling water cooler through a first valve; an air outlet of the cooling water cooler is connected with an air inlet of the freezing water cooler through a second valve; the air outlet of the air cooler is connected with the vacuum pump through a first bypass with a third valve; and the air outlet of the coolingwater cooler is connected with the vacuum pump through a second bypass with a fourth valve.

Description

technical field [0001] The invention relates to an auxiliary equipment for power generation, in particular to a vacuum pumping system and a control method for a steam turbine condenser with a cooling device. Background technique [0002] The condenser is one of the important auxiliary equipment of the power plant. The vacuum degree of the condenser is directly related to the power generation efficiency, which in turn affects the efficiency of the power plant. The non-condensable gas that enters the condenser with other factors is suctioned and discharged into the air. [0003] In actual operation, when the high back pressure pumping heat supply is running in summer, due to the increase of ambient temperature, the vacuum pump is used to pump air to reduce the air partial pressure and increase the vacuum. The vacuum pump will not only suck more water vapor into the The vacuum pump causes cavitation, damages the equipment, and shortens the service life of the pump, and the act...

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Problems solved by technology

[0003] In actual operation, when the high back pressure pumping heat supply is running in summer, due to the increase of ambient temperature, the vacuum pump is used to pump air to reduce the air partial pressure and increase the vacuum. The vacuum pump will not only suck more water vapor into the The vacuum pump causes cavitation, damages the equipment, and shortens the service life of the pump. Moreover, the actual working temperature of the vacuum pump (>20°C) is generally higher than the design working temperature (15°C) of the vacuum pump. The working temperature will greatly reduce the suction capacity of the vacuum pump of the existing unit, which will affect the safety and economy of the unit

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