Underground nuclear power station steam turbine dead steam air cooling system and using method thereof

Abstract

The invention discloses an underground nuclear power station steam turbine dead steam air cooling system, and relates to a nuclear power technology. The system comprises a steam generator, a steam turbine, a cyclone cooling tower, a condensed water tank and a condensed steam radiator, wherein the steam generator is sequentially connected with the steam turbine and the condensed steam radiator through a main steam pipeline; the condensed water tank is connected with the bottom of the steam generator through a main water supply pipeline; and the condensed steam radiator is connected with the top of the condensed water tank and arranged in the height direction of the cyclone cooling tower. According to the invention, exhaust steam of the steam turbine is air-cooled into liquid water through the cooling condensation effect of the cyclone cooling tower, the liquid water flows back into the steam generator through the gravity of condensed water, and the passive air cooling function of the exhaust steam of the steam turbine and the passive cooling function of the secondary side of the underground nuclear power station are achieved. The invention further relates to a using method of the underground nuclear power station steam turbine dead steam air cooling system.

Description

technical field [0001] The invention relates to nuclear power technology, more specifically it relates to an exhaust steam air cooling system for steam turbines in underground nuclear power plants. The invention also relates to the usage method of the steam turbine exhaust air cooling system of the underground nuclear power plant. Background technique [0002] The timely discharge of heat under accident conditions of nuclear power plants is an important measure to ensure the safety of reactors. The passive waste heat removal system is an important part of the passive safety system design of mainstream nuclear power plants. When the normal waste heat removal system fails, the waste heat from the core is discharged to ensure the safety of the reactor. [0003] The existing passive waste heat removal system mainly discharges the heat of SG into the emergency cooling pool by means of density difference, etc., and takes away the heat of SG through the temperature rise of the coo...

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Problems solved by technology

[0003] The existing passive waste heat removal system mainly discharges the SG heat into the emergency cooling pool by means of density difference, takes away the SG heat through the temperature rise of the cooling water in the cooling pool, and then discharges the heat into the atmosphere through the water surface of the cooling pool; This way of heat removal is highly dependent on the water temperature of the cooling pool. When the water temperature rises, its cooling capacity will drop significantly. In addition, the final heat sink of this cooling is the atmosphere.

[0004] It can be seen from the operation practice and development trend of thermal power plants that the use of air-cooling technology in thermal power plants can save a lot of water resources; for large water users such as nuclear power units, if air-cooling technology can be used, it can break geographical restrictions and apply to more The new site of the plant; among the existing air-cooling technologies, the mechanical ventilation air-cooling technology is relatively mature, which consumes a lot of power, and for nuclear power plants, once the power is cut off, it will bring great safety hazards

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