A marine nuclear power once-through evaporator feed water depth deoxygenation system and deoxygenation method thereof

Abstract

The invention relates to marine nuclear power direct-current evaporator water-feeding deep-deoxygenizing system and method. The system comprises a condenser bubbling and deoxygenizing device, a low-pressure heater, a deoxygenator, an oxygen membrane removing device and a dosing device, wherein the bubbling and deoxygenizing device is integrated into a condenser and is connected with dead steam, and meanwhile, the condenser is further connected with the low-pressure heater through a condensate pump; the low-pressure heater is connected with the dead steam, and meanwhile, the low-pressure heateris connected with an injection port of the deoxygenator; the deoxygenator is connected with extracted steam from a turbine or fresh steam, and meanwhile, the deoxygenator is connected with an water supply system; the dosing device is connected with the water supply system; the oxygen membrane removing device is integrated into a balanced water tank; and the balanced water tank is connected with the condenser. According to the method, the multi-layered deoxygenizing system is formed through the combination of thermal deoxygenizing, hydrazine deoxygenizing and oxygen membrane removing. According to the marine nuclear power direct-current evaporator water-feeding deep-deoxygenizing system and method provided by the invention, the water-feeding deep-deoxygenizing requirements of a marine direct-current evaporator under various working conditions are met; part of functional equipment is integrated on the existing equipment, so that the cabin space utilization ratio is high; and the use ofconsumables is reduced, so that the economical efficiency is good.

Description

technical field [0001] The invention belongs to the deoxygenation technology of condensate feedwater in a secondary circuit, and in particular relates to a deep deoxygenation system and a deoxygenation method for marine nuclear power DC evaporator feed water. Background technique [0002] In the reactor and the primary circuit system, the heat transfer tube of the steam generator is an important part of the nuclear power system as the interface of the energy transfer between the primary and secondary circuits and a part of the pressure boundary of the primary circuit. The water quality of the secondary side has a greater impact on its corrosion. It needs to be paid attention to, and the oxygen content is an extremely important indicator of water quality. [0003] The feed water requirements for once-through evaporators are different from traditional marine boiler feed water and U-tube evaporator feed water. The oxygen content requirement of feed water for once-through evapo...

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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a marine nuclear power once-through evaporator feed water depth deoxygenation system and a deoxygenation method for the above-mentioned deficiencies in the existing marine deoxygenation technology. Combination of multiple methods such as oxygen removal film and other methods constitutes a multi-level oxygen removal system, which meets the requirements of marine DC evaporators for deep water removal under various working conditions; some functional equipment is integrated on existing equipment, and the cabin space utilization rate is high. ; Make full use of the waste steam energy of the system, while reducing the use of consumables, the system is economical

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