Sludge-reduction steam generator and method for manufacturing tube plate of sludge-reduction steam generator

Abstract

The present invention relates to a sludge-reduction steam generator and a method for manufacturing a tube plate for a sludge-reduction steam generator, wherein sludge sediment may be effectively removed from the inside of a steam generator of a pressurized water reactor. The sludge-reduction steam generator includes: a plurality of heat transfer pipes (2) disposed in the shape of a U such that heat-exchange hot water may flow in a pressure container; and one or more tube plates (3) penetrated by and coupled to the heat transfer pipes (2) so as to support the heat transfer pipes (2), wherein the tube plates (3) are provided with a coated layer (30) which is coated with a ceramic material having the same surface electrokinetic polarity (zeta potential) as an iron corrosion product in a predetermined range such that the deposition and attachment of sediment with respect to the surfaces of the tube plates may be prevented by inducing zeta potential with respect to the sediment so as to exclude the sediment from the surfaces of the tube plates. Furthermore, surface friction is reduced so as to facilitate the removal of the sediment which is precipitated on the surfaces of the tube plates.

Description

technical field [0001] The present invention relates to a steam generator with reduced fouling capable of effectively removing fouling deposits inside the steam generator of a pressurized light water boiler and a method for manufacturing a tube sheet of the steam generator with reduced fouling. Background technique [0002] The pressurized light water furnace nuclear power plant transfers the heat generated in the nuclear fuel to the steam generator, heats the supply water supplied from the secondary side, converts it into steam, and uses the steam to perform mechanical work in the turbine to produce electricity. [0003] On the secondary side of the steam generator, a large flow of supply water containing corrosion products of system structures causes a phase change and is transformed into steam. At this time, since the flow rate decreases, iron corrosion products contained in the supply water Deposits on the lower part of the secondary side of the steam generator. [0004...

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Problems solved by technology

Therefore, in order to remove the corrosion products deposited on the lower part of the steam generator, the removal operation was carried out at each planned preventive maintenance period by operating the steam generator blow-down system, but since the iron oxide has solidified on the steam generator The nature of the bottom of the device, so there is a problem that it is difficult to remove with the exhaust system

[0006] Moreover, a scheme has been effectively used recently, which uses a drug called a dispersant to make less deposition of iron corrosion products in the lower part of the steam generator, but it is accompanied by high costs in the use of a dispersant, and it is accompanied by water quality problems. pollution side effects

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