Patent ID: 7878159
Filing Date: 2011-02-01
Classification: F22B,G21D,Y02E

Abstract:
1. The steam generator, comprising: a hollow sealed barrel; a heat-transfer tube group that includes a plurality of heat-transfer tubes of an inverted U shape which is arranged inside the hollow sealed barrel and through which a primary cooling water flows; a tube support that is arranged at a lower part inside the hollow sealed barrel and supports ends of the heat-transfer tubes; an incoming water chamber that is provided at a lower end of the hollow sealed barrel and communicates with one ends of the heat-transfer tubes; an outgoing water chamber that is provided at the lower end of the hollow sealed barrel and communicates with other ends of the heat-transfer tubes; a secondary cooling-water supply channel that supplies a secondary cooling water to the hollow sealed barrel for performing heat exchange with the primary cooling water flowing in the heat-transfer tubes; and a flow resistance adjusting unit that is provided in at least one of an inlet nozzle provided at the incoming water chamber and an outlet nozzle provided at the outgoing water chamber; wherein the flow resistance adjusting unit includes a plurality of flow resistance adjusting plates with different flow path areas detachably provided in at least one of the inlet nozzle and the outlet nozzle.