FOREIGN MATTER TRAP FOR WATER SUPPLY

PROBLEM TO BE SOLVED: To provide a once-through steam generator having a foreign matter trap which prevents foreign matters from being caught by a pipe in an economizer section and minimizes wear and damage of the pipe. SOLUTION: The foreign matter trap 46 is positioned near a bottom part of a circular water falling pipe passage 34. Supplied water flowing into a pressure container 11 via an inlet nozzle 28 is forcibly circulated in the foreign matter trap 46, then, is discharged into a flow space 36, and enters a section of a pipe 16 positioned in the economizer chamber 38. The foreign matter trap 46 is composed of a circular support ring 48 lying and crossing between a wall defined by a lower shroud 25 and an inner wall of the pressure container 11 in the economizer section 32, and is positioned near a lower end of the lower shroud 25. COPYRIGHT: (C)2011,JPO&INPIT