OVERHEAT PREVENTING DEVICE OF FORCED CIRCULATION PART IN FORCED CIRCULATION BOILER

摘要

PURPOSE: To provide an overheat preventing device of the forced circulation part of a boiler in which the rupture of a pipe, the deterioration and burning of the material of the pipe or the like due to the overheat of the heat transfer pipe are not generated even when a boiler circulation pump is stopped because of the failure of the boiler circulation pump or the loss of a power source. ;CONSTITUTION: Overheat preventing pipes 8-1, 8-2, 8-3 and overheat preventing valves 9-1, 9-2, 9-3 are provided for releasing boiler circulation water or steam to a steam drum 1 or similar pipe stays disposed above a boiler directly or via other parts from heat transfer pipes 4-1, 4-2, 4-3 or pipe stays 7-1, 7-2, 7-3 disposed in the fluid bed 10 or a boiler forced circulation part including the fluid bed 10 and below the boiler. The generation of the rupture of the pipes, the deterioration or the burning of the material of the pipes due to the overheat of the heat transfer pipes 4-1, 4-2, 4-3 arranged in the fluid bed 10 or below the boiler is prevented.;COPYRIGHT: (C)1994,JPO&Japio