BOILER, MARINE STEAM TURBINE PROPULSION SYSTEM, SHIP WITH THE SAME AND BOILER CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a boiler capable of appropriately managing a temperature of a superheater.SOLUTION: The boiler comprises: a steam introduction path 74a for extracting steam from a steam extraction part 59e at an intermediate position of a superheater 37; a steam return path 74b for returning steam to a steam return part 59f of the superheater 37; a desuperheater 76 which reduces a temperature of steam; a first steam flow regulating valve 80 and a second steam flow regulating valve 81 for regulating the flow of steam to flow to the desuperheater 76; and a first temperature sensor 72 for measuring a first steam temperature T1 at a downstream side in steam flow of the steam return part 59f of the superheater 37 and at the intermediate position of the superheater 37. The boiler has superheater outlet temperature relation information R1 defining a relation between a superheater outlet temperature T2 that is a steam temperature in an outlet of the superheater 37, and the first steam temperature T1. Based on the superheater outlet temperature relation information R1 and a measurement result of the first temperature sensor 72, the first steam flow regulating valve 80 and the second steam flow regulating valve 81 are controlled in such a manner that the superheater outlet temperature T2 becomes a target value.SELECTED DRAWING: Figure 3