METHOD OF ESTIMATING METAL TEMPERATURE OF BOILER HEAT TRANSFER PIPE AND METHOD OF ESTIMATING LIFETIME

• Main Authors: NAKAO MOTOROKU, SHIMIZU MASARU
• Format: Patent
• Language: English
• Published: 31.03.2011
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; METHODS OF STEAM GENERATION; STEAM BOILERS; STEAM GENERATION; WEAPONS

PROBLEM TO BE SOLVED: To provide a simple method of estimating a metal temperature of a boiler heat transfer pipe having general versatility and capable of estimating the metal temperature of the heat transfer pipe with high accuracy. SOLUTION: A relational expression of the metal temperature of the heat transfer pipe, a boiler operating time, and a thickness of oxidized scale formed on an inner face or an outer face of the heat transfer pipe is determined, the metal temperature of a gas downstream-side heat transfer pipe is estimated on the basis of a measured thickness of the oxidized scale of the gas downstream-side heat transfer pipe and a measured boiler operating time by using the relational expression, and the increase of metal temperature due to the oxidized scale of a gas upstream-side heat transfer pipe is determined on the basis of the estimated metal temperature as an initial metal temperature of the gas upstream-side heat transfer pipe, a measured thickness of the oxidized scale of the upstream-side heat transfer pipe, and the measured boiler operating time by using the operational expression, thus the metal temperature of the gas upstream-side heat transfer pipe is estimated. COPYRIGHT: (C)2011,JPO&INPIT