Determination of start-up curves for a boiler with natural circulation based on the analysis of stress distribution in critical pressure components

Jan Taler, Bohdan Węglowski, Dawid Taler, Tomasz Sobota, Piotr Dzierwa, Marcin Trojan, Paweł Madejski and Marcin Pilarczyk

Energy, 2015, vol. 92, issue P1, 153-159

Abstract: The paper concerns the possibility of accelerating the start-up of a steam boiler with the natural circulation. Shortening the start-up time will reduce start-up losses, including support fuel consumption. The paper presents the start-up for boiler from the cold, warm, and hot states. Using the European Standard EN 12952-3 permissible heating and cooling rates were determined for thick-walled components of the boilers, i.e. drums and the live steam outlet header. The pressure and temperature curves for the drum and outlet header of the boiler were also found. Moreover, a new method of the optimum heating of boiler drums proposed by the co-authors of the paper was used to determine optimum temperature and pressure changes of the fluid. In the proposed method of the heating optimization of boiler pressure components, abrupt fluid temperature changes are allowed at the beginning of the heating process. The calculations performed by both of these procedures, the Standard EN 12952-3 and proposed method, indicate that the boiler start-up time can be shortened from 6.5 to approximately 2 h.

Keywords: Steam boiler; Thermal stresses; Heating rate; Boiler drum; Superheater outlet header; Boiler start-up (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (18)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:92:y:2015:i:p1:p:153-159

DOI: 10.1016/j.energy.2015.03.086

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