THERMAL SCIENCE

International Scientific Journal

Konstantin A Pleshanov

,

Ekaterina G Khlyst

,

Mikhail N Zaichenko

,

Kirill V Sterkhov

DESIGN OF A NATURAL CIRCULATION CIRCUIT FOR 85 MW STEAM BOILER

ABSTRACT
The paper describes research and design of fluidized bed steam boiler natural circulation circuit. The capacity of the drum boiler is 85 MW, superheated steam pressure is 98 bar. There are two variants research results of the designed circulation circuit. The first circulation circuit variant was designed as a complex circuit with a common downcomers and risers for the boiler evaporating screen. In the second variant the flow is separately supplied to and discharged from the evaporator that is divided into independent sections. We have researched and described the influence of heat absorption inequality on the furnace evaporation pads using the Boiler Designer software. We also have calculated main characteristics of the two-phase flow in the evaporation pads and evaluated reliability of the natural circulation. The circulation circuit is optimized from point of view of reliability and metal expenses. Results demonstrate that the specific quantity of metal of complex and simple circuit variants is approximately the same with equal reliability.
KEYWORDS
steam, drum, boiler, natural circulation, Boiler Designer, evaporator, reliability, circulation circuit, calculation, optimization
PAPER SUBMITTED: 2016-10-05
PAPER REVISED: 2016-12-17
PAPER ACCEPTED: 2016-12-21
PUBLISHED ONLINE: 2017-01-14
DOI REFERENCE: https://doi.org/10.2298/TSCI161005320P
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE No. 3, PAGES [1503 - 1513]
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Design of a natural circulation circuit for 85 MW steam boiler

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