Optimization of a shell-and-tube district heat condenser for a small back pressure combined heat and power plant
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Date
Authors
Saari, Jussi
Carvalho, Mariana M.O.
Sermyagina, Ekaterina
Vakkilainen, Esa
Kaikko, Juha
Journal Title
Journal ISSN
Volume Title
Publisher
HEFAT
Abstract
Wood-fired combined heat and power (CHP) plants are a
proven technology for producing domestic, carbon-neutral heat
and power in Nordic countries. Such plants are often of backpressure
configuration, the district heat condenser replacing the
vacuum condenser of a condensing power plant. The condenser
is usually a shell-and-tube heat exchanger with district heating
water on the tube side. In this paper, a new approach is presented
to optimize the condenser design considering not only the
design-point performance, but also variations in the operating
conditions. A power plant model is used to determine the plant
performance (net power output and boiler fuel consumption) as
a function of the main performance parameters of the condenser
at each point. Cuckoo search algorithm is used for the
optimization. The results show that although electricity price
variation has a significant impact on plant net cash flow rate, the
effects of electricity price and heat exchanger specific cost on
condenser design are low.
Description
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.
Keywords
Heat condenser