Selecting the cooling water mass flow rate for a power plant under variable load with entropy generation rate minimization

Rafał Laskowski , Adam Smyk , Janusz Lewandowski , Artur Rusowicz , Andrzej Grzebielec

Abstract

The paper deals with selecting the mass flow rate of cooling water under variable load of a power unit such that optimum operating parameters of the unit can be achieved. The change in the cooling water mass flow rate influences the resistance to flow (on the cooling water side) and the pressure of the condensing steam. A higher cooling water mass flow rate increases the resistance to flow and power supplied to the cooling water pump, but it also results in a drop in the condensing steam pressure and an increase in the power generated in the LP (low-pressure) part of the turbine. Since the change in the mass flow rate affects the performance of the condenser, the LP part of the turbine, and the cooling water pump, a system comprising these components was analyzed. The cooling water mass flow rate was chosen via minimization of the total entropy generation rate in these components and a change in the unit's power output defined as a difference between the power outputs of the LP part of the turbine and the cooling water pump. The aim of this paper is to find the optimum value of the mass flow rate of cooling water under variable load of the power plant
Author Rafał Laskowski ITC
Rafał Laskowski,,
- The Institute of Heat Engineering
, Adam Smyk ITC
Adam Smyk,,
- The Institute of Heat Engineering
, Janusz Lewandowski ITC
Janusz Lewandowski,,
- The Institute of Heat Engineering
, Artur Rusowicz ITC
Artur Rusowicz,,
- The Institute of Heat Engineering
, Andrzej Grzebielec ITC
Andrzej Grzebielec,,
- The Institute of Heat Engineering
Journal seriesEnergy, ISSN 0360-5442
Issue year2016
Vol107
Pages725-733
Publication size in sheets0.5
Keywords in PolishEnergia, strumień masowy wody chłodzącej, generacja entropii
Keywords in EnglishEnergy, Cooling water mass flow rate, Entropy generation rate, Steam condenser, Steam turbine set
DOIDOI:10.1016/j.energy.2016.04.074
URL http://www.sciencedirect.com/science/article/pii/S036054421630487X
Languageen angielski
Score (nominal)45
ScoreMinisterial score = 45.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 4.52 (2) - 2016=5.182 (5)
Citation count*8 (2018-06-17)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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