Influence of environment temperature changes upon the efficiency and capacity of power plants

Dubovskoy S.V., Dr. Sci. (Engin.), Senior Research Scientist,
Babin M.E.,
Kadenskiy N.Y.
Institute of General Energy of the National Academy of Sciences of Ukraine, 172 Antonovycha St., Kyiv, 03680, Ukraine
Language: Ukrainian
Source: The Problems of General Energy, 2013, 3(34):35-46
Section: Study and optimization of the technological objects and systems of the energy sector
UDC: 621,311,22+621,311,25:621.039
Received: 29.07.2013
Published: 12.11.2013

Abstract:

The article considers the possibility of adaptation of the power industry to the changes of climatic factors. In recent years it has become clear that current abnormal climate changes are likely to gain a regular character, forming a long-term trend of both rising the average earth surface temperature and the increase in frequency and amplitude of abnormal climatic phenomena, paying more and more considerable physical impact upon the power infrastructure. The changes can fluctuate significantly during the lifetime of power objects, lasting for decades.
That’s why studies aimed at determining the level of vulnerability of the fuel and power complex towards climate changes become highly relevant. The studies aim at elaboration of measures for adaptation of the whole power industry and of its individual enterprises to the probable climate changes.
Most part of the work is devoted to evaluation of the climate vulnerability of the closed cycle thermal power plants’ efficiency, i.e. the power steam turbines of TPP, CHP and NPP, included into the generating capacities of the United Power Systems (UPS) of Ukraine with water cooling system: both the forward flow ones, using natural river water and large reservoirs, and the reversible ones, using artificial cooling circulating water in cooling ponds, spray ponds and wet cooling towers.
Methodological aspects of influence, exerted upon efficiency and capacity of power plants by ambient temperature changes, have been elaborated. Сalculation of changes in power and efficiency of TPP, CHP and NPP steam turbines with accordance to the cooling water temperature by power characteristics has been carried out. Numerical evaluation of temperature dependence of capacity and efficiency of typical TPP and NPP turbines was carried out.
It was concluded, that due to a significant non-linearity of temperature change processes, appropriate values of temperature coefficients of efficiency in particular temperature zones should be available for their correct representation, such particular zones are picked out.
Air temperature makes the most significant impact upon fossil fueled heating plants. The effect of air temperature increasing is taken into account in energy characteristics of water-heating boilers in the form of an amendment to the gross efficiency, provided for the most common in Ukraine PTVM-100 district heating boilers.

Keywords: climatic factors, energy characteristics, efficiency, temperature, steam turbine plants, steam condensation.

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