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Operative conditions and attainable volumes of using heat pumps at heat and power plants in the Integrated Power System of Ukraine

Kulyk М.M., Dr. Sci. (Engin.), Corresponding Member of the National Academy of Sciences of Ukraine, Bilodid V.D., PhD (Engin.), Senior Research Scientist
Institute of General Energy of the National Academy of Sciences of Ukraine, 172 Antonovycha St., Kyiv, 03680, Ukraine
Language: English
Source: The Problems of General Energy, 2014, 1(36):39-45
Section: Study and optimization of the technological objects and systems of the energy sector
UDC: 621.311.661
Received: 25.02.2014
Published: 19.03.2014

Abstract:

We investigate two variants of the operative conditions of heat and power plants with technological schemes where heat pumps are used for utilizing the heat of exhaust gases of steam generators: the variant with controlled electric power of heat and power plant and economical variant ensuring maximum cost effectiveness.
According to the variant with controlled electric power, the output thermal power transferred by heat and power plants to the heating system coincides with its rated thermal power. However, the thermal power taken off from the turbines decreases by 9.6%. According to this variant, the total electric power is reduced by 14% as compared with nominal conditions (without heat pumps). Generally, the total power transferred by heat and power plants outside under these operative conditions, with regard for the thermal power produced by the heat pumps, is by 4.5% less than the total power under nominal conditions. Therefore, the use of heat and power plants for regulating power can be cost effective only if they are engaged in solving system problems (in particular, for controlling power generation in response to the electric load demands) with the corresponding payments for such services by the power system.
The economical variant is much more cost effective. This variant provides the rated values of turbine power transferred to the electric generators, whereas the thermal power transferred to the heating system increases by 10.6%. The total power of heat and power plants increases by 5.6% as compared with the rated conditions.
A much greater additional effect under this variant can be achieved by using heat pumps, working at heat and power plants, as consumers-regulators in the system of automatic control of frequency and power as a part of the integrated power system.

Keywords: heat and power plant, heat pump, capacity, heat, electric power, balance, efficiency.

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