Content of collections

Assessing the possibilities for improving energy efficiency of TPPs based on flue gas heat exchangers and using heat pump installations

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: Ukrainian
Source: The Problems of General Energy, 2015, 2(41):48-56
https://doi.org/10.15407/pge2015.02.048
Section: Study and optimization of the technological objects and systems of the energy sector
UDC: 621.311.22
Received: 24.07.2015
Published: 26.08.2015

Abstract:

Possible volumes of exhaust flue gas heat recovery by using heat pump installations at Ukrainian TPPs have been determined. The heat recovery system diagram provides for a waste heat exchanger installed at the flue gas paths with recovered heat being transferred to the centralized heating system by a heat pump installation. 
The problem is that changes in the TPP load bring about changes in the boiler output. As a result, the heat flow carried out by flue gases also changes. It is therefore necessary to determine optimal capacity of the heat pump installations, which will provide maximum efficiency of such plants throughout the year.
A method is presented to calculate optimal capacity for heat pumps at TPPs according to steam pressure. Possible fuel saving has been estimated for the system of the largest Ukrainian TPPs with the total installed capacity of 4,936 MW. The optimal capacity of heat pumps for the plants is 273 to 340 MW, including 99 to 120 MW pumpts for 8.8 MPa steam pressure TPPs, 107.5 to 134 MW pumpts for 12.7 MPa steam pressure TPPs, and 67 to 83 MW pumps for 23.5 MPa pressure TPPs with flue gas recovery being 60% and 80%. It is demonstrated that the total energy saving may be achieved in the range of 250,000 to 550,000 tons or more of standard fuel per year depending on the condition of the equipment and heat pump capacity, and subject to the improvement of the average efficiency of the boilers by 7 to 9%.

Keywords: TPP, heat recovery, centralized heating system, heat pump, calculation methods, fuel saving.

References:

  1. Kulyk, M.M., Bilodid, V.D. (2014). Operative conditions and attainable volumes of using heat pumps at heat and power plants in the Intagrated Power System of Ukraine. Problemy zahal'noi energetyky - The Problems of General Energy, 1(36), 33-38 [in English].
  2. Large-scale Heat Pumps for Swedish Municipal Incineration Plant. (1999). European Heat Pump News. The Newsletter of the European Heat Pump Concerted Action, 2, August, 6-7 (Umea, Sweden).
  3. Baskakov, A.P., Berg, B.V., & Vitt, O.K. (1999). Teplotekhnika [Thermal Engineering]. Moscow: Energoatomizdat [in Russian].
  4. Kuznetsov, Ye.V. et al. (1973). Teplovoj raschet kotel’nykh agregatov: Normativnyi metod [Heating calculation of steam generating units: Normative method]. Moscow: Energija [in Russian].
  5. Sokolov, Ye.Ya., & Borodianskij, V.M. (1981). Energeticheskie osnovy transformatsii tepla i protsessov okhlazdenija [Energy basis for the transformation of heat and cooling processes]. Moscow: Energoisdat [in Russian].
  6. Kulyk, M.M., & Bilodid, V.D. (2006). Problemy i perspektyvy rozvytku v Ukrayini teplonasosnykh tekhnolohii [The problems and prospects of thermal-pump technologies development in Ukraine]. Problemy zahal'noi energetyky - The Problems of General Energy, 2(14), 7-12 [in Ukrainian].
  7. Ryzhkin, V.Ya. (1976). Teplovyje elekticheskije stantsii [Thermal power plants]. Moscow: Energija [in Russian].
  8. Yelizarov, D.P. (1967). Teploenergeticheskije ustanovki elektrostantsij [Heat and power installations at power plants]. Moscow: Energija [in Russian].
  9. Sokolov, Ye.Ya. (1967). Promyshlennyje teplovyje elektrostantsii [Industrial thermal power plants]. Moscow: Energija [in Russian].
  10. Benenson, Ye.I., & Ioffe, L.S. (1986). Teplofikatsionnyje parovyje turbiny [Cogeneration steam turbines]. Moscow: Energoatomizdat [in Russian].

Downloads:

Full text (PDF)