Methods of Thermal Calculations for a Condensing Waste-Heat Exchanger

• Autorzy: Rączka P. , Wójs K.

Identyfikatory

DOI

10.2478/cpe-2014-0034

• Języki publikacji: EN

Abstrakty

EN

The paper presents the algorithms for a flue gas/water waste-heat exchanger with and without condensation of water vapour contained in flue gas with experimental validation of theoretical results. The algorithms were used for calculations of the area of a heat exchanger using waste heat from a pulverised brown coal fired steam boiler operating in a power unit with a capacity of 900 MWe. In calculation of the condensing part, the calculation results obtained with two algorithms were compared (Colburn-Hobler and VDI algorithms). The VDI algorithm allowed to take into account the condensation of water vapour for flue gas temperatures above the temperature of the water dew point. Thanks to this, it was possible to calculate more accurately the required heat transfer area, which resulted in its reduction by 19 %. In addition, the influence of the mass transfer on the heat transfer area was taken into account, which contributed to a further reduction in the calculated size of the heat exchanger - in total by 28% as compared with the Colburn-Hobler algorithm. The presented VDI algorithm was used to design a 312 kW pilot-scale condensing heat exchanger installed in PGE Belchatow power plant. Obtained experimental results are in a good agreement with calculated values.

Słowa kluczowe

EN

condensation heat recovery; calculation of heat and mass transfer; heat exchanger; waste heat

PL

odzysk ciepła kondensacji; obliczanie transferu ciepła i masy; wymiennik ciepła; ciepło odpadowe

• Wydawca: Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
• Czasopismo: Chemical and Process Engineering
• Rocznik: 2014
• Tom: Vol. 35, nr 4
• Strony: 447--461
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Rączka P.

• Wrocław University of Technology, Faculty of Mechanical and Power Engineering, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland

autor

Wójs K.

• Wrocław University of Technology, Faculty of Mechanical and Power Engineering, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland

Bibliografia

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