Using Air for Increasing the Depth of the Flue Gas Heat Recovery

Abstract

Abstract. The methods of flue gas heat recovery have been reviewed and carried out their effectiveness analysis. Revealed a theoretical limit of flue gas deep heat recovery and suggested possible ways to achieve them. The possibility of using air as a heated medium is discussed in more detail.

Design and Experimental Investigation of Novel Flue Gas Condenser

“…Stoichiometrically combusted natural gas contains 1.5 kg of water vapor in 1 m3 of flue gas [6]. In other words, the moisture value in the flue gas is 108-150 g/kg of dry gas [8]. Approximately 20% of the heat energy generated as a result of combustion in natural gas-fired boilers is released into the atmosphere from the chimney [9].…”

“…Teorik olarak tam yanma veriminde yakılan doğalgazın 1 Nm3 baca gazında 1.5 kg su buharı bulunmaktadır [7]. Diğer bir şekilde ifade etmek gerekirse baca gazındaki nem değeri 108-150 g /kg kurugaz 'dır [8]. Kazanlarda yanma sonucu açığa çıkan ısı enerjisinin yaklaşık olarak %20' si bacadan atılmaktadır [9].…”

Simulation of Surface-Type Condensing Units for Heat Recovery from the Flue Gas with Air Heating

“…Scientists develop the recovery technologies and improve the heat transfer calculation methodologies with water vapor condensation contained in the flue gases [1][2][3]. The technology developed allows to increase the flue gas heat recovery depth through the use air as a heated medium [4,5]. For designing the installations, that implement this technology, are required the mathematical model that allows to carry out the thermal and constructional calculations of the entire system, including the component parts.…”