Utilising low temp. arising energy in industrial furnaces - increase enthalpy stream and energetic level of secondary arising energy on flue gas side outlet

摘要

The furnaces are fitted with a primary flue gas heat recovery installation for preheating the combustion air. The enthalpy etc. increase at the outlet of the flue gas recovery installation is increased by preheating alternately the flue gas or combustion air from low temp. secondary energy sources outside the flue gas heat stream. The treated flow is fed to the primary flue gas heat recovery installation. The treated flue gas is supplied from the heat recovery installation to a secondary flue gas heat utilising installation. ADVANTAGE - Effective combustion air preheating, with increased furnace efficiency.