F - Mech Eng,Light,Heat,Weapons – 28 – D
Patent
F - Mech Eng,Light,Heat,Weapons
28
D
257/7
F28D 19/04 (2006.01) F28G 9/00 (2006.01)
Patent
CA 1290742
IMPROVED HEAT GENERATOR Abstract of the Invention A method and apparatus for improving the efficiency of the thermal section of a large scale power plant heat generator in which combustible fuels such as fossil fuels, refuse or other materials are burned are described. Flue gas generated in the heat generator and combustion air are passed in heat exchange relationship at diametrally opposite sides of a rotary type air preheater. The heat exchange relationship is selected so that it causes removal of a substantial amount of heat from the flue gas whose temperature is consequently lowered to a level where a corrosive pollutant such as SO3 in the form H2SO4 condenses out. During operation the rotor is rotated at a slow speed while a strong localized stream of wash liquid is applied onto a portion of the rotor in the air preheater along a zone selected to enable a drain down of wash liquid before the wetted portion reenters the air flow side. A neutralizer liquid is applied in such a manner that a dry barrier layer is formed over the heat exchanger surfaces to protect these against corrosive effects from condensed pollutants for long time periods. Preferred ranges of operating parameters are described to achieve high fuel savings. These parameters include rotor speed, heat capacities of the air flow, the rotor and the washing liquid.
526583
Bereskin & Parr
Monro Richard J.
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