Heat exchange – Regenerator – Cleaning
Patent
1989-11-22
1991-09-03
Davis, Jr., Albert W.
Heat exchange
Regenerator
Cleaning
165 7, 165 10, 165913, F28D 1904, F28G 900
Patent
active
050444247
ABSTRACT:
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 generators and combustion air are passed in heat exchanger relationship at diametrically opposite sides of a rotary type air preheater. The heat exchanger 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 SO.sub.3 in the form H.sub.2 SO.sub.4 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 netralizer 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.
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