Waste heat recovery system

Liquid heaters and vaporizers – Subsidiary

Patent

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Details

165134DP, 165DIG12, 165 39, 237 8R, 237 9R, F22B 3300

Patent

active

043709494

ABSTRACT:
This invention relates to a system for reclaiming or recovering heat which would otherwise be lost from a heating plant. The invention accordingly relates to a heating plant incorporating a plurality of boilers, including a stand-by boiler, there being means for supplying fuel and air to at least one of said boilers, except for the stand-by boiler, and flue gas exhaust ducts associated with each of such boilers. The improvement according to the invention is a waste heat recovery system wherein the flue gas exhaust duct from said at least one boiler is operatively connected to the stand-by boiler for the circulation of hot flue gases therethrough in contact with its heat exchange surfaces thereby to effect the heating of water passing through the stand-by boiler thereby to recover a portion of the heat energy in the flue gases. The system further includes a means for controlling the temperature of the water in the stand-by boiler at temperatures above those necessary to avoid excessive cooling of the flue gases within the stand-by boiler and consequent undesired condensation of certain flue gas components on its heat exchange surfaces.

REFERENCES:
patent: 196597 (1877-10-01), Rivera
patent: 1633759 (1927-06-01), Breese
patent: 2074989 (1937-03-01), Orban
patent: 2369972 (1945-02-01), Meagher
patent: 3033192 (1962-05-01), Bogren
patent: 4037786 (1977-07-01), Munroe
patent: 4048962 (1977-09-01), Pristelski
patent: 4258878 (1981-03-01), Van Pachtenbeke
Stewart, D., "Fuel Energy Management Techniques", Paper Presented at Annual Convention of Ontario Hospital Association, Nov. 1978.

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