US 3,945,331 AGranted

Thermal recovery system

AssigneeEnertherm, Inc.

InventorsDale E. Drake, Jerry J. Nelson

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Abstract

A dual function thermal recovery system for reducing pollutant emissions to the ambient and for utilizing normally wasted heat energy for beneficial purposes. A simple and efficiently operative assemblage of components for directly transmitting outlet stack gasses from an incinerator to a point of utilization such as a wood drying kiln, heat exchanger, or the like. A conduit connected directly to the outlet gas stack of the incinerator directs such outlet gas to the inlet of a constant volume centrifugal gas pump. Proximate the inlet of the gas pump, a branch conduit intersects the hot gas conveying conduit. An automatically thermostatically controlled valve is located within the branch conduit in selectively blocking relationship to relatively cool ambient air. An exhaust conduit is connected directly to the outlet of the gas pump for directing the output of such pump to a point of direct utilization, such as a drying kiln. By thermostatically controlling the valve which controls gas passage through the ambient air inlet branch conduit, the proportion of hot and relatively cool ambient gasses and consequently the temperature of the mixed gasses will be regulated since the gas pump or fan continues to transmit a fixed gas volume to the drying kiln.

Claims12

Dependent claims

A pollution reducing-thermal recovery system having a source of heated gaseous fluid and user means for said fluid, said thermal recovery system comprising in combination and in stated order;

recovery fluid communication means for communicating said user means directly with said source of heated gaseous fluid, ambient fluid communication means connected with said recovery fluid communication means at a point of confluence, said ambient fluid communication means connected with said recovery fluid communication means downstream of said source for communicating ambient fluid to said recovery fluid communication means at said point of confluence, automatic valve means for automatically controlling the flow of said ambient fluid through said ambient fluid communication means in response to a system load condition of said user means, primary mixing means disposed downstream of said point of confluence and upstream of said user means for mixing said ambient fluid from said ambient fluid communication means and said heated gaseous fluid from said recovery fluid communication means, pump means having inlet means and outlet means, said inlet means being in direct communication with said primary mixing means for pumping mixed ambient and heated gaseous fluids from said primary mixing means to said outlet means, mixed fluid communication means connected with said outlet means for directly communicating said mixed ambient and heated gaseous fluids to said user means.

Dependencies are inferred from the claim text.