Aqua-chem, Inc.

Tod A Stansfield

Stephen R Wilkinson

Wilfred L Ayala

Todd L Anderson

Hyunjae Park

Brian W Huibregtse

An exhaust gas heat recuperation system for use with a boiler is disclosed. The heat recuperation system includes a plate-type heat exchanger for exhaust gas heat recovery for exchanging heat between an exhaust gas and a charge gas. The heat exchanger preferably includes a series of exhaust gas plates stacked alternately with, and parallel to, a series of charge gas plates. Each of the exhaust gas plates and charge gas plates have raised contained ridges to form a substantially sinusoidal path for directing the respective gas therealong. The shape of the path reduces exhaust gas particulate deposition. The charge gas flows in a countercurrent to the exhaust gas to facilitate maximum heat transfer. The heat exchange is particularly useful in laminar flow conditions. In one embodiment, the heat exchanger is connected to exhaust gas inlet and outlet conduits, change gas inlet and outlet conduits, and a condensate collection changer as part of an exhaust gas heat recuperation system, for use particularly in steam or hot water boiler applications. The heat exchanger can be used as a retrofit to existing boilers or integrated into a single unit as part of a new boiler construction.

Plate-type heat exchanger for exhaust gas heat recovery

Plate type heat exchanger for exhaust gas heat recovery

The present invention provides an air box throttle assembly for improved characterization of a combustion system in which an arrangement of three air shutters is used to maintain a fairly constant air to fuel ratio as the combustion system is driven from low fire to high fire. A high fire shutter and a main air shutter each comprise two vanes and are rotatably mounted within an air intake box for a combustion system. A low fire shutter is provided with a single vane and is fixed above the main air shutter. The high fire shutter is the principal regulator of large volumes of air entering the combustion system when operating at high fire. At high fire, the main air shutter is fully open and low fire shutter has little effect on the flow of air through the air intake box. Low fire shutter is the principal regulator of small volumes of air entering the combustion system when operating at low fire. At low fire, the main air shutter is substantially perpendicular to air flowing into the air intake box such that air flow is forced through a passageway defined between the low fire shutter and the main air shutter. When the combustion system is operating in the range between low fire and high fire, the high fire shutter is substantially open and the main air shutter is used to regulate the volume of air flowing into the combustion system.

Multiple-shutter throttle characterization assembly for burners

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Elm Grove, WI, United States of America

Tod A Stansfield