The Clayton Waste Heat Recovery System can be used to
generate steam or high temperature hot water. Typical combinations
of an exhaust gas or waste heat unit with a direct fired steam
generator are shown on page 5. A principal feature of the Clayton
Waste Heat Recovery System is its unique coil design. The
coil tube is wound in a spiral pattern with closely controlled spacing
between turns. This provides the desired area to control the
velocities of the boiler gases. This highly efficient heating surface
arrangement minimizes size and weight requirements.
The Clayton Exhaust Gas Boiler (EGB) is primarily used in
conjunction with a Prime Mover, such as a Turbine or Internal
Combustion Engine (100 kW to 15 mW), as part of a Distributed
Generation installation producing electricity or in marine/shipboard
applications. The typical Clayton EGB is constructed of
individual coil modules, with each module containing spirally
wound layers. The number of modules used depends upon the
exhaust gas flows, allowable back pressure and on the boiler
heat output requirements in steam or hot water.
The Clayton EGB module is available in various sizes and
configurations to meet individual requirements.
Clayton EGB modules can operate at temperatures up to
1,200°F (650 °C) and can run dry (without circulating water in the
tubes) at temperatures up to 840°F (450°C).
Once assembled with the appropriate coil modules, the
completed Clayton EGB includes inlet and outlet cones that permit
vertical or horizontal units with exhaust gas flows in any direction

For exhaust temperatures over 1,200°F
(650°C), the Clayton Waste Heat Steam Generator
(WHSG) is applied. The Clayton WHSG is primarily
used on incinerators, furnaces and thermal oxidizers
with exhaust temperatures up to 3,500°F (1,925°C).
The Clayton WHSG is designed much like the standard
Clayton direct-fired Steam Generator with water-
walls and air-cooled shells. Inlet and outlet casing
and connection pieces complete the unit for installation
in the client’s ductwork.
Another unique feature of both the Clayton EGB
and WHSG is the Clayton designed and manufactured
main feedwater positive displacement diaphragm pump.
The pump requires minimum maintenance since there are
no packings or mechanical seals to leak or require replacement.
Pistons are not exposed to feedwater being pumped
but run on lubrication oil so wear and tear due to the presence
of grit is eliminated.
As with the standard Clayton Steam Generator, all
the ancillary components such as the separator/steam
drum, feedwater tank, softeners, blowdown tank and
chemical pumps can be packaged on a common skid. All
piping and electrical work is completed by Clayton.