Page 191 - Boiler plant and distribution system optimization manual

176 Boiler Plant and Distribution System Optimization Manual

Figure 10.77—vent condenser opportunities. Sometimes there
is a lot of pure steam available leaving plants containing a lot
of energy.

10. WASTE HEAT FOR PROCESS 11. RECOVER STEAM AND HEAT FROM
APPLICATIONS HIGH PRESSURE CONDENSATE
RECOVERY SYSTEMS
Cost
This is usually a design function but if low
Moderate
pressure steam or hot water is being wasted, it
may be a good candidate for heat recovery.
Potential Savings
High
12. INSTALL A CONDENSING ECONOMIzER
Description TO HEAT MAKE-UP WATER
If waste heat can not be recycled into the
With natural gas fuel a deep economizer Tef-
boiler process, then it can be transferred for other
lon coated tubes, glass, stainless steel or titanium
applications like water heating and warm air for
that condenses flue gas water vapor can capture a
drying processes. The best choice is to return the
lot of wasted energy.
heat to the boiler itself, to eliminate load match-
ing and other complications.
13. ExTRACT COMBUSTION AIR AT THE
Advantages/Disadvantages
ROOF LEVEL OF THE PLANT
The complexity of transporting the heat to its
point of use may be expensive. When waste heat The high locations in boiler rooms can get quite
is returned to the boiler, automatic load matching hot. Hot air from this location and from around the
usually occurs. When using waste heat for pro- exhaust stacks can be drawn into the combustion
cess loads, the demand may not always match the air system. A percent or so efficiency improvement
boiler loads and special controls may be needed might be available from such measures.