Page 133 - Boiler plant and distribution system optimization manual

118 Boiler Plant and Distribution System Optimization Manual

10. FUEL FLOW METER FOR EACH BOILER

1. Detects over-firing
• high exhaust temperatures
• dangerous over firing-exceeding safety valve
capacity

Figure 10.11—Rule of thumb for exhaust tempera- 2. Detects under-firing
tures • under utilization requiring additional boilers

3. Detects non-linear response in control system
• Under-response in control system
• Over-responding in control system

4. Individual boiler fuel consumption
• Vital for performance analysis
• Often required by EPA for emissions calcula-
tions

11. TRACK PERFORMANCE OF SMALL
HEATING UNITS AUTOMATICALLY
Figure 10.12—Tracking exit temperatures
Figure 10.14 and Figure 10.15
A handy way to monitor changes in exhaust
9. KEEP ACCURATE STATISTICS
temperatures of small boilers and furnaces. A
thermometer with a maximum indicating arm
continuously indicates the latest (highest) ex-
haust temperature even when the boiler or fur-
nace is not firing. The green tape shows original
“clean” condition and as the exhaust temperature
creeps up over time this change is shown by the
red maximum indicating needle. In the first case
the temperature has risen by 40F for a 1% efficien-
cy loss and in the second figure a 200F change
has occurred representing a 5% loss. It would be
very time consuming for plant personnel to ob-
tain this information without this special type of
thermometer.

12. RECOVER HOT CONDENSATE
Figure 10.13—How do you keep score? In the field of
professional competition like baseball and basketball
for instance, statistics and good record keeping are Potential Savings
vital to understanding individual and team perfor- High
mance. With the cost of energy having so much influ-
ence on the bottom line of business and industry good The loss of hot condensate wastes energy
statistics become very valuable to decision making. and money in several ways: