Boiler Plants - Energy Conversion and Management - page 76

Fig. 6.8 Stack gas losses (natural gas)

Depending on heat input as fuel, either Higher or Lower Heating Value,
percentage losses are as follows:
total losses as % of Higher Heating Value

ð Þ

¼ total losses as % of Lower Heating Value ð Þ=αþ 100 α ð 1 Þ=α

For natural gas, ratio 1.12; thus

total losses as % of Higher Heating Value

α ¼

ð Þ

¼ total losses as % of Lower Heating Value ð Þ= 1 : 12 þ 10 : 7

For fuel oil ratio 1.065; thus

total losses as % of Higher Heating Value

α ¼

ð Þ

¼ total losses as % of Lower Heating Value ð Þ= 1 : 065 þ 6 : 1