Based on heat transfer theory

the influence of air leakage into furnace and flue duct upon the exhaust gas temperature and exhaust gas loss have been studied and analysed.The air leakage into boiler increases the exhaust gas loss

the closer the air leakage position near to the furnace(including the furnace) the larger the exhaust gas loss is

and vice versa.In the event of air leakage coefficient in the gas and air system to be 0.1

it makes the exhaust gas loss to increase more than 0.2%

making the coal consumption of supplied power to increase about 2.0 g/kW·h.In operation of the boiler

the air leakage into the system should be controlled as far as possible

so as to enhance the economic behavior in operation of the unit.