To optimize the operation metallurgical gas boilers

the energy-loss analysis is usually adopted to monitor the deviation between the operating value and the target value of key operating parameters. Based on the basic equations of metallurgical gas boilers

this study derives a simple calculation method for excess air coefficients of flue gas of the gas power boilers

and proposes an improved calculation model for thermal efficiency of the gas boiler. From the aspects of boiler thermal efficiency and auxiliary power consumption rate

the energy-loss analysis model reflecting the effect of the difference in main operating parameters(such as the exhaust gas temperature

exhaust oxygen content

exhaust gas volume fraction and gas calorific value) on the power coal consumption of the unit is established. Moreover

by using the above energy-loss analysis model

the main operating parameters of a 240 t/h gas boiler is analyzed. The results show that

the model can accurately calculate the deviations of the coal consumption caused by deviation of the boiler operating parameters from the target value

which is of guiding significance for optimal operation of the gas boiler units.