The boiler thermal efficiency test requires strict operating conditions. Numerical simulation, which is considered as an economic and effective method to study the boiler combustion process, was adopted on a WNS2-1.25-Q gas-fired boiler. The combustion characteristics and boiler thermal efficiency were investigated. The simulation results are reliable, compared with thermodynamic calculation values. The results show that it is feasible to calculate boiler thermal efficiency by numerical simulation. This study can provide a new method for boiler efficiency calculation, which is beneficial to economics.
Keywords boiler thermal efficiency, gas-fired boiler, combustion characteristic, numerical simulation