Coal-combustion Simulation And Vibro-acoustic Response In300MWe Down-fired Boiler

The article studies on two aspects, pressure fluctuation and vibro-acoustic resonance, in Anshun W-shaped boiler furnace wall vibration case.Firstly, use Fluent software to calculate boiler furnace combustion with numerical simulation method under working conditions. Temperature, pressure, velocity and air coefficient distribution are studied, the real condition of pulverized coal combustion are obtained, and which is valuable to optimize the imported conditions. Secondly, use ANSYS and Virtual Lab software with modal analysis method to analyze the furnace wall structure modal, furnace acoustic modal and structure-acoustic coupling modal. Whether the resonance is occurred can be obtained. Thirdly, while the actual vibration is with high amplitude in low frequency significantly (below10HZ), to add point constraints in rigid beam of the front wall to optimize front wall modal, the fourth arrangement is better considering the economy. The arrangement shaped#agrees with the development tendency of rigid beamFinally, the vibration and noise under harmonic excitation are studied.Combustion simulation is valuable to adjust the boiler combustion parameters, the quantitative data in vibro-acoustic resonance are lacked in the existing references on boiler vibration, so the result can provide valuable reference to vibro-acoustic resonance and safe design. The result of vibration and noise is of great value to control noise pollution.