Study of the influence of structural parameters on the operating characteristics of a new type of surge soot blower in the closed-ended system

Abstract

Boiler soot blower can effectively realize the removal of the accumulated ash inside the boiler, improve the operating efficiency of the boiler, which is of great significance to the safe operation of the boilerSPG-type surge soot blower is a new type of high-performance soot blower with a closed-port system which is developed on the basis of the traditional surge soot blowers.The use of numerical methods to validate the feasibility and analyze the working characteristics of this device can provide a reference for the practical application and improvement. Based on CFD technology, the SPG-type surge soot blower is taken as the research object, and the real movement process of the piston inside the device is simulated using dynamic mesh technology, and the dynamic process of continuous change of the flow field inside the SPG-type surge soot blower is simulated and calculated using Fluent software, and the structural parameters of the nozzle, the combustion chamber, and the pressure accumulator are adjusted, so as to obtain the influence law of changes in structural parameters of each component on the exhaust characteristics by monitoring at the outlet. By adjusting the structural parameters of the nozzle, combustion chamber and pressure accumulator, the structural parameters of each component are monitored at the outlet to obtain the influence law of the change on the exhaust characteristics and the working characteristics. The results show that: when the nozzle L/D ratio is increased from 2 to 4, the peak value of the outlet parameter shows a hysteresis phenomenon, but the peak value of the pressure and the peak value of the velocity get a significant increase, and the expansion loss can be reduced by changing the expansion section of the nozzle to a straight one, so it is a better solution to increase the nozzle L/D ratio appropriately and connect the straight pipe directly; the shortening of the spacing between radial and axial wall surfaces of the combustion chamber can increase the peak value of the outlet pressure, but the increase of the peak value of the pressure can be greater by shortening the axial distance. The increase in peak pressure is greater; in the pressure accumulator, removing the damping device increases the pressure less, and cannot slow down the piston reset, so that the discharge gas is reduced, and after removing the restrictor, the nozzle outlet pressure is greatly increased, but its peak duration becomes shorter.

Keywords

• spg shock wave dust collector
• internal flow field
• peak outlet pressure
• numerical simulation