Evaluation of flow properties of air at the exit of holes on the blow pipe in a pulse jet filter bag house

Abstract

In pulse jet filter bags, the pressurized air is discharged from the air reservoir into the filter bag via the diaphragm valve and blow pipe. The cleaning of the filter bag depends on the flow properties like pressure, velocity and mass flow rate of the air at the exit of the holes. The properties at the exit of the holes in a blow pipe, like the pressure, angle of inclination and mass flow rate, are studied numerically by analyzing a three dimensional model of the blow pipe. The experimental values of pressure at the exit of the fourth hole are used to validate the model. It is seen that the mass flow rates at the exit of the holes are not uniform. Also angle of exit air pulse from orifice is not coaxial to the axis of the orifice.