Wstępny model sedymentacji osadów lakierniczych w rekuperatorze kabiny lakierniczej

P Nikończuk

doi:10.17531/ein.2018.3.6

Abstract

Overspray sediments settling on the recuperator’s fins cause operational problems. The cross sections of the recuperator’s channels gradually decrease and finally it result in clogging of the recuperator. The layers of sediments cause air flow resistance and also heat transfer resistance. The paper presents preliminary results of sedimentation process modeling. The model of overspray creation takes into account a droplets size and particles concentration in air stream inside extraction ducting. Simulation results are compared with measurements conducted in three commercial spray booths.

Highlights

During the operation of the spray booth in the painting mode, the air in the spray booth is constantly replaced
The volume of the used paint has a significant impact on the thickness of overspray sediments; it takes on variable values during the operation of the spray booth
The growth rate of the sediments layer is determined on the basis of the booth working time in the painting mode and the flow rate volume of the applied lacquer

Summary

Introduction

During the operation of the spray booth in the painting mode, the air in the spray booth is constantly replaced. The volume of the used paint has a significant impact on the thickness of overspray sediments; it takes on variable values during the operation of the spray booth. This requires determining fixed intervals between technical inspections of the recuperator or adopting a quasi- periodic strategy [8]. There are many publications on the effectiveness of paint stop filters [4, 6, 7], other media [10, 12] or alternative methods [20, 25] They do not include aspects of the impact on the operational conditions of the spray booth. The growth rate of the sediments layer is determined on the basis of the booth working time in the painting mode and the flow rate volume of the applied lacquer

The phenomenon of overspray aggregation

A general model of particle deposition in turbulent flow

Simulation model

Simulation results

Conclusion