Particle impaction efficiency and size distribution in a MSWI super heater tube bundle

TL;DR

This study uses direct numerical simulations to analyze particle impaction efficiency and size distribution in a municipal solid waste incinerator's super heater, revealing how flow velocity affects particle impaction and providing quantitative flux data.

Contribution

It introduces a detailed numerical approach to study particle impaction in MSWI super heaters, including flow effects and particle size distribution analysis.

Findings

Decreasing flow velocity reduces impaction efficiency for certain particle sizes.

Particle size distribution measurements enable quantification of mass fluxes on tube surfaces.

Flow velocity significantly influences particle impaction behavior.

Abstract

Particle impaction in the super heater geometry found in the municipal solid waste incinerator (MSWI) of GKS in Schweinfurt, Germany, has been investigated. By using direct numerical simulations for the fluid flow, inertial particles coupled to the fluid through the classical Stokes' drag law have been tracked. Focus has been on the effect of flow velocity, and it is shown that decreasing the flow velocity will drastically decrease the impaction efficiency for some particle radii. Finally particle size distribution measurements are presented and used to find quantitative mass fluxes both on the front and the back side of the tubes in the super heater tube bundle.