Task $2$: Filtration $(6$P$)$

a$)$ A surface filter has a residual pressure drop over the filter medium after dust cake

removal of $250Pa.$ The regeneration pressure drop is set to $1200Pa.$ The filtration

process is stable. Sketch the pressure drop over the filter medium and the clean gas dust

concentration as a function of time for a time period of two cleaning intervals in the

following diagram. $(2$P$)$

b$)$ Explain the mechanism of dust cake removal from surface filters based on a sketch for a

single bag house filter element! $(2$P$)$

c$)$ What means dry scrubbing? Give an example for a dry scrubbing process! $(2$P$)$