Not sure that we understand your question....
In the USA, there are many "waste-to-energy" plants that burn municipal solid waste (MSW) and produce ash and electricity.
MSW is burned in large boilers specifically configured to resist the corrosive effects of firing. The technique is called "mass-burning". Boilers are equipped with pollution control equipment (typically SNCRs and fabric filters) on the tail end.
The book "Steam", by B&W contains details of boiler deisign and material handling.
Does this help ?
-MJC