Is this an incinerator?

By definition, an incinerator is "a furnace or apparatus for incinerating something, esp refuse" (Collins English Dictionary) but which has no further benefit.

Lea Bank Energy Park offers beneficial outputs in the form of heat and electricity. By generating both heat and electricity in a usable form, LBEP is therefore defined as a Combined Heat and Power facility. It consumes RDF to generate electricity and heat which can be used by local homes and businesses. 

"Combined heat and power (CHP) is a highly efficient process that captures and utilises the heat that is a by-product of the electricity generation process." (Department for Business, Energy and Industrial Strategy)