title: Exergy analysis of the Chartherm process for energy valorization and material recuperation of chromated copper arsenate (CCA) treated wood waste.
abstract: The Chartherm process (Thermya, Bordeaux, France) is a thermochemical conversion process to treat chromated copper arsenate (CCA) impregnated wood waste. The process aims at maximum energy valorization and material recuperation by combining the principles of low-temperature slow pyrolysis and distillation in a smart way. The main objective of the exergy analysis presented in this paper is to find the critical points in the Chartherm process where it is necessary to apply some measures in order to reduce exergy consumption and to make energy use more economic and efficient. It is found that the process efficiency can be increased with 2.3-4.2% by using the heat lost by the reactor, implementing a combined heat and power (CHP) system, or recuperating the waste heat from the exhaust gases to preheat the product gas. Furthermore, a comparison between the exergetic performances of a 'chartherisation' reactor and an idealized gasification reactor shows that both reactors destroy about the same amount of exergy (i.e. 3500kWkg(wood)(-1)) during thermochemical conversion of CCA-treated wood. However, the Chartherm process possesses additional capabilities with respect to arsenic and tar treatment, as well as the extra benefit of recuperating materials.
authors.affiliation: Department of Mechanical Engineering, Katholieke Universiteit Leuven, Celestijnenlaan 300A, 3001 Heverlee, Belgium. anouk.bosmans@mech.kuleuven.be
authors.forename: A
authors.initials: A
authors.lastname: Bosmans
authors.forename: M Vanden
authors.initials: MV
authors.lastname: Auweele
authors.forename: J
authors.initials: J
authors.lastname: Govaerts
authors.forename: L
authors.initials: L
authors.lastname: Helsen
mesh_terms: D001149:Arsenates / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D005602:France; D006358:Hot Temperature; D007220:Industrial Waste / Q000032:analysis*; D059027:Recycling / Q000191:economics / Q000379:methods*; D012037:Refuse Disposal / Q000191:economics / Q000295:instrumentation / Q000379:methods*; D014835:Volatilization; D014934:Wood
chemical_list: D001149:Arsenates; D007220:Industrial Waste; C040890:chromated copper arsenate