Combined Pyrolysis and Combustion of Biomass
Regarding the fuel properties of btomass and waste particularly the high volatile matter it seemed to be necessary to develop an adjusted process to optimise the conversion of biomass. The new Combined Pyrolysis and Combustion process, the so-called Herhof-IPV-Verfahren(R), especially developed for utilisation of biomass, biological residues with small as well as with a high content of ash e.g. waste from agricultural production and forestry, processing industries and municipal sources is presented.This two-stage gasification process concept for fuels with a high amount of volatile matter material enables to produce a hydrogen-rich and undiluted synthesis gas with a low tar content. The process is based on the spatial separation of pyrolysis and heat generation. In the first reactor, a fixed bed reactor, drying and pyrolysis of fuel takes place in presence of hot ash from a fluidized bed combustor. Before leaving the reactor the produced gas, which contains higher hydrocarbons and tars, has to pass a hot ash layer where addition of steam supports tar cracking. Preliminary tests show that a strong reduction of tar will be achieved by passing the pyrolysis gas through a hot ash layer. The remaining char and ash are fed as fuel into the fluidized bed combustor where ash is heated up again by the reaction heat of char combustion. Both reactors, the fluidized bed combustor and the pyrolysis reactor, are connected by circulating ash whilst product gas from the pyrolysis reactor and flue gas from the fluidized bed combustor are kept separate. The resulting product gas is expected to be rich in hydrogen, low in tar and undiluted by nitrogen.
Stefan Hamel H.Hasselbach Wolfgang Krumm
Institute of Energy Engineering, University of Siegen, Siegen
国际会议
北京
英文
211-221
2003-10-08（万方平台首次上网日期，不代表论文的发表时间）