文摘
A pilot-scale biomass-gasification-reforming system (feedstock of 150鈭?00 kg/h, on a dry basis) was established to produce synthesis gas for liquid fuel synthesis. The design and operation of this system were preliminarily discussed. Reforming of biomass raw fuel gas over NiO鈭扢gO/纬-Al2O3/cordierite monolithic catalysts was investigated in a multi-tube reformer. The anti-coking and anti-sintering properties of NiO鈭扢gO/纬-Al2O3/cordierite monolithic catalysts were characterized. The results showed that the NiO鈭扢gO/纬-Al2O3/cordierite monolithic catalyst with a pore channel size of 7 脳 7 mm could continuously deal with biomass raw fuel gas containing large amounts of fly ash. No channel blocking was observed for a long time running. The pressure drop of the reformer was only below 700 Pa even under the conditions of fuel gas velocity of 1.4 m/s and fly ash content of 330 g N鈭? m鈭? in the raw fuel gas. The synthesis gas [H2 + CO > 60 vol %, H2/CO ratio = 0.9鈭?.0, and lower heating value (LHV) > 10 MJ N鈭? m鈭?] could be produced by the biomass-gasification-reforming process under the conditions of total equivalence ratio (ERT) of 0.27 (ERfirst of 0.23, ERsecond of 0.02, and ERthird of 0.02) and steam/biomass (S/B) ratio of 0.4. The cold gas efficiency was above 82%. The characterization of the spent catalysts by thermogravimetric (TG), X-ray diffraction (XRD), and inductively coupled plasma鈭抋tomic emission spectrometry (ICP鈭扐ES) analyses indicated that the NiO鈭扢gO solid solution structure in the catalyst could restrain the active Ni0 centers from agglomeration and decrease carbon deposition. No serious alkali compound deposition on the surface of the catalyst was detected after the 60 h time-on-stream test. The pilot-scale biomass-gasification-reforming system exhibited excellent operation stability and flexibility.