SUPERCRITICAL WATER GASIFICATION OF GLUCOSE IN BATCH REACTOR
Biomass is an ideal candidate for renewable energies and to decrease CO2 emissions. Most of the large-scale technologies already in use are efficient with dry biomass (pyrolysis for example). On the contrary, Super Critical Water Gasification (SCWG) is a recent way of treatment still in development for wet biomass. Above its critical point (22.1 MPa and 374℃) water has particular properties and is able to convert wet biomass into gas (hydrogen particularly) according to Eq. 1: CHxOy+(2-y)H2O (→)CO2+(2-y+x/2)H2 (1) In this paper, glucose is investigated as the model substance of biomass such as waste of food or wine industry. A kinetic study is performed in view to evaluate gasification efficiency and hydrogen proportion in gas phase as function of time in a batch reactor. Hydrothermal experiments were conducted in ten mini-autoclaves of 5 mL made in stainless steel 316. The temperature was varied from 400 to 600℃ while pressure was kept constant at 25 MPa. K2CO3 was used as catalyst (0.5 wt％) in order to improve the water gas shift reaction and decrease solids formation. Initial glucose weight percentage was between 5 and 20％. Gasification efficiency was evaluated as function of reaction time (0-240 min) by using a global parameter: Total Organic Carbon (TOC) of the residual liquid phase and by identification of some compounds in liquid and gas phases using the chromatography technique. The main results obtained showed that glucose was totally removed from the solution in a very short time (less than 30 min). Regarding to TOC values, the totality of the initial organic carbon disappeared during the first 60 min and a kinetic profile was proposed. K2CO3 improved the hydrogen formation and inhibited the solid formation. Concerning the gas phase, H2, CO2, CO and CH4 were the main gas products. The gas composition did not increase linearly with the reaction time.
Gasification hydrogen production supercritical water glucose
Q. WU E. WEISS-HORTALA R. BARNA
Université de Toulouse; Mines Albi; CNRS; Campus Jarlard; F-81013 ALBI cedex 09, FRANCE Ecole des Mines dAlbi, Centre RAPSODEE, Campus Jarlard, F-81013 ALBI, FRANCE
国际会议
北京
英文
818-824
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）