Experimental Study on Herb Residue Gasification in an Air-Blown Circulating Fluidized Bed Gasifier

Abstract

The gasification characteristics of herb residue for producing syngas in a pilot-scale circulating fluidized bed were investigated experimentally in this paper. The results indicated that the gas composition and tar yield were affected by the parameters including the equivalence ratio (ER), biomass feeding rate (FR), and steam-to-biomass mass ratio (S/B). The concentrations of combustible gases (H2, CO, CH4, and C n H m ) showed a decreasing trend with increasing ER, while the lower heating value (LHV) exceeded 4.0 MJ/N·m3 in all cases when the ER was lower than 0.4. An increase in the ER can improve the reaction temperature, facilitate carbon conversion, and decrease the tar yield. The LHV increased gradually from 4.2 to 5.7 MJ/N·m3 with an increase in the FR from 210 to 352 kg/h. The cold gas efficiency and carbon conversion efficiency reached their maximum values of approximately 68% and 93% at a feeding rate of 352 kg/h, whereas both of them decreased with a further increase in the feeding rate. The supplement of steam into the gasifier improved the LHV of the product gas, which reached a maximum value of about 6.0 MJ/N·m3 when S/B was 0.23–0.43 and the cold gas efficiency and carbon conversion efficiency were within 62–73% and 87–94%, respectively.

Olive oil residue gasification and syngas integrated clean up system

“…Therefore the lower content of heavy organic species, which are the principal causes of catalyst deactivation for carbon deposition, dragged with the gas contributes to delay this phenomenon in the reforming reactor. The calorific value of the syngas produced ranges between 3.9 and 4.3 MJ/Nm 3 , these values are in accordance with the values obtained for air gasification in literature and in the existing plants [25,26]. The gasification tests lasted 4 h, from Fig.…”

Review of Biomass Thermal Gasification

“…Typical values of ER ranges between 0.2 and 0.4 [24]. Guo et al [36] reported that increasing ER decreases the concentration of combustible gases (H 2 , CO, CH 4 , and C n H m ). The heating value was higher than 4 MJ/Nm 3 when ER is kept lower than 0.4.…”

Study of low‐cost and high‐performance biomass activated carbon for phenol removal from wastewater: Kinetics, isotherms, and thermodynamics

“…For instance, Karri et al reported that 63% to 96% phenol can be removed using low‐cost agricultural waste coconut shell‐based AC in a laboratory scale fluidized bed reactor. In addition, phenol is one of the main components in tar from biomass thermochemical conversion such as pyrolysis and gasification, and polluted water can also be produced if using water washing as tar removal method . In light of biomass thermochemical process, the utilization of biomass ACs appears to be a very promising alternative to deal with the tar problem and realize overall clean conversion of biomass.…”

“…In addition, phenol is one of the main components in tar from biomass thermochemical conversion such as pyrolysis and gasification, and polluted water can also be produced if using water washing as tar removal method. 13 In light of biomass thermochemical process, the utilization of biomass ACs appears to be a very promising alternative to deal with the tar problem and realize overall clean conversion of biomass. As a consequence, in this study, ACs from biomass were prepared and used as the adsorbent to remove phenol from water with low cost, small investment, and stable effect.…”