Study type

Type of gasifier

Operating conditions

Particle size

Main findings


Experimental investigation and modelling study of long stick wood gasification in a top lit updraft fixed bed gasifier


MC: 25%, 180 W of blower power air supply,

T: 432˚C - 936˚C

ER: 0.26 - 0.43

H: nd

D: nd

sticks with length ∼68 cm and diameter ∼6 cm

・ measurement of the ER is a simple way of analyzing the behavior of the gasifier

・ TLUG gasified 90 kg of wood for 10 h in two batches per day


Low temperature gasification of olive kernels in a 5-kW fluidized bed reactor for H2-rich producer gas

5-kW fluidized bed reactor

MC: 10%wt - 12%wt

T: 750˚C - 850˚C and

ER: 0.2 - 0.4

H: 1400 mm

Bulk density (kg/m3): 573 size fraction of olivine (500 - 425 μm)

・ increase in ER deteriorated producer gas quality, decreased H2 content and favored CO2, thus lowering producer gas heating value


An experimental study on biomass air-steam gasification in a fluidized bed

a fluidized bed reactor of atmospheric pressure

T: 700˚C - 900˚C in 50˚C increments

Biomass feed rate: 0.445 kg/h;

air: 0.5 m3/h; steam rate: 1.2 kg/h

ER: 0.22; S/B: 2.7

size: 0.3 - 0.45 mm, silica sand (particle size 0.2 - 0.3 mm) as bed material

・ the LHV of fuel gas decreased with ER

・ the introduction of steam improved gas quality compared to biomass air gasification but excessive steam would lower gasification temperature and so degrade fuel gas quality

・ smaller particle more favorable for higher gas LHV and yield


Experimental investigation of a downdraft biomass gasifier

a blow-type downdraft gasifier

H: 2.5 m

ID: 600 mm

ER: 0.268 - 0.43

size of the biomass material (wood chips and furniture wood + charcoal) used was equivalent to 50 mm cube

・ calorific value of the producer gas increases with ER initially, attains a peak and then decreases with the increase in ER

・ the gas flow rate per unit weight of the fuel increases linearly with ER

・ complete conversion of carbon to gaseous fuel did not occur even for the optimum ER

・ optimum ER (0.38) for the best performance of the downdraft biomass gasifier


Scale-up of downdraft moving bed gasifiers (25 - 300 kg/h)-design, experimental aspects and results

downdraft moving bed gasifiers

H1: 1050 mm and H2: 1800 mm

・ Feed: 5 - 6 kg

unchanging air flow: 100 N∙m3/hr,

FCR: 50 kg/h and SGR: 0.283 kg/s∙m2

Particle size: 84% between 0.5 and 16 mm

・ air flow is an influential variable and it determines the biomass consumption and the gas and solid production

・ mass conversion efficiency (MCE) and cold gas efficiency (CGE) values increase with ER


Effect of pyrolysis temperature and heating rate on biochar obtained from pyrolysis of safflower seed press cake

fixed-bed reactor

H: 104 mm

ID: 70 mm

feed: 20 g

・ inert gas (nitrogen)

・ T = 400˚C, 450˚C, 500˚C, 550˚C and 600˚C

heating rates: 10˚C, 30˚C and 50˚C∙min−1

average particle size: 1.8 mm

・ biochar yield and quality depend principally on the applied temperature where pyrolysis at 600˚C leaves a biochar with higher fixed carbon (80.7%) and relative carbon content (73.8%), and higher heating value (30.3 MJ∙kg−1) in comparison with the original feedstock (SPC) and low VM content (9.80%)

・ the biochars had low surface areas (1.89 - 4.23 m2/g) and contained predominantly aromatic compounds


Simplifying pyrolysis: Using gasification to produce corn stover and wheat straw biochar for sorptive and horticultural media

top-lit updraft cookstove

・ average temperatures CS: 520 ± 150

WS: 550 ± 25

WS + GT: 595 ± 80

・ gasification time: 30 min

H: nd

ID: nd

ER: nd

pellets size: 6 mm diameter by 8 - 10 mm long

・ biochar from the gasification process had carbon content > 70% and an ash content of 25% which was equal or better than the same biochar produced using the retort oven

・ the same biochar showed successful use as a peat moss replacement in horticultural applications

・ gasification is a simpler, more cost-effective means to produce biochars and should be considered for horticultural and other similar applications