A complete gasifier system includes biomass charging equipment, the gasifier, gas cooling and cleaning system, and control system. The fuel is batch- or continuously loaded into gasifier using a skip charger or a bucket elevator. The gasifier converts biomass fuel into raw syngas. Raw syngas leaving the gasifier contains only low levels of water, tars and a small amount of fine soot and ash particles, which are removed in downstream gas cooling and cleaning equipment.

Both WBG and FBG gasifier systems we offer include an original gas cooling and cleaning system which cools and cleans syngas to less than 10 mg/Nm3 tars and less than 10 mg/Nm3 particulates without the need for wet scrubbing and associated tarry waste water formation. Gas cooling generates approximately 150 to 250 ml raw condensate per 1 kg fuel fed into gasifier (exact yield of condensate depends on moisture content in the fuel).

An original condensate treatment system reduces the raw condensate to a small amount of wet salts easily disposed of in commercial waste facilities or used as fertiliser.


Two series of gasifier systems are available:

WBG series gasifiers rated from 500 to 2,000 Nm3 of syngas per hour, running on chipped or briquetted wood and “as is” or briquetted agricultural wastes with moisture not more 20%, ash content not more 5%, and ash fusion temperature not less 1,150 degrees C. Some examples of biomass feedstocks and briquettes tested for gasification in WBG gasifiers are shown in Table 1 below. Our gasifiers have been tested with the widest range of biomass fuels on the market.

Table 1. Properties of biomass samples tested and approved for gasification in WBG gasifiers

Biomass
Average properties on dry basis
Moisture
Ash
Volatiles
Fixed carbon
Ash fusion
Almond shells6.84%1.6%78.32%20.08%No fusion at 1200°C
Coconut shells11.42%1.63%74.79%23.58%No fusion at 1200°C
Corn cobs17.91%1.09%80.72%18.19%Fusion at 1000°C a)
Cotton stalks9.48%3.39%72.43%24.18%No fusion at 1200°C
MDF dust/sawdust briquettes8.05%1.12%74.40%24.48%Slight deformation at 1200°C
Oil palm kernel shells5.58%1.67%72.93%25.4%No fusion at 1200°C
Plywood off-cuts9.99%1.25%77.18%21.57%No fusion at 1200°C
Sunflower husk briquettes9.01%2.79%78.21%19.00%Slight deformation at 1200°C
Vineyard pruning9.57%3.04%73.85%23.11%Slight deformation at 1200°C
Wood chipsDried to < 20%0.22%85.14%14.84%No fusion at 1200°C
Wood off-cuts (hard wood)9.55%0.05%80.44%19.51%No fusion at 1200°C
Wood off-cuts (soft wood)6.58%0.06%81.65%18.29%No fusion at 1200°C
a ) If ash content is very low e.g. 1% then ash fusion temperature acceptable for gasification in WBG gasifiers can be as low as 1000°C
 

FBG series gasifiers rated from 500 to 2,000 Nm3 of syngas per hour, running on fine wood chips and loose agro wastes with particle size or more 2mm and bulk density more than 100kg/m3 such as rice husk, sunflower or soybean husk, threshed bagasse, mustard and cotton stalks, peach, plum and apricot stones, hazelnut and walnut shells, dry olive pomace and stones, and high density pellets made from any biomass with ash fusion temperature not less 1,050 C. Some examples of loose biomass and pellets suitable for FBG gasifiers are shown in Table 2 below.

Our systems can convert many types abundant and low value biomass waste into valuable renewable electricity for sale to grid or on-site use and heat that can be utilised on site.

Table 2. Properties of loose biomass and pellet samples tested and approved for gasification in FBG gasifiers

Biomass
Average properties on dry basis
Moisture
Ash
Volatiles
Fixed carbon
Ash fusion ᶜ⁾
Apricot stones (loose)6.72%1.98%77.90%20.12%No ash fusion at 1100°C
Bagasse (loose)Dried to < 12%3.44%80.63%15.93%No ash fusion at 1200°C
Buckwheat hulls (loose)10.99%0.52%70.12%29.36%No ash fusion at 1200°C
Castor bean husk (loose)8.94%7.76%69.82%22.42%No ash fusion at 1100°C
Corn stalk (loose) a)
10.08%5.60%73.95%20.45%Slight deformation at 1100°C
Grape pomace (loose) a)
Dried to < 20%9.94%64.63%25.43%Deformation at 1100°C
Olive pomace (loose) a)
Dried to < 20%2.38%76.90%20.72%Slight deformation at 1200°C
Rice husk (loose)10.12%15.79%64.62%19.59%No ash fusion at 1200°C
Soy bean hulls (loose)7.93%4.06%82.33%12.61%No ash fusion at 1200°C
Sunflower husk (loose)9.47%3.05%73.76%23.19%No ash fusion at 1200°C
Sunflower husk (pellets)12.81%3.48%73.18%23.34%Slight deformation at 1200°C
Wheat straw (pellets)9.99%5.82%79.19%14.99%No ash fusion at 1100°C
Wood (pellets)8.52%0.42%73.34%23.71%No ash fusion at 1200°C
Wood lignin (pellets)9.27%6.03%61.40%31.67%Ash fusion at 1100°C ᵈ⁾
Wood shavings (loose)5.59%0.19%87.14%12.67%No ash fusion at 1200°C
a ) Bulk density of sized stalk is low and it does not flow properly, therefore, corn stalk pellets are recommended
b ) Fine particles less than 2mm should be removed, therefore, grape/olive pomace pellets are recommended. We can supply pellet lines suitable for this material.
c ) If necessary, ash fusion temperature can be increased by making pellets of mixed biomass
d ) Can be gasified with some derating of FBG gasifiers

 


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