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FREQUENTLY ASKED QUESTIONS

I. Technical (Process)

What is Biomass Gasifier?

A biomass gasifier is device that converts biomass (wood blocks, wood chips, rice husk, saw dust, straw, grass, waste garden and other such agricultural residues) into a combustible gas called “producer gas”. The producer gas has a lower calorific value than CNG/LPG, but still can be used in oven/furnaces where the temperature requirement is up to 900 °C.

What is the gas generated from the Gasifier?

The gas generated from the gasifier is called “producer gas”. The main combustible components of the producer gas are Carbon monoxide (20-25% v/v), Hydrogen (8-10% v/v), Methane (2-4% v/v) and small quantities of other higher gaseous hydrocarbons besides other non-combustibles like Carbon dioxide (8-10% v/v) and nitrogen (50-55% v/v). The typical calorific value of this gas is 1200 kcal/m3, which much less than LPG/CNG. Typically flame temperatures of over 1000 °C can be achieved by this gas.

How does a Gasifier work?

The gasifier is a thermal reactor which thermally cracks the biomass into a gaseous state by the application of intense heat in a controlled oxygen starved atmosphere. The biomass is fed at the top of the reactor and moves downwards towards the grate by gravity. During this motion, it passes through the “drying”, “pyrolysis”, “controlled combustion” and “reduction” zones in that order. The boundaries of each of the zone above are not rigid but transitional. Moreover, depending on the wood characteristics and the load, the height of each zone also varies. Each of the zones, have a specific reaction component to perform, resulting in the formation of “producer gas” and ash/char mixture at the end of the reduction zone, where the grate is located.

What is the maximum working temperature achievable with producer gas/Gasifier?

Applications with temperature requirement up to 900°C can use producer gas / gasifier without any problems and any change in the existing system. With air preheating, the temperature requirement up to 1100 °C can be met.

How much wood does a gasifier consume?

A chart that gives the wood requirement to replace one unit of conventional fuel:

power 1 kWh
Biomass Required in Kg* 1,15 -1.5

* Indicative value for applications requiring < 500 °C. dependent of % moisture

Does the Producer Gas contain sulphur or other harmful gases?

No, Producer Gas does not contain sulphur or any other harmful gases. In fact, dust free producer gas can be used direct fired drying oven, without affecting the quality of the product at all.

Is there any pulsation/fluctuation in gas production in gasifiers?

No, Gasifiers have a very high thermal inertia, which ensure a very stable gas production.

Is there any pulsation/fluctuation in gas quality in gasifiers?

No, the wood/biomass takes over 2 hours to get fully converted to producer gas. Hence, small variations in fuel quality/characteristics get averaged out, and a fairly uniform quality of gas is produced.

Is there any effect of weather/seasons in gas quality in gasifiers?

No, as long as the wood quality (moisture content, mainly) is maintained, the atmospheric conditions have negligible effect on the quality of gas generated.

Sailent features
  • Typical payback is within < 48 months
  • Fully Automated Gasification system & Burners
  • Very low maintenan- ce, No operative risk, easy to operate
  • Compact Foot Print
  • Multi Fuel systems
  • Dry Gas System
  • Zero Tar/ Effluent system
  • Highest Overall Efficiency
Img: illustration Biomas Gasification Technology - presentation in PDF

Zplyňování biomasy - gasifikace -brožůra v PDF