Our company INTRAVIS s.r.o. is a result of 3 year cooperation between Chanderpur Works, Pvt LTD (INDIA) and engineering company D&T Solutions, s.r.o (SLOVAKIA). Currently we are supporting supply of several plants to Slovakia. Our mutual cooperation resulted in creation of Joint-Venture, INTRAVIS s.r.o, who is THE partner for complete gasification system on turnkey basis in EU market.

All our projects use technology from our partner, Chanderpur Works PVT. LTD, who has supplied couple dozen gasifiers globally. Engineering part is done by D&T Solutions, s.r.o who specialize in pyrolysis, gasification and engine-based-cogeneration-units engineering and ensures that designed solution meets strict European standards from technical, safety and emission standpoint.

Green solution by gasification

Chanderpur group with its 50+ years of manufacturing experience has developed new modular line of gasifiers suitable for European market.

Our gasifier, present an economical and eco- friendly solution to convert woody biomass /agricultural wastes like coconut waste, rice-husk etc. into a combustible gas that can be further used in a number of applications to replace tradiotional LPG, Diesel or any other petro-fuel usage.

Producer gas is free of Sulfur, has no emmission except gas generator that is equivalent to natural gas, generates Zero effluent and generates no solid waste (all byproducts are selables)

Gasifiers types

Fixed Bed Biomass Gasifier

In which you can use woody biomass, briquettes of loose biomass. Gas generated by this fixed bed gasifier is clean and suitable for power generation as well as for thermal applications where clean gas is required.

Fixed Bed Biomass Gasifier

In which you can use Coal, Charcoal, briquettes of loose biomass. Gas generated by this fixed bed gasifier is not very clean and suitable only for thermal applications.

Fluidized Bed Gasifier

In fluidized bed gasifier you can use rice husk, wheat husk or any other loose biomass as it is.

Difference between updraft and downdraft gasifier :

Updraft Gasifier:

  • It can run on higher moisture i.e. up to 20%
  • It is a multi-fuel system
  • It can work on briquettes, coal and other fuels
  • It has easy removal of ash, so it can take the raw material which contains high ash material such as coal
  • The disadvantage of updraft gasifier is that the quality of gas is comparatively low as it is having high tar and particulate matter

Downdraft Gasifier:

  • Due to high quality gas, it is suitable for power applications.
  • It is also suitable for the thermal applications where high quality of gas is required.
  • It can only undertake woody biomass & charcoal and the material should be low ash content, having low moisture and should not cripple under heat.
  • For big size gasifiers, size is a limitation in case of downdraft gasifier. We generally supply downdraft gasifier for replacement of Furnace Oil upto 400 liters.

Description of gasification process

Feeding and gasification​

The prepared wood chip is brought by bucket elevator into the gasification reactor, where it is gradually gasified. The biomass is automatically loaded into the gasificator through a double shutter. Controlled amounts of air are brought into the gasification reactor, and this makes the whole process markedly different from combustion. One kilogram of biomass is turned into 2,5 – 3,0 Nm3 of gas. The gasification of biomass is a process of converting carbon-based solid fuels into a flammable mixture of gases called syngas (synthesis gas), in our case wood gas. The gasification runs during a limited access of air in temperatures between 700 and 1200°C. The basic advantage is the high conversion efficiency of even less-quality fuel and heat. The whole process is eco-friendly and runs in a closed cycle.

Cooling and purification of the gas​​

The hot raw gas is cooled and perfectly purified – rid of unwanted substances and solid particles, to fulfill strict limits of pureness for the gas motorgenerator CU (cogeneration unit). After leaving the gasification reactor, the raw gas enters the cyclone, the Venturi washer, where it is deprived of thick impurities. Subsequently the gas is led through a blower to a tar catcher, then into series of filters (coarse, fine and fabric). From there the gas is ridden of the absolute humidity inside a condensation cooler, and before entering the motor, the gas has to be mildly warmed, in order to lower its relative humidity.

Gas combustion inside the cogeneration unit​

In the machine room a gas motorgenerator, which is piston combustion engine that makes electricity (3×400 V, 50 Hz) from the wood gas through a connected electrical generator. The heat is formed by a natural running of the motor inside the cooling circuit and in the flue gas heat exchanger. The electrical efficiency according to the producer is 35 % and including thermal efficiency it exceeds 87% overal efficiency. The produced electricity will cover the plant’s own consumption, and the whole production will be driven out through the main switchgear and a substation into the distribution network 22 kV. The produced heat is returned into the gasification cycle with a high efficiency of the whole process. The heat is available during the wood ship drying and for another commercial use.

Wood gas composition​

The synthetic gas (wood gas) from the gasification unit is a low calorific gas composed mainly of CO, H2, CH4, CO2, N2, and with the calorific value est. 5,8 MJ/m3. It is characterized by excellent antiknock properties, so it is possible to use gas engines with a higher compression ratio, and therefore with a higher efficiency. The gas is very well purified before being used in the motorgenerator (Mtar < 10mg/m3, Mdust < 5 mg/m3), what ensures a long-lasting operation of the motorgenerator.

Wooden ash (biochar)

Only a negligible amount of charcoal in the form of an ash leaves the whole gasification process, what is approximately 3- 5% of the input fuel mass. This biochar has good characteristics and can be used as a sellable


  • High efficiency when converting energy in fuel into usable power – over 21% overall efficiency towards generating electrcity (ORC systems or steam turbines have usually up to 15%)
  • Low emission system as there is no burning occuring and is is at the CNG/natural gas levels
  • Variability of output .. very fats reaction to changing power demands (efficient operation from 60% of designed capacity)
  • Fuel variability – eventhough we consider woodchips systems can be adjusted to almost any biomass fuel given that fuel parametres are known
  • Fully automated solution with one operator/controler in the operations room

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