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FREQUENTLY ASKED QUESTIONS

V. GB Gasifired - Vergassen Gasifier - Special Features

Producer gas, the mixture of carbon monoxide, hydrogen, methane and other gases, may be hazardous, if it is not handled and used properly. Poisonous component of producer gas is carbon monoxide. All hazards associated with use of producer gas are described here.



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Fire hazards

Fire risks have been minimized by taking following precautions

Fire Risk causes Precautions taken
High surface temperature Insulation of hot parts of system
Sparks during Re-fuelling Use of double sluice filling device
Backfiring from nozzles Installation of nozzle covers

Explosion hazards

Explosion can occur if the producer gas is mixed with sufficient amount of air to form explosive mixture. This problem is relevant in case of gasifiers with large filters where considerable quantity of gas is stored. Our systems are specially designed to minimize these risks. In our design, gas is never stored and so the probability of explosions is eliminated.
Other possible reasons for mild explosions are:

Mild Explosion Risk causes Precautions taken
Air penetration during Re-fuelling Use of double sluice filling device to minimize air ingress
Air leakage into cold gasifier still containing
gas which can ignite
Ventilate cold system before igniting the fuel

Toxic hazards

Producer gas consists of carbon monoxide, which is slightly toxic as it combines with hemoglobin in the blood, preventing oxygen absorption and distribution. Carbon monoxide concentration of 50 PPM produces no effect. As concentration increases, there arise problems of headache and dizziness. No chronic symptoms can occur as the result of prolonged inhalation of relatively small amounts of carbon monoxide. Fortunately, there is less chance of gas escape during operation as gasification system works under suction. However, situation is quite different during starting and closing installations. To avoid the trapping of gas, it is recommended to install the gasifier plant in the open air or well ventilated areas.

Environmental hazards (Effluent Generation)

During the gasification of biomass, ashes and condensate (mainly water) are produced.

Solid Effluents

Ashes and dust (inert mineral matter) do not contribute to any environmental hazards and can be safely disposed. The ash generation varies with the feed stock but in general is less than 6% for most woods.

Liquid Effluents

The GB Gasifired - Vergassen has minimal water consumption. The water is mainly used for purpose of gas sealing only. The water gets contaminated with a bit of mineral matter during the process and has to changed periodically (every fortnight).

The GB Gasifired - Vergassen does not incorporate water based gas cooling and hence the typical problems related to tar condensation, water contamination by tar and its disposal do not arise.

Gaseous Effluents

Typical Emission Composition of producer gas

Nitrogen 70%
Oxygen 6%
CO2 14%
H2O 9%
Other 1%
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