Biogas Cleaning
Need of Biogas Desulphurization
The hydrogen sulphide (H2S) content in raw biogas depends both on organic substrate or waste, and previous production process (sugar refineries, distilleries, breweries). The H2S value typically ranges from 0.05 to 5.0% (500-50,000 ppm). During combustion, the H2S is oxidised to corrosive oxides of sulphur. Under the presence of condensate, sulphuric acid (H2SO4) is formed. The result is the heavy corrosion of gas-engine and auxiliary equipment. The lifetime of gas-engines is shortened by several years under that process!
As a consequence of the frequent exchange of engine oils, technical inspections, failures and subsequent repairs, there is a significant reduction of the investor’s profit. That is also the reason why leading manufacturers of gas engines require, as a condition for the full engine warranty, that the value of H2S in combusted biogas does not exceed 250 ppm. When necessary, the H2S content can be decreased to markedly lower values by BioGasclean technology.
Desulphurization Using BioGasclean Technology
NovaEnergo supplies a full range of biological desulphurization BioGasclean systems for hydrogen sulphide removal; from small gas cleaners to the largest gas cleaners at sugar cane ethanol distilleries. The gas cleaners can be designed to handle any biogas flow and H2S content in the raw biogas. They can be installed in new as well as existing biogas plants. BioGasclean’s desulphurization technology is biological. This gives very low operational costs as the gas cleaners do not consume caustic soda or similar chemicals. The only residual product from the process is a valuable fertiliser. Therefore, a gas cleaner from BioGasclean is not only economically but also environmentally a good investment.
Desulphurization Using Activated Carbon
Very low concentrations of hydrogen sulphide (H2S < 10 ppm) are usualy achieved by adsorption on activated carbon. NovaEnergo supplies a wide range of dust-free formulations of activated carbon designed for gas cleaning and purification. The service portfolio also covers sale/rental of mobile adsorber units for biogas desulphurization in different sizes, filling, discharging and sieving of activated carbon. Consulting in application technology are further essential parts of NovaEnergo's services.
More information
BioGasclean technology (pdf, 490 kB)
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