We offer Turnkey solutions for Biogas to Power. Under a collaboration of M/s Biogasclean of Denmark,we manufacture and supply Hydrogen Sulphide Removal System. Biogas from Distillery, STP, Starch, Dairies, and Other Effluents can be up-graded to produce more revenue by direct burning in a gas engine as compared to going through the traditional Rankine cycle- Boiler - Turbine route..
The major components required to put up a complete power from bio gas unit are as follows:
Bio gas generated from bio methanation of effluent from distillery etc. is usually burnt in a boiler for generation of steam which is then expanded in a turbine coupled to an alternator to generate power in a steam based Rankine cycle, where a large percentage of the thermal energy is wasted. The net recoverable electrical energy is about 15-18%.
A much more efficient route for harnessing this energy into generation of power is to condition this bio gas (strip it of H2S) and burn it in an IC engine, the electrical output being 40%. Along with this about 25% low grade thermal energy can be recovered using suitable heat exchangers as waste heat recovery from the engine flue gasses and its hot water circuit.
Electricity generated could be used for captive use or sold to SEB or in the open market under open access. One can sell a minimum of 1mwe/h. With the increasing power tariffs the payback of this system is around 3 years. Along with this if the CDM benefits are taken-the ROI will be even more attractive.
Bio gas is primarily a mixture of methane (CH4), inert carbonic gas (CO2), H2S and other trace gases. The name “bio gas” gathers owing to its production through microbiological organism. Different sources of production lead to different specific compositions resulting from specific treatment processes, starting from various organic waste - industries, animal or domestic origin waste etc. The composition of bio gas generated from a digested depends on the substrate, of its organic matter load and the feeding rate of the digester.
Hydrogen sulfide is a highly toxic, corrosive and larger pollutant gas. The presence of H2S, make bio gas very corrosive. The burning of the gas releases sulfur dioxide which is also a corrosive and toxic gas. Removal of this gas from bio gas is essential not only for pollution abatement but also for effective use of bio gas for end use application like power generation in IC engines
The presence of hydrogen sulfide at higher concentration corrodes the internal parts of the bio gas engines. So, the hydrogen sulfide concentration is brought down to a level acceptable to Engine manufacturers. Acceptable level of H2S for IC engine application dependent on individual engine manufacturer, but lower the level better is the life of the Bio gas engine.
Power from Bio gas