Compressed Biogas Cylinder

Compressed Biogas Cylinder: Eco-friendly and Economy-friendly
In present era of ever increasing energy consumption and dwindling fossil fuel reserves, the importance of biomass based, decentralized fuels such as Biogas and Biomass based generation has greatly increased. As for as current scenario of countries like India is concerned situation will be more horrible if renewable energy sources are not being brought in practice.
Biogas:
Biogas comprises of 60-65% methane, 35-40 % carbon dioxide, 0.5-1.0 % hydrogen sulfide and water vapour. It is almost 20% lighter than air. Like Liquefied Petroleum Gas (LPG) it cannot be converted to liquid state under normal temperature. Removing carbon dioxide and compressing it into cylinders makes it easily usable for transport applications, say three wheelers, cars, pick up vans etc and also for stationary applications at Biogas run CAR various long distances. Already, CNG technology has become easily available and therefore, bio-methane (enriched biogas) which is nearly same as CNG, can be used for all applications for which CNG are used. Biogas enrichment process A variety of processes are available for enrichment i.e. removing CO2, H2S and water vapour. Commonly CO2 removal processes also remove H2S. One of the easiest and cheapest methods involved is the use of pressurized water as an absorbent liquid. In this method, biogas is pressurized and fed to the bottom of a scrubber column where water is sprayed from the top. In counter-currently operated absorption process, the carbon dioxide and hydrogen sulfide present in the biogas is absorbed in down going water and methane goes up and is collected in vessel. However, water requirement in this process is high but it is the simplest method of removing impurities from biogas. Concept of alternative Bio-CNG Biogas contains a large proportion (about 40 % by volume) of carbon dioxide, a heavier and non combustible gas and some fraction of hydrogen sulphide. Hence it is needed to enrich biogas by removing these undesirable gases to save compression energy and space in bottle and corroding effect, which can be done by scrubbing. The scrubbing system is found to enrich methane about 95 % or more depending upon biogas inlet and water injection pressure. Biogas can be used for all applications designed for natural gas, assuming sufficient purification. Scope of the technology Enriched biogas is made moisture free by passing it through filters, after which it is compressed up to 200 bar pressure using a three stage gas compressor. Compressed gas is stored in high pressure steel cylinders as used for CNG. There is large potential of this technology in buses, tractors, cars, auto rickshaws, irrigation pump sets and in rural industries. This will help to meet our energy demand for rural masses thus reducing Biogas Scrubber burden of petroleum demand, moving towards energy security and will improve economic status by creating employment generation in rural areas.India may use its vast organic wastes to produce compressed biogas (CBG), which will supplement CNG. While technology to enrichment and compress biogas has already been devised, it will not be too long before our cars start running on CBG. Biogas consists of 60% methane and 40% carbon dioxide. This biogas can be purified (upto 96% of Methane) to match CNG standards.