CBG

Green energy (Bio-CNG) is effectively used to replace CNG as an automotive fuel (for CNG buses and tractors) and LPG for cooking purposes, as well as to power street lights. The Bio-CNG plant converts 100% of the eight tons of food and kitchen waste generated daily in the city into 1000 m3 of raw biogas. This raw biogas can be enriched to yield 400kg/day of purified CNG grade fuel which is equivalent to a 200kW power plant. As a by-product, four tons of organic fertilizers are produced each day.

Biogas comprises of 60-65% methane, 35-40% carbon dioxide, 0.5-1.0% hydrogen sulphide, rests of water vapors etc. Biogas is non-toxic, color less and flammable gas. It has an ignition temperature of 650 - 7500C. Its density is 1.214kg/ m3 (assuming about 60% Methane and 40% CO2). Its calorific value is 20 MJ/m3 (or 4700 kcal.). It is almost 20% lighter than air. Biogas, like Liquefied Petroleum Gas (LPG) cannot be converted into liquid state under normal temperature and pressure.

It liquefies at a pressure of about 47.4 Kg/cm2 at a critical temperature of -82.10c. Removing carbon dioxide, Hydrogen Sulfide, moisture and compressing it into cylinders makes it easily usable for transport applications & also for stationary applications.

Already CNG technology has become easily available and therefore, bio-methane (purified biogas) which is nearly same as CNG, can be used for all applications for which CNG are used. Purified biogas (biomethane) has a high calorific value in comparison to raw biogas.