The newest method for energy generation is known as gasification. This method captures 65-70% of the energy present in solid fuels by first converting it to combustible gases. These gases are then burned, like we currently burn natural gas, to create energy. AESI utilizes gasification technology on every energy project we design.
The essence of gasification process is the conversion of solid carbon fuels into carbon monoxide by thermochemical process. The gasification of solid fuel is accomplished in closed chamber, under slight suction or pressure relative to ambient pressure. Gasification is quite complex thermochemical process. Splitting of the gasifier into strictly separate zones is not realistic, but nevertheless conceptually essential. Gasification stages occurs at the same time in different parts of gasifier.
In reduction zone, a number of high temperature chemical reactions take place in the absence of oxygen. The principal reactions that take place in reduction are mentioned below.
Boudouard reaction CO2 + C = 2 CO - 172.6 [MJ/kmol]
Water-gas reaction C + H2O = CO + H2 - 131.4 [MJ/kmol]
Water shift reaction CO2 + H2 = CO + H2O + 41.2 [MJ/kmol]
Methane production reaction C + 2 H2 = CH4 + 75 [MJ/kmol]
Main reactions show that heat is required during the reduction process.Hence, the temperature of gas goes down during this stage. If complete gasification takes place, all the carbon is burned or reduced to carbon monoxide, a combustible gas and some other mineral matter is vaporized. The remains are ash unless the unit partially consumes the carbon thereby producing char, a byproduct of incomplete combustion.