Gas substation:

A fuel may be defined as the substance which on burning produce large amount of heat energy. There are many kinds of fuels such as solid fuels (coal), liquid fuels (diesel oil, furnace oil) and gaseous fuel (Natural gas-CH₄). Among them the gaseous fuel.

Natural Gas Supplied by  Gas Transmission & Distribution Co. Ltd.. To control and maintain the gas flow a gas substation is very necessary. Gas is supplied about 30-35 bar. This gas is reduced at a pressure of 4.2 bars.

 

                                                        

                                                             Figure: Gas substation

Valves:

1.      Axial flow gas control valve: It is used to control the axial flow when plant shut down.

2.      Shut off valve: These valves are used to control pressure of the gas.

Combustion:

           

Combustion of any fuel may be defined as a chemical combination of oxygen in the atmospheric air and hydro-carbons. Various kinds of reactions take place which are described in below:

                                    2H₂ + O₂ = 2H₂O

                                    CH₄ + 2O₂ = 2H₂O + CO₂

                                    2CO +O₂ = 2CO

                                    C₂H₄ + 3O₂ = 2CO₂ + 2H₂O