Question

Mention five factors that should be considered while choosing an ideal fuel. Write the constituents of biogas

Answer 1

1) The fuel should have high calorific value.

(2) The ignition temperature should be moderate, neither too high nor too low.

(3) It should have moderate rate of combustion.

(4) It should be readily available and should be economical.

Biogas is usually made up of around 50-70% methane (CH4) and 25-45% carbon dioxide (CO2), with other gases such as hydrogen (H2), hydrogen sulphide (H2S), water vapor (H2O), nitrogen (N2), oxygen (O2), ammonia (NH3) making up the rest.

Answer 2

The main factors in the production of biogas have been identified as:

1) Sublayer composition;

2) Temperature inside the digester;

3) Retention time;

4) Working pressure of the digester;

5) Fermentation medium pH; 6) Volatile fatty acids (VFA)

constitients of bio gas :-

This type of gas is also comprised primarily of nitrogen, hydrogen, and carbon monoxide, with trace amounts of methane. The gases methane, hydrogen and carbon monoxide can be combusted or oxidised with oxygen. Air contains 21 per cent oxygen. This energy release allows biogas to be used as a fuel.