Question

If methane is burnt with 15% excess air, calculate
composition of flue gas mixture.​

Answer 1

Calculate (i) the weight of air needed for the combustion of 1 kg of fuel ; (ii) the volumetric composition of the products of combustion if 15 per ...

Answer 2

Explanation:

CLASSIFICATION OF FUELS

Fuels can be classified according to whether:

1. They occur in nature called primary fuels or are prepared called secondary fuels ;

2. They are in solid, liquid or gaseous state.

Atoms. It is not possible to divide the chemical elements indefinitely, and the smallest particle which can

take part in a chemical change is called an ‘atom’. If an atom is split as in nuclear reaction, the divided

atom does not retain the original chemical properties.

Molecules. It is rare to find elements to exist naturally as single atom. Some elements have atoms which

exist in pairs, each pair forming a molecule (e.g. oxygen), and the atoms of each molecule are held

together by stronger inter-atomic forces. The isolation of a molecule of oxygen would be tedious, but

possible; the isolation of an atom of oxygen would be a different prospect. The molecules of

some

substances are formed by the mating up of atoms of different elements. For example, water has a

molecule which consists of two atoms of hydrogen and one atom of oxygen. The atoms of different

elements have different masses and these values are important when a quantitative analysis is required.

The actual masses are infinitesimally small, and the ratios of the masses of atoms are used. These ratios

are indicated by atomic weight quoted on a scale which defines the atomic weight of oxygen as 16.