Question

air. Both CO (except in small amounts) and excess O2 should not be present together Presence of CO and O2 together indicates non-uniform combustion i. e., excess air is being sent in, and in certain part of the furnace there is insufficient supply of air. If sulphur i present in the fuel, SO2 will be produced which will be dissolved in water over which gas is collected and will not be recorded by this method. The results help to make importan calculations as shown in the following examples. In smaller plants the facility of ultimate analysis is not available but Orsat apparatus which is not expensive, is available. With some practice and due care one should be able t get good results which can indicate the approximate combustion state. This is satisfactory fo most purposes. More accurate results are, however, obtained by detailed analysis an calculations. The following example illustrates the method of calculation. Example 6 804% Calcul t A sample of flue gas has the following analysis CO2 12.5%。71% N the excess air supplied

Answer 1

Please refer the following image for the solution.

80.4 2 Based on composih'on fa alu フg mole of N2 and 2.1 mole of O2 Therefore, O2 enten in, the bun men. = 80.9メ21-21.37 79 duce imole of Co2 y doc a bor ,"u cu叉=[21.37-(12-St. ).77) ッ0 e).cos