Coal gasification consists of the chemical transformation of solid coal into gas. The heating values of coal differ, but the higher the heating value, the higher the value of the gas produced (which is essentially methane, carbon monoxide, hydrogen, etc.). The following coal has a reported heating value of 29,770 KJ/Kg as received. Assuming that this is the gross heating value, calculate the net heating value. ComponentPercentH2N271.05.61.6Net S2.7Ash6.113.0Total100.0

Given data: Gross heating of fuel = 29770 kJ/kg The composition of cola is given as: C = 71 % H2 =5.6 % N2 = 1.6 % Net S = 2.7 % Ash = 6.1 % O2 = 13 %The solid coal is transformed into gas. Heating value of a fuel is the amount of heat released when fuel is burnt in the presence of oxygen. The gross heating value is also known as the higher heating value and the net heating value is also known as the lower heating value. The net heating value from the higher heating value and the composition of coal is calculated as follows: NHV = HCV - 0.212 H - 0.0245 M - 0.008 A .............. (1) Where, NCV represents the net heating value. HCV represents the gross heating value. H represents the percentage composition of hydrogen in the coal. M represents the percentage composition of moisture in the coal. A represents the percentage composition of oxygen in the coal. Since the percentage composition in the fuel is not given. Therefore the M becomes equal to zero. HCV = 29.770 MJ/kg H = 5.6 % M = 0 A = 13 % Plugin the values in equation (1) NHV = 29.770 MJkg - 0.212 ×5.6 - 0.0245×0- 0.008 × 13NHV = 29.770 MJkg -1.1872 - 0- 0.104NHV = 28.4788 MJkgorNHV = 28478.8 kJkg Thus the net heating value becomes 28478.8 kJ/kg.