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+//clc()

+N = 100;//mol flue gas

+//Carbon balance,

+//x is the feed of methane, w is water in flue ga, y is the oxygen supplied

+xco2 = 0.019;

+xch2o = 0.117;

+xo2 = 0.038;

+xch4 = 0.826;

+xc = xco2 + xch2o + xch4;

+Nc = xc * N;

+Nch4i = Nc;

+//Hydrogen balance,

+xh2 = xch2o + xch4*2;

+w = 2 * (Nch4i) - xh2*N;

+//oxygen balance

+No2s = (xco2 + xch2o/2 + xo2)*N + w/2;

+y = No2s;

+T1 = 298;//K

+T2 = 573;//K

+T3 = 673;//K

+//oxygen cooled from 573K and methane from 673 to 298K 

+Ho573 = 30.5;//J/molK

+Hch4673 = 45.9;//J/molK

+H1 = y * Ho573 * (T1 - T2) + Nch4i * Hch4673 * (T1 - T3);

+//CH4 + O2 = CH2O + H2O        Hr1 = -282.926kJ

+//CH4 + 2O2 = CO2 + 2H2O       Hr2 = -802.372kJ

+Hr1 = -282.926;//kJ

+Hr2 = -802.372;//kJ

+H2 = xch2o*N*Hr1 + xco2*N*Hr2;

+T4 = 873;//K

+Ho = 31.9

+Hch4 = 51.4;

+Hco2 = 46.3;

+Hch2o = 47.1;

+Hh2o = 36.3;

+H3 = ((xco2 * Hco2 + xo2 * Ho + xch4 * Hch4 + Hch2o*xch2o)*N + w * Hh2o)*(T4 - T1);

+Htotal = H1/1000 + H2 + H3/1000;

+Nch2o = xch2o * N;

+mch2o = Nch2o * 30.016/1000;//kg

+//for 1000 kg of formaldehyde produced,

+H = Htotal * 1000 / mch2o;

+disp("kJ",H,"The amount of heat to be removed per 1000kg of formaldehyde produced = ")
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