Question

furnace uses a producer gas of the following analysis 5.3% CO2, 21.1% CO, 15.3% H2, 1.0% CH4 and 57.3%
N2. The flue gases contain14,1% CO2, 2.3% O2 and 83.6% N2. Calculate the percentage air used for combustion.

Answer 1

Solution - r Given that nolar Compolation of producer gas. Baris i 100 mol of producer gas. Blocks Diagrams 600 mot producergas C%- 5,300 C6 - 15/3 mol/ H2- mol Hy-572 Flue gaspi 100 mol producergas & CO2 - 5.2 mol co - 21.1 mol L HQ - 15.3 mol CHu -I mol No - 53.3 mol Furnace CO2 - 14.1 moty Tair - 2.3 moty 02-0.21 N2 - 83.6% No-0.79 O₂ balance - of amaunt O₂ for requirede Complete combution , O₂ Required for com e cott 20 co, I nolcon require 1/2 mb 02 - 21.1 no col molo =) moles of O₂ required =- Timolco lang = 10.55 molo O2 Required for H₂. Converein, → H2o. 1. moles of a required, a - 15.3 mokity kmolo, inte n = 7.65 nola Het E

moles of a for metheane Combustion 5. CHu + 204 - C + 2H2O Oq require - ind til 2 mit 12 lune - Timoletta = 2 mol O₂ Total Oq required = 10.55+7.65 +2 = 20.2 mol. 2012 mola Air require = I mol Air - 10.21 mol abg bnou 96. !9 mot Air. Die Co balance on i l Co in flue gas = Co in fuel & Copformed EQ in fuel = 15.3 mot cą formed = co, from co tcą from the o 211 mot Col I not cold and co, from co= Tinoco to R = 211 millor too CO₂ from City - Inol &Hi nolco.. T imol site i mol CO2 B flue. - Co, in paducer gas - 5.3+21.1+1. --27.4 mot. may a flue gas in or dry bats = 27.4 mt Collomol Plut oluingh - 194.36 mol flue gat

moles of į out = 194.36 not flue gay 0.623 molą . Inol flue gas = 4.469 mol O₂ => % excus Air supplied - Cair fed) - air requated - X100 air required air our extra air flue gas fed = air required t mol of Air molo air in flue gas = no a I nolof Oz 4,469 4 i mol of Air I nol 0.21 molo = 21.28 molair air fed = 96,19 mol + 21:28 = 117.47 mod. (117.47 mb)-(96.19) n41 - X100 =) % excess Air = 96.29 nol = 22.12%