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Combustion Exercises: Chemical Engineering Problems, Lecture notes of Process Control

Process Calculations Lecture notes in Chemical engineering

Typology: Lecture notes

2021/2022

Available from 08/30/2023

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Combustion exercise:
7. The exit gas from a phosphate reduction furnace analyses P4: 8%, CO : 89%,
N2: 3%. This gas is burnt with air under conditions selectively to oxidise
phosphorus. From the flue gas, the oxides of P precipitate on cooling and is
separated from the remaining gas. Analysis of latter shows CO2: 0.9%, CO :
22.5%, N2: 68% and O2: 8.6%. Assume oxidation of P is complete and that P
exists in the flue gas partly as P4O6and partly as P4O10. Calculate the following
(a) % of CO entering the furnace that is oxidised to CO2(b) % of P4that is
oxidised to P4O10.
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  1. The exit gas from a phosphate reduction furnace analyses P 4 : 8%, CO : 89%, N 2 : 3%. This gas is burnt with air under conditions selectively to oxidise phosphorus. From the flue gas, the oxides of P precipitate on cooling and is separated from the remaining gas. Analysis of latter shows CO 2 : 0.9%, CO : 22.5%, N 2 : 68% and O 2 : 8.6%. Assume oxidation of P is complete and that P exists in the flue gas partly as P 4 O 6 and partly as P 4 O 10. Calculate the following (a) % of CO entering the furnace that is oxidised to CO 2 (b) % of P 4 that is oxidised to P 4 O 10.

Contd…..

  1. A producer gas contains CO 2 -9.2%, C 2 H 4 -0.4%, CO-20.9%, H 2 -15.6%, CH 4 - 1.9%, N 2 -52%. When it is burnt, a product of combustion is found to contain CO 2 - 10.8%, CO-0.4%, O 2 -9.2%, N 2 -79.6%. Calculate the following (a) m 3 of air used per m 3 of producer gas (b) % excess air (c) % N 2 that has from producer gas