A fuel containing 80% CH4 and 20% C2H6 is burned with dry air. Sixty percent of the carbon burned goes to CO2, the rest going to CO. Fifty percent excess air is used. Calculate the number of moles of each constituents of the wet flue gas produced by combustion of 100 mole of fuel gas, and also the Orsat analysis of the flue gas.

A fuel containing 80% CH4 and 20% C2H6 is burned with dry air. Sixty percent of the carbon burned goes to CO2, the rest going to CO. Fifty percent excess air is used. Calculate the number of moles of each constituents of the wet flue gas produced by combustion of 100 mole of fuel gas, and also the Orsat analysis of the flue gas.

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter26: Biodiesel

Section: Chapter Questions

Problem 3Q

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(a) A commercial 737 jet transporting 143 passengers and 5 crew members from Kansas City (MCI) to Baltimore (BWI) burned 11,800 lb (about 1700 gallons) of Jet A fuel en route. Jet A fuel is kerosine based, consisting primarily of CnH2n+2 hydrocarbons, with n =6 to 16, so the carbon:hydrogen ratio is close to 1:2. During this flight, how much CO2 was released into the atmosphere? Assume the combustion of the fuel was complete, so all the fuel was burned to form CO2 and H2O. Give both the mass of CO2 produced (in kg and in lbs) and the volume it would occupy at 298 K, 1 atm.(b) How much CO2 would be released into the atmosphere if those passengers and crew made the trip instead, in pairs, in hybrid cars at 40 miles per gallon. Assume the density of the gasoline is 0.75 kg L-1 and that carbon and hydrogen dominate the composition in a ratio of 1:2. The road trip is 1082 miles.
Calculate the volume of air required for complete combustion of 1m3 of a gaseous fuel having the composition: CO = 46%; CH4 = 10%; H2 = 40%; C2H2 = 2%; N2 = 1% and the remaining being CO2.
A gaseous fuel contains by volume:CO2 = 2.6 % ,CO = 6 %, O2= O.6 % ,N2= 3.66 % ,H2= 48.0%CH4= 34 %, C2H4=5.2 %Calculate the minimum volume of air required for complete combustion of 100 m3 of the gas. If 50 % excess air is supplied, find the volume of each of the dry constituents of the flue gas.
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A fuel containing 75% ethane and 25% propane is burned with dry air. All the H2 burns to H2O and the CO2 to CO ratio is 11:1. 20% excess air is supplied. Calculate:a. Mole flue gas/100 moles of fuel b. Orsat analysis of the flue gas c. Complete analysis of the flue gas d. m3 dry air at 28 °C, 765 mmHg per kmol fuel
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Consider a simple mass balance model where 100 CO2 molecules are released into the atmosphere from burning fossil fuels. Half of these molecules are immediately absorbed by the terrestrial biosphere and ocean: fraction f goes to the biosphere and fraction 1-f dissolves into the ocean. Assume fossil fuel combustion consumes 1.4 molecules of O2 for every molecule of CO2 produces and photosynthesis produces 1.1 molecules of O2 for every molecule of CO2 consumed. If the observed change in oxygen is a decrease of 110 molecules, what fraction of the CO2 was absorbed by the ocean.
4a Assume that worldwide combustion of fossil fuel accounts for an energy use of 500 x 1015 kJ/year. Also, assume that all fossil fuels can be represented by the formula C3H5 with energy content of 32,500 kJ/kg.Finally, assume that air is 79% N2 and 21% O2 , and has a molecular weight of 29 kg/kmol. i. Estimate the annual release of CO2 to the atmosphere by burning fossil fuels, in kg/yr ii. If all that CO2 entered the atmosphere (and none was removed), estimate the increase in atmospheric concentration, in ppm by volume. Assume the atmosphere contains 6.7 x 1018 kg of air.
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