# PA4 - Department of Civil and Environmental Engineering...

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Department of Civil and Environmental Engineering Carleton University ENVE 2001, Winter 2016 Problem Analysis #4 (February 10) Problem 1. Mass balance involving reactions The combustion of coal generates energy (in form of heat), but also generates air and solid contaminants such as CO 2 , SO 2 , and ash. In this problem, 3059 kg/min of coal is being burned with 40% excess air (air composition: 21% O 2 , 79% N 2 ). The coal consists of 65% C, 4% H, 1.6% O, 0.7% N, 1.7% S, 20% moisture, 7% ash (the percent numbers are weight percent). The combustion converts C into CO 2 , H into H 2 O, S into SO 2 , N into N 2 . Additionally, all the O in the coal is used up in the combustion reactions, and the ash leaves as solid from the bottom of the combustor. a. Determine the flowrate (in mole/min) of all the components in the combustion gases. b. Determine the volumetric flow rate of combustion gases in m 3 /min under standard temperature and pressure. Problem 2. Mass balance, stoichiometry, and air pollution A bituminous coal has the following effective chemical formula: CH 0.823

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