Elementary Principles of Chemical Processes, Binder Ready Version
4th Edition
ISBN: 9781118431221
Author: Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher: WILEY
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Chapter 9, Problem 9.67P
A coal contains 73.0 wt% C, 4.7% H (not including the hydrogen in the coal moisture), 3.7% S, 6.8% H2O, and 11.8% ash. The coal is burned at a rate of50,000 lbm/h in a power-plant boiler with air 50% in excess of that needed to oxidize all the carbon in the coal to CO2. The air and coal are both fed at 77°F and 1 atm. The solid residue from the furnace is analyzed and is found to contain 28.7 wt% C, 1.6% S, and the balance ash. The sulfur oxidized in the furnace is converted to SO2(g). Of the ash in the coal, 30% emerges in the solid residue and the balance is emitted with the stack gases as fly ash. The stack gas and solid residue emerge from the furnace at 600°F. The higher heating value of the coal is 18,000 Btu/lbm.
- Calculate the mass flow rates of all components in the stack gas and the volumetric flow rate of this gas. (Ignore the contribution of the fly ash in the latter calculation, and assume that the stack gas contains a negligible amount of CO.)
- Assume that the heat capacity of the solid furnace residue is 0.22 Btu/(lbm·°F), that of the stack gas is the heat capacity per unit mass of nitrogen, and 35% of the heat generated in the furnace is used to produce electricity. At what rate in MW is electricity produced?
- Calculate the ratio (heat transferred from the furnace )/(heating value of the fuel). Why is this ratio less than one?
- Suppose the air fed to the furnace were preheated rather than being fed at ambient temperature, but that every thing else (feed rates, outlet temperatures, and fractional coal conversion) were the same. What effect would this change have on the ratio calculated in Part (c)? Explain. Suggest an economical way in which this preheating might be accomplished. Exploratory Exercises—Research and Discover
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Students have asked these similar questions
A burning dump emits an estimated 1.5 kg/min of nitrogen dioxide (NO2 ). On a partlycloudy morning with a 2.5 m/s wind and temperature of 18°C, what is the concentrationof NO2 at a distance of 3.0 km directly downwind of the dump? Does this exceed theshort-term exposure limit for NO2 ? State your assumptions.
For each set of measurements below, calculate the Grubbs statistic, G, look up the appropriate
critical value of G from Table 4.6, and determine whether the Grubbs test supports discarding the
first value in the list at the 95% level of confidence.
a) 106.0, 165.0, 167.5, 170.5, 163.5, 170.7
(Geale -2.028; Gerit 1.822; yes, the Grubbs test supports discarding 106.0)
b) 214.8, 263.0, 229.9, 236.9, 221.8, 230.8, 241.1
c) 357.0, 309.3, 304.9, 314.8, 305.8, 295.3, 284.7, 299.5
TABLE 4-6
Critical values of G
for rejection of outlier
Number of
observations
otsulsve os
Tenos
nagsibarito G to buboxy
(95% confidence)
456
1.463
1.672
1.822
7
1.938
8 upa
2.032
9
2.110
10
2.176
- 1 12 15 20
11
2.234
2.285
2.409
2.557
#1 A irreversible isothermal gas-phase isomerization reaction is given as: AB. This reaction is
conducted in a 400L batch reactor and 100 mol of A (NAD = 100 mol) is charged into this reactor.
The rate of reaction is determined as a function of the conversion of reactant A and the results
are given below. The temperature was constant at 500K and the total pressure was constant at
830 kPa. The entering number of moles of species A is 100 mol. Calculate the time necessary to
achieve 80% conversion.
0
0.1
0.2
0.4
-TA (mol/m³.s)
0.45
0.37
0.3
0.195
0.6
0.113
0.7
0.079
0.8
0.05
Chapter 9 Solutions
Elementary Principles of Chemical Processes, Binder Ready Version
Ch. 9 - The standard heat of the reaction...Ch. 9 - Prob. 9.2PCh. 9 - Prob. 9.3PCh. 9 - The standard heat of the reaction...Ch. 9 - Prob. 9.5PCh. 9 - Prob. 9.6PCh. 9 - Prob. 9.7PCh. 9 - Prob. 9.8PCh. 9 - The standard heat of combustion of gaseous ethane...Ch. 9 - The standard heat of combustion (AH°) of liquid...
Ch. 9 - Prob. 9.11PCh. 9 - Prob. 9.12PCh. 9 - In the production of many microelectronic devices,...Ch. 9 - Prob. 9.14PCh. 9 - Prob. 9.15PCh. 9 - Prob. 9.16PCh. 9 - Prob. 9.17PCh. 9 - Carbon monoxide at 25°C and steam at 150°C are fed...Ch. 9 - Prob. 9.19PCh. 9 - Prob. 9.20PCh. 9 - Ethyl alcohol (ethanol) can be produced by the...Ch. 9 - Prob. 9.22PCh. 9 - Prob. 9.23PCh. 9 - Prob. 9.24PCh. 9 - Formaldehyde is produced commercially by the...Ch. 9 - Prob. 9.26PCh. 9 - Prob. 9.27PCh. 9 - Prob. 9.28PCh. 9 - Prob. 9.29PCh. 9 - A gas mixture containing 85 mole% methane and the...Ch. 9 - Ethylene oxide is produced by the catalytic...Ch. 9 - Cumene (C6H5C3H7) is produced by reacting benzene...Ch. 9 - Ethylbenzene is converted to styrene in the...Ch. 9 - Prob. 9.34PCh. 9 - Prob. 9.35PCh. 9 - Prob. 9.36PCh. 9 - Prob. 9.37PCh. 9 - Coke can be converted into CO—a fuel gas—in the...Ch. 9 - Prob. 9.39PCh. 9 - Prob. 9.40PCh. 9 - Prob. 9.41PCh. 9 - The equilibrium constant for the ethane...Ch. 9 - You are checking the performance of a reactor in...Ch. 9 - Hydrogen is produced in the steam reforming of...Ch. 9 - Prob. 9.45PCh. 9 - Five cubic meters of a 1.00-molar aqueous sulfuric...Ch. 9 - Prob. 9.47PCh. 9 - Prob. 9.48PCh. 9 - Prob. 9.49PCh. 9 - Calcium chloride is a salt used in a number of...Ch. 9 - A dilute aqueous solution of sulfuric acid at 25°C...Ch. 9 - A 2.00 mole% sulfuric acid solution is neutralized...Ch. 9 - A 12.0-molar solution of sodium hydroxide (SG =...Ch. 9 - Citric acid (C6H8O7) is used in the preparation of...Ch. 9 - Ammonia scrubbing is one of many processes for...Ch. 9 - Various uses for nitric acid are given in Problem...Ch. 9 - A natural gas is analyzed and found to consist of...Ch. 9 - Prob. 9.58PCh. 9 - A fuel gas is known to contain methane, ethane,...Ch. 9 - A fuel gas containing 85.0 mole% methane and the...Ch. 9 - A mixture of air and a fine spray of gasoline at...Ch. 9 - The heating value of a fuel oil is to be measured...Ch. 9 - Methanol vapor is burned with excess air in a...Ch. 9 - Methane at 25°C is burned in a boiler furnace with...Ch. 9 - Methane is burned completely with 40% excess air....Ch. 9 - A gaseous fuel containing methane and ethane is...Ch. 9 - A coal contains 73.0 wt% C, 4.7% H (not including...Ch. 9 - A mixture of methane, ethane, and argon at 25°C is...Ch. 9 - Prob. 9.69PCh. 9 - Prob. 9.70PCh. 9 - Prob. 9.71PCh. 9 - A bituminous coal is burned with air in a boiler...Ch. 9 - Prob. 9.73PCh. 9 - A natural gas containing 82.0 mole% CH4and the...Ch. 9 - Prob. 9.75PCh. 9 - Liquid n-pentane at 25°C is burned with 30% excess...Ch. 9 - Methane is burned with 25% excess air in a...Ch. 9 - Methane and 30% excess air are to be fed to a...Ch. 9 - Prob. 9.79PCh. 9 - In Problem 9.79, the synthesis of methanol from...Ch. 9 - Natural gas that contains methane, ethane, and...Ch. 9 - Prob. 9.82PCh. 9 - The wastewater treatment plant at the Ossabaw...
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