4.97. The analysis of a coal indicates 75 wt% C, 17% H, 2% S, and the balance noncombustible ash. The coal is burned at a rate of 5000 kg/h, and the feed rate of air to the furnace is 50 kmol/min. All of the ash and Problems 213 6% of the carbon in the fuel leave the furmace as a molten slag; the remainder of the carbon leaves in the stack gas as CO and CO,; the hydrogen in the coal is oxidized to water, and the sulfur emerges as SO,. The sclectivity of CO2 to CO production is 10:1. (a) Calculate the percent excess air fed to the reactor. ENTAL (b) Calculate the mole fractions of the gaseous pollutants-CO and SO,-in the stack gas. (c) Emitted sulfur dioxide by itself is a health hazard, but it is a more serious threat to the environment as a precursor to acid rain. Under the catalytic action of sunlight, the sulfur dioxide is oxidized to sulfur trioxide, which in turn combines with water vapor to form sulfuric acid, which eventually returns to earth as rainfall. Acid rain formed in this manner has caused extensive damage to forests, fields, and lakes in many parts of the world. For the furnace described above, calculate the rate of formation of sulfuric acid (kg/h) if all the emitted SO, is converted in the indicated manner. (d) Access http://www.epa.gov/airmarkets/quarterlytracking.html to find the quarterly ARP (Acid Rain Program) SO, emissions of U.S. coal-fired power plants. How many coal-fired power plants exist in a state where your father or mother grew up? What are the total annual tons of SO, emissions from those plants according to the most recent reporting data? If there are none in your first chosen state, pick a neighboring state.
4.97. The analysis of a coal indicates 75 wt% C, 17% H, 2% S, and the balance noncombustible ash. The coal is burned at a rate of 5000 kg/h, and the feed rate of air to the furnace is 50 kmol/min. All of the ash and Problems 213 6% of the carbon in the fuel leave the furmace as a molten slag; the remainder of the carbon leaves in the stack gas as CO and CO,; the hydrogen in the coal is oxidized to water, and the sulfur emerges as SO,. The sclectivity of CO2 to CO production is 10:1. (a) Calculate the percent excess air fed to the reactor. ENTAL (b) Calculate the mole fractions of the gaseous pollutants-CO and SO,-in the stack gas. (c) Emitted sulfur dioxide by itself is a health hazard, but it is a more serious threat to the environment as a precursor to acid rain. Under the catalytic action of sunlight, the sulfur dioxide is oxidized to sulfur trioxide, which in turn combines with water vapor to form sulfuric acid, which eventually returns to earth as rainfall. Acid rain formed in this manner has caused extensive damage to forests, fields, and lakes in many parts of the world. For the furnace described above, calculate the rate of formation of sulfuric acid (kg/h) if all the emitted SO, is converted in the indicated manner. (d) Access http://www.epa.gov/airmarkets/quarterlytracking.html to find the quarterly ARP (Acid Rain Program) SO, emissions of U.S. coal-fired power plants. How many coal-fired power plants exist in a state where your father or mother grew up? What are the total annual tons of SO, emissions from those plants according to the most recent reporting data? If there are none in your first chosen state, pick a neighboring state.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:4.97. The analysis of a coal indicates 75 wt% C, 17% H, 2% S, and the balance noncombustible ash. The coal
is burned at a rate of 5000 kg/h, and the feed rate of air to the furnace is 50 kmol/min. All of the ash and
Problems 213
6% of the carbon in the fuel leave the furmace as a molten slag; the remainder of the carbon leaves in the
stack gas as CO and CO,; the hydrogen in the coal is oxidized to water, and the sulfur emerges as SO,.
The sclectivity of CO2 to CO production is 10:1.
(a) Calculate the percent excess air fed to the reactor.
ENTAL
(b) Calculate the mole fractions of the gaseous pollutants-CO and SO,-in the stack gas.
(c) Emitted sulfur dioxide by itself is a health hazard, but it is a more serious threat to the
environment as a precursor to acid rain. Under the catalytic action of sunlight, the sulfur
dioxide is oxidized to sulfur trioxide, which in turn combines with water vapor to form sulfuric
acid, which eventually returns to earth as rainfall. Acid rain formed in this manner has caused
extensive damage to forests, fields, and lakes in many parts of the world. For the furnace
described above, calculate the rate of formation of sulfuric acid (kg/h) if all the emitted SO, is
converted in the indicated manner.
(d) Access http://www.epa.gov/airmarkets/quarterlytracking.html to find the quarterly ARP (Acid
Rain Program) SO, emissions of U.S. coal-fired power plants. How many coal-fired power plants
exist in a state where your father or mother grew up? What are the total annual tons of SO,
emissions from those plants according to the most recent reporting data? If there are none in your
first chosen state, pick a neighboring state.
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