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1. The corrected ultimate analysis shows 5.6% hydrogen on the as-received basis. Basis: 100 kg of coal as received The water formed on combustion is 5.6 kg Ha 1 kg mol H; | 1 kg mol H2O 2.02 kg Hz 18 kg H,O 1 kg mol H2 | 1 kg mol H,O 49.9 kg H20 The energy required to evaporate the water is 49.9 kg H,O | 2370 kJ _ 1183 kJ 100 kg coal | kg H20 kg coal The net heating value is 29,770 – 1183 = 28,587 kJ/kg The valuc 2370 kJ/kg is not the latent heat of vaporization of water at 25°C (2440 kJ/kg) but includes the effect of a change from a heating value at constant volume to one at constant pressure (-70 kJ/kg) as described in a later section of this chapter. Use the Dulong formulate to calculate the HHV of this coal. Do you get 30,000 kJ/kg?

1. The corrected ultimate analysis shows 5.6% hydrogen on the as-received basis. Basis: 100 kg of coal as received The water formed on combustion is 5.6 kg Ha 1 kg mol H; | 1 kg mol H2O 2.02 kg Hz 18 kg H,O 1 kg mol H2 | 1 kg mol H,O 49.9 kg H20 The energy required to evaporate the water is 49.9 kg H,O | 2370 kJ _ 1183 kJ 100 kg coal | kg H20 kg coal The net heating value is 29,770 – 1183 = 28,587 kJ/kg The valuc 2370 kJ/kg is not the latent heat of vaporization of water at 25°C (2440 kJ/kg) but includes the effect of a change from a heating value at constant volume to one at constant pressure (-70 kJ/kg) as described in a later section of this chapter. Use the Dulong formulate to calculate the HHV of this coal. Do you get 30,000 kJ/kg?

Introduction to Chemical Engineering Thermodynamics
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
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1. The corrected ultimate analysis shows 5.6% hydrogen on the as-received basis. Basis: 100 kg of coal as received The water formed on combustion is 5.6 kg Ha 1 kg mol H3 | 1 kg mol H20|18 kg H20 1 kg mol H. | 1 kg mol H¿O 49.9 kg H20 2.02 kg H2 The energy required to evaporate the water is 49.9 kg H,O | 2370 kJ 100 kg coal | kg H20 kg coal 1183 kJ The net heating value is 29,770 – 1183 = 28,587 kJ/kg The value 2370 kJ/kg is not the latent heat of vaporization of water at 25°C (2440 kJ/kg) but includes the effect of a change from a heating value at constant volume to one at constant pressure (-70 kJ/kg) as described in a later section of this chapter. Use the Dulong formulate to calculate the HHV of this coal. Do you get 30,000 kJ/kg?
Transcribed Image Text:1. The corrected ultimate analysis shows 5.6% hydrogen on the as-received basis. Basis: 100 kg of coal as received The water formed on combustion is 5.6 kg Ha 1 kg mol H3 | 1 kg mol H20|18 kg H20 1 kg mol H. | 1 kg mol H¿O 49.9 kg H20 2.02 kg H2 The energy required to evaporate the water is 49.9 kg H,O | 2370 kJ 100 kg coal | kg H20 kg coal 1183 kJ The net heating value is 29,770 – 1183 = 28,587 kJ/kg The value 2370 kJ/kg is not the latent heat of vaporization of water at 25°C (2440 kJ/kg) but includes the effect of a change from a heating value at constant volume to one at constant pressure (-70 kJ/kg) as described in a later section of this chapter. Use the Dulong formulate to calculate the HHV of this coal. Do you get 30,000 kJ/kg?
1. Coal gasification consists of the chemical transformation of solid coal into gas. The heating values of coal differ, but the higher the heating value, the higher the value of the gas produced (which is essentially methane, carbon monoxide, hydrogen, etc.). The following coal has a reported heating value of 29,770 KJ/Kg as received. Assuming that this is the gross heating value, calculate the net heating value. Component Percent C 71.0 H2 N2 Net S 5.6 1.6 2.7 Ash 6.1 O2 13.0 Total 100.0
Transcribed Image Text:1. Coal gasification consists of the chemical transformation of solid coal into gas. The heating values of coal differ, but the higher the heating value, the higher the value of the gas produced (which is essentially methane, carbon monoxide, hydrogen, etc.). The following coal has a reported heating value of 29,770 KJ/Kg as received. Assuming that this is the gross heating value, calculate the net heating value. Component Percent C 71.0 H2 N2 Net S 5.6 1.6 2.7 Ash 6.1 O2 13.0 Total 100.0
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