11.2 The desired gas temperature exiting the flame mixing chamber and entering the reaction chamber of a thermal incinerator is 750 *C. The polluted airflow rate is 500 m /min at 77 *C, The fuel gas (methane) is available at 20 C and the burner draws ia supplemental air (at 25 °C) at the rate of 14 kg air/kg fuel gas. Calculate the required flow rate of methane. Ignore heat losses and heat generation from pollutant combustion. Give your answer in kg/min and in m/min.

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
5th Edition
ISBN:9781305084766
Author:Saeed Moaveni
Publisher:Saeed Moaveni
Chapter11: Temperature And Temperature- Related Variables In Engineering
Section: Chapter Questions
Problem 24P
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By how much could the flow rate of fuel gas of Example 11.2 be reduced if a recuperator were used to preheat the waste gas by recovering the enthalpy released when reducing the exhaust gas temperature from 1350 oF to 650 oF? Determine the preheated waste gas temperature as it enters the afterburner.

11.2 The desired gas temperature exiting the flame mixing chamber
and entering the reaction chamber of a thermal incinerator is
750 *C. The polluted airflow rate is 500 m /min at 77 *C, The
fuel gas (methane) is available at 20 C and the burner draws ia
supplemental air (at 25 °C) at the rate of 14 kg air/kg fuel gas.
Calculate the required flow rate of methane. Ignore heat losses
and heat generation from pollutant combustion. Give your
answer in kg/min and in m/min.
Transcribed Image Text:11.2 The desired gas temperature exiting the flame mixing chamber and entering the reaction chamber of a thermal incinerator is 750 *C. The polluted airflow rate is 500 m /min at 77 *C, The fuel gas (methane) is available at 20 C and the burner draws ia supplemental air (at 25 °C) at the rate of 14 kg air/kg fuel gas. Calculate the required flow rate of methane. Ignore heat losses and heat generation from pollutant combustion. Give your answer in kg/min and in m/min.
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