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 chamberand entering the reaction chamber of a thermal incinerator is750 *C. The polluted airflow rate is 500 m /min at 77 *C, Thefuel gas (methane) is available at 20 C and the burner draws iasupplemental air (at 25 °C) at the rate of 14 kg air/kg fuel gas.Calculate the required flow rate of methane. Ignore heat lossesand heat generation from pollutant combustion. Give youranswer in kg/min and in m/min.

We know that: The density of air at 59° F=0.0765 lb/ft3 The density of air at 1160° F:

Answered: 11.2 The desired gas temperature…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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.

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