Reconsider Prob. 16-88 . Using EES (or other) software, study the effect of excess air on the eq

Reconsider Prob. 16-88 . Using EES (or other) software,...

Key Concepts

Data Visualization

Data visualization involves graphically representing data to reveal trends, correlations, and patterns. In the context of combustion studies, plotting variables such as exit temperature against percent excess air helps in understanding how operational changes influence performance and thermal characteristics, aiding both analysis and design decisions.

Numerical Simulation

Numerical simulation is the use of computer-based methods to solve complex systems of equations that describe the behavior of physical systems, such as combustion. Tools like EES facilitate systematic parametric studies of how variables like excess air affect equilibrium composition and the exit temperature, providing insights that are difficult to obtain analytically.

Chemical Equilibrium

Chemical equilibrium is the state in which the rate of the forward chemical reactions equals the rate of the reverse reactions, resulting in constant concentrations of all reacting species. In combustion, reaching equilibrium allows for the prediction of final species concentrations and energy release under various conditions.

Excess Air

Excess air refers to the additional air supplied beyond what is theoretically needed for complete combustion of a fuel. Its presence dilutes the combustion mixture, affects flame temperatures, and alters the equilibrium composition of the combustion products by increasing the amount of inert gases.

Combustion Analysis

Combustion analysis involves understanding the chemical reactions between a fuel and an oxidizer, focusing on energy release, reaction kinetics, and the resultant mixture of products. This analysis is crucial for determining how changes in fuel-air ratios, particularly with varying levels of excess air, impact both the efficiency and environmental emissions of combustion processes.

Transcript

00:01 So here, the effect of varying the percent excess air during the steady flow process from 0 to 200 percent on the temperature at which 97 percent of carbon monoxide is burned.

00:20 So co2 is to be studied.

00:23 Now, to solve this problem, we need to give ees a guest value for t prop, a guest value for t prop.

00:33 Other than the default value of one.

00:36 So it should have a guess value other than one.

00:46 Now set the guess value of t -prod to 1 ,000 kelvin by selecting variable information in the options menu.

00:54 So first thing that you have to give is let's give t -prod.

01:00 If we're not proper product temperature to be 1 ,000 kelvin, using the variable info in options menu.

01:17 Now the input, you know, and then press f2 or click the calculator icon.

01:30 This is the first thing that we have to do.

01:33 Now after that, the input data from the diagram window gives you know percent excess is equals to 100.

01:47 So x is equal to 100.

01:48 Equals to percent excess divided by 100.

01:56 X equals to percent excess air divided by 100.

02:06 Then we get, sorry for the inconvenience course here.

02:24 So here we get free fraud, this pressure is equals to 101 .3 kilofascal ru equal to 8 .314 kilojou per kilo mole kelvin f equals to 0 .97.

02:50 So the combustion equation for stoichiometric amount of air, that is co plus 0 .502 plus 3 .76 and 2 equals to co2 plus co2 plus 0 .0 plus 0 .0 plus 0 .0 plus 0 .2 plus 0 .5 into 3 .76 nt.

03:15 Now considering this equation, for incomplete, it would be, the incomplete one, complete combustion, it would be co plus 1 plus ex into 0 .5 into 002 plus 3 .76 and 2...

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