# Análisis 81: Motor de combustión interna con hidrocarburos sin quemar

{% hint style="info" %}
Un motor de combustión interna genera la siguiente composición de productos de combustión volumétrica en base seca:

* CO<sub>2</sub> --> 12.29 %
* CO   --> 6.20 %
* H<sub>2</sub>    --> 3.23 %
* CH<sub>4</sub> (inquemados) --> 550 ppm
* N<sub>2</sub> el resto

Obtener:

1. Fórmula molecular del combustible
2. La relación molar H/C del combustible
3. La relación gravimétrica aire/combustible
4. La relación gravimétrica estequiométrica aire/combustible
5. La constante de equilibrio

*(Introduction to Internal Combustion Engines de Richard Stone)*
{% endhint %}

![](https://thermosuite.com/manual/81/media/image2.png) ![](https://thermosuite.com/manual/81/media/image3.png)

![](https://thermosuite.com/manual/81/media/image4.png)

En este problema no son conocidos, ni el coeficiente de exceso de aire, ni la temperatura de los productos de combustión.

![](https://thermosuite.com/manual/81/media/image5.png) ![](https://thermosuite.com/manual/81/media/image6.png) ![](https://thermosuite.com/manual/81/media/image7.png)

![](https://thermosuite.com/manual/81/media/image8.png)

![](https://thermosuite.com/manual/81/media/image9.png)

![](https://thermosuite.com/manual/81/media/image10.png)

La constante de equilibrio es obtenida por el programa, K<sub>p</sub>=0.592402 así como su temperatura correspondiente de equilibrio, T<sub>p</sub> = 1020.6 ºC.

![](https://thermosuite.com/manual/81/media/image11.png)

![](https://thermosuite.com/manual/81/media/image12.png)

El bajo valor de la relación H/C molar es típico de un combustible con mezcla de compuestos con alto contenido de aromáticos (benceno, tolueno y/o m-xylene).

![](https://thermosuite.com/manual/81/media/image13.png)

![](https://thermosuite.com/manual/81/media/image14.png)

![](https://thermosuite.com/manual/81/media/image15.png) ![](https://thermosuite.com/manual/81/media/image16.png) ![](https://thermosuite.com/manual/81/media/image17.png)

![](https://thermosuite.com/manual/81/media/image18.png)

![](https://thermosuite.com/manual/81/media/image19.png)

![](https://thermosuite.com/manual/81/media/image20.png)

Empleando la formula química normalizada:

![](https://thermosuite.com/manual/81/media/image21.png)

![](https://thermosuite.com/manual/81/media/image22.png)

![](https://thermosuite.com/manual/81/media/image23.png)

![](https://thermosuite.com/manual/81/media/image24.png) ![](https://thermosuite.com/manual/81/media/image25.png) ![](https://thermosuite.com/manual/81/media/image26.png)

![](https://thermosuite.com/manual/81/media/image27.png)

![](https://thermosuite.com/manual/81/media/image28.png)


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