# Análisis 67: Gas natural alimenta un motor de encendido por chispa, con presencia de disociación

{% hint style="info" %}
Un gas natural alimenta un motor de encendido por chispa. La cámara de combustión se encuentra a 20 bar, siendo la temperatura de los gases de combustión de 1900 ºC. El dosado relativo es 1.0526. El aire está compuesto de N<sub>2</sub>, O<sub>2</sub>, CO<sub>2</sub>, Ar y trazas de otros gases. La composición volumétrica del gas natural es mostrada a continuación:

* Metano --> 81.41 %
* Etano    --> 9.87 %
* Propano --> 0.59 %
* Nitrógeno --> 0.18 %
* Isobutano --> 0.06 %
* n-butano --> 0.09 %
* Isopentano --> 0.03 %
* n-pentano --> 0.03 %

Reacciones de equilibrio químico a considerar:

* ½ H<sub>2</sub> <--> H
* ½ O<sub>2</sub> <-->O
* ½ N<sub>2</sub> <-->N
* H<sub>2</sub>O <--> OH + ½ O<sub>2</sub>
* CO<sub>2</sub> <--> CO + ½ O<sub>2</sub>
* ½ O<sub>2</sub> + ½ N<sub>2</sub> <--> NO
* H<sub>2</sub>O <--> H<sub>2</sub> + ½ O<sub>2</sub>

Coeficiente de exceso de aire = 1/Fr = 0.95
{% endhint %}

![](https://thermosuite.com/manual/67/media/image2.png) ![](https://thermosuite.com/manual/67/media/image3.png) ![](https://thermosuite.com/manual/67/media/image4.png)

![](https://thermosuite.com/manual/67/media/image5.png) ![](https://thermosuite.com/manual/67/media/image6.png)

<figure><img src="/files/zZjfuGO5yZnbhTYgxLoM" alt=""><figcaption></figcaption></figure>

![](https://thermosuite.com/manual/67/media/image7.png)

![](https://thermosuite.com/manual/67/media/image8.png) ![](https://thermosuite.com/manual/67/media/image9.png)

Sin disociación química:

![](https://thermosuite.com/manual/67/media/image10.png)

![](https://thermosuite.com/manual/67/media/image11.png) ![](https://thermosuite.com/manual/67/media/image12.png)

![](https://thermosuite.com/manual/67/media/image13.png) ![](https://thermosuite.com/manual/67/media/image14.png)

![](https://thermosuite.com/manual/67/media/image15.png)

![](https://thermosuite.com/manual/67/media/image16.png)

![](https://thermosuite.com/manual/67/media/image17.png)

![](https://thermosuite.com/manual/67/media/image18.png)

![](https://thermosuite.com/manual/67/media/image19.png)

Con disociación química a 1900 ºC:

![](https://thermosuite.com/manual/67/media/image20.png)

![](https://thermosuite.com/manual/67/media/image21.png)

![](https://thermosuite.com/manual/67/media/image22.png)

![](https://thermosuite.com/manual/67/media/image23.png)

![](https://thermosuite.com/manual/67/media/image24.png)

![](https://thermosuite.com/manual/67/media/image25.png)

![](https://thermosuite.com/manual/67/media/image26.png)

![](https://thermosuite.com/manual/67/media/image27.png)

![](https://thermosuite.com/manual/67/media/image28.png)

![](https://thermosuite.com/manual/67/media/image29.png)

![](https://thermosuite.com/manual/67/media/image30.png)

![](https://thermosuite.com/manual/67/media/image31.png)

![](https://thermosuite.com/manual/67/media/image32.png)

![](https://thermosuite.com/manual/67/media/image33.png)

El balance de materia a temperatura adiabática (obtenida con el software):

![](https://thermosuite.com/manual/67/media/image34.png)

![](https://thermosuite.com/manual/67/media/image35.png)


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