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Calculo de flujo de purga de caldera

October 02, 2017 0 Comments

Calculo de flujo de purga de caldera

Para controlar el nivel de sólidos disueltos totales (TDS) dentro de la caldera

Como el agua se hierve dentro de la caldera y se produce vapor de agua, a continuación, se mantienen los sólidos en el agua y concentrado. Por lo tanto, con el tiempo el nivel de sólidos disueltos totales (TDS) aumenta. Además evaporación causa estos sólidos disueltos a salir de la solución, y para producir sólidos en suspensión (fangos). A medida que los sólidos disueltos aumentan existe el riesgo de continuar over 'de agua de la caldera en el vapor. Por tanto, es muy importante controlar el nivel de sólidos disueltos totales. Esto se consigue ya sea por soplado continuo o intermitente. inferior manual de golpe hacia abajo a través del fondo principal válvula de purga aún debe llevarse a cabo a intervalos regulares para eliminar el lodo.

Control manual de TDS y purga

Tiempo Caldera TDS máximo admisible Promedio

Control automático de TDS y purga

Tiempo Caldera TDS máximo admisible Promedio

El hervidor de agua TDS TDS del agua de la caldera

Cómo calcular el caudal de purga requerido de una caldera

velocidad de purga =

𝐹𝐹 × 𝑆𝑆 Dónde: 𝐵𝐵-𝐹𝐹F

 

Por ejemplo:

Para mantener una caldera de vapor produciendo 4.000 kg / h de vapor de agua por debajo de 3.500 ppm TDS cuando se alimenta desde un tanque de alimentación que tiene un TDS de 80 ppm, que tendrá que purga al menos;

F 80 ppm 80 × 4,000 S 4,000 kg / hr 3500 - 80 B 3.500 ppm

niveles permisibles típicos de TDS agua de la caldera

= 93,6 kg / hr

TDS tanque de alimentación en ppm

producción de vapor real de la caldera en kg / hr

TDS máximo permitido en la caldera en ppm

Tipo de caldera

nivel de TDS en partes por millón (ppm)

tubo de agua - Alta Presión

1000

shell Vertical

2500

Modern empaquetado 3 pase

3000

Más viejo 2 pase económica

4500

tubo de agua - Baja Presión

5000

Lancashire

10000

 

Lea más en http://byworth.co.uk/wp-content/uploads/2015/06/Best-Practice-in-Boiler-Water-Treatment-Part-21.pdf


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