Vertical Water-Tube Boilers - Milne Water Tubes Vertical Steam and Water Drum Horizontal Curved-Tube Single-Tube Non-Sectional

VERTICAL WATER-TUBE BOILERS - MILNE: WATER TUBES VERTICAL, STEAM AND WATER DRUM HORIZONTAL, CURVED-TUBE, SINGLE-TUBE, NON-SECTIONAL This boiler (Fig. 65) is in many respects similar to the Stirling (Fig. 64), but an inspection of the two illustrations will show several differences. In the Milne boiler there is but one steam and water drum and the tubes are vertical with a slight curve at the ends. The hot gases are guided by division plates or tile so that they traverse (5 feet of tube-heating surface before they enter the flue. The tubes, being vertical, do not become covered with fine ash, nor do they become clogged with sediment and scale.

Circulation.

The feed water enters the row of tubes at the extreme left and flows downward to the mud drum. It then rises as it becomes heated in the hotest generating tubes and enters the steam drum as steam and water. This method of feeding keeps the cold feed water out of the steam drum, and as the cold tubes containing the feed are placed in the path of the escaping gases, but little heat escapes to the chimney.