Simple vertical boiler is a boiler which is constructed vertically and produces steam at low pressure and in small quantities. Therefore simple vertical boiler is used in low power generation or in places where space is limited. Construction of this boiler type is shown in Figure 1.
Figure 1: Simple Vertical Boiler
Simple vertical boiler consists of wall cylinder which surrounding the cylindrical fire box. Cylindrical fire box is tapped on it where steam flow to the surface. At the bottom of fire box there is grate. The fire box is equipped with two or more slope transverse pipe F, F. The slope aims to raise heating surface in addition also to improve water circulation.
Hand hole is made cleaning deposit purpose. A man hole is created above to so people can enter the boiler for cleaning. A ash hole is made on the bottom of boiler for disposal of ash buildup. The space between boiler wall and fire box is filled with water to be heated.
The LaMont boiler is a semi-flash boiler in which the feedwater is supplied by means of a pump to the ends of long closely spaced tubes of small diameter. The tubes end in a separating drum where the emulsion of steam and water separates. The boiler requires a powerful pump for the forced circulation of the boiler water. The LaMont boilers forced water circulation and the tubes of small diameter gives enormous freedom as far as the design of the heating surfaces concern. Operating priciples:
The Lamont boiler is like a big Doble F boiler in that it has a large helical furnace wall and helical coils top and bottom. The furnace is large and the water in the coils is force circulated at more than 5 times full boiler output. Thus very high heat transfer and radiation rates can be designed for with complete safety as the tube walls are nailed to a temperature a few degrees higher than the steam-water saturation temperature. Heat absorption rates as high as 60,000BTU/ft.sq. for the...