Construction and Working Principle of Babcock and Wilcox Boiler

We already know that Boiler is an essential part for a thermal power plant. Boiler also use in several industries like Dyeing Industry, Poultry Farm and others. This type of boiler called Industrial Boiler.

What is Water Tube Boiler?

If a boiler having the system of water flow inside of its tube and heat flow system present in outside then it will called a Water Tube Boiler. Water Tube Boiler can have Straight and Bent Tube, Cross and Vertical Drum, Horizontal, Vertical and Inclined Tubes, Single or Multi Drum, Sectional and Box type Header. By the manufacturing name this type of boiler can be divided by five types and those are,

  1. Babcock or Wilcox Boiler
  2. La-mont Boiler
  3. Benson Boiler
  4. Loeffler Boiler
  5. Velox Boiler

Related: Definition of Boiler and Various Types of Steam Boiler or Steam Generator

In this post we will know about the Construction and Working Principle of Babcock and Wilcox Boiler. Don’t worry; I will discuss another four type of boiler Construction and Working Principle in different article.

What are Babcock and Wilcox Boiler?

Babcock and Wilcox Boiler is a horizontal type drum axis, natural circulation, stationary, high pressure, solid fuel fired water tube boiler. In the year of 1967, it was introduced by George Herman Babcock and Stephen Wilcox. After that Babcock and Wilcox Boiler was named by its inventor as Babcock and Wilcox and till now we are using this name.

Babcock and Wilcox Boiler
Babcock and Wilcox Boiler. Source- SlideShare

Construction and Working Principle of Babcock and Wilcox Boiler:

Generally a Babcock or Wilcox Boiler means it is inclined water tube boiler. In this type of boiler all tubes usually stay straight and attached with header. All tubes tilted with a concrete wall which usually presents upper side of furnaces and it also attached with steam drum. On the steam drum Safety Valve, Manhole and Super Heater system present. Steam Flow Pipe stay attached with the Super Heater.

When boiler is operational that time water from inside the tube turns to steam by the heat from the furnaces and generated steam stored into a steam drum. Pressure inside the Steam Drum will increase when it’s having large amount of generated primary steam. Then for protecting the entire boiler from damaging, safety valve release some steam and remain constant steam pressure inside the steam drum.

Due to water and steam flow, a spot overlie inside the water tubes and steam drum and it’s called “Scale” and the processes called “Scaling”. For this reason this Scale need to clean from inside and outside of the water tube randomly by routine inspection. Because it’s very dangerous for the boiler operation. Heat circulation system always restore completely by cleaning the “Scale” in time.

Related: Why Boiler Explode and How to Prevent Explosion

Boiler Tube maintain 15 degree angle with the header from its center point and it remain attached with header. For this reason it has a Drainout system for cleaning the liquid dust particle form boiler water tube.

This type of boiler can generate 3725000 lbs (1693181.9 kg) steam in one hour. But the total amount of steam generation will always depends on boiler size and its types.

When steam come out from the water tube and store into the steam drum then this primary steam sent to Super Heater for removing all remaining water particle from steam that can be use in next process.  This super heated steam contains more energy than primary generated steam. For this reason this super heated steam always use for rotating steam engine or turbine.

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