Steam Boiler | Working principle and Types of Boiler ...
Aug 22, 2018· Steam Boiler | Working principle and Types of Boiler. August 22, 2018 February 24, 2012 by Electrical4U. ... Normally horizontal return fire tube boiler is used in thermal power plant of low capacity. It consists of a horizontal drum into which there are numbers of horizontal tubes. These tubes are submerged in water.