STEAM BOILERS SUBMITTED TO: Mr. Ankit Soni Assistant Prof. Mechanical Dept. SUBMITTED BY: Mukul Dev Kushwah 0903ME Dec

Contents General Introduction of Steam Boilers. Steam & Its Uses. Boilers Classification with Example. Mountings & Accessories in Steam Boilers. Draughts with its Uses. Capacity & Efficiency of Steam Boilers. Needs Required for a Good Boiler. Reference Dec 2011

General Introduction It is a closed vessel in which water is firstly heated, then vaporized & finally converted into steam. The pressure at which steam generated is always higher than the atmospheric pressure. The energy which is used to produced steam is “Heat Energy” & it is measured in calorie Dec 2011

Simple Figure of Steam Boiler 4 20 Dec 2011

Steam & Its Uses Steam: It is simply the water vapor, which is formed when water boils. Basically, steam is the gaseous phase of water. Steam is used for various purposes:  In Power Generation.  In Industrial Process.  Heating Dec 2011

Boilers Classification According to their relative position. According to water circulation. According to its position. According to the steam pressure. According to its use Dec 2011

Fire tube and Water tube Boiler 7 20 Dec 2011

Mountings in Boiler Safety Valves. Pressure gauge. Feed Check Valve. Fusible Plug Feed Pipe. Steam Stop Valve. Water Level Indicator. 20 Dec

Simple Figure of Steam Boilers Mounting 9 20 Dec 2011

Boilers Accessory Economizer. Super-heater. Air –pre heater. Steam Injector. Feed-pump. 20 Dec

Simple Figure of Steam Boilers Accessories Dec 2011

Draught in Boilers It is defined as the pressure difference due to which the flow of gases inside in a boiler takes place. The pressure difference is very small. It works in such a way that it sucks the air from furnace and discharged the hot flue gases in atmosphere. It is of two types: i. Natural Draught. ii. Artificial Draught. 20 Dec

Working of Draught Dec 2011

Boilers Evaporation Capacity & Efficiency The quantity of steam which is generated by boiler at full load is called ‘evaporation capacity of boiler”. It is basically the ratio of mass of steam generated to time or heating area or mass of fuel burned per hours. It is defined as the ratio of actual heat utilized in steam production to the amount of heat liberated by burning of fuel. The first quantity is measured in kg/hour or kg/hour/m*m or kg/kg while the second one is measured in % Dec 2011

Needs Required for a Good Boiler The boiler should have maximum steam generation with minimum using of fuel consumption. It should be very economical and also have a low maintenance cost. It should be started and stopped quickly. It should posses better combustion and overall efficiency as well Dec 2011

Reference s Basic Mechanical Engineering by V.D.Shrivastava, S.K.Somani and M.M.Rathore. Basic Mechanical Engineering by D.K.Gupta Dec 2011