Final Boiler - Free download as Powerpoint Presentation (.ppt /.pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. This ppt contains details of boilers i.e. Cochran, babcock wilcox and lancashire etc.

Babcock & wilcox boiler harshil. 1.

Present by: Mehta Harshil Enrollment no: 07 Electrical department GEC MODASA. General: This boiler is used when pressure is above 10 bar Capacity: 7000 kg of steam/hr It is used to operate high pressure. Characteristics of Boiler Horizontal boiler Water – tube boiler Stationary boiler Externally boiler Multiple tube boiler Natural circulation boiler High pressure boiler.

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Specification of boiler  Diameter of drum: 1.22 to 1.83 m  Length: 6.096 to 9.144 m  Size of water tube: 7.62 to 10.16 cm  Size of superheated tube: 3.84 to 5.71 cm  Maximum working pressure: 41 bar  Maximum steaming capacity: 40,000 kg/hr  Efficiency: 60 to 80%.  This headers are connected to a inclined water tubes. The water tube inclined to the horizontal about 15ansh. The baffles plate are provided in order to make circulation of hot gases in sine waves form. A damper is fitted at back of the boiler to regulate draught.

The damper control the flow of air into the furnace. Water is heated by hot gases coming from furnace.

Babcock And Wilcox

By four B&W boilers. Awarded contracts to design and build boilers for the S.S. States, the first American superliner. June 23, 2014: Acquires industrial products and services firm MEGTEC​. July 5, 2016: Acquires cooling systems and services firm SPIG. George Babcock, Stephen Wilcox.

Due to heating of water density of water decreases. Low density water move upwards in water tube and finally water converted into the steam. This cycle repeat continuously. The steam flows in super heater tubes and is finally taken out through the main steam stop valve and supplied to the engine when needed in the end of the process mud collector is provided to remove the mud particles through a blow down cock. It uses both solid as well as liquid fuel for burning.

The draught losses as compared to other boilers is minimum. As compared to other boilers the evaporative capacity is high. The circulation of water is natural.

The defective tubes can be replaced easily. It is used in power stations for generating large quantity of steam.

PowerPoint Presentation: The damper control the flow of air into the furnace. Water is heated by hot gases coming from furnace. Due to heating of water density of water decreases. Low density water move upwards in water tube and finally water converted into the steam. This cycle repeat continuously.

The steam flows in superheater tubes and is finally taken out through the main steam stop valve and supplied to the engine when needed In the end of the process mud collector is provided to remove the mud particles through a blow down cock.

Construction of babcock and wilcox boiler • 1. Construction of Babcock and Wilcox BoilerThe Babcock and Wilcox Boiler consists of 1. Steam and water drum (boiler shell) 2.

Water tubes 3. Uptake-header and down corner 4. Super heater 8. Inspection door 10. DamperSteam and water drum (boiler shell):One half of the drum which is horizontal is filled up with water and steam remains on theother half.

It is about 8 meters in length and 2 meter in diameter.Water tubes:Water tubes are placed between the drum and furnace in an inclined position (at an angle of10 to 15 degree) to promote water circulation. These tubes are connected to the uptake-headerand the down-comer as shown.Uptake-header and down-corner (or downtake-header)The drum is connected at one end to the uptake-header by short tubes and at the other end tothe down-corner by long tubes. • Grate: Coal is fed to the grate through the fire door.Furnace: Furnace is kept below the uptake-header.Baffles: The fire-brick baffles, two in number, are provided to deflect the hot flue gases.Superheater: The boiler is fitted with a superheater tube which is placed just under the drumand above the water tubesMud box: Mud box is provided at the bottom end of the down comer. The mud or sedimentsin the water are collected in the mud box and it is blown-off time to time by means of a blow–off cock.Inspection doors: Inspection doors are provided for cleaning and inspection of the boiler.Working Babcock and Wilcox Boiler:Coal is fed to the grate through the fire door and is burnt.Flow of flue gases:The hot flue gases rise upward and pass across the left-side portion of the water tubes. Thebaffles deflect the flue gases and hence the flue gases travel in the zig-zag manner (i.e., thehot gases are deflected by the baffles to move in the upward direction, then downward andagain in the upward direction) over the water tubes and along the superheater. The flue gasesfinally escape to atmosphere through chimney.Water circulation:That portion of water tubes which is just above the furnace is heated comparatively at ahigher temperature than the rest of it.

Boilers.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf). Firing is used in Babcock and Wilcox Boiler. 3) Pressure of Steam: i).

Water, its density being decreased, rises into the drumthrough the uptake-header. Here the steam and water are separated in the drum. Steam beinglighter is collected in the upper part of the drum. The water from the drum comes downthrough the down –comer into the water tubes.A continuous circulation of water from the drum to the water tubes and water tubes to thedrum is thus maintained.

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The circulation of water is maintained by convective currents and isknown as “natural circulation”.A damper is fitted as shown to regulate the flue gas outlet and hence the draught.The boiler is fitted with necessary mountings. Pressure gauge and water level indicator aremounted on the boiler at its left end. Steam safety valve and stop valve are mounted on thetop of the drum. Blow-off cock is provided for the periodical removed of mud and sedimentscollected in the mud box.Salient features of Babcock and Wilcox Boiler: • 1. Its overall efficiency is higher than a fire tube boiler.

The defective tubes can be replaced easily. All the components are accessible for inspection even during the operation. The draught loss is minimum compared with other boiler. Steam generation capacity and operating pressure are high compared with other boilers.

The boiler rests over a steel structure independent of brick work so that the boiler may expand or contract freely. The water tubes are kept inclined at an angle of 10 to 15 degree to promote water circulation.Advantages and disadvantages of water tube boilers overfire tube boilers:Advantages water tube boilers 1. Steam can be generated at very high pressures.

Heating surface is more in comparison with the space occupied, in the case of water tube boilers. Steam can be raised more quickly than is possible with a fire tube boiler of large water capacity. Hence, it can be more easily used for variation of load. The hot gases flow almost at right angles to the direction of water flow. Hence maximum amount of heat is transferred to water.

A good and rapid circulation of water can be made. Bursting of one or two tubes does not affect the boiler very much with regard to its working. Hence water tube boilers are sometimes called as safety boilers.

The different parts of a water tube boiler can be separated. Hence it is easier to transport. It is suitable for use in steam power plants (because of the various advantages listed above).Disadvantages of water tube boilers 1. It is less suitable for impure and sedimentary water, as a small deposit of scale may cause the overheating and bursting of tubes. Hence, water treatment is very essential for water tube boilers. Maintenance cost is high.