(Superheated steam)
A water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. Water tube boilers are used for high-pressure boilers. Fuel is burned inside the furnace, creating hot gas which heats water in the steam-generating tubes. ...
The water-tube boiler was patented in 1867 by American inventors George Herman Babcock and Stephen Wilcox. In the water-tube boiler, water flowed through tubes heated externally by combustion gases, and steam was collected above in a drum. Water tube boilers are very huge and their water holding capacity is enormous. The water-tube boiler became the standard for all large boilers as they allowed for higher pressures than earlier boilers, higher than 30 bar. Example, Babcock & Wilcox boiler manufactured at Thermax Boilers Ltd., Pune.
It is a horizontal, externally fired, stationary, high pressure, water tube boiler with a super heater as shown below.
The position of water tubes near the furnace is heated to a higher temper than the rest. Owing to higher temperature, the density of water decreases and hence the water rises through the uptake header and short tube to the drum. The water at the back end, which is at a lesser temperature now travels down through the long tube and the downtake header. Thus, a continuous circulation of water called as natural circulation is established between the water tubes and the drum. The steam produced gets collected above the water in the drum.Here, saturated steam is drawn off the top of the drum.
Since water droplets can severely damage turbine blades, dry steam from the steamdrum is again heated to generate superheated steam at 730°F (390°C) or higher in order to ensure that there is no water entrained in the steam. Cool water at the bottom of the steam drum returns to the feedwater drum via large-bore 'downcomer tubes', where it helps pre-heat the feedwater supply. To increase the economy of the boiler, the exhaust gasses are also used to pre-heat the air blown into the furnace and warm the feedwater supply. Such water-tube boilers in thermal power station are also called steam generating units.
A water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. Water tube boilers are used for high-pressure boilers. Fuel is burned inside the furnace, creating hot gas which heats water in the steam-generating tubes. ...
The water-tube boiler was patented in 1867 by American inventors George Herman Babcock and Stephen Wilcox. In the water-tube boiler, water flowed through tubes heated externally by combustion gases, and steam was collected above in a drum. Water tube boilers are very huge and their water holding capacity is enormous. The water-tube boiler became the standard for all large boilers as they allowed for higher pressures than earlier boilers, higher than 30 bar. Example, Babcock & Wilcox boiler manufactured at Thermax Boilers Ltd., Pune.
It is a horizontal, externally fired, stationary, high pressure, water tube boiler with a super heater as shown below.
The coal is fed from hopper on to the grate where it is burnt. The flue gases are deflected by the fire brick baffles so that they pass across the left side of the tubes in a beneficial path transferring heat to water in the tubes and to the steam in the super heater and finally they escape into the atmosphere through the chimney. The drought is regulated by a damper placed at the back chamber.
The position of water tubes near the furnace is heated to a higher temper than the rest. Owing to higher temperature, the density of water decreases and hence the water rises through the uptake header and short tube to the drum. The water at the back end, which is at a lesser temperature now travels down through the long tube and the downtake header. Thus, a continuous circulation of water called as natural circulation is established between the water tubes and the drum. The steam produced gets collected above the water in the drum.Here, saturated steam is drawn off the top of the drum.
Since water droplets can severely damage turbine blades, dry steam from the steamdrum is again heated to generate superheated steam at 730°F (390°C) or higher in order to ensure that there is no water entrained in the steam. Cool water at the bottom of the steam drum returns to the feedwater drum via large-bore 'downcomer tubes', where it helps pre-heat the feedwater supply. To increase the economy of the boiler, the exhaust gasses are also used to pre-heat the air blown into the furnace and warm the feedwater supply. Such water-tube boilers in thermal power station are also called steam generating units.
1 comments:
For proper combustion of fuel inside the boiler, a certain amount of oxygen is required.
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