Water tube boiler is name from boiler structures such kind of boiler where the water is heated inside tubes and the hot gasses surround them. This is the basic definition of water tube boiler. Actually this boiler is just opposite of fire tube boiler where hot gasses are passed through tubes which are surrounded by water. View more about water tube boiler and fire tube boiler difference.
The heated water then rises into the steam drum. Here, saturated steam is drawn off the top of the drum. In some services, the steam will reenter the furnace through a super heater to become super heated. Super heated steam is defined as steam that is heated above the boiling point at a given pressure. Super heated steam is a dry gas and therefore used to drive turbines, since water droplets can severely damage turbine blades.
Cool water at the bottom of the steam drum returns to the feed water drum via large-bore 'down comer tubes', where it pre-heats the feed water supply. (In large utility boilers, the feed water is supplied to the steam drum and the down comers supply water to the bottom of the water walls). To increase economy of the boiler, exhaust gases are also used to pre-heat the air blown into the furnace and warm the feed water supply. Such water tube boilers in thermal power stations are also called steam generating unit.
a.Available in sizes that are far greater than the fire tube design. Up to several million pounds per b.hour of steam.
Able to handle higher pressures up to 5,000 psig
c.Recover faster than their fire tube cousin
d.Have the ability to reach very high temperatures
The ability of water tube boilers to generate super heated steam makes these boilers particularly attractive in applications that require dry, high-pressure, high-energy steam, including steam turbine power generation. Owing to their superb working properties, the use of water tube boilers is highly preferred in the following major areas:
a.Variety of process applications in industries: textile...
b.Chemical processing divisions, fertilizer factory
c.Pulp and Paper manufacturing plants: paper mill
d.Central heating: school, hotel, restaurant, hospital etc.
Now, I think everyone will have a well understan on what is water tube boilers. So,ask ZG Boiler professionals what they would recommend and have them explain why, if you have demand on water tube boiler.
Keyword: Industry steam boiler,What is water tube boilers,water tube boiler working principleSource: http://www.zgsteamboiler.com/faq/what-is-water-tube-boiler.html
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Source: http://www.zgsteamboiler.com/faq/what-is-water-tube-boiler.html
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