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Water Tube Boilers
Suitable for high steam pressure (above 500 psig) and temperature(to 1000 F) and large capacities exceeding millions of lb/h of steam.
Extended surfaces can be used in waste heat applications to make the boilers compact if the gas stream is clean.
Various types of fuels can be fired with ease including solid,liquid and gaseous. The water cooled membrane wall construction makes an excellent furnace.
If the gas stream is dirty(as in MSW applications)provision can be made for cleaning using soot blowers or rapping mechanisms.Wide spaced tubes can be used at the gas inlet to minimize bridging of slag deposits and tube spacing can be decreased as the gas is cooled.This flexibility does not exist in fire tube designs.
Superheaters if used can be located at the optimum gas temperature region shielded by any number of screen tubes.In fire tube boiler the choice is at the gas inlet or exit.
Due to low water volume,the startup time is lesser and response to load changes is faster compared to fire tube boilers.
If the gas pressure is high,say above 5 psig,the shell/casing design gets complicated and expensive though it can be done.
Due to higher heat transfer coefficients surface area required is lesser and hence gas pressure drop is also lower.
For multiple pressure designs as in gas turbine exhaust applications,water tube is the only choice.
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What are the 2 main types of boilers?
Fire tube and water tube. Steam Boiler and Water Boiler.
What is the difference between a Mac and an UZI?
Uzi has a high fire rate, and Mac has more accuracy but less fire rate
What is the difference between wet riser and dry riser?
A Dry Riser is a system of valves and pipework which enables the Fire Service to pump water on to the upper floors of a building. A Wet Riser is a system of valves and pipework which are kept permanently charged with water.
What is the major difference between noncombustible construction and fire resistive construction?
Basically non combustible and fire resistive are the same. Difference is non combustible has steel frame members that are unprotected or limited protected. Fire resistive has protected steel frame members with a fire rated material such as concrete.
Why are water tube boilers considered less dangerous than fire-tube boilers?
Advantages of fire tube boilers: - More residual heat in the water to allow for load swings - Simpler control systems due to larger volumes of water in shell - Water quality doesn't change as quickly due to larger volume of water Disadvantages of fire tube boilers - Maximum Allowable Working Pressure is limited due to larger surfaces exposed to pressure, to about 250 psi - Danger of a pressure part explosion due to failure of the shell and resulting rapid expansion of the large volume of water in the shell - Longer warm-up times due to the large amount of water in the shell. - Larger footprint than a water tube boiler of the same rating. - Less efficient per sq. ft. of heating surface since less of the water is in contact with heating surface due to a larger volume of water in the shell. Advantages of Water Tube Boilers - Rapid warming due to a much larger heating surface per pound of water in the boiler. - Easier to have a superheater if necessary - Virtually unlimited Maximum Allowable Working Pressure (within reason) - Smaller footprint than a fire-tube boiler of the same rating - Less working volume of water contained in the pressure parts - More water volume exposed to the heating surface than a fire tube boiler (more efficient) - Faster load change response due to less water - Less chance of a pressure part explosion due to less volume of water exposed to a rupture situation, plus, the rupture is usually into the furnace area which is safer. Disadvantages of a Water Tube Boiler - Must be more careful of feed-water quality - More complex control systems for drum level necessary due to smaller water spaces, (although I have worked in plants with old marine three drum boilers with huge steam drums which only had thermo-hydraulic regulators for drum level) - Operators must be quicker on the draw when there is an upset because everything happens faster with a water tube boiler Rahul Menon Twitter- @menenrahul
Difference between fire tube boiler and water tube boiler?
The difference between the two is that the Water tube boilers are safer and last much longer than the fire tube boiler. Their size is also larger and have a faster recovery time. However fire tube boilers have a low cost.
What is difference between vertical and horizantal boiler?
there are two types of boilers water tube and fire tube. fire tube boilers are divided in to two categories vertical and horizontal. this according to the construction of fire tubes. it is said that vertical boilers are inefficient than horizontal boilers. The vertical boiler is small capacity, and horizontal boiler is higher capacity, well, the horizontal boiler have many types according the drums, there are single drums boiler, and double drums boiler, while, the single drums boiler have fire tube boiler and water and fire tube boiler, double drums boiler is usually water tube boiler.
Which kind of water tubes are used for boilers?
fire tubes or water tubes
What are the 2 main types of boilers?
Fire tube and water tube. Steam Boiler and Water Boiler.
Difference between water tube boiler and fire tube boiler?
The answer is in the name. Boilers are made with a "tube - in - shell" construction, and the name implies what is in the tube. In a water tube boiler, the water circulates through the tubes, and the burner is usually under them. Most of the time, the "shell" of this style of boiler would not be watertight. A fire tube boiler has a watertight outer jacket with tubes through the center of it. The flame is shot through the tubes.
Why pressure is low in fire tube boilers?
Hot pressure
What are the difference between hydrant and hydrant monitor?
hydrant is the sub part of fire water network from which water shall be discharged to on fire parts, and from where the hydrants gets water is the monitor, i.e from monitor water shall be distributed to hydrants.
What are some applications for a water tube boiler?
Water tube boilers are used in marine and stationary applications. A water tube boiler heats by water flowing through tubes and being heated by fire externally.
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