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It is used to convert saturated or wet steam into dry steam for use in steam turbines, which are used for marine propulsion and the generation of electricity.
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Also used for steam feeding reciprocating engines such as railway locomotives. It is not just a matter of dryness. Superheating allows the steam to work as a gas for longer during its passage through the turbine or cylinder, hence increasing the thermal efficiency of the whole plant.
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What will happen if the superheater safety valve lift first in the boiler?
If the superheater safety valve lifts first the excess pressure will be relieved and no damage will be done due to overheating. This is a good thing and the way it should work. If the boiler safety valve were to open first there would not be enough of a steam flow through the superheater to "cool" the tubes of the superheater which could result in severe damage. +++ ??? That does not read right at all. For a start, steam only flows through the superheater when the engine cylinder or turbine is operating. Locomotive boilers' superheaters don't have safety-valves on them, and the regulator is upstream of the superheater, but they don't overheat when the regulator is closed. The boiler safety-valve would not lessen the flow of steam through the superheater anyway - its role is to vent excess steam hence prevent over-pressure in the boiler. A safety-valve on a superheater would similarly only protect the pipes from over-pressure, not from overheating.In fact it's difficult to think of a situation in which a superheater can be overheated to the point of damage. OK Let us look at your rebuttal to my answer and I will explain why you are wrong. First you say that steam only flows through the superheater when the engine cylinder or turbine is operating. This is true but it is the first indication that you don't really understand thermodynamics. The steam is not flowing but the temperature continues to rise. Just because the safety valve lifts you don't automatically shut off the fire and this heat continues to act on the superheater raising the temperature to a level where it could damage the metal of the superheater tubes. In other words, the superheater tubes get hot from the fire and the steam gets superheated by carrying this heat away. If this heat is not removed the tube overheats and becomes damaged. But hey don't take my word for it lets see what the experts have to say. In the 40th edition of Steam, Its Generation and Use by Babcock & Wilcox Chapter 23 Page 6 under Safety and relief Valves paragraph 6 and I quote "For drum boilers with superheaters, Babcock & Wilcox (B&W) prefers to follow the Code allowed procedure of setting the safety valves so that the superheater valve(s) lift first at all loads, thereby maintaining a flow of steam through the superheater(s) to provide a measure of over-heat protection."
When a function is used as an argument in another function?
It is called callback function. For an example see the qsort function.
Why a function is not defined in to another function?
A function is not deigned in to another function. It is because that would lead to dependency injection.
Can you declare a function in the body of another function in c language?
yes, we can not declare a function in the body of another function. but if we declare a function in the body of another function then we can call that very function only in that particular function in which it is declared; and that declared function is not known to other functions present in your programme. So if a function is required in almost all functions of your programme so you must declare it outside the main function i.e in the beginning of your programme.
What is the difference between a function pointer and a pointer to a function?
A pointer to a function is the memory address that stores the address of a function, while the pointer itself is a function pointer.A pointer to a function might be defined as "int (*pf)(int, int);", while to actually point to the function, you would use a function pointer, such as "pf = &func;".
What is the function of superheater?
The function of the super heater is to increase the temperature of the steam above saturation by utilising the heat from the flue gases.
Why is that you use 347H tubes in superheater in ammonia plant whereas in power plants the superheater tubes are of P22?
People who know about things like that at all, would know the answer, or at least ask a pro not WikiAnswers.
Which safety valve should be set to discharge at lower pressure drum safety valve or super heater safety vlave?
The Superheater safety valve must be the lowest set safety valve on any boiler, in order that flow through the superheater is maintained.If the drum valve were set lower the flow through the superheater would be disrupted on an overpressure.
When are superheater safety valves set to open?
after the main safety valves are open
What will happen if the superheater safety valve lift first in the boiler?
If the superheater safety valve lifts first the excess pressure will be relieved and no damage will be done due to overheating. This is a good thing and the way it should work. If the boiler safety valve were to open first there would not be enough of a steam flow through the superheater to "cool" the tubes of the superheater which could result in severe damage. +++ ??? That does not read right at all. For a start, steam only flows through the superheater when the engine cylinder or turbine is operating. Locomotive boilers' superheaters don't have safety-valves on them, and the regulator is upstream of the superheater, but they don't overheat when the regulator is closed. The boiler safety-valve would not lessen the flow of steam through the superheater anyway - its role is to vent excess steam hence prevent over-pressure in the boiler. A safety-valve on a superheater would similarly only protect the pipes from over-pressure, not from overheating.In fact it's difficult to think of a situation in which a superheater can be overheated to the point of damage. OK Let us look at your rebuttal to my answer and I will explain why you are wrong. First you say that steam only flows through the superheater when the engine cylinder or turbine is operating. This is true but it is the first indication that you don't really understand thermodynamics. The steam is not flowing but the temperature continues to rise. Just because the safety valve lifts you don't automatically shut off the fire and this heat continues to act on the superheater raising the temperature to a level where it could damage the metal of the superheater tubes. In other words, the superheater tubes get hot from the fire and the steam gets superheated by carrying this heat away. If this heat is not removed the tube overheats and becomes damaged. But hey don't take my word for it lets see what the experts have to say. In the 40th edition of Steam, Its Generation and Use by Babcock & Wilcox Chapter 23 Page 6 under Safety and relief Valves paragraph 6 and I quote "For drum boilers with superheaters, Babcock & Wilcox (B&W) prefers to follow the Code allowed procedure of setting the safety valves so that the superheater valve(s) lift first at all loads, thereby maintaining a flow of steam through the superheater(s) to provide a measure of over-heat protection."
what happen if superheater tubes are misalligment?
ummm noooo the superheat would burn the would
Why attemperation given between sh1 and sh2?
I assume that you are asking "Why is the attemperation water spray placed between the primary superheater and the secondary superheater?" This gives time for all the spray water to evaporate and still be effective at de-superheating, or attemperating.
What is the required Capacity size on Superheater safety valve?
the answer is 2, plus another 5 to be sure
What is the function of super heater?
A superheater increases the temperature of the steam for use in a turbine or an engine. Without the additional heat, a multi-stage turbine or engine will get moisture (water) in the lower pressure stages as the steam cools, causing erosion of the blades or cylinders.
When boiler use cyclone separator and why?
for the purpose of water-steam separation. High efficiency separation is very important in order to: - prevent water droplet carryover into the superheater, where serious thermal damage can occur. - prevent the carryover of solids entrained in water droplets into the superheater and turbine blading, where deposits may form, which are difficult to remove. These deposits end up reducing turbine efficiency and causing superheater tube temperature increases, distortion or even burnout.
Can 321 be used instead of 347H in superheater tubes?
no 321 can't be sued in place of 347H in place of superheater tubes in ammonia plant as in 321 when we weld craters devrlop which is not there in case of 347 H Niobium has more affinity than Titanium for carbon and high temperature stability of Niobium Carbide is more superior than Titanium Carbides
What is platen superheater?
it is a low pressure heater used in the boiler system in the thermal power plants to convert the saturated steam into super heated steam.
