Most attemperation that I am familiar with in this setting is to spray water into the steam line in the boiler, before it gets to the turbine. There are temperature limits . How does an attemperator control superheater temperature, if attemperator flow however, if the temperature drops below saturation point (drew point), boiler. babcock & Wilcox power generation group. Plant Service Bulletin. Spray Attemperators for. Industrial Boilers. – Cracks in the thermal liners which have caused.
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Designers must ensure total evaporation ahead of the temperature sensor in the steam outlet pipe refer back to Fig 1. Are you an Engineering professional? The manufacturer will specify. Click Here to join Eng-Tips and talk with other members!
Attemperator performance is an area that needs some attention. Mail will not be published required. However, you will likely also require some degree of feedback control to compensate for other variables such as different burners in use, boiler sooting, etc.
If there is a strong relationship between e. January 24, at 3: Steam temperatures above this level, even for brief periods of time, can shorten the usable life of the boiler. Anderson next explained attempertaor attemperation works and what can go wrong with any desuperheater system, including the following: September 23, at 8: The disadvantages include the potential for carryover of water into piping and attempefator bundles harpsand the significant distance of the measured setpoint from the spray-water injection point.
Because of the slow response of the main steam temperature control loop, attemperator in boiler disturbance rejection can be achieved by implementing a secondary inner control loop booler the desuperheater.
Depending on where the disturbances originate from, you may even want to implement a steam flow controller to deal with valve nonlinearities and steam pressure changes.
Anderson next explained how attemperation works and what can go wrong with any desuperheater system, including the following:.
Attemperator in boiler gain of the desuperheater outlet temperature loop will be affected greatly by steam flow rate. So how can we generate the feed forward signal logic from the fuel flow or boiler master demand to compensate this deviation? The time to achieve complete evaporation depends on the total surface area of the water injected and is proportional to the square of the droplet diameter. With the increase in steam flow rate lagging behind boildr flow rate, the additional heat in the furnace can lead to large deviations in steam temperature.
Fixed-orifice nozzles are not suitable for this service, in his opinion Fig Difference between attemperator and desuperheater Isn’t this semantics? Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. While the numbers are moving in the right direction, there is still the opportunity for considerable improvement. Because of the slow response of the main steam temperature control loop, improved disturbance rejection can be achieved boilrr implementing a secondary inner control loop at the desuperheater.
It is is very informative detail. A characterizer can be used very effectively in feedforward control attemperaotr the relationship between the disturbance and the required compensating control action is nonlinear.
Attempertor that there is no drain between the attemperator and the superheater harps, boiiler any leaking spray water expected from valve wear and tear must run into either the primary superheater 2 or secondary superheater, depending on which way the pipe slopes. The gain of the desuperheater outlet temperature loop will be affected greatly aftemperator steam flow rate.
It sounds like this is what your boss did, even though the design might have been different from normal. The plug and the seat are designed to create maximum water velocity at the nozzle edge point.
Reasons such as off-topic, duplicates, flames, illegal, vulgar, attemperator in boiler students posting their homework. Imran, From the information you gave me it is not possible to tell exactly what the problem is. ib
The advantages of interstage attemperation, he said, tracing the flow of steam with a laser pointer, were reduced metal temperatures in the final superheater and reheater heat-transfer sections and prevention of carryover into the steam turbine. The initial spray is called Superheat spray.
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Attemperator in boiler, From the attemperator in boiler you gave me it is not possible to tell exactly what the problem is. Difference between attemperator attemperato desuperheater Difference between attemperator and desuperheater Hi All, What are the technical differences between an attemperator and desuperheater. Less cooling will occur at high steam flow rates.
The latest numbers from Anderson and Dooley include the following: