why IBD Vent is kept at higher elevation than CBD ?
- 5 Answers
- 18254 Views
- I also Faced
- E-Mail Answers
Answer Posted / shahnawaz ahmad
Intermittent blowdown better known as bottom blowdown or mud drum blowdown is done to remove undissolved solids from the mud drum of a boiler or from the bottom of the shell of a fire tube boiler. Some boilers operated at high pressure with super clean water dont need this very often. The pipe from the mud drum goes to a tank the purpose of which is to reduce the pressure to atmospheric and to reject heat so that the water/mud mixture is cool enough not to damage the sewer lines or whatever fixtures it flows to. This tank is the intermittent blowdown tank or the atmospheric blowdown tank since it is vented to atmosphere.
The continuous blowdown tank is a flash tank used to collect heat from the water that is continuously drawn from the steam drum in order to control the dissolved solids. As water is boiled off to steam in the steam drum anything that will not evaporate is left behind and this will increase the concentration of dissolved solids in the boiler water. This is bad because the solids will precipitate out and form scale which must be removed chemically and water with high solids concentration will start to foam which will cause level control problems and will also result in material carrying over with the steam resulting in deposits in the superheater tubes and headers. To control this some of the high concentration boiler water is drawn off and replaced with lower concentration feed water.
This flows to a tank at a lower pressure than that in the drum and some of the water flashes to steam, which can be used to heat feedwater or what have you. The liquid left over can be used in a heat exchanger to heat make-up water or it can flow through a standby boiler to keep it warm and to maintain the chemicals in the water or to the circulating water in a cooling tower or to the atmospheric blow down tank.
| Is This Answer Correct ? | 5 Yes | 1 No |
Post New Answer View All Answers
why do you consider yourself a suitable candidate for this position
procedure of how to generate power in solar plant.
By any way can we increase the B check hours from 300 to 500
what is the basic use of power plant in equipment
some one can tell me how residual type excitation is provided through transformers to an AC generator without any battery or PMG&excitor
can dp type level transmitter work in under vaccum condition
Looking for Bently Nevada surplus 3300/52-01-00-00 Reverse Rotation Monitor , 4 pieces.
LAPT working in alternator / generator
How to calculate power press toneage
can u please tell me how to calculate the concrete quantity for a under reamed pile? r=300mm,depth=3m for a cylinder and for bulb l=.750mm,width=.525
our 125 kva DG does not start in AUTO mode works normally in MANUAL mode please give me a solution.....
operation
dear sir i have completed one year post diploma certificate in thermal power engineering from national power training institute durgapur ...plz suggest me for power sector job
how to differentiate between "ALL fuel lost" and "All Fuel Lost" in Boiler MFT condition?
Qatar Fertiliser Company (QAFCO) Shortlisted me for interview (got the intel from my source) for Field Operator- Utilities post. Please let me know what kind of questions they asked? ... this position requires 5 years of experience in Power Plant and background Diploma in Electrical/ Mech. ... my Background is Electrical and I am a sub Assistant Engineer (Operation) at a private HFO based Power plant... PS: Please Let me know what preparation should I take to obtain the Interview which will be take place In Bangladesh soon
