Flash Steam from steam trap

[HAMZAAHMED]

There are two outlet from steam traps " liquid condensate and the Flash Steam that its going to air"

the liquid condensate recover and reuse as feed in our boiler .

But i want to ask , how i can reuse and take the benefit of flash steam that its going to air ?

* boiler capacity 30 Ton/ hr , 16 bar

Thanks

 

[katmar]

You should not vent flash steam at the trap. It is dangerous and leads to corrosion of the surrounding steelwork. The condensate should be taken to a collection vessel, and allowed to flash there. The flash steam is either condensed as it vents from the collection vessel and returned to the vessel, or it can be taken to the suction port of a thermocompressor and reused, thus giving some energy savings. See

http://www.spiraxsarco.com/documents/TI/p493_02.pdf

Katmar Software - AioFlo Pipe Hydraulics

http://katmarsoftware.com

"An undefined problem has an infinite number of solutions"

 

[aliansari]

Condensate is directly taken to the flash vessel as you were told by katmar. Once the condensate enters the flash vessel, a portion of condensate (depending on the pressure differential between steam main and the flash vessel) is vented. One possible use may be, diverting this flashed steam towards a low pressure application of your boiler feed water deaerator. if you can operate your flash vessel above the operating pressure of your deaerator. The flash steam line may be connected downstream of the deaerator pressure control valve, installed on the low pressure steam connection for the deaerator

 

[don1980]

Can the steam evolving from steam traps be reused? Possibly so. Should this steam be reused? That's the question to evaluate first. If it's economical to recover the steam, then the obvious answer is yes, but it won't be economical unless we're talking about a high amount of condensate that is also at a high pressure. If that's what you have, and you have a nearby condensate flash drum that operates at a lower pressure than the condensate source, then route it to that drum. If those things are not true, then it's very unlikely that a project to recover this steam has a positive economic value.

The economics of an energy recovery project aimed at reducing steam usage, or increasing recovery of steam, can easily be oversimplified. Say you're looking to optimize a low-pressure steam system, and let's say that all of that steam originates from a 600# system let-down control valve. The cost (value) of that steam is relatively high. Now consider another case in which that low-pressure steam originates from a 600# system, but in this case the low-pressure steam is the exhaust of a steam turbine (driven by the 600# steam). In this case the value of that low-pressure steam is relatively low.

For a large integrated plant (refinery or chemical plant), the economic analysis of energy recovery projects is surprisingly complex. Accurately determining the value of different levels of steam is the complex part. If a facility doesn't have a reliable steam valuation model, it's easy to be fooled into thinking that there's justification for recovering vented steam, when in reality the most economical option is to vent it to the atm.