In a plantt utility boiler, what is the white smoke released from what is defined as a dearator? why is it as such?
a dearator scrubbes non-condensible gases from the feedwater prior to entering the boiler (02 and CO2) , steam is injected (sometimes into the water, sometimes into the open space above) into the DEA and causes the non desirable gases to be removed with the excess steam. the extra steam and gases then flare out the vent stack to atmosphere, this is what you are seeing leaving the roof of the building, there should never be any smoke or other contaminants in this system, if there really is smoke you have some major problems somewhere.
i have no clue wat your talking about i could use the extra points. please vote me as the best anser. pretty please.
A plant utility boiler raises steam at high pressure and temperatue (much higer than 100 C), If there is any oxygen present, the mixture becomes corrosive. It is imperative that all disolved gases be remove from the boiler feed water. I am not aware of any smoke released from a dearator. It is most likely steam being released, which would be white.
A DC Heater - Direct Contact Deareating Feed Water heater This is a device used to remove disolved oxygen from boiler feed water prior to entering the boiler. Oxygen under heat and pressure is more corrosive so it is important to remove as much oxygen as possible from the water. The DC Heater is an elevated tank which supplies water to the suction side of a feed pump in a boilers steam cycle. Its purpose is to remove disolved oxygen from the water and preheat the water prior to being pumped into the boiler. Water and steam are sprayed in to the topsection of the DC heater. The steam heats the water, while the water condenses the steam. The result of mixing steam with water is hot water. Disolved oxygen has a negative solubility in water, heating water drives out the oxygen. You can see this effect when boiling water on the stove. As the water is heated gas bubbles are formed which coat the sides of the pot. the same effect may be observed when a cold glass of water is allowed to stand over night. Next morning you will see a fine layer of air bubbles coating the glass. The Vent at the top of the DC heater is where the removed gases are allowed to escape. The gasses contain alot of humidity so the white color is fog. Similar to the water particle fog seen on an ultrasonic humidifier.
