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UER Store
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sweet UER decals:
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Activity
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908 online
Server Time:
2024-05-06 23:23:40
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| Posted by nostra-YOUPPI! |
4/15/2007 5:48 AM | remove |
hmmm green liquor wonder if it tastes like creme de menthe
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| Posted by tijeff |
4/15/2007 3:34 PM | remove |
Miiaaammm
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| Posted by Samurai |
4/19/2007 8:07 PM | remove |
LOL...
Here's how the whole liquor thing works.
You make paper from wood chips. They are carried up a conveyor to a steaming vessel where the chips are steamed to make them nice and gooey. From there they go up the top seperator at the very top of the digester... the chips get exposed to caustic soda and white liquor, which is a cocktail of different caustics and steam... you want to seperate the wood fiber from the lignen that holds the wood together... As the chips progress down the digester, more and more of the lignen and 'whatever' are cooked off and turn the white liquor to black liquor. At the bottom of the digester, the cooked brown pulp goes one way to the washers and the black liquor gets pumped to the powerhouse where it is injected into the recovery boiler. The recovery boiler turns it to a molten 'smelt', burning off all the impurities (basically the lignen and 'whatever'). The molten smelt is dropped into a tank of cold water at the bottom of the plant where it instantly 'shatters' and gets stirred up, forming 'green' liquor. A joke over in the power house is that if you don't hear things booming and rolling and the building isn't shaking, RUN! Anyways, the green liquor gets pumped over to the recaustization where it gets cleaned and converted back over to white liquor to be reused in the digester. It's a closed loop system and set up so if one part doesn't run, none can run.
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| Posted by Samurai |
1/6/2009 3:57 PM | remove |
by the way, the recausticization process is kind of neat. Green liquor from the recovery boiler is pumped to recaust into the green liquor clarifier. The dregs, which is more or less unburned crap, carbon, whatever, settles to the bottom. That crap is called dregs and gets pumped to a dregs washer where it is sucked onto a wire, the remaining green liquor is sucked ou of it anda screw sends it out to a containment where it gets trucked to the landfill. The green liquor goes from the clarifier to the slaker which is more or less a big Kool-Aid pot. So much green liquor is mixed with so much lime to make white liquor. From the slaker, the white liquor goes through three causticizers which basically add retention time to the process and build strength of the liquor. From the causticizers, it goes to the white liquor receiver tank and over to the white liquor clarifier which does just what it sounds like. The lime mud drops out of solutions in the clarifier and sinks to the bottom where the white liquor underflow pumps send the mud back to the mud washer and the white liquor overflow pumps send the white liquor to one of the two white liquor storage tanks where it is then pumped to the digester in the pulp mill.
Now the mud that went back to the mud washer? That goes into a tank where it is 'washed' and then set back to a washer that, again, gets any remaining liquor out of the mud and then introduces it to the lime kiln... the mud travels down the kiln, heated to 490F at the back end, 2400F at the front end, and gets reused in the slaker.
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