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Anonymous Poster

measurement of pulp flow

08/23/2008 10:40 AM

Does the combination of magnetic flow meter and consistency transmitter(with acontroller) in a discharge line of a particular cooking system in a pulp industry gives correct flow of pulp in terms of mass say ----tons/day ?what are the factors to be considered to arrive at a nearby reading?The pulp consistency would be around 10.5%. What we notice is that there is a large variation in the measured value and the calaculated value.what is a normal practice in a pulp (based on using wood as basic rawmaterial) manufacturing industry to report the production

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Guru
Engineering Fields - Instrumentation Engineering - New Member Hobbies - Fishing - New Member

Join Date: Jan 2008
Location: Kazakhstan
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Good Answers: 8
#1

Re: measurement of pulp flow

08/23/2008 1:36 PM

It will give you a suitable integrated informative parameter for best response from yours plant operating personnel.

Summary inaccuracy consists of both flow's and consistency's inaccuracies.

In terms of tons a day[week, month] will be achieved more relevant data than in terms of tons a hour.

I said more relevant as I'm avoiding to use "accurate" as it depends on what adjusting method you're intedning to apply for described instrumental system.

Long time observation hopefully give you a clue afterwards how to correlate obtained data to production output for best overall perfomance.

Good luck.

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Commentator

Join Date: Jun 2008
Posts: 77
#2
In reply to #1

Re: measurement of pulp flow

08/23/2008 10:57 PM

Thank you.If you have any access to the Pulp & Paper industries i appreciate if you could get their normal practice of reporting the unbleached pulp production from the digester.What can be the accuracy of the consistency of the transmitter can be expected.

vasu

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Guru
Engineering Fields - Instrumentation Engineering - New Member Hobbies - Fishing - New Member

Join Date: Jan 2008
Location: Kazakhstan
Posts: 753
Good Answers: 8
#3
In reply to #2

Re: measurement of pulp flow

08/24/2008 2:09 AM

Unfortunatelly I have no access to Pulp & Paper industries though I worked at 199s in printing house. As instrumental and control engineer I'd been hired worked and working now for projects mostly tied with metallurgical and ore enrichment processings.

I'm working now over project where i have to merge data from belt scales and instrumental analyzer (X-Ray or magnetic for magnetic ore). Both of these instruments (belt scales and analyzer) have no high accuracy in its measurements, 2% and 5% respectively. So theoretically we're expecting here an error more than 5%, but this new merged parameter (quantity of iron passed by conveyor into magnet separator) hopefully shall give a good point for personnel how they must control process without need to wait calculated parameters.

You said that you have consistency transmitter. I do not know its operating principle and how it should be adjusted. But something says me that its accuracy is not too significant for real industrial condition. Non the less I believe that your move is arguably useful for improving overall production quality.

Any kind of any information is better than lack of one. No matter its accuracy.

Good luck.

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