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Flue Gas Desulphurisation

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#1 Guest_Abdul rahman_*

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Posted 08 December 2003 - 11:30 AM

Dear chemresources,

Can anybody give me details about absorber design for flue gas desulphurisation using sea water?

Hope some body will help me in this regard

#2 pleckner


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Posted 10 February 2004 - 07:25 PM

I'm going to address this more general than specific. There are a number of absorber internals you can conisider, just do some leg work and talk to some vendors.

You are obviously looking at using the sodium as the key component but what's formed after the reaction is what I'm more conerned with. You will have exceptionally high concentrations of chlorides at elevated temperatures. This is about the worst combination you can have for metallurgy. Do some research on this. The Hastelloys may work but there may be other materials even better. Use the vendors for this as well. I would consider cooling the gas upstream of the absorber to minimize this problem.

Your diameter will be a function of your gas velocity and pressure drop. Don't allow either to get too high. You The sodium concentration of sea water isn't that great so I expect you will need a fairly high flow rate. One way of helping the situation may be to recirculate the sea water at each stage.

I hope this helps get you going.

#3 Guest_Ahmed Vawda_*

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Posted 16 August 2005 - 09:23 AM

Mr Raman

The use of sea water for flue gas desulphurization is quite successful. This "brilliant idea" is ecologically friendly as well if you think about it. The SO2 belched into the atmosphere will find its way into the sea after causing acid rain. So if you use sea water to this job, you skip the acid rain part.

Sea water has some bi carbonates which can remove a major amount of sulfur, thereby reducing the chemical consumption of soda ash. Sea water has a pH value of pH 7.5 – 8.5 and an alkalinity of approx. 100 – 110 mg/l as CaCO3 (in terms of CO3 -2 and HCO-3 )

SO2 + HCO-3  HSO4 -2

Best of all, remember, sea water is free. You will have to pump in some air into the sea water leaving the scrubber to oxidise it into the sulphate form.

Ahmed Vawda
HOD Technical Services

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