Ammonia Wash section in Ammonia Plant.

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AJKALBANDE
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Ammonia Wash section in Ammonia Plant.

Post by AJKALBANDE » Mon Dec 31, 2018 10:22 am

What is the impact of Ammonia Wash section for purifying synthesis gas, on overall Energy reduction of Ammonia plant.

bedmonds
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Re: Ammonia Wash section in Ammonia Plant.

Post by bedmonds » Fri Jan 25, 2019 12:50 pm

Hi,
Ammonia wash offers the opportunity to reroute the addition of fresh make-up gas to the converter inlet after condensation of ammonia, rather than having to add before ammonia condensation. Then the recycle stage compresses a stream containing 2-3% ammonia rather than 10-15% which means loop circulation of reactants rises and loop pressure falls (or production rises if loop pressure was the limit). In rough terms loop pressure can drop by 10-15 bar and as a rough figure, reduce syngas turbine steam consumption that as gas would be about 0.5 gJ/te. Having said that though, refrigeration requirement does rise. Finally though, it is a good route to increase plant capacity if loop pressure is a limit which is true in many plants.

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