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[keby7lkv]

Hi,

Currently I am designing a scrubber for final year design project. The CATOX(catalytic oxidation reactor) would oxidize the organic contained and the outlet streams passing through expander and recover the energy. The outlet condition of CATOX is 9.5bar and 350C. After reducing the pressure into 1.3bar, the stream is cooled to 70C and send for vent gas treatment.

The flowrate into the scrubber is very large(8000kmol/h), and at 1.3bar, 70C. The scrubber is to eliminate the HBr contained, which is around 80ppm and required to be treated into 1.5ppm vol/vol basis. The main component of the inlet is nitrogen. Random packing is being used. With that large amount of flowrate, I have calculated the L/G for the system, normally the L/G would be larger for absorption, means that definitely the L required for absorption would be more than 8000kmol/h. With such a large amount of flowrate, is that possible to design it? I have calculated the diameter, with using larger size of packing, the diameter is 4-5m. I am afraid of the super huge size absorber is required for the vent gas treatment.

Is there any other method to get rid of nitrogen before putting the air into the system? or pre-treatment is required before scrubbing?

I have attached the details about inlet stream of scrubber.

thanks.

Attached Files

•  data for inlet stream of scrubber.xls   114KB   205 downloads

[andy66]

Dear friend,

the scrubber diameter is related to gas flowrate!

Water flowrate could be reduced until 2000 - 3000 kmole/hr, using a chemical reactant (maybe NaOH or CaOH) in order to reduce column height. But diameter is always the same!!!

I think that CATOX is a catalityc oxidation reactor so you need air for combustion: probably using pure O2 in substitution of air could reduce the size of all your equipment including scrubber.

So the result could be a CAPEX reduction for the project but an increase of operational costs!!!

Regards
Andy

Edited by andy66, 08 April 2011 - 10:45 AM.