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Spray Quench Column Design


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#1 ufocfte

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Posted 11 November 2016 - 03:04 PM

We are currently designing a co-current spray column to cool a 200 °C flue gas to about 65 °C using approximately 25 °C spray water.   The key design parameters are:

 

Flue Gas Flow Rate:  2000 kg/hr;

Flue Gas Composition: 5~6 vol% CO2; 8~10 vol% O2; 10~30 vol% H2O; and the rest is N2;

Flue Gas Inlet Temperature: 200 °C.

 

We are considering to use multi-stage spray nozzles in the column.  However, we have some unresolved questions:

 

1) What are the criteria to determine the size of column? Specially, what is the reasonable superficial velocity of the flue gas, and what is the required residence time.  We currently select the column size to be ID of 500 mm and Height of 2500 mm.  Does it sounds reasonable?

 

Typically the co-current column has faster heat transfer than counter-current column, but how faster the equilibrium can be reached when two streams with different temperatures contact together? 

 

2) How to locate the spray nozzles?  What distance should be kept between the nozzles?  Should the spray nozzles be kept close to the top section of the column as possible?  

 

 

 

Thanks for any hints and suggestions!


Edited by ufocfte, 11 November 2016 - 03:06 PM.


#2 PingPong

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Posted 12 November 2016 - 06:27 AM

Just some remarks:

 

Why would you want to cool the fluegas in a spray column instead of in a heat exchanger or aircooler?

Or why bother too cool it at all, why not sent it to atmosphere at 200 oC?

 

You say the fluegas contains 10 to 30 vol% H2O. That is a big range, and the actual H2O content has a an impact on the duty to be removed.

At 65 oC & 1 atm, at the outlet of the spray column, the fluegas will be watersaturated and contains 25 vol% H2O (see steam table), so if the inlet fluegas contains 10 vol% H2O then it will vaporize part of the spray water, but if the inlet fluegas contains 30 vol% H2O some of that water vapor will condense into the spray water.

 

The amount and exact temperature of the spray water will also have a big impact on the required column size, especially because you intend to use a co-current column, in which the water outlet temperature has a much bigger impact on the LMTD than in a counter-current column..


Edited by PingPong, 12 November 2016 - 06:32 AM.


#3 Bobby Strain

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Posted 12 November 2016 - 09:41 AM

You should enlist the services of a qualified engineer.

 

Bobby



#4 breizh

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Posted 13 November 2016 - 06:12 AM

Hi ,

Consider the document attached , you may find pointers.

 

Hope this helps .

Breizh






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