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.