10 replies to this topic

[ksagarzazu]

HI everyone, we are trying to size a scrubber fan to replace the existing one, we have no information of the existing, neither paper trail or info in the equipment itself.

 

The process pump that transfer HNO3 from the bulk tank to the mixer has a maximum flow rate of 1.5m3/hr

The mixer has a design pressure = atmospheric so its not FV.

 

am I right to assumed maximum fan flow rate needs to be 1.5m3/hr?

 

Should I do a hydraulic calculation to check the losses in the vent pipework?

 

Can you advice?

 

Thanks in advance

[breizh]

Hi,

You need to perform a mass (mole) transfer calculation together with a hydraulic calculation. 

If your system is still in service, you may be able to measure the flow rate (velocity) using a pitot tube or other flow rate devices and get pressure drop after installing gauges.

Good luck

Breizh

Attached Files

•  henry.pdf   600.09KB   11 downloads
•  EPA absorption.pdf   1.06MB   17 downloads

[fallah]

HI everyone, we are trying to size a scrubber fan to replace the existing one, we have no information of the existing, neither paper trail or info in the equipment itself.

 

The process pump that transfer HNO3 from the bulk tank to the mixer has a maximum flow rate of 1.5m3/hr

The mixer has a design pressure = atmospheric so its not FV.

 

am I right to assumed maximum fan flow rate needs to be 1.5m3/hr?

 

Should I do a hydraulic calculation to check the losses in the vent pipework?

 

Can you advice?

 

Thanks in advance

 

Hi,

 

To get a proper response please upload a simple sketch of the system you described...

[ksagarzazu]

 Handwritten_2024-01-07_183951.jpg   14.02KB   6 downloads

 

HI everyone, we are trying to size a scrubber fan to replace the existing one, we have no information of the existing, neither paper trail or info in the equipment itself.

 

The process pump that transfer HNO3 from the bulk tank to the mixer has a maximum flow rate of 1.5m3/hr

The mixer has a design pressure = atmospheric so its not FV.

 

am I right to assumed maximum fan flow rate needs to be 1.5m3/hr?

 

Should I do a hydraulic calculation to check the losses in the vent pipework?

 

Can you advice?

 

Thanks in advance

 

Hi,

 

To get a proper response please upload a simple sketch of the system you described...

 

Hi

 

I hope the sketch of the system its clear

 

Thanks again

 

[latexman]

What is the maximum fill rate of the Bulk Tank?

Minor point, probably just my curiosity, is it possible for the Bulk Tank to be filling and the Bulk Tank to be filling the Mixer simultaneously?

I suspect the 1.5 m3/hr is correct, but please answer the above.

[breizh]

Hi,

Weird!

To me the blower should be on the top of the scrubber and its size should be in line with the flow rates (2 inlets) coming from the Bulk tank + mixer.

What is the scrubbing solution?

https://torch-air.co...c-acid-scrubber

 

Breizh 

[fallah]

Handwritten_2024-01-07_183951.jpg

 

Hi,

 

To get a proper response please upload a simple sketch of the system you described...

 

Hi

 

I hope the sketch of the system its clear

 

Thanks again

 

Hi,

 

Based on the sketch you provided, appears maximum fan flow rate needs to be 1.5m3/hr...but you can consider a design margin, say 10%, for the filling pump operating at end of its curve...

[ksagarzazu]

What is the maximum fill rate of the Bulk Tank?

Minor point, probably just my curiosity, is it possible for the Bulk Tank to be filling and the Bulk Tank to be filling the Mixer simultaneously?

I suspect the 1.5 m3/hr is correct, but please answer the above.

No, both operations can not be perform at the same time. Current operation for bulk tank filling is 24m3/hr, but it does not uses the fan, new operation will be blowed instead of pumped.

[ksagarzazu]

Hi,

Weird!

To me the blower should be on the top of the scrubber and its size should be in line with the flow rates (2 inlets) coming from the Bulk tank + mixer.

What is the scrubbing solution?

https://torch-air.co...c-acid-scrubber

 

Breizh 

Scrubbing solution is just water.

[breizh]

Hi,

I still don't understand your operation or description of the process. This is a counter current process meaning water is sprayed on the top of the column and gas streams are located at the bottom. You should have check valves on gas lines to prevent cross contamination or bypass.

Note:

Your recirculation line should be equipped with a heat exchanger to cool down the solution (absorption being an exothermic process), not related to the blower capacity.

 

Edit: Attached a design of scrubber for monomers vapors

 

Good luck.

Breizh 

Attached Files

•  caustic wash.pdf   109.8KB   14 downloads

[lakshmi.narayanan]

Handwritten_2024-01-07_183951.jpg

 

HI everyone, we are trying to size a scrubber fan to replace the existing one, we have no information of the existing, neither paper trail or info in the equipment itself.

 

The process pump that transfer HNO3 from the bulk tank to the mixer has a maximum flow rate of 1.5m3/hr

The mixer has a design pressure = atmospheric so its not FV.

 

am I right to assumed maximum fan flow rate needs to be 1.5m3/hr?

 

Should I do a hydraulic calculation to check the losses in the vent pipework?

 

Can you advice?

 

Thanks in advance

 

Hi,

 

To get a proper response please upload a simple sketch of the system you described...

 

Hi

 

I hope the sketch of the system its clear

 

Thanks again

Hi,

As for the scrubber system, blower should be in the outlet of the scrubber. Static pressure of blower should be designed to overcome the pressure loss in duct and pressure loss in scrubber.

 

Lakshmi narayanan