3 replies to this topic

[Makarove]

Hello everyone. I hope you guys are doing fine.

 

I will start with a little background to let you understand the problem i am having. I am currently working in a glass manufacturing industry.

 

As the temperatures in summers rises upto 50 Celsius in my country so, I designed a shell and tube exchanger to cool down process air from an Air Blower (maximum pressure of air 0.6 bar). Design was done using HTRI and it successfully lowered air temperature from 78 C to 35 Celsius using chilled water at 22 Celsius. But the problem is during the current climate, with humidity, as soon as air temperature gets lowered than 35 C, moisture condensates and it comes out the outlet where the air is being used. We can stop the water condensing by reducing chilled water flow rate but i am looking for a possible solution to remove moisture (specially when condensed) from the air.

 

Using Moisture Separator is possible solution but as the air pressure being lower than 1 bar, wouldn't it further bring change into the pressure? the minimum pressure of air that is needed is 0.4 bar. The pipelin of air that is coming out of heat exchanger outlet is 6 inches in diameter. It would be helpful if you can point me in right direction to the possible solution to remove the moisture.

 

Thanks

[Pilesar]

You can reduce the absolute moisture content of the air by reducing its temperature (running the chiller harder) and then use a demister device to capture droplets. If you reheat the air after the chiller, you should have usable dry air. Research the web for 'compressed air dryer' to see if you find a fit for your needs. There are many ways to remove moisture from air. Using a desiccant is common. An air dewpoint of 35C is unusually high. If the moisture content in the air is that high, I would consider a direct contact cooler (water spray) upstream of your chiller exchanger to take the bulk of the heat out to save chiller energy. The air leaving the chiller would then be much cooler and the moisture content lower. You could then reheat the air after the chiller to bring it above its dewpoint. I think there is more than one good way for you to get dry air. You will probably affect pressure drop in some way, so determine the acceptable pressure range other than 'zero additional pressure drop.' The blower might be tweaked for higher discharge pressure if needed.

Edited by Pilesar, 12 July 2024 - 07:48 AM.

[breizh]

Hi,

Consider reading these documents to get ideas for your project.

Other possibility is the use of air dryer, check for compressor vendors (Atlas Copco for example). 

Breizh

Attached Files

•  Compressed_Air_Manual_Atlas Copco.pdf   5.91MB   9 downloads
•  Desiccant to remove Moisture instead of Glycol.pdf   470.96KB   11 downloads

[shvet1]

What is wrong with a condensate trap? What is an air consumers' worst moisture specification?

 

 

Attached Files

•  11.png   49KB   1 downloads