Carbon Dioxide Handling

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munish_prashar Active Contributor Join Date: May 2009 Posts: 16	Carbon Dioxide Handling 05/04/2011 6:41 AM
	Hi We have following flow diagram Battery of CO2 Cylinders ---- Header ----- Heater at 65 deg C ------Pressure reducing valve from 70 bar to 10 bar (No. 1 ) ------safety valve ------ pressure reducing valve from 10 bar to 1.5 bar (No. 2) -------safety valve --------ball valve ---- flow meter -----to process tank. The problem is that after some time of starting the process the flow rates are achieved upto 25 kg/hr but after that the pressure reduces to less than 2 bar at PRV no. 1 and flow rate reduces to almost 0. we are unable to understand why flow is stopping in between. Regards Munish Prashar
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ozzb Guru Join Date: Mar 2007 Location: Rosedale, Maryland USA Posts: 5197 Good Answers: 266	#1 Re: Carbon Dioxide handling 05/04/2011 7:03 AM
	The regulation valve maybe freezing up. What's it temperature? And is it rated to operate at that temperature? __________________ Life is not a journey to the grave with the intention of arriving in a pretty, pristine body but rather to come sliding in sideways, all used up and exclaiming, "Wow, what a ride!"
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#2 Re: Carbon Dioxide handling 05/04/2011 7:15 AM
	It looks like the Joule-Thompson expansion effect is getting in the way. Increase the heater outlet temperature. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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JohnDG Guru Join Date: May 2006 Location: Reading, Berkshire, UK. Going under cover. Posts: 9684 Good Answers: 468	#3 Re: Carbon Dioxide Handling 05/04/2011 8:04 PM
	Is the heater correctly rated - i.e. is it capable of heating the CO₂ to 65° at that flow rate? Have you done the sums? Does it work consistently at lower flow rates? Try running it and going over the system with a hot air gun (a hair dryer will do at a pinch) to see whether extra heating is needed anywhere. __________________ "Love justice, you who rule the world" - Dante Alighieri
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munish_prashar Active Contributor Join Date: May 2009 Posts: 16	#4 In reply to #3 Re: Carbon Dioxide Handling 05/05/2011 1:40 AM
	Thanks for your inputs , we have heated the PRV 1 and also bypassed it by controlling needle valve provided for fixing pressure gauges , now the flow is coming from bypass line as welll as little flow from PRV1 till the time we replace the PRV 1
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