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Hi;
We got some problem about co2 flow for basic calculation in the plant load in the urea plant. Is it possible to calculate co2 from the suction or discharge compressor as basic calculation?? If possible which one is the best discharge or suction?? what istrumentation (flowmeter) is good for this gas calculation??
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Co2 Flow For Basic Calculation Plant Load
Started by Guest_gimin_*, Apr 14 2004 04:32 AM
3 replies to this topic
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#2
Art Montemayor
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Posted 14 April 2004 - 09:57 AM
gimin:
The quality of an output (answer) can only be as good or detailed as the input (basic data) given. You've given little, if any, basic data. You haven't given flowrate, pressures, temperatures, type of compressor, and degree of measuring accuracy you need or want.
1) Yes, it is possible to calculate the CO2; what's more, you can calculate the flowrate of a reciprocating compressor knowing it's cylinder diameter, stroke, action, and volumetric capacity. After all, a reciprocating machine is really a measuring device in that it is a positive displacement apparatus.
2) Either discharge or suction streams can be measured with an instrument - if the flow is steady (as in a centrifugal compressor);
3) An instrument can't be selected without knowing all the parameters found in a detailed description of basic data. If you don't state the flowrate, pressure, temperature, mol.wt., composition, accuracy needed, etc., etc. nothing much can be said.
Communicating your problem correctly and sufficiently is your first step to obtaining assistance from others.
The quality of an output (answer) can only be as good or detailed as the input (basic data) given. You've given little, if any, basic data. You haven't given flowrate, pressures, temperatures, type of compressor, and degree of measuring accuracy you need or want.
1) Yes, it is possible to calculate the CO2; what's more, you can calculate the flowrate of a reciprocating compressor knowing it's cylinder diameter, stroke, action, and volumetric capacity. After all, a reciprocating machine is really a measuring device in that it is a positive displacement apparatus.
2) Either discharge or suction streams can be measured with an instrument - if the flow is steady (as in a centrifugal compressor);
3) An instrument can't be selected without knowing all the parameters found in a detailed description of basic data. If you don't state the flowrate, pressure, temperature, mol.wt., composition, accuracy needed, etc., etc. nothing much can be said.
Communicating your problem correctly and sufficiently is your first step to obtaining assistance from others.
#3
Guest_gimin_*
Guest_gimin_*
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- guestGuests
Posted 14 April 2004 - 11:51 PM
Sir,
We have Centrifugal compressor with suction pressure 20 Kpa and discharge 4 th stages is 14 Mpa. and flow 39 KNM3/hr. So if we take calculation from the suction is it accurate than from discharge. And in the feed we inject also with process air to achieve O2 data around 0.60
We have Centrifugal compressor with suction pressure 20 Kpa and discharge 4 th stages is 14 Mpa. and flow 39 KNM3/hr. So if we take calculation from the suction is it accurate than from discharge. And in the feed we inject also with process air to achieve O2 data around 0.60
#4
Guest_Ashwani Kaul_*
Guest_Ashwani Kaul_*
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- guestGuests
Posted 17 April 2004 - 04:35 AM
I am also grappling with problem of CO2 measurement in CO2 Compressor of urea plant. We have 3 recip compressors with provision for flow measurement through single orifice in common suction line. Total flow is 20,000 NM3/Hr.
However, the orifice measures CO2 gas as it comes out CO2 Stripper cooler.It thus has H2, N2 and is saturated with water vapour.Further Air is added as in your case.The flow of CO2 ( pure 100% CO2 basis) neds to be computed.
We are getting CO2 consumption of 0.8 T CO2/T Urea which is high.We suspect that there are leakages in packing of compressor and other losses.In order to cross check, we are planning to install orifice at outlet of Compressor to exactly determine leakage within compr.However, in discharge line, pressure is high ( 200 atm in our case) and CO2 gas is much away from ideal conditions.The corrections for orifice have to be suitably made for accurate flow measurement. I am therefore on lookout for more reliable flow measurement method.
It would be helpful if you could share problems you are facing ande also the steps taken in your design to reduce losses.
Ashwani
However, the orifice measures CO2 gas as it comes out CO2 Stripper cooler.It thus has H2, N2 and is saturated with water vapour.Further Air is added as in your case.The flow of CO2 ( pure 100% CO2 basis) neds to be computed.
We are getting CO2 consumption of 0.8 T CO2/T Urea which is high.We suspect that there are leakages in packing of compressor and other losses.In order to cross check, we are planning to install orifice at outlet of Compressor to exactly determine leakage within compr.However, in discharge line, pressure is high ( 200 atm in our case) and CO2 gas is much away from ideal conditions.The corrections for orifice have to be suitably made for accurate flow measurement. I am therefore on lookout for more reliable flow measurement method.
It would be helpful if you could share problems you are facing ande also the steps taken in your design to reduce losses.
Ashwani
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