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SO3 in Flue Gases
- Thread starter yulinios
- Start date
athomas236
Mechanical
rmw,
The second thread in your post is about the aire pressure distribution around a telescope dome. Was this your intention,
athomas236
The second thread in your post is about the aire pressure distribution around a telescope dome. Was this your intention,
athomas236
Yulinios, the 1200 mg/Nm3 refer to SO2, right ?
There is enough moisture in the flue gases to enable the formation of sulfuric acid when the SO2 converts to SO3.
This humidity comes from a variety of sources, such as hydrogen in the coal composition, free moisture in the coal, moisture in the combustion air.
What is exactly that you wish to find ? Is it the amount of SO3 formed ? Please clarify.
There is enough moisture in the flue gases to enable the formation of sulfuric acid when the SO2 converts to SO3.
This humidity comes from a variety of sources, such as hydrogen in the coal composition, free moisture in the coal, moisture in the combustion air.
What is exactly that you wish to find ? Is it the amount of SO3 formed ? Please clarify.
athomas236
Mechanical
Vulinios,
Why not just buy a dewpoint meter. I think there is a UK company called Land that make such a meter.
athomas236
Why not just buy a dewpoint meter. I think there is a UK company called Land that make such a meter.
athomas236
- Thread starter
- #7
Hi Everybody
Thanks for your valuable answers, our coal boiler sometimes needs to work at minimum load (wich is less than the manufactures manual indicates), the temperature of flue gases in the exit of Chimney at design load is 132 C (295 F) it decreases at minimum load to values as low as 107 C (250 F), so I was looking information in the book "Combustion Fossil Power" where I found a Curve "temperature of flue gases vs PPM SO3", since we have a SO2 meter on line I was thinking the ways to calculate SO3 if it is possible or take samples to measure it, set one alarm in control room is one thing that I would like to get.
Thanks again
Bye there
Thanks for your valuable answers, our coal boiler sometimes needs to work at minimum load (wich is less than the manufactures manual indicates), the temperature of flue gases in the exit of Chimney at design load is 132 C (295 F) it decreases at minimum load to values as low as 107 C (250 F), so I was looking information in the book "Combustion Fossil Power" where I found a Curve "temperature of flue gases vs PPM SO3", since we have a SO2 meter on line I was thinking the ways to calculate SO3 if it is possible or take samples to measure it, set one alarm in control room is one thing that I would like to get.
Thanks again
Bye there
From a ChE Plant Notebook article published Feb.9, 1981, titled "Predicting dewpoints of acid gases" by Yen-Hsiung Kiang (Trane Thermal Co.) for sulfurous acid (H2SO3):
1000/Tdp=3.9526-0.1863ln(PH2O)+0.000867ln(PSO2)-0.000913ln(PH2O)ln(PSO2)
Tdp is in degrees K, P is partial pressure in mm Hg. The error is claimed to be small.
1000/Tdp=3.9526-0.1863ln(PH2O)+0.000867ln(PSO2)-0.000913ln(PH2O)ln(PSO2)
Tdp is in degrees K, P is partial pressure in mm Hg. The error is claimed to be small.
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