Combust sulphur containing organics vary percent oxygen & temperature

[vintage70]

Where can I find plots for the combustion of compounds such as dimethyl disulfide, methly mercaptan, dimethyl sulfide, hydrogen sulfide vs. percent oxygen and temperature. I am trying to determine HAP remove efficiency in flue gases using the excess oxygen and the temperature of the flue gas.

 

[mbeychok]

vontage70:

I don't fully understand what you are trying to do. I think that you are burning some material (like a petroleum-derived liquid) that contains dimethyl disulfide, methyl mercaptan, dimethyl sulfide, hydrogen sulfide ... and you want to determine how much of those compounds still remain in the combustion flue gas. In other words , how much of each of those compounds has been completely combusted to CO2, H2O and SO2.

I don't think that you can make that determination simply by knowing the temperature and the excess oxygen in the flue gas. What you need to do is:

(1) Get an analysis of the material being burned to determine the total sulfur content (in weight percent). Also, measure the mass flow rate of liquid being burned. Use those data to calculate the total weight of sulfur being fed into your combustion per minute (or per hour).

(2) Get an analysis of the combustion flue gas to determine the SO2 content (in weight percent). Also determine the volumetric flow rate and the specific gravity of the flow gas. Use those data to calculate the total weight of SO2 in the flue gas per minute (or per hour). The total weight of sulfur in the flue gas per minute (or per hour) will be one-half of the total weight of SO2.

(3) Then you will have the weight of feed sulfur per unit of time and the weight of flue gas sulfur combusted per unit of time. That will tell you what percentage of your feed sulfur was completely combusted.

Milton Beychok
(Contact me at www.air-dispersion.com)
.

 

[vintage70]

Thanks for the reply. I don't think you answered the question. We know the flow rate, composition, and all the other stoichiometric details that you presented.

Question again:

What are the Arrenhius Rates for the combustion of these constituents? From this we can construct destruction efficiency curves that include temperature vs. residence time.

Note that we are not interested in checking to see if a particular arrangement meets some guidelines or minimum criteria (say 1600F for > 0.75 seconds as some regulations stipulate as "necessary")

Combustion kinetics for pure hydrocarbon fuels have been measured and are reasonably well known.

The rates for these sulfur-bearing compounds is needed.

 

[mbeychok]

vintage70:

There was no mention of Arrenhius rates in your original posting. Now that you have more fully explained what you are looking for and why, perhaps you will get better answers.

Milton Beychok

 

[vintage70]

I did explain that I was looking for plots for the combustion of those compounds. Plots of concentration verses time, oxygen percent, temperature. These plots are determined using the Arrenhius Rates. Since you were way off base with your first reply I felt compelled to elaborate.

Thanks for the second reply. I plan to check out your website.