from PPM to mg/dNm3

[Roman Katz]

Here are the exact values:

Gas temp, 150 deg C
humidity 30-45%
SO2: 2000PPM
O2 during measurements: 10.7%

What would the calculation be?

[Roman Katz]

Here are the measured values:

Pressured drop: 75 mm/WC
Flue gas temp: 150 deg C
gas humidity 30%
O2-10% during measurement.
SO2: 2000PPM

What would the calculation be?

[Mrs X]

For numerous reasons, i don't think you should be involved in this. Seriously. That is THE best advise anyone can give you.

[Roman Katz]

What do you mean?

[Mrs X]

I'm not sure if this is a real situation, or how you are involved, or how much exhaust is involved. (These are usually processes from large production plants such as refineries or smelters though). If this is a real situation, you could consider employing a consultant who can help you with the clean-up, if that is what you are requiring.

I can only go by what you have written here, and may be reading it completely wrong. However, from what i read, you have completely missed the danger of the situation, both for personnel and the environment, even though it has been pointed out. - Large amounts of SO₂ - which is highly toxic, and is one of the main contributors to acid rain. You don't appreciate the constraints of the system, also pointed out - potentially lots of sulphuric acid produced - which changes the calculations hugely, is highly corrosive, and has caused many industrial accidents and deaths.

Most countries have rigorous standards to avoid environmental contamination form these systems. Having someone who understands these standards is imperative.

What comes across from what you have said or not said is that you don't have the background, training, or thought processes to take heed of the ethical and scientific considerations, therefore i do not think you should be further involved in this work.

[Roman Katz]

Dear X,

This is my job for the last 5 years. I appreciate your concern for my well being. I believe that I know what I am dealing with.

I would like to receive the calclulation, please.

[JohnS]

Originally Posted by Roman Katz

Here are the measured values:

Pressured drop: 75 mm/WC
Flue gas temp: 150 deg C
gas humidity 30%
O2-10% during measurement.
SO2: 2000PPM

What would the calculation be?

I can't do the calculation because I have numerous questions about what your terms mean.

1) What is a dNm³? Is the "d" dry, deci, or something else? Is the "N" normal, and if so, specifically, is it 101.325 kPa, 0°C or something else?

2) Absolute pressure is needed. What is the station barometric pressure (not corrected to sea level)? If you don't know station pressure, do you at least know elevation above sea level (and hopefully altimeter setting at your local airport)? The water column pressure is gage, +/- to local atmospheric pressure. You describe it as pressure drop, but is it positive or negative water column relative to atmospheric? I would expect it to be positive or exhaust won't flow out the flue.

3) What does 30% humidity mean? Is the flue gas 30% water vapor by volume (or molar ratio) or something else? I don't see how that is possible given the percentage excess air, even if you are burning pure H2. (Burning pure H2 gives about 34.3% water vapor at stoichiometry, 17.3% water vapor at 100% excess air, any hydrocarbon fuel gives less due to CO2)

4) 10% O2: How does this impact any required calculation? Normal air is about 21% O2, so this suggests roughly 100% excess air. Do you have to calculate your SO2 emission vs combustion air (at stoichiometry) or total air?

5) Is this for compliance? If so, there is probably a legally required methodology, and you need to find it. If not, what exactly do you want to know? How will the data be used?

[JohnS]

I found two references that may work as tutorials for you on these calculations. They both deal with:
*Flue gas on wet/dry basis
*Actual excess air, reference excess air and stoichiometric (required) air
which are the two main issues your question focuses on.

The references:
http://www.rbbertomeu.es/htmlish/doc...0dieseloil.pdf
http://www.qlimited.com/pdf/Land-Com...versions-Q.pdf

Module 2: Characteristics of Gases - Concentrations
Check this out on USEPA.