5 replies to this topic

[swati]

I am working as process engineer in Indian Oil Corporation LTD. India and monitoring after SRU block.

I have to calculate the dew point of flue gas coming out from incinerator to the stack to maintain proper stack temperature..But i am not getting any proper formula to calculate it.If I am going to use Antonie's equation but not getting Antonie's constant for SO2 or NOx. Some body kindly help me out with proper formula as early as possible. I am badly need your help.

The flue gas composition is as follows :

SO2 - 18.5 ppm
NOx - 34.1ppm
CO- 7.4 ppm
Hydro carbon - 17.3 ppm
moisture content - 6.4 %

[Zauberberg]

See attached article, and the graph provided on the 1st page: it correlates SO2 content, water partial pressure, and the flue gas dew point. You are somewhere around 140 degC, which is a quite common figure.

You may Google around for the subjects "cold end corrosion" or "stack gas (acid) dew point" and you'll find a lot of similar charts.

Attached Files

•  Cold-End.pdf   112.15KB   293 downloads

[ankur2061]

Swati,

A flue gas dew point excel calculator is available at the following link:

http://www.ntes.co.k.... dew point.xls

Additionally also have a look at the following post:

http://www.cheresour...h__1#entry20756

These should help.

Regards,
Ankur.

[swati]

Thank you for your kind reply.
But sir I want an empirical formula not a calculator.please help me.

[ankur2061]

Swati,

Did you take the trouble of having a look at the second link in my post. It provides the empirical equations given by two different researchers A. G. Okkes and Verhoff & Banchero for flue gas dew point (basically sulfuric acid dew point ). The acid dew point is the one which is of concern for any kind of stack since flue gas temperature at or below the acid dew point contributes to the acid corrosion of the stack.

Regards,
Ankur,

[shujaat]

The only solution is to determine it in the laboratory.

I am working as process engineer in Indian Oil Corporation LTD. India and monitoring after SRU block.

I have to calculate the dew point of flue gas coming out from incinerator to the stack to maintain proper stack temperature..But i am not getting any proper formula to calculate it.If I am going to use Antonie's equation but not getting Antonie's constant for SO2 or NOx. Some body kindly help me out with proper formula as early as possible. I am badly need your help.

The flue gas composition is as follows :

SO2 - 18.5 ppm
NOx - 34.1ppm
CO- 7.4 ppm
Hydro carbon - 17.3 ppm
moisture content - 6.4 %