3 replies to this topic

[vista]

are the acid gases (H2S and CO2) are flammable? what is the proper disposal method of these gases?

[breizh]

Vitsa

Take a look at the MSDS (material safety data sheet) ! you should get your answer .

http://www.airgas.co.../pdf/001029.pdf

Don't you know that CO2 is used in some extinguishers ?

Hope this helps.

Breizh

Edited by breizh, 24 August 2012 - 05:49 AM.

[vista]

Breizh
Yeah i do know that CO2 is used to extinguish the fire, I was confused about its mixture with H2S...we remove about 400 ppm H2S and 1.8 mol % of CO2...both of them goes to flare where we also add some sweet gas for ignition...my querry is about this whole mixture of acid gases...what will be the result if we do not add sweet gas?acid gases will be burned or not?although H2S is a flammable ....

[Art Montemayor]

Vista:

As Breizh has indicated, CO₂ is a well-known inert gas. It’s presence in your flare gas diminishes the flammability of the mixture. Instead of making “real-time” calculations on the flare gas to find out if it will burn on its own, what the flare designer and manufacturer has to do is to design for the eventual incineration of such gas mixtures.

That is why fuel gas (what you call “sweet” gas) has to fed to the flare and burned there. This fuel gas serves as the heat source for decomposing the flammable constituents in the flare gas. The H₂S should be oxidized to SO₃ if the combustion is complete. This is elementary chemistry. The CO₂ and nitrogen (in the combustion air) as well as excess oxygen will all be products of the combustion as well.

Your flare installation should have detailed engineering files and calculations – as well as an operating manual. You should have detailed calculations on the expected combustion that is to take place in the flare. Consult with that documentation. If it doesn’t exist, it should be generated and kept in the engineering files.