Low pressure emergency flares

[JeromeBX]

Dear all,

I am working on a project of biogas plant. In normal situation, the biogas (compressed to 150 mm water gauge) will be used in boilers or flared. In case of failure of the gas compression unit, the biogas pressure will increase in the reactor, and when it exceeds 4 mm H2O, valves will open to allow gas release in emergency stacks. Due to high H2S content of the biogas and high risk of intoxication, I am not satisfied by this option and would like to know whether there are emergency flares working with gas pressure as low as 4 mm H2O?
For your information, the biogas production is about 6,000 Nm3/h, with 55% CH4, 38% CHO2, 3% H2S.

Thank you in advance for your help.

 

[mbeychok]

JeromeBX:

My best advice is that you contact the John Zink Company at

http://www.johnzink.com

Meanwhile, what is CHO2? Is that not a radical rather than a compound?



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

 

[JeromeBX]

Thank you for the advice.

CHO2 was a typing mistake, it should be CO2.

Best regards,

Jerome

 

[MortenA]

Isnt there another mistake:

It says that normal pressure is 150 mm H2O, but that the PSV opens at 4 mm?

Best regards

Morten

 

[Homayun]

What causes the pressure to rise in the ractor, when the compressor fails?

I would concentrate to stop the reaction in the ractor automatically when the compressor fails rather than installing a low pressure flare!

Or consider installing a second compressor..

 

[VikingUK]

I would be highly surprised if any gas with a 38% v/v concentration of carbon dioxide would burn under flaring. Even if you could get it to ignite there would be so much incombustible gas at the exhaust that it would be just as well to cold flare at a safe location (high up)
What is the other 4% volume made up of ?