Economic Options for H2S Removal - Biogas Plant
Economic Options for H2S Removal - Biogas Plant
(OP)
I'm looking into options for scrubbing H2S from biogas and trying to determine which is the most economically sound (both capex and opex). The gas may have concentrations up to 5,000ppm H2S and a large volume (up to 150,000m3/week). Need to scrub it down to around 600ppm. What would be the best technology for this?





RE: Economic Options for H2S Removal - Biogas Plant
a) Peak hourly rate?
b) Min / max operating pressure / temp at the absorber ?
c) Any other sulphur bearing contaminants - COS, CS2?
d) Since this is biogas, almost all of this would be methane and saturation water vapor, and no CO2?
Given you dont need high removal eff, possible options would be, at either end of the spectrum :a physical sorbent like Selexol (Dow / UOP); chemical sorbent - the more popular activated MDEA / piperazine blends - many licensors for this.
The physical sorbent schemes are simpler and more stable (flash regen might do), and may save you on CAPEX for materials of construction also, while the chemical sorbents may enable lower sorbent circ rates, but you may need better materials of construction if you want to minimise corrosion related operating issues later.
RE: Economic Options for H2S Removal - Biogas Plant
Great disadvantage of physical solvents is their affinity towards Hydrocarbons and the need for higher operating pressures, which leaves you with chemical (Amine) solvents: MDEA, DEA, etc. I see you are based in Australia so perhaps you can shoot an inquiry directly to Huntsman Co. or to Worley Parsons so you can obtain the EPC quotation/proposal.
http://www.huntsman.com/performance_products/Media...
http://www.worleyparsons.com/Contact/Pages/OfficeL...
Dejan IVANOVIC
Process Engineer, MSChE
RE: Economic Options for H2S Removal - Biogas Plant
http://www.merichem.com/gas/upstream/natural-gas/l...
RE: Economic Options for H2S Removal - Biogas Plant
RE: Economic Options for H2S Removal - Biogas Plant
http://www.eco-tec.com///pdf/brochures/gPur%20Broc...
http://cdn.intechopen.com/pdfs/22869/InTech-Remova...
http://www.eco-tec.com///pdf/TP%20-%20186%20Biogas...
Dejan IVANOVIC
Process Engineer, MSChE
RE: Economic Options for H2S Removal - Biogas Plant
RE: Economic Options for H2S Removal - Biogas Plant
N-methyl pyrrolidone - Lurgi license
Morphiline based derivative - Uhde license
Obviously, you'll need a game plan for what you'll do with this H2S stream from the regen unit flash drum and / or stripper - that may have some bearing on a favourable process scheme.
RE: Economic Options for H2S Removal - Biogas Plant
RE: Economic Options for H2S Removal - Biogas Plant
I think that the OP should consider that a lot of the H2S solutions are geared towards much higher throughputs at much higher pressure (and generally better economy) than what is the case for biogas in general. 150,000 m3/week biogas may be a lot for biogas, but its a tiny gas field. I would still look at the LO-CAT solution