How to Purify Methane from Biomass for Clean Burning?

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Discussion Overview

The discussion revolves around methods for purifying methane produced from biomass, focusing on the removal of impurities such as carbon dioxide, water vapor, and hydrogen sulfide to achieve a cleaner burning fuel suitable for use in a turbine engine. The conversation includes practical concerns about the effects of these impurities on engine performance and longevity.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about easy methods to purify methane from biomass, noting the presence of other gases like CO2 and potential hydrogen sulfide.
  • Another participant suggests that the gas can be burned as is, but warns that the heating value may be lower due to inert components and that burning hydrogen sulfide could produce dirty exhaust.
  • A participant expresses concern about the potential damage to turbine engine rotor blades from water and hydrogen sulfide, indicating a need for purification.
  • One reply highlights the toxicity of hydrogen sulfide and proposes methods for gas purification, such as bubbling through alkaline solutions and using a silica bed drier, while questioning the necessity of such efforts for short-term use.
  • The original poster emphasizes the importance of cleaning the gas to protect their turbine engine prototype and achieve clean combustion.

Areas of Agreement / Disagreement

Participants exhibit a mix of agreement and disagreement; while some acknowledge the possibility of burning the gas without purification, others express concerns about the long-term effects of impurities on engine components. The necessity and methods of purification remain contested.

Contextual Notes

Participants mention various assumptions regarding the levels of impurities and their potential impacts on engine performance, but these assumptions are not fully explored or quantified. The discussion does not resolve the effectiveness of proposed purification methods.

Who May Find This Useful

This discussion may be useful for individuals interested in biomass energy conversion, gas purification techniques, and the practical applications of methane as a fuel in engine design.

iwant2beoz
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Hello does anyone know an easy way to purify methane made from biomass? I am not sure what gases I am producing but i know i have methane, CO2 and water vapor, and maybe hydrogen sulfured judging from the smell. I want to get a product clean enough to burn in place of nature gas. Thanks for the help
 
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You can probably burn your gas as is, even though it has a lot of other stuff with it.
The heating value would be lower, because of the inert components and the exhaust would be a bit dirty, from the burning hydrogen sulfide.
Just check to make sure your methane percentage is high enough to avoid the chance of explosion.
 
I know that it will burn, i tested that. But i worry that the water and hydrogen sulfured could damage the rotter blades in the engine I am working on.
 
Hydrogen sulfide stinks so bad the human nose picks it up at the part per million level, which is good, because it is actually more poisonous than hydrogen cyanide.
You can spend the effort to clean up your gas, bubble it through alkaline solution to strip the CO2 and maybe copper nitrate for the H2S and then a silica bed drier, but why bother? Unless you plan to run your engine for a long time, nothing biologically sourced will do much damage. We're not looking at 10% H2S levels here, as could be the case with raw well gas
 
My goal is to build a turbine engine that runs on methane, but i worry that over time the blades will get pitted and brake and i don't want to ruin months of work and wast all the money I am putting into this prototype. And i also want it to burn cleanly. So i will try cleaning the gas before i use it. Thank you:)
 

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