Know your alternative gasses
In my discussion of home producer gas appliances, Kevin Chisholm pointed out that I had misused some terminology in the interest of trying to add variety to my prose. (Such is a hazard in this business, and I have been called on it a few times before.) In the headline I used the term bio-gas to refer to the product from the wood gasification process. While this does describe what wood gas is since it comes from bio material, the term bio-gas (with or without the hyphen) is normally reserved for something more specific.
Bio-gas is better used to describe the product from digesters that is generated by sewage, rotting plant material, and cows. A more accurate description would be anaerobic digester gas (ADG) which is mostly methane. Sometimes the term bio-methane is also used.
The generators discussed in this case make wood gas, which is primarily a mixture of carbon monoxide and hydrogen. It also contains carbon dioxide, methane, various tars, nitrogen, and probably a few other trace substances. It’s basically the same thing you get taking a drag on a cigarette, which is why they’re so good for you.
Sometimes the term producer gas is used interchangeably with wood gas, although that may have a slightly more specific connotation. Coal gas, as the name suggests, uses a different feedstock and produces different proportions of components.
One term that has re-emerged in recent discussions is synthetic gas (syngas) which generally describes a purer mixture of hydrogen and carbon monoxide without the tars and other components. It is still usually produced by gasification of organic material but at a higher temperature and under more controlled conditions. This can be used as a feedstock for ethanol and synthetic gasoline processes.
The University of Arkansas agricultural folks have published an interesting discussion of gasification that goes into greater detail as to the processes involved. It has enough detail to get into issues like energy balance but without being too technical. For example, the wheat straw from one acre could replace 410 pounds of propane.
|Search the online Automation Integrator Guide|
Case Study Database
Get more exposure for your case study by uploading it to the Control Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.
These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.
Click here to visit the Case Study Database and upload your case study.