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Archive for July, 2009

How it Will Benefit Us All: Gasification

If you search for gasification and terms like “wood stove” on video sharing sites these days you will see demonstrations of wood being burnt in little stoves which seem to something almost miraculous and quite different from our idea of wood as a fuel. These little boilers light rapidly, produce no detectable smoke after the initial lighting and firing, and burn very hot.

So what is the technique which is being used, and how might it help us all in weaning society off fossil fuels?

What you have seen is a method of gasification. It differs from combustion in that it uses just 20% to 30% of the air or oxygen necessary for complete fuel combustion. During gasification, the amount of air supplied to the gasifier is carefully controlled with the effect that only a small part of the fuel burns completely. Trials of this process have illustrated that up to 70% of the energy value of the fue used can be recovered as what is known as synthesis gas, or syngas. This producer gas can also be used for various applications similar to natural gas.

This is a part of the magic, and not one really shown in the YouTube type videos, but it makes this method even more useful. This is due to the fact that syngas can be put to useful work, in both drying the feed fuel prior to gasification and after collection and storage it can be used as a fossil fuel replacement, and renewable energy source. When a gasification plant also includes Combined Heat and Power (CHP) and/or electricity export from the site, the gains are even more impressive.

Gasification in addition promises to be the most efficient long-term solution for capturing carbon while utilizing these valuable feedstocks, and storing the CO2 for very long priods, to reduce or halt global warming.

Gasification of wood and wood-type residues and waste in fixed bed or fluidised bed gasifiers with subsequent burning of the gas for heat production is has become state of the art with designers of thes systems working hard to gain the absolute maximum efficiency out of these systems.

These wood gasifiers which are located primarily in the Scandinavian countries are used almost entirely for space heating heat generation. Gasification of biomass is the renewable fuel system preferred by many, and can be defined as the thermal conversion of solid biomass to gaseous fuel.

Gasification has been around for over a hundred years, but the benefits of biochar are only now being discovered. Furthermore, it is still a wide-open field.

Before electric lighting was available in cities there were street lamps fuelled by gasified coal. It is easy to forget that the process has been reliably used on a commercial scale worldwide for more than 50 years in the refining, fertilizer, and chemical industries, and for more than 35 years in the electric power industry. More than 75 companies involved in the development, licensing, and use of these technologies as well as engineering, construction, equipment manufacturing and production of synthesis gas by gasification from coal, petroleum coke, heavy oils and other hydrocarbons.

Gasification has been proven to be a viable technology for CO2 capture and reducing SOx, NOx, particulate matter, and mercury emissions from coal and petcoke-fired power plants, synthetic fuels production, and chemical facilities.

Plants in this category have been capturing carbon dioxide for several decades in chemical plants in China and the United States. It also has potential contributions to make to both transportation and electrical power energy markets. With ongoing concerns about the price and availability of oil, populous countries like the U.S. gasification has proven to be in high demand and quite successful. However, it can also be used in conjunction with gas engines and gas turbines to obtain a higher conversion efficiency than conventional fossil-fuel electric power generation. Gasification can help meet renewable energy targets, address concerns about global warming, and contribute to meeting global environmental targets.

Steve has built a great web site where there is a lot more information about gasification. This is a hot subject indeed for this technology which has become an essential read for all those in alternative energy and interested in taking action to reduce the impact of climate change.

Electric car's Technology

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Can You Be Green,Legal , and Clean?

You may have seen something on the news about Spokane, Washington where there is now a ban on dishwasher detergent made with phosphates. While this may seem to be an isolated case, there are actually several states (including the rest of the state of Washington) that will make dishwashing soap made with phosphates above a very small level illegal in 2010.

What is phosphate anyway and why is it used in dish washing soap?  Phosphate is an inorganic chemical that is a combination of salt and phosphoric acid.  Because it can clean things like hard water stains, and grease, phosphates are used in all kinds of things including dish washing soap. 

Why all the fuss?  Phosphate is a problem when it finds its way to freshwater rivers and lakes.  The phosphate encouraged the growth of algae which depletes the oxygen in these rivers and lakes, killing off fish and other wildlife. 

While there are green alternatives out there, deleting the phosphates from the dish washing soap can leave one unsatisfied with the resulting product-and a lot of dirty dishes.  Plus some of these green alternatives are pricier than their cheaper phosphorous counterparts.  This has caused people to travel outside their state to obtain contraband detergent from other states-which, of course, defeats the purpose of the bank in the first place. 

What should you look for in a green dish washing soap?  Are there green products that work as well?  While there is no direct substitute for phosphorous, but there are other substances that can be used.  How well they will work depends on a number of factors, perhaps the most important being the hardness of the water used for cleaning.

One ingredient that be used is a surfactants.  Surfactants are usually biodegradable and are used to provide cleaning power and increase the ability of the water to separate the soil from the dish. Anionic surfactants work well as detergents, but can be less than effective in hard water. Amphoteric surfactants are used for their foaming power and can often be found with anionic surfactants. There are other substitutes for phosphates, but these can be even more dangerous than the phosphates. They include nitrilotriacatic acid (NTA) and caustic alkaline chemicals (which are particularly dangerous when ingested-as sometimes happens with children).

It may take some trial and error to come up with the phosphate substitute that works best in your water.  It is unlikely that the ban on phosphates is going away, so it is better to start exploring the options now.  In the meantime, the soap manufacturers continue work on the perfect phosphate substitute, but there are some excellent alternatives out there.

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Noise and Vibration Control Goes to the Animals

Noise and vibration control is an issue that is much more common than one might originally think. In fact, it can creep up in the most unlikely of places. A good case in point is animal lab environments. Indeed, ALN Magazine recently ran an article titled “Noise & Vibration Considerations for the Animal Lab Environment.” Therein, the publication pointed out, “In the lab animal facility setting, noise, sound, and vibration affect the life cycle, interaction, and behavior of animals.” However, because “the impact of noise, sound, and vibration is a largely undocumented factor in the research,” it’s an often overlooked issue.

“If the sound pressure levels get too high,” the article continues, “there is a negative impact on animals and structures.” Vibration control, however, is just as important to these animals as noise control in that it “is a driving force behind radiated sound.”

Obviously, exposure to noise and vibration can be detrimental to an animal’s hearing, but the risks don’t stop there. “Sound and vibration can [also] have a physical impact on animals.” Even more startling, “Smaller animals are more susceptible to the affects of sound and vibration over time and will adapt or adjust accordingly. In some cases, mutations may result from exposure to undesirable conditions.”

How can animal laboratories mitigate these problems? The magazine notes, “The designers can control items that are constant disturbances that may greatly impact the animal community. Items within the designer’s control include ventilation system design, machinery vibration isolation, wall construction, lighting selection, and computer terminal placement.”

During the design process, animal labs may want to consult with a producer of custom-molded rubber and rubber-to-metal bonded parts for noise and vibration control. A world leader in the creation of rubber molding and rubber-to-metal bonded parts can help to create an environment that is not only safe for the animals being kept there but is also conducive to a healthy work environment for the people who are employed there.

The Vibro-Insulator line of isolators and mounts, in particular, aid in the control of noise, vibration, and shock. Selecting the right type of mount for an individual animal lab’s specific applications can prove tricky, however. That’s why consultation with an expert with reputable qualifications in rubber molding and rubber-to-metal bonding can be very beneficial.

Of course, once professional advice has been obtained, browsing the Vibro-Insulator catalog allows animal labs easy navigation so they can select the correct mount for their application. Rubber Vibro-Insulators come in a variety of styles and sizes to handle most vibration isolation problems. Most of the mount styles are designed to be used in either the compression or shear direction.
Selection of the proper Vibro-Insulator for a specific application boils down to a multi-step mathematical function that an expert can calculate for the lab or into which the lab’s design team can plug the following information:

1. The maximum load that must be supported.
2. The number of mounts supporting the load.
3. The frequency of the disturbing vibration.
4. Any restrictions on the size or style of the mount based on space limitations or assembly considerations.

Carmen Fontana is a Web Services Manager for Western Reserve Internet Services. Karman Rubber is a world leader in vibration control.

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Cleanliness Analysis

You cannot control that which you do not measure.

In more and more industries, the exact knowledge of particle contamination is gaining in importance. Contamination of materials in dimensions of a few micrometers was mainly of concern for the pharmaceutical and semiconductor industries. However, not only manufacturers of circuit board components, but also traditional car parts suppliers face new demands on particle recognition and contamination source identification.

Cleanliness for the automotive parts manufacturers has become a huge topic in today’s ever challenging continuous improvement world. The need to define, measure and control the levels of particulate contamination on product is the new norm for suppliers and automotive OEM’s.

Cleanliness directly relates to product warranties, reliability, performance and safety issues. It has long been known that a dirty product gives us poor quality and low life expectancy. The dirtier the transmission from new, the less time it will last.

It is crucial now to identify particles and their source so that effective elimination can be achieved. Residual contamination consists of particles that persist on the component’s surface after the final step in manufacturing. Such contaminants are introduced via parts from suppliers or arise during processing. After vehicle assembly, the contaminant particles can cause severe damage, loss of function or reduce the lifetime of the product.

Cleanliness is defined as the contamination level of a component surface. Common measures to quantify the cleanliness are mass of the contaminants as well as number, size of the dirt particles. In general, the customer will specify contamination limits. The supplier then has to maintain these levels and document them regularly by means of contamination analysis.

The analysis of the contamination has to be proven to not affect the result and to be effective in evaluating all the contamination present. Methods of extraction and evaluation are specified in the international standard ISO 16232. Particular attention must be paid to the extraction method to ensure no contributing factors are introduced to the evaluation. There are different methods of counting the resulting extracted particles but by far the most accurate, repeatable and cost effective is automated microscope analysis. The microscope with software can scan the filter membrane; sort the particles by size class and even determine basic material composition (metal, non-metal, fiber). Once the data is gathered a custom report can be generated based on the customer requirements.

For more information on cleanliness analysis, visit http://www.onclean.com

Chris Trower is the President of Onclean Labs Inc, an Ontario based lab specializing in third party cleanliness analysis testing.

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