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Bell Functionality Fuel Problems Sequence: Biodiesel Primer – The Great Plus The

Bell Performance Fuel Troubles Sequence: Biodiesel Primer – The good And the BadEXECUTIVE SUMMARYBiodiesel (fats converted into fuel) has become a significant player inside the fuels market, with creation and use growing exponentially since the mid-to-late 2000s. Biodiesel blends offer you environmental and operational added benefits for shoppers, including greater cetane and lubricity, and decrease emissions. Biodiesel’s greatest disadvantages are storage instability and gelling in cold weather conditions, which may fluctuate significantly based on the type of oil from which the biodiesel was made.Precisely what is BIODIESEL?”Biodiesel” is often a body fat which has been chemical altered through a sequence of reactions, leading to a chemical that could be burned in the diesel engine as fuel in put of regular #2 diesel fuel.Contrary for the terms which are thrown all-around from the marketplace and on World wide web message boards, the term “biodiesel” refers only to the actual “FAME” chemical that success from the chemical conversion of fat into fuel. The legal definition of biodiesel is “a prolonged chain fatty acid ester made up of just one alcohol molecule on an individual ester linkage”. The acronym “FAME” stands for “fully alkylated methyl ester”.Now some individuals chat about putting straight raw vegetable oil or animal unwanted fat within their motor vehicle, referring to this apply as burning biodiesel fuel. However, raw vegetable oil chemically contains a few ester linkages (rather than only one) and therefore is just not legally defined as biodiesel. Raw vegetable has a distinctive viscosity than biodiesel or diesel fuel (approximately 10x a lot more), and burning it within a diesel engine leads to massive time engine deposits, ring sticking and lube oil dilution. This is genuine even when you simply extend out your fuel by including as very little as 10% raw oil. The chemical conversion that turns raw vegetable oil into biodiesel FAME reduces its viscosity to that of diesel fuel, enabling it to melt away like diesel does within the engine. Placing directly unconverted vegetable oil into your motor vehicle or boat can be a recipe for engine challenges and disaster, it does not matter what these folks say.The sole phrase “biodiesel” always refers to your 100% FAME solution. Pure biodiesel can be known as B100 (100% biodiesel). When biodiesel is combined with diesel fuel, you obtain a “biodiesel blend” that may be designated as “Bxx”, relating towards the proportion of biodiesel inside the overall mix. B2, B5, B11 and B20 would be the hottest and generally found blends. Blends above 20% are less normally discovered because engine companies don’t warrant their engines to run on blends previously mentioned 20% biodiesel. When you follow B5 and that fuel is in specification, it really is illegal for an engine producer not to honor the guarantee. B2 and B5 are incredibly usually discovered in states which have a biodiesel mandate, these as Minnesota and Louisiana. Minnesota was the primary state within the Union to mandate state-wide blending of biodiesel into all of their diesel fuel, starting in 2005.How can you MAKE BIODIESEL?The essential recipe for biodiesel is:100 units plant/animal oil + twenty units alcohol + catalyst ƒ 100 units of FAME feed stock + 10 units of recovered alcohol + 10 units crude glycerin.Another way to produce biodiesel is to take a hundred lbs fat + 10 lbs short-chain alcohol (like methanol) + a catalyst (sodium or potassium hydroxide) to get 100 lbs of biodiesel (about 13.5 gallons) and ten lbs of glycerin.These processes speak to why biodiesel manufacturing is relatively common – the ingredients are cheap and easy to find as well as reaction processes are simple. The catalyst for the reaction is sodium hydroxide, as well as short-chain alcohol most generally used is methanol, both cheap and easy to find. The downside to all of this is it is actually also easy for the small-time “backyard” biodiesel producer to produce biodiesel that of “out-of-spec” if they are not careful in their processes. The consumer can avoid these troubles by only buying their biodiesel mix fuel from reputable suppliers.Rewards OF BIODIESEL USEBiodiesel blends give some great gains for individuals:1. Higher cetaneB100 incorporates a higher cetane number than most typical diesel fuels; high cetane rating means easier beginning for diesel engines and is comparable for the octane rating of gasoline. The cetane increase varies by the type of feed stock used to manufacture the biodiesel. Highly saturated fuels built from animal fats (like leftover frying animal grease) can have higher cetane ratings as high as 70; polyunsaturated feed stocks (together with soy and rape seed) are lower, closer to a 47 cetane rating. Of course, this cetane increase is blunted by the proportion of the biodiesel mixed into the blend – a B5 only has 5% biodiesel in it, so the cetane increase is only 5% of what it would have been at B100.two. Low Sulfur ContentBiodiesel is naturally low sulfur, which makes it easy to incorporate into a fuel system without running afoul of the stringent ultra low sulfur diesel regulations, where sulfur content is capped at a mere 15 parts per million.3. Superior LubricityMixing biodiesel into ultra-low sulfur diesel solves a single of ultra-low sulfur (ULSD) diesel’s biggest difficulties – its lack of lubricity. Removing the sulfur from diesel fuel destroys many of the substances within the fuel which enable it to lubricate engine parts like injectors and fuel pumps. But including as tiny as 2% biodiesel to a fuel blend gives 66% a lot more lubricity to #2 diesel than before.Having said that this lubricity increase is just not a linear one, as the curve of added lubricity benefit to percent biodiesel levels off as the composition approaches just two.5%. So there is no additional benefit of added lubricity when comparing a B5 or a B20 to just a B2 blend.Still, 66% additional lubricity is a wonderful benefit to have.4. Cleaner EmissionsThis is the biggest reason why cities and government entities have recently started to include much more biodiesel within the fuel supplies for their municipal and transit fleets..Most large urban areas already fail EPA air standard qualities, placing them at risk of government action which could force them to adopt measures to improve air qualities or else lose federal monies. Taking action like switching to biodiesel blends can help meet these standards, and can be a fantastic PR move, making the local government appear to be extra concerned about green issues.What emissions benefit does biodiesel use give? Based on the blend proportion, biodiesel combustion final results in reduce emissions for most measured emissions related to hydrocarbon combustion. Unburned hydrocarbons and particulate emissions (the nasty black smoke you can see coming from the stacks of diesel big rigs) drops as much as 47-67% over directly diesel fuel alone.Biodiesel emissions have reduce levels of polycyclic aromatic hydrocarbons (PACs) and other harmful carbon ring compounds than regular diesel fuel. A B20 mix will reduce those harmful compounds by 20-40%. This is a great thing mainly because PACs have been linked to causing cancer.NOx emissions are also targeted by the EPA simply because NOx contributes to ozone manufacturing and poor air quality in urban areas (ozone inside the sky is good; ozone around the ground hurts your lungs). Biodiesel has a neutral to slightly negative effect on NOx emissions; nevertheless, these figures are in dispute by some groups like the National Biodiesel Board and so research is still ongoing.The story is distinct when you go from a truck or boat to burning biodiesel in a home heating boiler system. NOx does decrease when biodiesel is burned in boilers/home heating oil, due to burner differences. When blended into heating oil, NOx emissions are reduced by 1% for each 1% biodiesel blend added. This reduction happens no matter what kind of feed stock used to make it..Issues AND Disadvantages WTH BIODIESEL USEBiodiesel’s environmental benefits are blunted by its fuel-related difficulties.1. Significantly less BTU energy value than Diesel = Significantly less MileageRelative to weight, the biodiesel FAME molecule is made up of much less energy than a diesel hydrocarbon chain molecule. Much less energy and reduced heat of combustion outcomes in decrease mileage.How much this drop is depends on who you ask and sometimes can be overstated. B100 has 8.5% much less energy per gallon than diesel fuel. The biggest part of the energy difference is due for the FAME that contains 12% greater oxygen – extra oxygen as opposed to carbon. When you factor in differences in density, this energy difference is reduced to 8.5%, apples to apples.Typical energy values for the two fuels are 118,170 BTU for B100 vs 129,050 BTU for #2 diesel. Nonetheless, at lower blending ratios like B20, the drop just isn’t noticeable by most drivers, due to the fact 80% of the blend is now diesel fuel. So when using B20 or B5, you’ll get some mileage drop, but it’s not going to be around the order of ten or 20% like some claim.two. Cold Flow problemsThe cold flow properties of biodiesel blends are highly dependent on the feed stock from which the biodiesel was produced. The level of saturation is the biggest factor here. Highly saturated feed stocks (palm oil, coconut oil, animal fats) have the worst cold flow properties but would be the most stable. The opposite is true for polyunsaturated feed stocks (rape seed, corn, canola oil) – they gel less in cold weather but are the most unstable.A typical B20 blend includes a gel point 3-10 degrees F higher than regular diesel. The cloud point for most B100 starts at 30-32 deg F for mono- and poly-unsaturated feed stocks (most vegetable oils) but may be approximately 80 deg F for animal fats and highly saturated frying oils. When the fuel hits the cloud point, it gets hazy and will start the chain-reaction processes for gelling.Also problematic is that the biodiesel pour point is only a few degrees decrease than the cloud point. So when the fuel starts clouding up, it’s going to gel up and turn into thick only a few degees below that. For example, soy FAME (pure B100) includes a cloud point of 38 degrees F, CFPP of 28 and a pour point of 25 F. Other differences between cloud point and pour point are usually 8-10 degrees F total – not incredibly much.If feasible, gelled biodiesel could be restored by heating the fuel to dissolve the precipitated crystals. To get crystals back into solution, the fuel needs to be warmed back as much as 100-110 deg F to melt by far the most highly saturated crystals back into solution. Nevertheless this does not help you when you are stuck inside the middle of nowhere with a tank full of gelled biodiesel.3. Materials CompatibilityThis is really only a problem in older engines which use older materials like nitrile rubber, polypropylene, polyvinyl, or Tygon. The same is genuine for older fuel storage systems. The average consumer with a much more contemporary auto doesn’t need to worry too much about it.For systems that contains these materials, they are all susceptible to attack from B100, which may damage these materials used in hoses and pump seals.4. Elevated NOx EmissionsAs mentioned before, biodiesel can increase NOx creation in internal combustion engines, which is bad for urban air quality. Just how much this increase is can change by feed stock; the difference in NOx emissions between high and low NOx feed stocks is about 15%.The composition of biodiesel determines how much NOx is produced. Much more highly unsaturated feed stocks produce higher NOx levels. Vegetable oil feed stocks would be the most unsaturated and animals fats or tropical oils will be the least, so you would expect vegetable FAMEs like soy and canola to products the worst results on NOx emissions.Why is this?Some past research has indicated that the increased NOx production is related to differences in injection rates into the combustion chamber caused by biodiesel’s higher “bulk modulus” (resistance to compression) and higher viscosity, which makes it much less compressible than regular diesel. Much more technically, the higher bulk modulus and higher speed of sounds of biodiesel means the pressure rises faster inside fuel lines and develops an advance of nearly two degrees in injection timing within the engine. This in turn generates a faster pressure and temperature rise while in the combustion chamber, leading to an increase in NOx.It can be apparent the best way to reduce NOx is by modification of engine technology. Retarding the engine timing by 1-5 degrees can bring B100 NOx down to diesel baselines or below. Unfortunately, the tradeoff for doing this is a reduction in power for the driver.5. Effects on engine lubricationBiodiesel use seems to possess a negative effect around the engine lubrication. As proof, European engine suppliers prescribe a 50-70% reduction in oil drain intervals with the use of blends above B5. A practical reason for this might be that biodiesel’s higher density and surface tension prospects to extra fuel dilution of the lubrication within the crankcase.So if you use biodiesel and make a lot of short trips or drive in harsh or extreme conditions, it may be best to be much more careful in how often you change your oil. Most suppliers recommend every 5,000 to 7,000 miles on regular fuel. Using biodiesel could mean you need to err on the reduce end of that scale.s6. Cleaning EffectsThe methyl esters in biodiesel have been used as low VOC (environmentally-friendly) cleaners for many year; they are excellent detergents. This is certainly not normally a very good thing when you introduce them into a dirty storage or truck/boat fuel tank.When initially added to a fuel system, B100 dissolves any sediments present inside fuel filter and fuel storage tank and can cause fuel filter clogging and bursting, leading to injector deposits.It really is recommended to clean tanks and fuel systems before to begin with introduction of B100 to a system. Luckily, B20 is too dilute to possess a similar cleaning effect. So the average consumer may not have to worry about this too much.7. Stability IssuesThe typical shelf life for B100 designed from soy or canola oil is about four to six months in ideal conditions. Ultimately, the working storage life of biodiesel (like diesel) is dependent upon the storage conditions.For biodiesel, cold flow properties and stability seem to be corollaries – biodiesel with excellent cold flow response have poor stability and vice-versa. Biodiesel is susceptible to oxidation from exposure to air, water, light and certain metals. When it undergoes these reactions, it 1st becomes hazy, and then forms a thick precipitate gel. Analysis of this gel shows that it really is mostly produced up of organic compounds that happen to be directly produced by the “oxidative cleavage” of double-bonds inside biodiesel molecule. In other words, oxygen-containing compounds (such as water) will chemically attack biodiesel and break it apart, producing a mixture of components that combine to produce biodiesel gel and sediment.What causes biodiesel breakdown?What kind of compounds can contribute to biodiesel instability and breakdown? Contact with air provides the oxygen necessary to fuel oxidation reactions that break the fuel down. Contact with water causes the biodiesel to hydrolyze and form organic acids, which are partly responsible for the compatibility troubles with various rubbers. Contact with metals like tin and copper will degrade biodiesel and create sediments.Now an individual might think that these instability effects are lessened when you simply dilute biodiesel inside a B20 or a lot less blend. But it truly is interesting to note that B100 does not produce sediments at the same rate that biodiesel blends like B5 and B20 will. This can be because B100′s higher viscosity and greater concentration of chemical bonds act to disperse and suspend these oxidative compounds, preventing them from working together to accelerate the chain reactions that lead to sediment formation. So, as a general rule, B100 is extra stable than B20 and other biodiesel blends.When discussing biodiesel fuel stability, it’s common to hear terms like Thermal Stability and Oxidative Stability. Thermal Stability refers towards the fuel’s ability to resist breakdown when exposed to heat for periods of time. B100 FAMEs tend to have superior thermal stability features, due on the feed stock use in common cooking applications. If thermal breakdown did occur, injector coking would be by far the most likely engine problem associated with the poor-quality fuel.Oxidative Stability is the fuel’s ability to resist oxidation when exposed to factors like air, water, and certain metals. This is the biggest weakness of biodiesel. A single reason for susceptibility to oxidation is that the processing of some of the feed stocks can remove natural antioxidants from your compound. Additional highly saturated feed stock seems to be more resistant to this and have better oxidative stability.Occurrences of biodiesel oxidation are even higher in erratically-used engines, this sort of as generators and seasonal vehicles. Biodiesel blends that are stored for long periods of time accumulate water and are exposed to air and heat for lengthy periods of time, and have the greatest chance of developing microbial contamination, which may produce further acids that accelerate fuel breakdown.Why is this bad for engines?Biodiesel which has been oxidized in this manner does not melt away anywhere near as well as fresh biodiesel. Running this kind of fuel as a result of the engine gives poor combustion, leading to a drop in mileage. Since it does not combust cleanly, it will form deposits from the injections and in the combustion chamber, and this poor combustion also contributes to excessive emissions, meaning that you’re going to lose some or all of the green emissions benefit you were getting by switching to biodiesel within the 1st location.In addition to oxidative compounds like aldehydes and ketones, formic acid, acetic acid, other organic acids, water and methanol are common products produced by fuel degradation. These end products of the oxidation process may be harmful to fuel injector equipment and can cause difficulties this kind of as injector clogging, corrosion of FIE components, gelling at low temperatures, and fuel seal failure.COMPARISONS OF BIODIESEL FEED STOCKSIncrease demand and competition in the marketplace mean that persons are making biodiesel from any feed stock they think could be suitable. As mentioned before, feed stocks give distinct characteristics to the biodiesel fuel, especially with respect to how stable they are and how well they resist gelling up in cold weather conditions.Saturated feed stocks have high stability and cetane ratings, but have a very high cloud point, meaning they gel up at higher temperatures. Coconut oil, yellow grease and animal fats are examples of saturated oilsMonounsaturated feed stocks are inside middle of the pack, with medium stability characteristics, cetane rating and cloud point. Examples of these feed stocks are peanut oil and canola oil. Some yellow greases also fall into this category if they are high in both saturated and monounsaturated components..Polyunsaturated feed stocks are most vegetables oils like soybean, corn and safflower oils. Biodiesel created from these oil have low cetane ratings and poor stability characteristics but are most resistant to gelling up in cold weather conditions.Intuitively a person would think that distinctive climates across the nation would spur producers to make biodiesel from only the feed stocks that give the cold flow and stability characteristics which are most advantageous for that climate. Animal excessive fat biodiesels should work best in climates like Florida (never gets cold but is always humid). Vegetable oil biodiesels (significantly less stable; better cold functionality) should be preferred inside the northern climates, whether it isn’t as humid (better storage conditions) but tends to get colder.However, the market will often dictate what a producer will use to make fuel, and that means low price and availability are the bigger concerns. That’s true all-around the world, where different countries make biodiesel from what’s available to them. In Canada, they use fish oil and beef tallow. Palm oil is typically used in tropical countries like Ecuador and Indonesia. In Europe, rapeseed is kind. Everyone uses what works for them.BIODIESEL SPECIFICATIONSOnly biodiesel FAME that meets all of the specification set down in ASTM D-6751 can legally be sold as “biodiesel”. It is legally assumed that if the FAME meets specification and also the diesel fuel meets ASTM D-975 specifications, then any biodiesel mix produced from those fuels will be in spec. The biodiesel specification ensures that the fuel meets minimum requirements for properties like Flash Point (ensures that it burns properly inside the engine), Acid Number (ensures the fuel has long been properly made and isn’t already becoming unstable) and Free Glycerin (ensures all the waste glycerin continues to be washed through the fuel). The ASTM specification includes these and about ten other properties. If the biodiesel is properly built, it will meet all these standards. If not, then it brings the potential for engine and overall performance issues for the consumer. As a consumer, buying your fuel from reputable suppliers will ensure your fuel meets this specification and won’t give you any challenges..CONCLUSIONBiodiesel blends offer helpful benefits to people who are willing and able to side-step the issues associated with it. Many of these challenges might be blunted by treating the fuel with an aftermarket product or service, of which there are many. As a consumer, you should expect many years of long-life from your equipment running on biodiesel.

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