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Do you need to improve the mixing in your processor? Would it be a waste of time to add a mixing eductor or would adding one result in cheaper fuel? This simple test takes the guesswork out of it.
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There are two pumps that are commonly used as biodiesel processor pumps. The NT Clear Water Pump has a long history of reliability when used as a biodiesel mixing pump. The less expensive Harbor Freight pump is considerably less reliable. For better or worse, homebrewing seems to be wedded to these pumps.
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The HF or NT pumps make good mixing pumps up to about 20 gallons. After that the lack of "inside the tank" mixing starts to effect quality. The solution as it turns out has been around for a long time in the chemical industry. Mixing eductors let us use small pumps to do big mixing jobs.
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We used this mixing eductor in a test with 12 people to see how well it would work in an Appleseed Processor. We found an inexpensive mixing eductr that we could fit through the upper element hole with a little work. Find out how it performed in this article.
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We used this mixing eductor in a test with 12 people to see how well it would work in an Appleseed Processor. We found an inexpensive mixing eductor that fit through the upper element hole with a little work. Find out how it performed in this article.
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One issue I have with the Appleseed biodiesel processor is that you have to add the methoxide slowly or quality will suffer. With the classic Appleseed we have to tweek ball valves to get an acceptable injection rate. The venturi ends all that by giving us consistant injection rates without any adjustment.
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In this article we upgrade a typical appleseed to include all steel plumbing, well mostly steel, and a venturi for methoxide injection. Now when we add the methoxide we just open the valve to the venturi and close the bypass valve and it sucks in the methoxide at just the right rate.
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In this article, Graham Laming describes his UK inspired non-siphoning heater tube. It is reprinted with permission from www.graham-laming.com. It includes a US version made from parts available in the US.
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How to make your own biodiesel at home
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