Hi Luke, Doug, you wrote, the Mk2 Mega Class gasifier was able to make enough gas to supply nine of these engines flat out, so testing one at a time placed no stress on the gas supply.
This is the output of the gasifier working at the top end of it's output for a base load application. Actually, the Mk2 could make a lot more gas than this, but fuel supply was a major issue at that development site, so was cut back to more manageable consumption. How do they achieve this kind of turndown ratio, apparently at least nine to one? The design for this series of gasifiers, had parameters matched to produce the optimum quality gas for engine powered electrical generation on base load. Not many 2 MWe engines operating in a variable load application on producer gas, but if the specifications called for a turndown capability, depending on the duration of the turndown, one might use two smaller gasifiers set up in parallel, and switch one off for lower outputs. For testing these small engines, the gas was drawn from the total output which was being flared in a combustion oxidation chamber, then into a stack. If you have not seen this, you can review the Mega Class reports up to February 2008 on the Fluidyne Archive www.fluidynenz.250x.com Gasifier turndown ratios are like any other specification set to some yardstick, so care must be taken when reviewing literature or any other persons results. The fuel plays a key role for stable gas making in most downdraft systems, and the turndown determined by either gas analysis, or more simple observations, like tar beginning to form in both the engine manifolds and gas cooling condensates. Hope this explains things missed out first time(:-) Doug Williams, Fluidyne.
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