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<div class="moz-cite-prefix">On 05/01/2016 1:28 PM, Peter Davies
wrote:<br>
</div>
<blockquote cite="mid:568B2A43.2010108@gmail.com" type="cite">
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Dear Tom,<br>
<br>
The end of 2015 has been very busy for us, and the start of 2016
looks even busier. Essentially we have successfully proven our
gasifier systems with high ash, pelleted ag-residues in a high
temperature, low tar gasifier scenario with simple dry scrubbing.
Even when slightly over aspirated with some residual oxygen coming
through the tars were limited to low viscosity condensates (and
very little of these), though the gas quality varied slightly with
the appearance of some C2-C8 hydrocarbons (nothing higher though,
within detectable limits of the GC system used by the lab). We
also now have one of the leading European CHP providers sign off
on our gas quality for use in their IC engine systems, so expect
to be able to supply complete turnkey plants shortly which have a
global support network.<br>
<br>
Yes it does require a pelleting step at this stage, but we are
working with a couple of pellet equipment manufacturers for a
lower cost, gasifier optimised pellet which will be substantially
cheaper and lower maintenance than conventional wood pellet plants
used for the combustion industry. Accompanying innovative
financing for village scale densification systems is also now well
advanced.<br>
<br>
So we don't agree that water scrubbing is either necessary or
where gasifiers will be in the future. However if you only have
old gasifier tech to work with then you can try torrefied sawdust
filters to recirculate your scrubber water through, our early
testing found these very effective till we fixed the hearth core
in the gasifier design so they were not needed.<br>
<br>
New Years Cheers,<br>
Peter<br>
ID Gasifiers Pty Ltd<br>
Australia.<br>
<br>
<br>
<div class="moz-cite-prefix">On 5/01/2016 2:31 AM, Tom Miles
wrote:<br>
</div>
<blockquote cite="mid:003901d14704$fa679a30$ef36ce90$@trmiles.com"
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<p class="MsoNormal">Since 2005 hundreds of small scale
gasifiers have been installed in Myanmar, Cambodia and other
South East Asian countries to offset high cost diesel to
generate shaft and electric power in rice mills and palm
factories. They are often in the 100+kW scale. Initially
they were dual fueled with diesel but increasingly they are
100% producer gas. Ankur Scientific introduced a dry
cleaning system in 2009 but in most cases the gasifiers use
water scrubbers and the waste water and sludge is discharged
into ponds without remediation. Simon Shackley and others
have published a thorough characterization of waster waters
from several gasifiers. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Crop residues are best gasified at low
temperatures. Low temperatures generate tars. Scrubbers are
the lowest cost cleaning technique. Water strips toxic
chemicals from the gas which become carried into the
environment with water and sludge. Gasifier char is very
useful. Sludge and black water are dangerous. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The remediation of gasifier wastewater is
a challenge for us. As we look forward to installing small
scale gasifiers around the world we need to solve this
problem . What are your solutions for filtering and
remediating gasifier scrubber water? One solution might be
running continuous blowdown though a vegetated biological
filter where the biochar is used as part of the media. What
have you tried?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tom<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">T R Miles Technical Consultants Inc<o:p></o:p></p>
<p class="MsoNormal">Portland, OR 97225<o:p></o:p></p>
<p class="MsoNormal"><a moz-do-not-send="true"
href="mailto:tmiles@trmiles.com">tmiles@trmiles.com</a><o:p></o:p></p>
<p class="MsoNormal"><a moz-do-not-send="true"
href="http://www.trmiles.com">www.trmiles.com</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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</blockquote>
</blockquote>
<br>
Tom, what about VCD using waste heat from the gasifier ?
Possible ? David Murphy<br>
<blockquote cite="mid:568B2A43.2010108@gmail.com" type="cite">
<blockquote cite="mid:003901d14704$fa679a30$ef36ce90$@trmiles.com"
type="cite">
<div class="WordSection1">
<p class="MsoNormal">Characterisation of waste water from
biomass gasification equipment: A case-study from Cambodia<o:p></o:p></p>
<p class="MsoNormal">Article in World Review of Science
Technology and Sustainable Development
12(2):126-151 · December 2015<o:p></o:p></p>
<p class="MsoNormal">DOI: 10.1504/WRSTSD.2015.073829<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Abstract<o:p></o:p></p>
<p class="MsoNormal">The gasification of rice husks for
small-scale power generation in rice mills and other small
factories in Cambodia has spread rapidly in the past decade
and has a favourable investment payback period where the
facility is off-grid. The technology is widely regarded as a
sustainable, low-carbon power option. However, installed
gasification technologies produce a black waste water which
is frequently disposed of into the local environment without
any treatment. An analysis was undertaken to identify and
measure the key potential contaminants and compare
concentrations in the water and sediment with regulatory
thresholds established in Cambodia and within other
jurisdictions. It was found that concentrations of organic
contaminants such as phenols and benzene-type molecules
(BETX) (water and sediment) and polycyclic aromatic
hydrocarbons (PAHs) (sediment), as well as macro water
quality indicators, were far higher than regulatory
thresholds prescribe, posing threats to sensitive aquatic
ecosystems into which such waste is introduced.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<pre class="moz-signature" cols="72">--
Peter Davies
Managing Director
ID Gasifiers Pty Ltd
Delegate River, Victoria
Australia
Ph: 0402 845 295</pre>
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