<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:10pt"><div><span><div>Kevin</div><div>Years ago, while I was in the Navy, during a tour of the engine room of a warship, one of the turbine boiler engineers warned us that if we encountered even a tiny high pressure/temp leak somewhere in the steam plumbing, we wouldn't see it, but it would instantly slice cleanly through whatever body part got in the way.. I'd forgotten about how dangerous steam can be. Clearly not an option for small scale set ups, although a small steam engine with a professionally designed boiler with multiple fail safe features probably warrants further consideration. But you obviously wouldn't be building one yourself. Whereas once the tar issue is addressed in an environmentally responsible way, the opportunities to lose life and limb would seem less with a gasifier/ICE approach to using biomass, and is a tinkerers
dream.</div><div>One further question, If the tars stay in biochar from low temp BM pyrolysis, and the soil bacteria/myccorhizal fungi deal with them, (are even beneficial I thought), why is the tarry water from a gasifier scrubber such an environmental hazard?</div><div>Stuart.</div></span></div><div><br></div> <div style="font-family: arial, helvetica, sans-serif; font-size: 10pt;"> <div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt;"> <div dir="ltr"> <font size="2" face="Arial"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Kevin <kchisholm@ca.inter.net><br> <b><span style="font-weight: bold;">To:</span></b> Discussion of biomass pyrolysis and gasification <gasification@lists.bioenergylists.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, 2 February 2013 6:22 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [Gasification]
mycoremediation of tarry water<br> </font> </div> <br><div id="yiv562378733">
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<div><font face="Arial">Dear Tom</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Certainly, what you say could be true for 2 MW and larger
facilities that have the technical and economic economies of scale.</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Smaller gasifier and engine systems can deliver 1 HP for a
heat rate of about 16,000 BTU/hp-hr. If powering a generator, this is a heat
rate of about 24,000 BTU/kw-hr. I would doubt that small scale steam or ORC
plants could meet this heat rate. </font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Small gasification plants can be operated safely with a
conscientious Operator, having very basic training. Steam power plants of any
significant size and pressure, usually Stationary Engineers as Operators. With
smaller steam Plants, the Operating labour Cost can be very
significant.</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Best wishes,</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Kevin. </font></div></div></div> </div> </div> </div></body></html>