Posted 10 May 2011 - 04:32 AM
On the second run of only 30 minutes I got the same amount of liquid in the jar. Hearth hit 540 C. Reactor vacuum was 4". Vacuum at ignition port was 1".
Running wood fireplace pellets.
Do I need to run a Totti or other device to help with moisture and tar processing?
Was the charcoal in the reactor to start what gave me the high temps on the first run?
How do I drive the reactor to the 600 C range? Will it help the tar?
Posted 12 May 2011 - 07:54 AM
Standard wood pellets are a bit on the fine side for the GEK.
If you had a starting load of coarse charcoal in the reduction bell this may have given those first high temperature results at lower reactor pull rates.
Once things settle in on pellets, pulling 4 inH2O is going to be low to maintain reasonable temperatures (the finer material packs the reduction bell more, leading to lower flows at a given reactor vacuum). The pressure ratio of 1/4 = 0.25 (P_comb/P_reactor) indicates a constricted flow through the reduction bell. When automating systems, we start shaking the grate more frequently when the ratio falls below 0.3.
In short, for pellets you'll need to run the reactor at a higher vacuum to maintain reasonable temperatures. Ideally you want to see the top of reduction above 800°C to get reasonable tar cracking.
This graph shows temperatures vs. reactor vacuum with different fuels. You can see pellets ran cooler for a given reactor vacuum.
Posted 13 May 2011 - 09:48 PM
I got 736C at the hearth and 775C below. The vac at the ignition port was 3 3/4" and blow was 6 1/4".
It flared a ton of gas. I think it would take a large engine to produce that much suck. Maybe pellets are not going to work, even for testing.
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