Dear Friends There is another solution and that is to put a small tar cracker at the base of the gasifier.
You have to inject some very hot air just above the grate. This early work was done by Mike Connor at Melbourne University. You really cut down the amount of tar coming out of the gasifier thus cutting your waste water treatment requirements. Also if you can breed the right bugs the small amount of tar you produce can then be composted I am in Ethiopia but somewhere I have Mike students thesis. Mike has retired but I may be able to track him down. Corner Peacocke also did some work on this and we used an external tar cracker using a mixture of hot air and hot steam. The higher the temp the lower the amount of air required. Regards from the North of Ethiopia Stephen Joseph On Sat, Jan 16, 2016 at 3:17 PM, Paul Anderson [email protected] [biochar] <[email protected]> wrote: > > > Dear Gasification Listserv and Biochar Listserv, > > The excellent comment by James Joyce (below) did not reach the > Gasification readers. It only went to the Biochar readers. Interesting > for two reasons (overly simplified, but to make a point): > > 1. Gasification for power (engines) is what causes the problem of > contaminated waste water, but those readers did not see the "solution > offered". THEY are the people who could test and evaluate the solution. > > 2. Biochar production (for agriculture and carbon sequestration) has been > proposed to make a filter-char that is to be burned, which is what biochar > production is trying not to do. That is, char as filter for wastes made > by trying to burn all of the biomass to ash. > > Those of us who are subscribed to both lists will see the full > discussion. Let's hope that this is a functional solution. > > (Of course it is better if the nasty contents in the waste water were not > created in the process of making the electro-mechanical power.) > > To James Joyce, I say "Thanks." > > Paul Anderson > > James Joyce wrote: > > Seems to me that the smallest foot print treatment would be to filter the > water through char, gravity dewater and then dry the char to less than 30% > moisture, then combust it at over 1000 deg C in a chamber that maintains a > 2 second residence time for the gases released from the combustion. That > will yield useful heat while destroying the recalcitrant hydrocarbons. In > locations with weather that does not make solar or even bed drying viable, > the process will generate more than enough heat to run a heated air drier. > > After the past mess if dealt with, such a process would probably only > need to be run for a day a week to treat scrubber water from storage tanks > (i.e. never put out to lagoons or open storage where it is of great risk to > the environment). > > The equipment required to do that is far less complicated than the > gasifiers themselves. > > Regards, > > James Posted by: James Joyce > <[email protected]> <[email protected]> > > > Doc / Dr TLUD / Prof. Paul S. Anderson, PhD > Email: [email protected] > Skype: paultlud Phone: +1-309-452-7072 > Website: www.drtlud.com > > On 1/7/2016 10:45 AM, [email protected] wrote: > > Tom, > Thanks for the compliment and appreciation. There were hundreds of "pot" > trials using a wide variety of treatments, extractions, etc. before the key > process was accidentally stumbled on. Other processes have evolved and > include the ability to take sea-water to potable with a fraction of the > cost of distillation or RO. > Assumptions about the tar properties including specific gravity can be > quite misleading. > One aspect of how to deal with the produced water from a gasifier is to > give it the right type of compound definition and once that is reached, it > makes it much easier to treat it. > Sincerely, > Leland T. "Tom" Taylor > Thermogenics Inc. > > _____________________________________________ Gasification mailing list to > Send a Message to the list, use the email address > [email protected] to UNSUBSCRIBE or Change your List > Settings use the web page > http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org > for more Gasifiers, News and Information see our web site: > http://gasifiers.bioenergylists.org/ > > > __._,_.___ > ------------------------------ > Posted by: Paul Anderson <[email protected]> > ------------------------------ > Reply via web post > <https://groups.yahoo.com/neo/groups/biochar/conversations/messages/18895;_ylc=X3oDMTJyMm43NWYzBF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRtc2dJZAMxODg5NQRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzE0NTI5NDY2ODA-?act=reply&messageNum=18895> > • Reply to sender > <[email protected]?subject=Re%3A%20%5BGasification%5D%20Re%3A%20Characterization%20of%20waste%20water%20from%20biomass%20gasification%20equipment%3A%20A%20case-study%20from%20Cambodia> > • Reply to group > <[email protected]?subject=Re%3A%20%5BGasification%5D%20Re%3A%20Characterization%20of%20waste%20water%20from%20biomass%20gasification%20equipment%3A%20A%20case-study%20from%20Cambodia> > • Start a New Topic > <https://groups.yahoo.com/neo/groups/biochar/conversations/newtopic;_ylc=X3oDMTJmMWVwODg0BF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRzZWMDZnRyBHNsawNudHBjBHN0aW1lAzE0NTI5NDY2ODA-> > • Messages in this topic > <https://groups.yahoo.com/neo/groups/biochar/conversations/topics/18895;_ylc=X3oDMTM3cW1hazlpBF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRtc2dJZAMxODg5NQRzZWMDZnRyBHNsawN2dHBjBHN0aW1lAzE0NTI5NDY2ODAEdHBjSWQDMTg4OTU-> > (1) > Visit Your Group > <https://groups.yahoo.com/neo/groups/biochar/info;_ylc=X3oDMTJmNXQ4cDM2BF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRzZWMDdnRsBHNsawN2Z2hwBHN0aW1lAzE0NTI5NDY2ODA-> > > - New Members > > <https://groups.yahoo.com/neo/groups/biochar/members/all;_ylc=X3oDMTJnajJhN2xlBF9TAzk3MzU5NzE0BGdycElkAzIyNDM4MDUyBGdycHNwSWQDMTcwNzQxODYxMgRzZWMDdnRsBHNsawN2bWJycwRzdGltZQMxNDUyOTQ2Njgw> > 1 > > [image: Yahoo! 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