[Stoves] [Biochar] Energy utilization from process

Wed Mar 2 10:08:24 CST 2022

Dr. Anderson

Thanks for your comments.

Hot start is a starting mode proposed by the Water Boiling Test (WBT) for
the cookstove assessments. This is discussed in the methodology section.

“Producer gas” and “The main product of the gasification-based or top-lit
updraft (TLUD) cookstoves is the fuel gas, (18) whose thermochemical
process is conducted similarly to the downdraft reactors. (19)” . For us,
it is true.

I don’t think that the thermochemical stages configuration depicted on our
Figure 14 be a mistake. The fixed bed reactor used in the TLUD cookstoves,
only the gasifier, is known with different names around the world
(Australia, UK, Spain, USA, and others).

Fixed bed reactor

Reverse downdraft reactor

Inverted downdraft reactor

Even, updraft reactor

According to my knowledge, this kind of reactor simulates the downdraft
reactor but in a reverse way. i.e., in a downdraft reactor the biomass is
processed following the stages (from top to the grate) of drying,
pyrolysis, oxidation, and reduction (gasification). In this reactor all
charcoal is not consumed, because the ashes could be molten deriving
problems. While, in the batch-type reactor, which is used in the TLUD
cookstoves, where the air is fed through the grate and the biomass is
ignited on top, the thermochemical stages of biomass are arranged as
presented in our paper. If you want, I can send you my PhD thesis where I
modelled this reactor-type and the contrasted results agree with my
hypothesis.

* THUS, OUR PUBLISHED PAPER IN A PEER REVIEWED JOURNAL IS NOT AN ERROR. IT
IS A WORK BASED ON OUR KNOWLEDGE THAT HAS BEEN PREVIOUSLY VALIDATED. SEE:*

Effect of biomass particle size and air superficial velocity on the

gasification process in a downdraft fixed bed gasifier. An

experimental and modelling study.

Juan F. Pérez-Bayer

El mié, 2 mar 2022 a las 10:33, Anderson, Paul (<psanders at ilstu.edu>)
escribió:

> To All who appreciate TLUD stoves,
>
>
>
> I encourage all to look at the cited article from Colombia.  I have
> scanned it and am reading in the Introduction and starting the Results.
>
>
>
> In many ways, it is good work.  Do look at the references to find some
> that we might have overlooked earlier.
>
>
>
> At this early stage, I raise two issues:
>
> For a TLUD stove, what is a “Hot start”?
>
>
>
> They discuss “producer gas” and “The main product of the
> gasification-based or top-lit updraft (TLUD) cookstoves is the fuel gas,
> (18) whose thermochemical process is conducted similarly to the downdraft
> reactors. (19)”
>
>
>
> PSA:  That is not true.    The error is continued in their Figure 14:
> Where they show oxidation zones and reduction zones above the pyrolysis
> zone, which would be the UP draft representation of what is in DOWN draft
> gasifiers which are designed to CONSUME the charcoal to make CO, not
> preserve the charcoal that can be called biochar.
>
>
>
> It is errors like this IN PUBLISHDED PEER REVIEWED JOURNALS that spread
> distrust for such studies and even worse will mislead those who are
> learning the basics based on such articles.
>
>
>
> In the References section, they did cite the 1996 article by Reed and
> Larson.   But no mention of the Roth’s excellent publication, nor any of
> other articles that are readily available.
>
>
>
>
>
>
>
>
>
> References 18 and 19 are:
>
> ·  *18*
>
> Varunkumar, S. *Packed Bed Gasification-Combustion in Biomass Based
> Domestic Stoves and Combustion Systems*; Indian Institute of Science,
> 2014.
>
> Google Scholar
> <http://scholar.google.com/scholar_lookup?hl=en&publication_year=2014&author=S.+Varunkumar&title=Packed+Bed+Gasification-Combustion+in+Biomass+Based+Domestic+Stoves+and+Combustion+Systems>
>
> ·  *19*
>
> Pérez, J. F.; Benjumea, P. N.; Melgar, A. Sensitivity Analysis of a
> Biomass Gasification Model in Fixed Bed Downdraft Reactors: Effect of Model
> and Process Parameters on Reaction Front. *Biomass Bioenergy* *2015*, *83*,
> 403– 421,  DOI: 10.1016/j.biombioe.2015.10.014
>
> [Crossref
> <https://pubs.acs.org/servlet/linkout?suffix=ref19/cit19&dbid=16&doi=10.1021%2Facsomega.1c05137&key=10.1016%2Fj.biombioe.2015.10.014>],
> [CAS
> <https://pubs.acs.org/servlet/linkout?suffix=ref19/cit19&dbid=32&doi=10.1021%2Facsomega.1c05137&key=1%3ACAS%3A528%3ADC%252BC2MXhslyiu77F>
> ], Google Scholar
> <http://scholar.google.com/scholar_lookup?hl=en&volume=83&publication_year=2015&pages=403-421&author=J.+F.+P%C3%A9rezauthor=P.+N.+Benjumeaauthor=A.+Melgar&title=Sensitivity+Analysis+of+a+Biomass+Gasification+Model+in+Fixed+Bed+Downdraft+Reactors%3A+Effect+of+Model+and+Process+Parameters+on+Reaction+Front&doi=10.1016%2Fj.biombioe.2015.10.014>
>
>
>
> PSA:  That is enough for this review.   I have productive work to do.
>
>
>
> Paul
>
>
>
> Doc / Dr TLUD / Paul S. Anderson, PhD --- Website:   www.drtlud.com
>
>          Email:  psanders at ilstu.edu       Skype:   paultlud
>
>          Phone:  Office: 309-452-7072    Mobile & WhatsApp: 309-531-4434
>
> Exec. Dir. of Juntos Energy Solutions NFP    Go to: www.JuntosNFP.org
> <http://www.juntosnfp.org/>
>
> Inventor of RoCC kilns and author of Biochar white paper :  See
> www.woodgas.energy/resources
>
> Author of “*A Capitalist Carol*” (free digital copies at
> www.capitalism21.org)
>
>          with pages 88 – 94 about solving the world crisis for clean
> cookstoves.
>
>
>
> *From:* main at Biochar.groups.io <main at Biochar.groups.io> *On Behalf Of *Ron
> Larson via groups.io
> *Sent:* Tuesday, March 1, 2022 3:54 PM
> *To:* albanesmolina at gmail.com; Discussion of biomass <
> stoves at lists.bioenergylists.org>; Biochar.groups.io <
> main at Biochar.groups.io>
> *Cc:* juanpb at udea.edu.co
> *Subject:* Re: [Biochar] Energy utilization from process
>
>
>
> This message originated from outside of the Illinois State University
> email system. Learn why this is important
> <https://help.illinoisstate.edu/technology/page-88179827.html>
>
> Luis: and two lists,  cc paper’s principal author (Prof. Juan Perez)
>
>
>
> 1.  Here is a quite pertinent TLUD technical article, very recent, non-fee
> and many of the excellent citations are in Spanish:
>
>
> Parametric Analysis of a Gasification-Based Cookstove as a Function of
> Biomass Density, Gasification Behavior, Airflow Ratio, and Design
>
> https://pubs.acs.org/doi/full/10.1021/acsomega.1c05137
> <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpubs.acs.org%2Fdoi%2Ffull%2F10.1021%2Facsomega.1c05137&data=04%7C01%7C%7C36ea82d077aa4348c17808d9fbce0326%7C085f983a0b694270b71d10695076bafe%7C1%7C0%7C637817684909093042%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=BDiB2IOicm7onBNreZqc972WVKXAvsQgpKgIS0fU2vc%3D&reserved=0>
>
>
>
>     2.  You and your students could help char-making stove technologies a
> lot by attempting to raise this group’s 10% char production to the 25% we
> normally expect.
>
> Prof. Perez’ team may not have been trying for maximum char - but many
> TLUD researchers  and biochar promoters are.
>
> My guess is that simply reducing the primary air flow will do a lot.
>
> Your goal could be to determine the relative value of their blower -
> probably most helpful in getting a high TDR = turn down ratio.
>
>
>
> 3.  I hope others on both lists will read the paper and comment on this
> team’s 10% char production value.
>
>
>
> Ron
>
>
>
>
>
> On Feb 28, 2022, at 9:50 AM, Luis Albanes <albanesmolina at gmail.com> wrote:
>
>
>
> Hello friends:
>
> I am about to start an thesis work with 4 mechanical engineering
> graduating engineers from a local university on ENERGY USE from biochar
> small reactors in El Salvador. Now that our national agriculture school is
> promoting the use and manufacture of BC with small units we intend to prove
> the use of the energy and test to find the most adecuate models for our
> agricultors.
>
> If any one can give advises please do so! remember this is for poor
> countries, some similar work samples would be ver useful
>
>
>
> _._,_._,_
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