[Stoves] LPG import in India

[tmiles at trmiles.com]

Modelling or tracking charcoal has been a frustrating exercise for many organizations. It's good to see that they are still working on it. Understanding charcoal production and use is important for use as a fuel and as a soil amendment. Fines from fuel production are used for fuel or soil depending on where you are. A woman in Western Kenya has a business making fertilizer from charcoal fines combined with manure and sawdust. Will her business survive the recent ban on charcoal production in that is intended to promote LPG?   

I agree that if they pick an emission factor they need to justify it as indicative of a range and highly variable depending on the conversion device and how it is operated.  

Tom 

-----Original Message-----
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of Crispin Pemberton-Pigott
Sent: Thursday, December 28, 2017 6:26 PM
To: Stoves <stoves at lists.bioenergylists.org>
Subject: Re: [Stoves] LPG import in India

Dear Tom

Of some relevance:
Modeling the Effects of Future Growing Demand for Charcoal in the Tropics

That is a decent look at net primary production (NPP) and use of forest. Two things are missing. Well, one is missing and one is off the rails. 

The missing thing is any mention that by 2100 the CO2 concentration is expected to be perhaps 450-475 ppm and this will create a much larger NPP‎ value, plus a drop in water consumption per ton. So the estimate of production and acreage and water use needs adjusting. To be useful it should have graphs, not a single number, CO2 against NPP. 

The thing that is off the rails is the statement about 'biomass having PM2.5 and PM10 of xxx per cubic metre' compared with charcoal. This clearly assumes that PM, VOCs and so on are inherent in the fuel, not created by the combustor. 

For a fancy bit of modeling that is a major faux pas. Missing is an estimate of how improved technologies will reduce those emissions over time based on current trends in combustion technology. 

A rise in CO2 by another 75 ppm will increase NPP by perhaps 15% which is much more than their predicted shortfall. A drop in emissions from burning wood of say, 98% would also change their scenarios significantly. 

Perhaps we should enter a correspondence with them. 

Regards
Crispin 

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