<html><head></head><body lang="en-GB" style="background-color: rgb(255, 255, 255); line-height: initial;"> <div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Dear Andrew</div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">You are on the right track but this is done in a really different manner from general intuition. </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">There are two ways to make salt. Dig the mud from the inter-tidal zone and filter the salt out using sea water, and purifying evaporation pan salt, the dirty part. </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">The first approach is done in Sumba Island and the water from the strainer is 24% salt. The method in Lombok is to process dirty salt by dissolving it in water which does into the stove at about 20% concentration. It precipitates as the concentration reaches 332 g/litre. </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">The efficiency using rice hull is about 30% which is not too shabby considering the technology level. There is obviously a problem with the corn cob burner. It is a big 'particle' and let's a lot of air through so there is always an air problem. If you throw a lot of cobs onto the fire then it generates a lot of gas very quickly so manual feeding has to be well managed. </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">The secondary air hole is also the feed hole so that is something that needs to be addressed too. Corn cobs are pretty good fuel - good energy content and not too much ash. It has the same bulk density as rice hull but 50% more energy. </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">So file that picture in the Department of Spectacular Flames. I will send a picture of the 2.7 MW wood fire when I see it in action. It doesn't run very often. </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Regards </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Crispin </div><div id="_originalContent" style=""><div class="PlainText">
<br>
>Dear Friends of Salt<br>
><br>
> <br>
><br>
>This is a photo of a corn cob-fired salt boiler in Lombok Island, Eastern<br>
>Indonesia. The hole from which the flame is emerging is the secondary air<br>
>inlet. You may wonder why there is a large flame coming out of it. Well,<br>
>that is a good question. The reason is that so much air is getting through<br>
>the grate that it is able to support the gasification of the fuel and send<br>
>flames to the chimney at one end and out the air intake at the other. It<br>
>could use a little tweaking.<br>
<br>
<br>
It looks like it's wasting a fair bit of heat, does the water have to<br>
boil or just gently evaporate leaving crystals as more seawater is<br>
added. Why are there loose cobs around this "secondary air inlet"?<br>
<br>
Presumably only using the flat bottom of the pan as a heat exchanger<br>
is limiting thermal efficiency as well as losses to this flare.<br>
<br>
With seawater yielding about 40kg/tonne it must be evaporating ~2<br>
tonne of water whose sensible and latent heat would be around 1350kWh<br>
which at 100% efficiency would need the stove to run for 16 hours!<br>
<br>
Or does my maths need checking again?<br>
<br>
AJH<br>
<br>
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