Working dimensions of my new J-tube

[Deleted]

Jun 9, 2014 13:23:10 GMT -8 photoman290 said:

or can use another form of potassium and make silicate from that instead

Take potasium hydroxide and dissolve silicates with it eg. diatomaceous earth
or fine quartz powder or christobalite powder.

potasium hydroxide
www.ebay.co.uk/itm/5Kg-Potasium-Hydroxide-/201101312877?pt=UK_BOI_Medical_Lab_Equipment_Lab_Supplies_ET&hash=item2ed292836d

Diatomaceous earth (white or calcined would be best)
www.ebay.co.uk/sch/i.html?_odkw=Diatomaceous+earth+kg+white&LH_BIN=1&_sop=2&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.XDiatomaceous+earth+kg+&_nkw=Diatomaceous+earth+kg+&_sacat=0


BTW

I have just ordered some kg for experiments
Ball-Clay Hymod Prima
China Clay Grolleg (a bit finer than kaolin 233)
cement fine grog
white fat clay
Sodium hydroxide
Burnt lime powder (calcium monoxide)

I will try to avoid use of caustic liquids, just using powders.

I have ordered one liter sodium waterglass,
just to see if there will be much differnces

[RajeevAgarwal]

Hi Smarty
Thanks for the complete thread including the pics and your calculations etc.
How or where did you get the '1.3 times S/S' from? I mean why not 1.25 or 1.4? Why 1.3?
Btw, FYI: I have downloaded and read peterberg  's xls on sizing Rocket Batch Heaters, and there is a constant (0.7236) used to arrive at a base ratio
Thank you
Rajeev

Apr 27, 2014 1:04:43 GMT -8 smarty said:

Ok. So following on from the discussion on the thread about my J-tube that chocked itself off on unburned charcoal I have decided to make one in ceramic shell to see if performance can be increased.

Since I am trying to retrofit the rocket stove into an existing solid fuel cooking stove that a few things limit my options. The system size - based on the flue outlet of stove is about 4", the necessary length of the burn tunnel, and the maximum height of the riser.

Together these things mean I need a J-tube that is 1.3 system size. So here are my workings out:

1.3 System Size Where S/S = 100mm

1.3 x S/S = 1.3 x 100 = 130mm

Measuring from top of feed tube to centre of burn tunnel, centre of feed tube to centre of riser, centre of burn tube to top of riser.

proportion of elements: Feed Tube : Burn Tunnel : Riser = 1 : 2 : 4 where 1 = 1.3 S/S = 130

FT : BT : R = 1 : 2 : 4 = 130 : 260 : 520

FT = 130

BT = 260

R = 520

Adjusting these measurements for division into separate element of the stove for the purposes of construction we have as follows:

FT = 130 - 50 = 80 = FT measured top of BT to top of FT

BT = 260 + 100 = 360 = BT measured end to end.

R = 520 - 50 = 470 = R measured top of BT to top of R

Now I'm off to make a cardboard core based on these measurements around which to lay up my ceramic shell.