polycombustible steam boiler

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yannouk
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Registration: 16/10/13, 22:30




by yannouk » 27/12/14, 11:32

danielj: indeed with my passive stove, I encounter a problem, the duct clogs quickly, I deduce poor combustion.
Is the addition of air the solution?

I wonder before getting there if there would not be an adaptation to do on my stove to improve combustion ... No more holes in the oxygenation tube for example ....
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the boulle
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by the boulle » 27/12/14, 13:45

Hello,

that's good, you have to work by !!

for yannouk, I saw your stove, it is good, but the system which works with vacuum, requires a lot of draft is a large number of air intake holes, because its risk of black smoke is to make particles! !, try to redo lots of small holes (3mm) to turbulate the gases inside is to oxygenate well.



for danielj, great, we want pictures !! :P
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yannouk
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Registration: 16/10/13, 22:30




by yannouk » 27/12/14, 13:51

Thank you, I will try to add some holes;)
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danielj
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Registration: 17/10/12, 18:18

poly combustible spray pot




by danielj » 29/12/14, 16:08

Danielj on 26-12-2014 ...... It's a bit long, but it sums up months of testing!
Following my first discovery in 2013 of oil vaporization with Jaques Albert from "ECOTECO" (see his site) and the invention of Marc Feller (ceramicist inventor), I looked for other sites and I am stumbled upon ECONOLOGIE.com and this blog ... (see from page15 ...)
After many tests I take stock.

My goal was to solve all the problems and to size a spray pot for the heating of my house. And to automate the operation.
The house is 165m2 and is well insulated, I have a TBT hot water underfloor heating powered by an 8 kw electric boiler (yes that's enough! ...), I am in the Lot et Garonne ...

I started with tests on a mini pot diam. inter. 63mm and h = 115mm to see the feasibility and test the power burned by measuring the flow of oil consumed per unit of time, ie + - 2,5 kw.
Air pressure and air flow was my research, as well as the start-up automation. Finally the minimum pressure is low about 0.1 bar, but the flow must be in accordance with the consumption of the flame to have a stoichiometric volume and therefore good combustion, good efficiency, and no polluting or toxic discharges (yes, it can) .

So the number of holes in the air rod must be adjusted. I started with holes of a millimeter, it's too fair because you have to increase the air pressure. Finally I make holes of 2 millimeters, but I think we can make a little bigger, without going to 6 mm, because there the combustion degrades! (less turbulence effect).

I am looking for a power of + - 12 kw. I made a bigger pot, with an inner diameter of 70mm and h = 134mm, I got 7 kw. I realized that the maximum power is + - proportional to the volume of the pot.

In addition I notice a degradation and a rapid oxidation of the external surface of the pot which rises to 800 or 900 ° C ... Will we have to find thicker pipes (here 3 and 4mm), or stainless steel?.

I recovered an old wall-mounted gas boiler 'themis 223' of 23 kw. I kept the water pump and the copper exchanger, I removed the gas burner and the kerning which surrounded the flame (and which was lined with asbestos it seems!).

I made a 0,8mm stainless steel fairing in the shape of a cone to channel the flow of flames from the pot to the exchanger. I made a last pot with an inter diameter of 108mm ep: 3.5mm, h = 135mm. to put in this boiler.

I supplied oil (rapeseed) with a fuel pump from a domestic boiler 50kw, which I run without back pressure, at low speed + - 1 revolution per second. it is driven by a cordless drill with variable speed using a set of pulleys (ratio + - 1/3) because it was rotating too quickly for the pump and the torque was insufficient.

The air rod (steel) is 14mm in diameter, with 26 2mm holes. It is equipped with a 1/2 inch tee with two cones which allows me to inject air AND IGNITION GAS to be able to automate the starting of the boiler! See attached drawings.
A gas tap allows to regulate the gas flow (a steel wool pad on the seat allows a progressive adjustment).

A gas regulator at 2,5 bars supplies this gas injector, because the air pressure is higher than that of an ordinary regulator (either 0.025 bars or 25milli bars) regulator initially intended for a thermal weeder!

A piezo spark generator recovered from the old boiler allows me to ignite remotely, remains to find an electric generator (230v) of sparks type gas plate!

the air flow is ensured perfectly by a motor-turbine of vacuum cleaner and its variator (placed in a wooden box). A pressure gauge (class 1%) measures the air pressure.

A scale measures the weight of oil consumed per unit of time (15 minutes).

A thermometer allows me to measure the temperature of water leaving and entering the boiler, therefore to deduct the useful power supplied, knowing the water flow rate of 20,71 l / min (weighed water) ...

A wattmeter measures the power absorbed by the fan.

The startup does this as follows:
1- running the water pump and the fan, 2- spark generator, 3- opening the propane ignition gas, 4- waiting for a sufficient temperature of the pot (+ - 600 ° C), 5- stopping the sparks , 6- oil pump running, 7- time to let the oil ignite, 8- ignition gas stop, 9- minimum and maximum temperature safety devices released!

The judgment:
1- stop the oil pump and the fan, 2- stop (if any) the water pump.

Preliminary calculations:
The water flow through the boiler is constant and is 20,71 l / min (i.e. 345,2 gr per second), therefore for 1 ° C of delta t:
1 calorie per second = 4,18 joules / second (or watt), corresponds to 1gr of water raised by 1 ° C in 1 second. If the flow rate is 345,2 gr / s we have:
Pw = 345,2 x 4,18 = 1443 w per ° C. from delta t.

The PCI for rapeseed oil used here is 10397 wh per kg.

The tests are summarized below:

Measures n ° 1: (oil pump: + -1 turn in 6 sec.). Noise present but weak.
P.air mini + air bypass; M.ventil = 200w; Dt = 9,5 ° - 7,5 = 2 ° C; P1 = 1443x2 = 2886 w; 0,340kgr. oil / h = 10397x0,340 = 3535 w consumed. ; yield / PCI = 2886/3535 = 82%.

Measures n ° 2: (oil pump: + -1 turn in 2 sec.). Medium noise.
Air 0,2B; M.ventil = 310w; Dt = 13 ° - 7,5 = 5,5 ° C; P2 = 7936 w; 1,048gr oil / h = 10397x1,048 = 10896 w consumption. ; yield / PCI = 7936/10896 = 73%. (too much excess air!)

Measures n ° 3: (oil pump: + - 1,1 turns in 1 sec.). Quite loud noise.
P.air 0,25B; M.ventil = 420w; Dt = 16 ° - 7,5 = 8,5 ° C; P3 = 12265 w; 1,484gr oil / h = 10397x1,484 = 15429 w consumption. ; yield / PCI = 12265/15429 = 79,4%.

Measures n ° 4: (oil pump: + - 2 turns in 1 sec.). Loud noise.
P.air 0,30B; M.ventil = 750w; Dt = 19 ° - 7,5 = 11,5 ° C; P4 = 16594 w; 1,908gr oil / h = 10397x1,908 = 19837 w consumption. ; yield / PCI = 16594/19837 = 85,6%.

Note: the measurement of delta t. is imprecise because my thermometer is only accurate to a quarter of ° C ...
The overall yield can be calculated taking into account the consumption. fan ...

Important note, the amount of air injected, must be adjusted carefully, because the performance depends a lot. Too much air: the yield drops a lot; lack of air: lower yield, unburned, very toxic gases in the smoke! Danger !

The evaluation of the noise is important, and it appears that it will be necessary to make a boiler room outside the house, because the noise level is too high at most!

It remains to invent an electrical scheme. to manage it all automatically!

See the drawings and photos below ...

The videos will follow!
Happy new year's eve :)
polycombustible-small-pot-of-vaporization-pic743.jpg
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polycombustible-small-pot-of-vaporization-pic744.jpg
polycombustible-small-pot-of-vaporization-pic745.jpg
polycombustible-small-pot-of-vaporization-pic746.jpg
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danielj
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Registration: 17/10/12, 18:18

Re: poly combustible spray pot




by danielj » 29/12/14, 16:42

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The videos will follow!
Happy new year's eve :)[/ Quote]
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danielj
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posts: 93
Registration: 17/10/12, 18:18

poly combustible spray pot




by danielj » 29/12/14, 17:10

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danielj
I understand econologic
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posts: 93
Registration: 17/10/12, 18:18

poly combustible spray pot




by danielj » 29/12/14, 18:14

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yannouk
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by yannouk » 29/12/14, 18:40

What a job!!! I haven't taken the time to read everything yet, but in advance, hat;)
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danielj
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Registration: 17/10/12, 18:18

poly combustible spray pot




by danielj » 29/12/14, 19:51

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danielj
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posts: 93
Registration: 17/10/12, 18:18

poly combustible spray pot




by danielj » 29/12/14, 19:53

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