Re: [hobbicast] Waste Oil/Diesel Burner Nozzle
- Just a semi-unrelated note of interest regarding the burning of VO
and WVO in engines. In engines that do NOT have a precombustion
chamber (direct injection) both veg oil and waste veg oil as fuels
simply do not work decently. While they will burn, the temps are not
high enough to vaporize and combust certain elements of the oil and the
result is problems in the engine lubrication system as those materials
find their way into the engine oil. People who run WVO or straight VO
virtually all eventually have enough problems that they typically
Biodiesel is the product of reacting veg oil or wvo with caustic
(potassium hydroxide) dissolved in methanol, heating and agitating it.
The result is excellent biodiesel that causes NO problems, and a
significant percentage of glycerol. The glycerol is a "byproduct or
waste product", and is a good fuel for heating in a burner set up for it.
The process is simple, and the reactor is easy to build, but there
is some expense in it. I would suggest that a good fuel source would
be from a biodiesel operation, and that setting up a biodiesel reactor
and running it as a business....... let others collect and you process
for a fee, would offer a nice fuel source from the waste glycerol.
Heat from the crucible furnace could be used to heat the wvo in the
conversion process, and the waste product would provide the heat. You
could produce your own motor fuel at the same time. Two symbiotic small
businesses......... casting and fuel processing...... could co-exist
nicely under "one roof".
On 07/11/2012 02:36 AM, Matthew Tinker wrote:
> An interesting similar situation, the use of vegetable oil in diesel engines. To enable the oil to be sufficiently fluid for it to be injected it has to be pre heated, the older engines used around 120bars. I have no experience with the "modern" ones, but from what I can see they are much higher pressure.
> "Petrol" (Gas) injection systems run at 2 to 3 bars. A car or motorbike pump and pressure relief valve could be a useful source of pressure and regulation.
> I think it would be a good idea to have an alternative parallel diesel supply for starting and flushing the heavier oil from the system when shutting of.
> Regards, Matthew
> Matthew TINKER
> CNC conversion 1944 Colchester Lathe build-up log
> From: Rupert<rwenig2@...>
> To: firstname.lastname@example.org
> Sent: Tuesday, 10 July 2012, 23:19
> Subject: Re: [hobbicast] Waste Oil/Diesel Burner Nozzle
> Are you perhaps thinking of the low pressure injectors that are used in
> fuel injected gasoline engines? The ones I've worked with had the
> injector mounted so it sprayed into the intake manifold close to the
> intake valve. Some were continuous flow others were pulse flow. Also,
> some continuously sprayed into the mixing chamber (carb.)
> Interesting thread.
> On 7/10/2012 2:57 PM, David Knaack wrote:
>> That makes sense, thanks. I hadn't really considered the impurity problems.
>> Are impurities an issue for these spin atomizers?
>> On Tue, Jul 10, 2012 at 2:30 PM, StoneTool<owly@...> wrote:
>>>> It's pretty unrealistic. These are designed to be popped by a
>>>> high pressure spike, and the pressure is what provides the atomization.
>>>> They are also VERY sensitive to impurities. A conventional injector
>>>> would operate on a steady high pressure stream......if the pressure were
>>>> high enough, but offers no advantage over any other nozzle except that
>>>> the high pressure would atomize the oil very well.
- Your right it is complex I wonder how long it took to perfect that setup. Definitively over my head.
From: StoneTool <owly@...>
Sent: Wednesday, July 11, 2012 11:46 PM
Subject: Re: [hobbicast] Re: Forget the spinner
It is an elegant solution... it does require a pump and metering
orifice of some sort and there is the added complexity of having to
deliver the oil through the center of a spinning shaft in some way.
It's anything but a low tech solution!
>[Non-text portions of this message have been removed]
> I googled "rotary cup burner" and the image that has the spinning cone built into the blower seems to be the perfect solution. 1 neat unit supplying the fuel and combustion air at the same time.
> Steve D.