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Dual Fuel Gingery Type Furnace

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inthesticks:
Well looks like I made some progress on that fan. The 2 old salvaged fans I had in storage have squirrel cage wheels, good for volume not for pressure and the motor only draws 1.5 amps at 120V. I have a couple nice motors drawing 3.5 amps-1/4 HP which would be preffered. Using D. Gingery's book "How To Design And Build Centrifugal Fans" as a guide I made and installed 4 radial type blades into the original fan runner. These should increase pressure without impacting volume. I also made a adapting plate for the new motor. After reassembly I started it up and found the outlet pressure is 3-4 times previous. This was determined by simple hand over outlet press. I will eventually confirm this with a manometer I am looking for at least 3"s water column. The old fan was no more than 1".
This fan will ruffle my T-shirt standing 16' away. I will use this on a propane burner and and if it puts out enough to burn oil all the better.I was concerned about vibration from imbalance But it ended up running quietly and vibration free a little luck and the small diameter of the runner no dought.
Pictures 5 and 6 is the damper I installed to control the inlet.

Cheers
CB

inthesticks:
Hello All

Haven't done to much on the furnace lately, been mostly aquiring materials. Finally made that trip to the Toronto area for refractory material. In the first picture are the materials I now have. I hope this will do for at least 3 projects, the only thing missing is Durablanket 2600 which the supplier did not have in stock, no problem its light enough to ship anytime I plan to use it for a future forge project. The products from left to right, 2 pails of 3000* firebrick morter, 5 bags of castable 3200* hotface, 3 bags of fireclay, on top 2 1/2 boxes of A P Green G-26 insulating firebrick and 5 bags of Bentonite clay for making green sand, 3 bags of southern recommended for aluminum and 2 bags of western recommended for the heavier metals brass and iron.

The second picture are the popane tanks on the pad I cast a few years ago for this purpose. The plan is to pull from the 2 30# tanks. They will be tide in to the 100# tank with a switch over valve in case I run out in the middle of a melt or if I need higher press on a cool day. I went with the 2 smaller tanks for regular use because they will be easeir and more conveniant to transport for refilling. Some would say thats alot of expence for a hobby but that is not their only intended use. By far the majority of power outages around here only last 2 or 3 hours, usually a tree on the line somewhere. I have a small propane generater that I want to use in these cases as opposed to my large gas fired generater which is a bit of a waste if all you need is lights, electronics and a cup of coffee for a couple hrs. I'll revisit this when my connections and piping are all done.

Almost forgot I also picked up a clay graghite #8A crucible to try out an iron melt or two I hope. :clap:

Cheers Modders
CB

inthesticks:
Hello all, soggy wet day out there today but still managed to complete the waste engine oil day tank. The tank when in use will hang from my garage eave from a pulley and lift rope. The hieght will be 10' giving about 4 PSI at the burner (borrowed idea). The tank will be heated by a 300 watt KATS magnetic block heater (my idea) Temp will be checked periodically with a laser pointer temperature gun. The oil discharge pipe extends 3" into the tank to act as a stand pipe and prevent the krud settling out of the oil from leaving the tank. The bottom of the oil level site tube is 1/4" above the top of the stand pipe indicating the need for a refill. The cap on the fill pipe has a channel drilled from underneath to allow the tank to breath and prevent a vacuum. The last picture is the tank complete minus the oil hose and a black paint job. To soggy to hang and paint outside today.

Cheers Modders
CB

DavidA:
May I suggest an improvement to heating.

If you add a small (say 1 Litre) tank between your main tank and the outlet to the furnace, you could just heat this.
It would heat the oil in it much quicker than if you heat the whole tank. An, of course, as the hot oil is used,cooler oils will replace it and in it's turn be heated.

Just an idea. I this sometimes used by the SVO people who need to heat up cold veggie oil for their car fuel pumps.

Dave.

inthesticks:
Thank you for the imput Dave;

A good suggestion same idea as a flash water heater as opposed to heating a large storage tank. I don't plan on burning alot of WMO just my own production from yard equipment and vehicles. I now have a full 55 gallon barrel and I don't want to give up the space for another.That said the day tank will only hold 3-4 usefull gallons of oil this is only one large melt or two small ones. My main concern with heating is to get good flow to the burner and promote better seperation of solids at the supply tank and of course raising the temp. will improve combustion. I could complicate the system by adding an oil filter which would require pressurizing the tank bringing my shop compresser into the picture. A small heater like you suggest after the filter would be ideal and certainlly the way to go if oil was my main fuel.
The magnetic block heater is a quik and easy solution for occasional use and at 300 watts I will not be reaching temperatures higher than you would expect in  engine block heating.

Cheers
CB

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