Waste oil smelter build

[gaz1]

Its a syphon jet that sucks up its own oil and the air also atomises. The reason I have rigged it up to use a gas bottle as a resevoir is because I wanted to add a few psi to it so I can maintain a consistent oil flow, using it as a syphon the oil flow slows as the oil level drops which in turn alters the flame. All experimental atm but its getting there. Next stage is to tip the whole thing upside down and cast the refractory concrete lining in the roof to form an arch, dont think my bricklaying skills are up to building arches

Bob

wimp

 

[Kram]

I have been thinking how to do a small burner without compressed air. I dont have a great amount of waste oil, so may settle for diesel/parafin/veg oil burner instead.

@gaz1 have you seen any suitable videos?

 

[8ob]

I have been thinking how to do a small burner without compressed air. I dont have a great amount of waste oil, so may settle for diesel/parafin/veg oil burner instead.

@gaz1 have you seen any suitable videos?

Noooooooooooooooooooooooooooooooooooooooooooooooooooooo!

Bob

 

[carbon]

I am not sure if the igniter should run continuously or just on firing up.

The igniter should have a rating on it, usually marked as a percentage. If it’s 100% then it can be left running constantly. With a heater there is usually a photo cell used to monitor the flame and once lit the ignition can be turned off. In the event of a flame out the control unit can either turn the ignition back on or stop the heater

 

[8ob]

Would a dosing pump something like those that feed Eberspacher's run from a battery work as an oil feed Bob?

That’s a possibility Bruce, if the air pressure idea doesn’t work I will look into it. A lot of things can have an influence on the burn, oil pressure, viscosity, siphon jet, jet, blower and air/mixture control. I intend to batch mix, strain and filter the waste oil so I can take out that as a variable. I will get the burn 100% reliable before using it, I want to be able to load it and forget about it.

Is there a gaztube vid of a waste oil reservoir/ static head recirculating system anywhere?

Bob

 

[MattF]

How gaz has resisted telling anyone to f'off yet is beyond me.

 

[gaz1]

I have been thinking how to do a small burner without compressed air. I dont have a great amount of waste oil, so may settle for diesel/parafin/veg oil burner instead.

@gaz1 have you seen any suitable videos?

yes there is

Noooooooooooooooooooooooooooooooooooooooooooooooooooooo!

Bob

consider this

 

[8ob]

yes there is



consider this

If these poxy huge tube vids were in vhs format I would shove them where the sun dont shine

Bob

 

[julianf]

@8ob - I was just wondering how you were getting in with this, so was going to ask anyway, but also saw this question -

Is there a gaztube vid of a waste oil reservoir/ static head recirculating system anywhere?

Bob

The way I did this was by having a pump (central heating pump) on the fuel tank pumping around in a simple loop (really a hoop of 1" iron pipe about 2 foot total length with the pump mounted in it)

I put a tee after the pump and a valve after the tee (on the return to the tank), to control the back pressure, and another on the flow to the burner.

With the pump running the two valves can be manipulated to control the pressure / flow fairly well with some degree of stability.

I guess if the fuel heats up and changes viscosity (from going through the pump a load of times) then maybe things will change but, for the degree of precision I was working to, it seemed ok.

My setup (bouncy castle blower) is all wrong anyway though as the air flow is way too high and I end up dumping in loads of fuel, most of which, I'm sure, just contributes to global warming and not much else.

I'd like to cut down both air and fuel for a slower burn. My setup would probably be good for you're type of sizing though, but I'm just wanting to heat up an a20 crucible.

I keep thinking about making a dedicated scrapping furnace though as feeding in stuff to an a20 is tedious.

I've done the mesh bottom barrel over water before but thats very much batch process only (hard to refuel if the metal gets below the burn line).

My scrap is quite high surface area to volume also, and chucking it on a bonfire basically turns it all to oxide too.

 

[minimutly]

If you want to reduce airflow just choke the inlet to the fan?
Re your issue collecting melt, I’ve collected a couple of hundred standard bean tin sized tins, plan to tilt the melter, slide the tins along on a sled thing. One day when I get one of them round things...

 

[carbon]

My setup (bouncy castle blower) is all wrong anyway though as the air flow is way too high

If you want to reduce airflow just choke the inlet to the fan?

If the fan is a centrifugal type its possible to restrict the outlet without any problems, running with the output completely closed doesn't cause any over current issuse. Some spray booth extractors that were fitted with centrifugal fans had an exhaust baffle to regulate the flow across the filters

 

[julianf]

I can reduce the air flow simply by putting a brick on the pipe, but the setup is such that it performs better when flat out - ie becomes less stable when restricted with the current design.

A rethink is needed, not just less air.

 

[Anguz]

I have a big old central heating burner that may be more suitable? physically twice the size of a normal 30kw domestic one?

 

[Kayos]

I have a big old central heating burner that may be more suitable? physically twice the size of a normal 30kw domestic one?

I think they still have a relatively small jet though, may be an issue with the viscosity of waste oil?

I am decommissioning some big burners in schools this summer so may be worth grabbing a couple to see?

 

[8ob]

@8ob - I was just wondering how you were getting in with this, so was going to ask anyway, but also saw this question -

Yes, have since messed about with jets/air ratios and got a nice clean burn (blue), what I cant get is a restart with that particular setting without tinkering with it. What I really wanted was a thermostatic control and flameout function so I could turn my back on it while letting it do its own thing. As far as metalwork goes there is the door to build, refractory to cast and the firebrick to go in.

Bob

 

[brightspark]

bruv just uses a bouncy castle blower and restricts it with a slide gate on the inlet no need for anything fancy

 

[julianf]

Yes, have since messed about with jets/air ratios and got a nice clean burn (blue), what I cant get is a restart with that particular setting without tinkering with it. What I really wanted was a thermostatic control and flameout function so I could turn my back on it while letting it do its own thing. As far as metalwork goes there is the door to build, refractory to cast and the firebrick to go in.

Bob

Youre getting blue from waste motor oil? If so, that would be impressive.

With regard to reignition -

If you could automate an air restriction (maybe on a timer) for when it re-ignited, then that would possibly work. I know that ive had external burners before that wouldnt light from cold without me putting my hand over the air inlet to (imprecisely) change the ratio. If the ignition transformer feed could somehow slow the blower motor whilst it was firing that may work.

 

[premmington]

Compresed air and "babington burner"

 

[Anguz]

I think they still have a relatively small jet though, may be an issue with the viscosity of waste oil?

I am decommissioning some big burners in schools this summer so may be worth grabbing a couple to see?

Yes but they unscrew

 

[Kayos]

Yes but they unscrew

Also the pump. If I can grab some I will offer them up as freebies if someone wants to try