Improved Oil Burner-reduction NOx and CO-Blue Flame

[Capt_Maloche]

Hi manix

no, not that good, but we are improving

The molecules of nitrogen N combine with the molecules of Oxygen to form NO (x) from 1400 ° C and more surely around 1600 ° C I believe

NOx is an abbreviation used in the field of chemistry, pollution and air quality, which mainly groups together two gaseous, odorous and toxic molecules at low doses; irritation of the mucous membranes begins as soon as their content (by volume) exceeds 0,0013%.

Those are :

* monoxide (NO),
* nitrogen dioxide (NO2).

Was added thereto;

* nitrous oxide (N2O),
* dinitrogen tetraoxide (N2O4),
* Nitrogen trioxide (N2O3).

The compounds analyzed by the air pollution alert and measurement networks are NO and NO2, grouped under the generic term of nitrogen oxides (NOx). the maximum admissible Threshold set by the WHO is 400 µg ∙ m-3 as an average over 1 hour, and 150 µg ∙ m-3 as an hourly average over 24 hours.

It is a transformation linked only to temperature

Yellow flame burner

Principle of operation:

A deflector, by opposing a resistance to the passage of air, creates a depression allowing the attachment of the flame.

At the same time, passing through the slots in the deflector, the air rotates to obtain an intimate oil-air mixture in the form of a fine mist.

The pressure behind this deflector is around 1 to 3 mbar.
The spraying pressure is between 9 and 12 bar.

The deflectors of the yellow flame burners are characterized by widely dimensioned air passages, both at the slots and at the central orifice.

This explains the low pressure required in the flame tube to convey the volume of air necessary for combustion.

The flame temperature is around from 1800 to 1900 ° C.

Composition of rejections:
* CO: = Low to medium
* NOx: = high
* Unburnt: = weak to medium

Advantages:

* Simplicity, ease of adjustment, low flame noise.
* Most affordable price

disadvantages:

* High harmful emissions, heating body fouled by unburnt fuel causing reductions in efficiency.
* High flame temperature, resulting in high NOx production

If we mix 1 volume of burned and cooled gases in the hearth due to the heat exchanges with the walls and the dilution in the volume, with 1 volume of fresh air + fuel we will:
- reprocess unburnt items (reduction of soot)
- mechanically lower the flame T ° by depleting the% of O2
- inject water vapor back into the heart of the flame

The result is verified; a pale blue flame, reducing the flame T ° with a drastic reduction in NO production (x)

It's all good, my small sheet metal assembly holds up for now, still I have to hurry to make a slightly more durable version, TO BE CONTINUED ...

[Flytox]

Hello Capt_Maloche

To develop, check your system, do you have the possibility of making temperature measurements, to measure the real flame temperature obtained, in your cylinder for example (like super obvious access ... )
A+

[Capt_Maloche]

Hi fly

Eh no, I don't think my thermocouple will survive in this furnace

I'm not sure what to measure temperatures above 1000 ° C

otherwise, we could try with the color of the steel, but not easy when we know that the fireplace must be closed to recycle the gases

that said, my first montage was bright red in operation and was quickly destroyed, the second and final barely reached dark red (just see the photos) and did not move after a week
It is in itself the fact that the flame T ° is lower

In addition, the manufacturers who engage in this type of material claim that the NOx drops almost to zero, as well as the soot

[Flytox]

With a thermo couple K you can go up to 1372 ° according to:

http://www.mesurez.com/mesurez/francais ... ichage.php

At these temperatures, the service life of the thermocouple is very short ...

or that:

http://www.landinst.com/infrared/produc ... /index.htm


up to 3000 ° but to go and aim in your cylinder .... are you going to make a hole in the boiler? ...

[Capt_Maloche]

AH yes, I just checked, my thermocouple can measure up to 1300 ° C

But I might shoot him down ...

[Manix07]

Hi Captain,
OK and thank you for the definition of NOX and for the understanding of its training but apart from the assertions of some manufacturers this is only theoretical. It would be nice if we could slide a CO² control or other type of sensor into the chimney, it would optimize the result while tweaking the settings. The solution may be expensive for the amateur.

[Capt_Maloche]

no, I have a heating friend who should lend me his suitcase for combustion analysis, and we will also measure the opacity of the fumes

I'm also going to try a temperature measurement at the heart of the flame, it's really to make you happy

[taramop]

Don't worry cap maloche
I work in a quality laboratory and I do temperature monitoring (oven oven mold cryo enclosure and freezer)
I have stuff and I throw some that could still do (if we are not at 5 ° c near).

So measure your flame temperature and if your TC farts I should have what you need to replace it. (KJT couple or Pt100 probe)
Your improvement of burner interests me greatly because I am in loc and I heat with fuel oil (and it costs me a lot)

[Capt_Maloche]

Sold!

you can already send me 2 Thermocouple K probes with the yellow plugs (those with polarization)

I send you my address in MP

[Capt_Maloche]

Puppies!

My assembly with 2 ball fell and remained in front of the nozzle, I smashed all the boiler, day the bocson!

So I reattached it more seriously, and further back on the burner tube, suddenly, it's pretty good by increasing the air flow a little, but my smoke temperature increases by the same amount, so drop the efficiency, you will have to reduce the size of my nozzle:

The heap of soot on the left is all that had accumulated on the tube fallen in front of the burner's nose ... it will teach me to fix things correctly

Below, the tube centered and still dirty


As you can see, the tube is not at all degraded compared to the first narrower model.

All that remains is to reduce the size of my nozzle and increase the spray pressure