Prologue for Biomass Combustion Process Analysis
17 January 2018 • 119 views
The mere fact of smokeless combustion does not yet mean total combustion, despite the invisible smoke from the chimney.
It is easy to check, with a simple test, that the chimney emits into the atmosphere a lot of unused, (invisible!) fuel in the form of thinning carbon (soot!), which must be accompanied in a certain part of carbon monoxide – CO. Just preview the flame color. If you see the yellow color of the flame, it means that we see a hot soot, which is so shining.
To see it later, it is enough to hang a bright pot with cold water over this flame – then this soot will be precipitated and the vessel will be dug just like above the kitchen burner, which badly burns the same fuel, eg. – Natural gas—>Example (“Ranger Test”).
Searching the Internet with descriptions, YouTube and videos – nowhere did I find the construction of a “normal, classic” furnace, boiler (with single exceptions – gasifying chamber!) – showing the expected Process ->Pattern Nadto – I made sure that so widely built furnaces so-called. “missile”, complemented to improve the so-called secondary air, vortex – continue to generate that yellow flame… (from almost white, yellow, orange, red – to brown and black soot.!). Yellow flame (from white – to black !) – is a heated soot, which is always accompanied by generated carbon monoxide – CO.! They generate in the Reduction Process (endothermic reaction.!) – which lowers the temperature of a bright yellow flame!
Te.., two, additional fuels – formed at high temperatures with oxygen deficiency – O2, which was previously used in most – burning the first portion of charcoal and part of the pyrolytic gases. Only additionally generated with this soot… (CO – carbon monoxide.!) – partially can be “burnd” – by bdb heated secondary air – PW… (skillfully served in the right place.!).
Even the brightest, white-yellow flame
it will never reach such a high combustion temperature as transparent with a blue glow with dynamic wood burning. Avoiding reduction zones (which generate this soot – C4+CO.!) – we do not receive heat from this flame and, as… blue – much less radiated… heat – than the white-yellow… (and… transient shades – in… orange., red !).
The shade of this blue also indicates to us the level in the temperature range. “Dilution” of blue color – is the result of faster combustion of degassed coal and a higher share and emissions of transparent CO2 + N2
Wolniutko “heaving” flame blue (without chimney!) – gives temp. approximately +800°C. The most transparent with blue glow – (without reduction zones and exothermic reactions.!) – up to approx. 10 000 in 2015. +1300°C, where in a larger %-cie – is burned, de-extinguished coal… (possible, a further increase in this temperature – with a higher hydrogen contribution in the composition of wood gas!) —>Patterns
Completely transparent exhaust gases – up to approx. +1400°C (especially – with strong convection!) – it… flameless combustion (already degassed charcoal!) —>Pattern
Comparing the same degree of transparency of the two flames – yellow vs. blue – the difference is that both of these flames are the result of an equally higher share of %-go – the amount of transparent CO2 – after burning clean, degassed coal!
This causes the temperature of both flames to rise, – the coal burned raises these temperatures, at the same time transparent, hot CO2 + N2 – r o z r z e d z a
Both… o d c and e n i e … these colors… –
(blue… and … – yellow!).
So – NOTHING LOWERS THE TEMPERATURE of such a, transparently comparable blue flame, which unlike the yellow – radiate the heat ninimum.!
There is only one – N I U A N S .!
Long “tongues” of yellow flame (heated soot.!) – they carry their temperature to a greater distance from the surface of the embers – compared to hot exhaust gases (N2+CO2+H2O!) – blue flame (without this soot!). Heated solid particles (soot!) – transport heat to longer distances – than just the heated exhaust gases themselves! Simply – kinetically accelerated by convection (or fan!) – heated, large particles of solid fuel (soot.!) – they cool down “along the way” – slower than the same heated micro-gas particles.
THIS should be – o c z y w i s t e… for every designer, manufacturer and furnace smoker! Unfortunately, the opposite is true. They boast of the chisels “tongues” of this bile, they compete in this length – measure the length by a… – tape measure.! —>Example “The price to pay” … for this, long-range heat transport – is … about 30% higher consumption of optimally unused fuel + pollution of our atmosphere.!
All, these “modern” boilers (GS-y, DS-y) – have well-placed exchangers from the embers, and some still have “along the way” “chambers” in which fumes are mixed with a miscontrited name – “afterburning” (instead of the proper – only thinning N2+CO2+H2O+C4<—sadza – mieszanie z zimniejszym powietrzem wtórnym.!). Such furnaces are not suitable – neither for processing for continuous combustion with blue flame, nor for the correct transmission of energy from the most perfect fuel combustion.! Soot – as a figure of a “perfectly black body” – absorbs and does not reflect light. Therefore, with a large thinning of transparent exhaust fumes – it is not visible in the air at the outlet of the chimney. “Traditional” anti-current combustion… (or erroneous, co-current.!) – non-carbonated solid fuels – emits large quantities of solid fuels – as concentrated. Only then is it visible – as black, thickened clouds of soot.
Analyzing from scratch the Theory of Combustion – I made further constructions (eliminating the noticed unwanted effects!) – I managed to build two experimental furnaces (upper and lower combustion!) – which do not “mound” the pot with cold water and create a flame from blue to almost transparent with blue glow … (the difference in shades depends on the dynamics of combustion, the chimney thrust!). All structures with a wear: no electric current and fan. When we start the analysis of biomass combustion, we will refer to the source descriptions, a large part of which I have included in our Bibliography.
I realize that this tab can be supplemented with very valuable, helpful to us – other materials, so I appeal for these additions, providing address links, attachments for such enrichment.
Note! So my stoves – as well as the ones we design here – are not TLUD’ami.! Do not confuse you with the fact that you include examples of TLUD’ów in our “Bibliography”. This is only for discussing certain aspects of the Combustion Process. In tlud-type stoves – the residue is unburned charcoal, and the blue flame comes mainly from burning after pyrolysis – wood gas.
Machine construction technologist, yacht captain of the great navigation, musician, constructor.
17 January 2018 • 119 views