Grateless DriZzler, Rostlosen DriZzler.
Verfasst: 12.02.2015 21:52
Hello folks,
Long time not beeing on the forum, because hard working on our new projects. "The grateless gasifiers". First is a standard DriZzleR, adapted for grateless gasifying, and the second is a grateless updraft. The latter beeing a totaly new project nor tested.
The downdraft DriZzleR, is so far finished, that we could preform a proof of concept test. We fired it up two day's ago and let it run undisturbed for 7 hours and something.
Normaly, the grate DriZzleR, after an operating time between 2 to 5 hours starts to show isues. Depending on the fuel the grate starts to block. Either from heavy ashloaden wood or from a mixture of ash and impurety's, (nails, stones clinker.....) The result of a partly blocked grate is, higher presure drop and lesser production of gas.
With a special designed grate, pyramidical, revolving or other, one could lenthen the operating time. In a small agsifier the easiest method chosen is shaking or turning the grate.
Our solution is eliminating the grate all together. Simply just removing the grate without side precautions was not the solution. I works well but ireulary. Sometimes after a short time, sometimes only after a longer time the uneven build up of charcoal give fuel flow isues. The easiest solution one think of at first, is an ash and charcoal auger remover, trigered by time, underpressure or temperature. That is a real pitty because a lot of good charcoal will be waisted.
Finaly we came up with a process we called, "The suspension principle". Again as in every gasifier, there is no such thing as a free lunch. To bring your gasifier in suspension, the gasifier must be in balance. DriZzleR tube diameter, suction and fuel feed have to be in a certain relation. When these three elements are in harmony then over time the gassed out wood desintegrate into the finest elements, comes in suspension with the gasstream and is evacuated together with the gas.
The non gasious are then filtered out in the cyclone and prefilter.
The gasifier runs continious, only fuel has to be delivered but no manual periodiacal clean out is needed. For best function the process has to be helped a little. When one pushes the fuel it generates inside the gasifier small shockwaves that gives off the exstra push to launch the internal clouds of ash. Same as a grate shaker taht blows off the ash and dust from the coal. Only here we have no grate to be shaken.
To hammer on the fuel, the good old "pyrotouch kompactor" came off the shelve and was redesigned, losely based on "the cam hammer design of Leonado da Vinci".
Also to achieve some effect the hammer has to beat on solids. So far we could not achieve good results on a transparant fluffy standard flaming pyrolyse bed. We had to cover the flaming pyrolyse with always solid woodchips by letting the fuel dominate only possible by reducing the DriZzle tube to its absolute minimum of 84mm.
This resulted in sligtly worse gas than we usaly see with a dominant and flaming ember bed in a broad tube.
Also we had to design a sensor to detect too much charcoal rise inside the gasifier. Indeed the gasifier goes in suspension only at max temperature. The sensor triggers an auger that sits underneed the gasifier and that takes the overload of charcoal,at the same time also nails, stones and oder dirt and shovels it in a waist bin.
So this is in a nutshell the working of this Grateless gasifier. Enjoy the video but be aware that this is only just the very first test.
We am intending to fire the grateless regualary and only open it, after a 50 hours run. If we reach this 50 hours run; only then we can say this design is valid.
Luk Vanhauwaert
Pacal Kirchner
The inventors of the DriZzleR
Long time not beeing on the forum, because hard working on our new projects. "The grateless gasifiers". First is a standard DriZzleR, adapted for grateless gasifying, and the second is a grateless updraft. The latter beeing a totaly new project nor tested.
The downdraft DriZzleR, is so far finished, that we could preform a proof of concept test. We fired it up two day's ago and let it run undisturbed for 7 hours and something.
Normaly, the grate DriZzleR, after an operating time between 2 to 5 hours starts to show isues. Depending on the fuel the grate starts to block. Either from heavy ashloaden wood or from a mixture of ash and impurety's, (nails, stones clinker.....) The result of a partly blocked grate is, higher presure drop and lesser production of gas.
With a special designed grate, pyramidical, revolving or other, one could lenthen the operating time. In a small agsifier the easiest method chosen is shaking or turning the grate.
Our solution is eliminating the grate all together. Simply just removing the grate without side precautions was not the solution. I works well but ireulary. Sometimes after a short time, sometimes only after a longer time the uneven build up of charcoal give fuel flow isues. The easiest solution one think of at first, is an ash and charcoal auger remover, trigered by time, underpressure or temperature. That is a real pitty because a lot of good charcoal will be waisted.
Finaly we came up with a process we called, "The suspension principle". Again as in every gasifier, there is no such thing as a free lunch. To bring your gasifier in suspension, the gasifier must be in balance. DriZzleR tube diameter, suction and fuel feed have to be in a certain relation. When these three elements are in harmony then over time the gassed out wood desintegrate into the finest elements, comes in suspension with the gasstream and is evacuated together with the gas.
The non gasious are then filtered out in the cyclone and prefilter.
The gasifier runs continious, only fuel has to be delivered but no manual periodiacal clean out is needed. For best function the process has to be helped a little. When one pushes the fuel it generates inside the gasifier small shockwaves that gives off the exstra push to launch the internal clouds of ash. Same as a grate shaker taht blows off the ash and dust from the coal. Only here we have no grate to be shaken.
To hammer on the fuel, the good old "pyrotouch kompactor" came off the shelve and was redesigned, losely based on "the cam hammer design of Leonado da Vinci".
Also to achieve some effect the hammer has to beat on solids. So far we could not achieve good results on a transparant fluffy standard flaming pyrolyse bed. We had to cover the flaming pyrolyse with always solid woodchips by letting the fuel dominate only possible by reducing the DriZzle tube to its absolute minimum of 84mm.
This resulted in sligtly worse gas than we usaly see with a dominant and flaming ember bed in a broad tube.
Also we had to design a sensor to detect too much charcoal rise inside the gasifier. Indeed the gasifier goes in suspension only at max temperature. The sensor triggers an auger that sits underneed the gasifier and that takes the overload of charcoal,at the same time also nails, stones and oder dirt and shovels it in a waist bin.
So this is in a nutshell the working of this Grateless gasifier. Enjoy the video but be aware that this is only just the very first test.
We am intending to fire the grateless regualary and only open it, after a 50 hours run. If we reach this 50 hours run; only then we can say this design is valid.
Luk Vanhauwaert
Pacal Kirchner
The inventors of the DriZzleR