Tone, I’ll start by answering the easiest question. About removing moisture. The hopper is hot, water and resin are in the form of steam. The lid must be cold so that the water can condence and flow into the chute for disposal outside the hopper. Not only does resin condense on the lid in addition to water, but cooling this lid is not easy if it is hidden somewhere under the body of the car, or in a niche in the trunk, or somewhere else. But the resin may not want to all drain away along with the water, and then the lid, sooner or later, will inevitably have to be cleaned. What’s also bad about this lid is that moisture and resin condense, but along with them, hot gas touches the cold lid, which is not able to condense at this temperature of the lid. For example, hydrogen, CO, CO2 and methane will generally refuse to condense in such unsuitable conditions! But the heat, many, many BTUs they will bring with them and transfer to this lid. In order to lower its temperature, with such increased heating, for the successful condensation of water, and the same resin (which we would like not to accumulate there, on the lid!), we will have to release these BTUs into the atmosphere to heat the crows…
Wisdom from the mouth of Steve Unruh tells us: “Let NO BTUs Escape, Free, Unchained, Unused!”
I still can’t imagine how to take heat away from this lid in order to return it to the reaction, and even in cramped space with a hidden placement of a wood gas generator.
Therefore, my monorator will be external, the bunker will be thermally insulated, including the loading hatches, and the flow of smoke will be forcibly drawn in by an auger from the bottom of the bunker and drained out into the upper part of the bunker. The outer surface of the monorator pipe will be blown with cold air from the turbine and, after heating, supplied for further heating to the hotter zones of the reactor.
Now about the sizes of wood gas generators. They are usually tied to specific wood gasifier designs. I selected the approximate dimensions for this gasifier from the maximum firewood consumption of 21 kg per hour. Again Imbert’s table. And even here I couldn’t resist and, instead of the recommended tuyere belt, I chose a central nozzle, like Rybnikov’s. I did this so that my first gasifier could immediately produce combustible gas. At least within the limits of consumption as in the 2nd line of the Imbert table for these reactor sizes: minimum gas flow rate is 5 cubic meters per hour, maximum gas flow rate is 44 cubic meters per hour. And there are plans to make it convert 50 kg of firewood per hour! And remain safe and sound.
Just to have a working gasifier right away, here and now. To have something to heat tea or coffee with, in order to calmly survive possible errors with the “gasifier of the future.” Which, by the way, does not have a throat at all, and the only calculated parameter is the size of the wood pieces no more than 5cm5cm5cm. Only so that they can be pushed by a screw in a pipe with a diameter of no more than 15 cm!
Everything else is planned not on the basis of someone’s size and design, but on the basis of the needs of the gasification reaction itself. “Get your zones temperatures UP; and kept UP - and the chemical changes will take care of themselves.”
The temperature of the coal bed must be high enough to decompose tars and carbon dioxide, but not too high so as to destroy the gasifier. “Take care of the char bed and the char bed will take care of you.”
The fuel feed must correspond to the gas consumption, and not to how many kilograms of firewood could fall into the air blast zone. Those. fuel must be supplied deliberately, as in injection cars.
The narrowing zone in the neck is needed, as far as I could understand, primarily to increase the temperature and sufficient density so that reactions take place with all the smokes components passing through this zone. Moreover, the density here should be high enough so that none of the molecules leave deprived of high temperature, and at the same time, the density of this zone should not be too high so as not to create a plug for passing gases. Those, this parameter also needs to be adjusted. And gas consumption is also a very important parameter here. The density of this zone will be maintained by a brainy algorithm for controlling the auger feeding wood pieces.
In any case, that’s the plan. How it will actually be, what difficulties will still have to be faced, what solutions will be found - all this is still to come!
The main idea is to replace the geometric dimensions of gasifiers of various capacities with several software and hardware regulators of various parameters in separate zones of the reactor, and to derive the necessary patterns for stable operation in different modes.
People solved absolutely the same problem when a gasoline carburetor, which was highly dependent on air flow, was replaced with tables for fuel supply and spark formation in injection systems. The process has become very stable, the problems of inconsistency in transition regimes have disappeared forever. And reliability has increased due to self-diagnosis of sensors and actuators. To do this using mechanics alone is a very difficult task.
I really enjoy discussing these ideas. Every time there are some additions to the already invented solutions. For example, the original idea of igniting a gasifier using pre-pumped gas into a cylinder will not only cope with the transient conditions of the gasifier, but even maintain its full functionality with zero gas consumption! Those, it will be able to operate steadily from 0% to 100% of its output without losing its temperature and coal.
Here is a rough sketch of what I talk about so much (and there is already something to add):
11 kWh of electrical energy - this will be the nominal mode. The maximum mode will be 22 kWh of electricity. Moreover, for an electric generator this will be its rated power. Thus, we will have a constant 2-fold power reserve without compromising the insulation of the windings and other parts of the generator.
Why then the gas consumption of 100 cubic meters per hour? The mini-CHP will produce heat, electricity, and purified gas for external consumers under an excess pressure of, say, 0.1 bar. For gas heating boiler, for gas cooker, for gas water heater, etc. Maybe for an old gas lamp?