No task disperse air in the reactor so quickly that he could carry CO and H2 from the reactor core. Problem to disperse the air to obtain the temperature in the reactor, which can withstand the nozzle. It should be 900 - 1300 C. It can be more, but then it is necessary to increase the number of nozzles, reducing the diameter of the nozzle. Now we must reduce the diameter of the reactor to provide> 900 C throughout the reactor. When using a single nozzle, we have strong blow torch and do long to increase the area of red-hot coal, respectively, the internal combustion engine power. This leads to the killing of the nozzle. When one nozzle, the diameter of the reactor is not important, and the thinner the nozzle, the better, but lose overall efficiency of the gas generator. We have to do the fine coal. This increases the resistance to the gas generator. I do not like this approach and my ancestors.
Reducing the diameter of the reactor to the desired temperature, we increase the efficiency of the gasifier, while blowing speed below. Reasonable but not below 900-1300 C throughout the reactor cross section. The minimum velocity in the reactor of 0.6 m / sec. The maximum speed in the reactor was 3.5 m / s, when the coal is rotten. In this range, the level of CO and CO2 is not changed. CO => 30%. CO2 <5%. Making the temperature no longer makes sense, if you do not adjust its limit supply of H2O. This increases the efficiency of the gas generator, but it is necessary to clearly monitor the temperature in the reactor. The reactor in hell, the whole diameter. Sleep is impossible. Use negative feedback on the exhaust gas. You will be able to relax, but not enough.
Direct gasifier. The amount of CO and CO2 in the reactor by sucking speed of the engine.
Power hp = 7 (3600 (r / min.) V = 2 (l / sec.)).
The air speed in the nozzle should be = 25 m / sec.
Reactor D = 55 mm.
The volume of the gas generator gas = 0.7. The total amount in the mixer = 8 m.3 / h.
Velocity through the reactor ~ = 0.58 m / sec. (Good).
The walls of the reactor should be warmed. Coal small = (6-20) mm.
The engine develops good power when coal bunker short.
Science can not be fooled and low-power motors working with heavy losses and gas generators inclusive.
The trade-off is inevitable:
Since the reactor is filled with a porous carbon, filling volume depends on the size of coal, then we can safely make the reactor diameter => 70 mm. And can be 80 mm. You can increase the size of the coal (20-40) mm. and adding nozzle.
Formula: without changing the diameter of the reactor is possible to change the size of lumps of coal. Or vice versa. From one another in a linear dependence.
The gas generator is a direct coal gasification has a nozzle or multiple nozzles and a heat focus. He will never be able to match the performance characteristics of the horizontal gas generator. But it is easy, as our galoshes. Low-power motors 0.1-3 kW will work best on horizontal gazgena with two foci of heat. They need a lot of water to 1: 1 gas mixture. They are very small, less than a bucket as my Shoe. From them it is possible to blow up to 50 m / sec. + Nozzle with tungsten on the eyelids or the MiG 29 turbine blades.