NOVELTY - Multiple air distributors (50) are attached to an air distribution plate (55). Each of the air distributors is provided with a base (60) and a distribution arm (65) having distributor orifices. The distribution arm is located about parallel to the air distribution plate, and is provided with a bottom side in which the distributor orifices are arranged. The air distribution system is submerged in the fluidized bed so as to provide air to the bed materials.    USE - Air distribution system for reactor located in pyrolysis and gasification system for producing synthesis gas and bio-char from biomass feedstock (all claimed) such as cotton gin trash, sorghum, sludge, straw and rye.    ADVANTAGE - The distributor orifices are located on the bottom side of distribution arm to facilitate the air in preventing the bed materials from entering distributor orifices and reducing flow through air distributor or plugging air distributor i.e., plugging the flow of air out of air distributor. The Air distributor can have any suitable number of distributor orifices for fluidizing the bed materials. Two cyclones maximize capture of the solid by-product from pyrolysis and gasification system. The char is removed prior to the use of the syngas to prevent slagging and fouling in downstream conveying surfaces, thus the cyclone assembly removes the char from the gas exiting reactor. A cyclone top flange facilitates attachment of cyclone duct to low-energy cyclone because the opening at low-energy cyclone top has a wider diameter than the opening into cyclone duct. The cyclones is designed for the removal of sufficient char prior to burning the cleaned gas in order to minimize slagging and fouling when the low calorific value (LCV) gas that is burned. The cyclones are operated at about the temperature of the gas leaving reactor and are constructed of refractory material and are fitted with an air-tight rotary air lock to remove the captured char without allowing oxygen to contact the LCV gas, thus the char is conveyed by an auger out of the system continuously without affecting operation.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) flow measurement device; and    (2) cyclone assembly for removing char from gas produced from biomass feedstock.    DESCRIPTION OF DRAWING(S) - The drawing shows a side perspective view of an air distribution system.    Air distribution system (45)    Air distributor (50)    Air distribution plate (55)    Air distributor base (60)    Distribution arm (65)