NOVELTY - The entrained bed system comprises a first reactor comprising an inlet for receiving a carbonaceous material and air and for inducing a first swirl to the carbonaceous material and air, a heating module adapted to provide heat such that the first swirl-induced carbonaceous material is pyrolysed and subsequently undergo oxidation and reduction to produce a raw producer gas and a char, and a second reactor (11) adapted to receive the raw producer gas and the char and adapted to combust a portion of the raw producer gas to produce an amount of heat.    USE - The system is useful for producing a producer gas (claimed) from a carbonaceous material such as an agricultural residue (all claimed), fuel, biomass such as rice or paddy husk, paddy straw, sugar cane trash, bagasse, coir pith, groundnut shells and cotton stalks, coal or solid fossil fuel, where the producer gas includes syngas such as carbon monoxide and hydrogen, carbon dioxide, methane and few inerts and the system is an entrained bed system.    ADVANTAGE - The entrained bed system energy efficiently and rapidly produces the producer gas with improved calorific value and reduced contaminants, and prevents leakage of the producer gas thus increasing the safety.    DETAILED DESCRIPTION - The entrained bed system comprises a first reactor comprising an inlet for receiving a carbonaceous material and air and for inducing a first swirl to the carbonaceous material and air, a heating module adapted to provide heat such that the first swirl-induced carbonaceous material is pyrolysed and subsequently undergo oxidation and reduction to produce a raw producer gas and a char, and a second reactor (11) adapted to receive the raw producer gas and the char and adapted to combust a portion of the raw producer gas to produce an amount of heat for inducing a reduction reaction of the char to produce a resultant producer gas. The second reactor is further adapted to mix the raw producer gas and the char, and comprises: an inlet port (13) for receiving the raw producer gas and the char proximate to a first side end; a gas outlet (15) for discharging the resultant producer gas from the second reactor; an ash outlet (17) for discharging an ash generated from the reaction of the raw producer gas and the char at a second side end (21) that is opposite to first end; a radially inwardly disposed rotatable shaft comprising a member extending from the rotatable shaft towards a wall of the second reactor, which is rotatable for mixing the raw producer gas and the char; and oxidizer inlets for providing an oxidizer for combustion of the portion of the raw producer gas. The oxidizer inlets are positioned such that reaction zones are created inside the second reactor producing the respective amount of heat for inducing the reduction reaction of the char. The inlet port is present at the first side end of the second reactor, and the gas outlet and the ash outlet are present at the second side end of the second reactor. The oxidizer inlet is adapted to provide a sub-stoichometric amount of the oxidizer. An INDEPENDENT CLAIM is included for a method of producing a producer gas.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an entrained bed system.    Second reactor (11)    Inlet port of second reactor (13)    Gas outlet of second reactor (15)    Ash outlet of second reactor (17)    Second side end. (21)