NOVELTY - Apparatus for producing combustible gases from biomass feeds comprises outer cylindrical structure (101) having tapered top (104); inner cylindrical structure (105) enclosed by outer structure (101); feed inlet (107) positioned at bottom of structure (101); air inlet pipe (121); and waste collection assembly; where air passage allows cyclonic vortex of mixture of air and biomass feeds to swirl upwards and upon reaching tapered top to discharge ash into waste chamber, and driving the produced combustible gases out of inner cylindrical structure through outlet pipe (108).    USE - For producing combustible gases comprising combination of carbon monoxide, hydrogen, methane, nitrogen, oxygen and carbon dioxide, from biomass.    ADVANTAGE - The apparatus is simple to operate with no moving parts to minimize maintenance. The apparatus allows longer residence time for the biomass feeds to enable complete gasification with less char and tar content of the product gas, where entrained flow is forced to swirl three times inside the apparatus at different swirling directions, increasing the residence time to allow wider range of acceptable size of biomass feed particles to be completely gasified. The apparatus provides effective control of temperature, pressure and air/fuel ratio to maintain consistently high calorific value of producer gas. The apparatus allows relatively coarser particle sizes of feedstock for gasification as compared to the fluidized-bed gasifier. The apparatus can combine operations for gasification and ash collection in single unit to keep away from installation of complex hot gas cleaning setups.    DETAILED DESCRIPTION - Apparatus for producing combustible gases from biomass feeds comprises outer cylindrical structure (101) having sidewall (102), bottom supporting base (103) and tapered top (104); inner cylindrical structure (105) is enclosed by outer cylindrical structure and having first opening at its top, sidewall (106) and base seated on bottom supporting base such that gap between sidewalls of cylindrical structure which forms air passage connecting to air chamber in the inner cylindrical structure through first opening; where air chamber is tapered towards second opening (109) at bottom of inner cylindrical structure; feed inlet (107) is positioned at bottom of outer cylindrical structure and connecting to air passage; air inlet pipe (121) having electromechanical actuator valve (120) and connected to feed inlet; outlet pipe (108) extending from tapered top (104) and connecting to upper portion of air chamber within the inner cylindrical structure; and waste collection assembly consisting of rotary valve (114) and waste chamber (115) connected to second opening (109); where air passage allows cyclonic vortex of mixture of air and biomass feeds to swirl upwards inside the outer cylindrical structure and downwards into the inner cylindrical structure upon reaching tapered top (104) to discharge ash through second opening into waste chamber, resulting in vortex to swirl upwards from tapered bottom of inner cylindrical structure, driving the produced combustible gases out of inner cylindrical structure through outlet pipe. The apparatus further comprises feeding system having biomass feedstock storage hopper (110), rotary feeder (111) joined to storage hopper and ejector (112) connected between rotary feeder and feed inlet (107) for injecting biomass feeds by high speed air from air inlet (121) into outer cylindrical structure (101) through the feed inlet; and cylindrical hollow casing (113) enclosing outer cylindrical structure (101) of with layer of heat insulating material. An INDEPENDENT CLAIM is included for producing combustible gases from biomass feeds involving developing cyclonic vortex of mixture of air and biomass feeds to swirl upwards in preheated outer cylindrical structure (101) and downwards into preheated inner cylindrical structure (105) when vortex reaches the tapered top (104) of outer cylindrical structure (101); where combustible gases are produced when biomass feeds collide with heated sidewalls (102, 106) of cylindrical structures (101, 105) at high speed; discharging ash separated from combustible gases produced under centrifugal force of the vortex into waste chamber (115), where vortex reverses in direction and swirls upwards inside inner cylindrical structure (105) upon discharge of ash through second opening (109); and releasing produced combustible gases out from apparatus through outlet pipe (108).    DESCRIPTION OF DRAWING(S) - The figure shows front view of apparatus.    Outer cylindrical structure (101)    Sidewall (102, 106)    Bottom supporting base (103)    Tapered top (104)    Inner cylindrical structure (105)    Feed inlet (107)    Outlet pipe (108)    Second opening (109)    Storage hopper (110)    Rotary feeder (111)    Cylindrical hollow casing (113)    Rotary valve (114)    Waste chamber (115)    Actuator valve (120)    Air inlet pipe (121)