NOVELTY - The hydrogen/syngas generator comprises three concentric shells, innermost shell, middle shell, outer most shell, a sampling port (8) for measuring gas formed from medium temperature/ high temperature water gas shift (MTS/HTS) reactor and low temperature water gas shift after a preferential oxidation reactor (PROX) and an inlet and outlet for coolant/carbon monoxide and carbon dioxide absorption solution, reactor sections, and coils (1) for supplying steam to auto thermal reforming (ATR) feed preheating section, cooling product gas and absorbing carbon monoxide and carbon dioxide.    USE - The hydrogen/syngas generator or fuel processor is useful for producing hydrogen rich gas, which is useful to fuel cell or syngas feeding applications.    ADVANTAGE - The hydrogen/syngas generator is compact, can be easily and economically produced with high thermal efficiency, improved performance and reduced size, and efficiently generates three moles of syngas without using external heating.    DETAILED DESCRIPTION - The hydrogen/syngas generator comprises three concentric shells, innermost shell, middle shell, outer most shell, a sampling port (8) for measuring gas formed from medium temperature/high temperature water gas shift (MTS/HTS) reactor and low temperature water gas shift after a preferential oxidation reactor (PROX) and an inlet and outlet for coolant/carbon monoxide and carbon dioxide absorption solution, reactor sections, and coils (1) for supplying steam to auto thermal reforming (ATR) feed preheating section, cooling product gas and absorbing carbon monoxide and carbon dioxide from hydrogen rich product gas. The innermost shell consists of an auto thermal reforming reactor, which comprises a port (6) for mixing steam with fuel and air through a fuel entry port (7a), an air entry port (7b) and a water entry part (7c). The middle shell comprises of a low temperature water gas shift (LTS WGS) reactor in upper section, a medium temperature/ high temperature water gas shift (MTS/ HTS WGS) reactor in lower section, and a steam coil placed in between the inner shell and the middle shell. A sparger (3) is placed at an inlet of medium temperature/ high temperature reactor. The outer most shell comprises the preferential oxidation reactor that is placed in upper section, a condenser with carbon monoxide and carbon dioxide clean up in middle section, a gas liquid separator in lower section, a condenser coil (2) between middle shell and outer most shell, and an air sparger (4) at an inlet of preferential oxidation reactor. The reactor sections consist of desulfurizer, auto-thermal reactor, water gas shift reactors, preferential oxidation reactor, methanation reactors, carbon monoxide and carbon dioxide absorber thermally integrated as a single, and concentric unit. The preferential oxidation reactor is replaced or used in combination with methanation reactor. The generator parts are constructed of metal, ceramic, refractory type, plastic, wood or a composite material. The gas generator: comprises a combination of chemical reactions that thermally balance to give a thermoneutral or exothermic fuel generator along with desulfurizer, condenser, separator, and carbon monoxide/carbon dioxide absorption; and combines reactions consisting of partial oxidation (PO), partial oxidation+steam reforming (SR), PO+SR+dry reforming (DR), PO+DR, PO+SR+DR+water gas shift, PO+SR+DR+water gas shift+preferential oxidation reactor and PO+water gas shift. An INDEPENDENT CLAIM is included for a process for the preparation of hydrogen gas/syngas in a generator.    DESCRIPTION OF DRAWING(S) - The diagram shows a fuel processor or hydrogen/syngas generator.    Steam coil (1)    Condenser coil (2)    Sparger (3)    Air sparger (4)    Port (6)    Fuel entry port (7a)    Air entry port (7b)    Water entry port (7c)    Sampling port. (8)