NOVELTY - Mixture containing activated fossil fuel, aqueous sodium hydroxide and promoter, is combusted with oxidant, carbon dioxide (CO2) absorbent and processed in gasification-CO2 fixation zone to form mixture (G1) of CO2, methane, hydrogen and water vapor. CO2 in mixture (G1) is separated by fixation using absorbent, and water vapor in the resulting mixture is liquefied to manufacture high calorie gas.    USE - Used as alternative for petroleum, heavy oil and coal which are commonly used as energy source.    ADVANTAGE - The manufacture method enables efficient and continuous production of high calorie gas, by a simple process. The method recovers carbon dioxide by fixation based on critical point difference, and thereby prevents release of carbon dioxide into the atmosphere. The heat from combustion and gasification-carbon dioxide fixation zones are recycled to raw material processing zone, hence the apparatus used for high calorie gas manufacture excels in thermal efficiency and is small-sized.    DETAILED DESCRIPTION - Mixture containing activated fossil fuel is formed by processing raw material (16) comprising fossil fuel containing sulfur, aqueous sodium hydroxide and gasification promoter, at 200-500 degrees C in processing zone (12) of reactor vessel (10) which is previously maintained at 7-25 MPa. The processed mixture containing activated fossil fuel is partially combusted in combustion zone (13) of vessel at 800-1200 degrees C. The combusted gas is processed in gasification-carbon dioxide fixation zone (14) at 1200-500 degrees C, and gaseous mixture (G1) comprising carbon dioxide, methane, hydrogen and water vapor is generated. Carbon dioxide in gas mixture (G1) is fixed by the absorber (22), and reaction product comprising carbon dioxide absorber, and gaseous mixture (G2) of methane, hydrogen and water vapor, is ejected from the discharge port (24) of the reactor vessel. The carbon dioxide absorber in reaction product is separated from gaseous mixture (G2) by solid-gas separator (36). Water vapor in separated gaseous mixture (G2), is liquefied by cooling mixture to 50-150 degrees C and high calorie gas comprising methane and hydrogen is manufactured.    An INDEPENDENT CLAIM is also included for high calorie gas manufacturing apparatus.    DESCRIPTION OF DRAWING(S) - The figure shows the block diagram of high calorie gas manufacturing apparatus.(Drawing includes non-English language text).    Reactor vessel (10)    Processing zone (12)    Combustion zone (13)    Gasification-carbon dioxide fixation zone (14)    Raw material (16)    Carbon dioxide absorber (22)    Discharge port (24)    Solid-gas separator (36)