Fluidized bed generator for allothermic gasification of coal

A fluidized bed gas generator comprising:

• a horizontal cylindrical elongated pressure tank, said tank having a horizontal axis, a cylindrical wall and being provided with a gas outlet at one end of said tank, said tank comprising:
• a pyrolysis zone in an upstream area of said tank at an opposite end of the tank,
• a gasification zone located adjacent but downstream from said pyrolysis zone at an intermediate region of the tank between said ends, and
• a cooling zone located adjacent but downstream of said gasification zone at said one end of said tank;
• a coal-supply pipe leading into a bottom of said pyrolysis zone for supplying coal dust to said pyrolysis zone at said bottom of said pyrolysis zone as transported with a gas;
• a steam supply pipe connection leading into said gasification zone and having means for distributing steam from a series of orifices therein;
• a further steam supply connection leading into said cooling zone and having means for distributing steam from a series of orifices therein;
• an evacuation sluice leading from said cooling zone;
• a vertical dam impermeable to gas and solids extending from the bottom of the tank perpendicular to said axis separating said gasification zone from said pyrolysis zone and having a horizontal edge below a top of said tank;
• a further vertical dam impermeable to gas and solids extending from the bottom of the tank perpendicular to said axis separating said gasification and cooling zones and having a horizontal edge below a top of said tank, first heat-exchange tubes in said gasification zone connected to said top of said tank and reaching below said horizontal edges;
• further heat-exchange tubes in said pyrolysis zone connected to said top of said tank and reaching below said horizontal edge of said further vertical dam;
• a heat-transfer gas connection for supplying a heat-transfer gas to said first heat-exchange tubes at said top of said tank;
• and
• means at said top of said tank for connecting said first heat-exchange tubes with said further heat-exchange tubes, said coal dust being pyrolyzed in said pyrolysis zone and gasified in said gasification zone whereby a product gas is discharged from said outlet.