Double fluidized bed reactor system including staircase-type helical blade

A double fluidized bed reactor system comprising a staircase-type helical blade, the double fluidized bed reactor system comprising:

• a fuel tank configured to store fuel;
• a bubbling fluidized bed gasification furnace configured to receive the fuel from the fuel tank and steam from a lower portion thereof, to form a bubbling fluidized bed through a flow of flow medium therein, and to gasify the fuel, thereby generating a resultant gas;
• a high-speed fluidized bed combustion furnace configured to receive the flow medium and char contained in the resultant gas from the bubbling fluidized bed gasification furnace, additionally receive air, to combust the char so as to heat the flow medium, and to transfer the heated flow medium back to the bubbling fluidized bed gasification furnace;
• a resultant gas cyclone communicating with the bubbling fluidized bed gasification furnace, and configured to separate fine particles from the resultant gas discharged from the bubbling fluidized bed gasification furnace and to introduce the fine particles back to the bubbling fluidized bed gasification furnace and to discharge a remaining part of the resultant gas;
• and
• an exhaust gas cyclone connected to both an upper portion of the high-speed fluidized bed combustion furnace and an upper portion of the bubbling fluidized bed gasification furnace while being located therebetween, and after separating the flow medium from the exhaust gas, discharging the exhaust gas and transferring the flow medium to the bubbling fluidized bed gasification furnace,
• wherein the bubbling fluidized bed gasification furnace comprises:
• a center rod located inside the bubbling fluidized bed gasification furnace in a vertical direction along a center portion thereof;
• and a helical blade configured to move the resultant gas and the steam as a vortex along the center rod,
• the helical blade comprises a plurality of unit blades radially coupled to the center rod, and respective unit blades are spaced apart from each other and arranged in a staircase type,
• a section of each of the unit blades, the section being perpendicular to a surface formed by a center shaft of the center rod and a longitudinal shaft of the unit blade, is a polygon, and
• some of the exhaust gas discharged from the exhaust gas cyclone is de-oxygenated through a low temperature oxidation catalyst and then supplied into the fuel tank.