Concentrated solar heat receiver, reactor, and heater

A reaction apparatus comprising:

• a heat receiver of concentrated solar radiation comprising:
• a side portion having an inner wall, said inner wall absorbing solar light;
• a bottom portion connected to a lower end of the side portion;
• a ceiling connected to an upper end of the side portion;
• an aperture provided in the ceiling;
• and
• a reflector provided on the bottom portion inside the receiver, said reflector reflecting the solar light toward the inner wall of the side portion;
• and
• a reactor arranged around the heat receiver with a predetermined distance from the heat receiver in a manner covering the side and bottom portions of the heat receiver, said reactor containing:
• a fluidized bed;
• and
• a draft tube submerged in the fluidized bed,
• wherein the heat receiver has a cavity defined by the side portion, the bottom portion and the ceiling,
• the aperture connects to a portion of the cavity, and
• the reflector has a conical shape that protrudes from the bottom portion.