Fluidized bed reactor, device and method for preparing low-carbon olefins from oxygen-containing compound

A fluidized bed reactor, comprising a reactor shell, a reaction zone, a coke control zone, and a delivery pipe;

• wherein the reactor shell comprises a lower shell and an upper shell, the lower shell encloses the reaction zone, the delivery pipe is disposed above the reaction zone and the delivery pipe is in communication with the reaction zone, an outer periphery of the delivery pipe is provided with the upper shell, the upper shell and the delivery pipe enclose to form a cavity comprising the coke control zone;
• an upper part of the delivery pipe is provided with a gas outlet;
• the reaction zone comprises a reaction raw material inlet and a coke controlled catalyst inlet;
• the coke control zone comprises a catalyst inlet, a coke controlled catalyst outlet, a coke control gas outlet, and a coke control raw material inlet;
• the coke control zone is an annular cavity;
• n baffles are arranged in the coke control zone, and the n baffles divide the coke control zone into n sub-coke control zones, the n sub-coke control zones comprise a first sub-coke control zone, a second sub-coke control zone, and an nth sub-coke control zone;
• at least one catalyst circulation hole is provided on each of n-1 of the n baffles so that a catalyst flows in an annular shape in the coke control zone, wherein n is an integer;
• and
• the catalyst inlet is arranged in the first sub-coke control zone, the coke controlled catalyst outlet is arranged in the nth sub-coke control zone, and the coke control gas outlet is arranged between two adjacent baffles of the n baffles.