Fluidized bed reactor and application thereof

The invention provides a fluidized bed reactor and application thereof. The fluidized bed reactor comprises a reactor main body with sealed top, at least one spiral-flow type gas-solid separator, and a gas guide pipe; the upper part at a straight tube zone of the spiral-flow type gas-solid separator is provided with at least two guiding air intake channels along the tangential direction, and the contour of each guiding air intake channel is a spiral curve. The fluidized bed reactor is capable of effectively reducing suspension concentration of a catalyst fine powder in a settlement space, timely transferring the catalyst fine powder generated in the reaction process out of the reaction system, avoiding accumulation of the catalyst fine powder in the fluidized bed reactor, and enabling the reaction apparatus to stably operate for a long time and obtain good and stable reaction effect. The spiral-flow type gas-solid separator in the fluidized bed reactor generates small wearing on a catalyst particle, and is capable of obviously reducing catalyst consumption and reducing operation cost of the apparatus especially when being used as a reactor for adsorption desulphurization.