Fluid dispersion equipment and method for large reactor

The invention discloses a fluid dispersion device and method for a large reactor. The fluid dispersion equipment comprises one or more fluid dispersion pipes, the fluid dispersion pipes are vertically mounted in the large reactor, the upper ends of the fluid dispersion pipes are feeding ends, and the lower ends of the fluid dispersion pipes are closed; a plurality of openings are distributed in the fluid dispersion pipe; and the openings are distributed at equal intervals in an up-down staggered manner in the circumferential direction of the fluid dispersion pipe. Fluid in a large reactor enters a circulating pump arranged outside the reactor through the bottom of the reactor, is pressurized through the circulating pump to enter a fluid dispersion pipe, is sprayed out at a high speed along openings distributed in the fluid dispersion pipe and then circulates back to the reactor. According to the invention, effective dispersion and mixing of materials in the reactor can be realized, the dispersion effect is go