Fluidized bed separation method and device for methanol-to-olefins quenched water

A fluidized bed based separation device for methanol-to-olefins quench water, comprising:

• a quench tower,
• a microcyclone separator in communication with the quench tower for liquid-solid separation of quench water to remove large particles entrained in the quench water;
• a fluidized bed separator in communication with the microcyclone separator for secondary separation of supernate from the microcyclone separator to remove residual particles in the quench water;
• an olefin separation unit as a low-temperature heat source which receives the quench water;
• and
• a pressure filtration unit in communication with the fluidized bed separator for dewatering concentrated catalyst slurries separated from the microcyclone separator and the catalyst slurries concentrated from the fluidized bed separator by pressure filtration to recover the catalyst,
• wherein the device further comprises:
• a fluidized bed reactor for reacting a methanol raw material therein;
• the quench tower in communication with the fluidized bed reactor for washing and cooling a product gas obtained by the reaction in the fluidized bed reactor after large catalyst particles are removed, while washing fine catalyst powder entrained in the product gas into the quench water;
• a water washing tower in communication with the quench tower for washing and recooling the product gas washed and cooled by the quench tower, and removing oil-wax substances condensed in the product gas;
• and
• a stripping tower in communication with the water washing tower for stripping a portion of washing water obtained by the washing in the water washing tower;
• wherein the stripping tower is communicated with the fluidized bed separator, and water for regeneration of a separating medium in the fluidized bed separator is purified water from the stripping tower.