The invention relates to a
reaction system and method for preparing
ethylene by using a
slurry bed reactor. The
system comprises the
slurry bed reactor, a condenser, a condensation separator, a
solvent pump, a
solvent mixing tank, a
solvent temperature control system, filter equipment, a green oil removing
system, a high-temperature heating device and a catalyst reduction device, wherein the solvent
temperature control system comprises a heater, a solvent bypass and a cooler; the solvent
mixing tank communicates with the
slurry bed reactor; the filter equipment communicates with the slurry bed reactor; the condenser communicates with the slurry bed reactor; the solvent
temperature control system communicates with the slurry bed reactor; the condenser, the condensation separator and the solvent
mixing tank communicate with one another successively; the solvent mixing tank, the solvent pump and the solvent temperature
control system communicate with one another successively; the filter equipment, the high-temperature heating device, the catalyst reducing device and the solvent mixing tank communicate with one another successively; and the filter equipment, the green oil removing system and the solvent mixing tank communicate with one another successively. By the
reaction system and method, the problems that heat inside prepared
ethylene cannot be transferred out easily, and the
utilization rate of a catalyst is low can be solved effectively.