Simulation Design Of Syngas Directly Synthesis Dimethyl Ether In Slurry-Bed Reactor With Annual Output Of 100,000t

Dimethyl ether synthesis form N2-containing syngas is a slurry reactor with annual output of 100,000t was simulated in this paper. Carbon monoxide and carbon dioxide hydrogenation methanol, and methanol dehydrogenation to DME are selected as independent reactions. The modal of slurry-bed reactor was developed based on hyperbolic reaction kinetics. Smith method for axial concentration distribution of particles for non-aqueous system was applied to calculate the axial catalyst particles profile. The reactor height, total carbon conversion, DME selectivity, axial profile of catalyst particles were investigated under different operating conditions. The results showed that the reaction temperature of the slurry-bed reaction is uniform due to the use of medical wax as heat-carrier. The axial distribution of catalyst particles along the reactor was uneven for the influence of gravity. The proper design conditions are temperature 240-250℃, pressure 5-6MPa and 2.6m reactor diameter. Since the DME synthesis is strong exothermic, five sets of heat exchange rube were placed in the reactor, which were 8m long,250 tubes with the diameter ofφ25×2.0mm. Water flows in the tubes at a velocity of 82.5kg/s, and temperature rise is 120℃to 200℃under 4MPa pressure.