1 INTRODUCTION Fuel industry is of increasing importance because of the rapidly growing energy needs worklwide.Many processes in fuel industry,e. G. Fluidized catalytic cracking(FCC)[1]，pyrolysis and hydrogena-tion of heavy oils [2],Fischer-Tropsch(FT) synthesis[3,4]，methanol and dimethyl ether(DME) synthesis[5,6]，are all carried out inmultiphase reactors. The reactors forthese processes are very large in scale. Unfortunately they are complicated in design andtheir scale-up is very difficult .Therefore more andmore attention has been paidtothis field . The abovementioned chemical reactors,in which we are especially involved like deep catalytic pyrolytic and one-step synthesis of dimethyl ether are focused on inthis paper.
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