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裂解催化再生模拟

Conclusions
-- Barracuda's CPFD numerical method is capable of simulating large process units in full 3D with true PSD and chemical reactions, either catalytic or solids consuming
-- Its speed and accuracy enable long simulation times to be obtained for quantifying the quasi-steady fluidization behavior
-- Operational issues are revealed:
‣ The spent -at return line's curvature produces separation of the gas and solid flows, causing a very 'skewed' behavior
‣ This leads to poor gas-solids mixing, and low regeneration
‣ even worse, this maldistribution produces high-speed particles which cause excessive wear on the outside of some cyclone diplegs
‣ returning catalyst is quickly 'ejected' into the freeboard region where it is likely to promote severe 'afterburn'
‣ catalyst exiting some primary cyclone diplegs can be shortcircuited directly into the standpipe


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