Separation device and separation method for preventing coking at bottom of depropanization tower of catalytic gas fractionation device

Abstract

The invention provides a separation device for preventing coking at the bottom of a depropanization tower of a catalytic gas fractionation device. The separation device comprises a high-pressure depropanization tower and a low-pressure depropanization tower. An inlet pipeline is arranged in the middle of the high-pressure depropanization tower, a first tower top gas phase delivery pipeline is arranged at the top of the high-pressure depropanization tower, and a first tower top condenser and a first tower top reflux tank are sequentially arranged on the first tower top gas phase delivery pipeline in the gas phase flowing direction. A high-low-pressure double-tower depropanization process is adopted, hot water of 80-95 DEG C in a factory, waste heat of a low-temperature process material or low-pressure steam is adopted as a heat source at the tower bottom, so that the operation temperature of the tower bottom of the depropanization tower is effectively reduced, and the problem that the tower bottom of the depropanization tower is coked and blocked is fundamentally solved; the problems of reduced processing load and unplanned shutdown of the catalytic gas separation device caused by coking and blockage of the tower bottom of the depropanization tower are avoided; and meanwhile, the steam consumption at the bottom of the depropanization tower is reduced, and the energy consumption of the device is reduced.

Description

technical field [0001] The invention relates to a separation device for double-tower depropanization in a catalytic gas fractionation device, in particular to a separation device and a separation method for preventing coking at the bottom of a depropanizer in a catalytic gas fractionation device. Background technique [0002] The gas fractionation unit is a supporting production unit for catalytic cracking and catalytic cracking. The main purpose is to recover and separate propylene and propane products in catalytic liquefied gas (liquid hydrocarbon). Due to its high severity, catalytic cracking has higher propylene yield and butadiene content than conventional catalytic cracking units. Liquid hydrocarbons produced by catalytic cracking and catalytic cracking units are sent to the downstream gas fractionation unit for fractionation after being processed by the refining unit (alkali washing, desulfurization, and sweetening). [0003] Catalytic gas fractionation devices at ho...

AI Technical Summary

Problems solved by technology

Injecting a polymerization inhibitor can relieve the problem of coking and clogging at the bottom of the depropanizer to a certain extent, but it cannot fundamentally solve the problem of coking of butadiene polymerization in the reboiler at the bottom of the depropanizer, and the production and operation costs increase

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