Method for removing cleavage rupture membrane for decoking and oil removal on surface of Alfalava plate heat exchanger

Abstract

The invention belongs to the field of maintenance and cleaning in the refining industry, and discloses a method for removing a cleavage rupture membrane for decoking and oil removal on the surface ofan Alfalava plate heat exchanger. The method comprises the following steps: after a plate heat exchanger is switched, a plate heat exchanger body does not need to be opened, and a centrifugal pump anda closed stainless steel reactor are made through a connecting pipeline and 316L stainless steel under the condition of no disassembly to form a closed operation system; after the closed operation system is connected with the plate heat exchanger, a set of plate heat exchanger-plate heat exchanger external circulation closed operation reaction system is formed; a plurality of plant enzyme reactants are used as carriers, and the plant enzyme reactants react on the surface of a spiral body structure in the plate heat exchanger to generate a continuous cleavage rupture membrane; and under the physical crushing effect, coke scale is changed into small-particle powder, the closed reaction system continuously circulates, and the crushed coke scale powder and asphaltene scale are brought out ofthe plate heat exchanger to complete decoking and scale removal. According to the method, equipment damage cannot be caused, toxic and harmful gas, liquid and solid which are harmful to a human body cannot be generated, emission cannot generate adverse effects on the environment, and natural degradation can be realized.

Description

technical field [0001] The invention belongs to the field of maintenance and cleaning in the refinery industry, in particular to the cleaning of oil coke mixed dirt on the surface of plate heat exchangers in the refinery industry. Background technique [0002] The Swedish Alfalava (Alfa Laval) multinational company put into use the spiral plate heat exchanger (hereinafter referred to as the plate heat exchanger) in the domestic refinery industry fluidized bed residue hydrocracking unit. The reason is that equipment fouling and clogging often occur within 1-3 months, which seriously threatens and affects the smooth operation of the ebullated bed hydrocracking unit. [0003] At present, there are documents disclosing that when the Alfalava plate heat exchanger is used in a continuous reforming unit, the cleaning method used is chemical cleaning, using Na2CO3 cleaning, but it also has shortcomings, and it is prone to alkali embrittlement. At present, it is tried to use organic ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of severe coking and clogging after the use of the Alfalava plate heat exchanger, and to provide a method for solving the problem of cleavage and bursting membranes for cleaning coke and oil on the surface of the Alfalava plate heat exchanger, and at the same time effectively achieve the following two purposes :

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