Processing method for reducing energy consumption of catalytic device

Abstract

The invention relates to a processing method for reducing the energy consumption of a catalytic device, which comprises the following steps of: a, arranging a medium-oil overweight aromatic hydrocarbon heat exchanger on the outer side of a fractionating tower, arranging a desorption tower bottom material heat exchanger on the outer side of a desorption tower, and connecting the medium-oil overweight aromatic hydrocarbon heat exchanger with the fractionating tower through a pipeline, and connecting the desorption tower bottom material heat exchanger with the desorption tower through a pipeline;b, after circulating overweight aromatic hydrocarbon is pumped out, performing heat exchange on the circulating overweight aromatic hydrocarbon with first medium oil through a first medium oil overweight aromatic hydrocarbon heat exchanger, thus extracting high-level heat energy of the overweight aromatic hydrocarbon; and c, performing heat exchange on the heated medium oil with the material in the material heat exchanger at the bottom of the desorption tower according to the original process flow before entering the cooler at the bottom of the desorption tower, so that the consumption of theheating steam of the reboiler at the bottom of the desorption tower is reduced. According to the invention, the process flow is simple, the layout is reasonable, the operation is convenient, the heattaking efficiency is reasonable, and the economic benefits of companies are increased.

Description

technical field [0001] The invention relates to the field of catalytic cracking oil refining and processing, in particular to a processing method for reducing energy consumption of a catalytic device. Background technique [0002] Catalytic cracking is an important secondary processing technology in refineries, which plays an active role in the process of lightening heavy crude oil, but it also consumes a lot of energy while producing light fuel. The quality of the device's operating conditions directly affects the energy consumption level of the device, which in turn affects the comprehensive energy consumption and economic benefits of the refinery. Compared with the energy consumption of similar catalytic cracking units abroad, the energy consumption of catalytic cracking units in my country is generally higher. When the catalytic cracking unit is in full production according to the design, the temperature at the bottom of the fractionation tower in the catalytic fraction...

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Problems solved by technology

When the catalytic cracking unit is in full production according to the design, the temperature at the bottom of the fractionation tower in the catalytic fractionation system is higher than the upper limit of the control index of 350°C, and the super-heavy aromatics at the bottom of the tower are easy to coke, which is not good for the process operation and the long-term safe and stable operation of the equipment, and the tower as a whole Due to the large heat load, the processing capacity of the device is not up to standard, and the economic benefits of the enterprise are poor. However, the desorption tower in the downstream absorption stabilization device uses 1.0MPA steam as the heat source, which increases the energy consumption of the entire device and reduces the overall cost of the device. economic benefits

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