Method and system for optimizing top cycle oil flow rate of catalytic cracking fractionating tower during gasoline and diesel cutting process

Abstract

The invention relates to a method for optimizing a top cycle oil flow rate of a catalytic cracking fractionating tower during a gasoline and diesel cutting process. According to the method, in order to improve the gasoline yield, a catalytic cracking fractionating tower dynamic model is established by utilizing an SIMIT simulation framework, and a distributed control system simulator is established. If an actually measured crude gasoline endpoint is less than a process card crude required value and exceeds a first predetermined value, operating parameters of the current fractionating tower areinput into the catalytic cracking fractionating tower dynamic model by means of the distributed control system simulator, so as to obtain a simulated crude gasoline endpoint and compare the simulatedcrude gasoline endpoint with the process card required endpoint, if the simulated crude gasoline endpoint is lower than the process card required endpoint and exceeds the first predetermined value, the top cycle oil flow rate in the operating parameters is increased by step-length, so as to update the simulated crude gasoline endpoint, the steps are circulated till the updated simulated crude gasoline endpoint is lower than the required endpoint and does not exceed the first predetermined value, thus the optimized cycle oil flow rate is obtained, and the optimized cycle oil flow rate is output.

Description

Technical field [0001] The invention relates to the field of petrochemical process optimization, in particular to a method and a system for optimizing the top circulating oil flow of a catalytic cracking fractionation tower in a gasoline and diesel cutting process. Background technique [0002] In the production of a catalytic cracking unit, the operating level and technical level of the fractionation tower directly affect the economic benefits of the entire unit. To study the optimal design of the catalytic cracking processing unit, the optimization of the fractionation system is very important. The method of controlling the dry point of crude gasoline by adjusting the flow rate of the top cycle oil in the catalytic fractionation column is non-real-time, delayed and usually based on experience. In the actual production process of a catalytic cracking unit, the cutting of gasoline and diesel is often a conservative operation based on experience. For example, the general gasolin...

AI Technical Summary

Problems solved by technology

The problem in actual production is that if you want to increase the dry point of gasoline, you need to increase the top cycle oil flow

If the flow rate is increased too much, it will cause the gasoline dry point to exceed the standard

The flow increase is too small to meet the requirements of improving efficiency

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