Optimal Method for Load Distribution of Ethylene Cracking Furnace Group

Abstract

The invention relates to an optimization method for load distribution of ethylene cracking furnace groups. Using the mechanism model of the pyrolysis reaction, the product yield and other data were obtained, and a neural network model of the key product yield in the pyrolysis reaction process was established accordingly. Based on the theoretical method, a prediction model for the outlet temperature of the waste heat boiler is derived. According to the industrial operation data, the parameters of the above models are estimated and corrected. Finally, based on the process model, the ethylene production, diene production, high-additional production, ethylene value, diene value and high-attached value were established as the targets, with the process parameters of the cracking furnace as the equality constraints, and the waste heat boiler outlet temperature as the inequality constraints and Nonlinear optimization models for other constraints. The model is solved by intelligent differential evolution algorithm. The application to actual industrial installations shows that the optimal load distribution obtained by this method can significantly improve economic benefits. The method is theoretically simplified and deduced reasonably, has strong engineering applicability, is simple and easy to implement, easy to transplant, and has wide adaptability.

Description

technical field [0001] The invention relates to an optimization method for load distribution of ethylene cracking furnace groups. [0002] technical background [0003] The ethylene industry occupies the core position of the petrochemical industry, and the ethylene output is a symbol to measure the development level of a country's petrochemical industry, so the daily operation and optimization of the cracking furnace is very important. The ethylene cracking furnace is a device in which cracking raw materials flow through the cracking furnace tube at high speed and complex endothermic chemical reactions occur under the conditions of high temperature and short residence time. Due to the scale and enlargement of ethylene plants, it is difficult for a single cracking furnace to meet the needs and requirements of the industry. In large-scale ethylene production enterprises, a cracking furnace area of ​​an ethylene plant usually consists of dozens of ethylene cracking furnaces. Th...

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Problems solved by technology

Although this process will also consider the impact of the operating conditions of the cracking furnace, for example, at the end of the cracking furnace operation, due to the high outlet temperature of the waste heat boiler or TMT (maximum temperature on the furnace tube surface), the processing load of the cracking furnace will be adjusted. However, these adjustments are often highly subjective, and it is impossible to deeply and carefully evaluate the operating efficiency of each cracking furnace and the impact of changes in cracking raw materials and cracking load on the operating efficiency and benefits of the entire cracking device, etc.

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