Ethylene cracking furnace group load distribution optimization method

Abstract

The invention relates to an ethylene cracking furnace group load distribution optimization method. Data such as product yield are acquired by the aid of a mechanism model of cracking reaction, so that a key product yield neural network model of a cracking reaction process is built. Based on a theoretical method, a waste heat boiler outlet temperature prediction model is introduced. According to industrial operation data, parameters of the models are evaluated and corrected. Finally, based on a process model, a nonlinear optimization model taking ethylene output, diene output, high added output, ethylene value, diene value and high added value as goals, taking cracking furnace process parameters as equality constraints and taking waste heat boiler outlet temperatures as inequality constraints and other constraints is built and solved by the aid of an intelligent differential evolution algorithm. Application of a practical industrial device indicates that economic benefit can be remarkably improved by load optimal distribution. The method is theoretically simplified, reasonable in derivation, high in engineering usability, simple, easy to transplant and wide in adaptability.

Description

technical field [0001] The invention relates to an optimization method for load distribution of ethylene cracking furnace groups. technical background [0002] 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. This furna...

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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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