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Ethylene full-flow superstructure model modeling method based on P-graph

A model modeling and superstructure technology, applied in chemical process analysis/design, instrumentation, chemical machine learning, etc., to achieve the effects of ensuring modeling accuracy, expanding search domain, and reducing complexity

Pending Publication Date: 2021-01-08
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, to provide a P-graph-based ethylene full-flow superstructure model modeling method, to simplify the complexity of the model by merging the problem screening equipment and associated process equipment in the model, through the hyperstructure The structure of the largest structure breaks the loop and at the same time ensures that the impact of the loop on the process is minimized to solve the contradiction between the logistics cycle and the stability of the P-graph algorithm

Method used

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  • Ethylene full-flow superstructure model modeling method based on P-graph
  • Ethylene full-flow superstructure model modeling method based on P-graph
  • Ethylene full-flow superstructure model modeling method based on P-graph

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Embodiment 1

[0077] In order to verify the effectiveness of the method, for an ethylene plant with oil refinery-ethylene co-production, there were 11 cracking furnaces before the co-production (N F =11), one of them is in standby. The ethylene plant uses naphtha (NAP, R 1 ), hydrogenated tail oil (HVGO, R 2 ), liquefied petroleum gas (LPG, R 3 ), cycle ethane (R 4 ) and C5 (R 5 ) as a cracking raw material to produce hydrogen (H2, P 1 ), methane (CH4,P 2 ), ethane (C2H6, P 3 ), ethylene (C2H4, P 4 ), propylene (C3H6, P 5 ), C4(P 6 ) and pyrolysis gasoline and diesel oil (C5+, (P 7 )) and other products.

[0078] Before co-production, the raw material distribution of the whole device is shown in Table 1. In this case, the lightening rate of raw materials can be calculated by applying formulas 9, 10, and 11, and the SPI is 3.405×10 4 year km 2 , the economic benefit is 51582$ / h.

[0079] Table 1. Working conditions before co-production

[0080]

[0081] According to the cal...

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Abstract

The invention discloses an ethylene full-process superstructure model building method based on a P-graph, and the method takes a process of converting straight-chain alkane into olefin as a target object to build a model, and comprises four parts of cracking, quenching, compressing and separating, wherein the quenching and compressing processes are simplified into an operation unit type node, ethane circulation existing in the process is subjected to loop opening, and based on the optimal and near suboptimal solution sets obtained by the P-graph algorithm, analysis is carried out. The ethylenefull-flow superstructure model based on the P-graph framework has the advantage that a series of suboptimal solutions can be obtained. In the modeling process, a method for screening related equipment in the complex industrial process is provided according to the characteristics of three-pass one-reverse and to-be-studied problems.

Description

technical field [0001] The invention belongs to the technical field of ethylene cracking, and in particular relates to a P-graph-based ethylene full-process superstructure model modeling method, referred to as PECMA (P-graph based ethylene cracking modeling and analysis method) method, which uses process knowledge to screen and delete models The equipment to be modeled is based on the idea of ​​limit to decycle the ethane cycle existing in the process, and based on the analysis of the optimal and near-suboptimal solution sets obtained by the P-graph algorithm, the ethylene production unit under the requirements of refining and chemical integration is obtained. The optimal proportion of light raw materials. Background technique [0002] my country's ethylene production faces the problems of heavy cracking raw materials, high energy consumption and long-term shortage of cracking raw materials. At the same time, due to the adjustment of my country's economic structure, oil refi...

Claims

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Application Information

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IPC IPC(8): G16C10/00G16C20/10G16C20/70
CPCG16C10/00G16C20/10G16C20/70
Inventor 牟鹏顾祥柏朱群雄耿志强韩永明贺彦林
Owner BEIJING UNIV OF CHEM TECH
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