Method for optimizing value of ethylene device

An optimization method and ethylene plant technology, applied in cracking, non-catalytic thermal cracking, petroleum industry, etc.

Active Publication Date: 2011-10-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large scale of this kind of ethylene plant has led to the economic separation of valuable by-products, the price difference between main and by-prod

Method used

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  • Method for optimizing value of ethylene device
  • Method for optimizing value of ethylene device
  • Method for optimizing value of ethylene device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Taking the design scheme of 1 million tons of ethylene project as an example, adopting scheme 1, considering that the operating cost remains unchanged, let the total income = product sales income - raw material cost - fuel cost - separation cost + steam income, and calculate the maximum total income under the scheme The optimal operating conditions and the total income of the pyrolysis process.

[0096] Tianjin 1 million tons of ethylene design scheme adopted SL-I type cracking furnace (100,000 tons / year), sequential separation process, and selected two types of naphtha (1.112 million tons of naphtha 1# + 357,300 tons of naphtha 2#) and a hydrogenated tail oil (1.2234 million tons) as the main raw materials. The ethane and propane produced by cracking are recycled. During the calculation, the dry gas portion of the refinery is not considered.

[0097] First build the sample. The physical properties of the three cracking raw materials used in the ethylene design schem...

Embodiment 2

[0116] Taking the design scheme of the 1 million tons of ethylene project as an example, using scheme 2, let the total product income = ∑ (yield of various cracking products × corresponding product price) - raw material price, and calculate the maximum income under the scheme of maximum total product income Optimal operating conditions and the total income of the pyrolysis process.

[0117] First build the sample. The physical properties of the three cracking raw materials used in the ethylene design scheme are collected, and their physical properties are shown in Table 1; the cracking experiments of the three raw materials under different process conditions are respectively carried out in the cracking simulation experimental device, and the product yield is calculated; For the price system of ethylene feasibility study stage, see price 3 in price data table 5. The sample database is composed of the physical properties of cracking raw materials, thermal cracking process condi...

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Abstract

The invention belongs to the field of chemical reaction engineering and particularly relates to a method for optimizing the operation of an ethylene cracking device. In the method provided by the invention, value maximization is utilized as a scale and the operation optimization scheme of a cracking furnace is formulated aiming at the constitution and market price of different raw materials and the process characteristics of the device by virtue of establishing a yield prediction model, a value prediction model and a value optimization model. After the optimization scheme provided by the invention is adopted, the optimal cracking temperature is lower than the cracking temperature obtained by the optimization scheme which is formulated by the maximum yield of principal products such as ethylene and the like; the operating period of the device is effectively prolonged; the decoking cost is lower; the separation energy consumption is reduced; the potential of the processing capability of the device is further enhanced; and the highest economic benefits are simultaneously obtained.

Description

technical field [0001] The invention belongs to the field of chemical reaction engineering, relates to ethylene industrial cracking technology, and more specifically relates to a method for optimizing the operation of an ethylene cracking device. Background technique [0002] The ethylene industry is the leader and foundation of petrochemical industry, and has always been used as a symbol to measure the development level of a country's petrochemical industry. Therefore, improving the economic benefits of ethylene plants plays a decisive role in enhancing the market competitiveness of the entire petrochemical enterprise. At present, 99% of the world's ethylene is produced by thermal cracking / steam cracking through tubular cracking furnaces, and ethylene is basically produced in this way in my country. In the process of thermal cracking / steam cracking to produce ethylene, the cracking furnace is the core equipment of the unit, and the degree of optimization of its operating c...

Claims

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Application Information

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IPC IPC(8): G05B13/04C10G9/20
Inventor 王国清张勇郭莹张兆斌张利军杜志国李东风李晓峰
Owner CHINA PETROLEUM & CHEM CORP
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