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Method for setting up mould of cracking reaction in ethylene cracking furance burning and reacting tube

A cracking reaction and ethylene cracking technology, which is used in hydrocarbon cracking to produce hydrocarbons, special data processing applications, instruments, etc. It can solve the problems of complex elementary reaction model, large amount of calculation, and narrow scope of application.

Inactive Publication Date: 2007-03-28
SINOPEC YANGZI PETROCHEM
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  • Abstract
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Problems solved by technology

[0008] (3) The elementary reaction model is too complex, including more than 3,500 reactions, and the amount of calculation is too large, while the empirical model is limited to limited operating conditions and raw material characteristics, and its scope of application is narrow

Method used

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  • Method for setting up mould of cracking reaction in ethylene cracking furance burning and reacting tube
  • Method for setting up mould of cracking reaction in ethylene cracking furance burning and reacting tube
  • Method for setting up mould of cracking reaction in ethylene cracking furance burning and reacting tube

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Embodiment Construction

[0088] Below in conjunction with naphtha cracking furnace example the present invention will be further described:

[0089] The actual production history data of an olefin plant of a petrochemical company is used to verify the effectiveness of the model.

[0090] The model is divided into two systems of furnace combustion and reaction tube to be calculated separately, and the two systems are coupled by thermal boundary conditions. Based on the analysis results of gas components, a PDF file of non-premixed combustion is established for thermochemical calculation, and the PDF file of thermochemical calculation results is imported into the furnace model for calculation of gas combustion and heat transfer. The coupling calculation of the furnace combustion and the pyrolysis reaction in the reaction tube refers to the coupling of boundary conditions, that is, the heat flux (distribution along the tube length) of the reaction tube obtained by the furnace combustion is used (programm...

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Abstract

The disclosed modeling method includes following procedures: building model of cracking fire room; building physical model under size and character identical to actual fire room; based on component analysis result for fuel gas to build PDF model of probability density function from not premixed combustion inside fire room, and to carry out calculating combustion of fuel gas inside fire room; building model of reaction tube of cracking furnace, and molecular reaction model adopted by cracking reaction model inside tubes so that calculated ethane yield from exit of reaction tube is near to or identical to actual yield; carrying out coupling calculation between burning model of cracking fire room and model of reaction tube of cracking furnace; when carrying out coupling calculation, the method carries out programming calculated tube wall temperature and heat flux. The invention is especially suitable to ethene cracker with heat supply from base and burner on sidewall.

Description

technical field [0001] The invention relates to a modeling method for gas combustion in an ethylene cracking furnace and a cracking reaction in a reaction tube. Background technique [0002] The cracking furnace is the key equipment in the ethylene plant. Through the combustion of fuel such as gas or oil in the bottom or side wall burners to release heat, the raw material oil in the furnace reaction tube is cracked and reacted to generate olefins. [0003] The establishment of cracking reaction model of cracking furnace can predict the yield of olefins, which is of great significance to the adjustment of process parameters or the design and transformation of cracking furnace. Since the pyrolysis reaction is an endothermic reaction, it is greatly affected by the combustion of the furnace gas. Therefore, when modeling the cracking reaction, the combustion of the furnace gas must be modeled. For the furnace combustion process, to simplify the calculation, the partition method ...

Claims

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Application Information

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IPC IPC(8): G06F17/50C07C11/04C07C4/02
Inventor 肖睿蒋勇韩云龙卫达许岩峰哈兵章名耀程相杰查新祺胡天生仲怀东
Owner SINOPEC YANGZI PETROCHEM
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