A method for realizing cracking depth analysis of industrial cracking furnace

Abstract

The invention relates to a method for realizing cracking depth analysis of an industrial cracking furnace, which includes extracting materials, cooling, gas-liquid separation, drying, on-line analysis and a corresponding automatic switch system, and the specific steps are as follows: (1) Leading out the logistics: in the industrial cracking furnace A stream of pyrolysis products is drawn from the inlet or outlet of the waste heat boiler or the quench boiler; (2) cooling: cooling the material described in step (1) to form a gas-liquid two-phase flow; (3) gas-liquid separation: cooling step (2) The final gas-liquid two-phase flow is subjected to gas-liquid separation, the liquid phase is water, tar and solid impurities, and the gas phase is cracked gas and water vapor; (4) drying: the gas-phase stream after the gas-liquid separation in step (3) is dried, Remove water vapor therein; (5) On-line analysis: The cracked gas after step (4) drying is passed into on-line chromatogram to carry out, analyze the content of methane, ethylene, propylene wherein, by calculating the weight ratio of propylene / ethylene or methane / propylene to calculate the cleavage depth.

Description

Technical field [0001] The invention relates to a method for realizing cracking deep analysis of an industrial cracking furnace, in particular to a method for realizing cracking deep analysis of an industrial cracking furnace by using online chromatography technology. Background technique [0002] At present, 98% of the world's total ethylene production is produced by steam cracking through cracking furnaces, and the current and future newly increased ethylene capacity is mainly produced by cracking furnaces by steam cracking. The cracking furnace is the main device for producing basic organic chemical raw materials such as ethylene, propylene, butadiene, aromatics, etc. The energy consumption of the cracking furnace accounts for more than 70% of the entire ethylene production device. [0003] During the production operation of the cracking furnace, in addition to the cracked raw materials, the factors affecting the yield of the cracked products are the feed volume (Foil), steam vo...

AI Technical Summary

Problems solved by technology

[0006] The purification ability is insufficient, and the solid impurities in the sample gas cause the pipeline and the online chromatographic inlet to be blocked;

[0007] The heavy hydrocarbon components in the sample gas condense in the pipeline, causing system blockage;

[0008] Heavy components in the pyrolysis gas cause blockage of the sampling port, and may even cause blockage and chromatographic contamination

[0009] Due to the problem of the operation of the pretreatment system, the online chromatography cannot be operated continuously and stably, and the online analysis of methane, ethylene, propylene, etc. in the cracked gas cannot be performed in time, and it is difficult to determine the cracking depth of the cracking furnace, which affects ethylene, propylene, etc. Yield of cleavage product

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