A Prediction Method for Coke Cleaning Time of Heating Furnace Tubes in Refining and Chemical Plants

Abstract

The invention discloses a method for predicting decoking time of furnace tubes of a refining device heating furnace. The method includes the following steps that (1) the raw material inlet flow of each furnace tube, the steam flow of each furnace tube, the furnace tube wall temperature, the furnace box temperature of the heating furnace, the heating furnace outlet temperature and the already continuously working time of the heating furnace are monitored; (2) real-time data of each monitored object are recorded at intervals of six hours, and the data of two months are continuously collected to form a sample library; (3) a data fitting method and an artificial neural network method are adopted for calculation, and estimated time when the furnace tube wall temperature reaches the upper limit is obtained respectively; and (4) the maximum working time which the furnace tubes allow at present is obtained through a voting method. By means of the method for predicting the decoking time of the furnace tubes of the refining device heating furnace, the optimal time point for decoking of the furnace tubes of the heating furnace can be predicted, the device production loss is helped to decrease to the minimum, and the danger of burnthrough of the furnace tubes due to excessively thick cokes can be avoided.

Description

technical field [0001] The invention relates to a data processing method, in particular to a method for predicting the decoking time of heating furnace tubes of refining and chemical equipment. Background technique [0002] The heating furnace tube coking of refining and chemical equipment is the phenomenon that the oil in the furnace tube is thermally cracked after the temperature exceeds a certain limit, becomes free carbon, and accumulates on the inner wall of the tube. It mainly occurs in vacuum furnaces, coking furnaces, visbreaking furnaces Furnaces, lubricating oil heating furnaces and ethylene cracking furnaces. [0003] Coking process: Coking is initially caused by thermal cracking, polycondensation, polymer material segregation, etc., mainly due to the reaction caused by heating; however, due to the small flow rate, the turbulent state cannot be reached, and the above reactants remain on the tube wall and gradually deposit up. , forming a focal layer. [0004] Th...

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Problems solved by technology

However, no matter what method is used, it will affect the production of the device and cause economic losses.