Dynamic soft-measuring method of ingredients of regenerated flue gas generally regenerated by catalytic cracking device

Abstract

The invention relates to a dynamic soft-measuring method of ingredients of regenerated flue gas generally regenerated by a catalytic cracking device, which belongs to the technical field of production process soft measurement. The method is characterized by comprising the following steps: utilizing a dynamic model of mechanism analysis of a regenerator to preliminarily estimate the mol flow of all main ingredients of the regenerated flue gas and the heat capacity of the regenerated flue gas; utilizing the heat balance of a CO incinerator to further estimate the CO content of the regenerated flue gas more accurately; returning the estimation value of the CO content into the dynamic model of the mechanism analysis of the regenerator, and calculating more accurate CO content; repeating the iterative algorithm, and estimating important immeasurable variables of the regenerator when the CO estimation value is converged. By jointly utilizing the dynamic model of the mechanism analysis of the regenerator and the heat balance of the external CO incinerator and adopting the combined way of an on-line and real-time process computing technology and a dynamic model observation technology, theinvention achieves the dynamic soft measurement of immeasurable variables of the regenerator in the catalytic cracking device and provides helps for safety production as well as energy saving and consumption reduction in important production processes.

Description

technical field [0001] The invention relates to a dynamic mechanism model of conventional regeneration of catalytic cracking CO and a heat balance model of an incinerator, and belongs to the field of petrochemical catalytic cracking production and production process soft measurement. Background technique [0002] Catalytic cracking is one of the main processes for petroleum refineries to produce gasoline from heavy oil. It is a process in which heavy oil undergoes a cracking reaction under the action of heat and a catalyst, and is transformed into cracked gas, gasoline and diesel. The raw material is heavy distillate oil obtained from crude oil distillation (or other petroleum refining processes); or heavy distillate mixed with a certain proportion of residual oil, deasphalted residual oil after solvent deasphalting; or all use atmospheric pressure residual oil or vacuum residue. [0003] During the reaction process, non-volatile carbon-like substances are deposited on the ...

AI Technical Summary

Problems solved by technology

[0008] 1. CO content in flue gas, CO in flue gas 2 content and water vapor content in flue gas can be measured by online analyzers, but online analyzers are expensive and are generally used less

At present, the factory mainly adopts offline testing, which takes a long time and often takes 3 hours or even longer to obtain the analysis results; the testing frequency is low, usually every two or three days.

[0009] 2. There is no on-site measurement method for the regenerated catalyst circulation amount, total coke generation amount, and coke generation rate

[0014] In the conventional regenerative CO soft measurement, the methods currently used usually have a heat balance model or an internal dynamic mechanism model. Due to the lack of information utilization for the entire production process, the measurement results are not ideal.

On the one hand, due to the large difference between different working conditions, it is difficult to calculate a suitable internal dynamic mechanism model, and its deviation from the actual working condition is often large, resulting in poor measurement accuracy; even if it is corrected by the online correction method, it is difficult Correctly correct for deviations in model structure

On the other hand, for the heat balance model, since the composition of the regenerator flue gas is unknown, it is difficult to obtain the average calorific value of the flue gas, and the heat balance calculation thus lacks the necessary initial estimates, so the actual accuracy is not ideal

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