Method for monitoring catalyst circulation volume of catalytic cracking apparatus

Abstract

A method for monitoring a catalyst circulation rate in a catalytic cracking apparatus. A processing unit (4) is arranged on a spent catalyst convey line (5) between a stripper (2) and a regenerator (3) of the catalytic cracking apparatus. The processing unit (4) comprises a temperature control system, a flow rate control system, and a control module system (405). In the processing unit (4), a spent catalyst flows to an outlet (402) near the regenerator end from an inlet (401) near the bottom of the stripper, the temperature changes from T1 to T2, and the temperature is measured and recorded by the temperature control system; a conveying medium and the spent catalyst flow in opposite directions, a flow rate of the conveying medium is F1, the flow rate is measured and recorded by the flow rate control system, the conveying medium flows from an inlet (403) near the regenerator end to an outlet (404) near the bottom of the stripper, the temperature changes from T3 at the inlet to T4 at the outlet, and the temperature is measured and recorded by the temperature control system; the control module (405) displays a catalyst circulation rate in real time, and the formula adopted by the module (405) in calculating the catalyst circulation rate is: catalyst circulation rate=2xF1x[(T4-T3) / (T1-T2)]-1000.

Description

technical field [0001] The invention relates to a method for monitoring catalyst circulation, in particular to a method for on-line monitoring catalyst circulation of a catalytic cracking unit. Background technique [0002] Catalytic cracking unit is one of the most important heavy oil conversion units in petroleum refineries. Under the action of the hot catalyst, the raw oil cracks the heavy oil and transforms it into high-value products such as rich gas, gasoline and diesel. In terms of economic benefits, more than half of the benefits of oil refineries are obtained by catalytic cracking. Therefore, the application of advanced optimization control technology to realize the stable operation of the device and provide conditions for online optimization undoubtedly has important practical significance and obvious economic benefits. [0003] Most of the existing catalytic cracking optimization control schemes are mainly based on the reaction temperature (riser outlet temperat...

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Problems solved by technology

[0007] 2. Calculation of the catalyst circulation by using the heat balance of the regenerator has high accuracy, but the temperature and coke content have a certain time lag for the regenerator; the raw catalyst flows from the riser to the regenerator through the stripping section, and its temperature and coke The content has a time lag of 1-2 minutes for the regenerator, and the real-time performance of its calculation cannot meet the requirements for advanced control of the riser

[0008] 3. Use the material balance of carbon in the regenerator and stripper to calculate the catalyst circulation amount. The carbon content of the raw catalyst and the carbon content of the regenerated catalyst can only be obtained through off-line testing, which has a considerable time lag. Therefore, using carbon balance Calculation of catalyst circulation volume by method can not meet the real-time requirements of production monitoring and control

When the opening of the regeneration valve changes greatly or the fluidization state of the catalyst changes, if a fixed regeneration valve characteristic model is used for calculation, its accuracy will not be guaranteed

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