CN-115779804-B - Intelligent control method and device for industrial MTO reaction depth and catalyst activity

CN115779804BCN 115779804 BCN115779804 BCN 115779804BCN-115779804-B

Abstract

The invention relates to an intelligent control method and device for industrial MTO reaction depth and catalyst activity. The control method is to obtain the operation data of an MTO production device, set an optimization target of MTO production, calculate and obtain a reaction residue content optimization value and a reaction coking rate optimization value which realize the optimization target by taking the reaction residue content as a variable representing the reaction depth, calculate and obtain a regeneration air flow regulating valve position optimization value and a regeneration slide valve position optimization value which respectively realize the reaction residue content optimization value and the reaction coking rate optimization value by adopting an automatic control algorithm or an automatic control model, and control the regeneration air flow regulating valve position and the regeneration slide valve position according to the calculation. The device is provided with an intelligent optimization controller, operation data are acquired through a DCS of the MTO production device, the valve position optimization value of the regenerated air flow regulating valve and the valve position optimization value of the regenerated slide valve under the optimization target are calculated according to an intelligent control model, and corresponding optimization control is realized through the DCS.

Inventors

LI JUNJIE
TAO XINGWEN
SUN ZONGLI
HONG ZHIYI
ZHAO ZHENGWEI
LIANG ZHIGUANG
WU MENG
CHEN JI

Assignees

中煤陕西榆林能源化工有限公司
北京赛普泰克技术有限公司

Dates

Publication Date: 20260508
Application Date: 20221110

Claims (9)

1. The industrial MTO reaction depth and catalyst activity intelligent control method comprises the steps of obtaining operation data of an MTO production device, setting an optimization target of MTO production, taking reaction residue content as a variable representing the reaction depth, calculating to obtain a reaction residue content optimization value and a reaction coke generation rate optimization value which achieve the optimization target based on constraint conditions of the MTO production process and the production device, adopting an automatic control algorithm or an automatic control model, calculating to obtain a regeneration air flow regulating valve position optimization value and a regeneration slide valve position optimization value which respectively achieve the reaction residue content optimization value and the reaction coke generation rate optimization value, regulating the regeneration air flow regulating valve position and the regeneration slide valve position to be respectively positioned at the regeneration air flow regulating valve position optimization value and the regeneration slide valve position optimization value, thereby achieving optimal control of the reaction depth and the catalyst activity.
2. The intelligent control method for the reaction depth and the catalyst activity of industrial MTO according to claim 1, wherein the operation data of the MTO production device includes raw operation data which can be directly obtained and obtained by on-line detection from the MTO production device and calculated according to the raw operation data to obtain estimated operation data.
3. The intelligent control method for the reaction depth and the catalyst activity of the industrial MTO according to claim 2, wherein the mode of directly acquiring and online detecting the original operation data from the MTO production device is that a distributed control system of the MTO production device acquires the original operation data from a process parameter detection instrument and a reactor inlet and outlet component analysis instrument of the MTO production device and/or acquires the original detection data and generates corresponding original operation data based on the original detection data, and an intelligent optimization controller reads the required original operation data through a real-time data reading interface of the distributed control system.
4. The intelligent control method for the reaction depth and the catalyst activity of industrial MTO according to claim 1, wherein an optimizer is constructed based on the constraint conditions of the MTO production process and the production device, and the optimizer calculates and obtains the optimized value of the reaction residue content and the optimized value of the reaction coking rate according to the optimized target of the MTO production output from the outside.
5. The intelligent control method for the reaction depth and the catalyst activity of the industrial MTO according to claim 1, wherein the intelligent control model for the reaction residues, the intelligent control model for the carbon determination of the regenerant and the intelligent control model for the regenerated wind are all PID feedback control models.
6. The intelligent control method for the reaction depth and the catalyst activity of the industrial MTO according to any one of claims 1 to 5, wherein a regeneration air flow auxiliary regulating valve is arranged, the regeneration air flow auxiliary regulating valve comprises an air supplementing valve, an air exhausting small valve and an air exhausting big valve, the air inlet side of the regenerator is connected with a main fan through a regeneration air main pipe, the main fan outlet side is provided with a main valve, the air supplementing valve is arranged on an air supplementing pipe, one end of the air supplementing pipe is an air inlet end and is connected with an air supplementing source, the other end of the air supplementing pipe is an air outlet end, the air exhausting small valve is arranged on a small valve exhausting pipe, one end of the small valve exhausting pipe is an air inlet end and is connected with an air inlet side of the regeneration air main pipe or the regenerator, the other end of the small valve exhausting pipe is an air outlet end and is communicated with air or is connected with an air exhausting facility, the air exhausting big valve is arranged on the big valve exhausting pipe, one end of the air exhausting pipe is connected with the air inlet side of the regeneration air main pipe or the regenerator, the other end is an air outlet end, and is communicated with air or is connected with the air exhausting facility.
7. The intelligent control method for industrial MTO reaction depth and catalyst activity according to claim 6, wherein in the calculation of valve position optimization values related to regenerated wind flow rate adjusting valve, a main valve is used as the regenerated wind flow rate adjusting valve, the main valve position optimization value is calculated, the main valve position is controlled to be at the optimized value, and then the adjustment of the air compensating valve, the air exhausting small valve and the air exhausting large valve is performed according to the real-time regenerated wind flow rate according to the following control logic: 1) Under the condition that the real-time regenerated wind flow is lower than the regenerated wind flow optimizing value, gradually increasing the opening of the supplementary wind valve until the real-time regenerated wind flow is consistent with the regenerated wind flow optimizing value or the difference value between the real-time regenerated wind flow and the regenerated wind flow optimizing value is smaller than the effective adjusting range of the supplementary wind valve, When the situation has a certain emptying amount, or the opening of the emptying small valve or the emptying large valve exceeds a certain limit, the emptying large valve and/or the emptying small valve with a certain opening is preferentially and gradually reduced until the real-time regenerated wind flow is consistent with the regenerated wind flow optimizing value or the opening of the emptying large valve and the emptying small valve is smaller than a certain limit; 2) Under the condition that the real-time regenerated wind flow exceeds the regenerated wind flow optimizing value, if the difference value of the real-time regenerated wind flow and the regenerated wind flow is positioned in the effective adjusting range of the emptying large valve, firstly controlling the emptying large valve to perform rough adjustment until the difference value of the real-time regenerated wind flow and the regenerated wind flow optimizing value enters the adjusting range of the emptying small valve, then controlling the emptying small valve to perform fine adjustment until the real-time regenerated wind flow and the regenerated wind flow optimizing value are consistent, if the difference value of the real-time regenerated wind flow and the regenerated wind flow is positioned in the adjusting range of the emptying small valve, controlling the emptying small valve to perform fine adjustment until the real-time regenerated wind flow and the regenerated wind flow optimizing value are consistent, When the situation has a certain air supplementing quantity or the opening of the air supplementing valve exceeds a certain limit, the opening of the air supplementing valve is preferentially and gradually reduced until the real-time regenerated air flow is consistent with the regenerated air flow optimizing value or the opening of the air supplementing valve is smaller than a certain limit.
8. The intelligent control device for the reaction depth of the industrial MTO and the activity of the catalyst is characterized by adopting the intelligent control method for the reaction depth of the industrial MTO and the activity of the catalyst according to any one of claims 1-7 to carry out intelligent optimal control on the reaction depth of the industrial MTO and the activity of the catalyst, comprising a distributed control system of the MTO production device and an intelligent optimal controller, wherein the distributed control system obtains original operation data from a process parameter detection instrument of the MTO production device and a reactor inlet and outlet component analysis instrument and/or obtains the original detection data and generates corresponding original operation data based on the original detection data, the intelligent optimal controller calculates and obtains calculated operation data according to the original operation data, obtains an optimal value for the reaction residue content and an optimal value for the reaction coking rate based on constraint conditions of an MTO production process and a production device, calculates and obtains a valve position optimal value for a regenerated air flow regulating valve and a regenerated optimal value for the reaction residue content and the optimal value for the reaction coking rate respectively by adopting an automatic control algorithm or an automatic control model, and the intelligent optimal controller is used for realizing the optimal valve position value for the regenerated air flow regulating valve and the regenerated valve.
9. The intelligent control device for controlling the reaction depth and the catalyst activity of the industrial MTO according to claim 8, wherein the intelligent optimization controller interacts with an operator station and an engineer station, receives information input by the engineer station and the operator station, the information input by the engineer station comprises optimization targets, the information input by the operator station comprises upper and lower limits of each operation variable, the distributed control system is provided with a real-time data reading interface and a real-time data write-back interface which are communicated with the intelligent controller, the intelligent controller reads original operation data through the real-time data reading interface, and writes the calculated regenerated wind flow control valve position optimization value and the regenerated slide valve position optimization value into the distributed control system through the real-time data write-back interface.

Description

Intelligent control method and device for industrial MTO reaction depth and catalyst activity Technical Field The invention relates to an intelligent control method for the reaction depth of industrial MTO and the activity of a catalyst and a device for intelligently controlling the reaction depth of industrial MTO and the activity of the catalyst by adopting the method, which belong to the technical field of industrial control, in particular to an intelligent control technology for MTO production. Background MTO (methanol to olefin) is an important coal chemical production process, and with the rising of petroleum price in recent years, coal chemical industry and natural gas chemical industry are rapidly developed, and the methanol productivity is greatly increased. The method is characterized in that methanol is used for preparing olefin from coal or natural gas as a raw material, the methanol is dehydrated under the condition of a catalyst to generate low-carbon olefin, the basic technological process of MTO production in the current industrial application is basically the same, the MTO reaction and catalyst regeneration and circulation are realized by adopting a fluidized bed reactor (called a reactor for short) and a catalyst regenerator (called a regenerator for short), the methanol is reacted in the reactor (the fluidized bed) under the action of the catalyst to generate olefin with certain component distribution, and the catalyst separated from product gas (reaction gas) is recycled, wherein part of the catalyst is introduced into the regenerator to be burnt and regenerated before being returned to the reactor again so as to control and maintain the required catalyst activity. The production investment, the production process and the production products (including component distribution, yield of each product and the like) can be controlled by controlling the reaction conditions (material composition, process parameters and the like) in the reactor and the catalyst activity, and the optimization control is performed according to the set optimization targets. The control of the MTO reaction depth is an important content of MTO production control, the control is basically completed by manual operation of operators at present, carbon determination (carbon content) of a regenerant and a spent agent is tested and analyzed once every 4 hours, and the operators adjust the regeneration air quantity according to the reaction conditions, such as the reaction residual quantity of ethylene, propylene, dimethyl ether and the like at the outlet of a reactor, and control the carbon determination to an expected level so as to adjust the activity of a catalyst, thereby achieving the purpose of adjusting the reaction depth. However, the reaction depth control mode has some problems to be solved in the actual operation process, and the problems are mainly represented by long fixed carbon test period (more than 4 hours), large hysteresis and large fixed carbon fluctuation of the catalyst, and the ideal operation state cannot be achieved, and the optimization space still exists for the unit consumption of the methanol. Therefore, the intelligent control and intelligent optimization system is developed to optimally control the reaction depth of the MTO device, so that the automation and intelligence level of the device is further improved, the unit consumption of diene methanol is reduced on the basis of stable operation and safe production, the yield of diene is improved, the energy consumption is reduced, and the economic benefit of the device is improved. On the other hand, the automatic detection and automatic control technology is continuously developed, so as to provide powerful support for the automatic and intelligent control of MTO production, so that a lot of researches on a methanol-to-olefin catalyst, reaction characteristics, process technology and the like are carried out in the world, a lot of efforts are put into internationally known petroleum and chemical companies, such as Mobil, basf, exxon, UOP, norsk Hydro and the like, and a plurality of different automatic control means are applied, such as feeding control, liquid level control, pressure control, reaction temperature control, regenerated air flow control, reactor catalyst level control and the like, for a plurality of single-loop control modes, such as feeding control, liquid level control, pressure control, reaction temperature control, regeneration air flow control and the like, for the basic process of MTO production, and MTO catalytic reaction is also studied for a long time in China. For example, the university of inner Mongolian science and technology applies fuzzy control technology to PID control of MTO, attempts to perform correlation analysis on reaction system variables from the engineering application point of view, provides an advanced fuzzy PID control strategy [1] for the system, promotes the development of the intellectualization o