CN117323921B - Method and system for controlling oxygen content of regeneration reactor - Google Patents
Method and system for controlling oxygen content of regeneration reactor Download PDFInfo
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- CN117323921B CN117323921B CN202311630784.1A CN202311630784A CN117323921B CN 117323921 B CN117323921 B CN 117323921B CN 202311630784 A CN202311630784 A CN 202311630784A CN 117323921 B CN117323921 B CN 117323921B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 182
- 239000001301 oxygen Substances 0.000 title claims abstract description 182
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 182
- 230000008929 regeneration Effects 0.000 title claims abstract description 78
- 238000011069 regeneration method Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 64
- 238000002485 combustion reaction Methods 0.000 claims abstract description 63
- 238000011068 loading method Methods 0.000 claims abstract description 10
- 238000005457 optimization Methods 0.000 claims abstract description 8
- 238000012937 correction Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 28
- 238000009826 distribution Methods 0.000 claims description 19
- 238000004088 simulation Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 5
- 238000009499 grossing Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000007670 refining Methods 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 description 40
- 230000001276 controlling effect Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 15
- 238000002407 reforming Methods 0.000 description 13
- 238000005259 measurement Methods 0.000 description 6
- 230000005484 gravity Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000012549 training Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
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- 230000000007 visual effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000006227 byproduct Substances 0.000 description 1
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- 208000012839 conversion disease Diseases 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000006057 reforming reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
- B01J8/0035—Periodical feeding or evacuation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/08—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles
- B01J8/082—Controlling processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/08—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles
- B01J8/12—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles moved by gravity in a downward flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
- B08B7/0071—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by heating
- B08B7/0085—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by heating by pyrolysis
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Feedback Control In General (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Abstract
The invention relates to the technical field of refining production, and provides a method and a system for controlling the oxygen content of a regeneration reactor, wherein the method for controlling the oxygen content of the regeneration reactor comprises the following steps: loading an operation peak temperature position prediction model and a pre-established oxygen content controller on line, and periodically controlling an oxygen content set value of the regeneration reactor; in a control period, the peak temperature position prediction model outputs a peak temperature position prediction value according to the position data of a thermocouple measuring point and the measured temperature data of a thermocouple measuring point in the regeneration reactor, which are acquired in real time, and the oxygen content controller performs rolling optimization and feedback correction according to the deviation between the peak temperature position prediction value and a set peak temperature position target value and outputs an oxygen content set value. The position corresponding to the peak of the combustion temperature can be stabilized near the target position.
Description
Technical Field
The invention relates to the technical field of refining production, in particular to a method and a system for controlling oxygen content of a regeneration reactor.
Background
Continuous reforming is a process of hydrocarbon chemical reaction conversion by a catalyst under high-severity conditions, and uses high-octane gasoline and aromatic hydrocarbon as main products and byproducts of hydrogen. Coke generated by side reactions of raw coke generated by continuous reforming is deposited on the surface of the catalyst, so that the activity of the catalyst is reduced. In order to restore the activity of the catalyst, the catalyst needs to be subjected to a scorching treatment, and part of chloride lost by the catalyst in the scorching process and the reaction process is supplemented, and active metals are reduced. The spent catalyst flows out from the tail end of the overlapped reactor and is lifted to a catalyst regeneration part, and the spent catalyst is regenerated according to five steps: (1) scorching, (2) chloridizing, (3) drying, (4) cooling, and (5) reducing. The regenerated fresh catalyst is circulated and lifted to the reforming reactor, in this way, the fresh catalyst continuously and circularly passes through the reforming reactor, so that the reforming reaction is ensured to be carried out under high severity and can run for a long period.
However, the scorch will cause the catalyst to rise in temperature and the high temperature increases rapidly, which is liable to cause permanent damage to the catalyst, so that the scorch process must be controlled. The control of the burn is achieved by controlling the oxygen content during the burn, with high oxygen content resulting in higher combustion temperatures, which will cause damage to the catalyst mainly in the form of surface area loss, and low oxygen content resulting in slower burn and incomplete burn in the combustion zone. If scorching occurs in the chlorination zone, very high temperatures will occur and serious damage to the catalyst (alumina state change) and chlorination zone equipment will occur. The burning is mainly performed in the combustion zone, and in order to minimize the negative influence caused by the burning, it is necessary to stably maintain the burning in the combustion zone, and the oxygen content in the combustion zone should be reduced to a minimum while ensuring the complete burning in the combustion zone.
The current scorch control scheme is as follows: 1. the regenerator structure is improved, and the operation thinking is adjusted to control the combustion temperature, so that the equipment investment cost is increased virtually. 2. Regulating and controlling the oxygen content of the inlet of the regenerator based on the soft instrument predicted value of the coking carbon content of the catalyst, and realizing complex model training and testing, and relatively simple applicable working conditions; when a manufacturer does not have a carbon content analyzer, training samples are difficult to obtain; when the situation of soft instrument model prediction distortion occurs, the modeling is retrained, which is unfavorable for the convenience of later maintenance.
For this reason, an improved char control scheme is needed.
Disclosure of Invention
First technical problem
In view of the above-mentioned drawbacks and disadvantages of the prior art, the present invention provides a method and a system for controlling oxygen content in a regeneration reactor, which can stabilize a position corresponding to a peak of combustion temperature near a target position.
(II) summary of the invention
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
in a first aspect, the present invention provides a regeneration reactor oxygen content control method comprising: loading an operation peak temperature position prediction model and a pre-established oxygen content controller on line, and periodically controlling an oxygen content set value of the regeneration reactor; in a control period, the peak temperature position prediction model outputs a peak temperature position prediction value according to the position data of a thermocouple measuring point and the measured temperature data of a thermocouple measuring point in the regeneration reactor, which are acquired in real time, and the oxygen content controller performs rolling optimization and feedback correction according to the deviation between the peak temperature position prediction value and a set peak temperature position target value and outputs an oxygen content set value.
Optionally, after loading the operation peak temperature position prediction model and the pre-established oxygen content controller on line, before controlling the oxygen content set point, the method further comprises: based on the peak temperature position prediction model, the oxygen content controller optimizes the operating variables, the control variables and the controller parameters on line according to the upper/lower limits of the set oxygen content values, the upper/lower limits of the peak temperature positions and the target values of the peak temperature positions.
Optionally, the peak temperature position prediction model outputs a peak temperature position prediction value according to position data of a thermocouple measurement point and measured temperature data of the thermocouple measurement point in the regeneration reactor, which are acquired in real time, and the peak temperature position prediction model comprises: according to the position data of the thermocouple measuring points and the measured temperature data of the thermocouple measuring points, the measuring point positions and the measuring point temperatures are in one-to-one correspondence, and the associated data of the measuring point positions and the measuring point temperatures are obtained; interpolation processing is carried out on the related data of the measuring point position and the measuring point temperature, and a distribution curve of the combustion temperature along the axis of the regeneration reactor is obtained; and determining a peak temperature position predicted value according to the distribution curve.
Alternatively, a Lagrange quadratic interpolation method is adopted to interpolate the related data of the measuring point position and the measuring point temperature at set intervals.
Optionally, the establishing process of the oxygen content controller comprises the following steps:
101. acquiring associated data of an oxygen content set value and a peak temperature position predicted value in a preset time period according to the peak temperature position predicted model, and carrying out model identification according to the associated data of the oxygen content set value and the peak temperature position predicted value to acquire an oxygen content control model;
102. and configuring according to the oxygen content control model to obtain the oxygen content controller.
Optionally, the transfer function expression of the oxygen content control model is:
，
in the method, in the process of the invention,peak temperature position->For oxygen content set point, < >>Is constant.
Optionally, 102 further comprises: based on the peak temperature position prediction model, the oxygen content controller performs simulation running according to the upper/lower limit of the set oxygen content value, the upper/lower limit of the peak temperature position and the target value of the peak temperature position, and the controller parameters are debugged.
Optionally, the control parameters include a smoothing coefficient of the oxygen content set value, an optimized maximum/minimum increment, a controlled maximum/minimum increment, a closed loop reference time of the debug peak temperature relative to the coordinates, an operation constraint upper/lower limit transition interval, an operation constraint upper/lower limit level, a set value region upper/lower limit level, an operation constraint upper/lower limit control equivalent deviation, a set value region upper/lower limit equivalent deviation, a gain constant, and a time constant.
In a second aspect, the present invention provides a regeneration reactor oxygen content control system comprising:
the server is used for loading an operation peak temperature position prediction model and a pre-established oxygen content controller on line and periodically outputting an oxygen content set value of the regeneration reactor; in a period of outputting the oxygen content set value, the peak temperature position prediction model outputs a peak temperature position predicted value according to the position data of a thermocouple measuring point and the measured temperature data of a thermocouple measuring point in the regeneration reactor, which are obtained in real time, and the oxygen content controller performs rolling optimization and feedback correction according to the deviation between the peak temperature position predicted value and the set peak temperature position target value and outputs the oxygen content set value;
and the DCS is used for controlling the regeneration reactor through a PID control loop according to the oxygen content set value written in by the server.
(III) beneficial effects
According to the method and the system for controlling the oxygen content of the regeneration reactor, the position corresponding to the peak value of the combustion temperature can be accurately predicted through the peak temperature position prediction model, and then the oxygen content controller can realize real-time regulation and control of the oxygen content according to the predicted value of the peak temperature position and the set target value of the peak temperature, so that the peak value of the combustion temperature is stabilized near the target position, reasonable distribution of a temperature curve of a combustion area is realized through optimizing and controlling the set value of the oxygen content, the burning rate is controlled and stabilized, the service life of a catalyst is prolonged, and safe and stable operation of the regenerator is ensured. The problem of difficult control of the bed temperature of the combustion zone is solved on the basis of not reforming the regenerator equipment structure and not increasing the installation thermocouple assembly, and the problems of complex modeling training of the soft instrument, high maintenance difficulty caused by prediction distortion in the prior art are solved, the additional investment is not required, the application range is wide, and the controller structure is reliable and the maintainability is convenient.
Drawings
FIG. 1 is a schematic flow diagram of a continuous reforming catalyst regeneration system process according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a regeneration reactor according to an embodiment of the present invention;
FIG. 3 is a schematic flow diagram of a regeneration reactor oxygen content control method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an implementation platform architecture of a regeneration reactor oxygen content control method according to an embodiment of the present invention;
FIG. 5 is a schematic illustration of a combustion zone combustion temperature profile along a regeneration reactor axis according to an example of an application of the present invention;
FIG. 6 is a schematic diagram showing the real-time presentation of the peak combustion temperature of a combustion zone according to an example of application of the present invention;
FIG. 7 is a schematic diagram showing the predicted peak temperature position value of a combustion zone versus the target peak temperature position value in real time according to an embodiment of the present invention;
FIG. 8a is a schematic illustration of an oxygen content setpoint adjustment process for a manually adjusted regeneration reactor according to an example of the present invention;
FIG. 8b is a schematic illustration of the adjustment of the oxygen level set point of the regeneration reactor after being put into the oxygen level control method of the regeneration reactor according to an embodiment of the present invention;
FIG. 9a is a graph showing the distribution of the peak combustion temperature in the combustion zone corresponding to the oxygen content set point adjustment process of FIG. 8 a;
FIG. 9b is a graph showing the distribution of peak combustion temperature values in the combustion zone corresponding to the oxygen content set point adjustment process of FIG. 8 b;
FIG. 10a is a schematic diagram showing the distribution of the peak temperature positions of the combustion zone corresponding to the oxygen content set point adjustment process of FIG. 8 a;
FIG. 10b is a graph showing the distribution of the peak temperature positions of the combustion zone corresponding to the oxygen content set point adjustment process of FIG. 8 b.
Detailed Description
The invention will be better explained by the following detailed description of the embodiments with reference to the drawings.
For a better understanding of the present invention, the construction of the continuous reforming catalyst regeneration system process and the regeneration reactor will be described with reference to fig. 1 and 2, respectively.
FIG. 1 is a schematic flow diagram of a continuous reforming catalyst regeneration system process. As shown in fig. 1, the catalyst enters the reforming second reactor from the reforming first reactor by gravity, enters the reforming third reactor by lifting of hydrogen, and enters the reforming fourth reactor by gravity. The nitrogen is lifted to the upstream of the regeneration reactor to enable the catalyst to enter a chlorine adsorption tank (chlorine adsorption zone) after being separated from a hopper, and then enter the top of the regeneration reactor under the action of gravity, and then sequentially pass through a preheating zone, a burning zone, a reheating zone, a oxychlorination zone, a drying zone and a cooling zone from top to bottom. The cooled catalyst is lifted to a regenerated catalyst separating hopper, and sequentially enters a lock hopper separating tank, a lock hopper and a lock hopper buffer tank, so that the circulating amount of the catalyst is controlled, and the pressure conversion of the catalyst conveyed from a low-pressure regeneration zone to a high-pressure reactor reduction zone is completed. The catalyst is sent to the L valve group from the bottom of the lock hopper buffer tank under the action of gravity, the regenerated catalyst is lifted to a reduction zone at the top of the reactor by the hydrogen-rich gas, the oxidized catalyst flows through the reduction zone, and the oxidized catalyst is reduced to a metal state by the hydrogen-rich gas. The catalyst flows into the first reactor from the bottom of the reduction zone by gravity, thus completing the circulation of the catalyst.
FIG. 2 is a schematic diagram of the structure of a regeneration reactor. As shown in fig. 2, the regeneration reactor has 9 thermocouple points aligned along the axis of the regeneration reactor.
The temperature of the bed layer is a good index of coking and burning in the reaction combustion zone, and forms a distribution curve from the top of the combustion zone to the bottom of the combustion zone, wherein the temperature peak value exists in the distribution curve of the temperature of the bed layer. The research finds that: the position corresponding to the temperature peak value is stabilized near the target position by controlling the oxygen content set value, so that the burning can be controlled to be stably maintained in the burning zone, the burning efficiency is high, the required oxygen content is low, the burning in the burning zone can be ensured to be complete, and the catalyst cannot be damaged.
A plurality of thermocouples are sequentially installed from the top of the combustion zone to the bottom of the combustion zone on the inner wall of the regenerator, the bed temperature of the combustion zone is monitored through the thermocouples, however, the positions and the quantity of the installed thermocouples are limited, the peak value of the combustion temperature is difficult to detect through the installed thermocouples, and then an operator cannot accurately judge the position corresponding to the peak value of the combustion temperature. The operator can only estimate the position corresponding to the combustion temperature peak value according to experience, so that the oxygen content set value is frequently adjusted to control the burning rate, the labor intensity of the operator is high, the condition of improper operation often occurs, the inlet oxygen content of the combustion area is excessively high, the temperature of the bed layer is excessively increased, the catalyst is damaged, or the inlet oxygen content of the combustion area is excessively low, the catalyst is incompletely burned, even the lower part of the regenerator is possibly overheated and then stopped, and the stable and safe operation of production is influenced.
To this end, the present invention provides a regeneration reactor oxygen content control method, as shown in fig. 3, comprising the steps of:
loading an operation peak temperature position prediction model and a pre-established oxygen content controller on line, and periodically controlling an oxygen content set value of the regeneration reactor; in a control period, the peak temperature position prediction model outputs a peak temperature position prediction value according to the position data of a thermocouple measuring point and the measured temperature data of a thermocouple measuring point in the regeneration reactor, which are acquired in real time, and the oxygen content controller performs rolling optimization and feedback correction according to the deviation between the peak temperature position prediction value and a set peak temperature position target value and outputs an oxygen content set value.
Therefore, the oxygen content control method of the regeneration reactor provided by the invention can accurately predict the position corresponding to the combustion temperature peak value through the peak temperature position prediction model, and further the oxygen content controller can realize real-time regulation and control of the oxygen content according to the peak temperature position prediction value and the set peak temperature position target value, so that the combustion temperature peak value is stabilized near the target position, reasonable distribution of a temperature curve of a combustion area is realized through optimizing and controlling the oxygen content set value, the burning rate is controlled and stabilized, the service life of a catalyst is prolonged, and the safe and stable operation of the regenerator is ensured. According to the regeneration reactor oxygen content control method provided by the invention, the problem of difficult control of the bed temperature of the combustion zone is solved on the basis of not modifying the equipment structure of the regenerator and not increasing the installation of the thermocouple assembly, and the problem of high maintenance difficulty caused by complex modeling training of a soft instrument and prediction distortion in the prior art is solved; therefore, the regeneration reactor oxygen content control method provided by the invention has the advantages of no additional investment, wide application range, reliable controller structure and convenient maintainability.
Preferably, after loading the operation peak temperature position prediction model and the pre-established oxygen content controller on line, before controlling the oxygen content set point, the method further comprises: based on the peak temperature position prediction model, the oxygen content controller optimizes the operating variables, the control variables and the controller parameters on line according to the upper/lower limits of the set oxygen content values, the upper/lower limits of the peak temperature positions and the target values of the peak temperature positions. In this way, the robustness of the oxygen content controller in use is improved.
Preferably, the peak temperature position prediction model outputs a peak temperature position prediction value according to position data of a thermocouple measurement point and measured temperature data of the thermocouple measurement point in the regeneration reactor, which are acquired in real time, and the peak temperature position prediction model comprises: according to the position data of the thermocouple measuring points and the measured temperature data of the thermocouple measuring points, the measuring point positions and the measuring point temperatures are in one-to-one correspondence, and the associated data of the measuring point positions and the measuring point temperatures are obtained; interpolation processing is carried out on the related data of the measuring point position and the measuring point temperature, and a distribution curve of the combustion temperature along the axis of the regeneration reactor is obtained; from the distribution curve, a peak temperature (i.e., combustion temperature peak) position prediction value is determined.
Specifically, the position data of the thermocouple point is the installation distance Li (i=1, 2,3 … … 9) between the thermocouple point i and the horizontal reference line in mm.
Specifically, as shown in fig. 4, as an example, the measured temperature data of the thermocouple measurement point is transmitted to the DCS system and displayed by the visual field real-time monitoring software, and the values are read by the visual field OPC service software through the control network, and then the data is collected and processed by the APC (Advanced Process Control, advanced control) software; the position data of the thermocouple measurement points are stored in the APC software in advance.
Specifically, a Lagrange quadratic interpolation method is adopted to interpolate the related data of the measuring point position and the measuring point temperature at set intervals. Further, the set interval is 1mm.
Preferably, the oxygen content controller establishment process comprises the steps of:
101. according to the peak temperature position prediction model, obtaining the associated data of the oxygen content set value and the peak temperature position prediction value in a preset time period, and carrying out model identification according to the associated data of the oxygen content set value and the peak temperature position prediction value to obtain an oxygen content control model.
Specifically, in the present embodiment, 101 further includes: preprocessing the related data of the oxygen content set value and the peak temperature position, and carrying out model identification according to the related data of the preprocessed oxygen content set value and the peak temperature position. Further, preprocessing comprises filtering of data, outlier rejection and good/bad value processing.
Specifically, in the present embodiment, performing model identification according to the correlation data between the oxygen content set value and the peak temperature position includes: and determining an oxygen content control model by taking the catalyst circulation amount and the regeneration gas flow as disturbance variables, wherein the oxygen content control model shows the relation between an oxygen content set value and a peak temperature position.
Specifically, in the present embodiment, the transfer function expression of the oxygen content control model is:
，
in the method, in the process of the invention,peak temperature position->For oxygen content set point, < >>Is constant, about 2.71828.
And carrying out model simulation and correlation analysis on the oxygen content control model, and confirming that a model simulation curve is in trend coincidence with a historical data curve, so that the oxygen content control model truly presents the relation between an oxygen content set value and a peak temperature position.
102. And configuring according to the oxygen content control model to obtain the oxygen content controller.
Specifically, in the present embodiment, 102 further includes: based on the peak temperature position prediction model, the oxygen content controller performs simulation running according to the upper/lower limit of the set oxygen content value, the upper/lower limit of the peak temperature position and the target value of the peak temperature position, and the controller parameters are debugged. In this way, the robustness of the oxygen content controller in use is improved.
Specifically, the control parameters include a smoothing coefficient of the oxygen content set value, an optimized maximum/minimum increment, a controlled maximum/minimum increment, a closed-loop reference time of the debug peak temperature relative coordinates, an operation constraint upper/lower limit transition interval, an operation constraint upper/lower limit level, a set value region upper/lower limit level, an operation constraint upper/lower limit control equivalent deviation, a set value region upper/lower limit equivalent deviation, a gain constant, and a time constant.
As one example, based on a peak temperature position prediction model, an oxygen content controller performs a simulation operation of a simulation based on upper/lower limits of a set oxygen content set value, the upper/lower limits of the peak temperature position, and a peak temperature position target value, adjusts a smoothing coefficient of the oxygen content set value, including: in the simulation operation process, after the catalyst circulation quantity is reduced, the peak temperature position predicted by the peak temperature position prediction model is shifted upwards, when the simulation observes that the oxygen content set value is adjusted and reduced too fast, the peak temperature position is finally higher than the peak temperature position target value, and the simulation debugging increases the smooth coefficient of the oxygen content set value to slow down the adjusting action speed of the oxygen content set value.
In this embodiment, as shown in fig. 4, the method for controlling oxygen content of the regeneration reactor provided by the invention adopts advanced process control software APC-Suite of central control technology, uses APC-iSYS advanced control platform to collect, process and store data of a combustion area of the regeneration reactor, uses OPC communication protocol mode to read and write DCS system data in batch in real time, uses APC-ARC agility control software to implement operation process of a peak temperature position prediction model, uses APC-Adcon multivariable prediction control software to establish an oxygen content control model, designs configuration of an oxygen content controller, simulation and debugging of the oxygen content controller, uses APC-Online on-line engineering management software to perform optimized operation of the oxygen content controller, and realizes advanced control output adjustment of an oxygen content set value of the regeneration reactor.
The invention also provides a regeneration reactor oxygen content control system, comprising:
the server is used for loading an operation peak temperature position prediction model and a pre-established oxygen content controller on line and periodically outputting an oxygen content set value of the regeneration reactor; in a period of outputting the oxygen content set value, the peak temperature position prediction model outputs a peak temperature position predicted value according to the position data of a thermocouple measuring point and the measured temperature data of a thermocouple measuring point in the regeneration reactor, which are obtained in real time, and the oxygen content controller performs rolling optimization and feedback correction according to the deviation between the peak temperature position predicted value and the set peak temperature position target value and outputs the oxygen content set value.
And the DCS is used for controlling the regeneration reactor through a PID control loop according to the oxygen content set value written in by the server.
It should be noted that, for specific functions of the server in the regeneration reactor oxygen content control system provided by the present invention, reference may be made to the detailed description of the method for controlling oxygen content of the regeneration reactor provided above, which is not repeated herein.
An example of application of the regeneration reactor oxygen content control method of the present invention is provided below for illustration.
The temperature of a regeneration reactor of a regeneration system of a continuous reforming device of a certain company is influenced by the circulating amount of a catalyst, the carbon content of a catalyst to be regenerated and the gas flow of a combustion zone, the temperature peak value fluctuation interval of the combustion zone is large, the scorching temperature is unstable, an operator continuously adjusts an oxygen content set value to keep the peak temperature at a stable position, the operation strength is high, improper adjustment of the oxygen content easily occurs, the peak temperature fluctuation is large, the peak temperature position is shifted up and down, and the operation difficulty is high.
Specifically, as shown in fig. 8a, a schematic diagram of an adjustment process for manually adjusting the oxygen content set point of the regeneration reactor is shown, wherein the abscissa represents time, the coordinate value represents xx-day xx-hour xx minutes xx seconds, for example, 13:59:00 represents 13-day 20-hour 59 minutes 00 seconds, and the ordinate represents oxygen content; it can be seen that the adjustment process of the oxygen content set point fluctuates greatly. As shown in fig. 9a, a distribution diagram of the peak combustion temperature in the combustion zone corresponding to the oxygen content set value adjustment process of fig. 8a is shown, wherein the abscissa represents time, the coordinate values represent xx-day xx-time xx minutes xx seconds, for example, 13:59:00 represents 13-day 20 minutes 00 seconds, and the ordinate represents temperature in degrees celsius; the peak temperature fluctuation is large, so that the condition that the peak temperature fluctuation is large due to improper oxygen content adjustment easily occurs when the oxygen content set value is manually adjusted is indicated. As shown in fig. 10a, a distribution diagram of the combustion peak temperature position of the combustion zone corresponding to the oxygen content set value adjustment process of fig. 8a is shown, wherein the abscissa is time, the coordinate value represents xx minutes xx seconds at xx sun xx, for example, 13:59:00 represents 59 minutes 00 seconds at 13 sun 20, the ordinate is peak temperature position, the coordinate value represents a specific position between two adjacent thermocouples, for example, 2.800 represents a position between the 2 nd thermocouple and the 3 rd thermocouple, and 800/1000,3.600 of the interval between the 2 nd thermocouple and the 3 rd thermocouple represents a position between the 3 rd thermocouple and the 4 th thermocouple, and the interval between the 3 rd thermocouple and the 3 rd thermocouple is 600/1000 of the interval between the 3 rd thermocouple and the 4 th thermocouple; the fluctuation of the peak temperature position is large, and the up-and-down shift of the peak temperature position occurs, so that the condition that the fluctuation of the peak temperature position is large and the up-and-down shift of the peak temperature position is caused easily due to the fact that the oxygen content is improperly regulated by manually regulating the oxygen content set value is described.
By adopting the regeneration reactor oxygen content control method provided by the invention, the position data of the thermocouple measuring point and the measured temperature data of the thermocouple measuring point in the regeneration reactor are collected, and the peak temperature position prediction and the regulation and control of the oxygen content set value of the regeneration reactor are realized through the peak temperature position prediction model and the pre-established oxygen content controller, so that the peak temperature position and the narrow fluctuation of the peak temperature are stabilized. The concrete explanation is as follows:
1. peak temperature position prediction model
Model execution period: 60S;
inputting parameters: position data of the thermocouple measuring points and measured temperature data of the thermocouple measuring points;
output parameters: a combustion zone temperature peak value and a predicted value of a combustion zone peak temperature position.
2. Oxygen content controller
Module execution cycle: 60S;
inputting parameters: a target value of the peak temperature position of the combustion zone and a predicted value of the peak temperature position of the combustion zone;
output parameters: oxygen content set point.
After the peak temperature position prediction model and the oxygen content controller with the parameter settings are put into operation on site, the visual display of the distribution curve of the combustion temperature of the combustion zone along the axis of the regeneration reactor can be realized, and as shown in fig. 5, the existence of obvious peak temperature can be seen. Real-time display of combustion temperature peaks in a combustion zone can be realized, as shown in fig. 6, wherein the abscissa represents time, the coordinate value represents xx minutes xx seconds when xx is on the day xx, for example, 25:59:00 represents 59 minutes 00 seconds when 25 is on the day 20, and the ordinate represents temperature in DEG C; it can be seen that the peak temperature fluctuation range is small, and the fluctuation range is within the allowable range. Real-time display of the predicted peak temperature position value of the combustion area relative to the target peak temperature position value can be realized, as shown in fig. 7, wherein the target peak temperature position value is a constant value, the abscissa is time, the coordinate value represents xx minutes xx seconds when xx is on the day xx, for example, 25:59:00 represents 59 minutes 00 seconds when 25 is on the day 20, the ordinate is position, the coordinate value represents a specific position between two adjacent thermocouples, for example, 3.533 represents 533/1000 of a distance between the 3 rd thermocouple and the 4 th thermocouple and the 3 rd thermocouple; it can be seen that the peak temperature position fluctuates around the optimum target value, and the fluctuation range is small, and the fluctuation range is within the allowable range.
Specifically, as shown in fig. 8b, a schematic diagram of a process for adjusting a set value of oxygen content in a regeneration reactor after the regeneration reactor oxygen content control method is put into operation is provided, wherein the abscissa represents time, the coordinate value represents xx minutes xx seconds at xx day xx, for example, 25:59:00 represents 25 day 20 minutes 59 minutes 00 seconds, and the ordinate represents oxygen content; it can be seen that the adjustment process of the oxygen content set point fluctuates little and smoothly. As shown in fig. 9b, a distribution diagram of the peak combustion temperature in the combustion zone corresponding to the oxygen content set value adjustment process of fig. 8b is shown, wherein the abscissa represents time, the coordinate values represent xx-day xx-time xx minutes xx seconds, for example, 25:59:00 represents 25-day 20 minutes 00 seconds, and the ordinate represents temperature in degrees celsius; it can be seen that the narrow fluctuation of the peak temperature is stabilized, and the fluctuation range is within the allowable range. As shown in fig. 10b, a distribution diagram of the combustion peak temperature position of the combustion zone corresponding to the oxygen content set value adjustment process of fig. 8b is shown, wherein the abscissa is time, the coordinate value represents xx minutes xx seconds at xx sun xx, for example, 25:59:00 represents 59 minutes 00 seconds at 25 sun 20, the ordinate is peak temperature position, the coordinate value represents a specific position between two adjacent thermocouples, for example, 2.800 represents a position between the 2 nd thermocouple and the 3 rd thermocouple, and 800/1000,3.600 of the interval between the 2 nd thermocouple and the 3 rd thermocouple represents a position between the 3 rd thermocouple and the 4 th thermocouple, and the interval between the 3 rd thermocouple and the 3 rd thermocouple is 600/1000 of the interval between the 3 rd thermocouple and the 4 th thermocouple; it can be seen that narrow fluctuation of the peak temperature position is stabilized, the fluctuation range is within the allowable range, and no condition of shifting the peak temperature position up and down occurs.
The regeneration reactor oxygen content control method provided by the invention not only greatly reduces the labor intensity of on-site operators and realizes automatic optimization control, but also reduces the influence of parameter fluctuation caused by uncertain factors such as operator slackening, negligence or process.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.
In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the invention.
Claims (7)
1. A method for controlling the oxygen content of a regeneration reactor, comprising:
loading an operation peak temperature position prediction model and a pre-established oxygen content controller on line, and periodically controlling an oxygen content set value of the regeneration reactor;
in a control period, the peak temperature position prediction model outputs a peak temperature position prediction value according to position data of a thermocouple measuring point and measured temperature data of a thermocouple measuring point in a regeneration reactor, which are acquired in real time, and the oxygen content controller performs rolling optimization and feedback correction according to deviation between the peak temperature position prediction value and a set peak temperature position target value and outputs an oxygen content set value;
the oxygen content controller establishment process includes the steps of:
101. acquiring associated data of an oxygen content set value and a peak temperature position predicted value in a preset time period according to the peak temperature position predicted model, and carrying out model identification according to the associated data of the oxygen content set value and the peak temperature position predicted value to acquire an oxygen content control model;
102. configuring according to an oxygen content control model to obtain an oxygen content controller;
the transfer function expression of the oxygen content control model is:
，
in the method, in the process of the invention,peak temperature position->For oxygen content set point, < >>Is constant.
2. The method for controlling oxygen content of a regeneration reactor according to claim 1, further comprising, after loading the operation peak temperature position prediction model and the pre-established oxygen content controller on line, before controlling the oxygen content set point:
based on the peak temperature position prediction model, the oxygen content controller optimizes the operating variables, the control variables and the controller parameters on line according to the upper/lower limits of the set oxygen content values, the upper/lower limits of the peak temperature positions and the target values of the peak temperature positions.
3. The method according to claim 1, wherein the peak temperature position prediction model outputs a peak temperature position prediction value based on the position data of the thermocouple point and the measured temperature data of the thermocouple point in the regeneration reactor obtained in real time, comprising:
according to the position data of the thermocouple measuring points and the measured temperature data of the thermocouple measuring points, the measuring point positions and the measuring point temperatures are in one-to-one correspondence, and the associated data of the measuring point positions and the measuring point temperatures are obtained; interpolation processing is carried out on the related data of the measuring point position and the measuring point temperature, and a distribution curve of the combustion temperature along the axis of the regeneration reactor is obtained; and determining a peak temperature position predicted value according to the distribution curve.
4. The method for controlling oxygen content of a regeneration reactor according to claim 3,
and carrying out interpolation processing on the related data of the measuring point position and the measuring point temperature at set intervals by adopting a Lagrange quadratic interpolation method.
5. The regeneration reactor oxygen content control method according to claim 1, wherein 102 further comprises:
based on the peak temperature position prediction model, the oxygen content controller performs simulation running according to the upper/lower limit of the set oxygen content value, the upper/lower limit of the peak temperature position and the target value of the peak temperature position, and the controller parameters are debugged.
6. The method for controlling oxygen content of a regeneration reactor according to claim 2 or 5,
the control parameters comprise a smoothing coefficient of an oxygen content set value, an optimized maximum/minimum increment, a controlled maximum/minimum increment, a closed loop reference time of debugging peak temperature relative coordinates, an operation constraint upper/lower limit transition interval, an operation constraint upper/lower limit grade, a set value region upper/lower limit grade, an operation constraint upper/lower limit control equivalent deviation, a set value region upper/lower limit equivalent deviation, a gain constant and a time constant.
7. A regeneration reactor oxygen content control system, comprising:
the server is used for loading an operation peak temperature position prediction model and a pre-established oxygen content controller on line and periodically outputting an oxygen content set value of the regeneration reactor; in a period of outputting the oxygen content set value, the peak temperature position prediction model outputs a peak temperature position predicted value according to the position data of a thermocouple measuring point and the measured temperature data of a thermocouple measuring point in the regeneration reactor, which are obtained in real time, and the oxygen content controller performs rolling optimization and feedback correction according to the deviation between the peak temperature position predicted value and the set peak temperature position target value and outputs the oxygen content set value;
the oxygen content controller establishment process includes the steps of:
101. acquiring associated data of an oxygen content set value and a peak temperature position predicted value in a preset time period according to the peak temperature position predicted model, and carrying out model identification according to the associated data of the oxygen content set value and the peak temperature position predicted value to acquire an oxygen content control model;
102. configuring according to an oxygen content control model to obtain an oxygen content controller;
the transfer function expression of the oxygen content control model is:
，
in the method, in the process of the invention,peak temperature position->For oxygen content set point, < >>Is a constant;
and the DCS is used for controlling the regeneration reactor through a PID control loop according to the oxygen content set value written in by the server.
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