CN114700005A - Adaptive control method for variable number of reactors in PDH (chemical vapor deposition) process - Google Patents
Adaptive control method for variable number of reactors in PDH (chemical vapor deposition) process Download PDFInfo
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Abstract
The invention provides a self-adaptive control method with variable reactor number in a PDH (chemical vapor deposition) process, and relates to the technical field of propylene preparation by propane dehydrogenation. According to the control method provided by the invention, the condition that equipment is required to be put into operation after being overhauled can be avoided, and the time of the reactor working for one period and the interval starting time of the reactor are recalculated, so that the reactor which is not in fault can continuously operate. The method realizes the completion of on-line automatic detection, diagnoses the fault reactor, automatically switches the fault reactor to an off-line state, and automatically adjusts the cycle time and the interval starting time to continue the production, thereby avoiding the shutdown of the whole production line and ensuring the undisturbed continuous normal operation of the production. When the repaired reactor can work normally, the reactor is automatically switched to an online state and put into production again.
Description
Technical Field
The invention relates to the technical field of propylene preparation by propane dehydrogenation, in particular to a self-adaptive control method with variable reactor number in a PDH (chemical vapor deposition) process.
Background
PDH is the abbreviation of the process for preparing propylene by propane dehydrogenation, wherein a reaction unit consists of eight batch reactors, and each reactor has four tasks of purification, regeneration, vacuum pumping and dehydrogenation reaction. The process requirements are as follows: 1. the operation of three reactors in a dehydrogenation task is guaranteed at any time; 2. the time for the dehydrogenation task was 9 minutes. Obtaining an operation scheme that eight reactors simultaneously meet the process requirement 1 and the process requirement 2 through online calculation: each reactor was purged for 2 minutes and 2 seconds (hereinafter, referred to as 2 minutes), regenerated for 9 minutes and 2 seconds (hereinafter, referred to as 9 minutes), evacuated for 4 minutes and 1 second (hereinafter, referred to as 4 minutes), and dehydrogenated for 9 minutes and 1 second (hereinafter, referred to as 9 minutes), and a cycle sequence was repeated in this order for 24 minutes to run, and one reactor was started and run every 3 minutes, as shown in fig. 1. The purification of each reactor has 14 operations in 2 minutes, the regeneration has 14 operations in 9 minutes, the vacuum pumping has 20 operations in 4 minutes, the dehydrogenation has 1 operation in 9 minutes, and the four tasks are completed by 49 operations according to fixed time sequence and time, as shown in figures 2-5.
The applicant has found that the prior art has at least the following technical problems:
as can be seen from the state display chart of the circulation sequence in FIG. 1, the running states of 1-8 reactors and four tasks of purification, regeneration, vacuumizing and dehydrogenation reaction are related in one period. The time required for completing each task has a corresponding value on a time axis, three reactors are guaranteed to run in the dehydrogenation task at any time, the time of the dehydrogenation task is 9 minutes, one reactor is started to run every 3 minutes, and the period of each reactor is 24 minutes.
From the periodic time sequence table of FIGS. 2 to 5, it can be seen that the fixed sequence relationship of 49 operations for completing four tasks of 2 minutes and 14 operations for each reactor, 9 minutes and 14 operations for regeneration, 4 minutes and 20 operations for evacuation, 9 minutes and 1 operation for dehydrogenation, and the fixed time required for completing each operation are all completed. In fig. 2 to 5, operation number 1 is the first reactor to be started, operation number 7 is the second reactor to be started, operation number 6 is the third reactor to be started, operation number 4 is the fourth reactor to be started, operation number 5 is the fifth reactor to be started, operation number 3 is the sixth reactor to be started, operation number 2 is the seventh reactor to be started, and operation number 8 is the eighth reactor to be started. In the periodic time list formed by fig. 2-5, the time count starts at 1 when 1441 seconds.
When any one or two or even three of the eight reactors which normally run on line have faults, because the task time, the operation time and the period are fixed according to the running scheme of the eight reactors and cannot adapt to the running scheme of seven or six or even five reactors, all units of the process flow of the whole production line must be stopped and only can be put into operation after maintenance treatment, so that each reactor needs to be maintained for at least one more month or even longer, serious loss is caused to the yield, quality and energy consumption of production, and hidden danger is brought to safety.
Disclosure of Invention
The invention aims to provide an adaptive control method with variable reactor number in a PDH process, which aims to solve the problems. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a self-adaptive control method with variable reactor number in a PDH process, which comprises the following steps: detecting whether the reactor has a fault; if the reactor fails, recalculating the time of one working period of the reactor and recalculating the interval starting time of the reactor; and controlling the reactors which are not failed to work according to the calculated cycle time, and controlling the reactors which are not failed to start in sequence according to the calculated interval starting time.
Further, the method specifically comprises the following steps: detecting whether the reactor has a fault, and if the reactor has the fault, controlling the reactor with the fault to be switched to an offline state; when a faulty reactor is detected, recalculating the time of one cycle of reactor operation and recalculating the reactor interval start-up time; when a fault reactor is detected, controlling the started reactors to work for a period, controlling the un-started reactors to pause for starting, then controlling all the un-fault reactors to work according to the calculated period time and controlling all the un-fault reactors to start in sequence according to the calculated interval starting time.
Further, when the fault reactor is repaired, the fault reactor is automatically switched to an online state; controlling the started reactors to work for one period, controlling the started reactors to pause, then controlling all the reactors to work according to the previous period time and controlling all the reactors to start in sequence according to the previous interval starting time.
Further, the time of one cycle of reactor operation and the reactor interval start-up time are calculated as follows: determining the number of non-fault reactors; calculating the time T of one working period of the reactor and the interval starting time Deltat of the reactor according to the number of the non-fault reactors, wherein,
y: dehydrogenation reaction time in one cycle; x 0: the number of the non-fault reactors is counted; x: the number of reactors which simultaneously run in the dehydrogenation reaction task is ensured.
Further, controlling the non-failed reactor to operate according to the calculated cycle time comprises: determining the time t1 of the purification task, the time t2 of the regeneration task and the time t3 of the vacuumizing task in one period of the reactor; the non-failed reactor is periodically operated according to the purification task time t1, the regeneration task time t2, the vacuumizing task time t3 and the dehydrogenation reaction task time y.
Further, with respect to the determination of the time t1 of the cleaning task, the time t2 of the regeneration task, and the time t3 of the evacuation task within one cycle of the reactor, the following are included:the time t1 is a function of the number of operating faultless reactors x0, i.e.
(ii) a The time t2 is a function of the number of operating faultless reactors x0, i.e.
(ii) a The time t3 is a function of the number of operating faultless reactors x0, i.e.
。
Further, the number of non-failed reactor runs x0 is not less than the minimum number specified by the process.
Further, the operation of the non-failed reactor according to the cleaning task time t1, the regeneration task time t2 and the vacuum task time t3 comprises the following contents: the cleaning task comprises N1 operations, the regeneration task comprises N2 operations, the vacuumizing task comprises N3 operations, the time used by each operation in the N1 operations is calculated, the time used by each operation in the N2 operations is determined, and the time used by each operation in the N3 operations is determined; controlling the non-failed reactor to operate according to the calculated time for each of the N1 operations, the calculated time for each of the N2 operations, and the calculated time for each of the N3 operations.
Furthermore, the time used by each operation in the N1 operations is a function of t1 and is a composite function of the number of non-failed reactors x0, the time used by each operation in the N2 operations is a function of t2 and is a composite function of the number of non-failed reactors x0, and the time used by each operation in the N3 operations is a function of t3 and is a composite function of the number of non-failed reactors x 0.
Further, with respect to the dehydrogenation reaction time y within one cycle, y is constant or variable during the process, and when y is not constant, y is a function of x0, i.e., y is a constant
(ii) a There are only 1 operation in the dehydrogenation task, and the time taken for 1 operation is the dehydrogenation reaction time y.
The invention has the following beneficial effects: the invention provides a self-adaptive control method with variable reactor number in a PDH process, which can avoid the condition that equipment needs to be put into operation after being overhauled, only needs to recalculate the time of one working period of the reactor and recalculate the interval starting time of the reactor, and simultaneously ensures that N (the number N is the process specified requirement) reactors operate in a dehydrogenation reaction task at any time, so that the faultless reactors continue to operate. The method realizes the completion of on-line automatic detection, diagnoses the fault reactor, automatically switches the fault reactor to an off-line state, and automatically adjusts the cycle time and the interval starting time to continue the production, thereby avoiding the shutdown of the whole production line and ensuring the undisturbed continuous normal operation of the production.
When the repaired reactor can work normally, the reactor is automatically switched to an on-line state and put into production again, at the moment, the started reactor is controlled to work for a period, the reactor which is not started is controlled to be stopped to start, then all the reactors are controlled to work according to the previous period time and all the reactors are controlled to start in sequence according to the previous interval starting time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a timing diagram of the cycle of eight reactors provided in an example of the present invention (time on the abscissa and numbers 1-8 on the ordinate);
FIG. 2 is a sequence chart of the cycle times (operation numbers 1 to 12) when eight reactors according to the embodiment of the present invention are operated;
FIG. 3 is a periodic time sequence chart (operation numbers 13 to 26) of eight reactors according to an embodiment of the present invention;
FIG. 4 is a periodic time sequence chart (operation numbers 27 to 40) of eight reactors according to an embodiment of the present invention;
FIG. 5 is a periodic time sequence chart (operation numbers 41 to 49) of eight reactors according to an embodiment of the present invention;
FIG. 6 is a timing diagram of a cycle of seven reactors (seven reactors numbered 1-7 are shown on the abscissa for time and on the ordinate) according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As described in the background art, in the prior art, in the operating scheme of eight reactors, each task time, each operation time and each cycle are fixed, and cannot adapt to the operating scheme of seven or six or even five reactors, each unit of the process flow of the whole production line must be stopped, and the process flow can only be put into operation after waiting for maintenance treatment, so that each reactor needs to be maintained for at least one more month or even longer, thereby causing serious loss to the yield, quality and energy consumption of production and bringing about potential safety hazards.
Based on the above, the invention provides a self-adaptive control method with variable reactor number in a PDH process, which comprises the following steps: detecting whether the reactor has a fault; if the reactor fails, recalculating the time of one working period of the reactor and recalculating the interval starting time of the reactor; and controlling the reactors which are not failed to work according to the calculated cycle time, and controlling the reactors which are not failed to start in sequence according to the calculated interval starting time. According to the control method provided by the invention, the condition that equipment needs to be put into operation after being overhauled can be avoided, the time of one working period of the reactor only needs to be recalculated, the interval starting time of the reactor only needs to be recalculated, and meanwhile, N (the quantity N is the process specified requirement, such as three) reactors are ensured to operate in the dehydrogenation task at any time, so that the reactor which does not fail continues to operate.
The self-adaptive control method with the variable number of reactors in the PDH process specifically comprises the following steps: detecting whether a reactor (in operation) has a fault or not, and if the reactor (in operation) has the fault, controlling the reactor with the fault to be switched into an off-line state (the off-line state is a state not participating in work); when a faulty reactor is detected, recalculating the time of one cycle of reactor operation and recalculating the reactor interval start-up time; when a fault reactor is detected, controlling the started reactors to work for a period, controlling the un-started reactors to pause for starting, then controlling all the un-fault reactors to work according to the calculated period time and controlling all the un-fault reactors to start in sequence according to the calculated interval starting time. The method realizes the completion of on-line automatic detection, diagnoses the fault reactor, automatically switches the fault reactor to an off-line state, and automatically adjusts the cycle time and the interval starting time to continue the production, thereby avoiding the shutdown of the whole production line and ensuring the undisturbed continuous normal operation of the production.
When the repaired reactor can work normally, the reactor is automatically switched to an on-line state and put into production again, at the moment, the started reactor is controlled to work for a period, the reactor which is not started is controlled to be stopped to start, then all the reactors are controlled to work according to the previous period time and all the reactors are controlled to start in sequence according to the previous interval starting time.
With respect to the time of one cycle of reactor operation and the reactor interval start-up time, the calculation method is as follows:
determining the number of non-failed reactors; calculating the time T of one working period of the reactor and the interval starting time Deltat of the reactor according to the number of the non-fault reactors, wherein,
y: dehydrogenation reaction time within one cycle (y is usually constant during the process);
x 0: the number of the operating reactors which are not in fault (the number x0 of the operating reactors which are not in fault is not less than the minimum value specified by the process, and when the number x0 of the operating reactors which are not in fault is less than the minimum value specified by the process, the production line stops working);
x: the number of reactors which are simultaneously operated for the dehydrogenation task (x is usually constant during the process).
With regard to controlling the operation of the non-failed reactor according to the calculated cycle time, the following are included:
determining the time t1 of the purification task, the time t2 of the regeneration task and the time t3 of the vacuumizing task in one period of the reactor; the non-failed reactor is periodically operated according to the purification task time t1, the regeneration task time t2, the vacuumizing task time t3 and the dehydrogenation reaction task time y.
With regard to the determination of the time t1 for the cleaning task, the time t2 for the regeneration task and the time t3 for the evacuation task within one cycle of the reactor, the following are included:
the time t1 is a function of the number of operating faultless reactors x0, i.e.
I.e. by
The time t2 is a function of the number of operating failed reactors x0, i.e.
I.e. by
The time t3 is a function of the number of operating failed reactors x0, i.e.
I.e. by
The mathematical model between t1 and x0, the functional relationship between t2 and x0, and the mathematical model between t3 and x0 can be derived by the provided data analysis.
The following are included with regard to the operation of the non-failed reactor according to the cleaning task time t1, the regeneration task time t2 and the evacuation task time t 3: the cleaning task comprises N1 operations, the regeneration task comprises N2 operations, the vacuumizing task comprises N3 operations, the time used for determining each operation in the N1 operations is calculated, the time used for each operation in the N2 operations is determined, and the time used for each operation in the N3 operations is determined; the non-failed reactor was controlled to operate according to the calculated time for each of the N1 operations, the time for each of the N2 operations, and the time for each of the N3 operations.
The time taken for each of the N1 operations was a function of t1, a composite function of the number of non-failing reactors operating x0, the time taken for each of the N2 operations was a function of t2, a composite function of the number of non-failing reactors operating x0, the time taken for each of the N3 operations was a function of t3, a composite function of the number of non-failing reactors operating x 0.
N1 may be 14, of course, N1 is not limited to 14, depending on the process requirements, see the following equation: with N1 at 14, the time taken for each of the N1 operations is a non-linear function of the purge task time t 1. there is a functional relationship between t1 and x0, so the time taken for each of the N1 operations is a function of the number of non-failing reactors operating, x 0:
N2 may be 14, of course, N2 is not limited to 14, depending on the process requirements, see the following equation: when N2 is 14, the time taken for each of the N2 operations is a non-linear function of the regeneration task time t 2. there is a functional relationship between t2 and x0, so the time taken for each of the N2 operations is a function of the number of non-failing reactors operating, x 0:
N3 may be 20, but N3 is not limited to 20, depending on the process requirements, see the following equation: when N3 is 20, the time taken for each of the N3 operations is a non-linear function of the evacuation task time t 3. there is a functional relationship between t3 and x0, so the time taken for each of the N3 operations is a function of the number of non-failing reactors operating, x 0:
wherein the content of the first and second substances,
for the time taken for the first of the N3 operations,
the time used for the second of the N3 operations,
the time taken for the twentieth operation of the N3 operations. Wherein the content of the first and second substances,
、
、...、
all are constant values, and are obtained by data regression processing of a set of different t3 values and corresponding different y (3,1) values provided by a technician.
、
、…、
All are constant values, and are obtained by data regression processing of a set of different t3 values and corresponding different y (3,2) values provided by a technician. …
、
、…、
All are constant values, and are obtained by data regression processing of a set of different t3 values and corresponding different y (3,20) values provided by a technician.
A mathematical model between the time spent for each of N1 operations and x0, a mathematical model between the time spent for each of N2 operations and x0, and a mathematical model between the time spent for each of N3 operations and x0 can be derived from the provided data analysis.
The dehydrogenation reaction time y in one cycle is explained as follows: y is constant or variable during the process, and when y is not constant, y is a function of x0, i.e.
I.e. by
The following is concretely explained (taking eight reactors as an example, three reactors are ensured to operate in a dehydrogenation task at any time, and the dehydrogenation reaction time of each reactor is a certain value):
each reactor has four tasks of purification, regeneration, vacuum pumping and dehydrogenation reaction. And 2 minutes of purification task, 9 minutes of regeneration task, 4 minutes of vacuumizing task and 9 minutes of dehydrogenation reaction of each reactor are taken as a fixed period, the reactors are operated in a cycle time sequence repeatedly according to the task sequence, and one reactor is started and operated every 3 minutes.
The purification task of each reactor was 14 operations for 2 minutes, the regeneration task was 14 operations for 9 minutes, the evacuation task was 20 operations for 4 minutes, and the dehydrogenation reaction was 1 operation for 9 minutes, and the four tasks were completed by 49 operations in total at fixed timings and times, as shown in fig. 2 to 5.
When one reactor fails, the seven reactors are obtained through online calculation and simultaneously meet the following process requirements: each reactor is 1.5 minutes for purification task t1, 8 minutes for regeneration task t2, 2.5 minutes for evacuation task t3, 9 minutes for dehydrogenation y, and a fixed period of 21 minutes is set, and the reactor is operated cyclically according to the task timing sequence, and is started every 3 minutes, as shown in fig. 6.
Meanwhile, the time for purifying each reactor for 1.5 minutes has 14 operations, regenerating for 8 minutes has 14 operations, vacuumizing for 2.5 minutes has 20 operations, and dehydrogenating for 9 minutes has 1 operation is changed correspondingly along with the change of the calculation result of the mathematical model.
With respect to the periodic time sequence table, see fig. 2-5, fig. 2-5 form a table, the first row in fig. 2-5 is a header, in which the columns a, B, C, D, E, F, G, H, I and J are arranged from left to right, in the columns C, D, E, F, G, H, I, and J, 1 to 8 sequentially indicate the 1# reactor, 2# reactor, 3# reactor, 4# reactor, 5# reactor, 6# reactor, 7# reactor, and 8# reactor, and the column B indicates the time of each operation (for example, the 2 nd operation is a reset steam counter, and when 2 seconds, the reset steam counter takes 4 seconds, so that after 4 seconds, that is, the sixth second, the third operation is performed, and the steam purge valve is opened). In column A, the operation numbers from 1 to 49 are, in order, closing the HC inlet valve, resetting the steam counter, opening the steam purge valve, testing the HC inlet valve has been closed, testing the steam purge valve has been opened, testing the steam counter, closing the steam purge valve, testing the steam purge valve has been closed, closing the HC outlet valve, testing the HC outlet valve has been closed, opening the air inlet valve, opening the air sampling valve, testing the reactor pressure, opening the air outlet valve, testing the air outlet valve has been opened, testing the air inlet valve has been opened, opening the shower purge valve, testing the shower purge valve has been opened, closing the shower purge valve, testing the shower purge valve has been closed, opening the gas jet valve, testing the gas jet valve has been opened, closing the air sampling valve, closing the gas injection valve, testing the gas jet valve has been closed, opening the shower purge valve, testing the shower purge valve has been opened, Closing the spray purge valve, testing the spray purge valve closed, closing the air inlet valve, testing the air inlet valve closed, closing the air outlet valve, testing the air outlet valve closed, testing the evacuation exhaust head pressure, opening the evacuation exhaust valve, testing the evacuation exhaust valve open, resetting the regeneration gas counter, testing the reactor vacuum, opening the regeneration air valve, testing the regeneration air valve open, testing the regeneration air counter reset, closing the regeneration air valve, testing the regeneration air valve closed, closing the evacuation exhaust valve, testing the evacuation exhaust valve closed, opening the HC outlet valve, testing the HC outlet valve open, opening the HC inlet valve, testing the HC inlet valve open.
The reactor No. 1 is a first reactor to be started, the reactor No. 7 is a second reactor to be started, the reactor No. 6 is a third reactor to be started, the reactor No. 4 is a fourth reactor to be started, the reactor No. 5 is a fifth reactor to be started, the reactor No. 3 is a sixth reactor to be started, the reactor No. 2 is a seventh reactor to be started, and the reactor No. 8 is an eighth reactor to be started. In the periodic time list formed by fig. 2-5, when 1441 seconds is reached, the time count will start at 1.
The start-up time for the first started # 1 reactor is from row 2, column C in fig. 2. Second 1: the first operation "close HC inlet valve" takes 1 second. The purge time was 123 seconds minus 1 second and equal to 122 seconds (generally 2 minutes). Second 2: the second operation "reset steam counter" takes 4 seconds. And 6, second: the third operation "open the steam purge valve" takes 2 seconds. … second 123 it took 1 second for the fifteenth operation to "test the air outlet valve has opened". The regeneration time was 661 seconds minus 123 seconds and 538 seconds (generally 9 minutes). … st 661 seconds it took 4 seconds for the twenty ninth operation to test that the spray purge valve has closed. The evacuation took 900 seconds minus 611 seconds equal to 239 seconds (collectively 4 minutes). …, 900 th second: the forty-ninth operation was "test HC inlet valve open", which took 541 seconds. The total time is 900 seconds plus 541 seconds which equals 1441 seconds minus the period 1440 seconds which equals 1 second, and the next period cycle is entered to start the cycle sequence.
Referring to fig. 2, the start-up time for the second start-up reactor # 7 was 181 seconds from row 2, column I, after start-up of the reactor # 1. The start-up time for the third reactor # 6 started was 361 seconds later than that for the reactor # 1 from row 2, column H. The start-up time for the fourth start-up reactor # 4 was 541 seconds later than the start-up time for the reactor # 1 from row 2, column F. The start-up time for the fifth start-up reactor # 5 was 721 seconds later than the start-up of the reactor # 1 from line 2, column G. The start-up time for the sixth reactor # 3 started 901 seconds later than the start of the reactor # 1 from row 2, column E. The start-up time for the seventh start-up reactor # 2 was 1081 seconds later than the start-up time for the reactor # 1, starting at row 2, column D. The start-up time for the eighth reactor # 8 started is 1261 seconds later than the start-up of the reactor # 1 from row 2, column J.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An adaptive control method for changing the number of reactors in a PDH process is characterized by comprising the following steps:
detecting whether the reactor has a fault;
if the reactor fails, recalculating the time of one working period of the reactor and recalculating the interval starting time of the reactor;
and controlling the reactors which are not failed to work according to the calculated cycle time, and controlling the reactors which are not failed to start in sequence according to the calculated interval starting time.
2. An adaptive control method for reactor number variation in a PDH process as defined in claim 1, which specifically comprises the following:
detecting whether the reactor fails or not, and controlling the failed reactor to be switched to an offline state if the reactor fails;
when a faulty reactor is detected, recalculating the time of one cycle of reactor operation and recalculating the reactor interval start-up time;
when a fault reactor is detected, controlling the started reactors to work for a period, controlling the un-started reactors to pause for starting, then controlling all the un-fault reactors to work according to the calculated period time and controlling all the un-fault reactors to start in sequence according to the calculated interval starting time.
3. An adaptive control method for reactor number variation in a PDH process as defined in claim 2, wherein a failed reactor is automatically switched to an on-line state after completion of its repair;
controlling the started reactors to work for one period, controlling the started reactors to pause, then controlling all the reactors to work according to the previous period time and controlling all the reactors to start in sequence according to the previous interval starting time.
4. An adaptive control method for reactor number variation in a PDH process as defined in any one of claims 1-3, wherein the time for one cycle of reactor operation and reactor interval start-up time calculation:
determining the number of non-failed reactors;
calculating the time T of one working period of the reactor and the interval starting time Deltat of the reactor according to the number of the non-fault reactors, wherein,
y: dehydrogenation reaction time in one cycle;
x 0: the number of the non-fault reactors is counted;
x: the number of the reactors which simultaneously run in the dehydrogenation reaction task is ensured.
5. An adaptive control method for reactor number variation in a PDH process as defined in claim 4, wherein the operation of the control-faultless reactor according to the calculated cycle time comprises the following:
determining the time t1 of the purification task, the time t2 of the regeneration task and the time t3 of the vacuumizing task in one period of the reactor;
the non-failed reactor is periodically operated according to the purification task time t1, the regeneration task time t2, the vacuumizing task time t3 and the dehydrogenation reaction task time y.
6. An adaptive control method for the variable number of reactors in a PDH process according to claim 5, wherein the following are included with respect to the determination of the time t1 for the cleaning duty, the time t2 for the regeneration duty and the time t3 for the evacuation duty within one period of the reactor:
the time t1 is a function of the number of operating faultless reactors x0, i.e.
；
The time t2 is a function of the number of operating faultless reactors x0, i.e.
；
The time t3 is a function of the number of operating faultless reactors x0I.e. by
。
7. An adaptive control method for the number of reactors in a PDH process as defined in claim 6, wherein the number of non-failed reactors x0 is not less than the minimum value specified by the process.
8. An adaptive control method for reactor count variation in a PDH process as defined in claim 5, wherein the non-failed reactor operating according to the cleaning duty time t1, the regeneration duty time t2 and the vacuum duty time t3 comprises the following:
the purification task comprises N1 operations, the regeneration task comprises N2 operations, the vacuumizing task comprises N3 operations,
calculating a time taken to determine each of the N1 operations, determining a time taken to determine each of the N2 operations, and determining a time taken to determine each of the N3 operations;
controlling the non-failed reactor to operate according to the calculated time for each of the N1 operations, the calculated time for each of the N2 operations, and the calculated time for each of the N3 operations.
9. An adaptive control method for varying the number of reactors in a PDH process as defined in claim 8 wherein the time taken for each of the N1 operations is a function of t1 and a composite function of the number of non-failed reactors operating x0, the time taken for each of the N2 operations is a function of t2 and a composite function of the number of non-failed reactors operating x0, and the time taken for each of the N3 operations is a function of t3 and a composite function of the number of non-failed reactors operating x 0.
10. The adaptive control method for reactor number variation in PDH process as defined in claim 4, whereinThus, with respect to the dehydrogenation reaction time y within a cycle, y is constant or variable during the process, and when y is not constant, y is a function of x0, i.e., y is a constant
；
There are only 1 operation in the dehydrogenation task, and the time taken for 1 operation is the dehydrogenation reaction time y.
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