CN115097876A - Cascade fixed-width multivariable decoupling discrete control debenzolization tower top temperature system - Google Patents
Cascade fixed-width multivariable decoupling discrete control debenzolization tower top temperature system Download PDFInfo
- Publication number
- CN115097876A CN115097876A CN202210675709.6A CN202210675709A CN115097876A CN 115097876 A CN115097876 A CN 115097876A CN 202210675709 A CN202210675709 A CN 202210675709A CN 115097876 A CN115097876 A CN 115097876A
- Authority
- CN
- China
- Prior art keywords
- value
- period
- tower top
- debenzolization tower
- top temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 claims abstract description 46
- 238000005070 sampling Methods 0.000 claims abstract description 32
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 72
- 238000007667 floating Methods 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 238000010992 reflux Methods 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 230000005856 abnormality Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 238000012824 chemical production Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001311 chemical methods and process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
Abstract
The invention relates to the field of debenzolization tower top temperature control. A series-level fixed-width multivariable decoupling discrete regulation and control debenzolization tower top temperature system is realized by a PLC (programmable logic controller), and comprises an input interface design, an output interface design, a middle quantity design, a sampling period module design, a starting module design and an automatic control algorithm rule module design. The defects of traditional PID adjustment and existing manual adjustment are perfectly overcome, so that the control level of the chemical production process parameters is greatly improved, and the actual process production needs are met.
Description
Technical Field
The invention relates to the field of debenzolization tower top temperature control.
Background
The temperature control at the top of the debenzolization tower is an important debenzolization process parameter control index, the quality of the temperature control can directly influence the quality of crude benzene of a process product, and the process production requires that the temperature fluctuation does not exceed +/-2 ℃. The prior process parameter control system adopts the traditional closed-loop PID continuous regulation control technology, along with the growth of the age, the regulation effect is not ideal in the actual process production, has higher requirements on the production process, the controlled object, the execution link, the feedback link precision, the experience of operators and the skill level, can not well meet the production requirements of the actual process, in addition, after the transmission PID closed loop continuous regulation control technology is adopted, the fluctuation of the temperature index at the top of the debenzolization tower is large, the temperature at the top of the debenzolization tower becomes divergent or vibrates in a constant amplitude manner on a target value line for a long time, the system control is extremely unstable, production accidents are easy to cause, the process index is suddenly high and suddenly low, the standard reaching rate of products is low, and then post workers adjust to manual control, but also wastes time and labor, has the defects of untimely and unstable regulation and control, different control indexes and large control fluctuation, and is not beneficial to practical application.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to overcome the defects of the traditional PID adjusting method, the design and development of the cascade fixed-width multivariable decoupling discrete regulation and control system is realized based on the field PLC, the defects of the traditional PID adjustment and the existing manual adjustment are overcome, the control level of the chemical production process parameters is greatly improved, and the actual process production needs are met.
The technical scheme adopted by the invention is as follows: a series-level fixed-width multivariable decoupling discrete regulation debenzolization tower top temperature system is realized through a PLC and comprises an input interface design, an output interface design, a middle quantity design, a sampling period module design, a starting module design and an automatic control algorithm rule module design, and the system is concretely as follows
Designing an input interface:
selecting model _ manul _ auto in a manual and automatic mode, automatically controlling to start a start, automatically controlling to stop a stop, Real-time feedback value Real _ PV of the temperature of the top of the debenzolization tower, center Line Sp _ Centre _ Line of the temperature of the top of the debenzolization tower, minimum opening min _ open of a light benzene reflux stop valve and a steam pressure stop valve, maximum opening max _ open of the light benzene reflux stop valve and the steam pressure stop valve, and types of the light benzene reflux stop valve and the steam pressure stop valve;
output interface design
Controlling the temperature of the top of the debenzolization tower to adjust a threshold value out _ adjust, opening the light benzene reflux stop valve and the steam pressure stop valve to a minimum stop opening alarm out _ loweralarm, and opening the light benzene reflux stop valve and the steam pressure stop valve to a maximum stop opening alarm out _ highalarm;
design of intermediate quantity
Manually/automatically inputting and outputting an intermediate output quantity out _ temp, starting a control operation command to output run _ out, reaching a pulse output reach _ set _ period of a set period value, outputting one _ second _ pulse _ out, adding an intermediate quantity inter _ amplitude, setting an upper limit floating value set _ upper level of the debenzolization tower top temperature, setting a lower limit floating value set _ lowlimumab of the debenzolization tower top temperature, setting a real-time sampling period set _ sample _ period of the debenzolization tower top temperature, automatically controlling a lower regulating valve to output an automatically regulated floating value set _ upper _ value, automatically controlling a lower regulating valve to output an automatically regulated and reduced floating value out _ lowerwadjective _ value, executing a program to display in real time to reach the intermediate quantity of a sampling period, displaying an upper limit value of the debenzolization tower top temperature after being set, displaying a lower limit value of the debenzolization tower top temperature after being set, displaying a maximum sampling period value of a clock period, and setting a maximum sampling period value;
sample period module design
Through a reference cycle period T0 of the PLC, T0=100ms, a prescale factor clock _ prescaler of a reference clock period with a default value of 10.0, 10 frequency division can be realized, the clock _ prescale T0=10 × 100ms =1000ms = 1s, a sampling reference period T1 with the reference period of 1s is obtained, the actual sampling period is set according to the requirement of an actual process system by using a formula Sample _ Time = a × T1, a is an actual engineering coefficient, and the range is 0-max _ Sample _ period, and max _ Sample _ period is a maximum sampling period value; when a fault or misoperation occurs outside the system, the parameter set _ sample _ period < =0 or set _ sample _ period > max _ sample _ period in the sampling period module, namely an abnormality occurs, then the sampling period module automatically performs zero clearing, namely set _ sample _ period = 0; to ensure safety;
start-up module design
When an operator presses an automatic start, the control system starts to operate and take over the tracking, regulation and control and monitoring of the temperature at the top of the debenzolization tower, manual intervention is not needed, the system program automatically operates, if the automatic operation mode needs to be cancelled, the control system automatically releases the hosting and stores all the data parameters executed at the last time and transmits the data parameters to the operator only by pressing the automatic control stop, so that the control of the whole process system is ensured to be in smooth and orderly transition, and potential safety hazards are prevented;
automatic control algorithm rule module design
The module is based on an automatic mode, when an operator presses an automatic start, the tracking, regulation and control and monitoring of the temperature index of the top of the debenzolization tower are started in full-automatic operation without manual intervention, and the full-automatic control algorithm of the system is as follows
Obtaining the program automatic intervention condition according to a preset parameter value of an Sp _ Centre _ Line of the debenzolization tower top temperature, a set _ uplimtscale upper limit floating value of the debenzolization tower top temperature and a set _ lowimtscale upper limit floating value of the debenzolization tower top temperature: namely, displaying an upper limit value uplimiter = Sp _ center _ Line + set _ uplimtscale after the upper limit value of the debenzolization tower top temperature is set, as an upper trigger limit of the debenzolization tower top temperature, displaying a lower limit value lowmarker of the debenzolization tower top temperature after the upper limit value is set, as a lower trigger limit of the debenzolization tower top temperature, when a pulse output reach _ set _ period signal of a set period value is reached, automatically judging if Real _ PV > uplimiter, out _ temp = out _ temp + out _ adjust _ value, if Real _ PV < lowimiter, out _ temp = out _ warm _ out _ adjust _ value, simultaneously performing abnormal signal check, if out _ temp < = min _ open _ default, temp = out _ alarm, and alerting operation personnel to alarm, if operation _ alarm is set, reminding a post operator to pay attention, and if no abnormity exists, finally intervening the controlled variable by the out _ adjust = out _ temp to make the controlled variable return to the normal range value, and if the automatic operation mode needs to be cancelled, manually intervening, only needing the operator to press the automatic stop button, the control system automatically removes the trusteeship, and completely stores and transmits the last executed data parameters to the operator, thereby ensuring the stable and orderly control transition of the whole process system and preventing the generation of potential safety hazards.
The invention has the beneficial effects that: the on-site PLC meets the production requirement of an actual process, so that the continuous and stable control of chemical process parameters is realized, the qualified standard rate and the production efficiency of products are improved, the occurrence of production accidents is reduced, and the stable and controlled process production system is ensured. The defects of the traditional PID adjustment and the existing manual adjustment are perfectly overcome, so that the control level of the chemical production process parameters is greatly improved, and the actual process production needs are met.
Drawings
FIG. 1 is a flow diagram of a debenzolization process.
Detailed Description
The control system is applied to the chemical production process system of a coking plant of Shanxi Tai Steel stainless Steel Limited company, the control system is firstly applied to the temperature control (the yellow part in the following table) at the top of the debenzolization tower in a chemical production operation area (south area), because the temperature is an important debenzolization process parameter control index, the quality of the temperature control can directly influence the crude benzene quality of a process product, the process production requires that the temperature fluctuation does not exceed +/-2 ℃, and the specific process requirements are described as follows:
1. debenzolizing tower
1.1 function: after heating in tubular furnace, the crude benzene fraction in rich oil is distilled out by overheat steam blown from bottom of the tower, the evaporated crude benzene is condensed and cooled, after oil-water separation, one part of the crude benzene is reflux, and the rest is used as product.
1.2 management items and Standard values thereof
2. The regulation and control system is put into use, and a hardware processor and parameter setting and application effects adopted by the system are as follows:
1. input/output interface module design of regulation and control system
1) The system input interface is designed as follows:
model _ manul _ auto (manual automatic mode selection, boolean type, initial value of False), start (automatic control start, boolean type, initial value of False), stop (automatic control stop, boolean type, initial value of False), Real _ PV (Real value feedback value of debenzolization tower top temperature, Real value type, initial value of 0.0), Sp _ center _ Line (debenzolization tower top temperature center Line, Real value type, initial value of 0.0), min _ open _ default (minimum cut-off opening, Real value type, initial value of 0.0), max _ open _ default (maximum cut-off opening, Real value type, initial value of 100.0), adjust _ pos _ nag _ effect (adjustment valve type selection, boolean type, initial value of False, i.e. default open valve);
2) the system output interface is designed as follows:
out _ adjust (output controlled adjustment threshold, real number type, initial value of 0.0), out _ loweralarm (adjustment valve to minimum cut-off alarm, boolean type, initial value of False),
out _ highhalarm (alarm of boolean type with the regulating valve open to maximum cut-off, initial value False),
3) the system input and output interface is designed as follows:
out _ temp (intermediate output of manual/automatic input/output, which is an interface of manual/automatic input), run _ out (start control operation command output, boolean type, initial value of False), reach _ set _ period (pulse output reaching a set period value, boolean type, initial value of False), one _ second _ pulse _ out (second pulse output, boolean type, initial value of False), intermedium _ accumulator (intermediate accumulation amount, integer type, initial value of 0), set _ uplimscale (set upper floating value of debenzolization tower top temperature center line, real type, initial value of 1.0), set _ limitstale (set lower floating value of debenzolization tower top temperature center line, real type, initial value of 1.0), sample _ period, integer type, initial value of 2), add _ value (set debenzolization tower top temperature real sampling period, floating amount of automatic output, floating amount of regulating valve, real number type, initial value 0.5), out _ lowjust _ value (floating amount of automatic regulation and reduction of regulating valve output under automatic control, real number type, initial value 0.5), stepnums (program execution real-time display of middle amount of reaching sampling period, integer type, initial value 0), uplimiter (displaying upper limit value of debenzolization tower top temperature central line after setting up, real number type, initial value 0.0), lowimiter (displaying lower limit value of debenzolization tower top temperature central line after setting up, real number type, initial value 0.0) clock _ prescaler (pre-division factor of reference clock period, integer type, initial value 10), max _ sample _ period range (setting up maximum sampling period range, automatic zero clearing when exceeding this range, integer type, initial value 0)
2. Control algorithm module design of control system
1) Designing a system sampling period module:
the hardware reference cycle period T0 of the PLC control system is within a range of 0-100ms, (most PLC programmable logic controllers in the market generally can provide the hardware reference cycle period within the range), the system adopts T0=100ms, the default value of a prescaler of the reference clock period of the system is 10.0, 10 frequency division can be realized, the clock _ prescaler T0=10 100ms =1000ms = 1s, the sampling reference period T1 with the reference period of 1s can be obtained, the actual sampling period is set according to the formula Sample _ Time = a T1, a is an actual engineering coefficient, and the range is 0-max _ Sample _ period (maximum sampling period value) according to the actual process system requirement; when a fault or misoperation occurs outside the system, the parameter set _ sample _ period < =0 or set _ sample _ period > max _ sample _ period in the sampling period module is caused, namely an abnormality occurs, then the sampling period module can automatically execute zero clearing, namely set _ sample _ period = 0; the safety is ensured.
2) Designing a starting module of the regulating system:
the module is based on an automatic mode, when an operator presses an automatic start button, a control system starts to operate to take over the tracking, regulation and control and monitoring of certain process parameter indexes, manual intervention is not needed, system programs automatically operate, if the automatic operation mode needs to be cancelled, the control system can automatically remove trusteeship only after the operator presses an automatic stop button, and finally executed data parameters are all stored and transmitted to the operator, so that the stable and orderly control transition of the whole process system is ensured, and potential safety hazards are prevented.
3) Designing an automatic control algorithm rule module of the regulation and control system:
the module is based on an automatic mode, when an operator presses an automatic start button, a control system starts to run fully automatically to take over the tracking, regulation and control and monitoring of certain process parameter indexes, manual intervention is not needed, and at the moment, the full-automatic control algorithm of the system is as follows: 1) according to a preset parameter value of an Sp _ Centre _ Line of the debenzolization tower top temperature control center Line, an upper limit floating value set _ uplimtscale of the debenzolization tower top temperature center Line and an upper limit floating value set _ lowimtscale of the debenzolization tower top temperature center Line, obtaining a program automatic intervention condition: namely, displaying an upper limit value uplimiter = Sp _ Centre _ Line + set _ uplitscale of the center Line of the debenzolization tower top temperature after being set, as an upper trigger limit of the debenzolization tower top temperature, displaying a lower limit value lowimiter = Sp _ Centre _ Line-set _ lowlimumcale of the center Line of the debenzolization tower top temperature after being set, as a lower trigger limit of the debenzolization tower top temperature, when a pulse output reach _ period signal of a set period value is reached, automatically judging if Real _ PV > uplimiter, out _ temp = out _ temp + out _ upper _ value, if Real _ PV < lowimiter, out _ temp = out _ temp _ out _ lowerwardjvalue, simultaneously performing abnormal signal check, if out _ temp < =min _ open _ dew _ decision, out _ temp = out _ weigh _ alarm, and alerting operator to alarm, if out _ alarm _ flag is set, and sending out _ highhalarm alarm to remind post operators to pay attention, and finally intervening the controlled variable with out _ adjust = out _ temp if no abnormity exists, so that the controlled variable returns to the normal range value, and manually intervening if the automatic operation mode needs to be cancelled, wherein the control system can automatically remove the trusteeship only by pressing the automatic stop button, and all the last executed data parameters are stored and transmitted to the operators, so that the stable and orderly control transition of the whole process system is ensured, and the potential safety hazard is prevented.
A hardware processor: the Siemens PLC controllers S7-400PLC, which are field PLC processors, are fully utilized as processors of the control system, and OB35 tissue blocks with the cycle period of 100ms provided by the system are adopted as execution main bodies of the control system.
The process requirements are as follows: the control requirement of the temperature of the top of the benzene removal tower for the south chemical product and the benzene removal tower is in the range of TC =74.3-74.8 ℃, the actual process requirement is met, the temperature can be adjusted by controlling the reflux quantity of the light benzene and the introduced steam pressure, wherein the reflux quantity of the light benzene and the steam pressure can be controlled by adjusting valves on respective pipelines, the minimum opening degree of the light benzene and the steam pressure is 57.0, and the maximum opening degree of the light benzene and the steam pressure is 59.6.
The control system is applied to control, and the parameters are set as follows: model _ manual _ auto = true (automatic mode selected), start = true (automatic control start), Sp _ center _ Line =74.5, minimum opening min _ open _ degree =57.0, maximum opening max _ open _ degree =59.6, upper limit float value set _ upper scale =0.3 of the center Line of the debenzolization tower top temperature, lower limit float value set _ lowmartscale =0.2 of the center Line of the debenzolization tower top temperature, real-time sampling period set _ sample _ period =15 of the debenzolization tower top temperature according to the process field conditions, regulating valve output automatically adjusted added float amount out _ adjust _ value =0.2, regulating valve output automatically adjusted float amount out _ lowedj _ value =0.2, pre-scale _ pre-scale =10 of the setting clock period, maximum sampling period =74.8, upper limit range of the debenzolization tower top temperature is set, upper limit value =74.8 is displayed, lowimiter =74.3, Real _ PV = PIW280 (controlled crude benzene tower top temperature sensor is connected with input word of PLC controller), out _ adjust = PQW520 (controlled light benzene reflux quantity regulating valve is connected with output word of PLC controller) for displaying lower limit value of post-debenzolization tower top temperature central line, after the system is put into operation, the using effect is good, and the system is gradually popularized, before the system is put into use, the temperature fluctuation is often more than +/-5 by adopting the transmission PID automatic control method for adjustment, but also has poor stability, the temperature of the controlled parameter often oscillates in equal amplitude or diverges and oscillates above and below the central value of the target temperature, the adjustment is frequent, the system can not be stabilized, and then, the post workers change to manual PID control, however, the adjustment is not timely, the missing adjustment and the misadjustment occur occasionally, the abnormal rate of the process product is high, and the actual requirement cannot be met. After the regulation and control system is used, the effect is obvious, and a plurality of defects of the method are overcome.
The method solves the problem of insufficient regulation of the traditional PID regulation method and meets the requirement of an actual process control system. The expected effect is achieved, and no fault occurs within 3 months from design to implementation. The stable and smooth operation of the chemical production system and the safe production of each process is greatly ensured, the stability of the safe operation of the chemical production control system is improved, and the occurrence of potential major production and safety accidents is eliminated. On the other hand, the problems of system divergent oscillation, constant amplitude oscillation and the like caused by the traditional PID adjusting method are solved, another high-reliability low-cost chemical process parameter adjusting and controlling scheme based on PLC control is provided, reference is provided for the application of similar projects in the same row, reference is provided for the application of similar industries in the country and other areas, and the potential value to be created is higher according to estimation.
After the regulation and control system is put into operation, a debenzolization tower temperature curve graph of 12 hours is counted, and it can be obviously seen from the debenzolization tower temperature curve graph, after the regulation and control system is put into automatic operation, the debenzolization tower top temperature operation is stable, the fluctuation is small, the effect is good, the problem that the PID automatic regulation debenzolization tower top temperature fluctuation is large, the PID automatic regulation and control system can not be applied (because the PID automatic regulation and control diagram cannot be automatically controlled by PID in actual process and can not acquire data drawing) since the production year of 2007 is solved, and only the manual PID regulation and control system can be used for meeting the process requirements is solved.
Claims (1)
1. The utility model provides a multistage multivariable decoupling zero of deciding width of a cascade discrete regulation takes off benzene tower top temperature system, realizes through PLC that its characterized in that: the method comprises the steps of input interface design, output interface design, intermediate quantity design, sampling period module design, starting module design and automatic control algorithm rule module design, and specifically comprises the following steps
Designing an input interface:
selecting model _ manul _ auto in a manual and automatic mode, automatically controlling to start a start, automatically controlling to stop a stop, Real-time feedback value Real _ PV of the temperature of the top of the debenzolization tower, center Line Sp _ Centre _ Line of the temperature of the top of the debenzolization tower, minimum opening min _ open of a light benzene reflux stop valve and a steam pressure stop valve, maximum opening max _ open of the light benzene reflux stop valve and the steam pressure stop valve, and types of the light benzene reflux stop valve and the steam pressure stop valve;
output interface design
Controlling the temperature of the top of the debenzolization tower to adjust a threshold value out _ adjust, opening the light benzene reflux stop valve and the steam pressure stop valve to a minimum stop opening alarm out _ loweralarm, and opening the light benzene reflux stop valve and the steam pressure stop valve to a maximum stop opening alarm out _ highalarm;
design of intermediate quantity
Manually/automatically inputting and outputting an intermediate output quantity out _ temp, starting a control operation command to output run _ out, reaching a pulse output reach _ set _ period of a set period value, outputting one _ second _ pulse _ out, adding an intermediate quantity inter _ amplitude, setting an upper limit floating value set _ upper level of the debenzolization tower top temperature, setting a lower limit floating value set _ lowlimumab of the debenzolization tower top temperature, setting a real-time sampling period set _ sample _ period of the debenzolization tower top temperature, automatically controlling a lower regulating valve to output an automatically regulated floating value set _ upper _ value, automatically controlling a lower regulating valve to output an automatically regulated and reduced floating value out _ lowerwadjective _ value, executing a program to display in real time to reach the intermediate quantity of a sampling period, displaying an upper limit value of the debenzolization tower top temperature after being set, displaying a lower limit value of the debenzolization tower top temperature after being set, displaying a maximum sampling period value of a clock period, and setting a maximum sampling period value;
sample period module design
Through a reference cycle period T0 of the PLC, T0=100ms, a prescale factor clock _ prescaler of a reference clock period with a default value of 10.0, 10 frequency division can be realized, the clock _ prescale T0=10 × 100ms =1000ms = 1s, a sampling reference period T1 with the reference period of 1s is obtained, the actual sampling period is set according to the requirement of an actual process system by using a formula Sample _ Time = a × T1, a is an actual engineering coefficient, and the range is 0-max _ Sample _ period, and max _ Sample _ period is a maximum sampling period value; when a fault or misoperation occurs outside the system, the parameter set _ sample _ period < =0 or set _ sample _ period > max _ sample _ period in the sampling period module, namely an abnormality occurs, then the sampling period module can automatically execute zero clearing, namely set _ sample _ period = 0; to ensure safety;
start-up module design
When an operator presses an automatic start, the control system starts to operate the tracking, regulation and monitoring of the temperature of the top of the debenzolization tower, manual intervention is not needed, the system program automatically operates, if an automatic operation mode needs to be cancelled, the control system automatically releases the trusteeship only by pressing an automatic control stop, and all data parameters executed at the last time are stored and transmitted to the operator, so that the control of the whole process system is ensured to be in smooth and ordered transition, and potential safety hazards are prevented;
automatic control algorithm rule module design
The module is based on an automatic mode, when an operator presses an automatic start, the full-automatic operation is started to take over the tracking, regulation and control and monitoring of the temperature index of the top of the debenzolization tower, manual intervention is not needed, and the full-automatic control algorithm rule of the system is as follows
Obtaining the program automatic intervention condition according to a preset parameter value of an Sp _ Centre _ Line of the debenzolization tower top temperature, a set _ uplimtscale upper limit floating value of the debenzolization tower top temperature and a set _ lowimtscale upper limit floating value of the debenzolization tower top temperature: namely, displaying an upper limit value uplimiter = Sp _ center _ Line + set _ uplimeter of the debenzolization tower top temperature after being set, as an upper trigger limit of the debenzolization tower top temperature, displaying a lower limit value lowimiter = Sp _ center _ Line-set _ lowmetrimeter of the debenzolization tower top temperature after being set, as a lower trigger limit of the debenzolization tower top temperature, when a pulse output reach _ set _ period signal of a set period value is reached, automatically judging if Real _ PV > uplimiter, out _ temp = out _ temp + out _ up _ value, if Real _ PV < lowimiter, out _ temp = out _ temp-out _ lowedjustvalue, simultaneously performing an abnormal signal check, if out _ temp < = min _ open _ benefit _ degree, if out _ temp _ decay = out _ alarm, and issuing a warning alarm, if operation _ alarm _ out _ alarm _ value is issued, reminding a post operator to pay attention, and if no abnormity exists, finally intervening the controlled variable by the out _ adjust = out _ temp to make the controlled variable return to the normal range value, and if the automatic operation mode needs to be cancelled, manually intervening, only needing the operator to press the automatic stop button, the control system automatically removes the trusteeship, and completely stores and transmits the last executed data parameters to the operator, thereby ensuring the stable and orderly control transition of the whole process system and preventing the generation of potential safety hazards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210675709.6A CN115097876A (en) | 2022-06-15 | 2022-06-15 | Cascade fixed-width multivariable decoupling discrete control debenzolization tower top temperature system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210675709.6A CN115097876A (en) | 2022-06-15 | 2022-06-15 | Cascade fixed-width multivariable decoupling discrete control debenzolization tower top temperature system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115097876A true CN115097876A (en) | 2022-09-23 |
Family
ID=83291717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210675709.6A Pending CN115097876A (en) | 2022-06-15 | 2022-06-15 | Cascade fixed-width multivariable decoupling discrete control debenzolization tower top temperature system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115097876A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62114602A (en) * | 1985-11-14 | 1987-05-26 | Tohoku Sekiyu Kk | Control method of distilling column under floating pressure |
| CN103418156A (en) * | 2013-08-09 | 2013-12-04 | 中国蓝星（集团）股份有限公司 | Automatic control system and method for controlling reflux of light component removal rectifying tower |
| CN110252087A (en) * | 2019-06-14 | 2019-09-20 | 湖南千盟智能信息技术有限公司 | Crude benzol recovery process intelligent optimizing control system |
| CN114200981A (en) * | 2021-11-04 | 2022-03-18 | 金盛海洋科技有限公司 | Distillation tower top temperature control system and method |
-
2022
- 2022-06-15 CN CN202210675709.6A patent/CN115097876A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62114602A (en) * | 1985-11-14 | 1987-05-26 | Tohoku Sekiyu Kk | Control method of distilling column under floating pressure |
| CN103418156A (en) * | 2013-08-09 | 2013-12-04 | 中国蓝星（集团）股份有限公司 | Automatic control system and method for controlling reflux of light component removal rectifying tower |
| CN110252087A (en) * | 2019-06-14 | 2019-09-20 | 湖南千盟智能信息技术有限公司 | Crude benzol recovery process intelligent optimizing control system |
| CN114200981A (en) * | 2021-11-04 | 2022-03-18 | 金盛海洋科技有限公司 | Distillation tower top temperature control system and method |
Non-Patent Citations (1)
| Title |
|---|
| 吴俊波: "大型焦炉回收控制***的设计与实现", 冶金自动化, 10 September 2013 (2013-09-10), pages 48 - 52 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101349893B (en) | Forecast control device of adaptive model | |
| CA2341371C (en) | Controllers that determine optimal tuning parameters for use in process control systems and methods of operating the same | |
| CN102147613B (en) | Model predictive control method and system for moisture and temperature of tobacco redryer | |
| CA2214590A1 (en) | Multivariable process control method and apparatus | |
| CN102607006B (en) | Boiler temperature control method for preventing integral saturation and intelligent integral | |
| RU2709044C1 (en) | Method of automatic control of capacity of installation of low-temperature gas separation in conditions of extreme north | |
| CN115097876A (en) | Cascade fixed-width multivariable decoupling discrete control debenzolization tower top temperature system | |
| CN102520618A (en) | Coking heating furnace radiation outlet temperature control method under error tolerance mechanism | |
| CN104898425B (en) | Anti-saturation internal model control system design method based on static feedforward compensation | |
| Wahid et al. | Multivariable model predictive control design of reactive distillation column for Dimethyl Ether production | |
| Zierhut et al. | Distributed control strategy with Smith's predictor in a pilot‐scale diabatic distillation unit | |
| US5831850A (en) | Method and device for control over an admissable range with contextual anticipation using fuzzy logic | |
| CN101864017B (en) | Automatic control method for butadiene polymerization reaction | |
| CN203908357U (en) | Automatic control device for steam temperature-reducing and pressure-reducing system | |
| CN113867134A (en) | PID control dead zone adjusting method based on programmable logic controller | |
| CN110243138B (en) | Air separation equipment model feedforward control system and method | |
| CN108107713B (en) | Design method of proportional-differential advanced intelligent model set PID controller | |
| CN102419551B (en) | Coking heating furnace hearth pressure control method under error tolerance limit mechanism | |
| CN110186027A (en) | A kind of gas fired-boiler power output evaluation system and method | |
| EP3304236B1 (en) | System and method for controlling ramp imbalances in model predictive controllers | |
| CN205295187U (en) | Methyl formate production facility | |
| Ho et al. | Knowledge-based multivariable PID control | |
| CN116474405A (en) | PLC control stripping rectifying column control system based on 5G early warning | |
| CN216536967U (en) | Automatic rectification system of methyl alcohol | |
| CN202563328U (en) | Intelligent control system for artificial diamond press |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |