CN112162530A - Control system and method for CMES (China Mobile communications System) blowing system - Google Patents
Control system and method for CMES (China Mobile communications System) blowing system Download PDFInfo
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- CN112162530A CN112162530A CN202010863696.6A CN202010863696A CN112162530A CN 112162530 A CN112162530 A CN 112162530A CN 202010863696 A CN202010863696 A CN 202010863696A CN 112162530 A CN112162530 A CN 112162530A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/41845—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by system universality, reconfigurability, modularity
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/33—Director till display
- G05B2219/33273—DCS distributed, decentralised controlsystem, multiprocessor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses a control system and a control method for a CMES (China Mobile communications services) blowing system. The control method for the CMES blowing system comprises the following steps: step S1: the DCS gives blowing starting signals of one or more current blowing systems according to a preset control sequence; step S2: the PLC of each blowing system in step S1 obtains the blowing start signal, so that each blowing system in step S1 is controlled by the corresponding PLC to perform a preset blowing start action; step S3: the DCS gives a blowing off signal of the blowing system in step S1. The control system and the method thereof for the CMES injection system skillfully combine the PLC and the DCS, so that the PLC and the DCS are coordinated and play their own roles respectively, and the optimal control of the CMES injection system is realized.
Description
Technical Field
The invention belongs to the field of CMES control, and particularly relates to a control method and a control system for a CMES blowing system.
Background
The invention discloses an invention patent application with a publication number of CN111026017A and a subject name of a double-process combined denitration linkage control system for treating tail gas of a waste incineration plant, and the technical scheme discloses a system comprising a NOx Fourier transform infrared analyzer, an NH3 laser spectrum analyzer, a medicament storage device, a medicament conveying device, a medicament injection device and a system control unit; the medicament storage equipment consists of a medicament storage tank, a medicament filling pump, related instruments and valves and is used for storing medicaments required by the SNCR and SCR systems, wherein the medicaments are ammonia water or urea; the drug delivery device consists of a delivery pump, a flowmeter, a regulating valve and the like and is used for delivering drugs and dilution water required by the SNCR and SCR systems, and the unit receives signals of a system control box to regulate the delivery amount of the drugs; the reagent spraying equipment consists of an atomizing spray gun, a compressed air pipeline, a reducing agent pipeline and a matched valve and is used for spraying the atomized reagent into a boiler and an SCR reactor for denitration; the system control unit consists of a PLC control cabinet, an MCC power distribution cabinet and a local control box, receives NOx and NH3 concentration signals given by a NOx Fourier transform infrared analyzer and an NH3 laser spectrum analyzer, adjusts the flow of ammonia water by using a closed-loop automatic control mode, and ensures that the emission concentration of NOx meets the environmental protection requirement.
In the field of CMES control, the above-mentioned invention patent application is taken as an example, although further "step C4: and after the ammonia water delivery pump is started, the dilution water pump is started. The technical scheme is that the system calculates the ammonia water injection amount and calculates and respectively selects signals of a burning system DCS, and the technical scheme relates to the DCS, but in the prior art, the technical scheme does not further relate to how to realize cooperation linkage between the PLC and the DCS in the field of CMES control.
Further, the rabbetA clean, low-carbon, safe and sustainable modern energy system is constructed, and the ultra-low emission standard is indispensable. However, in practice, the main emissions (dust, NOx, SO) result from various operating conditions and other external causes2) And (4) exceeding the standard.
Currently, each set of equipment of a blowing system of a CMES meter is provided with an independent blowing system, and the number of the equipment is 7. The inlet and outlet of each absorption tower are respectively provided with one set of equipment, and the total number of the 3 main discharge outlets is 16 sets of equipment (the 2# discharge outlet and the 6# furnace outlet are the same equipment), which means that the 16 sets of equipment are independent blowing systems and are independently controlled by a PLC (programmable logic controller). When each set of CMES equipment is used for blowing, emission data is lost during the period, and an operation operator cannot perform operation adjustment according to actual data of the emissions, which often causes that emission indexes jump up once during the recovery of blowing end data to exceed standards.
Further, when several sets of CMES devices are simultaneously blowing, several sets of absorption tower data are overlapped and taken off line simultaneously, so that the total row data is uncontrollable, and the consequences are serious. The phenomenon is not caused by human factors (untimely adjustment) or uncontrollable working conditions (change of nitrogen and sulfur components of combustion products), can be completely solved through optimization, and needs to be further improved.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides a control method and a control system for a CMES blowing system.
The invention discloses a control system and a control method for a CMES (China Mobile communications System) injection system, which are mainly used for skillfully combining a PLC (programmable logic controller) and a DCS (distributed control system), so that the PLC and the DCS are coordinated and play their own roles, and the optimal control of the CMES injection system is realized.
The invention discloses a control system and a method for a CMES injection system, and the other aim is to combine DCS and PLC, achieve optimization through mutual linkage of the DCS and the PLC, perform injection sequence control and CMES equipment operation condition display by the DCS, and complete actual injection by the PLC.
The invention discloses a control system and a method for a CMES (China Mobile communications systems) injection system, and the other purpose is that only a sequence control and working condition display mechanism needs to be adjusted, the investment cost is low, and the injection operation working condition can be reflected in real time.
The invention adopts the following technical scheme that the control method for the CMES blowing system comprises the following steps:
step S1: the DCS gives blowing starting signals of one or more current blowing systems according to a preset control sequence;
step S2: the PLC of each blowing system in step S1 obtains the blowing start signal, so that each blowing system in step S1 is controlled by the corresponding PLC to perform a preset blowing start action;
step S3: the DCS gives a blowing off signal of the blowing system in step S1;
step S4: the PLC of each blowing system in step S1 acquires the blowing closing signal, so that each blowing system in step S1 is controlled by the corresponding PLC to perform a preset blowing closing action, respectively;
step S5: and repeatedly executing the steps S1 to S4, so that all or part of the blowing systems are controlled by the corresponding PLC to respectively execute the preset blowing starting action and the blowing closing action.
According to the above technical solution, as a further preferable technical solution of the above technical solution, the step S2 is specifically implemented as the following steps:
step S2.1: the PLC of each blowing system in step S1 obtains the blowing start signal respectively;
step S2.2: the PLC controls the corresponding blowing system to close the sampling pump;
step S2.3: the PLC controls the blowing system to close the heater;
step S2.4: and the PLC controls the blowing system to open the blowing electromagnetic valve.
According to the above technical solution, as a further preferable technical solution of the above technical solution, the following steps are further included between step S2 and step S3:
the DCS sets the injection countdown.
According to the above technical solution, as a further preferable technical solution of the above technical solution, the step S4 is specifically implemented as the following steps:
step S4.1: the PLC of each blowing system in the step S3 respectively acquires the blowing closing signal;
step S4.2: the PLC controls the corresponding injection system to close the injection electromagnetic valve;
step S4.3: the PLC controls the blowing system to open the sampling heater;
step S4.4: the PLC controls the blowing system to be preheated to a specified temperature;
step S4.5: the PLC controls the injection system to open the sampling pump;
step S4.5: sampling and recovering display emissions data.
According to the above technical solution, as a further preferable technical solution of the above technical solution, the step S4 is further embodied as the following step:
step S4.6: operational adjustments are made by the operating operator based on the emissions data.
The invention further discloses a control system for the CMES blowing system, which is used for implementing the steps of the control method for the CMES blowing system disclosed by any one of the technical schemes.
The control system and the control method for the CMES injection system have the advantages that the PLC and the DCS are ingeniously combined, so that the PLC and the DCS are in cooperative linkage and each takes its own role, and the optimal control of the CMES injection system is realized.
Drawings
Fig. 1 is a flow chart of a conventional (pure) PLC control.
FIG. 2 is a flow chart of the PLC in combination with the DCS of the present invention.
FIG. 3 is a schematic diagram of the control sequence of the PLC and DCS of the present invention.
Detailed Description
The invention discloses a control method for a CMES blowing system and a control system for the CMES blowing system, and the following describes the specific implementation of the invention with reference to the preferred embodiment.
In contrast, when the improved technical solutions of the prior art are conceived, the following three solutions are involved:
firstly, all the PLCs are integrated into a whole, and a master controller respectively controls other CMES devices (CMES injection systems) to perform injection.
Secondly, all PLCs are not reserved, and DCS is used for controlling CMES equipment (CMES injection system) to perform injection globally.
Thirdly, the DCS and the PLC are combined, and the optimization is achieved through mutual linking of the DCS and the PLC. And the DCS is used for carrying out injection sequence control and CMES equipment operation condition display, and the PLC is used for finishing actual injection.
The feasibility of the three schemes is comprehensively analyzed:
the first scheme is as follows: the whole set of PLC equipment is required to be input to write a master control program. However, the independent PLC control system does not allow the operator to see the distribution and blowing operation of each CMES device: whether the blowing system has faults or not cannot eliminate the defects in time.
Scheme II: the program is completely rewritten, and the signal lines are completely rearranged. The solution can be implemented but the investment cost is too large.
The third scheme is as follows: sequence control and working condition display programs need to be compiled, the investment cost is low, and the blowing operation working conditions can be reflected in real time.
Referring to fig. 1 of the drawings, in the prior art, a blowing system is completely controlled by a PLC to realize intermittent blowing, and a corresponding flow is shown in fig. 1.
It is worth mentioning that the embodiments of the present invention may relate to a cmes (continuous Emission Monitoring system), which is defined as a continuous Monitoring system for smoke Emission.
It is worth mentioning that, in the present invention, the plc (programmable Logic controller) may be involved in various embodiments of the present invention, which is defined as a programmable Logic controller, and the present invention focuses on controlling the blowing system as an independent terminal, so that the control coverage area is small.
It should be noted that, in the present invention, a distributed Control system (dcs) may be defined as a distributed Control system, where the distributed Control system focuses on controlling each PLC globally, and the Control coverage is large.
It should be noted that "CMES blowing system", "blowing device", "CMES device", and the like, which may be involved in various embodiments of the present invention, are the same concept and are not distinguished.
It should be noted that "DCS", "DCS system", and the like, which may be related to various embodiments of the present invention, are the same concept and are not distinguished.
It should be noted that "PLC", "PLC system", and the like, which may be related to various embodiments of the present invention, are the same concept and are not distinguished.
A preferred embodiment (the blowing start signal in step S1 may act on the PLCs of one or more blowing systems simultaneously).
Referring to fig. 2 to 3 of the drawings, fig. 2 shows a control system for a CMES blowing system and a corresponding flow of a method thereof, and fig. 3 shows a specific control sequence of the control system for the CMES blowing system and the method thereof.
Preferably, the control method for the CMES blowing system includes the following steps:
step S1: the DCS gives blowing starting signals of one or more current blowing systems according to a preset control sequence;
step S2: the PLC of each blowing system in step S1 respectively acquires the blowing start signal (given by the DCS) so that each blowing system in step S1 is controlled by the corresponding PLC to perform a preset blowing start action;
step S3: the DCS gives a blowing off signal of the blowing system in step S1;
step S4: the PLC of each blowing system in step S1 acquires the blowing off signal (given by the DCS) so that each blowing system in step S1 is controlled by the corresponding PLC to perform a preset blowing off action, respectively;
step S5: and repeatedly executing the steps S1 to S4, so that all or part of the blowing systems are controlled by the corresponding PLC to respectively execute the preset blowing starting action and the blowing closing action.
Further, step S2 is specifically implemented as the following steps:
step S2.1: the PLC of each blowing system in step S1 acquires the blowing start signal (given by the DCS) respectively;
step S2.2: the PLC (of each blowing system in the step S1) controls the corresponding blowing system to close the sampling pump;
step S2.3: the PLC (of each blowing system in step S1) controls the blowing system (in step S2.2) to turn off the heater;
step S2.4: the PLC (of each blowing system in step S1) controls the blowing system (in step S2.2) to open the blowing solenoid valve.
Further, the following steps are also included between step S2 and step S3:
the DCS sets the injection countdown.
Further, step S4 is specifically implemented as the following steps:
step S4.1: the PLC of each blowing system in step S3 acquires the blowing off signal (given by the DCS) respectively;
step S4.2: the PLC (of each blowing system in the step S3) controls the corresponding blowing system to close the blowing electromagnetic valve;
step S4.3: the PLC (of each blowing system in step S3) controls the blowing system (in step S4.2) to turn on the sampling heater;
step S4.4: the PLC (of each blowing system in step S3) controls the blowing system (in step S4.2) to preheat to a specified temperature;
step S4.5: the PLC (of each blowing system in step S3) controls the blowing system (in step S4.2) to turn on the sampling pump;
step S4.5: sampling and recovering display emissions data.
Further, step S4 is further embodied as the following steps:
step S4.6: the operational adjustments (e.g. fine tuning a preset control sequence of the DCS, etc.) are made by the operating operator based on the emissions data (actually sampled in step S4.5).
It should be noted that the preset control sequence of the DCS is shown in fig. 3 of the drawings.
It should be noted that the present embodiment also discloses a control system for a CMES blowing system, which is used for implementing the steps of the control method for a CMES blowing system disclosed in any one of the above technical solutions of the present embodiment.
The first embodiment (the blowing start signal in step S1 is applied to the PLC of the corresponding blowing system).
Referring to fig. 2 to 3 of the drawings, fig. 2 shows a control system for a CMES blowing system and a corresponding flow of a method thereof, and fig. 3 shows a specific control sequence of the control system for the CMES blowing system and the method thereof.
Preferably, the control method for the CMES blowing system includes the following steps:
step S1: the DCS sends a blowing starting signal of the current blowing system according to a preset control sequence;
step S2: the PLC of the blowing system in step S1 acquires the blowing start signal (given by the DCS) so that the blowing system in step S1 is controlled by the corresponding PLC to perform a preset blowing start action;
step S3: the DCS gives a blowing off signal of the blowing system in step S1;
step S4: the PLC of the blowing system in step S1 acquires the blowing off signal (given by the DCS) so that the blowing system in step S1 is controlled by the corresponding PLC to perform a preset blowing off action;
step S5: and repeatedly performing the steps S1 to S4 so that all or part of the blowing systems are controlled by the corresponding PLC to perform the preset blowing start motion and blowing off motion.
Further, step S2 is specifically implemented as the following steps:
step S2.1: the PLC of the blowing system in step S1 acquires the blowing start signal (given by the DCS);
step S2.2: the PLC (of the blowing system in the step S1) controls the corresponding blowing system to close the sampling pump;
step S2.3: the PLC (of the blowing system in step S1) controls the blowing system (in step S2.2) to turn off the heater;
step S2.4: the PLC (of the blowing system in step S1) controls the blowing system (in step S2.2) to open the blowing solenoid valve.
Further, the following steps are also included between step S2 and step S3:
the DCS sets the injection countdown.
Further, step S4 is specifically implemented as the following steps:
step S4.1: the PLC of the blowing system in step S3 respectively acquires the blowing off signals (given by the DCS);
step S4.2: the PLC (of the blowing system in the step S3) controls the corresponding blowing system to close the blowing electromagnetic valve;
step S4.3: the PLC (of the blowing system in step S3) controls the blowing system (in step S4.2) to turn on the sampling heater;
step S4.4: the PLC (of the blowing system in step S3) controls the blowing system (in step S4.2) to preheat to a specified temperature;
step S4.5: the PLC (of the blowing system in step S3) controls the blowing system (in step S4.2) to turn on the sampling pump;
step S4.5: sampling and recovering display emissions data.
Further, step S4 is further embodied as the following steps:
step S4.6: the operational adjustments (e.g. fine tuning a preset control sequence of the DCS, etc.) are made by the operating operator based on the emissions data (actually sampled in step S4.5).
It should be noted that the preset control sequence of the DCS is shown in fig. 3 of the drawings.
It should be noted that the present embodiment also discloses a control system for a CMES blowing system, which is used for implementing the steps of the control method for a CMES blowing system disclosed in any one of the above technical solutions of the present embodiment.
It should be noted that as a further development of the above embodiments of the present invention, on the basis of the above embodiments, a first modified embodiment is further disclosed, and a technical solution of the first modified embodiment further includes:
1. after the preliminary completion, the operation personnel can communicate to see whether the scheme is still to be optimized, and the leader is reported to be modified.
2. And communicating with a PLC manufacturer, modifying a PLC control program, and providing PLC point locations of all information.
3. Adding a DCS card, compiling a DCS sequence control program configuration, adding a required injection running condition on a DCS control picture, displaying injection countdown time and the like.
4. And arranging signal cables which are respectively connected to two ends of the PLC and the DCS.
5. Debugging each newly added device and removing faults.
It should be noted that as a further development of the above embodiments of the present invention, on the basis of the above embodiments, a second modified embodiment is further disclosed, and a technical solution of the second modified embodiment further includes:
1. recording whether blowing overlapping still exists, if so, checking whether programs at two ends have errors, and modifying.
2. And recording the number of times that the optimized total row exceeds the standard during the blowing period.
3. And (4) before viewing the historical curve record, the number of times of data exceeding is caused by the overlapped blowing.
4. And performing data comparison analysis before and after optimization, and reading how much help is brought to the control of the environmental protection data by the optimization.
It should be noted that technical features such as specific type selection of the sampling pump and specific type selection of the blowing electromagnetic valve related to the present patent application should be regarded as the prior art, specific structures, operation principles, control modes and spatial arrangement modes that may be related to the technical features should be adopted by conventional selection in the field, and should not be regarded as the points of the present patent, and the present patent is not further specifically described in detail.
It will be apparent to those skilled in the art that modifications and equivalents may be made in the embodiments and/or portions thereof without departing from the spirit and scope of the present invention.
Claims (6)
1. A control method for a CMES blowing system is characterized by comprising the following steps:
step S1: the DCS gives blowing starting signals of one or more current blowing systems according to a preset control sequence;
step S2: the PLC of each blowing system in step S1 obtains the blowing start signal, so that each blowing system in step S1 is controlled by the corresponding PLC to perform a preset blowing start action;
step S3: the DCS gives a blowing off signal of the blowing system in step S1;
step S4: the PLC of each blowing system in step S1 acquires the blowing closing signal, so that each blowing system in step S1 is controlled by the corresponding PLC to perform a preset blowing closing action, respectively;
step S5: and repeatedly executing the steps S1 to S4, so that all or part of the blowing systems are controlled by the corresponding PLC to respectively execute the preset blowing starting action and the blowing closing action.
2. The control method for the CMES blowing system of claim 1, wherein the step S2 is implemented as the following steps:
step S2.1: the PLC of each blowing system in step S1 obtains the blowing start signal respectively;
step S2.2: the PLC controls the corresponding blowing system to close the sampling pump;
step S2.3: the PLC controls the blowing system to close the heater;
step S2.4: and the PLC controls the blowing system to open the blowing electromagnetic valve.
3. The control method for the CMES blowing system of claim 1, further comprising the steps between step S2 and step S3 of:
the DCS sets the injection countdown.
4. The control method for the CMES blowing system of claim 2, wherein the step S4 is implemented as the following steps:
step S4.1: the PLC of each blowing system in the step S3 respectively acquires the blowing closing signal;
step S4.2: the PLC controls the corresponding injection system to close the injection electromagnetic valve;
step S4.3: the PLC controls the blowing system to open the sampling heater;
step S4.4: the PLC controls the blowing system to be preheated to a specified temperature;
step S4.5: the PLC controls the injection system to open the sampling pump;
step S4.5: sampling and recovering display emissions data.
5. The control method for the CMES blowing system of claim 4, wherein the step S4 is further embodied as the steps of:
step S4.6: operational adjustments are made by the operating operator based on the emissions data.
6. A control system for a CMES blowing system, characterized by the steps of implementing a control method for a CMES blowing system according to any one of claims 1 to 5.
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| CN111026017A (en) * | 2019-12-12 | 2020-04-17 | 上海康恒环境股份有限公司 | Double-process combined denitration interlocking control system for tail gas treatment of waste incineration plant |
| CN111359438A (en) * | 2020-04-09 | 2020-07-03 | 国电环境保护研究院有限公司 | Ammonia spraying optimization control method and control system for SCR flue gas denitration device |
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| CN102527204A (en) * | 2012-03-10 | 2012-07-04 | 娄卡奔新能源科技发展(上海)有限公司 | Intelligent control system for smoke denitration of cement plant |
| CN106422709A (en) * | 2016-10-24 | 2017-02-22 | 大唐韩城第二发电有限责任公司 | Ammonia spraying regulation automatic control method for denitrification system of thermal power plant |
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