CN108246104B - Digital ultrafiltration system and method - Google Patents
Digital ultrafiltration system and method Download PDFInfo
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- CN108246104B CN108246104B CN201711493150.0A CN201711493150A CN108246104B CN 108246104 B CN108246104 B CN 108246104B CN 201711493150 A CN201711493150 A CN 201711493150A CN 108246104 B CN108246104 B CN 108246104B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/18—Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/22—Controlling or regulating
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The utility model discloses a digital ultrafiltration system and a method, which relate to the technical field of ultrafiltration, wherein the system comprises a circulation pipeline, at least one ultrafiltration membrane packet which is connected to the circulation pipeline and is arranged in parallel, and a control subsystem, wherein the control subsystem comprises a digital sensor, an input pressure sensor and an output pressure sensor which are arranged on the circulation pipeline, and further comprises an execution piece and a control end; the liquid preparation method based on the system comprises the following steps: the control end controls the flow control valve to modulate so that the transmembrane pressure accords with transmembrane pressure index data; the digital sensor detects the index real-time data of the permeate liquid and feeds the index real-time data back to the control end; the control end compares the index real-time data with the stored index target data, judges whether the index real-time data is matched with the stored index target data, and controls each executive component to act until the index real-time data of the permeate accords with the index target data, and then the target permeate is output. The utility model improves the accuracy of ultrafiltration by comparing the corresponding conductivity data selected by the environmental parameters to judge.
Description
Technical Field
The utility model relates to the technical field of ultrafiltration, in particular to a digital ultrafiltration system and method.
Background
Ultrafiltration is a membrane separation process using screening as a separation principle and using pressure as a driving force, has the filtration precision within the range of 0.005-0.002 mu m, can effectively remove particles, colloid, bacteria, heat sources and high molecular organic substances in water, and can be widely applied to separation, concentration and purification of substances.
Chinese patent publication No. CN203648395U discloses an automatic ultrafiltration system comprising a membrane pump. The ultrafiltration membrane bag is provided with a liquid inlet, a liquid outlet and a liquid return port, a first pressure sensor is connected between the outlet end of the diaphragm pump and the liquid inlet of the ultrafiltration membrane Bao Jie, a second pressure sensor is connected to the liquid return port of the ultrafiltration membrane bag, the second pressure sensor is connected with a shutoff valve, the liquid outlet of the ultrafiltration membrane bag is connected with a third pressure sensor, and the first pressure sensor, the second pressure sensor, the third pressure sensor and the shutoff valve are respectively connected with the PLC. According to the technical scheme disclosed by the patent, the opening degree of the shut-off valve and the flow rate of the pump can be regulated according to the three pressure sensors connected with the ultrafiltration membrane bag, so that the transmembrane pressure is regulated, the most reasonable ultrafiltration condition is obtained, the continuous ultrafiltration process can be realized, and the ultrafiltration efficiency is improved.
However, it is not possible to accurately determine whether or not the permeate is a desired target permeate by controlling only the transmembrane pressure, and the ultrafiltration accuracy cannot be controlled.
Disclosure of Invention
The utility model provides a digital ultrafiltration system and a method, which can improve the regulation precision of transmembrane pressure and the ultrafiltration precision.
A first aspect of the present utility model provides a digital ultrafiltration system comprising:
the system comprises a circulation pipeline for inputting and outputting target permeate liquid with target real-time data meeting target data requirements of a sample liquid, at least one ultrafiltration membrane packet connected to the circulation pipeline and arranged in parallel, and a control subsystem;
the control subsystem includes:
the plurality of groups of digital sensors are arranged on the flow pipeline and used for detecting index real-time data of the permeate liquid;
the input pressure sensor and the output pressure sensor are arranged on the flow pipeline and used for respectively detecting the hydraulic pressure of the input end and the output end of the ultrafiltration membrane bag;
the executive component is arranged on the flow pipeline and used for controlling the flow state of each node of the flow pipeline; the method comprises the steps of,
the control end is connected with the digital sensors, the input pressure sensor and the output pressure sensor, and controls the actuating part to act so as to output the target permeate liquid meeting the target data requirement of the index;
the index target data corresponds to the index real-time data and comprises conductivity data and environment parameter data.
According to the technical scheme, the digital sensor is adopted to detect the index real-time data of the permeate liquid, the values of the other environmental parameters except the electric conduction are transmitted to the control end, and the corresponding electric conductivity data are selected for judgment by comparing the environmental parameters. The change of conductivity data caused by the influence of other environmental parameters such as temperature is avoided, so that error instructions are given out due to the deviation between the detected value and the actual value, and the ultrafiltration precision is improved.
In some embodiments, the environmental parameter data includes one or more of temperature data, volumetric flow rate data, mass flow rate data, ph data, and combinations thereof.
According to the technical scheme, one or more environmental parameter data which can influence the conductivity data are collected by adopting the digital sensor, index target data of the corresponding conductivity data under the environment parameter data are edited and stored at the control end, so that the conductivity data detected under different environmental conditions are compared with the corresponding index target data, the influence of the environment parameter on the conductivity data is eliminated, and the judgment accuracy is improved.
In some embodiments, the flow-through line comprises:
the input pipeline is connected with the input end of the ultrafiltration membrane packet and used for inputting the sample liquid;
the output pipeline is connected to the output end of the ultrafiltration membrane packet and used for outputting the permeate;
and a return line connecting the output line and the input line for returning the non-standard permeate to the input line.
According to the technical scheme, the non-standard permeate liquid is returned to the input pipeline by adopting the return pipeline and is mixed with the sample liquid again for ultrafiltration, so that the utilization rate is improved, and the cost is reduced.
In some embodiments, the return line is provided with a return pressure sensor and the digitizing sensor.
By adopting the technical scheme, the non-standard permeate entering the return pipeline is detected again by arranging the digital sensor on the return pipeline, the content of the permeate is confirmed, the control rate of the solution in the circulation pipeline is improved, and therefore the accuracy of the command sent by the control end is improved; in addition, a reflux pressure sensor is arranged on the reflux pipeline to detect the hydraulic pressure in the reflux pipeline and feed back the hydraulic pressure to the control end, and the control end averages the combination area of the hydraulic pressure detected by the reflux pressure sensor and the hydraulic pressure in the input pipeline to obtain the final hydraulic pressure of the input end of the ultrafiltration membrane package, thereby improving the accuracy of judging the transmembrane pressure.
In some embodiments, the actuator comprises:
the diaphragm pump is arranged on the input pipeline and the input valve is used for controlling the on-off of the input pipeline;
automatic valves arranged at two sides of each ultrafiltration membrane bag;
the output valve is arranged on the output pipeline and used for controlling the output of the target permeate; the method comprises the steps of,
a return valve and a flow control valve disposed on the return line.
In the technical scheme, the flow control valve is arranged on the backflow management so as to conveniently control the flow of the liquid in the circulation pipeline and then control the hydraulic pressure in the circulation pipeline.
In some embodiments, the control end comprises at least one personal computer and at least one programmable logic controller for data storage by adopting a stack algorithm;
the programmable logic controller is provided with a database for storing target association relations between conductivity data and at least one environmental parameter data in the index target data and transmembrane pressure index data corresponding to each target permeate;
the programmable logic controller controls the action of the executing piece;
the personal computer is communicated with the programmable logic controller to realize data synchronization.
In the technical scheme, the programmable logic controller stores data by adopting a stack algorithm because of small storage capacity, so that repeated coverage of the data is realized, namely, the old data is replaced by coverage if new data comes in the latest data; in addition, the personal computer and the programmable logic controller are communicated, so that the control of the personal computer on the programmable logic controller is realized, the data synchronization is realized, the personal computer adopts a hard disk for storage, and the data storage capacity is larger, thereby effectively preventing information loss.
In some embodiments, the control end performs mutual checking of working states with the digital sensor, the input pressure sensor, the output pressure sensor and the reflux pressure sensor through interaction of handshake signals.
By adopting the technical scheme, the control end gives a signal to the digital sensor, the input pressure sensor, the output pressure sensor and the return pressure sensor when each time is started, the digital sensor, the input pressure sensor, the output pressure sensor and the return pressure sensor feed back a signal to the control end, and the control end compares and judges the fed back signals and sends out indication information of refusing use, warning or normal starting.
In some implementations, the personal computer and the programmable logic controller perform a mutual check of the working state through interaction of heartbeat signals.
By adopting the technical scheme, the mutual detection of the working states of the personal computer and the programmable logic controller is realized, so that the influence of the ultrafiltration result caused by information omission due to downtime of one party is prevented.
In some embodiments, the database also stores ID information and calibration data for the digitizing sensor, the input pressure sensor, the output pressure sensor, and the return pressure sensor; the database also stores normal working parameters and/or service life information of each component in the digital ultrafiltration system.
By adopting the technical scheme, the programmable logic controller establishes databases of each digital sensor, each input pressure sensor, each output pressure sensor and each reflux pressure sensor, each digital sensor, each input pressure sensor, each output pressure sensor and each reflux pressure sensor have fixed information values such as models, when the digital sensor, the input pressure sensor, each output pressure sensor and each reflux pressure sensor are replaced or the system is restarted, ID information of each digital sensor, each input pressure sensor, ID information of each output pressure sensor and ID information of each reflux pressure sensor are compared with information in the database of the programmable logic controller, whether the digital sensor, each input pressure sensor, each output pressure sensor and each reflux pressure sensor are legal or effective or not is detected, and indication information of refusing to use, warning or normal starting is sent out; in addition, the technical scheme realizes the on-line calibration of the digital sensor, the input pressure sensor, the output pressure sensor and the reflux pressure sensor, and the digital sensor, the input pressure sensor, the output pressure sensor and the reflux pressure sensor are not required to be detached for calibration, so that the time is saved, and the labor cost is reduced; in addition, through adopting above-mentioned technical scheme, realized the function of prejudging each part operating condition, remind the staff to change or maintain in advance, prevent the trouble emergence, improve work efficiency.
The second scheme of the utility model provides a digital ultrafiltration method based on the digital ultrafiltration system, which comprises the following steps:
s1: the control end selects corresponding transmembrane pressure index data according to the requirement of the required target permeate liquid, and adjusts the opening of the flow control valve and the flow of the diaphragm pump;
s2: the digital sensor detects the index real-time data of the permeate liquid and feeds the index real-time data back to the control end;
s3: the control end collects real-time association relations between conductivity data and at least one environmental parameter data in index real-time data of the permeate liquid, compares the real-time association relations with target association relations between corresponding index target data stored in the control end, and judges whether the index real-time data are matched; and controlling each executing piece to act until the index real-time data of the permeate accords with the index target data of the target permeate, and outputting the target permeate.
By adopting the technical scheme, the control end selects corresponding transmembrane pressure index data according to the requirement of the required target permeate liquid, and adjusts the opening of the flow control valve and the flow of the diaphragm pump, so that the difference value of the hydraulic pressure average value obtained by subtracting the detection of the output pressure sensor from the hydraulic pressure average value obtained by detecting the input pressure sensor and the reflux pressure sensor is the same as the transmembrane pressure index data, and permeate liquid meeting the requirement is filtered out; in addition, the permeate liquid is detected through a digital sensor and fed back to a control end to judge whether the permeate liquid is qualified or not, and the permeate liquid is managed and output from the output on the premise of being qualified, otherwise, the permeate liquid enters a return pipeline to be mixed with the sample liquid for ultrafiltration again, so that the utilization rate is improved, and the cost is reduced; secondly, the digital sensor is adopted to transmit the values of other environmental parameters except the electric conduction of the permeate liquid to the control end, and corresponding electric conductivity data are selected for judgment through comparison of the environmental parameters, so that the change of the electric conductivity data caused by the influence of other environmental parameters such as temperature and the like is avoided, and an error instruction is given out due to the deviation between the detected value and the actual value, thereby improving the accuracy of ultrafiltration.
In summary, the utility model has the following beneficial effects:
1. the digital sensor is adopted to replace the traditional analog sensor, other environmental parameter values except the electric conduction are transmitted to the control end, and corresponding electric conductivity data are selected for judgment by comparing the environmental parameters, so that the accuracy of the instruction sent by the control end is improved, and the ultrafiltration accuracy is improved.
2. The control end, the digital sensor, the input pressure sensor, the output pressure sensor and the return pressure sensor are mutually checked by the interaction of handshake signals, so that the stability of the system is improved.
3. And the personal computer and the programmable logic controller perform mutual checking of working states through interaction of heartbeat signals, so that information loss is effectively prevented.
4. And a database is built in the programmable logic controller, ID identification is carried out on the digital sensor, the input pressure sensor, the output pressure sensor and the reflux pressure sensor, the safety of the system is improved, the purpose of online verification is realized, and the working efficiency is improved.
5. And normal working parameters and/or service life information of each component in the digital ultrafiltration system are stored in the programmable logic controller, so that the prejudgement of the system is realized.
Drawings
FIG. 1 is a schematic diagram of a digital ultrafiltration system according to an embodiment of the present utility model;
FIG. 2 is a schematic block diagram of a digital ultrafiltration system according to an embodiment of the present disclosure;
FIG. 3 is a schematic block diagram of a programmable logic controller in a digital ultrafiltration system according to an embodiment of the present utility model.
Reference numerals:
11. an input pipeline; 12. a return line; 13. an output line; 21. digitizing the sensor; 22. an actuator; 222. an input valve; 223. an output valve; 120. a return valve; 121. a flow control valve; 5. a diaphragm pump; 6. an ultrafiltration membrane bag; 61. an automatic valve; 241. inputting a pressure sensor; 242. outputting a pressure sensor; 243. a return pressure sensor; 23. a control end; 231. a personal computer; 232. a programmable logic controller; 2321. a logic control unit; 2322. a database; 2323. an alarm unit; 3. a redundant network switch; 4. and a remote server.
Detailed Description
The technical scheme of the embodiment of the utility model will be described below with reference to the accompanying drawings.
As shown in fig. 1, the present utility model discloses a digital ultrafiltration system, specifically comprising:
a flow-through line comprising: an input pipeline 11 for inputting sample liquid, an output pipeline 13 for outputting permeate liquid, and a return pipeline 12 for communicating the output pipeline 13 with the input pipeline 11; wherein, a plurality of ultrafiltration membrane bags 6 are communicated between the input pipeline 11 and the output pipeline 13, as shown in fig. 1, in this embodiment of the present utility model, the description is given by taking 3 ultrafiltration membrane bags 6 as an example, and each ultrafiltration membrane bag 6 is connected in parallel; sample liquid is input from the input pipeline 11, after ultrafiltration is carried out by the ultrafiltration membrane bag 6, target permeate liquid meeting the target data requirements of each index is output from the output pipeline 13, and nonstandard permeate liquid not meeting the target data requirements of the index is output from the return pipeline 12;
a control subsystem, comprising: a digital sensor 21 provided on the output line 13 for detecting real-time index data of the permeate, and provided on the return line 12 for detecting real-time index data of the nonstandard permeate; an input pressure sensor 241 and an output pressure sensor 242 which are arranged on the flow pipeline and used for respectively detecting the hydraulic pressure of the input end and the output end of the ultrafiltration membrane packet 6; a return pressure sensor 243 provided on the return line 12; an actuator 22 provided on the flow pipeline and corresponding to each of the digitizing sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 for controlling the flow state of the flow pipeline; and a control end 23 for controlling the actuator 22 to act according to the real-time index data detected by the digital sensor 21 and the pressure data detected by the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 so as to output the target permeate liquid of which the real-time index data meets the target index data requirement.
As shown in fig. 1, in this embodiment of the present utility model, two sets of digital sensors 21 are respectively located on the output pipeline 13 and the return pipeline 12, the digital sensors 21 located on the output pipeline 13 are used for detecting the real-time data of the index of the permeate, and the digital sensors 21 located on the return pipeline 12 are used for detecting the real-time data of the index of the non-standard permeate again, so as to improve the accuracy of judgment and the accuracy of control by detecting the real-time data of the index of the non-standard permeate.
As shown in fig. 1, the actuator 22 includes: the diaphragm pump 5 is arranged on the input pipeline 11, and the input valve 222 is used for controlling the on-off of the input pipeline 11; automatic valves 61 provided on both sides of each ultrafiltration membrane packet 6; an output valve 223 provided in the output line 13 for controlling the output of the target permeate; and a return valve 120 and a flow control valve 121 provided on the return line 12.
As shown in fig. 2, the control terminal 23 is connected to two sets of the digitizing sensor 21, the input pressure sensor 241, the output pressure sensor 242, the return pressure sensor 243, and the actuator 22, and as shown in fig. 3, the control terminal 23 includes: at least one personal computer 231 and at least one programmable logic controller 232 corresponding to the personal computer 231, each of the digitizing sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 is connected to the personal computer 231 and the programmable logic controller 232, respectively, and each of the actuators 22 is connected to the programmable logic controller 232. In the embodiment of the present utility model, two personal computers 231 and two programmable logic controllers 232 are taken as an example, and of course, it is only required to emphasize that the personal computers 231 and the programmable logic controllers 232 are in one-to-one correspondence, but the specific number is determined according to the actual scale, and is not limited. The programmable logic controller 232 is provided with a database 2322, the personal computer 231 is provided with a visual operation interface, the personal computer 231 is in communication connection with the programmable logic controller 232, so that an operator can control the programmable logic controller 232 through the personal computer 231, and meanwhile, data synchronization between the personal computer 231 and the programmable logic controller 232 is realized, however, in the embodiment of the utility model, the database 2322 of the programmable logic controller 232 stores data in a smaller amount, so that a stack algorithm is adopted to temporarily store the data, the personal computer 231 stores data in a hard disk, the storage data amount is larger, the programmable logic controller 232 is synchronized to the personal computer 231 for storage after receiving new preset information, so that data loss is prevented, and repeated coverage of the data is realized, namely, if the latest data has new data, old data is replaced, so that data iteration is realized.
In this embodiment of the present utility model, the preset information stored in the database 2322 of the programmable logic controller 232 includes the target data of the target permeate, where the target data of the target permeate includes conductivity data and environmental parameter data, and the environmental parameter data includes one or more combinations of temperature data, volume flow rate data, mass flow rate data, and ph value data, and the database 2322 of the programmable logic controller 232 stores, in addition to the target data of each target permeate, target association relationships between the conductivity data and at least one of the environmental parameter data in each target data, that is, corresponding conductivity data under different environmental parameter data, where: the target value of the conductivity data is 80-150mS under the conditions that the temperature of the target liquid is 25 ℃ and the PH value is 4, and the environmental parameter data is not limited to PH value temperature data. Besides the above target data and the target association relationship between the conductivity data and at least one of the environmental parameter data in the target data, the database 2322 of the programmable logic controller 232 stores transmembrane pressure index data corresponding to each target permeate, and the opening degree of the flow control valve 121 is controlled by the transmembrane pressure index data corresponding to each target permeate, so as to achieve the purpose of controlling the hydraulic pressure, and in addition, the database 2322 of the programmable logic controller 232 stores ID information and calibration data of each digitalized sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the reflux pressure sensor 243, and normal operating parameters and/or service life information of each component in the digitalized ultrafiltration system. Of course, the preset information stored in the database 2322 of the programmable logic controller 232 is synchronized to the personal computer 231 for backup storage.
As shown in fig. 3, the programmable logic controller 232 further includes a logic control unit 2321 and an alarm unit 2323, and the database 2322 and the alarm unit 2323 are connected to the logic control unit 2321.
As shown in fig. 3, each digitalized sensor 21 feeds back the detected index real-time data of the permeate or the nonstandard permeate to the programmable logic controller 232, and the logic control unit 2321 selects corresponding conductivity data from the environmental parameter data of the corresponding index target data in the database 2322 according to the feedback information of each digitalized sensor 21, sends the corresponding conductivity data to the logic control unit 2321 for comparison and judgment, and controls the action of each executing member 22 according to the judgment result.
As shown in fig. 3, each of the digital sensors 21 has ID information of a fixed model, a rated load, an allowable use load, a limit load, a sensitivity, and the like, and the input pressure sensor 241, the output pressure sensor 242, and the return pressure sensor 243 also have fixed ID information, and the programmable logic controller 232 transmits the ID information to the programmable logic controller 232 by storing the ID information of each of the digital sensors 21, the input pressure sensor 241, the output pressure sensor 242, and the return pressure sensor 243 in the database 2322 when the digital sensors 21, the input pressure sensor 241, the output pressure sensor 242, or the return pressure sensor 243 are replaced or the system is restarted, the logic control unit 2321 compares the ID information of each of the digitalized sensor 21, the input pressure sensor 241, the output pressure sensor 242 or the return pressure sensor 243 in the system with the reference ID information stored in the database 2322, detects whether the digitalized sensor 21, the input pressure sensor 241, the output pressure sensor 242 or the return pressure sensor 243 is legal or valid, and if the ID information of the digitalized sensor 21, the input pressure sensor 241, the output pressure sensor 242 or the return pressure sensor 243 in the system is detected to be inconsistent with the reference ID information stored in the database 2322, controls the alarm unit 2323 to perform local warning, so that identity recognition of the digitalized sensor 21 is realized.
In addition, as shown in fig. 3, calibration data of each of the digitalized sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 is established in the database 2322 of the programmable logic controller 232, and parameter adjustment is performed on the digitalized sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 at each position in the system according to the calibration data of the digitalized sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 in the database 2322, so that on-line calibration of the digitalized sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 is realized, the digitalized sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 are not required to be detached for calibration, time is saved, and labor cost is reduced.
Next, as shown in fig. 3, the database 2322 of the programmable logic controller 232 stores normal working parameters and/or working life information of each component in the digital ultrafiltration system, and can determine whether the component needs to be replaced or maintained according to the normal working parameters and/or the working life information of each component, if so, the alarm unit 2323 is controlled to perform local warning, so that a function of predicting the working state of each component is realized, workers are reminded of replacement or maintenance in advance, faults are prevented, and working efficiency is improved.
As shown in fig. 2 and 3, in order to improve the stability of the system, in this embodiment of the present utility model, the control end 23 performs mutual checking of the working states with respect to the digitized sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 through interaction of handshake signals, a signal is given to the digitized sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 at each start-up of the control end 23, the digitized sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243 feed back a signal to the control end 23, the feedback signal includes ID information of each digitized sensor 21, the input pressure sensor 241, the output pressure sensor 242 and the return pressure sensor 243, the control end 23 performs comparison judgment on the fed back signal and corresponding ID information in the database 2322, and when the digitized sensor 21, the input pressure sensor 241, the output pressure sensor 242 or the return pressure sensor 243 have problems, or when a certain symptom needs to be processed but does not affect normal operation temporarily, and when the digitized sensor 21, the input pressure sensor 241, the output pressure sensor 242, the output pressure sensor 243 or the output pressure sensor 243 have a change within a warning range or a warning error, or an enable error is indicated when the alarm is used.
As shown in fig. 2, in order to prevent information loss, in this embodiment of the present utility model, the personal computer 231 and the programmable logic controller 232 perform mutual checking of the operation states through the interaction of the heartbeat signals. That is, every specific time, the programmable logic controller 232 sends a data packet to the computer 231, the personal computer 231 replies a message to the programmable logic controller 232 within the specific time after receiving the data packet, the programmable logic controller 232 determines whether the communication link between the two parties has been disconnected according to the condition that the programmable logic controller 232 sends the data packet and the personal computer 231 replies the message, and if the programmable logic controller 232 and the personal computer 231 cannot mutually receive the other party signals within the preset time, the personal computer 231 or the programmable logic controller 232 is determined to be down. In the case that one of the personal computer 231 and the programmable logic controller 232 is down, the other control system stops running and waits for the restart of the personal computer 231 or the programmable logic controller 232 in the down state; or the system continues to run, but the data is directly stored in the normal personal computer 231 or the programmable logic controller 232, and after restarting, the data is transmitted to the downtime side. Wherein, the preset time for judging whether the personal computer 231 or the programmable logic controller 232 is normal is not more than 1 minute.
As shown in fig. 2, the digital ultrafiltration system disclosed in the present utility model further includes at least one redundant network switch 3, each redundant network switch 3 corresponds to a group of personal computers 231 and programmable logic controllers 232, and the personal computers 231 and the programmable logic controllers 232 in each group respectively communicate with the corresponding redundant network switch 3, and in addition, in the case that more than one redundant network switch 3 is provided, the redundant network switches 3 mutually communicate and respectively communicate with one remote server 4. Through the arrangement of the redundant network switch 3 and the remote server 4, the redundant control of the local workstation and the remote workstation is realized, namely, the functions of remote parameter modification, remote online calibration and remote fault warning are realized. In addition, the remote server 4 can also realize cloud storage of information, store information of each part in each workstation system in the cloud, and store data information collection of each supplier in the cloud at the same time, so that later-period calling is facilitated, and information sharing between each supplier and a factory is realized.
The utility model also discloses a digital ultrafiltration method based on the digital ultrafiltration system, which comprises the following steps:
s0: inputting sample liquid from a liquid inlet of the input pipeline 11;
s1: the control end 23 selects corresponding transmembrane pressure index data according to the requirement of the required target permeate liquid to adjust the opening of the flow control valve 121 and the flow of the diaphragm pump 5, so that the difference value of the hydraulic pressure average value obtained by the detection of the input pressure sensor 241 and the reflux pressure sensor 243 minus the hydraulic pressure sensor obtained by the detection of the output pressure sensor 242 is the same as the transmembrane pressure index data;
s11: pumping the sample into an ultrafiltration membrane bag 6 through a diaphragm pump 5;
s2: the digital sensor 21 detects the index real-time data of the permeate outputted from the ultrafiltration membrane bag 6 and feeds back the index real-time data to the control end 23;
s3: the control end 23 collects real-time association relation between conductivity data and at least one environmental parameter data in index real-time data of the permeate liquid, compares the real-time association relation with target association relation between corresponding stored index target data, and judges whether the index target data are matched or not:
if yes, the target permeate is the target permeate, that is, the output valve 223 in the control actuator 22 acts to make the target permeate output;
if not, the non-standard permeate is obtained, that is, the non-standard permeate is introduced into the return line 12 to be mixed with the sample liquid and introduced into the ultrafiltration membrane bag 6 again by controlling the return valve 120 to act until the index real-time data of the permeate meets the index target data of the target permeate, and then the target permeate is output.
In summary, in the digital ultrafiltration system and method disclosed in the present utility model, the control end 23 selects the corresponding transmembrane pressure index data according to the requirement of the required target permeate to adjust the opening of the flow control valve 121 and the flow of the diaphragm pump 5, so that the difference value obtained by subtracting the hydraulic pressure sensor detected by the output pressure sensor 242 from the hydraulic pressure average value detected by the input pressure sensor 241 and the reflux pressure sensor 243 is the same as the transmembrane pressure index data, and permeate meeting the requirement is filtered out; meanwhile, the digital sensor 21 is adopted to replace a traditional analog sensor, other environmental parameter values except the electric conduction are transmitted to the control end, and corresponding electric conductivity data are selected for judgment by comparing the environmental parameters, so that the accuracy of an instruction sent by the control end is improved, and the ultrafiltration accuracy is improved.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the scope of the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art may still make modifications to the technical solutions described in the above embodiments without creative efforts, so as to obtain different technical solutions without substantially departing from the concept of the present utility model, and these technical solutions also belong to the scope of protection of the present utility model.
Claims (10)
1. A digital ultrafiltration system, comprising: the sample liquid sampling device comprises a circulation pipeline for inputting and outputting target permeate liquid with target real-time data meeting target data requirements of the target permeate liquid, at least one ultrafiltration membrane packet (6) connected to the circulation pipeline and arranged in parallel, and a control subsystem; the control subsystem includes: a plurality of groups of digital sensors (21) which are arranged on the flow pipeline and used for detecting index real-time data of the permeate; an input pressure sensor (241) and an output pressure sensor (242) which are arranged on the flow pipeline and used for respectively detecting the hydraulic pressure of the input end and the output end of the ultrafiltration membrane bag (6); an actuator (22) provided on the flow pipeline for controlling the flow state of each node of the flow pipeline; and a control end (23) connected with each of the digital sensors (21), the input pressure sensor (241) and the output pressure sensor (242) and controlling the action of the executing piece (22) so as to output the target permeate meeting the index target data requirement; wherein, the index target data corresponds to the index real-time data and comprises conductivity data and environment parameter data;
the digital sensor (21) detects the index real-time data of the permeate and feeds the index real-time data back to the control end (23); the control end (23) collects real-time association relations between conductivity data and at least one environmental parameter data in index real-time data of the permeate liquid, compares the real-time association relations with target association relations between corresponding index target data stored in the control end and judges whether the index real-time data are matched; and controlling each actuator (22) to act until the index real-time data of the permeate meets the index target data of the target permeate, and then outputting the target permeate.
2. The digital ultrafiltration system of claim 1, wherein the environmental parameter data comprises one or more of temperature data, volumetric flow rate data, mass flow rate data, ph data.
3. The digital ultrafiltration system of claim 1, wherein the flow-through circuit comprises: the input pipeline (11) is connected to the input end of the ultrafiltration membrane bag (6) and used for inputting the sample liquid; an output pipeline (13) connected to the output end of the ultrafiltration membrane bag (6) and used for outputting the permeate; and a return line (12) for connecting the output line (13) to the input line (11) and for returning the non-standard permeate to the input line (11).
4. A digital ultrafiltration system according to claim 3, characterized in that a reflux pressure sensor (243) and the digital sensor (21) are provided on the reflux line (12).
5. The digital ultrafiltration system of claim 4, wherein the actuator (22) comprises: the diaphragm pump (5) is arranged on the input pipeline (11), and the input valve (222) is used for controlling the on-off of the input pipeline (11); automatic valves (61) arranged at both sides of each ultrafiltration membrane bag (6); an output valve (223) provided in the output line (13) and controlling the output of the target permeate; and a return valve (120) and a flow control valve (121) provided to the return line (12).
6. The digital ultrafiltration system of claim 5, wherein the control side (23) comprises at least one personal computer (231) and at least one programmable logic controller (232) for data storage using a stack algorithm; the programmable logic controller (232) is provided with a database (2322) for storing target association relations between conductivity data and at least one environmental parameter data in the index target data and transmembrane pressure index data corresponding to each target permeate; -the programmable logic controller (232) controls the actuation of the actuator (22); the personal computer (231) and the programmable logic controller (232) communicate to realize data synchronization.
7. The digital ultrafiltration system according to claim 6, wherein the control terminal (23) and the digital sensor (21), the input pressure sensor (241), the output pressure sensor (242) and the return pressure sensor (243) are mutually checked for working status by interaction of handshake signals.
8. The digital ultrafiltration system of claim 6, wherein the personal computer (231) and the programmable logic controller (232) perform a mutual check of the working status by interaction of heartbeat signals.
9. The digital ultrafiltration system of claim 6, wherein the database (2322) further stores ID information and calibration data for the digital sensor (21), input pressure sensor (241), output pressure sensor (242), and return pressure sensor (243); the database (2322) also stores normal operating parameters and/or service life information of each component in the digital ultrafiltration system.
10. A digital ultrafiltration method based on the digital ultrafiltration system of claim 6, comprising: s1: the control end (23) selects corresponding transmembrane pressure index data according to the requirement of the required target permeate liquid, and adjusts the opening of the flow control valve (121) and the flow of the diaphragm pump (5); s2: the digital sensor (21) detects the index real-time data of the permeate and feeds the index real-time data back to the control end (23); s3: the control end (23) collects real-time association relations between conductivity data and at least one environmental parameter data in index real-time data of the permeate liquid, compares the real-time association relations with target association relations between corresponding index target data stored in the control end and judges whether the index real-time data are matched; and controlling each actuator (22) to act until the index real-time data of the permeate meets the index target data of the target permeate, and then outputting the target permeate.
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