CN113087077A - Energy-saving and consumption-reducing control system, method, device and medium for pressure type ultrafiltration membrane water purification system - Google Patents
Energy-saving and consumption-reducing control system, method, device and medium for pressure type ultrafiltration membrane water purification system Download PDFInfo
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Abstract
The invention discloses an energy-saving and consumption-reducing control system and method for a pressure type ultrafiltration membrane water purification system, a computer device and a storage medium. The control method comprises the steps of obtaining total water supply quantity required by all water inlet pumps, determining required transmembrane pressure difference according to a water production flux-transmembrane pressure difference relation model, a transmembrane pressure difference-pressure on pipeline model and a water inlet pump performance working curve model, determining working lifts required by all the water inlet pumps, determining water supply flow of the water inlet pumps according to the water inlet pump performance working curve model, and controlling the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to the determined running number of the water inlet pumps and the water supply flow of the running water inlet pumps. Through the whole-flow analysis of the pressure type ultrafiltration membrane filtration system, the key parameters and the energy consumption ratio of each sub-process unit are found out, an energy-saving and consumption-reducing model is established, and each key process parameter is collected and adjusted in real time, so that the optimal state of the integral ton water production energy consumption is realized. The invention is widely applied to the technical field of water treatment.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a pressure type ultrafiltration membrane water purification system energy-saving and consumption-reducing control system and method, a computer device and a storage medium.
Background
With the development of society, the public demands for water quality are higher and higher. The restriction of drinking water to the risk of cryptosporidium, giardia and other microorganisms, as well as to various disinfection by-products, is also becoming more and more stringent. The ultrafiltration membrane technology is an important technical breakthrough in the field of water treatment in recent years as a drinking water advanced treatment process. In recent years, with the progress of ultrafiltration membrane manufacturing technology, the price of membrane products is reduced, and ultrafiltration membrane treatment technology is adopted in more and more large municipal water supply plants in China. On the whole, the quality of the effluent water of the ultrafiltration membrane technology is excellent, the safety of microorganisms is high, and the effect of guaranteeing and improving the quality of the drinking water is obvious.
The ultrafiltration system mainly comprises three processes of pretreatment, ultrafiltration membrane, auxiliary unit including post-treatment and the like. Raw water in the raw water pool passes through a water inlet pump, passes through a pretreatment system, and is separated by an ultrafiltration membrane component to obtain clean produced water. And (4) carrying out post-treatment on the backwashing wastewater, discharging or refluxing the backwashing wastewater to the front end for retreatment.
The design of the pressure type ultrafiltration membrane in a large-scale water plant needs to consider the once-only fixed investment indexes such as the water production flux, the recovery rate and the like of the membrane, and more importantly, the operation cost indexes such as the power consumption, the cleaning agent consumption and the like of the membrane water production. Among these, the power consumption index of the water produced by the membrane system is a particularly important link. In the past, the common design idea of some small-sized ultrafiltration systems is to take the amount of filtered water in unit time and the quality of the filtered water body as design targets. Under the design idea, the water flow after filtration and whether the water quality meets the specified requirements are considered. The design idea only selects independent ultrafiltration process flows and process parameters (filtration, cleaning and aeration), only meets the feasibility principle, does not carry out optimization design, and particularly does not carry out energy-saving and consumption-reducing analysis of the whole flow. Some energy-saving operations are limited to manual decision and rough operation modes of field operation.
Disclosure of Invention
In view of at least one of the above technical problems, the present invention provides a system and a method for controlling energy saving and consumption reduction of a pressure-type ultrafiltration membrane water purification system, a computer device and a storage medium.
On one hand, the embodiment of the invention comprises a control method of an energy-saving and consumption-reducing control system of a pressure type ultrafiltration membrane water purification system, wherein the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system comprises a plurality of water inlet pumps and a plurality of membrane units, and the control method of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system comprises the following steps:
acquiring a water production flux-transmembrane pressure difference relation model, a transmembrane pressure difference-pressure on pipeline model and a water inlet pump performance working curve model;
acquiring the total water supply quantity required by all the water inlet pumps;
determining the water yield of the membrane unit according to the total water supply; the water yield of the membrane unit is the water yield required by the membrane unit;
determining the required transmembrane pressure difference according to the water yield of the membrane unit and the water yield-transmembrane pressure difference relation model;
determining the working lift of each water inlet pump required to be reached according to the transmembrane pressure difference and the transmembrane pressure difference-pipeline upper pressure model;
determining the running number of the water inlet pumps and the water supply flow of the running water inlet pumps required for reaching the working lift according to the water inlet pump performance working curve model;
and controlling the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to the determined running number of the water inlet pumps and the running water supply flow of the water inlet pumps.
Further, the obtaining of the produced water flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pressure on pipeline model and the intake pump performance working curve model comprises:
acquiring the operating parameters of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system; the operation parameters comprise the produced water flow, the produced water pressure, the filtering temperature, the turbidity and the valve opening and closing degree generated by the operation of the pressure type ultrafiltration membrane water purification system energy-saving consumption-reducing control system;
and fitting the operation parameters to obtain the produced water flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the intake pump performance working curve model.
Further, the control method of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system further comprises the following steps:
acquiring the operating parameters of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system; the operation parameters comprise the produced water flow, the produced water pressure, the filtering temperature, the turbidity and the valve opening and closing degree generated by the operation of the pressure type ultrafiltration membrane water purification system energy-saving consumption-reducing control system;
according to the operation parameters, performing simulation operation on the produced water flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the water inlet pump performance working curve model;
and optimizing the control of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to the result of the simulation operation.
Further, according to the result of the simulation operation, optimizing the control of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system comprises:
adding new influencing factors to the operating parameters; the new influencing factors comprise transmembrane pressure, filtration temperature and filtration time of different filtration stages;
and fitting the operation parameters added with the new influence factors so as to update the water production flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the intake pump performance working curve model.
On the other hand, the embodiment of the invention also comprises a pressure type ultrafiltration membrane water purification system energy-saving and consumption-reducing control system, which comprises:
a plurality of water inlet pumps;
a plurality of membrane units;
a PLC algorithm module; the PLC algorithm module is used for obtaining a water production flux-transmembrane pressure difference relation model, a transmembrane pressure difference-pressure on pipeline model and a water inlet pump performance working curve model, obtaining the total water supply required by all the water inlet pumps, and determining the water yield of the membrane unit according to the total water supply; the water yield of the membrane unit is the water yield required by the membrane unit, the required transmembrane pressure difference is determined according to the water yield of the membrane unit and the water yield flux-transmembrane pressure difference relation model, the working lift required by each water inlet pump is determined according to the transmembrane pressure difference and the transmembrane pressure difference-pipeline upper pressure model, the running number of the water inlet pumps required by the working lift and the water supply flow rate of the running water inlet pumps are determined according to the water inlet pump performance working curve model, and each water inlet pump is controlled according to the determined running number of the water inlet pumps and the water supply flow rate of the running water inlet pumps.
Furthermore, the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system also comprises a plurality of sensors;
the plurality of sensors are used for acquiring operation parameters; the operation parameters comprise the produced water flow, the produced water pressure, the filtering temperature, the turbidity and the valve opening and closing degree generated by the operation of the pressure type ultrafiltration membrane water purification system energy-saving consumption-reducing control system;
the PLC algorithm module is also used for fitting the operation parameters so as to obtain the produced water flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the intake pump performance working curve model.
Further, the plurality of sensors are also used for acquiring operation parameters; the operation parameters comprise the produced water flow, the produced water pressure, the filtering temperature, the turbidity and the valve opening and closing degree generated by the operation of the pressure type ultrafiltration membrane water purification system energy-saving consumption-reducing control system;
the PLC algorithm module is also used for carrying out simulation operation on the produced water flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the water inlet pump performance working curve model according to the operation parameters, and optimizing the control on the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to the result of the simulation operation.
Furthermore, the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system also comprises a fan, a backwashing pump, a dosing pump and an electromagnetic valve; the fan is used for aeration, the backwashing pump and the dosing pump are used for membrane cleaning of the membrane unit, and the electromagnetic valve is used for on-off control of the fan, the backwashing pump and the dosing pump.
In another aspect, an embodiment of the present invention further includes a computer device, which includes a memory and a processor, where the memory is used to store at least one program, and the processor is used to load the at least one program to execute a control method of the energy saving and consumption reducing control system of the pressure type ultrafiltration membrane water purification system.
In another aspect, embodiments of the present invention further include a storage medium having stored therein processor-executable instructions, which when executed by a processor, are configured to perform a control method of an energy saving and consumption reduction control system of a pressure type ultrafiltration membrane water purification system.
The invention has the beneficial effects that: the key parameters and the energy consumption ratio of each sub-process unit are found out through the whole-flow analysis of the pressure type ultrafiltration membrane filtration system, so that an energy-saving and consumption-reducing model is established, the key process parameters collected in real time are substituted into the model to perform further simulation analysis calculation, and the process parameters are adjusted in time, so that the optimal state of the energy consumption of the whole ton produced water is realized.
Drawings
FIG. 1 is a schematic diagram of the structure and principle of a pressure type ultrafiltration membrane water purification system energy saving and consumption reduction control system in an embodiment;
FIG. 2 is a circuit control diagram of an energy saving and consumption reducing control system of the pressure type ultrafiltration membrane water purification system in the embodiment;
FIG. 3 is a diagram showing the corresponding relationship between the water flow rate and the transmembrane pressure of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system and a logic diagram for dynamic control and adjustment in the embodiment;
FIG. 4 is a flow chart of a control method of the energy saving and consumption reduction control system of the pressure type ultrafiltration membrane water purification system in the embodiment;
FIG. 5 is a sub-step specifically included in step S1 in the embodiment;
FIG. 6 is a sub-step specifically included in step S10 in the embodiment;
FIG. 7 is a comparison of the energy saving effect of the automatic control of the energy saving and consumption reducing control system of the pressure type ultrafiltration membrane water purification system in the embodiment;
fig. 8 is a schematic diagram of energy-saving data summary of automatic control of the energy-saving and consumption-reducing control system of the pressure-type ultrafiltration membrane water purification system in the embodiment.
Detailed Description
In this embodiment, the structure and principle of the energy saving and consumption reducing control system of the pressure type ultrafiltration membrane water purification system are shown in fig. 1. Referring to fig. 1, the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system comprises a plurality of water inlet pumps and a plurality of membrane units, when the pressure type ultrafiltration membrane system operates, a plurality of water inlet pumps generally pump raw water from a water taking well, the raw water is pretreated by a plurality of pretreatment filters and then enters an ultrafiltration membrane device for filtration, and the obtained produced water enters a subsequent unit. After a period of filtration, the ultrafiltration membrane is subjected to physical and chemical cleaning to maintain the transmembrane pressure differential within a certain range. When cleaning, the aeration can be assisted, and the cleaning effect is enhanced.
Referring to fig. 1, the total water yield of the membrane stack and the liquid level of the suction well form closed-loop control to maintain the liquid level balance. The single membrane stack water inlet regulating valve and the single membrane stack water production form closed-loop control to complete the membrane stack water distribution. The variable frequency of the water inlet pump and the pressure of the membrane stack water inlet main pipe form closed-loop control to maintain the water inlet pressure of the membrane stack. And according to the rated flow given by the pump, the interlocking of the relation between the running quantity of the water inlet pumps and the total water yield of the membrane stack is realized. The membrane stack water inlet regulating valve control interval is increased, when the regulating valve is outside the interval, the pressure setting value of the membrane stack water inlet main pipe is automatically regulated, and the pressure loss of a pipeline caused by small opening degree of the regulating valve is reduced. And according to a variable rotating speed curve of the pump, the reasonable flow of the pump is automatically obtained according to the actual pump lift of the pump, the relation between the operation quantity of the water inlet pumps and the total water yield of the membrane stack is dynamically matched, and the pump is maintained to operate in a high-efficiency interval.
In this embodiment, referring to fig. 2, the energy saving and consumption reduction control system of the pressure type ultrafiltration membrane water purification system further includes a PLC algorithm module, a plurality of sensors, a fan, a backwash pump, a dosing pump, and an electromagnetic valve. Wherein the plurality of sensors includes an electromagnetic flow meter, a pressure sensor, a temperature sensor, a turbidity meter, a liquid level meter, and a gas flow meter. The sensor, the fan, the backwashing pump, the dosing pump and the electromagnetic valve are connected with the PLC algorithm module, and the PLC algorithm module is connected with the computer through the switch.
As shown in fig. 2, a computer with a computing software and SQL Server database is connected to the PLC algorithm module of the pressure-type ultrafiltration membrane filtration system through a switch. The PLC algorithm module controls each equipment unit by receiving signals from an electromagnetic flow meter, a gas flow meter, a pressure sensor, a temperature sensor, a turbidity meter and the like so as to realize actions such as switching on and off the electromagnetic valve of each corresponding pipeline, generating water by a water generating pump of the water generating equipment unit, aerating by a fan in the aerating unit, cleaning a membrane by a dosing pump and a backwashing pump of the cleaning unit and the like.
As shown in FIG. 3, the corresponding relationship between the ultrafiltration water production flow and the transmembrane pressure difference can be in different relevant regions along with the change of the inlet water quality (turbidity, temperature), membrane pollution and cleaning frequency. Therefore, the PLC algorithm module can collect real-time data of membrane operation, including various parameters such as pressure, flow and valve opening and closing degree, and carries out real-time analysis simulation calculation on the collected data according to a model of membrane water production flux and transmembrane pressure difference, and iteration of an energy-saving and consumption-reducing model is carried out according to the dynamic performance of the membrane, so that the water inlet pump is matched with the real-time water production condition of the ultrafiltration system, and the water inlet pump is enabled to be in a high-efficiency low-energy-consumption working interval to operate.
In this embodiment, a control method of the energy saving and consumption reduction control system of the pressure type ultrafiltration membrane water purification system is shown in fig. 4, and the control method includes the following steps:
s1, acquiring a water production flux-transmembrane pressure difference relation model, a transmembrane pressure difference-pipeline upper pressure model and a water inlet pump performance working curve model;
s2, acquiring the total water supply quantity required by all the water inlet pumps;
s3, determining the water yield of the membrane unit according to the total water supply amount; the water yield of the membrane unit is the water yield required by the membrane unit;
s4, determining the required transmembrane pressure difference according to the relation model of the water yield and the water yield flux of the membrane unit and the transmembrane pressure difference;
s5, determining the working lift of each water inlet pump required to be achieved according to the transmembrane pressure difference and transmembrane pressure difference-pipeline upper pressure model;
s6, determining the running number of the water inlet pumps and the water supply flow of the running water inlet pumps required for reaching the working lift according to the water inlet pump performance working curve model;
and S7, controlling the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to the determined running number of the water inlet pumps and the water supply flow of the running water inlet pumps.
In this embodiment, steps S1-S7 are executed by a PLC algorithm module. An alternative PLC algorithm is as follows:
expert liquid level control system algorithm:
comparing the current value of liquid level with the target value of liquid level control, and recording the current value and the variation according to different time bases
y2:＝y1；
y1:＝y0；
e2:＝e1；
e1:＝e0；
y0:＝PV；
e0:＝y0-SP；
Judging the direction of the liquid level change
e0_e1:＝e0-e1；
e1_e2:＝e1-e2；
e0_trend:＝e0*e0_e1；
e1_trend:＝e0_e1*e1_e2；
When the degree of deviation of the liquid level control target value represented by the variation value is different, the weights of proportional, integral and derivative actions in the expert liquid level control system are related with the deviation degree:
KpOutput:＝K3*K1*Kp*e0_e1；
KiOutput:＝K1*Ki*e0；
KdOutput:＝K1*Kd*y02y1y2；
total water supply required to be completed by the obtained pump:
OutputIncrement:＝KpOutput+KiOutput+KdOutput；
FTtotal:＝FTtotal+OutputIncrement；
and calculating the water yield required to be finished by the single set of membrane according to the total water supply.
According to the mathematical relation model of the membrane water yield-water yield flux-TMP, the water inlet pressure required by the membrane water inlet end to reach the membrane water yield is calculated
PTinlet＝PToutlet+TMP
PTinlet requires pressure for membrane water inlet side
Transmembrane pressure difference required by TMP to meet water production
PToutlet is the pressure actually measured on the water producing side of the membrane
When the membrane is in operation, the actual water production flux is calculated through the measured water production and the actual measured TMP is used for periodically correcting the mathematical relation model of the relation between the water production flux and the TMP
Data fitting (correction process)
aa＝[a1,a2,a3...an]
n＝length(aa)；
nn＝[1:1:n]；
nx＝ployfit(nn，aa，1)；
ny＝corrcoef(a,b)；
nz is poly val (nx, nn); % simulation use only
plot (nn, aa, 'r', nn, nz, 'b'); % simulation use only
TMP is transmembrane pressure difference
aa is the calculated TMP value
n is the data length
nx is a polynomial fitting coefficient
ny is a data correlation coefficient
nz is the value of the polynomial at nn
The hydraulic losses generated by a plurality of self-cleaning filters on the pipeline are different, and the dispersion analysis is carried out on the pressure difference measured values on different self-cleaning filters to obtain the reasonable pressure difference on the self-cleaning filters.
aa＝STDEV[a1,a2,a3...an]
bb＝AVERAGE[a1,a2,a3...an]
PTfilter＝GET[bb,aa,a1,a2,a3...an]
aa is the standard deviation of the differential pressure measurements across the plurality of self-cleaning filters
bb is the average of the measured values of the pressure difference over the self-cleaning filters
cc is the pressure differential measurement on the self-cleaning filter closest to the standard deviation
Obtaining static loss PTlose on pipeline through big data statistics
Through a pump head-flow-efficiency curve, a mathematical function of the pump head and the flow after limiting the efficiency range of the pump is obtained:
FTpump＝a2*H+b*H+c
h is pump head
a, b and c are polynomial coefficients which are obtained by calculation through a pump characteristic curve
FTpump is the theoretical flow of the pump in the efficiency interval
By means of the Flow value and the total water supply that the pump needs to complete, the number of pumps needed can be calculated
PumpNumRequired＝FTtotal/FTpump
PumpNumRerequired is the quantity theoretically required for the pump
Pump auto-increment and decrement program
IF PumpNumRequired>PumpNumRunning THEN
IncreasePump()；
ENDIF；
IF PumpNumRequired<PumpNumRunning THEN
DecreasePump()；
END_IF；
PumpNumRequired is the number theoretically required for the pump;
PumpNumRunning is the number of pumps running;
IncreasPomp adds a program entry to the pump;
decreasepump is a pump reduction program entry;
the pump lift change is realized by closed-loop control and regulation of the pump through a frequency converter.
In this embodiment, the produced water flux-transmembrane pressure difference relationship model, the transmembrane pressure difference-pipeline upper pressure model and the intake pump performance working curve model are all stored in the SQL Server database.
In this embodiment, when steps S1-S7 are executed, specifically, the water suction well is kept at a constant liquid level or within a certain liquid level allowable range by an expert control system, and then the total water supply parameter required by the water intake pump is obtained to calculate the water yield required by a single set of membrane unit in real time, at this time, the transmembrane pressure TMP required by the membrane is obtained through simulation calculation according to the water yield of the membrane unit and a relation model of water production flux and transmembrane pressure difference TMP, and the pressure required by the pump to work in real time, that is, the working lift of the pump, is obtained according to the TMP and the pressure model library on the pipeline. And the running number of the pumps and the water supply flow of a single pump are simulated when the pumps work in the high-efficiency interval by contrasting the performance working curve database of the pumps. According to the simulated data, the controller adjusts the running number of the pumps and the water supply flow of a single water pump, so that each water supply pump is optimized to be in an efficient working interval, the pressure loss on a pipeline is kept to be minimum, and the energy consumption ratio of ton produced water is optimal.
In this embodiment, step S1, that is, the step of obtaining a water flux-transmembrane pressure difference relationship model, a transmembrane pressure difference-pressure on pipeline model, and a water inlet pump performance working curve model, specifically includes the following steps as shown in fig. 5:
s101, obtaining operation parameters of an energy-saving and consumption-reducing control system of a pressure type ultrafiltration membrane water purification system; the operation parameters comprise the flow rate of produced water, the pressure of the produced water, the filtering temperature, the turbidity and the opening and closing degree of a valve, which are generated by the operation of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system;
and S102, fitting the operation parameters to obtain a water production flux-transmembrane pressure difference relation model, a transmembrane pressure difference-pressure on pipeline model and a water inlet pump performance working curve model.
In this embodiment, when step S102 is executed, the carding full-process ultrafiltration process correlates with the energy consumption of each device to find out the respective intrinsic relationship. Specifically, the whole process of ultrafiltration is analyzed, the proportion of energy consumption distribution is found for a pretreatment unit, an ultrafiltration separation unit and auxiliary units including post-treatment, all key process parameters are combed, and an energy-saving and consumption-reducing model of the pressure type ultrafiltration membrane system is established. The obtained water production flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the intake pump performance working curve model can be expressed in a combined way as follows:
in the formula, PIs effectiveIs the effective power of the pump, in kW; q is the flow rate of the pump, and the unit is m 3/hr; pPump outletIs the outlet pressure of the pump, in bar; pPump inletIs the inlet pressure of the pump in bar; delta P is the pressure loss along the way before the pump is pumped to the ultrafiltration membrane, and the unit is bar; TMP is ultrafiltration transmembrane pressure difference, and the unit is bar; pWater producing sideThe pressure of the ultrafiltration water production side is expressed in bar; etaPump and method of operating the samePump efficiency in percent; etaElectric machineThe efficiency of the motor is expressed as a percentage.
Through the formula, the power consumption of each process unit of the whole plant is carded, each process parameter can be effectively associated, the power consumption of the water inlet pump is optimized, and the power consumption of the pressure type ultrafiltration membrane water purification system can be effectively optimized because the power consumption of the water inlet pump accounts for 80% of the power consumption of the whole ultrafiltration filtration system.
In this embodiment, referring to fig. 4, the control method of the energy saving and consumption reducing control system of the pressure type ultrafiltration membrane water purification system further includes the following steps:
s8, obtaining operation parameters of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system; the operation parameters comprise the flow rate of produced water, the pressure of the produced water, the filtering temperature, the turbidity and the opening and closing degree of a valve, which are generated by the operation of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system;
s9, according to the operation parameters, carrying out simulation operation on a produced water flux-transmembrane pressure difference relation model, a transmembrane pressure difference-pipeline upper pressure model and a water inlet pump performance working curve model;
and S10, optimizing the control on the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to the simulation operation result.
In this embodiment, step S10, that is, the step of optimizing the control of the energy saving and consumption reducing control system of the pressure type ultrafiltration membrane water purification system according to the result of the simulation operation, specifically includes the following steps as shown in fig. 6:
s1001, adding new influence factors to the operation parameters; new influencing factors include transmembrane pressure, filtration temperature and filtration time at different filtration stages;
and S1002, fitting the operation parameters added with the new influence factors so as to update a water production flux-transmembrane pressure difference relation model, a transmembrane pressure difference-pipeline upper pressure model and a water inlet pump performance working curve model.
By executing the steps S8-S10, the water flow rate of the water inlet pump and the water flow rate of the ultrafiltration system are gradually matched through different automatic control strategies and associated actions, so that the water inlet pump is in the high-efficiency low-energy-consumption working interval, and the effect is shown in fig. 7. As shown in fig. 8, data was run for three consecutive days, showing a numerical comparison of stepwise automatic control optimizing energy consumption.
Compared with the prior art, the energy-saving and consumption-reducing control system and method for the pressure type ultrafiltration membrane water purification system in the embodiment have the following advantages:
1) the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system in the embodiment can realize long-term stable operation with high efficiency and low energy consumption;
2) the energy-saving and consumption-reducing control system and method for the pressure type ultrafiltration membrane water purification system in the embodiment can realize traditional flow control, and meanwhile, an original fixed control mode is changed into a combined control operation mode which can intelligently match the number of water inlet pumps and a working flow interval according to specific actual water production conditions by calling an algorithm function block and a communication program, so that low energy consumption and high efficiency are realized;
3) the energy-saving and consumption-reducing control system and method for the pressure type ultrafiltration membrane water purification system in the embodiment can make analysis feedback aiming at actual data on site, so that an optimal membrane operation parameter method is selected instead of a rough operation method;
4) the energy-saving and consumption-reducing control system and method for the pressure type ultrafiltration membrane water purification system in the embodiment can also transplant algorithms according to different water production scales, and are suitable for water plants with different scales and different types of membrane systems.
In this embodiment, a computer device includes a memory and a processor, where the memory is used to store at least one program, and the processor is used to load the at least one program to execute the control method of the energy saving and consumption reducing control system of the pressure type ultrafiltration membrane water purification system in this embodiment.
In the embodiment, a storage medium stores processor-executable instructions, and the processor-executable instructions are used for executing the control method of the energy saving and consumption reducing control system of the pressure-type ultrafiltration membrane water purification system in the embodiment when being executed by a processor, so that the same technical effects as those described in the embodiment are achieved.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the descriptions of upper, lower, left, right, etc. used in the present disclosure are only relative to the mutual positional relationship of the constituent parts of the present disclosure in the drawings. As used in this disclosure, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, unless defined otherwise, all technical and scientific terms used in this example have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description of the embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this embodiment, the term "and/or" includes any combination of one or more of the associated listed items.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples, or exemplary language ("e.g.," such as "or the like") provided with this embodiment is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object terminal oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, operations of processes described in this embodiment can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described in this embodiment (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described in this embodiment includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein.
A computer program can be applied to input data to perform the functions described in the present embodiment to convert the input data to generate output data that is stored to a non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the present invention, the transformed data represents a physical and tangible target terminal, including a particular visual depiction of the physical and tangible target terminal produced on a display.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.
Claims (10)
1. A control method of a pressure type ultrafiltration membrane water purification system energy saving and consumption reduction control system is characterized in that the control method of the pressure type ultrafiltration membrane water purification system energy saving and consumption reduction control system comprises a plurality of water inlet pumps and a plurality of membrane units, and comprises the following steps:
acquiring a water production flux-transmembrane pressure difference relation model, a transmembrane pressure difference-pressure on pipeline model and a water inlet pump performance working curve model;
acquiring the total water supply quantity required by all the water inlet pumps;
determining the water yield of the membrane unit according to the total water supply; the water yield of the membrane unit is the water yield required by the membrane unit;
determining the required transmembrane pressure difference according to the water yield of the membrane unit and the water yield-transmembrane pressure difference relation model;
determining the working lift of each water inlet pump required to be reached according to the transmembrane pressure difference and the transmembrane pressure difference-pipeline upper pressure model;
determining the running number of the water inlet pumps and the water supply flow of the running water inlet pumps required for reaching the working lift according to the water inlet pump performance working curve model;
and controlling the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to the determined running number of the water inlet pumps and the running water supply flow of the water inlet pumps.
2. The control method of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to claim 1, wherein the obtaining of the produced water flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pressure on pipeline model and the intake pump performance working curve model comprises:
acquiring the operating parameters of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system; the operation parameters comprise the produced water flow, the produced water pressure, the filtering temperature, the turbidity and the valve opening and closing degree generated by the operation of the pressure type ultrafiltration membrane water purification system energy-saving consumption-reducing control system;
and fitting the operation parameters to obtain the produced water flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the intake pump performance working curve model.
3. The control method of the energy saving and consumption reducing control system of the pressure type ultrafiltration membrane water purification system according to claim 1 or 2, wherein the control method of the energy saving and consumption reducing control system of the pressure type ultrafiltration membrane water purification system further comprises:
acquiring the operating parameters of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system; the operation parameters comprise the produced water flow, the produced water pressure, the filtering temperature, the turbidity and the valve opening and closing degree generated by the operation of the pressure type ultrafiltration membrane water purification system energy-saving consumption-reducing control system;
according to the operation parameters, performing simulation operation on the produced water flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the water inlet pump performance working curve model;
and optimizing the control of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to the result of the simulation operation.
4. The method for controlling the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to claim 3, wherein the optimizing the control of the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to the result of the simulation operation comprises:
adding new influencing factors to the operating parameters; the new influencing factors comprise transmembrane pressure, filtration temperature and filtration time of different filtration stages;
and fitting the operation parameters added with the new influence factors so as to update the water production flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the intake pump performance working curve model.
5. The utility model provides a pressure type milipore filter water purification system energy saving and consumption reduction control system which characterized in that includes:
a plurality of water inlet pumps;
a plurality of membrane units;
a PLC algorithm module; the PLC algorithm module is used for obtaining a water production flux-transmembrane pressure difference relation model, a transmembrane pressure difference-pressure on pipeline model and a water inlet pump performance working curve model, obtaining the total water supply required by all the water inlet pumps, and determining the water yield of the membrane unit according to the total water supply; the water yield of the membrane unit is the water yield required by the membrane unit, the required transmembrane pressure difference is determined according to the water yield of the membrane unit and the water yield flux-transmembrane pressure difference relation model, the working lift required by each water inlet pump is determined according to the transmembrane pressure difference and the transmembrane pressure difference-pipeline upper pressure model, the running number of the water inlet pumps required by the working lift and the water supply flow rate of the running water inlet pumps are determined according to the water inlet pump performance working curve model, and each water inlet pump is controlled according to the determined running number of the water inlet pumps and the water supply flow rate of the running water inlet pumps.
6. The energy conservation and consumption reduction control system of the pressure type ultrafiltration membrane water purification system according to claim 5, wherein the energy conservation and consumption reduction control system of the pressure type ultrafiltration membrane water purification system further comprises a plurality of sensors;
the plurality of sensors are used for acquiring operation parameters; the operation parameters comprise the produced water flow, the produced water pressure, the filtering temperature, the turbidity and the valve opening and closing degree generated by the operation of the pressure type ultrafiltration membrane water purification system energy-saving consumption-reducing control system;
the PLC algorithm module is also used for fitting the operation parameters so as to obtain the produced water flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the intake pump performance working curve model.
7. The pressure type ultrafiltration membrane water purification system energy saving and consumption reduction control system according to claim 5 or 6, which is characterized in that:
the plurality of sensors are further used for acquiring operating parameters; the operation parameters comprise the produced water flow, the produced water pressure, the filtering temperature, the turbidity and the valve opening and closing degree generated by the operation of the pressure type ultrafiltration membrane water purification system energy-saving consumption-reducing control system;
the PLC algorithm module is also used for carrying out simulation operation on the produced water flux-transmembrane pressure difference relation model, the transmembrane pressure difference-pipeline upper pressure model and the water inlet pump performance working curve model according to the operation parameters, and optimizing the control on the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to the result of the simulation operation.
8. The energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system according to claim 5 or 6, wherein the energy-saving and consumption-reducing control system of the pressure type ultrafiltration membrane water purification system further comprises a fan, a backwashing pump, a dosing pump and an electromagnetic valve; the fan is used for aeration, the backwashing pump and the dosing pump are used for membrane cleaning of the membrane unit, and the electromagnetic valve is used for on-off control of the fan, the backwashing pump and the dosing pump.
9. A computer apparatus comprising a memory for storing at least one program and a processor for loading the at least one program to perform the method of any one of claims 1 to 4.
10. A storage medium having stored therein processor-executable instructions, which when executed by a processor, are configured to perform the method of any one of claims 1-4.
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