CN110966171B - Flow control method, device and system of diaphragm pump and medium - Google Patents
Flow control method, device and system of diaphragm pump and medium Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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Abstract
The invention discloses a flow control method and a device of a diaphragm pump, comprising the following steps: acquiring the average flow Q3 of the isolation pump in different frequencies for a period of time; calculating the sludge overflow flow Q1-Q3/K under different frequencies through Q3, wherein K is a preset value; obtaining a frequency coefficient of each frequency interval according to the sludge overflow instantaneous flow Q1; and determining a frequency interval and a corresponding frequency coefficient according to the sludge overflow flow Q1 to obtain the operating frequency of the diaphragm pump, thereby realizing flow control. The flow control method and the flow control device of the diaphragm pump have the advantages of high control precision, smooth dosing and the like.
Description
Technical Field
The invention mainly relates to the technical field of sludge treatment, in particular to a flow control method, a flow control device, a flow control system and a flow control medium of a diaphragm pump.
Background
After the sludge is pretreated and anaerobically digested, the sludge needs to be dewatered to carry out the next treatment. In the process, the digested sludge needs to be added with ferric trichloride to adjust sludge property before entering the plate frame, the ferric trichloride belongs to a strong-corrosivity medicament, and only the diaphragm pump has strong corrosion resistance in the existing equipment at present, so that the dosing operation of the ferric trichloride can be realized.
The anaerobic sludge digestion process adopts a natural overflow sludge discharge mode at present, the overflow flow Q1 of the anaerobic sludge digestion process is in a curve shape between 0 and 150 cubic meters per hour (as shown in figure 1), the height of an overflow port can be manually adjusted according to the process requirements, and the sludge amount entering a digestion tank every time is different (the overflow amount can be influenced), so the flow curve characteristics of the digested sludge are changed. According to the subsequent process requirements, ferric trichloride with a fixed proportion of K (0.01) needs to be added into the overflowed sludge, namely the adding flow rate of the ferric trichloride is Q2-KQ 1-0.01Q 1, and the curve characteristic of the ferric trichloride is consistent with the overflow flow rate Q1 so as to meet the process requirements.
Ferric trichloride is a strong corrosive medicament, and a diaphragm dosing pump is the only ideal pumping equipment. The diaphragm pump has a disadvantage in that the output flow rate Q2 (instantaneous flow rate) has a pulse phenomenon (as shown in fig. 2, data measured when the 2-cubic diaphragm pump is operated at 20 HZ), and the medium cannot be smoothly output.
As can be seen from fig. 1, Q1 changes in a curve during operation, while Q1 is relatively stable in a short time (e.g., one minute), and since Q2 is KQ1 and K is a fixed ratio, Q2 should also reach a stable value to meet the process requirements. In this case, the operating frequency H (0 to 50HZ) of the diaphragm pump is controlled by the PID control method, and the output flow rate Q2 of the diaphragm pump is controlled. The PID regulation method should also give an operating frequency H in the form of pulses in order to stabilize the output flow Q2, depending on the flow characteristics (pulsing) of the diaphragm pump. In the actual operation process, because the output flow of the diaphragm pump changes too much (under the condition of constant frequency), the adjusting time of the PID adjusting method is relatively too long, and the stable output Q2 of the diaphragm pump cannot be realized at all (as shown in FIG. 3, the overflow flow of the sludge of the diaphragm pump is 30-110 m)3The operating frequency in/h), the process requirement of dosing in the overflowing medium according to the fixed proportion K cannot be met.
Currently, the related patent documents are:
(1) the utility model patent application No. CN201420611331.4 provides a "diaphragm pump flow control system", and this system has the following defects: the output flow of the diaphragm pump still has a pulse phenomenon. Secondly, the pumping flow cannot be accurately controlled, and only remote start and stop can be realized, and the flow can be roughly controlled by controlling the opening of the regulating valve.
(2) The utility model patent of application No. cn201520230732.x provides "a flow stabilizing device for a diaphragm pump", which has the following drawbacks: firstly, the flow stabilizing diaphragm pump of the device can only output one flow value and cannot adjust the flow; and the flow output by the device still has pulse phenomenon.
(3) The invention patent of application number CN201611060812.0 provides an intelligent digital mixed fertilizer acid and alkali regulation liquid level control device, which has the following defects: firstly, a flow characteristic curve of a diaphragm pump is not determined, and whether the flow characteristic curve is instantaneous flow or accumulated flow and how the curve characteristic is; and secondly, how to calculate the signal duty ratio of the frequency converter of the diaphragm pump is not determined.
(4) The invention patent of application number CN201611249334.8 provides a "current stabilization and voltage stabilizer for pneumatic double diaphragm pump", which has the following defects: firstly, the device can reduce the fluctuation amplitude of the output flow of the diaphragm pump to a certain extent, but the pulse phenomenon still exists;
in addition, in order to reduce the pulsation phenomenon of the diaphragm pump, many kinds of devices are used, and the amplitude of the pulsation can be reduced by installing a buffer device (damper or the like) on the pipeline, but the pulsation phenomenon cannot be eliminated. If a device is provided to eliminate the pulse phenomenon of the diaphragm pump, the PID control method can well realize the curvilinear dosing, which leads to the increase of the cost.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a flow control method, a device, a system and a medium of a diaphragm pump, which have high control precision and smooth dosing.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a flow control method of a diaphragm pump includes the steps of:
s01, acquiring the average flow Q3 of the diaphragm pump in a period of time under different frequencies;
s02, calculating the sludge overflow flow Q1-Q3/K under different frequencies through Q3, wherein K is a preset value;
s03, obtaining the frequency coefficient of each frequency interval according to the sludge overflow flow Q1;
and S04, determining a frequency interval and a corresponding frequency coefficient according to the sludge overflow flow Q1 to obtain the operating frequency of the diaphragm pump, thereby realizing flow control.
As a further improvement of the above technical solution, in step S01, the average flow Q3 is obtained when the diaphragm pump is in an actual operating environment.
As a further improvement of the above solution, in step S01, 10 frequencies are H11-H20, where H11-5 HZ, H12-10 HZ, H13-15 HZ, H14-20 HZ, H15-25 HZ, H16-30 HZ, H17-35 HZ, H18-40 HZ, H19-45 HZ, and H20-50 HZ.
As a further improvement of the technical proposal, in step S02, Q1 corresponds to the flow rates of H11-H20 of each frequency Q11-Q20, wherein K is 0.005-0.05.
As a further improvement of the above technical solution, in step S03, the frequency coefficients corresponding to the frequency intervals corresponding to Q11-Q20 are K11-K20; wherein K11 ═ Q11/H11, K12 ═ Q12 (Q12-Q12)/(H12-H12), K12 ═ Q12 (Q12-Q12)/(H12), K12 ═ K12 (Q12-Q12)/(H12-H12), K12 ═ Q12 (Q12-Q12)/(H12-H12), and K12 ═ K12 (Q12-Q12)/(H12-H12).
As a further improvement of the above technical solution, the specific step of step S04 is:
4.1) in the operation process, determining the dosing flow rate Q2-KQ 1 required by the diaphragm pump according to the sludge overflow flow rate Q1;
4.2) determining a frequency interval H1n-H1(n +1) and a frequency coefficient K1(n +1) of the corresponding interval according to the flow interval where Q2 is located, wherein the operating frequency H of the diaphragm pump is (Q2-Q1n)/K1(n +1) + H1 n.
The invention also discloses a flow control device of the diaphragm pump, which comprises a sludge overflow flow detection piece and a control unit, wherein the sludge overflow flow detection piece is connected with the control unit and is used for detecting the sludge overflow flow in real time and sending the sludge overflow flow to the control unit, and the control unit controls the operation frequency of the dosing pump frequency converter according to the sludge overflow flow so as to realize flow control.
The invention further discloses a flow control system of the diaphragm pump, which comprises
The device comprises a first module, a second module and a third module, wherein the first module is used for acquiring the average flow Q3 of the diaphragm pump in a period of time under different frequencies;
the second module is used for calculating the sludge overflow flow Q1-Q3/K under different frequencies through Q3, wherein K is a preset value;
the third module is used for obtaining the frequency coefficient of each frequency interval according to the sludge overflow flow Q1;
and the fourth module is used for determining a frequency interval and a corresponding frequency coefficient according to the sludge overflow flow Q1 to obtain the operating frequency of the diaphragm pump, so that the flow control is realized.
The invention also discloses a computer readable storage medium having a computer program stored thereon, characterized in that the computer program, when being executed by a processor, performs the steps of the flow control method of a diaphragm pump as described above.
The invention further discloses a computer arrangement comprising a memory and a processor, said memory having stored thereon a computer program, characterized in that said computer program, when being executed by the processor, performs the steps of the flow control method of a membrane pump as described above.
Compared with the prior art, the invention has the advantages that:
according to the flow control method of the diaphragm pump, the frequency coefficient of each frequency section of the diaphragm pump is obtained by adopting a test method, and then the final operation frequency of the diaphragm pump is obtained according to the sludge overflow flow Q1 and the corresponding frequency coefficient, so that smooth dosing is realized, the dosing stability is improved, and the influence caused by the pulse phenomenon of the existing instantaneous flow is avoided. The control device of the invention is used for executing the method, has the advantages of the method, and has simple structure and convenient operation.
Drawings
FIG. 1 is a graph of the overflow flow rate of sludge in the prior art.
FIG. 2 is a graph of instantaneous flow rate for a diaphragm pump operating at 20Hz in the prior art.
FIG. 3 shows the overflow flow of sludge of 30-110m in the prior art3Operating frequency diagram between/h.
FIG. 4 is a flow chart of an embodiment of the method of the present invention.
FIG. 5 is a flow characteristic diagram of an embodiment of a diaphragm pump of the present invention.
FIG. 6 is a graph showing the operating frequency of the diaphragm pump of the present invention at a sludge overflow rate of 30-110m 3/h.
Fig. 7 is a control block diagram of the apparatus of the present invention in an embodiment.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 4, a flow control method of a diaphragm pump includes the steps of:
s01, acquiring the average flow Q3 of the diaphragm pump in a period of time under different frequencies;
s02, calculating sludge overflow flow Q1 under different frequencies to Q3/K through Q3, wherein K is a preset value and is the ratio of the medicine adding amount to the sludge overflow flow;
s03, obtaining the frequency coefficient of each frequency interval according to the sludge overflow flow Q1;
and S04, determining a frequency interval and a corresponding frequency coefficient according to the sludge overflow flow Q1 to obtain the operating frequency of the diaphragm pump, thereby realizing flow control.
According to the flow control method of the diaphragm pump, the frequency coefficient of each frequency section of the diaphragm pump is obtained by adopting a test method, and then the final operation frequency of the diaphragm pump is obtained according to the sludge overflow flow Q1 and the corresponding frequency coefficient, so that smooth dosing is realized, the dosing stability is improved, and the influence caused by the pulse phenomenon of the existing instantaneous flow is avoided.
In this embodiment, the flow characteristic of the on-site diaphragm pump is determined, where the flow characteristic of the diaphragm pump is related to the on-site actual installation situation, for example, the flow of the diaphragm pump is affected by the delivery pipe diameter, length, number of elbows, valves, and the viscosity of the chemical. Therefore, in order to improve the control accuracy, in step S01, the average flow rate Q3 is obtained when the diaphragm pump is in an actual operating environment.
In this embodiment, when the sludge overflow flow rate of the digestion tank is 0-150 cubic/hr (as shown in fig. 1), the adding proportion of ferric trichloride is K (0.01), and the chemical feeding pump is an electric diaphragm pump, the average flow rate Q3 of the diaphragm pump running for two hours at 10 frequency points of H11-H20 is calculated by the chemical feeding flow meter after the sludge overflow flow rate meter, the chemical feeding flow rate meter, the diaphragm pump (2 cubic), the diaphragm pump frequency converter (3kw), the PLC control system (siemens) and the related pipelines are installed, wherein H11 ═ 5HZ, H12 ═ 10HZ, H13 ═ 15HZ, H14 ═ 20HZ, H15 ═ 25HZ, H16 ═ 30HZ, H17 ═ 35HZ, H18 ═ 40HZ, H19 ═ 45HZ, and H20 ═ 50 HZ. Of course, to improve accuracy, the accumulated time may be delayed appropriately; in other embodiments, the operating frequency of the diaphragm pump (0-50HZ) may be equally divided into 15, 20, 25, or other equal parts, with the more fractions, the closer the curve between the two is to a straight line. For the diaphragm pump with small flow and little change of flow characteristics, measuring points can be taken less, for example, 10 measuring points can be taken for a 2-side pump, so that certain measuring work is saved and PLC programs are reduced;
after obtaining the average flow rate Q3 at each frequency point, the sludge overflow flow rates Q1, Q1 being KQ3 at the ten frequency points were calculated, and Q1 corresponding to the ten measurement points were Q11(6.25 m) respectively (Q3 is calculated)3/h)、Q12(15m3/h)、Q13(30m3/h)、Q14(51m3/h)、Q15(69.38m3/h)、Q16(90.75m3/h)、Q17(116.25m3/h)、Q18(142m3/h)、Q19(170.16m3/h)、Q20(198.75m3/h)；
According to the flow Q1, the frequency coefficient K11(1.25 m) of the ten intervals is calculated3/h·Hz)、K12(1.75m3/h·Hz)、K13(3m3/h·Hz)、K14(4.2m3/h·Hz)、K15(3.676m3/h·Hz)、K16(4.274m3/h·Hz)、K17(5.1m3/h·Hz)、K18(5.15m3/h·Hz)、K19(5.632m3/h·Hz)、K20(5.718m3H Hz), the calculation formula is: k11 ═ Q11/H11, K12 ═ Q12 (Q12-Q12)/(H12-H12), K12 ═ Q12 (Q12-Q12)/(H12), K12 ═ K12 (Q12-Q12)/(H12-H12), K12 ═ K12 (Q12-Q12)/(H12-H12), K12 ═ Q12-Q12 (Q12-Q12)/(H12-H12), K12 ═ Q12 (Q12-Q12)/(H12-H12) and K12);
and then drawing a diaphragm pump flow characteristic diagram according to the related data of the ten measuring points, as shown in figure 4. According to the flow characteristic of the diaphragm pump, a calculation formula of the given frequency H of the frequency converter is obtained, and the calculation process is as follows: in the operation process, the overflow flow of the sludge is Q1, the dosing flow required to be dosed by the diaphragm pump is Q2-KQ 1, a frequency interval (such as between Q16 and Q17) and a relevant frequency coefficient (such as K17) are determined according to the flow interval where Q2 is located, and then the frequency H-set frequency of the frequency converter is (Q2-Q16)/K17+ H16-set frequency (Q2-90.75)/5.1+30 (Hz); then according to a calculation formula of the given frequency of the frequency converter, writing out a PLC program corresponding to the ten flow intervals for use;
during the use process, the operation frequency of the diaphragm pump is stable (as shown in figure 6, the diaphragm pump overflows 30-110m in the sludge at the flow rate3The running frequency between/h) does not appear jumping, and the medicament with a fixed proportion can be added according to the process requirement, thereby providing powerful guarantee for the subsequent dehydration process.
As shown in fig. 7, the invention further discloses a flow control device of a diaphragm pump, which comprises a sludge overflow flow detection piece and a control unit, wherein the sludge overflow flow detection piece is connected with the control unit and is used for detecting the sludge overflow flow Q1 in real time and sending the detected sludge overflow flow Q1 to the control unit, the control unit obtains the corresponding operation frequency H of the dosing pump according to the sludge overflow flow Q1 by the method, and the control unit controls the frequency converter of the dosing pump to operate according to the operation frequency so as to realize flow control. The control device of the invention is used for executing the method, has the advantages of the method, and has simple structure and convenient operation.
The invention also discloses a flow control system of the diaphragm pump, which comprises
The device comprises a first module, a second module and a third module, wherein the first module is used for acquiring the average flow Q3 of the diaphragm pump in a period of time under different frequencies;
the second module is used for calculating the sludge overflow flow Q1-Q3/K under different frequencies through Q3, wherein K is a preset value;
the third module is used for obtaining the frequency coefficient of each frequency interval according to the sludge overflow flow Q1;
and the fourth module is used for determining a frequency interval and a corresponding frequency coefficient according to the sludge overflow flow Q1 to obtain the operating frequency of the diaphragm pump, so that the flow control is realized.
The invention further discloses a computer readable storage medium having stored thereon a computer program which, when being executed by a processor, performs the steps of the flow control method of a diaphragm pump as described above. The invention also discloses a computer device comprising a memory and a processor, wherein the memory is stored with a computer program, and the computer program executes the steps of the flow control method of the diaphragm pump when the computer program is executed by the processor. All or part of the flow of the method of the embodiments may be implemented by a computer program, which may be stored in a computer-readable storage medium and executed by a processor, to implement the steps of the embodiments of the methods. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. The memory may be used to store computer programs and/or modules, and the processor may perform various functions by executing or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (9)
1. A flow control method of a diaphragm pump is characterized by comprising the following steps:
s01, acquiring the average flow Q3 of the diaphragm pump in a period of time under different frequencies;
s02, calculating the sludge overflow flow Q1-Q3/K under different frequencies through Q3, wherein K is a preset value;
s03, obtaining the frequency coefficient of each frequency interval according to the sludge overflow flow Q1;
and S04, determining a frequency interval and a corresponding frequency coefficient according to the sludge overflow flow Q1 to obtain the operating frequency of the diaphragm pump, thereby realizing flow control.
2. The flow control method of the diaphragm pump according to claim 1, wherein in step S01, the average flow Q3 is obtained when the diaphragm pump is in an actual operating environment.
3. The flow control method of a diaphragm pump according to claim 1 or 2, wherein in step S01, 10 frequencies are H11-H20, wherein H11-5 HZ, H12-10 HZ, H13-15 HZ, H14-20 HZ, H15-25 HZ, H16-30 HZ, H17-35 HZ, H18-40 HZ, H19-45 HZ, and H20-50 HZ.
4. The flow control method of a diaphragm pump according to claim 3, wherein in step S02, Q1 corresponds to the flow rates of frequencies H11-H20, Q11-Q20, respectively, where K is 0.005-0.05.
5. The flow control method of a diaphragm pump according to claim 4, wherein in step S03, the frequency coefficient corresponding to the frequency interval corresponding to Q11-Q20 is K11-K20; wherein K11 ═ Q11/H11, K12 ═ Q12 (Q12-Q12)/(H12-H12), K12 ═ Q12 (Q12-Q12)/(H12), K12 ═ K12 (Q12-Q12)/(H12-H12), K12 ═ Q12 (Q12-Q12)/(H12-H12), and K12 ═ K12 (Q12-Q12)/(H12-H12).
6. The flow control method of a diaphragm pump according to claim 5, wherein the step S04 specifically comprises the steps of:
4.1) in the operation process, determining the dosing flow rate Q2-KQ 1 required by the diaphragm pump according to the sludge overflow flow rate Q1;
4.2) determining a frequency interval H1n-H1(n +1) and a frequency coefficient K1(n +1) of the corresponding interval according to the flow interval where Q2 is located, wherein the operating frequency H of the diaphragm pump is (Q2-Q1n)/K1(n +1) + H1 n.
7. A flow control system for a diaphragm pump, comprising
The device comprises a first module, a second module and a third module, wherein the first module is used for acquiring the average flow Q3 of the diaphragm pump in a period of time under different frequencies;
the second module is used for calculating the sludge overflow flow Q1-Q3/K under different frequencies through Q3, wherein K is a preset value;
the third module is used for obtaining the frequency coefficient of each frequency interval according to the sludge overflow flow Q1;
and the fourth module is used for determining a frequency interval and a corresponding frequency coefficient according to the sludge overflow flow Q1 to obtain the operating frequency of the diaphragm pump, so that the flow control is realized.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the flow control method of a diaphragm pump according to any one of claims 1-6.
9. A computer arrangement comprising a memory and a processor, the memory having stored thereon a computer program, characterized in that the computer program, when being executed by the processor, performs the steps of the flow control method of a membrane pump according to any one of the claims 1-6.
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| JPH0291485A (en) * | 1988-09-27 | 1990-03-30 | Teijin Ltd | Liquid quantitative supply device |
| DE202008001131U1 (en) * | 2008-01-26 | 2008-04-03 | Pauly Gmbh | Automatic venting for piston and diaphragm pumps |
| CN103570190A (en) * | 2013-10-20 | 2014-02-12 | 北京化工大学 | Method for controlling feeding amount of chemical phosphorus removal reagents of water reclamation plants based on fuzzy control |
| CN203771038U (en) * | 2014-03-03 | 2014-08-13 | 陕西雷光环保科技有限公司 | Chemical adding device |
| CN207877439U (en) * | 2017-12-26 | 2018-09-18 | 中原环保股份有限公司 | A kind of accurate medicine system of wastewater disinfection |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0291485A (en) * | 1988-09-27 | 1990-03-30 | Teijin Ltd | Liquid quantitative supply device |
| DE202008001131U1 (en) * | 2008-01-26 | 2008-04-03 | Pauly Gmbh | Automatic venting for piston and diaphragm pumps |
| CN103570190A (en) * | 2013-10-20 | 2014-02-12 | 北京化工大学 | Method for controlling feeding amount of chemical phosphorus removal reagents of water reclamation plants based on fuzzy control |
| CN203771038U (en) * | 2014-03-03 | 2014-08-13 | 陕西雷光环保科技有限公司 | Chemical adding device |
| CN207877439U (en) * | 2017-12-26 | 2018-09-18 | 中原环保股份有限公司 | A kind of accurate medicine system of wastewater disinfection |
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