CN210237300U - Oxidation-reduction potential accurate control system for reverse osmosis device - Google Patents
Oxidation-reduction potential accurate control system for reverse osmosis device Download PDFInfo
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- CN210237300U CN210237300U CN201920597854.0U CN201920597854U CN210237300U CN 210237300 U CN210237300 U CN 210237300U CN 201920597854 U CN201920597854 U CN 201920597854U CN 210237300 U CN210237300 U CN 210237300U
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Abstract
The utility model discloses an oxidation-reduction potential accurate control system for a reverse osmosis device, which comprises a sodium hypochlorite metering pump, a first reducing agent metering pump, a second reducing agent metering pump, a first online oxidation-reduction potential tester, a second online oxidation-reduction potential tester and a pump controller; the reverse osmosis system comprises a booster pump, a water purification station, a chemical clean water tank, a multi-medium filter and a reverse osmosis device which are sequentially communicated through pipelines; and the pump controller is used for respectively controlling the working frequency or the opening degree of the sodium hypochlorite metering pump, the first reducing agent metering pump and the second reducing agent metering pump. The utility model discloses an oxidation-reduction potential accurate control system for reverse osmosis unit can be accurately with the ORP control of reverse osmosis unit's import department in suitable within range to organic matter, the microorganism of reverse osmosis unit's import department can be avoided breeding, reverse osmosis membrane's oxidation can be prevented again, it is good to ensure reverse osmosis system operating condition.
Description
Technical Field
The utility model relates to a water treatment facilities field, concretely relates to oxidation-reduction potential accurate control system for reverse osmosis unit.
Background
The reverse osmosis apparatus (RO) is a device that passes raw water through a fine filter, a granular activated carbon filter, a compressed activated carbon filter, etc., and then is pressurized by a pump, and a reverse osmosis membrane (RO membrane) having a pore size of 1/10000 μm (corresponding to 1/6000 for escherichia coli and 1/300 for viruses) is used to convert water having a relatively high concentration into water having a low concentration, and simultaneously to isolate a large amount of impurities mixed into water, such as industrial pollutants, heavy metals, bacteria, viruses, etc., thereby achieving physicochemical indexes and hygienic standards specified for drinking. The reverse osmosis device can effectively remove charged ions, inorganic matters, colloidal particles, bacteria, organic matters and the like in water by applying a membrane separation technology. Is the best equipment in the processes of preparing high-purity water, desalting brackish water and treating wastewater. The method is widely applied to the fields of electronics, medicine, food, light textile, chemical engineering, power generation and the like.
The oxidation-reduction potential (ORP) is the macroscopic redox that is used to reflect all species in aqueous solution. The higher the redox potential, the stronger the oxidation, and the lower the redox potential, the stronger the reduction. A positive potential indicates that the solution exhibits a certain degree of oxidation, while a negative potential indicates that the solution exhibits a certain degree of reduction.
The water treatment system of the current thermal power plant generally applies a reverse osmosis membrane method (namely, a reverse osmosis system) to pre-desalt and purify to reach the standard, a reverse osmosis device in the reverse osmosis system is a membrane separation device which takes pressure difference as a driving force to separate a solvent from a solution, and oxidation-reduction potential refers to a control index when the reverse osmosis device normally operates.
As the reverse osmosis membrane material is mainly an aromatic polyamide membrane and has poor chlorine resistance, in order to avoid membrane oxidation, a reducing agent is generally considered to be added during design so as to adjust the oxidation-reduction potential in the reverse osmosis device, thereby achieving the purposes of avoiding breeding of organic matters and microorganisms at the inlet of reverse osmosis and preventing oxidation of the reverse osmosis membrane.
However, since the water quality of raw water and the air temperature are changed, it is practically impossible to ensure the ORP control at the inlet of the reverse osmosis apparatus to be within a proper range by simple adjustment, and an oxidation-reduction potential precise control system (device) for the reverse osmosis apparatus having high control accuracy and high efficiency is still lacking.
Based on the circumstances, the utility model provides an oxidation-reduction potential accurate control system for reverse osmosis unit can effectively solve above problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an oxidation-reduction potential accurate control system for reverse osmosis unit. Adopt the utility model discloses an oxidation-reduction potential accurate control system for reverse osmosis unit can be accurately with the ORP control of reverse osmosis unit's import department in suitable scope (like 250 ~ 300 mV) to organic matter, the microorganism of reverse osmosis unit's import department can be avoided breeding, reverse osmosis membrane's oxidation can be prevented again, it is good to ensure reverse osmosis system operating condition.
The utility model discloses a following technical scheme realizes:
an oxidation-reduction potential accurate control system for a reverse osmosis device comprises a sodium hypochlorite metering pump, a first reducing agent metering pump, a second reducing agent metering pump, a first online oxidation-reduction potential tester, a second online oxidation-reduction potential tester and a pump controller, and is used for accurately controlling ORP at an inlet of the reverse osmosis device and ensuring that the reverse osmosis system is excellent in operation condition;
the reverse osmosis system comprises a booster pump, a water purification station, a chemical clean water tank, a multi-medium filter and a reverse osmosis device which are sequentially communicated through pipelines;
the outlet of the booster pump is also communicated with a sodium hypochlorite metering pump;
a first online oxidation-reduction potential tester is arranged at the inlet of the multi-medium filter;
the pipeline between the multi-medium filter and the reverse osmosis device is also communicated with a first reducing agent metering pump and a second reducing agent metering pump;
a second online oxidation-reduction potential tester is arranged at the inlet of the reverse osmosis device;
the sodium hypochlorite metering pump, the first reducing agent metering pump and the second reducing agent metering pump are all electrically connected with a pump controller;
the pump controller is used for respectively controlling the working frequency or the opening degree of the sodium hypochlorite metering pump, the first reducing agent metering pump and the second reducing agent metering pump;
the water purification station is used for pretreating raw water to reduce turbidity, and sending the raw water to a chemical clean water tank for temporary storage after treatment to obtain a low-turbidity solution;
the multi-media filter is used for pre-desalting the low-turbidity solution to obtain a low-salt concentration solution so as to reduce the work load of the reverse osmosis device.
The utility model discloses an oxidation-reduction potential accurate control system for reverse osmosis unit can be accurately with the ORP control of reverse osmosis unit's import department in suitable scope (like 250 ~ 300 mV) to organic matter, the microorganism of reverse osmosis unit's import department can be avoided breeding, reverse osmosis membrane's oxidation can be prevented again, it is good to ensure reverse osmosis system operating condition.
The utility model discloses an add first online oxidation-reduction potential measurement appearance (first ORP table) control water purification station raw water bactericidal effect in multi-media filter's import department, can stably get into the ORP of reverse osmosis unit inner solution simultaneously, increase the stability of reverse osmosis system operation, reduce the change by a wide margin of first reductant measuring pump and second reductant measuring pump dosing to can accurately control the ORP of reverse osmosis unit's import department more easily.
The ORP control of the solution in the reverse osmosis device is too low, the reverse osmosis membrane is easy to generate organic pollution, the ORP control is too high, and the reverse osmosis membrane is easy to oxidize; the utility model discloses a set up the online oxidation-reduction potential measurement appearance of second (second ORP table) real time monitoring in reverse osmosis unit's import department, get into the ORP of reverse osmosis unit inner solution, add the medicine through first reductant measuring pump of pump controller accurate control and second reductant measuring pump, prevent that the reductant from adding the medicine volume too little or too much to avoid reverse osmosis membrane oxidation or contaminated.
Preferably, the pump controller comprises a first adder, a first difference counting circuit and a first PID controller which are electrically connected in sequence, and a second adder, a second difference counting circuit and a second PID controller which are electrically connected in sequence;
the output end of the first PID controller is electrically connected with the sodium hypochlorite metering pump; the input end of the first adder is electrically connected with the first online oxidation-reduction potential tester;
the input end of the second difference counting circuit is also electrically connected with the sound-light alarm circuit and the reverse osmosis device operation control switch respectively; the output end of the second PID controller is electrically connected with the first reducing agent metering pump and the second reducing agent metering pump respectively; and the input end of the second adder is electrically connected with the second online oxidation-reduction potential tester.
Because above structure, the utility model discloses an online redox potential apparatus numerical value of first reductant measuring pump and second can realize the linkage, and then real time control the operating frequency or the aperture of first reductant measuring pump and second reductant measuring pump can prevent more effectively that the reductant from adding the dose too little or too much to avoid reverse osmosis membrane oxidation or contaminated, be automatic control moreover, the cost of using manpower sparingly. In a similar way, the linkage can be realized to the dosage of sodium hypochlorite, better ensure the utility model discloses a reverse osmosis system operates stably. When needed, the reverse osmosis device can also send out an alarm or automatically stop the operation of the reverse osmosis device, thereby better ensuring the safe operation of the reverse osmosis system of the utility model and facilitating the maintenance.
Preferably, the sound and light alarm circuit comprises a buzzer and an LED indicator light.
Preferably, the reverse osmosis system further comprises a residual chlorine on-line analyzer for monitoring the residual chlorine content in the low turbidity solution in the chemical clean water tank in real time.
Residual chlorine on-line analysis appearance real-time supervision residual chlorine content in the low turbidity solution in the chemistry clear water pond, residual chlorine content is the key of avoiding reverse osmosis membrane oxidation or contaminated, the utility model discloses a control through ORP finally realizes residual chlorine content's control to avoid reverse osmosis membrane oxidation or contaminated, the control of ORP is sensitive, accurate, consequently, has guaranteed that reverse osmosis system operation operating condition is good.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model discloses an oxidation-reduction potential accurate control system for reverse osmosis unit can be accurately with the ORP control of reverse osmosis unit's import department in suitable scope (like 250 ~ 300 mV) to organic matter, the microorganism of reverse osmosis unit's import department can be avoided breeding, reverse osmosis membrane's oxidation can be prevented again, it is good to ensure reverse osmosis system operating condition.
The utility model discloses an add first online oxidation-reduction potential measurement appearance (first ORP table) control water purification station raw water bactericidal effect in multi-media filter's import department, can stably get into the ORP of reverse osmosis unit inner solution simultaneously, increase the stability of reverse osmosis system operation, reduce the change by a wide margin of first reductant measuring pump and second reductant measuring pump dosing to can accurately control the ORP of reverse osmosis unit's import department more easily.
The ORP control of the solution in the reverse osmosis device is too low, the reverse osmosis membrane is easy to generate organic pollution, the ORP control is too high, and the reverse osmosis membrane is easy to oxidize; the utility model discloses a set up the online oxidation-reduction potential measurement appearance of second (second ORP table) real time monitoring in reverse osmosis unit's import department, get into the ORP of reverse osmosis unit inner solution, add the medicine through first reductant measuring pump of pump controller accurate control and second reductant measuring pump, prevent that the reductant from adding the medicine volume too little or too much to avoid reverse osmosis membrane oxidation or contaminated.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the reverse osmosis system of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following description of the preferred embodiments of the present invention is given with reference to the accompanying examples, but it should be understood that the drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The utility model discloses in technical characteristics such as sodium hypochlorite measuring pump, first reductant measuring pump, second reductant measuring pump, first online oxidation reduction potential apparatus, the online oxidation reduction potential apparatus of second and pump controller, water purification station, chemical clean water basin, many medium filter and reverse osmosis unit (the utility model discloses a component unit/component), if there is not special explanation, all obtain from conventional commercial approach, or make with conventional method, its concrete structure, theory of operation and the control mode that may involve, spatial arrangement mode adopt the conventional selection in this field can, should not regard as the utility model discloses an innovation point place, to the technical staff in this field, can understand, the utility model discloses a do not further specifically launch the detail.
Example 1:
as shown in fig. 1 to 2, an oxidation-reduction potential precise control system for a reverse osmosis device comprises a sodium hypochlorite metering pump 41, a first reducing agent metering pump 42, a second reducing agent metering pump 43, a first online oxidation-reduction potential measuring instrument 71, a second online oxidation-reduction potential measuring instrument 72 and a pump controller, and is used for precisely controlling ORP at an inlet of the reverse osmosis device and ensuring that the reverse osmosis system has good operation condition; the reverse osmosis system comprises a booster pump 101, a water purification station 102, a chemical clean water tank 103, a multi-media filter 104 and a reverse osmosis device 105 which are sequentially communicated through pipelines; the outlet of the booster pump 101 is also communicated with a sodium hypochlorite metering pump 41; a first online oxidation-reduction potential tester 71 is arranged at the inlet of the multi-medium filter 104; the pipeline between the multimedia filter 104 and the reverse osmosis device 105 is also communicated with the first reducing agent metering pump 42 and the second reducing agent metering pump 43; a second online oxidation-reduction potential tester 72 is arranged at the inlet of the reverse osmosis device 105; the sodium hypochlorite metering pump 41, the first reducing agent metering pump 42 and the second reducing agent metering pump 43 are all electrically connected with a pump controller; the pump controller is used for respectively controlling the working frequency or the opening degree of the sodium hypochlorite metering pump 41, the first reducing agent metering pump 42 and the second reducing agent metering pump 43; the water purifying station 102 is used for pretreating raw water to reduce turbidity, and sending the raw water to the chemical clean water tank 103 for temporary storage after treatment to obtain a low-turbidity solution; the multi-media filter 104 is used for pre-desalting the low turbidity solution to obtain a low salt concentration solution, so as to reduce the work load of the reverse osmosis device 105.
Example 2:
as shown in fig. 1 to 2, an oxidation-reduction potential precise control system for a reverse osmosis device comprises a sodium hypochlorite metering pump 41, a first reducing agent metering pump 42, a second reducing agent metering pump 43, a first online oxidation-reduction potential measuring instrument 71, a second online oxidation-reduction potential measuring instrument 72 and a pump controller, and is used for precisely controlling ORP at an inlet of the reverse osmosis device and ensuring that the reverse osmosis system has good operation condition;
the reverse osmosis system comprises a booster pump 101, a water purification station 102, a chemical clean water tank 103, a multi-media filter 104 and a reverse osmosis device 105 which are sequentially communicated through pipelines;
the outlet of the booster pump 101 is also communicated with a sodium hypochlorite metering pump 41;
a first online oxidation-reduction potential tester 71 is arranged at the inlet of the multi-medium filter 104;
the pipeline between the multimedia filter 104 and the reverse osmosis device 105 is also communicated with the first reducing agent metering pump 42 and the second reducing agent metering pump 43;
a second online oxidation-reduction potential tester 72 is arranged at the inlet of the reverse osmosis device 105;
the sodium hypochlorite metering pump 41, the first reducing agent metering pump 42 and the second reducing agent metering pump 43 are all electrically connected with a pump controller;
the pump controller is used for respectively controlling the working frequency or the opening degree of the sodium hypochlorite metering pump 41, the first reducing agent metering pump 42 and the second reducing agent metering pump 43;
the pump controller herein may be one commonly used in the art. In practical applications, a person skilled in the art can control (including manually controlling and automatically controlling) the operating frequencies or the opening degrees of the sodium hypochlorite metering pump 41, the first reducing agent metering pump 42 and the second reducing agent metering pump 43 respectively by a pump controller according to the real-time readings of the first online oxidation-reduction potential measuring instrument 71 and the second online oxidation-reduction potential measuring instrument 72, so as to control the ORP of the positions of the first online oxidation-reduction potential measuring instrument 71 and the second online oxidation-reduction potential measuring instrument 72 within a desired range.
The water purifying station 102 is used for pretreating raw water to reduce turbidity, and sending the raw water to the chemical clean water tank 103 for temporary storage after treatment to obtain a low-turbidity solution;
the multi-media filter 104 is used for pre-desalting the low turbidity solution to obtain a low salt concentration solution, so as to reduce the work load of the reverse osmosis device 105.
Further, in another embodiment, the pump controller includes a first adder 11, a first difference count circuit 21, and a first PID controller 31 electrically connected in this order, and a second adder 12, a second difference count circuit 22, and a second PID controller 32 electrically connected in this order;
the output end of the first PID controller 31 is electrically connected with the sodium hypochlorite metering pump 41; the input end of the first adder 11 is electrically connected with the first online oxidation-reduction potential tester 71;
the input end of the second difference counting circuit 22 is also electrically connected with the sound-light alarm circuit 5 and the reverse osmosis device operation control switch 6 respectively; the output end of the second PID controller 32 is electrically connected to the first reducing agent metering pump 42 and the second reducing agent metering pump 43 respectively; the input of the second adder 11 is electrically connected to the second online oxidation-reduction potential meter 72.
When in use, the second adder 12 outputs ORP deviation amount according to the second online oxidation-reduction potential measuring instrument (72) and the input second ORP set value, the second difference counting circuit 22 outputs ORP control amount according to ORP deviation amount, and judges the range of ORP control amount and correspondingly outputs the ORP control amount to the acousto-optic alarm circuit 5, the reverse osmosis device operation control switch 6 or the second PID controller 32, for example, when in a certain range, the second PID controller 32 outputs execution amount according to control amount to control the frequency or opening degree of the first reducing agent metering pump 42 and the second reducing agent metering pump 43, so as to realize linkage; when the temperature is smaller than a certain reasonable range, the second PID controller 32 controls the first reducing agent metering pump 42 and the second reducing agent metering pump 43 to stop working, and the sound-light alarm circuit 5 gives an alarm; when the quantity of the reducing agent reaches a certain range again, restarting and continuing the linkage work (in practical application, a buffer container can be added on a pipeline in the area when necessary to provide a larger space requirement for adjusting ORP).
Further, in another embodiment, the audible and visual alarm circuit 5 comprises a buzzer and an LED indicator light.
Further, in another embodiment, the reverse osmosis system further comprises an on-line residual chlorine analyzer 73 for monitoring the residual chlorine content in the low turbidity solution in the chemical clean water tank 103 in real time.
According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the oxidation-reduction potential precise control system for reverse osmosis device of the present invention, and can produce the positive effects described in the present invention.
Unless otherwise specified, in the present invention, if the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are used for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass both fixed and removable connections, or integral connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (4)
1. The utility model provides an oxidation-reduction potential accurate control system for reverse osmosis unit which characterized in that: the device comprises a sodium hypochlorite metering pump (41), a first reducing agent metering pump (42), a second reducing agent metering pump (43), a first online oxidation-reduction potential tester (71), a second online oxidation-reduction potential tester (72) and a pump controller, and is used for accurately controlling ORP at the inlet of the reverse osmosis device and ensuring that the reverse osmosis system has excellent operation condition;
the reverse osmosis system comprises a booster pump (101), a water purification station (102), a chemical clean water tank (103), a multi-medium filter (104) and a reverse osmosis device (105) which are sequentially communicated through pipelines;
the outlet of the booster pump (101) is also communicated with a sodium hypochlorite metering pump (41);
a first online oxidation-reduction potential tester (71) is arranged at the inlet of the multi-medium filter (104);
the pipeline between the multi-medium filter (104) and the reverse osmosis device (105) is also communicated with a first reducing agent metering pump (42) and a second reducing agent metering pump (43);
a second online oxidation-reduction potential tester (72) is arranged at the inlet of the reverse osmosis device (105);
the sodium hypochlorite metering pump (41), the first reducing agent metering pump (42) and the second reducing agent metering pump (43) are electrically connected with a pump controller;
the pump controller is used for respectively controlling the working frequency or the opening degree of the sodium hypochlorite metering pump (41), the first reducing agent metering pump (42) and the second reducing agent metering pump (43);
the water purification station (102) is used for pretreating raw water to reduce turbidity, and sending the raw water to a chemical clean water tank (103) for temporary storage after treatment to obtain a low-turbidity solution;
the multi-media filter (104) is used for pre-desalting the low-turbidity solution to obtain a low-salt concentration solution so as to reduce the work load of the reverse osmosis device (105).
2. The system for precise control of oxidation-reduction potential for reverse osmosis unit of claim 1, wherein: the pump controller comprises a first adder (11), a first difference counting circuit (21) and a first PID controller (31) which are electrically connected in sequence, and a second adder (12), a second difference counting circuit (22) and a second PID controller (32) which are electrically connected in sequence;
the output end of the first PID controller (31) is electrically connected with the sodium hypochlorite metering pump (41); the input end of the first adder (11) is electrically connected with the first online oxidation-reduction potential tester (71);
the input end of the second difference counting circuit (22) is also electrically connected with the acousto-optic alarm circuit (5) and the reverse osmosis device operation control switch (6) respectively; the output end of the second PID controller (32) is electrically connected with the first reducing agent metering pump (42) and the second reducing agent metering pump (43) respectively; the input end of the second adder (11) is electrically connected with the second online oxidation-reduction potential tester (72).
3. The system for precise control of oxidation-reduction potential for reverse osmosis unit of claim 1, wherein: the sound and light alarm circuit (5) comprises a buzzer and an LED indicator light.
4. The system for precise control of oxidation-reduction potential for reverse osmosis unit of claim 1, wherein: the reverse osmosis system also comprises a residual chlorine on-line analyzer (73) for monitoring the residual chlorine content in the low turbidity solution in the chemical clean water tank (103) in real time.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113213613A (en) * | 2021-05-19 | 2021-08-06 | 上海波赛统环境科技有限公司 | Method for controlling dosage of ammonia nitrogen wastewater chlorination and oxidation agent |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113213613A (en) * | 2021-05-19 | 2021-08-06 | 上海波赛统环境科技有限公司 | Method for controlling dosage of ammonia nitrogen wastewater chlorination and oxidation agent |
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