CN103466836B - The control method of caustic dosage in a kind of water-purifying apparatus - Google Patents
The control method of caustic dosage in a kind of water-purifying apparatus Download PDFInfo
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- CN103466836B CN103466836B CN201310422427.6A CN201310422427A CN103466836B CN 103466836 B CN103466836 B CN 103466836B CN 201310422427 A CN201310422427 A CN 201310422427A CN 103466836 B CN103466836 B CN 103466836B
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- Prior art keywords
- water
- alkaline matter
- injection device
- pipeline
- conductivity
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Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000003518 caustics Substances 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000007670 refining Methods 0.000 claims abstract description 15
- 239000003513 alkali Substances 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000001223 reverse osmosis Methods 0.000 description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The control method of caustic dosage in a kind of water-purifying apparatus, be included in the process of carrying out adding alkaline matter in the pipeline between one-level RO refining plant and secondary RO refining plant by alkaline matter injection device, key is: described control method sets up conductivity sensor in pipeline, electrical conductivity of water in the real time measure pipeline in the process adding alkaline matter, then according to the numerical range of specific conductivity and then the start and stop of control alkaline matter injection device.The invention has the beneficial effects as follows, by conductivity sensor the real time measure electrical conductivity of water, and export measurement result to central processing unit, central processing unit can control the switch of alkaline matter injection device fast, to ensure the pH value of water in the preferred range, compare traditional method real-time good, testing method is simple, and cost is low, easy handling, fully automated controls, and reduces the difficulty adding alkali and control, and improves the control accuracy of finished product water pH value greatly.
Description
Technical field
The present invention relates to a kind of twin-stage RO water-purifying apparatus and add alkali control method, particularly a kind of method being replaced mensuration water pH value control caustic dosage by specific conductivity.
Background technology
Because first-stage reverse osmosis (RO) water inlet is containing CO
2, so one-level RO product water pH value is general all low than water inlet, as influent alkalinity and HCO
3-during content height, its pH value declines larger.When pH is less than 8, HCO in water
3-, CO
3 2-start to transfer CO to
2, when pH is less than 4, HCO in water
3-, CO
3 2-all transfer CO to
2.Therefore, in secondary RO is intake, CO can be made by adding NaOH
2-transfer the HCO that can be removed by RO film to
3-, CO
3 2-, thus improve the ratio of desalinization of secondary RO.Secondary RO water inlet pH value controls about 8.3, can obtain best secondary and produce water water quality.But existing refining plant adds alkali to be controlled inconvenient, complicated operation, and precision is lower, affects the water quality that secondary produces water.
Summary of the invention
The present invention adds alkali control inconvenience, the problems such as complicated operation to solve water-purifying apparatus in the past, and devise a kind of by conductance measurement water pH value, full automatic control adds the method for alkali.
The technical solution used in the present invention is, the control method of caustic dosage in a kind of water-purifying apparatus, be included in the process of carrying out adding alkaline matter in the pipeline between one-level RO refining plant and secondary RO refining plant by alkaline matter injection device, key is: described control method sets up conductivity sensor in pipeline, electrical conductivity of water in the real time measure pipeline in the process adding alkaline matter, then according to the numerical range of specific conductivity and then the start and stop of control alkaline matter injection device.
Described control method realizes by central processing unit, and the output terminal of conductivity sensor is connected with central processing unit, exports the start and stop that control signal controls alkaline matter injection device after central processing unit process.
Specific works principle of the present invention is: add alkaline matter by alkaline matter injection device in the pipeline between one-level RO refining plant and secondary RO refining plant, conductivity sensor is installed simultaneously in pipeline and measures electrical conductivity of water, and export measurement result to central processing unit, water conductivity value and pH value corresponding relation is with this understanding produced according to one-level RO, central processing unit controls the Kai Heguan of alkaline matter injection device according to electrical conductivity of water, when specific conductivity is 70 ~ 80 μ S/m, the pH value of water is between 7.5 ~ 8.5, when specific conductivity is less than 70 μ S/m, open alkaline matter injection device and add alkali, when specific conductivity is greater than 80 μ S/m, then close alkaline matter injection device, stop adding alkali.
The invention has the beneficial effects as follows, by cheap, stable conductivity sensor the real time measure electrical conductivity of water, and export measurement result to central processing unit, central processing unit can control the switch of alkaline matter injection device fast, to ensure the pH value of water in the preferred range, compare traditional method real-time good, safeguard simple, testing method is simple, cost is low, easy handling, and fully automated controls, reduce the difficulty adding alkali and control, and improve the control accuracy of finished product water pH value greatly.
Accompanying drawing explanation
Fig. 1 is the system architecture embodiment schematic diagram of method application in the present invention.
1 represents one-level RO refining plant, and 2 represent secondary RO refining plant, and 3 represent alkaline matter injection device, and 4 represent conductivity sensor, and 5 represent central processing unit.
Embodiment
The control method of caustic dosage in a kind of water-purifying apparatus, be included in the process of carrying out adding alkaline matter in the pipeline between one-level RO refining plant 1 and secondary RO refining plant 2 by alkaline matter injection device 3, key is: described control method is in pipeline, set up conductivity sensor 4, electrical conductivity of water in the real time measure pipeline in the process adding alkaline matter, then according to the numerical range of specific conductivity and then the start and stop of control alkaline matter injection device 3.
Described control method realizes by central processing unit 5, and the output terminal of conductivity sensor 4 is connected with central processing unit 5, and central processing unit 5 processes the start and stop that rear output control signal controls alkaline matter injection device 3.
The present invention in the specific implementation, alkaline matter is added by alkaline matter injection device 3 in pipeline between one-level RO refining plant 1 and secondary RO refining plant 2, in pipeline, install conductivity sensor 4 measures electrical conductivity of water simultaneously, and export measurement result to central processing unit 5, central processing unit 5 controls the Kai Heguan of alkaline matter injection device 3 according to electrical conductivity of water, when specific conductivity is 70 ~ 80 μ S/m, the pH value of water is between 7.5 ~ 8.5, when specific conductivity is less than 70 μ S/m, open alkaline matter injection device 3 to carry out adding alkali, when specific conductivity is greater than 80 μ S/m, then close alkaline matter injection device 3, stop adding alkali.Present method can effectively ensure the pH value of water in the preferred range, compares traditional method real-time good, safeguards simple, testing method is simple, and cost is low, easy handling, fully automated controls, and reduces the difficulty adding alkali and control, and improves the control accuracy of finished product water pH value greatly.
Claims (2)
1. the control method of caustic dosage in a water-purifying apparatus, be included in the process of carrying out adding alkaline matter in the pipeline between one-level RO refining plant (1) and secondary RO refining plant (2) by alkaline matter injection device (3), it is characterized in that: described control method is in pipeline, set up conductivity sensor (4), electrical conductivity of water in the real time measure pipeline in the process adding alkaline matter, then according to the numerical range of specific conductivity and then the start and stop of control alkaline matter injection device (3)
When specific conductivity is less than 70 μ S/m, opens alkaline matter injection device (3) and carry out adding alkali, when specific conductivity is greater than 80 μ S/m, then close alkaline matter injection device (3).
2. the control method of caustic dosage in a kind of water-purifying apparatus according to claim 1, it is characterized in that: described control method realizes by central processing unit (5), the output terminal of conductivity sensor (4) is connected with central processing unit (5), exports the start and stop that control signal controls alkaline matter injection device (3) after central processing unit (5) process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310422427.6A CN103466836B (en) | 2013-09-16 | 2013-09-16 | The control method of caustic dosage in a kind of water-purifying apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310422427.6A CN103466836B (en) | 2013-09-16 | 2013-09-16 | The control method of caustic dosage in a kind of water-purifying apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103466836A CN103466836A (en) | 2013-12-25 |
| CN103466836B true CN103466836B (en) | 2015-08-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310422427.6A Expired - Fee Related CN103466836B (en) | 2013-09-16 | 2013-09-16 | The control method of caustic dosage in a kind of water-purifying apparatus |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649473B (en) * | 2015-01-08 | 2016-05-04 | 上海城市水资源开发利用国家工程中心有限公司 | In the former water treatment procedure of a kind of high pH, control the Apparatus and method for of residual Al concentration |
| CN107032518A (en) * | 2017-04-14 | 2017-08-11 | 西安热工研究院有限公司 | A kind of system and method for controlling two-pass reverse osmosis producing water water quality |
| CN108983728B (en) * | 2018-08-10 | 2021-04-30 | 青海盐湖工业股份有限公司 | System for realizing automatic control of lithium washing process by using conductivity meter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201704105U (en) * | 2010-02-01 | 2011-01-12 | 无锡市双净净化设备有限公司 | Device for adding NaOH solution before one-stage reverse osmosis water supply |
-
2013
- 2013-09-16 CN CN201310422427.6A patent/CN103466836B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201704105U (en) * | 2010-02-01 | 2011-01-12 | 无锡市双净净化设备有限公司 | Device for adding NaOH solution before one-stage reverse osmosis water supply |
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| CN103466836A (en) | 2013-12-25 |
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