CN1188698C - Device and method of measuring PH value - Google Patents
Device and method of measuring PH value Download PDFInfo
- Publication number
- CN1188698C CN1188698C CNB021445389A CN02144538A CN1188698C CN 1188698 C CN1188698 C CN 1188698C CN B021445389 A CNB021445389 A CN B021445389A CN 02144538 A CN02144538 A CN 02144538A CN 1188698 C CN1188698 C CN 1188698C
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- Prior art keywords
- value
- fluid
- electrode
- pump
- measurement
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- Expired - Lifetime
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000012530 fluid Substances 0.000 claims abstract description 54
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 2
- 210000002966 serum Anatomy 0.000 abstract 2
- 239000002002 slurry Substances 0.000 description 23
- 238000006386 neutralization reaction Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 210000000795 conjunctiva Anatomy 0.000 description 9
- 239000003292 glue Substances 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 239000012266 salt solution Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004517 catalytic hydrocracking Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The present invention discloses a device and a method for the continuous online measurement of a pH value. The device comprises a container for containing a fluid with the pH value to be measured, and a feeding hole and a discharging hole are respectively arranged on the upper part and the lower part of the container; a pump is arranged on the pipeline at the discharging hole, and a fluid slot used for inserting a pH electrode is arranged between the inlets of the pump and the container; and the fluid slot used for inserting a pH electrode is preferably a pH electrode sheath. The present invention has the method that the pump is used for conveying the fluid to be measured to the fluid slot for inserting a pH electrode so as to form an external circulation loop of the fluid, and the continuous online detection of the pH value of the fluid is realized. Compared with the prior art, the device and the method can realize the continuous online measurement of the pH value of the fluid. A preferable scheme for the present invention is particularly used for measuring serum apt to cause the sensitive film of the pH electrode to form a film so as to ensure that the pH electrode does not drift any more, and the continuous online measurement of the pH value of the serum can be realized. The device is suitable for the continuous online measurement of the pH value of the fluid.
Description
Technical field
The present invention relates to a kind of measurement mechanism and method, more particularly, relate to a kind of relevant device and method of measuring fluid pH value.
Background technology
In a lot of chemical engineering processes, need to measure the pH value of fluid, to characterize the size of acid concentration in the fluid, control is reflected under certain pH value to be carried out.Usually, it is synthetic that the carrier of hydrocracking, Hydrobon catalyst mostly adopts into the preparation of glue method, becoming the glue legal system to be equipped with in the process of catalyst support, adopting aluminum salt solution (or acid solution) and aqueous slkali (or alkaline metal acid salt solution) is base stock, carries out neutralization reaction and forms slurries.The pH value of slurries has direct influence to the character of carrier, is into one of important technical parameters in the glue process.At present, when measuring slurry pH value, the conjunctiva phenomenon easily takes place in its electrode sensitive film in slurries, along with the increase of conjunctiva thickness, cause the continuous drift of pH value.The pH electrode approximately uses after 10 minutes and just can not detect, and must clean, through demarcating again and could using.Can not satisfy into the requirement of adhesive process the service time of electrode like this.Therefore, be prolongation electrode service time in actual use, have to adopt the batch (-type) measuring method.Common way is, every interval a few minutes put into slurries with electrode and measure once in preparation process, take out electrode then from slurries, and repeatedly repeat this process until cemented into bundles.
Above-mentioned step measuring method, though can prolong the service time of pH electrode, electrode can use cemented into bundles, but exist following point: at first, when becoming glue to begin, raw material enters in the neutralization tank, and slurry pH value fluctuates widely, the moving variable valve of armrest is controlled acid, aqueous slkali flow, needs the long time (about five minutes) could be with the pH value stabilization of slurries in the scope that requires.Secondly, the pH value that the time in each measures at interval can't guarantee slurries in claimed range, thereby have influence on the quality for preparing carrier.And owing to adopt batch process can not be embodied as the automatic control of glue process.Therefore, the operating personnel that need the long-term work experience in actual production just can produce specification product, often because human factor becomes the process data repeatability of glue process bad.In addition this method activity duration long, labour intensity is big, operating conditions is unfriendly.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of on-line continuous to measure the measurement mechanism and the method for fluid pH value.When easily making the slurries of pH electrode sensitive film conjunctiva, its conjunctiva thickness is remained unchanged, guarantee that the pH electrode no longer drifts about, thereby realize the measurement of slurry pH value on-line continuous especially for mensuration.
For achieving the above object, pH value measurement mechanism of the present invention, a charging aperture and a discharging opening have been set up respectively in the container upper and lower of splendid attire pH value to be measured fluid, a pump is set on the pipeline at discharging opening place, between charging aperture and discharging opening, just form a fluid outer circulation loop by pump and pipeline like this, realized the outer circulation of this container inner fluid.And between pump and container import, a fluid slot that is used to assign the pH electrode is set, comes the pH value of test fluid.With pump with FLUID TRANSPORTATION to be measured to the fluid slot that is used for assigning the pH electrode, after on the fluid impact pH electrode sensitive film, flow out the fluid slot that is used to assign the pH electrode then, enter and be back to splendid attire in the pipeline and treat in the container of fluid measured, finish once circulation, thereby the on-line continuous that has realized fluid pH value is measured.
For realizing purpose of the present invention, pH value measurement method of the present invention is: with the container inner fluid of pump with splendid attire pH value to be measured fluid, carry and assign in the fluid slot of pH electrode, form a fluid outer circulation loop, to realize the pH value of online continuous detecting fluid.
Compared with prior art, the present invention has following advantage: the method that adopts the fluid outer circulation, because the flow of external circulating system is big and pipeline length is shorter, it is consistent assigning the pH value of pH value and pH value fluid to be measured of the fluid slot inner fluid of pH electrode, can realize the continuous on-line measurement of fluid pH value.
Description of drawings
Fig. 1 is the schematic flow sheet that the slurry pH value method was measured and controlled to on-line continuous.
Fig. 2 is the longitudinal profile structural map of pH value electrode sheath.
1. acid solution basins among the figure, 2. alkali lye basin, 3. pump, 4. pump, 5. neutralization tank, 6. discharging opening, 7. pump, 8.pH electrode sheath, 9. charging aperture, 10. sheath inlet, 11. electrode sensitive films, 12. toroidal cavities, 13. nozzles, 14.pH electrode, the outlet of 15. sheaths.
Embodiment
PH value measurement mechanism of the present invention, between the container import of pump and splendid attire pH value to be measured fluid, a pH electrode sheath that is used to assign the pH electrode preferably is set, described pH electrode sheath is as shown in Figure 2, the cylindrical fluid groove that this pH electrode sheath is a hollow has three openings on it.PH electrode 14 inserts from upper opening, and upper opening and pH electrode adopt thread connection, use soft packing seal.The fluid slot lower openings is a sheath inlet 10, and feed pipe adopts welding or thread connection and fluid slot to link together.The opening of the side of fluid slot is sheath outlet 15, and discharge nozzle adopts welding or thread connection and fluid slot to link together.Sheath inlet 10 and sheath export 15 at an angle, and angle as shown in Figure 2 is 90 °.Sheath 10 places that enter the mouth are provided with nozzle 13.
Below in conjunction with accompanying drawing the present invention is described in further detail.
As shown in Figure 1, adopting aluminum salt solution and aqueous slkali is base stock, become the glue legal system to be equipped with catalyst carrier for hydrgenating, before neutralization tank 5 injects raw material, in neutralization tank 5, add an amount of water bottom in advance, realize that by pump 7 material in the neutralization tanks 5 is from discharging opening 6, through the fluid outer circulation of pH electrode sheath 8 to charging aperture 9.Solution in acid solution basin 1 and the alkali lye basin 2 is transported to neutralization tank 5 beginning neutralization reactions by pump 3 and pump 4 respectively.Because the flow of external circulating system is big and pipeline length is shorter, the pH value of slurries is consistent in the pH value of the slurries in the pH electrode sheath 8 and the neutralization tank 5.As shown in Figure 2, slurries enter the pH electrode sheath 8 from sheath inlet 10, on the high speed impact electrode sensitive film 11 after, the annular cavity 12 that forms through pH electrode 14 and pH electrode sheath 8, flow out pH electrode sheaths 8 from sheath outlet 15 and enter and be back to neutralization tank 5 pipeline, finish once circulation.10 places are provided with nozzle 13 because sheath enters the mouth, and the bore of nozzle 13 is between 1～20mm, and preferred version is between 3～8mm, can make slurries accelerate to certain speed (2～10 meter per second).Should keep certain clearance between nozzle 13 outlets and the electrode sensitive film 11, its scope is between 1～20mm, and preferred version makes electrode sensitive film 11 be subjected to certain souring between 2～8mm, is unlikely to excessive wear again.When using new electrode measurement, occur conjunctiva on the starting stage electrode sensitive film 11 and constantly thicken.Wash away down in the high speed of slurries, after about 30 minutes, its conjunctiva no longer thickens, and its thickness keeps constant in the use afterwards, makes pH electrode 14 no longer be subjected to the influence of conjunctiva variation in thickness and drift has realized the measurement of the on-line continuous of slurries.
Real-time, the continuous situation of change of slurry pH value that arrives according to the pH electrode detection, come respectively the flow and the switch of control acid solution, alkali lye volume pump 3, pump 4 automatically by computer control system, make the pH value of slurries reach ± 0.2 accuracy requirement, satisfy the needs that become adhesive process, produced the catalyst support of expection.Method and apparatus of the present invention compared with prior art, it is reliable to have smooth operation, human intervention is few, the data precision height, the characteristics of good reproducibility have realized the glue legal system to be equipped with the microcomputer automatic control of the pH value of slurries in the catalyst support process; Simultaneously also simplify operation, shortened the activity duration, improved work situation greatly.
Compared with prior art, adopt preferred version of the present invention, when being used to measure the slurries that easily make pH electrode sensitive film conjunctiva, the detected fluid flow velocity improves greatly, fluid high-speed washes away the electrode sensitive film, its conjunctiva thickness is remained unchanged, guaranteed that the pH electrode no longer drifts about, can realize the measurement of slurry pH value on-line continuous.
Claims (8)
1, a kind of device of measuring the pH value, it is characterized in that it comprises the container of a splendid attire pH value to be measured fluid, a charging aperture and a discharging opening are set respectively in the upper and lower of described container, a pump is set on the pipeline at discharging opening place, between charging aperture and discharging opening, form a fluid outer circulation loop by pump and pipeline, between the pump and container charging aperture in described outer circulation loop, a fluid slot that is used to assign the pH electrode is set.
2, the device of measurement pH value according to claim 1, it is characterized in that being used to assign the fluid slot of pH electrode is the pH electrode sheath.
3, the device of measurement pH value according to claim 2, it is characterized in that described pH electrode sheath is the fluid slot of a hollow, have three openings on it, pH electrode [14] inserts from upper opening, the opening of fluid slot bottom is a sheath inlet [10], the opening of the side of fluid slot is sheath outlet [15], and sheath inlet [10] locates to be provided with nozzle [13].
4, the device of measurement pH value according to claim 3, the bore that it is characterized in that described nozzle [13] is between 1～20mm.
5, the device of measurement pH value according to claim 3, the bore that it is characterized in that described nozzle [13] is between 3～8mm.
6, the device of measurement according to claim 3 pH value, it is characterized in that described nozzle [13] exports and electrode sensitive film [11] between distance between 1～20mm.
7, the device of measurement according to claim 3 pH value, it is characterized in that described nozzle [13] exports and electrode sensitive film [11] between distance between 2～8mm.
8, a kind of method of measuring the pH value is characterized in that using the device of the described measurement of claim 1 pH value, and with the container inner fluid of pump with splendid attire pH value to be measured fluid, conveying is assigned in the fluid slot of pH electrode, forms a fluid outer circulation loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021445389A CN1188698C (en) | 2002-11-02 | 2002-11-02 | Device and method of measuring PH value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021445389A CN1188698C (en) | 2002-11-02 | 2002-11-02 | Device and method of measuring PH value |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1493873A CN1493873A (en) | 2004-05-05 |
| CN1188698C true CN1188698C (en) | 2005-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021445389A Expired - Lifetime CN1188698C (en) | 2002-11-02 | 2002-11-02 | Device and method of measuring PH value |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1188698C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7883898B2 (en) * | 2007-05-07 | 2011-02-08 | General Electric Company | Method and apparatus for measuring pH of low alkalinity solutions |
| CN101419187B (en) * | 2008-04-08 | 2012-06-27 | 北京矿冶研究总院 | Online pulp pH meter |
| CN106290497A (en) * | 2016-08-05 | 2017-01-04 | 苏州天键衡电子信息科技有限公司 | A kind of acid-base value efficient detection device |
| CN108950590A (en) * | 2018-07-11 | 2018-12-07 | 青海盐湖工业股份有限公司 | A kind of system and method for primary brine quality in control chlor-alkali production |
| CN112569883B (en) * | 2020-11-04 | 2022-07-22 | 阮氏化工（常熟）有限公司 | Online adjusting and controlling system and method for acid liquor and alkali liquor mixed pH value |
| CN115684301A (en) * | 2022-09-29 | 2023-02-03 | 中国恩菲工程技术有限公司 | Slurry pH value adjusting and detecting device and slurry processing device |
-
2002
- 2002-11-02 CN CNB021445389A patent/CN1188698C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1493873A (en) | 2004-05-05 |
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| SE01 | Entry into force of request for substantive examination | ||
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Granted publication date: 20050209 |