CN201096740Y - Plasm PH value measuring device - Google Patents
Plasm PH value measuring device Download PDFInfo
- Publication number
- CN201096740Y CN201096740Y CNU2007201757230U CN200720175723U CN201096740Y CN 201096740 Y CN201096740 Y CN 201096740Y CN U2007201757230 U CNU2007201757230 U CN U2007201757230U CN 200720175723 U CN200720175723 U CN 200720175723U CN 201096740 Y CN201096740 Y CN 201096740Y
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Abstract
The utility model relates to a measuring device for measuring the PH value of slurry, comprising measuring electrodes. A measuring bypass is arranged at a slurry discharging pipeline; a measuring bracket and a flow adjusting valve are arranged on the measuring bypass; the measuring bracket is a diameter-varying three-way tube whose inlet is shorter in diameter and whose central part is longer in diameter; the inlet of the three-way tube is arranged at the lower end of the measuring bracket; the gravity-flow outlet of the measuring bracket is arranged on the side wall near the upper end of the measuring bracket; the measuring electrodes are extended into the measuring bracket tube from the upper end of the measuring bracket and are mounted at the upper end of the measuring bracket through a fixing device. The measuring device for measuring the PH value of slurry is simple in structure and accurate in measurement; besides, the measuring electrodes are convenient in disassembly.
Description
Technical field
The utility model relates to a kind of slurries pH value measurement mechanism of in flue gas desulfurization course the pH value of absorption tower slurries being measured.
Background technology
Along with country to SO in the fuel-burning power plant
2The strictness control of discharging, each power plant all needs to take appropriate measures to reduce discharging.This technology that wherein adopts wet fuel gas desulfurizing technology that flue gas is purified is ripe and the most feasible present scheme.In wet fuel gas desulfurizing technology, need that all the absorption tower slurry medium is carried out continuous PH and measure at present.(the slurries volume is at 500 ~ 3000m usually because the absorption tower is bigger
3, and complicated slurries spray and recycle are arranged, directly in the absorption tower, measure and can't realize.All adopt at present at the absorption tower of operation continuously slurries extraction pipelines (absorption tower slurries extraction pump pipeline, absorption tower ebullator pipeline) and upward measure.In order to reduce the cost of measuring pipeline and to avoid instrument fault to influence system's operation, adopt a bypass line usually, the PH meter is installed on the pipeline measures.
PH value must be measured two kinds of methods at present: immersion, flow type.Immersion requires electrode fully to be immersed in the measured medium; Flow type is directly potential electrode to be installed in (, the common middle part that electrode directly be inserted into pipeline representative for guaranteeing the measured position slurries) on the mobile pipeline of measured medium.
The electrode of immersion is measured in non-pressure vessel or low pressure vessel (pressure medium is lower than 0.2MPa) usually, and the electrode protection shell adopts plastic material, low price.The electrode of flow type uses usually at the higher environment of pressure (pressure medium is between 0.2～1MPa), and the electrode protection shell adopts metal or special material.The electrode of immersion requires the relative velocity of measured medium motion could guarantee the accuracy of measurement data like this less than 0.4m/s usually.
From measuring principle, adopt the electrode of flow type more reasonable.But its in actual applications the electrode of flow type face following difficulty:
A. owing to be directly installed on process pipeline or the bypass measurement pipeline, its pressure is determined by technological requirement, usually all between 0.4～0.6MPa.The electrode of selecting for use in the case just needs to adopt metal protection protector.Because the wet desulfurizing process medium is in weakly acidic environment (PH is between 4～6) all, and the CL-content in the medium higher (being lower than 20000ppm).Common with this understanding stainless steel will soon corrode, and therefore requires to adopt senior stainless steel or alloy steel, and electrode costs an arm and a leg.
B. electrode cleans difficulty.Because contain gypsum and calcium sulfite in the wet desulphurization absorption tower slurries, its adhesiveness is stronger.Electrode has the part medium and adheres on it after using a period of time on its electrode, measurement is had bigger influence.Usually adopt water, chemical, ultrasound wave to clean.But because pressure medium is higher, adopting clean-out system to clean (water, chemical) all needs cleansing medium that higher pressure (to ultrasonic cleaning, also needing the electrode after cleaning is adopted the water flushing) is arranged.But usually the rinse water pressure of process system lower (0.4～0.6MPa), can't satisfy electrode and clean, need set up extra flushing water source, increased cost.
C. the electrode marked ratio is difficult.Because the PH electrode adopts redox measuring principle, the electric signal of PH electrode measurement can change along with the variation of contrast electrode medium.In use for some time, must demarcate (answer the drift that occurs in the use to revise to it, revise the measurement correlation curve in the souvenir) again to it.After timing signal need clean up electrode, be immersed in the standard solution (contrast medium), to its measured value and linear the correction, this demarcation must be carried out once usually in per two weeks, otherwise can't guarantee its service precision again.The installation pipeline pressure medium of flow type electrode is higher, usually adopt bolt, dismounting complicated (external PH meter by special online replaceable electrode can be implemented in pressure piping and dismantles eaily, but it needs special electrode and separation valve door, and price is tens times of ordinary electrode).
D. because desulfurization slurry one side solids content than higher (between 10%～30%), causes part slurries gradually to precipitate at pipe interior owing to flow velocity reduces in order to prevent medium, the flow velocity of pipeline is usually at 1.5～3m/s.In so fast flow media, the PH electrode measurement is inaccurate easily.
The immersion electrode also faces following difficulty:
A. pressure medium height, the simple glass electrode can't satisfy request for utilization (it can not bear the pressure of actuating medium), needs to adopt expensive metal protection protector, can't give prominence to the cheap advantage of its electrode.
B. electrode cleans difficulty (reason is with the electrode of flow type).
C. the electrode marked ratio the difficulty (reason is with the electrode of flow type).
D. the measurement that causes of high flow rate is inaccurate more serious than flow type.
The utility model content
The purpose of this utility model is at the problems referred to above, provides a kind of simple in structure, measures slurries pH value measurement mechanism accurate, the potential electrode convenient disassembly.
For achieving the above object, the utility model adopts following technical scheme:
A kind of slurries pH value measurement mechanism, comprise potential electrode, it is characterized in that: be provided with one at the slurries discharge line and measure bypass, in the measurement bypass, be provided with measurement bracket and flow control valve, described measurement bracket is the reducing tee pipe fitting that inlet diameter is little, mid diameter is big, described inlet is located at the lower end of measurement bracket, measurement bracket is located near on the sidewall of upper end from flow export, and described potential electrode stretches in the measurement bracket pipe from the measurement bracket upper end, and is installed in the measurement bracket upper end by stationary installation.
Described potential electrode is the immersion glass electrode.
Owing to the special measurement pipeline is set,, makes it in measuring the chamber, produce one and be the measurement environment of normal pressure (atmospheric pressure) by the step-down of reducing to actuating medium; Simultaneously owing to guarantee to measure the medium continuous flow of pipeline, make the representational medium of measurement that it can be continuous.By above-mentioned means, can be with the former measuring method that need on pressure duct, adopt the flow type electrode, flexible to adopting the immersion electrode under normal pressure, to measure, realize that like this substituting expensive high-field electrode with cheap potential electrode carries out the on-line continuous measurement to the gypsum slurries pH value of wet desulfurization system, it is simple in structure, measurement is accurate.In addition, because potential electrode can be taken off its convenient disassembly by the dismounting stationary installation from measurement bracket.
Description of drawings
Fig. 1 is the utility model slurries pH value measurement mechanism pipeline connection diagram.
Fig. 2 is a potential electrode mounting structure synoptic diagram in the measurement bracket.
Fig. 3 is the decomposing schematic representation of potential electrode and stationary installation among Fig. 2.
Among the figure
1. measurement bracket 2. flow control valves 3. potential electrode 4. electrode supporting pieces
5. closed end cap 6. potential electrode leads 7. electrode mounts 8. flanges
9. clean branch road 10. slurries branch roads 11. diaphragm valves 12. measurement bracket inlet
13. measurement bracket is from flow export
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, Fig. 2, slurries pH value measurement mechanism of the present utility model, comprise potential electrode 3, be provided with one at the slurries discharge line and measure bypass, in the measurement bypass, be provided with measurement bracket 1 and flow control valve 2, be used to regulate the flow of measuring bypass, be provided with cleaning branch road 9 at described measurement bypass flow variable valve 2 front ends, form and clean branch road 9 and 10 2 branch roads of slurries branch road, on cleaning branch road 9 and slurries branch road 10, be respectively equipped with diaphragm valve 1, when measuring, close the diaphragm valve 1 that cleans on the branch road 9, open the diaphragm valve 1 on the slurries branch road 10, make the ducted slurry stream of slurries cross measurement bracket 1; Carry out the measurement of slurries pH value, and close the diaphragm valve 1 on the slurries branch road 10 when cleaning, open the diaphragm valve 1 that cleans on the branch road 9, potential electrode 3 is cleaned, cleaning branch road 9 can connect the fresh water (FW) pipeline in water source or the production.Described measurement bracket 1 is the reducing tee pipe fitting that inlet diameter is little, mid diameter is big, described inlet 12 is located at the lower end of measurement bracket 1, it is located at measurement bracket 1 near on the sidewall of upper end from flow export 13, and described potential electrode 3 stretches in measurement bracket 1 pipe from measurement bracket 1 upper end, and is installed in measurement bracket 1 upper end by stationary installation 4,5,7.Described flow control valve 2 can be manual pipe clip valve.
Described potential electrode 3 can be the immersion glass electrode.
Referring to Fig. 2, Fig. 3, described stationary installation comprises the electrode supporting piece 4 that is made of plastics and closed end cap 5 with holes, described electrode supporting piece 4 links to each other with measurement bracket 1 upper end, in the middle of electrode supporting piece 4, be provided with mounting hole, the peripheral upwards annular protrusion of mounting hole also is provided with screw thread, described potential electrode 3 inserts in mounting hole and by closed end cap 5 and is tightened, described potential electrode lead 6 is upwards drawn from closed end cap 5 holes, stationary installation adopts electrode supporting piece 4 and this structure of closed end cap, can potential electrode 3 for convenience detach.Described potential electrode 3 upper ends also are connected with electrode mount 7, these electrode mount 7 hollows and lower end have screw, the upper end has the convex shoulder of diameter greater than described mounting hole, and be provided with respective threads in described potential electrode 3 upper ends, described potential electrode 3 is installed on electrode mount 7 and its lead 13 is upwards drawn from electrode mount 7 and closed end cap 5, adopt can extend potential electrode 3 extension elongations and fully being soaked in the slurries of electrode mount 7, measurement effect is better.
Be provided with flange 8 in measurement bracket 1 upper end, described electrode supporting piece 4 is connected with measurement bracket 1 by flange 8.Described measurement bracket 1 can be made of metal, and the inside lining anti-corrosive coating is as rubber liner etc.
This programme is to have designed special-purpose PH instrumentation buret road and electrode measurement support and annex at wet desulfurizing process.It realizes the measuring task of immersion electrode realization flow type electrode in conjunction with the advantage of flow type electrode and immersion electrode by the measurement pipeline of design.This programme potential electrode adopts the simple glass electrode, it is simple easy that the mounting bracket realization of passing through is measured, washes, demarcated: by special-purpose PH measurement pipeline and PH meter mounting bracket are set, guarantee to be in the normal pressure situation (when the PH electrode cleans at the pressure of PH electrode measurement place medium, on-stream pressure is not more than 0.2MPa), can adopt common glass electrode to measure the pH value of slurries in the mode of immersion like this.Adopt special-purpose PH electrode support frame, dismantle fast, easily electrode (need not instrument, satisfy in the real work quick demarcation to the PH electrode.
For concentration of slurry at 10 ~ 30% wet flue gas desulfurization absorption tower slurries, a pipeline that is used for PH instrumentation amount is set on the pipeline of absorption tower slurries extraction pump, and its flow is selected at 0.8 ~ 1.3m/s (to avoid causing owing to flow velocity is too high influence to main system according to the slurry medium flow velocity; The too low slurries of flow velocity deposit in pipeline, influence flowing of medium).
Between measurement bracket 1 and slurries inlet diaphragm valve 11, a manual pipe clip valve is set, is used to control the slurries amount that measurement bracket 1 is measured in the chamber that enters, can only be to guarantee to enter the slurries of measuring the chamber from exporting 13 from flowing back into Returning pipe.Simultaneously, this valve also is used to control wash-down water and enters the flow velocity of measuring the chamber, directly the head of potential electrode 3 is washed with the fresh water (FW) that prevents excess pressure, damages electrode.
The installation support member 4 of potential electrode 3 and electrode mount 7 adopt plastic material, to guarantee that medium can not produce corrosion to it.
Can the extend extension elongation of in measuring chamber electrode 3 of potential electrode fabricated section 7 can fully be immersed in the slurries measure portion of electrode 3.
The connected mode of electrode supporting piece 4 designs simultaneously and potential electrode fabricated section 7 adopts externally threaded closed end cap 5, can dismantle the PH potential electrode easily like this.
With way of example the utility model is illustrated above, but the utility model is not limited to above-mentioned specific embodiment the protection domain that all any improvement done based on the utility model or modification all belong to the utility model claim.
Claims (8)
1. slurries pH value measurement mechanism, comprise potential electrode, it is characterized in that: be provided with one at the slurries discharge line and measure bypass, in the measurement bypass, be provided with measurement bracket and flow control valve, described measurement bracket is the reducing tee pipe fitting that inlet diameter is little, mid diameter is big, described inlet is located at the lower end of measurement bracket, measurement bracket is located near on the sidewall of upper end from flow export, and described potential electrode stretches in the measurement bracket pipe from the measurement bracket upper end, and is installed in the measurement bracket upper end by stationary installation.
2. slurries pH value measurement mechanism according to claim 1 is characterized in that: described potential electrode is the immersion glass electrode.
3. slurries pH value measurement mechanism according to claim 1, it is characterized in that: described stationary installation comprises the electrode supporting piece that is made of plastics and closed end cap with holes, described electrode supporting piece links to each other with the measurement bracket upper end, in the middle of electrode supporting piece, be provided with mounting hole, the peripheral upwards annular protrusion of mounting hole also is provided with screw thread, described potential electrode inserts in mounting hole and by closed end cap and is tightened, and described potential electrode lead is upwards drawn from the closed end cap hole.
4. slurries pH value measurement mechanism according to claim 3, it is characterized in that: described potential electrode upper end also is connected with electrode mount, this electrode mount hollow and lower end have screw, the upper end has the convex shoulder of diameter greater than described mounting hole, and being provided with respective threads in described potential electrode upper end, described potential electrode is installed on electrode mount and its lead is upwards drawn from electrode mount and closed end cap.
5. slurries pH value measurement mechanism according to claim 3 is characterized in that: be provided with flange in the measurement bracket upper end, described electrode supporting piece is connected with measurement bracket by flange.
6. slurries pH value measurement mechanism according to claim 1, it is characterized in that: described measurement bracket is made of metal, the inside lining anti-corrosive coating.
7. slurries pH value measurement mechanism according to claim 1 is characterized in that: be provided with the cleaning branch road at described measurement bypass pipe clip valve front end, form and clean branch road and two branch roads of slurries branch road, be respectively equipped with diaphragm valve on cleaning branch road and slurries branch road.
8. slurries pH value measurement mechanism according to claim 1 is characterized in that: described flow control valve is a pipe clip valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201757230U CN201096740Y (en) | 2007-09-28 | 2007-09-28 | Plasm PH value measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201757230U CN201096740Y (en) | 2007-09-28 | 2007-09-28 | Plasm PH value measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201096740Y true CN201096740Y (en) | 2008-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201757230U Expired - Lifetime CN201096740Y (en) | 2007-09-28 | 2007-09-28 | Plasm PH value measuring device |
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| CN (1) | CN201096740Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101458224A (en) * | 2009-01-06 | 2009-06-17 | 大连华城电子有限公司 | On-line cleaner for environment protection desulphurization PH value detector |
| CN103630290A (en) * | 2012-08-17 | 2014-03-12 | 上海华虹宏力半导体制造有限公司 | Aluminum etching cavity pressure gauge pipeline with bypass protection |
| CN105006991A (en) * | 2015-07-22 | 2015-10-28 | 上海交通大学 | Laminated piezoelectric downhole energy collection device |
-
2007
- 2007-09-28 CN CNU2007201757230U patent/CN201096740Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101458224A (en) * | 2009-01-06 | 2009-06-17 | 大连华城电子有限公司 | On-line cleaner for environment protection desulphurization PH value detector |
| CN101458224B (en) * | 2009-01-06 | 2013-05-08 | 大连华城电子有限公司 | On-line cleaner for environment protection desulphurization PH value detector |
| CN103630290A (en) * | 2012-08-17 | 2014-03-12 | 上海华虹宏力半导体制造有限公司 | Aluminum etching cavity pressure gauge pipeline with bypass protection |
| CN103630290B (en) * | 2012-08-17 | 2016-06-08 | 上海华虹宏力半导体制造有限公司 | Aluminum etch chamber pressure gauge pipeline with bypass protection |
| CN105006991A (en) * | 2015-07-22 | 2015-10-28 | 上海交通大学 | Laminated piezoelectric downhole energy collection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080806 |