CN105223254A - A kind of sampling pre-service and multithread road switch PH measurement mechanism - Google Patents
A kind of sampling pre-service and multithread road switch PH measurement mechanism Download PDFInfo
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- CN105223254A CN105223254A CN201510779272.0A CN201510779272A CN105223254A CN 105223254 A CN105223254 A CN 105223254A CN 201510779272 A CN201510779272 A CN 201510779272A CN 105223254 A CN105223254 A CN 105223254A
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Abstract
A kind of sampling pre-service and multithread road switch PH measurement mechanism, relate to a kind of sampling pretreatment device of sample solution, be made up of porcelain filter, membrane pump, Buffer Pool, flow cell, PH electrode, PH transmitter, PH electrode clean system, PLC and multiple solenoid valve; Deliver to shared PH measurement instrument after realizing the automatic switchover of multi-measuring point sampling stream, filtration, cooling to measure, DCS system reads and display measurement data.
Description
Technical field
The present invention relates to a kind of sampling pretreatment device of sample solution.
Background technology
Need measure accurately leaching pulp PH value, acid concentration, concentration of metal ions etc. and analyze in the extract technology of nonferrous metallurgy industry production.Be measured as example with pH value, because measured medium is the dirty fluid of liquid-solid mixing, very easily cause the fouling of electrode sensitive film, measurement performance is worsened rapidly cause the delayed and distortion of measurement data.Conventional online test method is the PH measuring system of a set of belt electrode automatic flushing device of each measuring configuration.Adopt the cleaning of electrode self-timing, though improve electrode measurement sensitivity and extend the scalar period of electrode, but cleaning performance is still undesirable, and medium temperature is up to 80 ~ 95 DEG C, exceed the ultimate-use (limiting service) temperature of electrode, accelerate the aging of electrode, the average life of electrode is still less than 20 days.The maintenance workload that above-mentioned situation causes the on-line detecting system of pH value excessive and operating cost, add the difficulty of PH measuring system normally operation and application for a long time, also have influence on normal technological operation simultaneously, reduce production efficiency.
Summary of the invention
For above problem, the present invention proposes a kind of sampling pretreatment device realized with measuring point sample solution multiple in one set of instrument or instrumental analysis flow process.This device is delivered to shared PH measurement instrument after realizing the automatic switchover of multi-measuring point sampling stream, filtration, cooling and is measured, and DCS system reads and display measurement data.Because multiple measuring point adopts a set of sampled measurements system, greatly reduce equipment cost, operating cost and maintenance workload.Common electrode and solution cooling processing, decrease the serviceable life using electrode, substantially prolongs electrode.The monitoring of accurate stable can be realized to wet metallurgical leaching process pulp PH value by this device.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of sampling pre-service and multithread road switch PH measurement mechanism, the filtration fraction of submerged filter F1-Fn is immersed in the measured medium of n destination sample point, filtrator cavity bottom is inserted in sampling pipe one end, the n root sample liquid cooling tube of other end difference adapter sleeve cartridge type refrigeratory CL, pneumatic diaphragm pump PM inlet is accessed after the sampling valve SV1-SVn arranged through correspondence after sample liquid pipe passes from telescopic refrigeratory CL imports house steward, pneumatic diaphragm pump PM liquid outlet is by pipeline Connection Pool BC, the isolation valve EV1 that connecting tube between pneumatic diaphragm pump PM and Buffer Pool BC is provided with, the driving gas source pipe of pneumatic diaphragm pump PM is provided with driver's valve EV6, Buffer Pool BC is provided with leakage fluid dram and overflow vent, leakage fluid dram is divided into two branch pipe(tube)s after being picked out by pipeline, in one of them branch pipe(tube) access measuring cell FC, this branch pipe(tube) is provided with liquid feed valve EV2, another one branch pipe(tube) is connected to liquid header, this branch pipe(tube) is provided with Buffer Pool tapping valve EV3, overflow vent is connected to liquid header by run-down pipe, PH potential electrode is inserted in measuring cell FC and is measured, measuring cell FC is provided with leakage fluid dram and overflow vent, leakage fluid dram is connected to liquid header by pipeline, this pipeline is provided with measuring cell tapping valve EV4, overflow vent is connected to liquid header by run-down pipe, the discharge opeing of Buffer Pool and measuring cell and overflow import liquid header and are discharged into technique chute, recoil water pipe with backwash valve EV8 and the Air Reverse blowpipe with back-flushing valve EV7 to be connected between sampling valve and pneumatic diaphragm pump PM on gathering tube, described Buffer Pool BC establishes liquid level detecting switch LS, flow switch FS established by the cooling water pipe of described double-pipe cooler CL, the cleaning of multithread road switch sampling, measurement and sampling system is controlled automatically to carry out by PLC, and rate-determining steps is as follows:
Before work, all autovalves and membrane pump are closed;
The first step: open sampling valve SV1 and backwash valve EV8, the sampling pipeline of backwash sampled point 1 and upsampling filter F1, timing t 1 second;
Second step: close backwash valve EV8, opens back-flushing valve EV7 blowback and empties the raffinate that sampled point 1 samples in pipeline, timing t 2 seconds,
3rd step: arrive when timing t 2 time, close back-flushing valve EV7, start pneumatic diaphragm pump PM, open isolation valve EV1 and Buffer Pool tapping valve EV3, the tested sample liquid of sampled point flows through submerged filter filtration, double-pipe cooler CL cooling, sampling valve SV1, pump PM, isolation valve EV1, Buffer Pool BC, Buffer Pool tapping valve EV3, carry out clean-up line and Buffer Pool, timing t 3 seconds;
4th step: close Buffer Pool tapping valve EV3, pond BC to be buffered is full of, and when level switch LS detects that liquid level is full, its output contact closes;
5th step: PLC receives liquid level detecting switch LS contact close signal, closes sampling valve SV1, pneumatic diaphragm pump PM, isolation valve EV1, opens liquid feed valve EV2 and measuring cell tapping valve EV4, rinses measuring cell FC, timing t 4 seconds; While closedown isolation valve EV1, enter pipeline cleaning and the sampling of next sampled point: open next sampling valve, then carry out the action of the first step to the 5th step; And in timing t 4 time to the measuring process namely entering this sample liquid: follow-up six to ten one step;
6th step: close measuring cell tapping valve EV4, pond FC to be measured is full of, timing t 5 seconds;
7th step: open the emptying Buffer Pool BC of Buffer Pool tapping valve EV3, close liquid feed valve EV2, timing t 6 seconds, allows PH electrode A E soak certain hour in sample liquid, be now the PH measurement amount stabilization sub stage, after PH indicating value is stable, PLC provides on-off model DO1 to DCS system;
8th step: DCS system receives PLC_DO1 signal, reads sampled point 1 effectively PH measuring-signal, and keeps read value to arrive next measuring period of renewal;
9th step: open the emptying measuring cell FC of measuring cell tapping valve EV4, timing t 8 seconds, enter the measuring process of next sampled point sample liquid: namely perform the subsequent step from the 6th step;
Tenth step: when last sampled point sample liquid of measuring period is measured complete, open electrode clean valve EV5, timing t 9 seconds, cleans PH electrode;
11 step: close EV5, timing t 10 seconds, enters the measurement in next cycle; Go round and begin again, the periodicity completing n sampled point patrols survey.
more preferably:described measuring cell FC is also provided with electrode cleaning device, comprises cleaning shower nozzle, cleaning valve EV5, water-blaster SS, clean-out system bucket and connecting pipe; Rinse water, after clean-out system mixing in water-blaster SS suction clean-out system bucket, is cleaned PH electrode sensitive film through cleaning valve EV5 and shower nozzle.
more preferably:described sample solution filter F 1-Fn is immersion porcelain filter, and each sampled point is arranged respectively, is convenient for changing and carries out manual cleaning.
more preferably:replacing the PH potential electrode inserted in measuring cell FC is the sampling pipe of other online analytical instrument, can be used as sampling pre-service and the multithread circuit switching device of other online analytical instrument, realizes the multithread road on-line analysis of other composition in solution.
more preferably:described n value is 1-5, and described t1-t9 is time parameter, and accumulated value is less than 2 minutes, and its numerical value is arranged on PLC.
advantageous Effects
The present invention's multiple measuring points of a set of instrument and sampling apparatus measurement procedure.Adopt the sampling switching of PLC control multithread road, the cleaning of sampling system, PH measures and electrode cleans automatically.High temperature, high solids medium are filtered, then measure after cooling, decrease maintenance workload, use number of electrodes and extend the plurality of advantages such as electrode life, make the operating cost of flow process pH value observing and controlling lower simultaneously, measure more accurately and reliably.
Adopt pneumatic diaphragm pump draw samples liquid and multiple sampling valve switch sample liquid, extract corresponding measuring point sample liquid by control pneumatic diaphragm pump and corresponding sampling valve, measure to measuring cell through immersion upsampling filter, double-pipe cooler, sampling valve, pneumatic diaphragm pump, Buffer Pool; By regulating the adjustable sample liquid uninterrupted of pneumatic diaphragm pump bleed pressure;
Arrange double-pipe cooler, sampled point sample liquid flow carries out measuring after heat interchange is cooled to proper temperature through double-pipe cooler and chilled water, reduces the working temperature of electrode, extends the serviceable life of electrode;
Sampled point adopts immersion upsampling filter, and what make to enter sampling system is cleaner solution, can not cause the blocking of system;
Arrange backwash valve and back-flushing valve, by sample with water or cleaning fluid cleaning pipeline and filtrator, then use pressurized air blowback, before making sampling, pipeline Liquid Residue is emptying, to ensure the authenticity of sample liquid and to reduce and avoid the mutual interference of sample liquid as far as possible;
Isolation valve is set and is placed in pneumatic diaphragm pump discharge, measure to measuring cell in order to cut off sample liquid flow in the sampling backwash blowback of stream and Buffer Pool.Like this, by controlling isolation valve and liquid feed valve, make the measurement of this sample liquid and next sampled point sampling stream backwash blowback, sample liquid sampling can carry out simultaneously, shorten time measuring period, each measuring point Measuring Time < 2 minutes can be reached;
Arrange on runner pipe that liquid feed valve is placed between Buffer Pool and measuring cell, to control the break-make of solution between Buffer Pool and measuring cell.The bottom of Buffer Pool is higher than measuring cell top, and Buffer Pool solution enters measuring cell because of the gravity flow of the discrepancy in elevation between the two.
Buffer Pool is set, the pulse flow of mild membrane pump outlet sample liquid and pressure, and it is used in order to measuring to store sample liquid;
Buffer Pool top is provided with level switch, when sample liquid is full of in Buffer Pool, controls membrane pump and stops and isolation valve shutoff;
Measuring cell is set for store sampled solution and installation PH potential electrode;
PH measuring transducer is set and receives PH potential electrode signal, be converted to 4-20mA output signal and deliver to DCS system AI load module.When PLC of the present invention provides PH valid data read switch amount signal, DCS reads pH value and remains to measurement updaue next time;
Arrange cleaning shower nozzle, cleaning valve and water-blaster, cleaning shower nozzle is installed on electrode sensitive film parallel position in measuring cell.After often completing a measuring period, open cleaning valve, drawn by the hydrojet of water-blaster a certain amount of clean-out system mixing after, through cleaning shower nozzle, jet cleaning is carried out to PH electrode sensitive film, prevent the film fouling of PH electrode sensitive thus the sensitivity of maintenance measurement and accuracy;
Blowback pressurized air reduction valve and pneumatic diaphragm pump pressurized air reduction valve are set, to regulate suitable blowback pressure and suitable sampling flow.
The pH value on-line checkingi of 4 measuring points is realized for the present invention:
The PH measuring system adopting conventional belt electrode automatically to clean often overlaps about 50,000 yuan, 4 totally 20 ten thousand yuan, covers.Adopt the present invention's a set of estimation 6-7 ten thousand yuan, can investment reduction more than 60%.
In operating cost, the mainly consumption of electrode.As previously mentioned, the average life of leaching operation electrode at zinc hydrometallurgy is 20 days, within 1 year, needs sacrificial electrode 16 by 320 days production times each measuring point, and 4 measuring points totally 64, often prop up about 4,000 yuan, electrode, need consumption of electrode cost 25.6 ten thousand yuan altogether.Adopt the present invention, solution is cooled to less than 60 DEG C to slow down ageing of electrode, and electrode life at least can increase by 3 times, annual consumption of electrode 5.33, cost 2.132 ten thousand yuan.Electrode cost 23.468 ten thousand yuan can be saved every year.
In operation maintenance, according to our use experience at leaching process, PH electrode will once be demarcated for 2 ~ 4 days, and within about 20 days, change electrode, maintenance workload is larger.If safeguard improper or safeguard not in place, bring larger uncertainty by the normal operation of equipment.The present invention greatly reduces the quantity of equipment and electrode, improves the cleaning performance of electrode, extends the scalar period of electrode, thus greatly reduces maintenance.And each measuring point due to technological process adopts same instrument to measure, and each point measuring error is convergent, avoid the uncertain error adopting different instrument measurement to bring, be more conducive to technological operation and control.
Accompanying drawing explanation
Fig. 1: system construction drawing of the present invention;
Fig. 2: PLC automatic control flow chart figure in the embodiment of the present invention.
In figure, F1-Fn is submerged filter, and CL is telescopic refrigeratory, and SV1-SVn is sampling valve, PM is pneumatic diaphragm pump, and EV1 is isolation valve, and BC is Buffer Pool, and LS is liquid level detecting switch, FS is flow switch, and EV2 is liquid feed valve, and EV3 is Buffer Pool tapping valve, and EV4 is measuring cell tapping valve, EV5 is cleaning valve, and EV6 is driver's valve, and EV7 is back-flushing valve, EV8 is backwash valve, and FC is measuring cell, and AE is PH electrode, AT is PH transmitter, and SS is water-blaster, and GL is line strainer.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, to facilitate the technical staff to understand.
In embodiment 1: Fig. 1, the above element in separatrix and instrument are arranged on stainless steel base plate, 4 PH measuring points in the corresponding flow process of sampled point 1-4, every sampled point arranges submerged filter F1-F4, be arranged in reactive tank exit chute, its filtration fraction submergence in media as well, the negative pressure produced by pneumatic diaphragm pump PM makes solution enter filtrator cavity by filtering surface, sampling pipe inserts cavity bottom, submerged filter F1-F4 porcelain filter, sampling pipe connector and mounting bracket composition, replaceable, be convenient for changing when its strainability obviously declines and carry out manual cleaning, telescopic refrigeratory CL outer tube and cooling water flow siphunculus adopt DN40304 stainless-steel tube, closed at both ends, n root ￠ 8 × 1.0 titanium or 316L stainless steel sample liquid pipe pass outer tube by end face, sample liquid pipe one termination upsampling filter, the other end is connected with sampling valve, and there is cooling water outlet and inlet at telescopic refrigeratory CL outer tube two ends, sample liquid outflow end is water inlet, the other end is water delivering orifice, and the length of CL is 5-6m, the size of visual response groove and installation site and determine, cooling water flow switch FS adopts economical flow sensor, and its output switch parameter access PLC carries out cutout and reports to the police, sampling valve SV1-SV4 is DN8 stainless steel electrical ball valve or circulating direction is two-way corrosion-resistant plastic solenoid valve, pneumatic diaphragm pump PM adopts A.025P-6mm type Wilden pneumatic diaphragm pump, maximum flow 17l/min, and maximum dry inhales journey 4m, by regulating compressed-air actuated pressure to regulate membrane pump for comparatively low discharge, makes high temperature sample liquid obtain good cooling effect through subcooler, EV1-EV5, EV8 are DN6 bore corrosion-proof solenoid valve, and EV6-EV7 is DN3 bore general solenoid valve, Buffer Pool BC and measuring cell FC PP plastic production, Buffer Pool BC volume is 550-600ml, measuring cell FC volume is about 250ml, and Buffer Pool BC level switch LS is non-contact capacitance level switch, and its switching value liquid level warning exports access PLC and controls closing down of membrane pump and isolation valve, in the present embodiment, also comprise for PH electrode clean plastic nozzle, be arranged on measuring cell and PH electrode sensitive film parallel position, organic glass water-blaster mixed liquor flow about 0.5l/min, water-blaster inlet tube also arranges line strainer GL, by the impurity filtering in water, avoids blocking.
What be necessary to herein means out is that the present embodiment is only used to further illustrate the present invention; but this embodiment should not be construed as limiting the scope of the invention, the person skilled in the art in this field can make some nonessential improvement and adjustment according to the content of the invention described above.
Claims (5)
1. a sampling pre-service and multithread road switch PH measurement mechanism, it is characterized in that, the filtration fraction of submerged filter F1-Fn is immersed in the measured medium of n destination sample point, filtrator cavity bottom is inserted in sampling pipe one end, the n root sample liquid cooling tube of other end difference adapter sleeve cartridge type refrigeratory CL, pneumatic diaphragm pump PM inlet is accessed after the sampling valve SV1-SVn arranged through correspondence after sample liquid pipe passes from telescopic refrigeratory CL imports house steward, pneumatic diaphragm pump PM liquid outlet is by pipeline Connection Pool BC, the isolation valve EV1 that connecting tube between pneumatic diaphragm pump PM and Buffer Pool BC is provided with, the driving gas source pipe of pneumatic diaphragm pump PM is provided with driver's valve EV6, Buffer Pool BC is provided with leakage fluid dram and overflow vent, leakage fluid dram is divided into two branch pipe(tube)s after being picked out by pipeline, in one of them branch pipe(tube) access measuring cell FC, this branch pipe(tube) is provided with liquid feed valve EV2, another one branch pipe(tube) is connected to liquid header, this branch pipe(tube) is provided with Buffer Pool tapping valve EV3, overflow vent is connected to liquid header by run-down pipe, PH potential electrode is inserted in measuring cell FC and is measured, measuring cell FC is provided with leakage fluid dram and overflow vent, leakage fluid dram is connected to liquid header by pipeline, this pipeline is provided with measuring cell tapping valve EV4, overflow vent is connected to liquid header by run-down pipe, the discharge opeing of Buffer Pool and measuring cell and overflow import liquid header and are discharged into technique chute, recoil water pipe with backwash valve EV8 and the Air Reverse blowpipe with back-flushing valve EV7 to be connected between sampling valve and pneumatic diaphragm pump PM on gathering tube, described Buffer Pool BC establishes liquid level detecting switch LS, flow switch FS established by the cooling water pipe of described double-pipe cooler CL, the cleaning of multithread road switch sampling, measurement and sampling system is controlled automatically to carry out by PLC, and rate-determining steps is as follows:
Before work, all autovalves and membrane pump are closed;
The first step: open sampling valve SV1 and backwash valve EV8, the sampling pipeline of backwash sampled point 1 and upsampling filter F1, timing t 1 second;
Second step: close backwash valve EV8, opens back-flushing valve EV7 blowback and empties the raffinate that sampled point 1 samples in pipeline, timing t 2 seconds,
3rd step: arrive when timing t 2 time, close back-flushing valve EV7, start pneumatic diaphragm pump PM, open isolation valve EV1 and Buffer Pool tapping valve EV3, the tested sample liquid of sampled point flows through submerged filter filtration, double-pipe cooler CL cooling, sampling valve SV1, pump PM, isolation valve EV1, Buffer Pool BC, Buffer Pool tapping valve EV3, carry out clean-up line and Buffer Pool, timing t 3 seconds;
4th step: close Buffer Pool tapping valve EV3, pond BC to be buffered is full of, and when level switch LS detects that liquid level is full, its output contact closes;
5th step: PLC receives liquid level detecting switch LS contact close signal, closes sampling valve SV1, pneumatic diaphragm pump PM, isolation valve EV1, opens liquid feed valve EV2 and measuring cell tapping valve EV4, rinses measuring cell FC, timing t 4 seconds; While closedown isolation valve EV1, enter pipeline cleaning and the sampling of next sampled point: open next sampling valve, then carry out the action of the first step to the 5th step; And in timing t 4 time to the measuring process namely entering this sample liquid: follow-up six to ten one step;
6th step: close measuring cell tapping valve EV4, pond FC to be measured is full of, timing t 5 seconds;
7th step: open the emptying Buffer Pool BC of Buffer Pool tapping valve EV3, close liquid feed valve EV2, timing t 6 seconds, allows PH electrode A E soak certain hour in sample liquid, be now the PH measurement amount stabilization sub stage, after PH indicating value is stable, PLC provides on-off model DO1 to DCS system;
8th step: DCS system receives PLC_DO1 signal, reads sampled point 1 effectively PH measuring-signal, and keeps read value to arrive next measuring period of renewal;
9th step: open the emptying measuring cell FC of measuring cell tapping valve EV4, timing t 8 seconds, enter the measuring process of next sampled point sample liquid: namely perform the subsequent step from the 6th step;
Tenth step: when last sampled point sample liquid of measuring period is measured complete, open electrode clean valve EV5, timing t 9 seconds, cleans PH electrode;
11 step: close EV5, timing t 10 seconds, enters the measurement in next cycle; Go round and begin again, the periodicity completing n sampled point patrols survey.
2. one sampling pre-service according to claim 1 and multithread road switch PH measurement mechanism, and it is characterized in that, described measuring cell FC is also provided with electrode cleaning device, comprise cleaning shower nozzle, cleaning valve EV5, water-blaster SS, clean-out system bucket and connecting pipe; Rinse water, after clean-out system mixing in water-blaster SS suction clean-out system bucket, is cleaned PH electrode sensitive film through cleaning valve EV5 and shower nozzle.
3. according to claims 1 or 2 any one one sampling pre-service and multithread road switch PH measurement mechanism, it is characterized in that, described sample solution filter F 1-Fn is immersion porcelain filter, and each sampled point is arranged respectively, is convenient for changing and carries out manual cleaning.
4. a kind of PH measurement mechanism according to claim 3, it is characterized in that, replacing the PH potential electrode inserted in measuring cell FC is the sampling pipe of other online analytical instrument, can be used as sampling pre-service and the multithread circuit switching device of other online analytical instrument, realize the multithread road on-line analysis of other composition in solution.
5. a kind of PH measurement mechanism according to claim 4, is characterized in that, described n value is 1-5, and described t1-t9 is time parameter, and accumulated value is less than 2 minutes, and its numerical value is arranged on PLC.
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Cited By (3)
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| CN106841356A (en) * | 2017-01-12 | 2017-06-13 | 杭州原创软件有限公司 | A kind of self-cleaning pH on-line monitoring systems |
| CN110823981A (en) * | 2019-11-22 | 2020-02-21 | 铜陵有色金属集团股份有限公司 | Device and method for automatically cleaning PH electrode |
| CN113899588A (en) * | 2021-11-08 | 2022-01-07 | 泸州北方纤维素有限公司 | Sampling detection device for ethyl cellulose washing kettle and construction method |
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| CN113899588A (en) * | 2021-11-08 | 2022-01-07 | 泸州北方纤维素有限公司 | Sampling detection device for ethyl cellulose washing kettle and construction method |
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