CN205263025U - PH measuring device is switched on sampling preliminary treatment and multithread way - Google Patents

Abstract

The utility model provides a PH measuring device is switched on sampling preliminary treatment and multithread way, relates to the sampling preprocessing device of a sample solution, comprises porcelain filter, diaphragm pump, buffer pool, flow -through cell, PH electrode, PH changer, PH electrode cleaning system, PLC and a plurality of solenoid valve, realize the PH measuring instrument of sending the sharing after many measurement stations samplings flow path automatic switch -over, filtration, the cooling to and measure that the DCS system reads and shows measured data.

Description

PH measurement mechanism is switched on a kind of sampling pretreatment and multithread road

Technical field

The utility model relates to a kind of sampling pretreatment device of sample solution.

Background technology

In the extract technology of nonferrous metallurgy industry production, need measure accurately and analyze leaching pulp PH value, acid concentration, concentration of metal ions etc. 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 and cause measurement data to lag behind and distortion. Conventional online test method is the PH measuring system that each measurement point configures a set of belt electrode automatic flushing device. Adopt electrode self-timing to clean, though improved electrode measurement sensitivity and extended demarcation cycle 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, accelerated the aging of electrode, the average life of electrode still less than 20 days. Above-mentioned situation causes the excessive maintenance workload of the on-line detecting system of pH value and operating cost, has increased the difficulty of the long-term normal operation of PH measuring system and application, also has influence on normal technological operation simultaneously, has reduced production efficiency.

Summary of the invention

For above problem, the utility model proposes a kind of sampling pretreatment device of realizing with multiple measuring point sample solutions in a set of instrument or instrumental analysis flow process. This device realizes the automatic switchover of multi-measuring point sampling stream, filtration, deliver to shared PH measuring instrument after cooling measures, and DCS system reads and display measurement data. Because multiple measuring points adopt a set of sampled measurements system, equipment cost, operating cost and maintenance workload are greatly reduced. Common electrode and solution cooling processing, reduced the service life that uses electrode, greatly extended electrode. Can realize to wet metallurgical leaching process pulp PH value the monitoring of accurate stable by this device.

The utility model solves the technical scheme that its technical problem adopts:

PH measurement mechanism is switched on a kind of sampling pretreatment and multithread road, the filtration fraction of immersion filter F 1-Fn is immersed in the measured medium of n target sampled point, filter cavity bottom is inserted in sampling pipe one end, the other end is the n root sample liquid cooling tube of adapter sleeve cartridge type cooler CL respectively, sample liquid cooling tube accesses pneumatic diaphragm pump PM inlet after the sampling valve SV1-SVn through correspondence setting imports house steward after passing telescopic cooler CL, pneumatic diaphragm pump PM liquid outlet connects Buffer Pool BC by pipeline, between pneumatic diaphragm pump PM and Buffer Pool BC, be connected by connecting pipe, in connecting pipe, be provided with isolating valve EV1, 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 overfall, leakage fluid dram is divided into two branch pipe(tube)s after picking out by pipeline, in one of them branch pipe(tube) access measuring cell FC, on this branch pipe(tube), be 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, overfall is connected to liquid header by overflow pipe, PH measurement electrode is inserted in measuring cell FC and is measured, measuring cell FC is provided with leakage fluid dram and overfall, leakage fluid dram is connected to liquid header by pipeline, this pipeline is provided with measuring cell tapping valve EV4, overfall is connected to liquid header by overflow pipe, the discharge opeing of Buffer Pool and measuring cell and overflow import liquid header and are discharged into technique chute, be connected between sampling valve and pneumatic diaphragm pump PM on gathering tube with the recoil water pipe of backwash valve EV8 and with the Air Reverse blowpipe of back-flushing valve EV7, described Buffer Pool BC establishes liquid level detecting switch LS, the cooling water pipe of described telescopic cooler CL is established flow switch FS, the cleaning of multithread road switch sampling, measurement and sampling system is controlled automatically and is carried out by PLC.

More preferably: described measuring cell FC is also provided with electrode cleaning device, comprise and clean shower nozzle, cleaning valve EV5, water-blaster SS, cleaning agent bucket and tube connector. Rinse water, after water-blaster SS sucks the cleaning agent mixing in cleaning agent bucket, is cleaned PH electrode sensitive film through cleaning valve EV5 and shower nozzle.

More preferably: described immersion filter F 1-Fn is immersion ceramic filter, and each sampled point arranges respectively, is convenient for changing and carries out manual cleaning.

Useful technique effect

Multiple measuring points of a set of instrument and sampling apparatus measurement procedure for the utility model. The cleaning, PH measurement and the electrode that adopt PLC to control the sampling switching of multithread road, sampling system clean automatically. High temperature, high solids medium are filtered, then measure after cooling, have reduced maintenance workload, have used number of electrodes and extended 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 controlling pneumatic diaphragm pump and corresponding sampling valve, measure to measuring cell through immersion resampling filter device, telescopic cooler, sampling valve, pneumatic diaphragm pump, Buffer Pool; By regulating the adjustable sample liquid flow of pneumatic diaphragm pump bleed pressure size;

Telescopic cooler is set, and sampled point sample liquid flow carries out after heat exchange is cooled to proper temperature measuring through telescopic cooler and cooling water, has reduced the operating temperature of electrode, has extended the service life of electrode;

Sampled point adopts immersion resampling filter device, and what make to enter sampling system is cleaner solution, can not cause the obstruction of system;

Backwash valve and back-flushing valve are set, clean sampling pipeline and filter by water or cleaning fluid, then use compressed air blowback, before making to sample, pipeline Liquid Residue is emptying, to ensure the authenticity of sample liquid and to reduce as far as possible and avoid the phase mutual interference of sample liquid;

Isolating 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 isolating valve and liquid feed valve, the measurement of this sample liquid and backwash blowback, the sample liquid sampling of next sampled point sampling stream can be carried out simultaneously, shortened time measuring period, can reach each measuring point Measuring Time < 2 minutes;

Liquid feed valve is set and is placed on the runner pipe 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 discrepancy in elevation gravity flow between the two.

Buffer Pool is set, pulse flow and the pressure of mild membrane pump outlet sample liquid, and storage sample liquid is used in order to measuring;

Buffer Pool top is provided with liquid-level switch, when sample liquid is full of in Buffer Pool, controls membrane pump and stops turn-offing with isolating valve;

Measuring cell is set for store sampled solution and PH measurement electrode is installed;

PH measuring transducer is set and receives PH measurement electrode signal, be converted to 4-20mA output signal and deliver to DCS system AI input module. In the time that PLC controller of the present utility model provides PH valid data read switch amount signal, DCS reads pH value and remains to next time and measures and upgrade;

Arrange and clean shower nozzle, cleaning valve and water-blaster, clean shower nozzle and be installed on electrode sensitive film parallel position in measuring cell. Often complete after the measuring period, open cleaning valve, draw after a certain amount of cleaning agent mixing by the water-jet of water-blaster, through cleaning shower nozzle, PH electrode sensitive film is carried out to jet cleaning, thereby prevent that the fouling of PH electrode sensitive film from keeping sensitivity and the accuracy measured;

Blowback compressed air pressure-reducing valve and pneumatic diaphragm pump compressed air pressure-reducing valve are set, to regulate suitable blowback pressure and suitable sampling flow.

The pH value of realizing 4 measuring points taking the utility model detects online as example:

Adopt approximately 50,000 yuan, the automatic every cover of PH measuring system cleaning of conventional belt electrode, 4 totally 20 ten thousand yuan, covers. Adopt ten thousand yuan of a set of estimation of the utility model 6-7, can save investment more than 60%.

Aspect operating cost, be mainly the consumption of electrode. As previously mentioned, be 20 days the average life of leaching operation electrode at zinc hydrometallurgy, within 1 year, needs 16 of sacrificial electrodes by each measuring point of 320 days production times, totally 64 of 4 measuring points, and approximately 4,000 yuan, every electrode, needs 25.6 ten thousand yuan of consumption of electrode costs altogether. Adopt the utility model, solution is cooled to 60 DEG C to slow down below ageing of electrode, and at least can increase by 3 times electrode life, 5.33 of annual consumption of electrodes, 2.132 ten thousand yuan of costs. Can save every year 23.468 ten thousand yuan of electrode costs.

Aspect operation maintenance, the use experience according to us at leaching process, PH electrode will once be demarcated for 2 ~ 4 days, about 20 days, changes electrode, and maintenance workload is larger. If safeguard improper or safeguard not in placely, the normal operation to equipment is brought to larger uncertainty. The utility model greatly reduces the quantity of equipment and electrode, has improved the cleaning performance of electrode, has extended the demarcation cycle of electrode, thereby has greatly reduced maintenance. And measure because each measuring point of technological process adopts same instrument, each point measure error is convergent, has avoided the uncertain error that adopts different instrument measurement to bring, and is more conducive to technological operation and control.

Brief description of the drawings

Fig. 1: system construction drawing of the present utility model;

Fig. 2: PLC automatic control flow chart figure in the utility model embodiment.

In figure, F1-Fn is immersion filter, and CL is telescopic cooler, and SV1-SVn is sampling valve, PM is pneumatic diaphragm pump, and EV1 is isolating 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 piping filter.

Detailed description of the invention

Below in conjunction with accompanying drawing, the utility model is described further, to facilitate the technical staff to understand.

Embodiment 1: in Fig. 1, the above element in line of demarcation 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 immersion filter F 1-F4, be arranged in reactive tank exit chute, its filtration fraction is immersed in medium, the negative pressure producing by pneumatic diaphragm pump PM makes solution enter filter cavity by filtering surface, sampling pipe inserts cavity bottom, immersion filter F 1-F4 ceramic filter, sampling pipe connector and mounting bracket composition, replaceable, in the time that its strainability obviously declines, be convenient for changing and carry out manual cleaning, telescopic cooler CL outer tube is that cooling water flow siphunculus adopts DN40304 stainless steel tube, closed at both ends, n root ￠ 8 × 1.0 titaniums or 316L stainless steel sample liquid cooling tube pass outer tube by end face, sample liquid cooling tube one termination resampling filter device, the other end is connected with sampling valve, and there is cooling water outlet and inlet at telescopic cooler CL outer tube two ends, sample liquid outflow end is water inlet, the other end is delivery port, 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, its switching value output access PLC warning that stops, sampling valve SV1-SV4 is that DN8 stainless steel electrical ball valve or circulating direction are two-way corrosion-resistant plastic magnetic valve, pneumatic diaphragm pump PM adopts A.025P-6mm type Wilden pneumatic diaphragm pump, maximum stream flow 17l/min, and maximum dry is inhaled journey 4m, by regulating compressed-air actuated pressure to regulate membrane pump for compared with 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 250ml left and right, and Buffer Pool BC liquid-level switch LS is non-contact capacitance liquid-level switch, and its switching value liquid level warning output access PLC controls closing down of membrane pump and isolating 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, lucite water-blaster mixed liquor flow 0.5l/min left and right, piping filter GL is also set on water-blaster inlet tube, by the impurity filtering in water, avoids stopping up.

Be necessary to be pointed out that at this present embodiment is only for being further described the utility model; but this embodiment should not be construed as the restriction to the utility model protection domain, the person skilled in the art in this field can make some nonessential improvement and adjustment according to above-mentioned content of the present utility model.

Claims (3)

1. sample pretreatment and multithread road switching PH measurement mechanism, it is characterized in that, the filtration fraction of immersion filter F 1-Fn is immersed in the measured medium of n target sampled point, filter cavity bottom is inserted in sampling pipe one end, the other end is the n root sample liquid cooling tube of adapter sleeve cartridge type cooler CL respectively, sample liquid cooling tube accesses pneumatic diaphragm pump PM inlet after the sampling valve SV1-SVn through correspondence setting imports house steward after passing telescopic cooler CL, pneumatic diaphragm pump PM liquid outlet connects Buffer Pool BC by pipeline, between pneumatic diaphragm pump PM and Buffer Pool BC, be connected by connecting pipe, in connecting pipe, be provided with isolating valve EV1, 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 overfall, leakage fluid dram is divided into two branch pipe(tube)s after picking out by pipeline, in one of them branch pipe(tube) access measuring cell FC, on this branch pipe(tube), be 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, overfall is connected to liquid header by overflow pipe, PH measurement electrode is inserted in measuring cell FC and is measured, measuring cell FC is provided with leakage fluid dram and overfall, leakage fluid dram is connected to liquid header by pipeline, this pipeline is provided with measuring cell tapping valve EV4, overfall is connected to liquid header by overflow pipe, the discharge opeing of Buffer Pool and measuring cell and overflow import liquid header and are discharged into technique chute, be connected between sampling valve and pneumatic diaphragm pump PM on gathering tube with the recoil water pipe of backwash valve EV8 and with the Air Reverse blowpipe of back-flushing valve EV7, described Buffer Pool BC establishes liquid level detecting switch LS, the cooling water pipe of described telescopic cooler CL is established flow switch FS, the cleaning of multithread road switch sampling, measurement and sampling system is controlled automatically and is carried out by PLC.

2. PH measurement mechanism is switched on a kind of sampling pretreatment according to claim 1 and multithread road, it is characterized in that, described measuring cell FC is also provided with electrode cleaning device, comprises and cleans shower nozzle, cleaning valve EV5, water-blaster SS, cleaning agent bucket and tube connector; Rinse water, after water-blaster SS sucks the cleaning agent mixing in cleaning agent bucket, is cleaned PH electrode sensitive film through cleaning valve EV5 and shower nozzle.

3. switch PH measurement mechanism according to one sampling pretreatment and multithread road described in claim 1 or 2 any one, it is characterized in that, described immersion filter F 1-Fn is immersion ceramic filter, and each sampled point arranges respectively, is convenient for changing and carries out manual cleaning.