SU836553A1 - System for analytic investigating of liquid samples - Google Patents

Description

(54) SYSTEM OF ANALYTICAL CONTROL OF LIQUID PUB

The invention relates to the field of analytical control samples of solutions and suspensions of metallurgical and chemical industries.

A well-known advanced analytical control system of the American firm AP, which is continuously sampling the primary sample from the controller, using a static probe from the transmitter connected to a switching device, which during each average 20-minute cycle sends a sample jet to the pump dpt transptsft a1 {Alizer for 3 minutes, the rest of the cycle time, the primary sample is discharged into the drainage pump to return to process 1.

A disadvantage of the known system is that, despite the continuity of the selection of the primary sample, a one-time micrometer is supplied to the spectrometer cell, which is not sufficiently reliable.

A known system of analytical control of liquids, containing a photomultiplier, a cumulative 1phob block and a receiving block

pneumatic conveying air section 1фоб, connected to the transport main, sample former, a flow circuit, including a spectrometric device with a flow cell, a pump and a relief valve, and a control computer complex 2.

The disadvantage of the system is its complexity, the low representativeness of the sampled sample and the inadequate reliability of the system.

The aim of the invention is to simplify the system, increase the representativeness of the samples and the reliability of the system.

This target is burned by the fact that the first air collection unit of the pneumatic conveying unit is equipped with a tank rigidly connected to it and is located above the former, the dump valve is made in the form of a cone, equipped with a trumpet for supplying compressed air and located between the vessel and the sample former, at the highest point of the flow loop, and the system is equipped with a sensor for monitoring the test sample through a flow cell located between the tank and the flow cell, while the output of the sensor is dinene with one input of the control computing complex. FIG. 1 shows a block diagram of the system (for one control point); in fig. 2 shows a general view of a receiving unit for air in the section for pneumatic transport of samples and the formation of the sample bodies. The system of analytical control of liquid samples contains a sampler 1 (Fig. 1) with a slit knife 2, which is installed at a difference in the controlled process flow 3. The drain of the slit knife U) of the sampler is connected to the accumulator block 4 of samples) which is connected via an electrofusion valve 5. to the compressed air network, and by means of the transport line 6 - to the gfeemnogo block 7 of the pneumatic conveying air separation n}}. The outlet 8 of the air separation unit 7 through the sensor 9 is connected to the cuvette 10 of the spectrometer by a jet pump 11 and the inlet 12 of the air separation unit 7, forming a circulation circuit. At the bottom discharge, the air separation unit 7 has a relief valve 13 (Fig. 2), which is open in the initial state. The pneumatic valve 14 of the valve is connected to the compressed air line by means of an electrically controlled vent 15. 15. OiaiiaH 13 the air separation unit is made in the form of a cone and is part of the cone of the former 16 samples, one outlet of which is connected to the drainage test panel OCT. For supplying the flush night water E, the air separation unit 7 has an electric control valve 18. The output of the sensor 9 for monitoring the continuous passage of the express train (r) through the cuvette 10 of the spectrometer is connected to one ' gates. An electrically driven fan 20 connects the compressed air line to the jet pump 11. The system of analytical control of liquid samples operates under the control and monitoring of the information-destructive computing complex in the following order. Oi6op single u) in the system is carried out using ui picking n 1 with slits with a knife 2. npo6ooT6qpHHK is installed on a pfepad controlled process stream 3, and a sample is taken by intersecting the entire formed flute with a knife at a constant speed; A single sample is obtained by collecting it for one cycle of its operation, gravity flows through the flexible block 4 by flow, and several single samples accumulate for some time (usually 30 minutes). In order to ensure the constancy of the volume of the sample being sent, the storage capacity of unit 4 is filled with water to the level of overflow. The sample is transported and transported by supplying compressed air to the storage unit 4 by means of an electroformed valve 5. The sample along the conveyed line 6 enters the receiving unit 7 for air separation (air separator), in which the transporting air is separated from the sample. Air escapes through the top opening of the air separator and is directed to the ventilation system. At the same time, the sample fills the capacity of the receiving unit 7 for air separation, since simultaneously with the supply of compressed air for transporting the sample, electrically controlled valve 15 supplies compressed air to the pneumatic drive 14 of the relief valve 13 and the latter tightly closes the drain of the air separator. As the container is filled, the sample fills the outlet tube 8 of the receiving air-separation unit to the level of the sensor for continuous monitoring of the passage of the rapid sample. A sensor, a photometric sensor that is configured for two discrete states of control can be used as a sensor (a pulp-shaped sample is in the sensor tube or a single state of the sensor; air or air bubbles are in the sensor tube or a zero state of the sensor ). In the initial state, the sensor is in the zero state and prohibits turning on the jet pump 11. If the tank is filled to the level of sensor 9, which O1 does not cause the minimum allowable volume of the express test, the sensor comes to a unit state. This gives permission to turn on the jet pump 11 by means of an electrically controlled valve 20. The jet pump creates the vacuum required to transport the sample in the filling circuit in the part in which the measuring cell is located. A sample is drawn into the pump together with air from the pump outlet to the inlet 12 of the receiving unit 7 for air separation. In the latter, the air is separated from the sample in the same way as it was during the transport of the sample. Circulation of the sample in the circuit is carried out until analysis of the sample in the cell 10 of the spectrometer is completed. In the described system, the full volume obtained is subjected to rapid analysis, and it is repeatedly pumped through the cuvette of the spectrometer, which increases the reliability of the control. Whi

For any reason, the sample volume is less than the permissible level, air bubbles start to pass through the cuvette of the spectrometer and, therefore, they pass through sensor 9. The latter goes into the zero state, and the computer complex turns off the pump 11. This excludes the delivery of an unreliable analysis result to the consumer. . The cuvette 10 of the spectrometer is spatially located at the highest point of the circulation loop. This was done to ensure that when the film of the spectrometer cell window was broken, the sample flowed down from the cell to the complete release of the contour.

After completion of the analysis, the discharge valve 13 opens with a spectrometer and the sample from the tank enters the shaper 16, which separates some parts from the sample to form a daily weighed daily and replaceable OTK samples. The separation is carried out on a cone divider, the upper part of which is the cone of the relief valve, which in this case is in the lower (initial) state. The lower part of the core of the imager may be fixed (static division) or rotate (dynamic shaping). The latter is preferable. The allocated parts of the daily and exchangeable samples are fed to the device 17 of the Quality Control Department. Thereafter, water is supplied to the tank by means of an electrically controlled IS valve to flush the circulation circuit and the former.

Claims (2)

Invention Formula The system of analytical control of liquid hpob, containing a photobatcher, accumulator-, -sh CmaivS  I 1 - t s4365536 sampling unit and air extraction unit for pneumatic sample transport, connected by a transport line, a sample former, a circulation loop including a spectrometer with a flow cell, a pump and a reset valve, and a computational complex characterized in that the purpose of simplifying the system, increasing the sensitivity of samples and 10 of the system operation reliability, the receiving unit of the pneumotransport air separation 1FOB is equipped with a tank rigidly connected to it and is located above the sample former, the dump valve is made in the form of a cone, equipped 15 a pipe for supplying compressed air and is located between the tank and the sample for sample flow, the flow cell is located at the highest point of the circulation circuit, and the system is equipped with a sensor for controlling the flow of the fluid through the flow cell located between the tank and the flow cell; one input of the control computing complex. 2j Sources of information admittedly when exported 1, N. Karpenko. Comparative data on subsystems of selection, delivery, and preparation of pulp samples for analysis in a stream. Ore Beneficiation, 1977 N 3, p. 38-40. 2. UV Report VNIKI Tsvetmetavtomatika on research, inv. N 673301 Poteme Development and implementation of sampling and sampling systems for the analysis of pulp in the stream at concentrating plants of the MCM, cipher 18-76-071, section 4, p. 13, 17 (prototype). in teifmffjt ifu Mrs Y-UP ffif ffofft /, ffa ffffiffff7ffe // ye / fffffg ff7 / f