SU991231A1 - Production flow analytical checking system - Google Patents

Description

(54) SYSTEM OF ANALYTICAL CONTROL OF TECHNOLOGICAL FLOWS

The invention relates to the analysis by physical methods of the material composition of slurries, solutions or suspensions directly in the stream and can be used in ore-processing industries when creating automated process control systems. A system of analytical control of liquid samples is known, containing an rtpo6o sampler, a collection block of samples and a receiver unit for pneumatic conveying separation - samples connected by a transport main, a former, a circulating ion circuit including a spectrometer device with a flow cell, a pump and a dump valve, and a control computing unit , to one of the inputs of which the sensor for monitoring the non-continuous sample passage through the flow cell is connected. 1 The disadvantage of this system is the inability complex analysis zhitsky samples. A known system for determining the composition of the pulp directly in the stream, contains an X-ray analyzer, controls the electron-computing machine and the subsystem for the selection, delivery and preparation of samples for analysis, which for each controlled flow includes a primary sampler that continuously takes a part of the technological sample. flow (2OO l / min), two-inch Dentrictive sand pump for pumping the sample to the analv place, the secondary sampler is installed, through which the sample is reduced to 2 pp / mt, clearing from constant jpokHnx insertions and continuously pumped through the measuring cell of the revt gene analyzer | 2 The disadvantage of such a system is that too much flow is diverted to the sample (the flow rate is often comparable to the flow rate of the flow to be controlled), as well as the complexity of the system and the low accuracy of the analysis. SQ The closest in technical essence to the invention is the system of analytical control of process flows, containing a sampler, a unit connected sequentially to a transport line; accumulation and dispatch of samples, an air treatment unit, connected by an outlet to an acne} gnuum filter, a solid pulp analysis unit, consisting of an x-ray analyzer, a pulp flow device and a valve relief unit mounted at the inlet of the receiving funnel , devices for the formation of balance samples, at the entrance of each of which is placed the flow divider associated with the block MI (pulp production, computational complex connected to the X-ray analyzer and to the shut-off elements installed on the supply lines of the components, and the drainage pipe Gz1. A disadvantage of the known system is the considerable inconsistency of the analysis results, due to the fact that the sample in the accumulation and dispatch unit is diluted with an eddy ratio of uncertainty. The system does not provide the specified quality of decontamination of balance samples and complex research of samples, which reduces the efficiency of the entire system. The purpose of the invention is to increase the efficiency of the system by improving the reliability of the results. This goal is achieved. We have achieved that the system is equipped with a pulp level sensor in the sample accumulation unit connected to the corresponding input and output of the computing complex, switching devices, | one of which is installed at the outlet of the cleaning filter, and is connected to the drainage1 | by the pipeline and with the device for the pulp movement of the pulp analysis unit of the solid phase of the pulp, the filtrate analysis unit consisting of another measuring cell of the X-ray analyzer connected by a circulation loop to the output of the devices forming the balance of the samples, the inputs of which are connected alternately through the second switching device to the output pulp receiving funnel; Moreover, the pulp dehydration sideways, the device for forming balance samples are made in the form of sealed containers, each of which is connected to output 14 is a flow divider through a check valve and is connected to the compressed air supply line through an adjustable valve, the control input of which is connected to the corresponding output of the computer complex. The drawing shows a block diagram of the system of analytical control of process flows. The system consists of a slotted discrete sampler mounted on the difference of the monitored flow 1. The output of the sampling element 2 of the sampling probe is periodically set in motion by the actuator 3, resulting in the intersection of the controlled flow 1. The flexible sampling hose is connected to the reservoir through the check valve 4 5 of the accumulation and dispatch unit, which for the period of dispatch is connected to the highway; compressed air with the help of electrically controlled valve 6. At other times, valve 6 blocks access of compressed air and connects the internal volume of tank 5 with the atmosphere. A level sensor 7 is installed in the storage unit, for example, a conductometric sensor is used. The water is supplied to the tank 5 through an electrically controlled valve 8. The pulp enters the receiving unit 10, which is connected to the ventilation network 11, and has a drain inlet in the lower part. The air separation unit is equipped with several inputs for connecting transport lines from various control points. Under the air separation unit 10, a cleaning filter is installed, including a removable grid 12 made in a vice cone installed in the funnel 13. The first switching device is located directly below the cleaning filter, the chute 14 of which with the help of the actuator 15 can tilt to the side of the receiving funnel of the unit analysis of the solid phase 16 pulp or in the direction of the drainage pipeline 17. The pulp solid phase analysis unit 16 consists of an X-ray analyzer 19 connected to the circulation circuit of the first measuring cell 18, a pressure displacement / pulp device 20, and a pulp discharge valve unit 21 triggered by an electric actuator 22 and discharged the pulp into a receiving funnel 23.

The circulation of this circulation circuit is carried out with a pitch that flows through an electrically controlled valve 5 24,

At the outlet of the receiving funnel 23, a second switching device 25 is installed, which by means of the drive 26 directs the pulp flow to one of the methods of forming balance samples (according to the number of controlled flows), each of which includes a flow divider 27 connected via check valves 28 sec. dewatering units 15 of the pulp 29, to the inlet of which the Z-O compressed air supply line with adjustable valves 31 mounted on it is connected.

Under the dewatering units 29, the funnels 32 are located to receive the filtrate. The feedings of the funnels of one section are connected by pipeline to the return from the entrances of the pressure displacement device 33 of the filtrate into the filtrate analysis unit, which includes the second measuring cell 34 and the vent valve 35,. connected to the circulation circuit.

Computing complex 36 is connected by a trunk line with a peHiw gene analyzer 19, a level sensor 7, electrically controlled valves, sampling actuators {nikikov of switching devices, 35 pulp discharge devices, and devices for displacing the filtrate and filtrate,

A sand pump of a centrifugal or gas-jet type 40 is used as a device 2O for the pressure movement of the pulp.

The pulp dewatering unit 29 is a cylinder with a lid on which a check valve 28 and a nozzle for connection to the compressed air line 30 45 are fixed. Adjustable valve 31, Number of dewatering units

--- r - rj pulps is determined by the nomenclature of the formed samples. By means of a detachable connection, the cylinder is fixed on the table. In the lower part of the cylinder there is a mesh, filter cloth or filter paper.

The system works as follows .55

According to the signal from computer complex 36, the actuator 3 of the sampler is turned on and the sampling element 2 is moved at a constant speed from one extreme position to another, intersected by the test stream. At the same time, a part of the process stream is withdrawn into the sample through the entrance slit of the sampling element 2. A private sample, taken at one flow intersection, flows through a flexible hose through a check valve 4 to the receiving tank 5 of the accumulation and sending unit, in which from two to ten private samples (depending on the specified conditions) taken in one cycle of the system (usually DZ min) are combined into one averaged sample. The number of private samples taken during the cycle depends on the rate of change of the monitored parameters of the test stream and is determined by the system setting,

The pulp sample is connected to the analysis site via the transport line 9 using compressed air supplied through an electrically controlled valve 6, which is triggered by a signal from the computing complex 36. For the time of sample transport, the accumulation and dispatch unit is disconnected from the sampler by a check valve 4.

The volume of the pulp sample is measured before it is sent with a level sensor; 7, the signal from which is fed to and stored in the operative memory of the computing complex 36 for further processing.

If necessary, the sample can be brought up in tank 5 to a predetermined volume by diluting it with water supplied through an electrically controlled valve 8, which is opened and closed also by signals from the 3j6 computer complex. The water supply is stopped at a predetermined value of the signal from the level sensor 7, and the transport line and the accumulation unit are washed with a high water signal after the completion of the sample cracking.

Claims (1)

1. The author of the Soviet Union .3. Kozin, VG, et al. Automation N 836553, class O1M 1 / 1O, 1979. The processes of the central and eastern processes at the enrichment 2. Description of the X-ray factory system. M., Lieapa, 1980, Rali analysis of bullets in the Courier stream-s. 282-284. IT TT emmumir NHBIf Cfl4 9m iteiimttMiPen nemav