SU929152A1 - Apparatus for automatic control of pulp preparation process - Google Patents

Description

(54) DEVICE FOR AUTOMATIC REGULATION OF PULSE PREPARATION PROCESS

one

The invention relates to process devices for carrying out various physicomechanical processes, for example, to obtain pulp with a given density in tanks with increased volume, and can be used in metallurgy, construction and other fields.

The closest to the invention in technical essence and the achieved result is an automatic control device in the process of pulp preparation by changing the supply of the liquid component of the pulp depending on the density.

With automatic regulation of the pulp density, for example, at the classifier drain, a pulp density sensor supplied to the reprocessing with it is installed, and according to its indications, water is supplied to the tank with a stirrer, the water being supplied by means of a water supply pipe with a control valve located at the top of the tank. In this way, water is supplied to the tank from above. The quality of regulation is satisfactory with

tank volumes not exceeding 1 - 2 мз 1

The disadvantage of the device is that a satisfactory quality of regulation of a given pulp density is possible only with a uniform flow of materials to the inlet of the grinding units and with relatively small volumes of tanks, which receive the plums with the ground product. It is often impossible to withstand this in practice, especially when

10, when the productivity of technological conversions adjacent to the pulp preparation operation varies dramatically, which negatively affects the quality of pulp preparation with specified

15 parameters on the content of the solid component. The use of known auto-adjusting devices on intermediate tanks of 1.5-2 m is inefficient due to private overflows and emptying,

2Q associated with large fluctuations in the arrival and consumption of transported pulp flows.

To get rid of irrecoverable losses and the associated safety violations create damping

tanks with an increased volume of about 30 m or more. However, in this case, it becomes difficult to select from large pulp containers with a given technology density due to the large conveyor and capacitive delay described by the equation T, where T is the delay time; V is the volume of the tank, F is the flow in.

The known device, which regulates the pulp production process with a given density, does not work satisfactorily due to the large inertia of the mixing of the pulp components in containers of the indicated volume.

The purpose of the invention is to improve the quality of the pulp.

The goal is achieved by the fact that the device contains a tank with a stirrer connected to a water pipe with a control valve, a slurry pipe and a suction nozzle, and a pulp density sensor is installed in the suction pipe, the output of which is connected to the first input of the regulator, the second input of which is connected to the unit and the output is controlled by a control valve in the water supply system; the water supply system is installed

inside the tank at the junction of the suction inlet with the tank and provided with a nozzle with alternating straight and curved tubes.

With the help of a water supply nozzle with a nozzle, which is buried in the volume, is a set of tubes with a diameter of 0.1-0.2 of the diameter of the water supply nozzle, it is possible to instantly influence the density of the slurry pumped to the required value.

Due to the counter-flow of water flowing out of the long tubes bent to meet them and long, the pulp volume in front of the pump suction nozzle (Vp) is diluted more rapidly and evenly with water. And since the diluted volume of the pulp is immediately pumped out by the pump, this significantly reduces the lag time of the control system, reducing it to 1-4 seconds on large volumes of tanks and thereby obtaining normal conditions for the operation of commercially available electronic controllers without the need the creation of intermediate low-volume tanks with a capacity of 1.3–3 m, designed exclusively for the pulp preparation of a given density according to the technology, the presence of which is inexpedient due to reasonable th continuity, reliability and production efficiency.

FIG. 1 shows the scheme of the proposed device for automatic control of the pulp preparation process; in fig. 2 shows section A-A in FIG. 1. The device contains a tank with a stirrer 1 located above the tank, a slurry pipe 2, which supplies pulp from a grinding unit with a density J, a pump 3, a suction nozzle 4, a water nozzle 5 with a nozzle 6,

in contact with the end of the suction inlet of the pump, pulp density sensors 7, measuring the density of the pulp entering reactors 8 of the subsequent processing, electronic controller 9 with unit 10, actuator 11, regulator 12, valves 13 located in the forward and reverse branches x slurry pipe 14.

The device works as follows.

In a tank with a stirrer 1 with a volume of 32 m or more, pulp is fed from a grinding unit, the density of which varies in the range where Dpt is 1.15 g / cm. Pump 3 with the help of a suction pipe 4 and slurry pipe 14 transports

the pulp in the reactor 8 subsequent processing, the density of which is monitored by the density sensor 7, the signal which is fed to the input of the electronic controller 9, the input of which also receives a signal from the setting device 10. If the signal from the density sensor is larger than the setting signal from the setting device () of torus 9, a signal is generated which, by means of an actuator 11, controls the position of the regulator 12 to such a position when

where the regulating action of water, carried out with the aid of the power supply nozzle 5 and the nozzle 6, will reduce the imbalance signal to zero.

The use of the present invention will stabilize the density

the pulp supplied to the acid leaching redistribution, and by maintaining the optimum acidity of the pulp at the outlet by acting on the acid consumption, ensure maximum extraction of vanadium from the raw material. This will allow, without additional investment, associated with the need to build intermediate mixers, reduce losses associated with fluctuations in pulp density, increase extraction of vanadium pentoxide from solutions and reduce losses with slimes.

Claims (1)

Invention Formula A device for automatically regulating the pulp preparation process, comprising: a tank with an agitator connected to a water main with a control valve, a pulp line and a suction inlet, and a pulp density sensor is installed in the suction nozzle, the output of which is connected to the first input of the regulator; the second input of which is connected to the setting device, and the output to the control drive of the control valve in the water supply system, characterized in that, in order to improve the quality of the pulp, the water supply system is installed Pulp inside the tank at the junction of the suction inlet with the tank and provided with a nozzle with alternating straight and curved tubes. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 345933, cl. On 01 D 21/02, 1970. Phi2.2