SU1050725A1 - Apparatus for automatic control of suspension filtering process on periodic-action filter - Google Patents

Abstract

A DEVICE FOR AUTOMATIC CONTROL OF THE FILTERING SUSPENSION FILTER ON A PERIODIC FILTER FILTER, containing a series-connected nonlinearity unit, a multiplication unit, an adder, a zero relay and a stop unit, and an integrator, the output connected to the multiplication unit, which is connected to a program that is connected to a program that stops the program and stops the unit; operation of the device, it is equipped with a pressure sensor mounted on the filter and connected to the inputs of the integrator and the zero relay, while the output of the nonlinearity unit is connected to the adder. (L

Description

The invention relates to devices for automatically controlling the process of filtering suspensions in the chemical and other industries.

A device for automatically controlling the filtering process of suspensions on a batch filter, comprising series-connected non-linearity blocks, a multiplication unit, an adder, a zero relay and a stop unit, as well as an integrator whose output is connected to a multiplication unit £ 1].

A disadvantage of the known device is the need to use a flow meter that does not work reliably, in most cases it is absent on the filters, especially when their number in the filter compartment is large, which hinders the introduction of automatic filtering process control devices on periodic filters.

The purpose of the invention is to increase the reliability of the device.

This goal is achieved in that the device for automatically controlling the process of filtering suspensions on a batch filter, containing a series-connected non-linearity unit, a multiplication unit, an adder, a zero relay and a stop unit, as well as an integrator, the output of which is connected to the multiplication unit, is equipped with a pressure sensor, mounted on the filter and connected to the relay,

The input of the integrator and the zero at the same time, the output of the block is non-connected to the adder.

the drawing shows the structural proposed device.

The device contains a pressure sensor 1 mounted on the filter 2 and designed to measure the pressure in it, an integrator 3, a nonlinearity block 4, a multiplication block 5, an adder 6, a zero relay 7 and a stop block 8.

> The device operates as follows;

The suspension on the filter 2 is fed by a centrifugal pump, the characteristic of which is of direct form is expressed by the equation

Tde p = Ap - k _o v, _ (1)

- current filtration performance, m ⁵ / h,

VNIIIPI Order 8530/8

Arik - straight line equation parameters.

At the beginning of filtration, when the filtration resistance is negligible, the pressure in the filter 2 is small. However, during the filtering process, the resistance increases, which leads to an increase in pressure in the filter 2 and to a decrease in performance.

Filter 2 reaches a maximum average productivity per cycle when the condition is satisfied

V (2) f 1 Λ ^{G + ν} β where J vdι is the filtrate volume, the ⁰ obtained during the filtering time ^Λ L ^NII , οθ is the time of auxiliary operations.

& Rr

From equation (1) V = —rr ~ is found, and substituting into equation (2) and making simplifications, we obtain kl, ΐ «-ίβ (3)

those. the condition for achieving maximum average productivity.

The pressure sensor 1 measures the current pressure in the filter ^ 2, the integrator 3 gives the value Jp <K and at the same time the nonlinearity block 4 gives the values

Bp «9 τ ^and . t + tp

Block 5 multiplication multiplies the values

Г * j р « ^and tag and transfers them to adder b, which determines the sum and transfers its value to zero relay 7, comparing it with the value of the current pressure. When the difference is equal to zero the compared values to zero switch 7 includes a stop block 8, the signal at the end of filtering operation and holding vopomogatel- _(operation times.

The use of the proposed device will improve the reliability of its operation in the automation of filter compartments.

Circulation 688 Subscription

Branch of PPP Patent, Uzhgorod, Project 4,

Claims (1)

A DEVICE FOR AUTOMATIC CONTROL OF A SUSPENSION FILTER ON A PERIODIC ACTION FILTER, containing a series-connected non-linearity unit, a multiplication unit, an adder, a zero relay and a stop unit, as well as an integrator, the output of which is connected to the multiplication unit, characterized in that the reliability of the device, it is equipped with a pressure sensor mounted on the filter and connected to the inputs of the integrator and the zero relay, while the output of the nonlinearity block is connected to the adder. Yul> Yu sl ^: 1050725