SU1271830A1 - Method for automatic control of water treatment process - Google Patents

Abstract

The invention relates to methods for automatically controlling the process of water purification, can be used in water treatment and can improve the quality of cleaning and reduce the consumption of coagulant. The method is implemented by an automatic control system (ACS) that connects the coagulum flow control loop depending on the total flow of clarified water with correction by the maximum rate of change of the average value of the differential pressure (water flow sensor 3, controller 1 ,,,. 1 splicing mechanism 2 and the corrective unit: differential pressure gauge 7, sensor 6, differential (L 5, and extreme regulator 4). 1 ill. To about

Description

The invention relates to methods for automatically controlling the process of water purification, including dosing of the coagulant in water and its subsequent filtration on fast 5 filters.

The aim of the invention is to improve the quality of cleaning and saving reagent.

The quality of the filter is controlled by the speed at which the filter becomes clogged with suspensions contained in water, i.e. by the rate of pressure loss in the filter (slew rate of hydraulic resistance of the load 15).

At a constant flow rate of water through the filters, the filtration process is considered optimal for acrsr-Hmpks, dt 'where jp _CP is the average pressure drop (pressure loss) at the filter load,

The drawing shows a diagram of the implementation of the proposed method.

The method is as follows.

The dosage of the coagulant is made by the regulator 1, acting 30 on the actuator 2 by a signal proportional to the total flow rate of the clarified water, measured by the sensor 3.

The proportionality coefficient 35 of the controller 1 is adjusted by the extreme controller 4 so that it searches for the maximum dUpcp). .

derivative --- calculated diffSST 40 by the referent 5.

• The differential pressure 5 is supplied with the average value of the pressure drops (pressure loss) for all η working filters of the installation, calculated 45 in block 6, to which the signals from differential pressure gauges 7 "The average value of the pressure drops. Pressure is calculated by the formula ^g de pj - differential filter loading pressure;

1,2, .. ,, l, η is the number of included filters.

Starting with a certain minimum dose, the coagulant's output increases with each clock pulse until a tick inequality persists) ^{7 /} ^>

where i? _tv c _Ti and a Ρ _τακΤη _, the difference between the hydraulic resistance of the load at the end and at the beginning of the cycles η and (p-1); £ - error of regulation.

As long as an increase in the dose of the reagent leads to an increase in the sedimentation rate of the suspension, the amount of coagulant supplied increases. When this speed stops increasing or even begins to decrease, i.e. for (nP _takTp -δΡ _τοκτ) έ £ and especially in the case of (ΑΡ _τακτ ^ '• ^ P-din _{n_} best mode search continues in downward flow of coagulant, then when the sign of the difference varies on the positive feed back is increased, and so on. d.

Claims (1)

Claim A method of automatically controlling the water treatment process, including coagulation and subsequent filtration, by dosing the coagulant in proportion to the total flow rate of the clarified water and measuring the pressure drop across each filter, so that in order to improve the quality of treatment and reagent economy, additionally determine the average value of the differential pressure across the filters, its rate of change and adjust the coagulant dose according to the maximum value of the rate of change of the average differential pressure Nia. / Editor G. Volkova Compiled by A. Popov Tehred in 'Kadar' Corrector M. Maximishinets Order 6305/23 Tirade 864 Subscription VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushskaya nab., D. 4/5 Production and printing company, Uzhhorod, st., Project, 4