SU1247342A1 - Automatic control device for process of treating tar water in ammonia column - Google Patents

Description

I

The invention relates to devices for the automatic control of technological processes in mass exchange apparatuses, for example, the processing of over-resin water in an ammonia column, and can be used in coke, chemical, petrochemical and other industries in the automation of distillation processes, including benzene dis tilting columns. ;

The aim of the invention is to reduce the consumption of steam and the volume of wastewater by increasing the quality of controlling the temperature of ammonia vapors and the pH value of the wastewater.

The drawing shows a block diagram of this device.

The device contains regulator 1 and sensor 2 for separate water flow, valve 3 and pipeline 4 for supplying seawater water, ammonia column 5, controller 6 and sensor 7 for temperature of ammonia vapors, pipe 8 for output of ammonia vapors, accumulator 9, sensor 10 and regulator torus 11 of the flow of high-resin water, valve 12 and pipeline 13 for the delivery of over-resin water,. Ratio unit 14, sensor 15 and steam flow controller 16, valve 17 and steam supply line 18, computing unit 19, separate water and steam temperature sensors 20 and 21, controller 22 and wastewater pH sensor 23 and waste water outlet line 24 .

As regulators 1, 6, 11, 16 and 22, regulating devices serially manufactured by industry can be used.

As an adder 9 and a block 14, the ratios can be used computational operations blocks (functional blocks) serially executed by the industry.

As a computational unit 19, a computational unit of a known device projected on standard elements, for example, elements of the Start system, can be used.

The device works as follows.

With given temperatures of ammonia vapors, the total flow rate of the processed supra-resin and separator waters and the pH value,

waste water, as well as at average temperatures of separator water and steam, at which the control circuits are adjusted, all three local systems of automatic control are balanced.

When, for example, the temperature of ammonia vapors deviates from a predetermined value, the controller 6 detects a correction signal to the controller 1, which, acting on the valve 3, establishes such a flow of separator water at which the temperature of the ammonia vapors becomes equal to that value.

At the same time a new flow of separator water is established. From the sensor 2 flow to the input of the adder 9 receives the modified signal. - Totalizer 9

0 algebraically adds the signals from sensors 10 and 2 of the flow of chapsol and separator water and generates a modified signal to the controller 11, which, acting on valve 12, establishes. Such a flow of over-resin water, at which the total flow of over-resin and separator water takes a predetermined value.

Thus, changes in consumption

(3 separator water caused by a change in the temperature of ammonia vapors does not lead to changes in steam consumption and, therefore, does not cause a change in the pH value of the waste water.

5 - G When the deviation of the pH value of waste

water from a predetermined value, the regulator 22 generates a correction signal to the regulator 16, which, acting on the valve 17, sets a vapor flow rate at which the pH value of the waste water takes the predetermined value.

When the temperature of the steam deviates

5 or separator water temperatures from average values, the computing unit 19 extracts the signal in accordance with the following equation of communication:

 ..i

(one)

the ratio of the steam consumption and the total flow rate of the over-resin and separator waters in the column;

determinants determined by

experimentally for the specific conditions of the object;

X is the temperature of steam and separator water.

The implementation of the equation of communication (1) with the help of a computing unit 19 provides static invariance of the regulated value (the ratio of steam consumption and total consumption of supersmoral and separator water) with respect to the disturbing influences of the input process variables (temperature of steam and separator water).

The output signal of the computational unit 19 outputs the correction signal to the ratio unit 14 and the controller 1. The ratio unit 14 generates a signal to the controller 16, which, acting on the valve 17, sets the steam flow corresponding to the changed values of the input process values.

At the same time, the computing unit 19 corrects the task to the controller 1, which sets the separator water flow corresponding to the changed steam flow at which the ammonia vapor temperature remains unchanged (set).

Thus, changes in the pH of the wastewater do not cause fluctuations in the temperature of ammonia batteries.

This device for automatic control of the process of processing of the resin in ammonia

column in comparison with the famous

provides simultaneously the maintenance of the specified values of the temperature of ammonia vapors and the pH of the waste water and an increase in the quality of regulation.

The use of the proposed device contributes to saving steam consumption for the processing of supra-resin water, reducing the volume of wastewater and, consequently, reducing the cost of processing wastewater, as well as improving the quality of the finished product (ammonium sulfate).

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Compiled by G.Ogadzhanov Editor L.Povkhan Tekhred-N.Bonkalo Corrector L.Pilipenko

Order 4072/22 Circulation 450 Subscription

VNISh State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

DEVICE FOR AUTOMATIC CONTROL OF THE PROCESS OF SUMMARY WATER IN AN AMMONIUM COLUMN, containing a sensor and a regulator for separate water flow connected in series, the output of which is · connected to a separate water supply valve, an ammonia vapor temperature sensor, a wastewater pH sensor, and a steam flow regulator with a steam supply valve, flow sensors for tar and water, a steam temperature sensor connected to the first input of the computing unit, characterized in that, in order to reduce consumption the volume and volume of wastewater by improving the quality of regulation of the temperature of ammonia vapors and the pH of the wastewater, it additionally contains a separate temperature sensor, a ratio unit, an adder, a tar flow regulator, a tar water supply valve, pH and ammonia vapor temperature regulators, while the ammonia vapor temperature sensor is connected through its regulator to the second input of the separate water flow regulator connected to its output by the third input to the output of the computing unit, the pH sensor through its regulator the torus is connected to the first input of the steam flow controller, connected by its second input to the output of the ratio unit, the separate water temperature sensor is connected to the second input of the computing unit, the output of which is also connected in parallel with the first input of the ratio unit connected by its second input to the steam flow sensor, and the third input is to the output of the adder, the flow sensor of the tar water is connected to the first input of the adder, the second input of which is connected to the flow sensor of separate water. Nd M ss 4 ^ ND