SU715648A1 - Device for automatic control of series of electrolytic bathes - Google Patents

Description

(54) DEVICE FOR AUTOMATIC CONTROL OF A SERIES OF ELECTROLYTIC BATHS

. The invention relates to electrolytic production, which is characterized by large numbers of the same type of apparatus, combined by current load and technological supply (for example, the production of chlorine and Caustic soda by the method of mercury electrolysis). The known scheme of automatic regulation of the water supply in the decomposition, or of the amalgam at the signal of the AN 1. The disadvantage of the scheme excludes: individual adjustment of the supply in the drive and the brine to individual decomposers and electrolytic baths depending on the individual disturbances of the individual apparatuses. a device that implements a method of controlling a series of electrolytic baths, used in electrolytic production facilities, which are cracked by a large number of similar devices, united by Current load and process power 2. The known device contains sensors for volume flow and concentration of caustic soda, installed on the output of the control tank and connected to the control panel, flow sensors of purified water, and flow rate of brine, located on the control bath and connected to the control panel, current load sensors, concentrations, brine temperature, caustic soda concentration and sensors of the number of working baths, connected to the control panel, the executive body of the flow of purified water and the executive body of the total consumption sol connected to one of the control panel outputs. The disadvantages are that the device does not allow to take into account the mode and technical characteristics of each decomposers and each electrolytic bath during electrolysis. In addition, determination of the performance of a series of baths and the impact on the total consumption of purified water and brine on all baths is made by one control bath, this bath can be provided with a graphite nozzle in a decomposer in good condition and a sufficient amount of mercury or with a graphite nozzle Degraded in poor condition and low in mercury. When affecting the total consumption of purified water and brine in terms of the performance of the control bath with short characteristics, the concentration of caustic soda at the outlet of the part of the baths with the worst characteristics will be lower than acceptable, which will entail additional losses when the caustic soda concentration is brought to the required level.

  . .

If a series of baths are controlled by a control bath with poor characteristics, for a part of the baths with good characteristics, the flow of water to decomposers will be insufficient, which will lead to caustic soda concentrations .. above their tolerance, resulting in a possible crystallization of the water, In the process crystallization part of the graphite nozzle becomes inoperable, which will lead to a decrease in the performance of the baths, as well as possible disruption of the circulation of mercury due to the seizure of part of the amalgam crystal s kaustichesk.oy soda, which will increase the hydrogen content in chlorine. ... -.

The structure of the pores of the graph breaks down under periodic allysation and dissolution of alkali, as a result of which caustic soda solution is contaminated with graphite dust, which leads to a decrease in its quality.

The purpose of the invention is to increase the productivity of the series of baths and improve the quality of the output products.

This is achieved in that the device additionally: but contains a caustic soda concentration unit, an averaging unit for volume flow, an averaging unit for purified water and an averaging unit for brine, while the outputs of the averaging units are connected to the control unit, and the inputs for the averaging unit for caustic soda - with outputs of Caustic soda concentration Sensors, inputs of the averaging unit of the volumetric flow rate are connected with the outputs of the sensors of the volumetric flow rate of the water, inputs of the averaging unit of the flow-, or yes purified water - with the outputs of the sensor. of purified water, and the inputs of the brine averaging unit with the outputs of the brine flow sensors,

The block diagram of the proposed device is shown in the drawing,

 The device includes a group of control electrolyzers 1 and decomposers 2 connected to volume flow sensors and concentration-caustic soda sensors 4, You output the volume flow rate sensor 3 connected to the volume flow average averaging unit 5, and the output from the concentration sensor caustic soda ..4 with averaging unit

caustic soda 6; the outputs from the averaging blocks 5 and b are connected to the control panel 7. To the inputs of the control panel connect the averaging blocks of purified water 8 and the averaging flow-brine 9. The input of the decomposer 2 is connected to one of the outputs. the sensor flow of purified water 10, the output of which is connected to the averaging unit flow of purified water 8; the input of the electrolyzer 1 is connected to one of the outputs of the brine sensor 11, the output of which is connected to the brine consumption averaging unit 9.

The control panel 7 is connected to the sensor and current load 12, the concentration of brine 13, the temperature of brine 14, the concentration of caustic soda at the outlet of the common collector 15, the number of operating baths 16, with the executive bodies of the total flow of purified water 17 and the total flow of brine 18 ..

The process of producing chlorine and caustic soda is carried out in an installation containing a series of electrolyzers 1 and a.subsidants 2.

From a series of electrolytic baths.

 Several control alarms are allocated, at the output of which sensors of volumetric water flow 3 and sensor and caustic soda concentration sensors 4 are installed. From them. the signals are sent to the averaging unit, the volume flow rate of water 5 and the averaging unit of caustic soda concentration b, after which information about the average values of the volume flowrate and water concentration of the caustic soda in the control baths goes to control bullets 7,.

This information is used to control the total flow of purified water and brine with control of the value of THIS control effects by the average consumption of purified water and the flow of brine on the control baths received from the averaging unit of the flow rate of full water 8. and the averaging unit brine 9 flow rate as a result of the averaged 13 | I signals coming from the purified water flow sensors, 10 and the brine flow sensors 11 installed on each control.

. bathtub. ..

The control panel 7 receives information from the sensors of current load 12, brine concentration 13, brine temperature 14, concentration ka; oral. soda outlet, common collector 15, the number of operating baths 16..

After analyzing information about all

Claims (2)

perturbations acting on the bath series and on the average weight output of caustic soda in several control baths, depending on the average values of the volumetric water flow and the concentration of caustic soda, are made by the executive organ of the total flow rate of purified water 17 and the total flow of brine 18; these control actions are controlled by the average flow rates of purified water and brine on the console baths, which ensures the maximum mode of the electrolysis process of the bath series by the performance of caustic soda and improves the quality of Xra and caustic soda. The proposed device provides a performance enhancement to the bath series; Improving the quality of the output products, as well as improving the quality of the process. The invention of the device for automatic control of a series of electrolytic baths, containing sensors for volumetric water flow and caustic soda concentration, installed at the outlet of the control bath and connected to the control panel, sensors for the flow of purified water and brine flow, located on the control bath and connected to the control panels, Current load sensors, concentration, brine temperature, caustic soda concentration and the number of working baths sensors connected to the control panel are used The purified consumption flow organ and the executive agent of the total brine flow, connected to one of the control panel outlets, characterized in that, in order to increase the performance of the bath series and improve the quality of the output products, it also contains a caustic soda concentration averaging unit, a volume averaging unit water flow, averaging unit flow of purified water and averaging unit flow rate of brine, while the outputs of these averaging blocks are connected to the control panel, and the inputs of the block are averaged Seda caustic concentration - to the outputs of the sensors caustic soda concentration, inputs averaging unit water volume flow coupled to the outputs of the volumetric flow sensor inputs block averaging flow of treated water - in yields of purified water sensors, and the inputs of the averaging flow distribution. Sol - with codes for brine flow sensors. . Sources of information taken into account in the examination 1.Lomakin I.L. Avts 1atizatsiya khlbrnyh productions, Himi, 1967, p. 147. 2. USSR author's certificate number 412930, cl. From 25 to 15/02,15.02.74.