SU1357717A1 - Method of controlling operation of evaporating basin - Google Patents

Abstract

The invention relates to controlling the process of obtaining potassium chloride using pooling technology and can be used in the mineral fertilizer industry. The aim of the invention is to stabilize the composition of the discharge solution. Devices (P) 3-5 determine the level and temperature of the solution in pool 1 and the content of KC1 in the solution at the entrance to the last pool card, P 6-8 measure the costs of the initial solution, the solution supplied to the last map of the pool, and the discharge solution . Signals from P 3-8 are fed to computing device 9, the output of which is connected to actuators 11-13, controlling the operation of valves 14-16 installed on the supply lines of the initial solution, supplying the solution to the last map of the basin and unloading the solution from the pool. 1 W1. c & (/) ncfaS- Jr PK Hh / Ct pacri76l fl 00 JV -vl KOfieVfft U faf / nfcfl

Description

11357717

The invention relates to the automatic control of technological processes for the production of potash and benignities, in particular, to the process of obtaining potassium chloride by the method of joint technology, and it can be. Used in the mineral fertilizer industry.

The purpose of the invention is to stabilize the composition of the discharging solution.

The drawing shows the implementation of the proposed method.

The initial solution is continuously fed into the evaporating basin 1. The solution concentrated on KC1 is periodically discharged from the last map of the two basins. The primary transducers, complete with secondary devices - .20 and 3-5, determine the level of the solution in the pool, the temperature of the solution in the pool and the content of KC1 in the solution at the input of the last card, respectively. Primary converters in; 25 complete with secondary devices 6-8 measure the flow rates of the initial solution, the solution supplied to the bottom of the pool map, and the solution discharged from the pool, respectively. Signals from the devices 3-5 were placed into the computing device (WU) 9, which also receives a signal from the setter 10. The last is the value of the level of the solution in the pool in accordance with the requirements of the process regulations. The actuators 11–13 control the operation of the valves 14–16 on the supply lines for the initial solution, the solution in the last map, and the discharge of the solution from the pool, respectively.

The method is carried out as follows.

At a certain point in time, for example, 17 hours, WU 9 calculates the predicted solution temperature for 17 hours after the day according to the equation

35

45

One t, 17 signal which center basin basin). it will defeat it from time to time about the time to continue to answer day. To the load is over VU 9 p execute closing

Wu is significantly corrected in and equal

-five. .0.71t.; + 0.22t., + 0.07t., +

t-0,35ar- -0.35a.,, (1)

Fo Fon- iF,

(3)

where t-j ;, is the predictable maximum, for daily temperature

solution at time gg where F, is the consumption of the original solution,, C; served in the eve of the pool, tons / day.

 - solution temperature in After performing the calculation of the value

the time of prediction about, on the eve of F, control signal is fed from WU 9

0 5 o d where h

€ -1

five

not two days before the forecast, respectively, s; the forecast error of the maximum daily temperature on the day of the forecast and the day before, respectively, ° C. At the same time, at the time t, 17 h, the control unit receives a control signal to the actuator 13, which opens the valve 16 and the solution concentrated on KC1 is completely unloaded from the last map of the basin (the solution does not arrive in the last map of the basin from the last but one). The unloading of the solution from the last map of the basin occurs by gravity through the pipes through special discharge sumps. Depending on the amount of solution in the last pool map, the discharge continues for 1-, 5-2.5 hours. At the moment of time, for 17 hours, the source solution continues to flow evenly into the evaporating pool in accordance with the calculation of the previous day. By the time of G. h. The unloading of the last map of the basin is completed, at a time 2. 20 h. WU 9 is supplied with a control signal to the actuator 13, which closes the valve 16.

WU 9 in accordance with the measured value of the solution level in the evaporator. body pool (bf) calculates the correction of the flow rate of the initial solution in the evaporating pool (AF) according to

LF „(,„). (S-s, Xp, (2)

where h

d1 - the specified value of the solution level, m |

S, S, - respectively, the area of the evaporation pool and the last map of the evaporation pool, m;

p is the density of the solution, t / m.

The flow rate of the initial solution in the evaporative SO pool (F) is determined from the expression

Fo Fon- iF,

(3)

It drives an actuator 11 that moves the valve 14 and changes the flow rate of the original solution in accordance with the calculation.

The stock solution is fed evenly over the next day. pool. At the same time, in accordance with the measured value of the content of potassium chloride in the solution at the inlet

latest card evaporative bass-fO pa served in

with calculation.

Yna (S.,) and the predicted solution temperature (t--.,) WU 9 calculate the solution flow rate in the last mouth of the evaporative basin (Rd) to the equation

h 0.29 m to equation (2) of the flow rate of the initial sein LR -600 t / cy (3) the flow rate of the solution pool with the control blue mechanism 11, to the valve 14 and to change

f5

(4) calculates the last map of the base C, the control is sent to the executive rykhaet back to the last map the number of control signals 13, the engine 16, and the solution unloads the pool maps at 17 o'clock.

R o

S, (7.6 + 0.14tt +,

7.6 + 0, 14tp, + C,

where is f

cvr

- daily evaporation of water from the solution, t / m.Sut.

After the calculation of the Pd value is completed, the control signal from the WU 9 is sent to the actuator 12, which opens the valve 15 and delivers the calculated amount of the solution to the last pool card. The last pool card is loaded within 1.5-2 hours (depending on the calculated amount of solution Rd). After the last pool card has been loaded from WU 9, a control signal is supplied to the actuator 12, which closes the valve 15.

Example. Baseline: 8 6-10 m2; S, 10 m2; h ,, 3 m;

ESU 0.01 t / m2. Day; 17 h;

C-2 20

CK, Sc 21%; P, 2 t / mz.

1200 tons / day;

The eve had the actual temperature of the solution t 31 C, and its predicted value was 33 C, Then a, 2 ° C. Two days before the forecast, the actual temperature was: -, solution C. Let the predicted temperature value С, and actually - C. Then l C. ВУ 9 calculates nsho (1) t, 30 ° Co. Simultaneously

and on equal-g. -

the time that the control unit receives the control signal from the actuator 13, which opens the valve 16e and the solution concentrated in KC1 is discharged from the last basin map, by the time

time From 20 hours the card is finished, nor IT j devices 3

last unloading

Let at the time of time - and 5 showed the correspondences given in

with calculation.

H 0.29 m; C, 10%. WU 9 according to equation (2) calculates the correction of the flow rate of the initial solution in the pool LP -600 tons / day and according to equation (3) the flow rate of the solution supplied to the pool tons / day. With WU 9, a control signal is supplied to the actuator 11, which moves the valve 14 and changes the flow rate of the solution in accordance with WOO 9 according to the equation

f5

20

25 (4) calculates the flow rate of the solution in the last map of the basin P 852 tons / day. A control signal is supplied to the actuator 12, which opens the valve 15 and feeds the calculated amount of solution Pp to the last pool card. The next day, at 17 o'clock, the control signal from the control unit 9 comes to the actuating mechanism 13, which opens the valve 16, and the solution concentrated in KC1 is discharged from the last pool map.

25 h35

:

40

45

50

se

thirty

- The use of the proposed control method allows to stabilize the composition of the discharge solution in hydrochloric potassium.

Claims (1)

Invention Formula The method of controlling the operation of the evaporating pool in the process of obtaining potassium chloride, including controlling the flow rate of the initial solution to the evaporating pool, the solution to the last card-evaporating pool and the discharging solution, as well as measuring the level of the solution in the evaporating pool, in order to stabilize the composition of the discharge solution, additionally measure the temperature of the solution in the last map of the evaporative pool, the content of potassium chloride in the solution at the entrance to the last map According to the current and previous values of the solution temperature in the last map of the evaporative pool, the evaporative pool predicts the maximum daily temperature of the solution; the flow rate of the initial solution to the evaporative pool is proportional to the level of the solution in the evaporating bass. Seine, and the solution flow rate in the last map of the evaporative basin depending on the predicted potassium chloride in the solution at the input value of the maximum daily temperature of the solution in the last evaporating bass temperature and sein content.