CN116081231A - Automatic control method for product abundance in material flow material taking control mode - Google Patents

Abstract

The invention relates to the technical field of uranium isotope separation, in particular to a method for automatically controlling product abundance in a material flow material taking control mode, which comprises the following steps: step 1, setting a control signal; step 1.1, selecting a control time point; step 1.2, calculating the maximum deviation of abundance; step 1.3, setting control signals in a segmented mode; step 2, control signal feedback; step 3, calculating the material taking pressure adjustment quantity; step 3.1, calculating an instantaneous abundance target value; step 3.2, calculating a material taking target control pressure; and 4, controlling pressure adjustment by a regulator. The method for adjusting the abundance of the product has higher stability, reduces the pressure adjustment frequency and adjustment amplitude of the abundance in the receiving stage of the container, particularly in the early receiving stage, and ensures that the receiving process of the product is more stable.

Description

Automatic control method for product abundance in material flow material taking control mode

Technical Field

The invention relates to the technical field of uranium isotope separation, in particular to a method for automatically controlling product abundance in a material flow material taking control mode.

Background

At present, the production line supplies surplus material to the final stage of a concentrate end through backflow by controlling the material taking amount of a material flow so as to control the material taking mode of a product, the material taking ratio of the final stage is changed to realize the adjustment of the on-line instantaneous product abundance (hereinafter referred to as instantaneous abundance), so as to ensure that the average abundance (hereinafter referred to as bottled abundance) in a container reaches a product quality target, and the control of the product abundance in the mode mainly comprises the following steps:

in the first mode, the bottled abundance is not controlled in the early stage of material collection, and the material taking control pressure is greatly adjusted at one time in the later stage of material collection, so that the bottled abundance is pulled back to be within a control range. Although the method can reach the product quality target at the end of the container material collection, the larger the instantaneous abundance fluctuation range in the material collection process is, the larger the separation work loss in the container is.

And secondly, when the bottled abundance exceeds a set control range, the instantaneous abundance is gradually adjusted by taking 0.01kPa as a step length so as to pull the bottled abundance back to the central limit, the method can increase the adjustment frequency of the instantaneous abundance of the product, and as the adjustment times are increased, the separation work loss in the cascade is correspondingly increased.

Therefore, there is a need to design an improved product abundance control method to solve the above-mentioned problems of the prior art.

Disclosure of Invention

The invention provides a method for automatically controlling the abundance of a product in a material taking control mode, which is used for solving the technical problems that the abundance of the product is difficult to control stably due to more adjustment frequency and amplitude of the abundance of the product in the material collecting process in the prior art.

The technical scheme of the invention is as follows:

an automatic control method for product abundance in a material flow material taking control mode comprises the following steps:

step 1, setting a control signal;

step 1.1, selecting a control time point;

step 1.2, calculating the maximum deviation of abundance;

step 1.3, setting control signals in a segmented mode;

step 2, control signal feedback;

step 3, calculating the material taking pressure adjustment quantity;

step 3.1, calculating an instantaneous abundance target value;

step 3.2, calculating a material taking target control pressure;

and 4, controlling pressure adjustment by a regulator.

The step 1.1 selects a control time point, including: according to actual product production data, counting average time T of entering control limit value of bottled abundance ₁ As a control signal demarcation point.

The step 1.2 calculates the maximum deviation of abundance, including: collecting instantaneous abundance when external parameters are stable in a certain operation process, calculating the maximum deviation of the instantaneous abundance of a system, and controlling pressure P by combining control equipment ₂ Calculating the maximum deviation mu of the bottled abundance according to the relation among the instantaneous abundance, the control pressure and the bottled abundance _{Bottle (B)} 。

The step 1.3 of setting the control signal in a segmented manner comprises the following steps:

select μ ₀ The product control precision is the deviation of the bottle abundance and the target product abundance;

taking T1 as a time node, and setting a control upper limit C of bottled abundance in a segmented manner _upper And lower limit C _lower At this time, the upper limit control line coordinates (0, C) ₀ +μ _{Bottle (B)} ) Lower limit control line coordinates (0, C ₀ -μ _{Bottle (B)} ) The method comprises the steps of carrying out a first treatment on the surface of the Enter control range T ₁ Time upper limit control line coordinates (T ₁ ,C _upper ) Lower limit control line coordinates (T ₁ ,C _lower )。

At this time, the following calculation equation (1) of the bottled abundance control signal can be obtained

Lower limit equation (2) of the same theory

Wherein: c (C) _upper -controlling the upper limit value;

C _lower -control lower limit value;

C ₀ -target product abundance;

μ _{bottle (B)} -maximum deviation of bottled abundance;

μ ₀ -daily control accuracy of bottled abundance;

T ₁ -the shortest time for the bottled abundance to enter the control limit range;

-rate of bottled abundance into control line;

the step 2: control signal feedback, comprising: collecting instantaneous abundance at the current moment, calculating the current bottled abundance and upper and lower limit values of control signals, and comparing, so long as the bottled abundance does not meet C _lower ≤C _{Bottle (B)} ≤C _upper And sending out a control adjustment signal.

The step 3.1 calculates the target value of instantaneous abundance, which comprises the following steps:

calculating a target control value of the instantaneous abundance in the later period of the product according to the current container bottle abundance, the bottle loading capacity, the target container loading capacity and the target abundance;

in the formula (3):

C _target -post-transient abundance target control value

m _{Bottle (B)} Current container load

C _{Bottle (B)} -bottled abundance of the current container

m ₀ Target load of product container settings

C ₀ -product target abundance.

Step 3.2 calculates a take-off target control pressure, comprising:

fitting to obtain a relative change relation between the product taking amount and the instantaneous abundance of the product according to a linear relation between the product taking amount and the product abundance, wherein the relative change relation is represented by the following formula (4):

δG _P ＝β ₀ +β ₁ δC _P …………(4)

the product taking amount can be converted into a pore plate through the pore plate, namely the pressure is controlled after the regulator, and the following formula (5) is adopted:

G _P ＝kP ₂ d ² ………………(5)

wherein:

d, pore diameter of pore plate, unit cm;

k-orifice plate coefficient;

P ₂ -regulator control pressure, unit kPa;

G _P -product take-off, in g/s;

combining with a pore plate calculation formula to obtain a material taking pressure P ₂ Functional relationship with instantaneous abundance changes; substituting the target value of the later-period instantaneous abundance and the current average instantaneous abundance, and calculating to obtain the target pressure.

Step 4: the regulator controls pressure regulation, including:

setting a pressure control deviation delta P, and when the deviation between the online running pressure and the target pressure exceeds a set value, adjusting the pressure value of the regulator to the target value through slightly opening and slightly closing the valve opening of the regulator; and slightly opening the regulator valve opening when the online operation pressure is smaller than the target pressure, and slightly closing the regulator valve opening when the online operation pressure is larger than the target pressure.

The invention has the beneficial effects that:

the invention is suitable for intelligent control of the product abundance under the material flow control and material taking in the centrifugal separation field, and is a product abundance adjusting method with higher stability, which reduces the pressure adjusting frequency and adjusting amplitude of the abundance in the container material receiving stage, especially in the material receiving earlier stage, and the product receiving process is more stable, and the average standard deviation of the container bottled abundance is generally less than 0.00004.

Detailed Description

The following describes in detail a method for automatically controlling the abundance of a product in a manner of controlling the withdrawal of a stream according to the present invention, with reference to examples.

An automatic control method for product abundance in a material flow material taking control mode comprises the following steps:

step 1, setting a control signal;

step 1.1 selecting a control time point, comprising: according to actual product production data, counting average time T of entering control limit value of bottled abundance ₁ As a control signal demarcation point.

Step 1.2, calculating the maximum abundance deviation, comprising: collecting instantaneous abundance when external parameters are stable in a certain operation process, calculating the maximum deviation of the instantaneous abundance of a system, and controlling pressure P by combining control equipment ₂ Calculating the maximum deviation mu of the bottled abundance according to the relation among the instantaneous abundance, the control pressure and the bottled abundance _{Bottle (B)} 。

Step 1.3, setting control signals in a segmented manner, comprising:

select μ ₀ The product control precision is the deviation of the bottle abundance and the target product abundance;

taking T1 as a time node, and setting a control upper limit C of bottled abundance in a segmented manner _upper And lower limit C _lower At this time, the upper limit control line coordinates (0, C) ₀ +μ _{Bottle (B)} ) Lower limit control line coordinates (0, C ₀ -μ _{Bottle (B)} ) The method comprises the steps of carrying out a first treatment on the surface of the Enter control range T ₁ Time upper limit control line seatLabel (T) ₁ ,C _upper ) Lower limit control line coordinates (T ₁ ,C _lower )。

At this time, the following calculation equation (1) of the bottled abundance control signal can be obtained

Lower limit equation (2) of the same theory

Wherein:

C _upper -controlling the upper limit value;

C _lower -control lower limit value;

C ₀ -target product abundance;

μ _{bottle (B)} -maximum deviation of bottled abundance;

μ ₀ -daily control accuracy of bottled abundance;

T ₁ -the shortest time for the bottled abundance to enter the control limit range;

-rate of bottled abundance into control line;

step 2, control signal feedback; comprising the following steps: collecting instantaneous abundance at the current moment, calculating the current bottled abundance and upper and lower limit values of control signals, and comparing, so long as the bottled abundance does not meet C _lower ≤C _{Bottle (B)} ≤C _upper And sending out a control adjustment signal.

Step 3, calculating the material taking pressure adjustment quantity;

step 3.1, calculating an instantaneous abundance target value, comprising:

calculating a target control value of the instantaneous abundance in the later period of the product according to the current container bottle abundance, the bottle loading capacity, the target container loading capacity and the target abundance;

in the formula (3):

C _target -post-transient abundance target control value

m _{Bottle (B)} Current container load

C _{Bottle (B)} -bottled abundance of the current container

m ₀ Target load of product container settings

C ₀ -product target abundance.

Step 3.2, calculating a material taking target control pressure, comprising:

fitting to obtain a relative change relation between the product taking amount and the instantaneous abundance of the product according to a linear relation between the product taking amount and the product abundance, wherein the relative change relation is represented by the following formula (4):

δG _P ＝β ₀ +β ₁ δC _P …………(4)

the product taking amount can be converted into a pore plate through the pore plate, namely the pressure is controlled after the regulator, and the following formula (5) is adopted:

G _P ＝kP ₂ d ² ………………(5)

wherein:

d, pore diameter of pore plate, unit cm;

k-orifice plate coefficient;

P ₂ -regulator control pressure, unit kPa;

G _P -product take-off, in g/s;

combining with a pore plate calculation formula to obtain a material taking pressure P ₂ Functional relationship with instantaneous abundance changes; substituting the target value of the later-period instantaneous abundance and the current average instantaneous abundance, and calculating to obtain the target pressure.

Step 4, the regulator controls the pressure adjustment, including:

setting a pressure control deviation delta P, and when the deviation between the online running pressure and the target pressure exceeds a set value, adjusting the pressure value of the regulator to the target value through slightly opening and slightly closing the valve opening of the regulator; and slightly opening the regulator valve opening when the online operation pressure is smaller than the target pressure, and slightly closing the regulator valve opening when the online operation pressure is larger than the target pressure.

Examples

Examples: for example, the abundance of a centrifugal cascade product is adjusted, the material receiving container starts to receive materials at 22:36 of 14 days of 3 months of 2022, the target product abundance of the bottle container is 4.0%, and the target container loading amount is 6000kg.

Step 1: setting a control feedback signal

Step 1.1 selecting a control time point

According to actual operation statistics, considering that a scheme is converted into an unsteady state process, 10 measurement points (comprising 1 time/2 hour unsteady state process measurement and 1 time/4 hour steady state process measurement) are generally required to enter a control range for about 30 hours, so that a sectional control signal is established by taking T1=30h and taking 30 hours as a boundary.

Step 1.2 calculating the maximum deviation of abundance

In the actual production process of 4.65% of the product, when the external parameter and the auxiliary parameter fluctuate within the range, the same control pressure P ₂ 218 transient data were collected and the maximum bias in transient abundance was found to be about 0.011% by counting the distribution of the data in this set. The regulating device used on the product taking pipeline of the existing production line is a regulator, and the pressure control precision is sigma _P ＝0.01kPa。

When the bottled abundance of the product is usually calculated, the product receiving process is divided into a plurality of receiving processes according to the same time interval, so that a calculation formula of the bottled abundance is obtained

Wherein:

P _i -regulator control pressure during the ith time interval;

Δt—time interval, which typically takes 4h;

-average instantaneous abundance over a time interval;

the absolute deviation of the bottled abundance at this time was:

wherein:

calculating to obtain the maximum deviation mu of the bottled abundance _{Bottle (B)} ＝0.015％。

Step 1.3 set equations in segments

Selecting product control precision mu ₀ ＝0.002％，μ _{Bottle (B)} =0.015%. At the moment, the upper limit control line coordinate (0,4.0% + 0.015%) and the lower limit control line coordinate (0,4.0% -0.015%) of the material receiving starting point product are obtained; time T of entering control range ₁ At this time, the upper limit control line coordinates (30, cube), and the lower limit control line coordinates (30, clock) at the time of entering the control range.

At this time, the upper limit equation of the bottled abundance control line can be obtained

Lower limit equation

Step 2: control signal feedback

The current container bottled amount of 1077kg, control pressure of 4.94kPa and the bottled abundance of 3.9942% at the moment are calculated according to the current container bottled amount of 9:00 of 2022, 3 and 16, and the container is operated for 34.4 hours to exceed 30 hours, and the control signal value at the moment is calculatedC _upper ＝4.002％，C _lower = 3.998%. The bottled abundance is less than C _lower And (5) exceeding the control limit value and sending out a control signal.

Step 3: material taking pressure regulating amount calculating device

Step 3.1 calculating the instantaneous abundance control target value

Calculating the obtained instantaneous abundance control target value as the following formula (1)

Step 3.2 calculating the control pressure of the material taking target

The relative change of the product abundance and the relative change of the product material taking amount are in a linear relation, and fitting is carried out on the data to obtain a unitary linear regression model of the relative change of the product abundance and the material taking amount

δG _P ＝-2.00×10 ^-5 -1.224δC _P

By the calculation formula of the pore plate, the minimum term is ignored, the product material taking quantity is converted into the control pressure of the regulator, and the functional relation between the instantaneous abundance change of the product and the control pressure can be obtained as follows

Wherein:

P2 _target -product take-off control pressure target value;

P ₂ -the current product take-off control pressure;

C _target -a product instantaneous abundance control target value;

C _{instantaneous water} -the average instantaneous abundance of the current product;

substituting the target value 4.0013% of the instantaneous abundance and the current average instantaneous abundance 3.9935% into the target pressure 4.928kPa.

Step 4: regulator control pressure adjustment

The set offset ΔP is 0.007kPa, at which time the difference between the target control pressure and the on-line pressure is-0.012 kPa, the set offset is exceeded and is lower than the current on-line pressure, and the on-line operating pressure is greater than the target pressure, so the regulator valve is slightly closed, and the regulator control pressure is adjusted by 4.93kPa.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims (8)

1. The automatic control method for the product abundance in the material flow material taking control mode is characterized by comprising the following steps:

step 1, setting a control signal;

step 1.1, selecting a control time point;

step 1.2, calculating the maximum deviation of abundance;

step 1.3, setting control signals in a segmented mode;

step 2, control signal feedback;

step 3, calculating the material taking pressure adjustment quantity;

step 3.1, calculating an instantaneous abundance target value;

step 3.2, calculating a material taking target control pressure;

and 4, controlling pressure adjustment by a regulator.

2. The method for automatically controlling the abundance of a product in a material taking control mode according to claim 1, wherein the method comprises the following steps: the step 1.1 selects a control time point, including: according to actual product production data, counting average time T of entering control limit value of bottled abundance ₁ As a control signal demarcation point.

3. The method for automatically controlling the abundance of a product in a material taking control mode according to claim 2, wherein the method comprises the following steps: the step 1.2 calculates the maximum deviation of abundance, including: collecting instantaneous abundance when external parameters are stable in a certain operation process, calculating the maximum deviation of the instantaneous abundance of a system, and combining control equipment to controlPressure P ₂ Calculating the maximum deviation mu of the bottled abundance according to the relation among the instantaneous abundance, the control pressure and the bottled abundance _{Bottle (B)} 。

4. A method for automatically controlling product abundance in a flow take-off control according to claim 3, wherein: the step 1.3 of setting the control signal in a segmented manner comprises the following steps:

select μ ₀ The product control precision is the deviation of the bottle abundance and the target product abundance;

taking T1 as a time node, and setting a control upper limit C of bottled abundance in a segmented manner _upper And lower limit C _lower At this time, the upper limit control line coordinates (0, C) ₀ +μ _{Bottle (B)} ) Lower limit control line coordinates (0, C ₀ -μ _{Bottle (B)} ) The method comprises the steps of carrying out a first treatment on the surface of the Enter control range T ₁ Time upper limit control line coordinates (T ₁ ,C _upper ) Lower limit control line coordinates (T ₁ ,C _lower )。

At this time, the following calculation equation (1) of the bottled abundance control signal can be obtained

Lower limit equation (2) of the same theory

Wherein: c (C) _uppr -controlling the upper limit value;

C _lower -control lower limit value;

C ₀ -target product abundance;

μ _{bottle (B)} -maximum deviation of bottled abundance;

μ ₀ -daily control accuracy of bottled abundance;

T ₁ bottled abundance access controlThe shortest time of the limit range;

-the rate at which the bottled abundance enters the control line. />

5. The method for automatically controlling the abundance of a material in a material taking control mode according to claim 4, wherein the method comprises the following steps: the step 2: control signal feedback, comprising: collecting instantaneous abundance at the current moment, calculating the current bottled abundance and upper and lower limit values of control signals, and comparing, so long as the bottled abundance does not meet C _lower ≤C _{Bottle (B)} ≤C _upper And sending out a control adjustment signal.

6. The method for automatically controlling the abundance of a material in a feeding and withdrawing control mode according to claim 5, wherein: the step 3.1 calculates the target value of instantaneous abundance, which comprises the following steps:

calculating a target control value of the instantaneous abundance in the later period of the product according to the current container bottle abundance, the bottle loading capacity, the target container loading capacity and the target abundance;

in the formula (3):

C _target -post-transient abundance target control value

m _{Bottle (B)} Current container load

C _{Bottle (B)} -bottled abundance of the current container

m ₀ Target load of product container settings

C ₀ -product target abundance.

7. The method for automatically controlling the abundance of a material in a feeding and withdrawing control mode according to claim 6, wherein: step 3.2 calculates a take-off target control pressure, comprising:

fitting to obtain a relative change relation between the product taking amount and the instantaneous abundance of the product according to a linear relation between the product taking amount and the product abundance, wherein the relative change relation is represented by the following formula (4):

δG _P ＝β ₀ +β ₁ δC _P …………(4)

the product taking amount can be converted into a pore plate through the pore plate, namely the pressure is controlled after the regulator, and the following formula (5) is adopted:

G _P ＝kP ₂ d ² ………………(5)

wherein:

d, pore diameter of pore plate, unit cm;

k-orifice plate coefficient;

P ₂ -regulator control pressure, unit kPa;

G _P -product take-off, in g/s;

combining with a pore plate calculation formula to obtain a material taking pressure P ₂ Functional relationship with instantaneous abundance changes; substituting the target value of the later-period instantaneous abundance and the current average instantaneous abundance, and calculating to obtain the target pressure.

8. The method for automatically controlling the abundance of a material in a feeding and withdrawing control mode according to claim 7, wherein: step 4: the regulator controls pressure regulation, including:

setting a pressure control deviation delta P, and when the deviation between the online running pressure and the target pressure exceeds a set value, adjusting the pressure value of the regulator to the target value through slightly opening and slightly closing the valve opening of the regulator; and slightly opening the regulator valve opening when the online operation pressure is smaller than the target pressure, and slightly closing the regulator valve opening when the online operation pressure is larger than the target pressure.