阅读说明：本技术 逆流洗盐器排盐系统及逆洗排盐控制方法 (Salt discharge system of counter-current salt washer and counter-current salt discharge control method ) 是由 夏俊超 李广林 张仂 赵淑芳 刘亚楠 于 2021-08-31 设计创作，主要内容包括：本发明创造提供了一种逆流洗盐器排盐系统及逆洗排盐控制方法,逆流洗盐器排盐系统包括逆流洗盐器、为逆流洗盐器持续提供待洗盐浆的供料端、为逆流洗盐器提供逆流洗涤所需新卤的供卤端、用于排出逆流洗盐器已洗盐浆的排盐管道；逆流洗盐器设置有称重传感器,排盐管道设置有可与称重传感器连锁的自动阀门。本发明创造所述的逆流洗盐器排盐系统增加了可测量逆流洗盐器重量的称重传感器,并在排盐管道上设置与称重传感器连锁的自动阀门,通过称重传感器信号自动控制自动阀门开度的方式,实现逆流洗盐器排盐过程的自动控制。(The invention provides a salt discharge system of a counter-current salt washer and a counter-current salt discharge control method, wherein the salt discharge system of the counter-current salt washer comprises the counter-current salt washer, a material supply end which continuously provides salt slurry to be washed for the counter-current salt washer, a brine supply end which provides new brine required by counter-current washing for the counter-current salt washer, and a salt discharge pipeline which is used for discharging the washed salt slurry of the counter-current salt washer; the countercurrent salt scrubber is provided with a weighing sensor, and the salt discharge pipeline is provided with an automatic valve which can be interlocked with the weighing sensor. The salt discharge system of the countercurrent salt washer is additionally provided with the weighing sensor capable of measuring the weight of the countercurrent salt washer, the automatic valve linked with the weighing sensor is arranged on the salt discharge pipeline, and the automatic control of the salt discharge process of the countercurrent salt washer is realized in a mode that the opening of the automatic valve is automatically controlled by signals of the weighing sensor.)

1. The salt discharging system of the counter-current salt scrubber is characterized in that: the device comprises a countercurrent salt washer, a feeding end for continuously providing salt slurry to be washed for the countercurrent salt washer, a brine supply end for providing new brine required by countercurrent washing for the countercurrent salt washer, and a salt discharge pipeline for discharging the washed salt slurry of the countercurrent salt washer; the countercurrent salt scrubber is provided with a weighing sensor, and the salt discharge pipeline is provided with an automatic valve which can be interlocked with the weighing sensor.

2. The reverse flow salt scrubber salt discharge system as set forth in claim 1, wherein: the feeding end comprises a first storage tank, a salt slurry pump and a cyclone which are sequentially connected through a pipeline; the outlet end of the salt slurry to be washed of the cyclone is connected with the inlet end of the salt slurry to be washed of the countercurrent salt washer through a pipeline, and the mother liquor outlet end of the cyclone is connected with the first storage tank through a pipeline.

3. The reverse flow salt scrubber salt discharge system as set forth in claim 1, wherein: the brine supply end comprises a brine supply pipeline connected with a brine inlet of the countercurrent salt scrubber; and an overflow port of the countercurrent salt washer is connected with the first storage tank through a pipeline.

4. The reverse flow salt scrubber salt discharge system as set forth in claim 1, wherein: and the outlet end of the salt discharge pipeline is connected with the second storage tank.

5. The method for controlling reverse-washing salt discharge of a salt discharge system of a reverse-flow salt scrubber as claimed in any one of claims 1 to 4, characterized by comprising the steps of:

step one, debugging and operating:

s1, injecting saturated brine into the countercurrent salt washer, and measuring the weight G of the full brine of the countercurrent salt washer by a weighing sensor₁；

S2, injecting the salt slurry to be washed into the countercurrent salt washer, depositing salt particles in the countercurrent salt washer, and allowing brine to flow out of an overflow port of the countercurrent salt washer; when the salt particles are accumulated to the highest limit, the weight G of the full salt of the countercurrent salt washer is measured by the weighing sensor₂；

S3, recording the solid-liquid ratio in the countercurrent salt washer as beta, and recording the weight of the countercurrent salt washer measured by the weighing sensor in the normal production process as G₃The solid-to-liquid ratio in the countercurrent salt scrubber is (G)₃-G₁)/(G₂-G₁) Wherein G is₁≤G₃≤G₂，G₁＝G₃When beta is 0, G₂＝G₃When beta is 100%;

s4, testing the salt discharging system of the countercurrent salt washer, and manually adjusting and determining the solid-liquid ratio beta of the salt discharging system of the countercurrent salt washer capable of stably running for a long time₁The weight G of the countercurrent salt scrubber at the moment is measured by a weighing sensor₄The opening of the automatic valve on the salt discharge pipeline is gamma₁；

S5, closing an automatic valve on the salt discharge pipeline, adjusting the initial state of the system, wherein the solid-liquid ratio of the system at the moment is beta ', manually adjusting the opening of the automatic valve to enable the beta ' to be smoothly adjusted to beta 1 within an acceptable time, and recording the opening gamma ' of the automatic valve at the moment; adjusting different beta 'and respectively measuring corresponding automatic valve opening gamma' to form a comparison table of the solid-liquid ratio beta and the valve opening gamma;

s6, according toThe obtained solid-liquid ratio beta and the valve opening gamma are compared to obtain a regression equation, and then the solid-liquid ratio beta calculation formula obtained in S3 is substituted to ensure that G₃Form a functional corresponding relation with the valve opening and is recorded as gamma-f (G)₃)；

S7, obtaining G₃After the function relation with gamma, G is under the condition of interlocking automatic control of the automatic valve and the weighing sensor₃Passing function gamma-f (G) in control system₃) Converting into valve opening gamma data, and controlling the opening of the automatic valve;

step two, a formal operation stage:

s1, starting the system, wherein the automatic valve is closed, and the weight measured by the weighing sensor is G₃；

S2, with the system running, G₃Gradually increase when G₃＝G₄When the valve is opened, the automatic valve is opened with the opening degree of gamma₁；

S3, interlocking the weighing sensor with the automatic valve, and obtaining G measured by the weighing sensor₃Passing function gamma-f (G) in control system₃) And converting the data into valve opening gamma data, and controlling the opening of the automatic valve according to the data, wherein the system operates normally and stably.

6. The backwash salt discharge control method according to claim 5, characterized in that: the second step further comprises a parking stage of S4: when the vehicle is emergently stopped, all parts of the system are closed according to the emergency stop sequence, and the automatic valve is closed; when the automobile is temporarily stopped, all parts of the system are closed according to the stopping sequence, and the opening of the automatic valve is kept to be gamma₁(ii) a When the vehicle is parked for a long time, the chain between the weighing sensor and the automatic valve is disconnected, and the manual mode is changed to finish the parking operation.

7. The backwash salt discharge control method according to claim 6, characterized in that: the short-time parking time is 8-24 hours.

8. The backwash salt discharge control method according to claim 5, characterized in that: the automatic control part is controlled by a DCS or PLC control system.

Technical Field

The invention belongs to the field of production of crushed washing salt, and particularly relates to a salt discharge system of a counter-current salt washer and a counter-current salt discharge control method.

Background

The crushing and washing salt is a relatively mature edible salt production process, and comprises a plurality of procedures of crushing by a double-roller crusher, stirring and washing, spiral washing, countercurrent washing and the like. The process can retain crystal particles and components of sun-dried sea salt, and the finished product has large particles and rich taste and is more in line with salt habits of residents in coastal areas. Wherein the countercurrent washing is an important link. The countercurrent washing refers to that the salt slurry to be washed is in direct contact with the brine used for washing in an opposite flow direction, the brine carries away impurities, and the salt slurry continues to enter the next link to finish the washing process of the step. This process is typically accomplished using a counter current salt scrubber. However, the material level state in the countercurrent salt washer is difficult to judge due to the high mixing degree of the salt slurry and the brine in the countercurrent salt washer, and the treatment is still carried out in a manual judgment mode of workers with abundant operation experience at present.

In the prior powder salt washing production process, the problems that the field operation participation of workers is overhigh, the automation level is low, and the production running state extremely tests the experience of operators are solved, an automatic control system capable of realizing stable running is established, and the method has important significance for the powder salt washing industry. The counter-current washing process is used as an important ring in the production process of crushing and washing salt, solves the problem of automatic control of the counter-current washing process, and can qualitatively improve the overall automatic control level. At present, the salt discharge process in the countercurrent washing link is judged by the experience of operators, and if the experience is insufficient, the fluctuation of the whole production line is likely to be severe. Therefore, the need for automation of salt discharge of the counter-current salt scrubber is urgent, but no report on a salt discharge control method of the counter-current salt scrubber is available.

Disclosure of Invention

In view of the above, in order to solve the problems that the manual dependence degree is too high, the automation level is low, and the production running state extremely tests the experience of operators in the counter-current washing salt discharging process, the invention provides a salt discharging system of a counter-current salt washer and a counter-current salt discharging control method, so that the reliable operation of the salt discharging automation of the counter-current salt washer is realized.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the salt discharge system of the countercurrent salt washer comprises the countercurrent salt washer, a material supply end which continuously provides salt slurry to be washed for the countercurrent salt washer, a brine supply end which provides new brine required by countercurrent washing for the countercurrent salt washer, and a salt discharge pipeline which is used for discharging the washed salt slurry of the countercurrent salt washer; the countercurrent salt scrubber is provided with a weighing sensor, and the salt discharge pipeline is provided with an automatic valve which can be interlocked with the weighing sensor.

Further, the feeding end comprises a first storage tank, a salt slurry pump and a cyclone which are sequentially connected through a pipeline; the outlet end of the salt slurry to be washed of the cyclone is connected with the inlet end of the salt slurry to be washed of the countercurrent salt washer through a pipeline, and the mother liquor outlet end of the cyclone is connected with the first storage tank through a pipeline.

Pumping the salt slurry in the first storage tank into a cyclone through a salt slurry pump, thickening the salt slurry by the cyclone, then feeding the thickened salt slurry into a countercurrent salt washer, carrying out countercurrent washing on new brine entering the countercurrent salt washer and the salt slurry to be washed, and discharging the washed salt slurry through a salt discharge pipeline; the mother liquor of the cyclone returns to the first storage tank through the mother liquor outlet end of the cyclone, namely returns to the front-end process for recycling.

Further, the brine supply end comprises a brine supply pipeline connected with a brine inlet of the countercurrent salt scrubber; and an overflow port of the countercurrent salt washer is connected with the first storage tank through a pipeline.

The brine supply pipeline provides new brine required by countercurrent washing for the countercurrent salt washer; and the overflow liquid of the countercurrent salt washer flows out of an overflow port of the countercurrent salt washer and returns to the first storage tank, namely returns to the front-end process for recycling.

Furthermore, the outlet end of the salt discharge pipeline is connected with the second storage tank.

The salt discharging system of the countercurrent salt scrubber is controlled by a manual control system and a DCS or PLC control system.

The reverse-washing salt-discharging control method adopting the salt-discharging system of the reverse-flow salt washer comprises the following steps:

step one, debugging and operating:

s1, directionSaturated brine is injected into the countercurrent salt washer, and the weight G of the full brine of the countercurrent salt washer is measured by a weighing sensor₁；

S2, injecting the salt slurry to be washed into the countercurrent salt washer, depositing salt particles in the countercurrent salt washer, and allowing brine to flow out of an overflow port of the countercurrent salt washer; when the salt particles are accumulated to the highest limit, the weight G of the full salt of the countercurrent salt washer is measured by the weighing sensor₂；

S3, recording the solid-liquid ratio in the countercurrent salt washer as beta, and recording the weight of the countercurrent salt washer measured by the weighing sensor in the normal production process as G₃The solid-to-liquid ratio in the countercurrent salt scrubber is (G)₃-G₁)/(G₂-G₁) Wherein G is₁≤G₃≤G₂，G₁＝G₃When beta is 0, G₂＝G₃When beta is 100%;

s4, testing the salt discharging system of the countercurrent salt washer, and manually adjusting and determining the solid-liquid ratio beta of the salt discharging system of the countercurrent salt washer capable of stably running for a long time₁The weight G of the countercurrent salt scrubber at the moment is measured by a weighing sensor₄The opening of the automatic valve on the salt discharge pipeline is gamma₁；

S5, closing the automatic valve on the salt discharge pipeline, adjusting the initial state of the system, wherein the solid-liquid ratio of the system at the moment is beta ', and manually adjusting the opening of the automatic valve to enable beta' to be smoothly adjusted to beta within an acceptable time₁Recording the opening gamma' of the automatic valve at the moment; adjusting different beta 'and respectively measuring corresponding automatic valve opening gamma' to form a comparison table of the solid-liquid ratio beta and the valve opening gamma;

s6, solving a regression equation according to the obtained comparison table of the solid-liquid ratio beta and the valve opening gamma, and substituting the calculation formula of the solid-liquid ratio beta obtained in the step S3 to lead G₃Form a functional corresponding relation with the valve opening and is recorded as gamma-f (G)₃)；

S7, obtaining G₃After the function relation with gamma, G is under the condition of interlocking automatic control of the automatic valve and the weighing sensor₃Passing function gamma-f (G) in control system₃) Converting into valve opening gamma data, and controlling the opening of the automatic valve;

step two, a formal operation stage:

s1, starting the system, wherein the automatic valve is in a closed state, and the weight measured by the weighing sensor is G3;

s2, with the system running, G₃Gradually increase when G₃＝G₄When the valve is opened, the automatic valve is opened with the opening degree of gamma₁；

S3, interlocking the weighing sensor with the automatic valve, and obtaining G measured by the weighing sensor₃Passing function gamma-f (G) in control system₃) And converting the data into valve opening gamma data, and controlling the opening of the automatic valve according to the data, wherein the system operates normally and stably.

In step two, S2, G is executed as the system is operated₃In the process of gradual increase, when G is₁＜G₃＜G₄In the process, an operator needs to pay attention to whether the system is normal (for example, whether a halogen supply pipeline supplies halogen, whether overflow liquid exists, and the like): if the driving process is normal, the driving process is continued, and if the driving process is abnormal, the reason needs to be analyzed and the driving process can be continued after the reason is solved.

Further, the second step further includes a S4 parking stage: when the vehicle is emergently stopped, all parts of the system are closed according to the emergency stop sequence, and the automatic valve is closed; when the automobile is temporarily stopped, all parts of the system are closed according to the stopping sequence, and the opening of the automatic valve is kept to be gamma₁(ii) a When the vehicle is parked for a long time, the chain between the weighing sensor and the automatic valve is disconnected, and the manual mode is changed to finish the parking operation.

Further, the short-time parking time is 8-24 hours.

Furthermore, the automatic control part is controlled by a DCS or PLC control system.

Compared with the prior art, the salt discharge system of the countercurrent salt washer and the reverse washing salt discharge control method have the following advantages:

(1) the salt discharge system of the countercurrent salt washer is created on the basis of the original countercurrent salt washer, the automatic control of the salt discharge process of the countercurrent salt washer is realized by adding a weighing sensor capable of measuring the weight of the countercurrent salt washer, arranging an automatic valve linked with the weighing sensor on a salt discharge pipeline and automatically controlling the opening of the automatic valve through the signal of the bearing sensor; the system realizes the salt discharge automation of the countercurrent salt washer, and has simple structure and low cost.

(2) The invention creates the reverse-washing salt-discharging control method which is matched with a salt-discharging system of a reverse-flow salt-washing device, and the automatic valve and the weighing sensor are interlocked and automatically controlled, the reading of the weighing sensor and the opening of the valve form a functional corresponding relation, and the opening of the automatic valve is controlled according to the functional corresponding relation, so that the problems that the manual dependence degree is too high in the reverse-flow washing salt-discharging process, the production running state extremely tests the experience of operators are solved, and the automatic and reliable running of the reverse-flow salt-washing device in salt-discharging is realized.

Drawings

FIG. 1 is a schematic structural diagram of a salt discharge system of a counter-current salt scrubber according to an embodiment of the present invention;

FIG. 2 is a graph of regression of the logarithmic function as described in inventive example 1;

FIG. 3 is a graph of regression of polynomial functions according to inventive example 1;

FIG. 4 is a graph of regression of polynomial functions according to inventive example 2;

fig. 5 is a graph of regression of polynomial functions as described in inventive example 3.

In the figure: 1-a countercurrent salt washer; 2-a salt discharge pipeline; 3-a weighing sensor; 4-automatic valve; 5-storage tank I; 6-salt slurry pump; 7-a swirler; 8-a brine supply pipe; and 9-storage tank II.

Detailed Description

Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.

The invention is described in detail below with reference to embodiments and the accompanying drawings.

The structure of the salt discharge system of the counter-current salt washer in the following embodiments is as follows (the specific types of the equipment, the pipelines and the like are shown in the embodiments):

as shown in fig. 1, the salt discharge system of the countercurrent salt scrubber comprises a countercurrent salt scrubber 1, a feeding end for continuously providing salt slurry to be washed for the countercurrent salt scrubber, a brine supply end for providing new brine required by countercurrent washing for the countercurrent salt scrubber, and a salt discharge pipeline 2 for discharging the salt slurry washed by the countercurrent salt scrubber; the counter-flow salt washer is provided with a weighing sensor 3, and the salt discharge pipeline 2 is provided with an automatic valve 4 which can be interlocked with the weighing sensor 3;

the feeding end comprises a first storage tank 5, a salt slurry pump 6 and a swirler 7 which are sequentially connected through a pipeline; the outlet end of the salt slurry to be washed of the cyclone 7 is connected with the inlet end of the salt slurry to be washed of the countercurrent salt washer 1 through a pipeline, and the mother liquor outlet end of the cyclone 7 is connected with the first storage tank 5 through a pipeline;

the brine supply end comprises a brine supply pipeline 8 connected with a brine inlet of the countercurrent salt scrubber 1; an overflow port of the countercurrent salt washer 1 is connected with the first storage tank 5 through a pipeline;

the outlet end of the salt discharge pipeline 2 is connected with a second storage tank 9;

the salt discharging system of the counter-current salt scrubber is controlled by a manual control system and a DCS or PLC control system.

Example 1

1. Device model selection

Salt slurry pump: q is 160m³/h，H＝32m；

A swirler:

a countercurrent salt washer: Φ 2900 × 7500;

a salt discharge pipeline: DN 125;

a brine supply pipeline: DN 65.

2. Reverse washing salt-discharging control process

1) Saturated brine is injected into the countercurrent salt washer, and the weight G of the full brine of the countercurrent salt washer is measured by a weighing sensor₁＝50050kg；

2) The salt slurry is pumped into the cyclone through the salt slurry pump, the thickened salt slurry is sent into the countercurrent salt washer until salt particles are accumulated to the highest limit, and the countercurrent salt washer is measured by the weighing sensorFull salt weight G₂＝54899kg；

3) The weight of the countercurrent salt scrubber in normal production is G₃The solid-to-liquid ratio in the countercurrent salt scrubber is (G)₃-G₁)/(G₂-G₁)＝(0.000206G₃-10.322)*100％；

4) The whole salt discharge system of the countercurrent salt scrubber is tested and operated, and the solid-liquid ratio beta of the long-term stable operation of the salt discharge system of the countercurrent salt scrubber is adjusted and determined in a manual mode₁30%, and the opening of the automatic valve is gamma₁＝80％；

5) Closing an automatic valve on a salt discharge pipeline, adjusting the initial state of the system, wherein the solid-liquid ratio of the system at the moment is beta ', manually adjusting the opening of the automatic valve to enable the beta ' to be slowly adjusted to beta 1 within an acceptable time, and recording the opening gamma ' of the automatic valve at the moment; adjusting different beta 'and respectively measuring corresponding automatic valve opening gamma' to form a comparison table of the solid-liquid ratio beta and the valve opening gamma; because the valve cannot be adjusted steplessly by manual adjustment, the opening of the valve is 5 percent as the first gear, and after data is collated, the data is arranged according to G₃Arranged from small to large as in table 1:

TABLE 1 summary of the parameters under manual operation

	G1	G2	G3	Solid-to-liquid ratio beta	Opening degree gamma
						1	50050	54899	50103	1.09％	0.00％
2	50050	54899	50214	3.38％	0.00％
						3	50050	54899	50308	5.32％	0.00％
4	50050	54899	50436	7.96％	15.00％
						5	50050	54899	50518	9.65％	15.00％
6	50050	54899	50621	11.78％	25.00％
						7	50050	54899	50705	13.51％	30.00％
8	50050	54899	50812	15.71％	40.00％
						9	50050	54899	50935	18.25％	50.00％
10	50050	54899	51092	21.49％	65.00％
						11	50050	54899	51204	23.80％	70.00％
12	50050	54899	51339	26.58％	75.00％
						13	50050	54899	51452	28.91％	80.00％
14	50050	54899	51561	31.16％	85.00％
						15	50050	54899	51680	33.62％	90.00％
16	50050	54899	51796	36.01％	95.00％
						17	50050	54899	52058	41.41％	100.00％
18	50050	54899	52468	49.87％	100.00％

6) The analysis data shows that: after item 17, the valve opening is 100% (full open), and when the actually specified solid-to-liquid ratio β is not less than 40%, the valve opening γ is 100%; before item 4, the valve opening is 0% (full closing), and when the actually specified solid-liquid ratio β is less than or equal to 7%, the valve opening γ is 0%; then, taking items 4 to 16 and supplementing three groups of data of 40% β, 7% β, 0% β, 30% β and 80% γ, solving a regression equation according to the data (solving by using EXCEL), and drawing a scatter diagram and a trend line as shown in fig. 2 and 3;

as can be seen from the analysis of FIGS. 2 and 3, the fitting of the exponential function regression curve is more accurate when the solid-to-liquid ratio β is between 20% and 40%, and the range is normal in the production process, so the exponential function regression equation is selected. Because the exponential regression equation is smaller than zero when beta is 7%, which is not practical, the valve opening gamma is 0% when beta is less than or equal to 8%;

7) substituting beta and G₃A function of the obtained G of the weighing sensor₃Form a function corresponding relation with the valve opening gamma, the function is

8) Substituting the measured data into a formula for calculation, and checking the difference between the measured data and the actual operation data, which is specifically shown in table 2:

TABLE 2 comparison table of actual operation and function calculation

As can be seen from the analysis of Table 2, in the main working interval, the difference between the opening degree calculated by the function and the actual operation opening degree is not large, so that the function can be regarded as meeting the operation requirement and can be used as the weight G of the countercurrent salt scrubber in the actual operation₃A function associated with the valve opening γ;

9) to obtain G₃After the function relation with gamma, G is under the condition of interlocking automatic control of the automatic valve and the weighing sensor₃Passing function gamma-f (G) in control system₃) Converting into valve opening gamma data, and controlling the opening of the automatic valve;

10) and (5) formally running.

Example 2

1. Device model selection

Salt slurry pump: q is 40-60m³/h，H＝16-22m；

A swirler:

a countercurrent salt washer: Φ 2000 × 4700;

a salt discharge pipeline: DN 100;

a brine supply pipeline: DN 40.

2. Reverse washing salt-discharging control process

1) Saturated brine is injected into the countercurrent salt washer, and the fullness of the countercurrent salt washer is measured by a weighing sensorWeight of brine G₁＝12434kg；

2) The salt slurry is pumped into a cyclone through a salt slurry pump, the salt slurry is thickened and then is sent into a countercurrent salt washer, and the salt particle accumulation is limited to the maximum, and the full salt weight G of the countercurrent salt washer is measured by a weighing sensor₂＝13542kg；

3) The weight of the countercurrent salt scrubber in normal production is G₃The solid-to-liquid ratio in the countercurrent salt scrubber is (G)₃-G₁)/(G₂-G₁)＝(0.0009025G₃-11.222)*100％；

4) The whole salt discharge system of the countercurrent salt scrubber is tested and operated, and the solid-liquid ratio beta of the long-term stable operation of the salt discharge system of the countercurrent salt scrubber is adjusted and determined in a manual mode₁35% and the opening of the automatic valve is gamma₁＝70％；

5) Closing an automatic valve on a salt discharge pipeline, adjusting the initial state of the system, wherein the solid-liquid ratio of the system at the moment is beta ', manually adjusting the opening of the automatic valve to enable the beta ' to be slowly adjusted to beta 1 within an acceptable time, and recording the opening gamma ' of the automatic valve at the moment; adjusting different beta 'and respectively measuring corresponding automatic valve opening gamma' to form a comparison table of the solid-liquid ratio beta and the valve opening gamma; because the valve cannot be adjusted steplessly by manual adjustment, the opening of the valve is 5 percent as the first gear, and after data is collated, the data is arranged according to G₃Arranged from small to large as in table 3:

TABLE 3 summary of the various parameters under manual operation

	G1	G2	G3	Solid-to-liquid ratio beta	Opening degree gamma
						1	12434	13542	12473	3.52％	0.00％
2	12434	13542	12501	6.05％	0.00％
						3	12434	13542	12526	8.30％	0.00％
4	12434	13542	12549	10.38％	10.00％
						5	12434	13542	12573	12.55％	10.00％
6	12434	13542	12606	15.52％	15.00％
						7	12434	13542	12631	17.78％	15.00％
8	12434	13542	12657	20.13％	20.00％
						9	12434	13542	12682	22.38％	30.00％
10	12434	13542	12703	24.28％	40.00％
						11	12434	13542	12725	26.26％	50.00％
12	12434	13542	12754	28.88％	60.00％
						13	12434	13542	12776	30.87％	65.00％
14	12434	13542	12796	32.67％	70.00％
						15	12434	13542	12822	35.02％	70.00％
16	12434	13542	12850	37.55％	75.00％
						17	12434	13542	12876	39.89％	80.00％
18	12434	13542	12903	42.33％	95.00％
						19	12434	13542	12932	44.95％	100.00％
20	12434	13542	12967	48.10％	100.00％

6) The analysis data shows that: after item 19, the valve opening is 100% (full opening), and when the actually specified solid-to-liquid ratio β is not less than 43%, the valve opening γ is 100%; before item 4, the valve opening is 0% (full closing), and when the actually specified solid-liquid ratio β is less than or equal to 9%, the valve opening γ is 0%; then, taking items 4 to 16 and supplementing three groups of data of 43% β, 9% γ, 0% β, 35% γ and 70%, solving a regression equation according to the data (solving by using EXCEL), and drawing a scatter diagram and a trend line as shown in fig. 4;

as can be seen from the analysis of fig. 4, although the correlation relationship is not determined by an exponential or quadratic method, the fitting condition of the function regression curve is more accurate, and therefore the function regression equation is selected. Because the exponential regression equation is smaller than zero when beta is 8%, which is not practical, the valve opening gamma is 0% when beta is less than or equal to 9%;

7) substituting beta and G₃A function of the obtained G of the weighing sensor₃Form a function corresponding relation with the valve opening gamma, the function is

Wherein, a is 0.0009025G₃-11.222

8) Substituting the measured data into a formula for calculation, and checking the difference between the measured data and the actual operation data, which is specifically shown in the table 4:

TABLE 4 comparison table of actual operation and function calculation

As can be seen from the analysis of Table 4, in the main working interval, the difference between the opening degree calculated by the function and the actual operation opening degree is not large, so that the function can be regarded as meeting the operation requirement and can be used as the weight G of the countercurrent salt scrubber in the actual operation₃A function associated with the valve opening γ;

9) to obtain G₃After the function relation with gamma, G is under the condition of interlocking automatic control of the automatic valve and the weighing sensor₃Passing function gamma-f (G) in control system₃) Converting into valve opening gamma data, and controlling the opening of the automatic valve;

10) and (5) formally running.

Example 3

1. Device model selection

Salt slurry pump: q is 100m³/h，H＝25m；

A swirler:

a countercurrent salt washer: Φ 1900 × 9000;

a salt discharge pipeline: DN 125;

a brine supply pipeline: DN 125.

2. Reverse washing salt-discharging control process

1) Saturated brine is injected into the countercurrent salt washer, and the weight G of the full brine of the countercurrent salt washer is measured by a weighing sensor₁＝40502kg；

2) The salt slurry is pumped into a cyclone through a salt slurry pump, the salt slurry is thickened and then is sent into a countercurrent salt washer, and the salt particle accumulation is limited to the maximum, and the full salt weight G of the countercurrent salt washer is measured by a weighing sensor₂＝44038kg；

3) The weight of the countercurrent salt scrubber in normal production is G₃The solid-to-liquid ratio in the countercurrent salt scrubber is (G)₃-G₁)/(G₂-G₁)＝(0.0002828G₃-11.454)*100％；

4) The whole salt discharge system of the countercurrent salt scrubber is tested and operated, and the solid-liquid ratio beta of the long-term stable operation of the salt discharge system of the countercurrent salt scrubber is adjusted and determined in a manual mode₁30%, and the opening of the automatic valve is gamma₁＝70％；

5) Closing an automatic valve on the salt discharge pipeline, adjusting the initial state of the system, wherein the solid-liquid ratio of the system at the moment is beta ', and manually adjusting the opening of the automatic valve to enable the beta ' to be smoothly adjusted to the beta ' within an acceptable timeBeta 1, recording the opening gamma' of the automatic valve at the moment; adjusting different beta 'and respectively measuring corresponding automatic valve opening gamma' to form a comparison table of the solid-liquid ratio beta and the valve opening gamma; because the valve cannot be adjusted steplessly by manual adjustment, the opening of the valve is 5 percent as the first gear, and after data is collated, the data is arranged according to G₃Arranged from small to large as in table 1:

TABLE 5 summary of the parameters under manual operation

	G1	G2	G3	Solid-to-liquid ratio beta	Opening degree gamma
						1	40502	44038	40615	3.20％	0.00％
2	40502	44038	40705	5.74％	0.00％
						3	40502	44038	40811	8.74％	5.00％
4	40502	44038	40902	11.31％	10.00％
						5	40502	44038	41021	14.68％	25.00％
6	40502	44038	41106	17.08％	35.00％
						7	40502	44038	41231	20.62％	45.00％
8	40502	44038	41312	22.91％	55.00％
						9	40502	44038	41407	25.59％	60.00％
10	40502	44038	41523	28.87％	65.00％
						11	40502	44038	41605	31.19％	70.00％
12	40502	44038	41713	34.25％	75.00％
						13	40502	44038	41809	36.96％	80.00％
14	40502	44038	41887	39.17％	90.00％
						15	40502	44038	41904	39.65％	95.00％
16	40502	44038	42011	42.68％	100.00％
						17	40502	44038	42136	46.21％	100.00％
18	40502	44038	42343	52.06％	100.00％

6) The analysis data shows that: after item 16, the valve opening is 100% (full open), and when the actually specified solid-to-liquid ratio β is not less than 40%, the valve opening γ is 100%; before item 3, the valve opening is 0% (full closing), and when the actually specified solid-liquid ratio β is less than or equal to 8%, the valve opening γ is 0%; then, taking the items 3 to 15 and supplementing three groups of data of 40% β, 8% β, 0% β, 30% β and 70% γ, solving a regression equation according to the above data (using EXCEL to solve), and drawing a scatter diagram and a trend line as shown in fig. 5;

as can be seen from the analysis of fig. 5, although the correlation is not determined by exponential or quadratic method, the fitting condition of the function regression curve is more accurate, and therefore the function regression equation is selected.

7) Substituting beta and G₃A function of the obtained G of the weighing sensor₃Form a function corresponding relation with the valve opening gamma, the function is

Wherein, a is 0.0002828G₃-11.454

8) Substituting the measured data into a formula for calculation, and checking the difference between the measured data and the actual operation data, which is specifically shown in table 6:

TABLE 6 comparison table of actual operation and function calculation

As can be seen from the analysis of Table 6, in the main operation region, the opening degree and the actual operation are calculated by the functionThe difference of the opening degrees is not large, so that the function can be regarded as meeting the operation requirement and can be used as the weight G of the countercurrent salt washer in actual operation₃A function associated with the valve opening γ;

9) to obtain G₃After the function relation with gamma, G is under the condition of interlocking automatic control of the automatic valve and the weighing sensor₃Passing function gamma-f (G) in control system₃) Converting into valve opening gamma data, and controlling the opening of the automatic valve;

10) and (5) formally running.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.