CN116520778A - Intelligent control method for precipitation method silicon dioxide reaction process - Google Patents

Abstract

The invention belongs to the technical field of fine chemical engineering reaction engineering, and particularly relates to an intelligent control method for a reaction process of silicon dioxide by a precipitation method. The method comprises the steps of designing a specific control device for the precipitation method silica reaction process, wherein the specific control device comprises various storage tanks, pipeline connection and connection position relations of various pumps, valves and metering instruments, designing a specific control method according to the control devices, writing a corresponding control program designed by the control method into a DSC, and electrically connecting the DSC with the various pumps, the valves and the metering instruments to realize continuous automatic production of the precipitation method silica, so that various process parameters in the process are automatically adjusted and accurately controlled.

Description

Intelligent Control Method of Precipitation Silica Reaction Process

technical field

The invention belongs to the technical field of fine chemical reaction engineering, and in particular relates to an intelligent control method for the reaction process of precipitation silicon dioxide.

Background technique

Precipitated silica is a technology that uses chemical methods to change the composition and structure of substances or to synthesize new substances, that is, chemical processes, and the resulting products are called chemical products. At first, the production of this kind of products was manual and semi-automatic operation of production equipment mode. Material feeding, discharging, mixing, etc. had to manually switch valves and adjust measuring instruments. Later, it evolved into DSC manual operation mode for some equipment, and gradually formed A specific precipitated silica production industry. Personnel operation is closely related to the quality stability of chemical products. Precipitated silica chemical products are currently widely used in various fields. Due to their small particle size, they show some unique properties and are widely used as rubber reinforcing agents. , plastic filler, paper sizing agent and strengthening agent, toothpaste friction agent, paint and ink matting agent and thickener, pesticide carrier and anti-caking agent, etc. The addition of high-performance nano-silica in the rubber industry can significantly improve the physical and chemical properties of the rubber compound, such as hardness, tear resistance, and wear resistance: using it to make tires can reduce the rolling resistance of the tire, and the wet skid resistance has no effect. Influence; adding to ink, paint and coating can make the color of the pigment brighter and the paint film is stable and not easy to fall off; adding to the plastic industry can improve the strength, toughness, waterproof performance and aging resistance of the plastic; adding to the paper industry can improve The whiteness of paper makes the paper lighter and more suitable for printing at high speed; adding to pesticides can improve the absorption and spreading ability of pesticides; adding to composite products such as ceramics can improve the hardness, wear resistance, Properties such as toughness, smoothness and thermal fatigue.

Process parameters and process control are the two core technologies of the entire production process in the reaction production of nano-scale precipitated silica. The reaction process requires the production of production equipment (various pumps, valves, measuring instruments, and testing instruments) Monitoring, adjustment and control, but due to human factors, equipment factors, raw material factors and information collection and other reasons, it is difficult to effectively and accurately control the process parameters in the process, resulting in the actual material reaction process and the process parameters are not the same, resulting in The production quality cannot be guaranteed, so the invention of an intelligent monitoring and control device suitable for the reaction process of nano-scale silica in the precipitation method is a great progress in fine chemical production.

Contents of the invention

The technical problem to be solved by the present invention is to provide an intelligent control method for the reaction process of precipitated silica, realize the continuous and automatic production of precipitated silica, and enable automatic adjustment and precise control of various process parameters in the process.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

An intelligent control method for the reaction process of precipitated silica, based on a control device;

The control device includes: concentrated sulfuric acid storage tank, diluted water tank, concentrated sodium silicate storage tank, steam tank, dilute sulfuric acid storage tank, dilute sodium silicate storage tank, hot water storage tank, concentrated alkali storage tank, reaction tank and unloading tank;

The discharge end of the concentrated sulfuric acid storage tank is connected to the feed end of the dilute sulfuric acid storage tank through a first connecting pipe;

The discharge end of the concentrated sulfuric acid storage tank is connected with the feed end of the reaction tank through an eleventh connecting pipe;

The discharge end of the dilution water tank is connected with the feed end of the dilute sulfuric acid storage tank through a second connecting pipe;

The discharge end of the concentrated sodium silicate storage tank is connected with the feed end of the dilute sodium silicate storage tank through a third connecting pipe;

The discharge end of the dilution water tank is connected with the feed end of the diluted sodium silicate storage tank through the fourth connecting pipe;

The discharge end of the dilute sulfuric acid storage tank is connected to the feed end of the reaction tank through a fifth connecting pipe;

The discharge end of the dilute sodium silicate tank is connected with the feed end of the reaction tank through the sixth connecting pipe;

The discharge end of the steam tank is connected with the feed end of the reaction tank through the seventh connecting pipe;

The discharge end of the hot water storage tank is connected to the feed end of the reaction tank through an eighth connecting pipe;

The discharge end of the concentrated alkali storage tank is connected with the feed end of the reaction tank through the ninth connecting pipe;

The discharge end of the reaction tank is connected to the feed end of the discharge tank through the tenth connecting pipe;

The first connecting pipe is connected with a first liquid pump, a first electric control valve and a first flow meter;

The second connecting pipe is connected with a second liquid pump, a second electric control valve and a second flow meter;

The third connecting pipe is connected with a third liquid pump, a third electric control valve and a third flow meter;

The fourth connecting pipe is connected with a fourth liquid pump, a fourth electric control valve and a fourth flowmeter;

The fifth connecting pipe is connected with a fifth liquid pump, a fifth electric control valve and a fifth flowmeter;

The sixth connecting pipe is connected with a sixth liquid pump, a sixth electric control valve and a sixth flowmeter;

The seventh connecting pipe is connected with a seventh liquid pump, a seventh electric control valve and a seventh flow meter;

The eighth connecting pipe is connected with an eighth liquid pump, an eighth electric control valve, and an eighth flowmeter;

The ninth connecting pipe is connected with a ninth liquid pump, a ninth electric control valve and a ninth flowmeter;

The tenth connecting pipe is connected with a tenth liquid pump, a tenth electric control valve and a tenth flow meter;

The eleventh connecting pipe is connected with the twelfth liquid pump, the twelfth electric control valve and the eleventh flow meter;

The dilute sulfuric acid storage tank is provided with a first liquid level monitor; the dilute sulfuric acid storage tank is connected with a first stirring motor;

The dilute sodium silicate storage tank is provided with a second liquid level monitor; the dilute sodium silicate storage tank is connected with a second stirring motor;

The reaction tank is provided with a temperature detector, a pH detector, and a third liquid level monitor;

Also includes a DSC, the DSC is respectively connected with the first liquid pump, the first electric control valve, the first flow meter, the second liquid pump, the second electric control valve, the second flow meter, the third liquid pump, the third electric control valve, the third flow meter, the fourth liquid pump, the fourth electric control valve, the fourth flow meter, the fifth liquid pump, the fifth electric control valve, the fifth flow meter, the sixth liquid pump, the sixth electric control valve, The sixth flow meter, the seventh liquid pump, the seventh electric control valve, the seventh flow meter, the eighth liquid pump, the eighth electric control valve, the eighth flow meter, the ninth liquid pump, the ninth electric control valve, the ninth Flow meter, tenth liquid pump, tenth electric control valve, tenth flow meter, twelfth liquid pump, twelfth electric control valve, eleventh flow meter, first liquid level monitor, second liquid level monitor Instrument, temperature detector, conductivity detector, pH detector, the third liquid level monitor, the first stirring motor, the second stirring motor and the third stirring motor are electrically connected;

Described control method comprises the following steps:

Step 1: DSC controls the opening of the first liquid pump, the first electric control valve, the first flow meter, the second liquid pump, the second electric control valve, and the second flow meter, and the concentrated sulfuric acid in the concentrated sulfuric acid storage tank is The sulfuric acid and the water in the dilution water tank are pumped into the dilute sulfuric acid storage tank to mix; until the first liquid level monitor detects that the liquid level in the dilute sulfuric acid storage tank reaches the preset threshold value H, control the first liquid pump, the first electrical The control valve, the second liquid pump and the second electric control valve are closed;

At the same time, the DSC controls the opening of the third liquid pump, the third electric control valve, the third flow meter, the fourth liquid pump, the fourth electric control valve, and the fourth flow meter, and discharges the concentrated sodium silicate storage tank according to the preset ratio. The concentrated sodium silicate and the water in the dilution water tank are pumped into the dilute sodium silicate storage tank and mixed; until the second liquid level monitor detects that the liquid level in the dilute sodium silicate storage tank reaches the preset threshold value H, control The third liquid pump, the third electric control valve, the fourth liquid pump and the fourth electric control valve are closed;

Step 2: According to the real-time flow values monitored by the first flowmeter, the second flowmeter, the third flowmeter, and the fourth flowmeter, the DSC calculates the cumulative feeding volume of concentrated sulfuric acid and water in the dilute sulfuric acid storage tank, respectively, and calculates the dilute silicon Calculate the cumulative feeding volume of concentrated sodium silicate and water in the sodium silicate storage tank, respectively calculate the error between each cumulative feeding volume and the preset value; judge whether the error is within the preset threshold range; if the above errors exceed the preset threshold range, Then selectively open the first liquid pump, the second liquid pump, the third liquid pump or the fourth liquid pump according to the error value, and correspondingly selectively open the first electric control valve, the second electric control valve, the third electric control valve or The fourth electric control valve, until the above error value reaches the preset threshold range, close the corresponding electric control valve and liquid pump;

DSC controls the first stirring motor and the second stirring motor to continue stirring for the preset process time, and then stop stirring;

Step 3: DSC controls the fifth liquid pump, the fifth electric control valve, the fifth flow meter, the sixth liquid pump, the sixth electric control valve, the sixth flow meter, the eighth liquid pump, the eighth electric control valve, the eighth The flow meter is turned on, and the dilute sulfuric acid, dilute sodium silicate, and hot water are pumped into the reaction tank according to the preset ratio and mixed; until the third liquid level monitor monitors that the liquid level in the reaction tank reaches the preset threshold H level, it is closed The fifth liquid pump, the fifth electric control valve, the sixth liquid pump, the sixth electric control valve, the eighth liquid pump, and the eighth electric control valve;

Step 4: According to the real-time flow values monitored by the fifth flowmeter, the sixth flowmeter and the eighth flowmeter, the DSC calculates the cumulative feeding volume of dilute sulfuric acid, dilute sodium silicate and hot water in the reaction tank respectively, and calculates the cumulative feeding volume of each cumulative feeding volume respectively. The error between the volume and the preset value; judging whether the error is within the preset threshold range; if the above error exceeds the preset threshold range, selectively open the fifth electric control valve, the sixth electric control valve or the eighth electric control valve , correspondingly selectively turn on the fifth liquid pump, the sixth liquid pump and the eighth liquid pump, until the above error value reaches the preset threshold range, close the corresponding electric control valve and liquid pump;

Step 5: The DSC controls the third stirring motor to continue stirring; during the stirring process, the DSC controls the opening of the seventh liquid pump, the seventh electric control valve and the seventh flow meter according to the temperature value in the reaction tank detected by the temperature detector, Steam is introduced into the tank until the temperature of the reaction tank reaches the preset value, and the seventh liquid pump and the seventh electric control valve are closed; during the stirring process, the DSC detects the pH value in the reaction tank according to the pH detector, and controls the ninth liquid. Open the pump, the ninth electric control valve and the ninth flowmeter or control the opening of the twelfth liquid pump, the twelfth electric control valve and the eleventh flowmeter, and feed concentrated alkali or concentrated sulfuric acid into the reaction tank until the reaction tank When the pH value reaches the preset value, turn off the ninth liquid pump and the ninth electric control valve;

Step 6: DSC controls the third stirring motor to continue stirring for a preset time, then stops stirring, controls the opening of the seventh liquid pump, the seventh electric control valve and the seventh flow meter, and completely discharges the materials in the reaction tank to the discharge tank .

Further, in the above-mentioned intelligent control method of the precipitation silica reaction process, the control device also includes a filter press, and a turbidity detector is installed in the dilute sodium silicate storage tank, and the dilute sodium silicate storage tank The discharge end of the filter press is connected to the feed end of the filter press through a pipeline, and the discharge end of the filter press is connected to the feed end of the dilute sodium silicate storage tank through a pipeline. The pipeline is equipped with an eleventh electric control valve and the eleventh liquid pump, the eleventh electric control valve and the eleventh liquid pump are respectively electrically connected to the DSC;

In the control method, after step 2, between step 3, step 21 is also included: DSC judges whether the error is Within the preset threshold range; if not, then control the eleventh electric control valve and the eleventh liquid pump to open, so that the liquid in the dilute sodium silicate tank is filtered by the filter press and then returned to the dilute sodium silicate storage tank. In the tank, this cycle is performed until the error is within the preset threshold range, and the eleventh electric control valve and the eleventh liquid pump are controlled to be closed.

Further, in the above-mentioned intelligent control method of the precipitation silica reaction process, in the control device, a first concentration detector is provided in the dilute sulfuric acid storage tank, and the first concentration detector is electrically connected to the DSC ;

In the control method, in the step 2, it further includes: DSC judges whether the error is within the preset threshold range according to the error between the concentration value in the dilute sulfuric acid storage tank detected by the first concentration detector and the preset value, If not, selectively open the first liquid pump or the second liquid pump, and selectively open the first electric control valve or the second electric control valve accordingly, until the above error value reaches the preset threshold range, then close the corresponding electric valve. control valves and liquid pumps.

Further, in the above-mentioned intelligent control method of the precipitation silica reaction process, in the control device, a second concentration detector is provided in the dilute sodium silicate storage tank, and the second concentration detector and the DSC electrical connection;

In the control method, in the step 2, it also includes: DSC judges whether the error is within the preset threshold range according to the error between the concentration value in the dilute sodium silicate storage tank detected by the second concentration detector and the preset value If not, then selectively open the third liquid pump or the fourth liquid pump, and selectively open the third electric control valve or the fourth electric control valve accordingly, until the above error value reaches the preset threshold range, close the corresponding electronically controlled valves and liquid pumps.

Further, in the above-mentioned intelligent control method of the precipitation silica reaction process, the thresholds in the dilute sulfuric acid storage tank include L, M, and H from low to high, and when the liquid level in the dilute sulfuric acid storage tank is lower than the threshold L , the first stirring motor rotates at the first stirring speed, when the liquid level in the dilute sulfuric acid storage tank is between the threshold L and M, the first stirring motor rotates at the second stirring speed, when the liquid level in the dilute sulfuric acid storage tank When between the thresholds M and H, the first stirring motor rotates at a third stirring speed, and the rotational speed ratio of the first stirring speed, the second stirring speed and the third stirring speed is 3:4:5.

Further, in the intelligent control method of the above-mentioned precipitated silica reaction process, the thresholds in the dilute sodium silicate storage tank include L, M, and H from low to high, when the liquid level in the dilute sodium silicate storage tank When it is lower than the threshold L, the second stirring motor rotates at the first stirring speed. When the liquid level in the dilute sodium silicate storage tank is between the threshold L and M, the second stirring motor rotates at the second stirring speed. When the liquid level in the dilute sodium silicate storage tank is between the threshold M and H, the second stirring motor rotates at the third stirring speed, and the rotation speed ratio of the first stirring speed, the second stirring speed and the third stirring speed is It is 3:4:5.

Further, in the intelligent control method of the above-mentioned precipitated silica reaction process, the thresholds in the reaction tank include L, M, and H from low to high. When the liquid level in the reaction tank is lower than the threshold L, the third stirring The motor rotates at the first stirring speed. When the liquid level in the reaction tank is between the thresholds L and M, the third stirring motor rotates at the second stirring speed. When the liquid level in the reaction tank is between the thresholds M and H , the third stirring motor rotates at a third stirring speed, and the rotational speed ratio of the first stirring speed, the second stirring speed and the third stirring speed is 3:4:5.

Further, in the intelligent control method of the above-mentioned precipitated silica reaction process, in the step 1, it also includes: DSC according to the real-time flow values of the first flowmeter, the second flowmeter, the third flowmeter and the fourth flowmeter Using the PID algorithm to adjust the opening degrees of the first electric control valve, the second electric control valve, the third electric control valve and the fourth electric control valve in real time according to the difference with the preset flow value;

In the step 3, it also includes: the DSC adjusts the fifth electric control valve, The opening degrees of the sixth electric control valve and the eighth electric control valve;

In the step 5, it also includes: according to the difference between the real-time flow value of the seventh flow meter and the ninth flow meter and the preset flow value, the DSC uses the PID algorithm to adjust the seventh electric control valve and the ninth electric control valve in real time of the opening.

Further, in the intelligent control method of the above-mentioned precipitated silica reaction process, in the control method, when the third liquid level monitor monitors that the material in the reaction tank is emptied, repeat step 3, when the first liquid level monitor When the second liquid level monitor monitors that the liquid level in the dilute sodium silicate storage tank is lower than H, repeat step 1.

The beneficial effect of the present invention is that: in the intelligent control method of the precipitated silica reaction process involved in the present invention, a specific control device is designed for the precipitated silica reaction process, including various storage tanks, pipeline connections and various The relationship between the connection positions of pumps, valves, and measuring instruments, and design a specific control method based on these control devices, and write the corresponding control program of the control method design into the DSC. Connection to realize the continuous automatic production of continuous silica in the precipitation silica reaction process, so that various process parameters in the process can be automatically adjusted and precisely controlled.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a control device involved in an intelligent control method of a precipitated silica reaction process according to a specific embodiment of the present invention;

Fig. 2 is a block diagram of the partial structure of the dilute sulfuric acid storage tank of the control device involved in the intelligent control method of the precipitation silica reaction process according to the specific embodiment of the present invention;

Fig. 3 is a block diagram of the partial structure of the dilute sodium silicate storage tank of the control device involved in the intelligent control method of the precipitation silica reaction process according to the specific embodiment of the present invention;

Fig. 4 is a block diagram of the partial structure of the reaction tank of the control device involved in the intelligent control method of the precipitation silica reaction process according to the specific embodiment of the present invention;

Label description:

1. Concentrated sulfuric acid storage tank; 11. The first connecting pipe; 12. The first liquid pump; 13. The first electric control valve; 14. The first flow meter; 15. The eleventh connecting pipe; 16. The twelfth liquid Pump; 17. The twelfth electric control valve; 18. The eleventh flow meter;

2. Dilution water tank; 21. Second connecting pipe; 22. Fourth connecting pipe; 23. Second liquid pump; 24. Second electric control valve; 25. Second flow meter; 26. Fourth liquid pump; 27 , the fourth electric control valve; 28, the fourth flow meter;

3. Concentrated sodium silicate storage tank; 31. The third connecting pipe; 32. The third liquid pump; 33. The third electric control valve; 34. The third flow meter;

4. Steam tank; 41. The seventh connecting pipe; 42. The seventh liquid pump; 43. The seventh electric control valve; 44. The seventh flow meter;

5. Dilute sulfuric acid storage tank; 51. The fifth connecting pipe; 52. The fifth liquid pump; 53. The fifth electric control valve; 54. The fifth flow meter; 55. The first liquid level monitor; 56. The first stirring Motor; 57. The first concentration detector;

6. Dilute sodium silicate storage tank; 61. The sixth connecting pipe; 62. The sixth liquid pump; 63. The sixth electric control valve; 64. The sixth flow meter; 65. The second liquid level monitor; 66. The sixth 2. Stirring motor; 67. Filter press; 68. Turbidity detector; 69. Pipeline; 610. Eleventh electric control valve; 611. Eleventh liquid pump; 612. Second concentration detector;

7. Hot water storage tank; 71. The eighth connecting pipe; 72. The eighth liquid pump; 73. The eighth electric control valve; 74. The eighth flow meter;

8. Concentrated alkali storage tank; 81. The ninth connecting pipe; 82. The ninth liquid pump; 83. The ninth electric control valve; 84. The ninth flow meter;

9. Reaction tank; 91. The tenth connecting pipe; 92. The tenth liquid pump; 93. The tenth electric control valve; 94. The tenth flow meter; 95. The pH detector; 96. The third liquid level monitor;

10. Unloading tank.

Detailed ways

In order to describe the technical content, achieved goals and effects of the present invention in detail, the following descriptions will be made in conjunction with the embodiments and accompanying drawings.

Please refer to Fig. 1 to Fig. 4, the specific embodiment of the present invention relates to an intelligent control method for the precipitation silica reaction process, based on the control device;

The control device includes: concentrated sulfuric acid storage tank 1, dilution water tank 2, concentrated sodium silicate storage tank 3, steam tank 4, dilute sulfuric acid storage tank 5, dilute sodium silicate storage tank 6, hot water storage tank 7, concentrated Alkali storage tank 8, reaction tank 9 and discharge tank 10;

The discharge end of the concentrated sulfuric acid storage tank 1 is connected with the feed end of the dilute sulfuric acid storage tank 5 through a first connecting pipe 11;

The discharge end of the concentrated sulfuric acid storage tank 1 is connected with the feed end of the reaction tank 9 through the eleventh connecting pipe 15;

The discharge end of the dilution water tank 2 is connected with the feed end of the dilute sulfuric acid storage tank 5 through a second connecting pipe 21;

The discharge end of described concentrated sodium silicate storage tank 3 is connected with the feed end of described dilute sodium silicate storage tank 6 by the 3rd connecting pipe 31;

The discharge end of described dilution water tank 2 is connected with the feed end of described dilute sodium silicate storage tank 6 by the 4th connecting pipe 22;

The discharge end of the dilute sulfuric acid storage tank 5 is connected with the feed end of the reaction tank 9 through the fifth connecting pipe 51;

The discharge end of described dilute sodium silicate tank is connected with the feed end of described reaction tank 9 by the 6th connecting pipe 61;

The discharge end of the steam tank 4 is connected with the feed end of the reaction tank 9 through the seventh connecting pipe 41;

The discharge end of the hot water storage tank 7 is connected with the feed end of the reaction tank 9 through the eighth connecting pipe 71;

The discharge end of the concentrated alkali storage tank 8 is connected with the feed end of the reaction tank 9 through the ninth connecting pipe 81;

The discharge end of the reaction tank 9 is connected with the feed end of the discharge tank 10 through the tenth connecting pipe 91;

The first connecting pipe 11 is connected with a first liquid pump 12, a first electric control valve 13 and a first flow meter 14;

The second connecting pipe 21 is connected with a second liquid pump 23, a second electric control valve 24 and a second flow meter 25;

The third connecting pipe 31 is connected with a third liquid pump 32, a third electric control valve 33 and a third flow meter 34;

The fourth connecting pipe 22 is connected with a fourth liquid pump 26, a fourth electric control valve 27 and a fourth flow meter 28;

The fifth connecting pipe 51 is connected with a fifth liquid pump 52, a fifth electric control valve 53 and a fifth flow meter 54;

The sixth connecting pipe 61 is connected with a sixth liquid pump 62, a sixth electric control valve 63 and a sixth flow meter 64;

The seventh connecting pipe 41 is connected with a seventh liquid pump 42, a seventh electric control valve 43 and a seventh flow meter 44;

The eighth connecting pipe 71 is connected with an eighth liquid pump 72, an eighth electric control valve 73 and an eighth flowmeter 74;

The ninth connecting pipe 81 is connected with a ninth liquid pump 82 , a ninth electric control valve 83 and a ninth flowmeter 84 ;

The tenth connecting pipe 91 is connected with a tenth liquid pump 92, a tenth electric control valve 93 and a tenth flowmeter 94;

The eleventh connecting pipe 15 is connected with a twelfth liquid pump 16, a twelfth electric control valve 17 and an eleventh flow meter 18;

The dilute sulfuric acid storage tank 5 is provided with a first liquid level monitor 55; the dilute sulfuric acid storage tank 5 is connected with a first stirring motor 56;

The dilute sodium silicate storage tank 6 is provided with a second liquid level monitor 65; the dilute sodium silicate storage tank 6 is connected with a second stirring motor 66;

The reaction tank 9 is provided with a temperature detector, a pH detector 95, and a third liquid level monitor 96;

Also includes a DSC, the DSC is respectively connected with the first liquid pump 12, the first electric control valve 13, the first flow meter 14, the second liquid pump 23, the second electric control valve 24, the second flow meter 25, the third liquid Pump 32, third electric control valve 33, third flow meter 34, fourth liquid pump 26, fourth electric control valve 27, fourth flow meter 28, fifth liquid pump 52, fifth electric control valve 53, fifth Flow meter 54, sixth liquid pump 62, sixth electric control valve 63, sixth flow meter 64, seventh liquid pump 42, seventh electric control valve 43, seventh flow meter 44, eighth liquid pump 72, eighth Electric control valve 73, eighth flow meter 74, ninth liquid pump 82, ninth electric control valve 83, ninth flow meter 84, tenth liquid pump 92, tenth electric control valve 93, tenth flow meter 94, Twelfth liquid pump 16, twelfth electric control valve 17, eleventh flow meter 18, first liquid level monitor 55, second liquid level monitor 65, temperature detector, conductivity detector, pH detector 95 , the third liquid level monitor 96, the first stirring motor 56, the second stirring motor 66 and the third stirring motor are electrically connected;

Described control method comprises the following steps:

Step 1: DSC controls the opening of the first liquid pump 12, the first electric control valve 13, the first flow meter 14, the second liquid pump 23, the second electric control valve 24, and the second flow meter 25, and the concentrated The concentrated sulfuric acid in the sulfuric acid storage tank 1 and the water in the dilution water tank 2 are pumped into the dilute sulfuric acid storage tank 5 for mixing; until the first liquid level monitor 55 detects that the liquid level in the dilute sulfuric acid storage tank 5 reaches the preset threshold value H , control the first liquid pump 12, the first electric control valve 13, the second liquid pump 23, and the second electric control valve 24 to close;

At the same time, the DSC controls the opening of the third liquid pump 32, the third electric control valve 33, the third flow meter 34, the fourth liquid pump 26, the fourth electric control valve 27, and the fourth flow meter 28, and the concentrated silicon The concentrated sodium silicate in the sodium silicate storage tank 3 and the water in the dilution water tank 2 are pumped into the diluted sodium silicate storage tank 6 and mixed; until the second liquid level monitor 65 monitors the liquid in the diluted sodium silicate storage tank 6 When the position reaches the preset threshold H position, control the third liquid pump 32, the third electric control valve 33, the fourth liquid pump 26, and the fourth electric control valve 27 to close;

Step 2: According to the real-time flow values monitored by the first flowmeter 14, the second flowmeter 25, the third flowmeter 34, and the fourth flowmeter 28, the DSC calculates the cumulative feeding volumes of concentrated sulfuric acid and water in the dilute sulfuric acid storage tank 5 respectively , respectively calculate the accumulative feeding volume of concentrated sodium silicate and water in dilute sodium silicate storage tank 6, and calculate the error between each accumulative feeding volume and the preset value respectively; judge whether the error is within the preset threshold range; if the above errors exceed According to the preset threshold range, the first liquid pump 12, the second liquid pump 23, the third liquid pump 32 or the fourth liquid pump 26 are selectively opened according to the error value, and the first electric control valve 13, the The second electric control valve 24, the third electric control valve 33 or the fourth electric control valve 27, until the above error value reaches the preset threshold range, close the corresponding electric control valve and liquid pump;

After the DSC controls the first stirring motor 56 and the second stirring motor 66 to continue stirring for the preset process time, the stirring is stopped;

Step 3: DSC controls the fifth liquid pump 52, the fifth electric control valve 53, the fifth flow meter 54, the sixth liquid pump 62, the sixth electric control valve 63, the sixth flow meter 64, the eighth liquid pump 72, the The eighth electric control valve 73 and the eighth flowmeter 74 are opened, and the dilute sulfuric acid, dilute sodium silicate, and hot water are pumped into the reaction tank 9 according to the preset ratio and mixed; When the liquid level reaches the preset threshold value H, close the fifth liquid pump 52, the fifth electric control valve 53, the sixth liquid pump 62, the sixth electric control valve 63, the eighth liquid pump 72, and the eighth electric control valve 73 ;

Step 4: According to the real-time flow values monitored by the fifth flowmeter 54, the sixth flowmeter 64 and the eighth flowmeter 74, the DSC calculates the cumulative feeding volumes of dilute sulfuric acid, dilute sodium silicate and hot water in the reaction tank 9 respectively, respectively Calculate the error between the cumulative feeding volume and the preset value; judge whether the error is within the preset threshold range; if the above error exceeds the preset threshold range, selectively open the fifth electric control valve 53 and the sixth electric control valve 63 Or the eighth electric control valve 73, correspondingly selectively open the fifth liquid pump 52, the sixth liquid pump 62 and the eighth liquid pump 72, until the above error value reaches the preset threshold range, close the corresponding electric control valve and Liquid pump;

Step 5: The DSC controls the third stirring motor to continue stirring; during the stirring process, the DSC controls the seventh liquid pump 42, the seventh electric control valve 43 and the seventh flowmeter 44 according to the temperature value in the reaction tank 9 detected by the temperature detector Open, feed steam into the reaction tank 9, until the temperature of the reaction tank 9 reaches the preset value, close the seventh liquid pump 42 and the seventh electric control valve 43; during the stirring process, the DSC detects the reaction tank according to the pH detector 95 pH value within 9, control the ninth liquid pump 82, the ninth electric control valve 83 and the ninth flow meter 84 to open or control the twelfth liquid pump 16, the twelfth electric control valve 17 and the eleventh flow meter 18 to open , feed concentrated alkali or concentrated sulfuric acid into the reaction tank 9 until the pH value of the reaction tank 9 reaches a preset value, and close the ninth liquid pump 82 and the ninth electric control valve 83;

Step 6: After the DSC controls the third stirring motor to continue stirring for a preset time, stop the stirring, control the opening of the seventh liquid pump 42, the seventh electric control valve 43 and the seventh flow meter 44, and completely discharge the materials in the reaction tank 9 To discharge tank 10.

In the above embodiments, it should be noted that the preset threshold H level can be 80% of the corresponding storage tank capacity, and the high liquid level HH can also be preset, and the HH level can be set to 100% of the corresponding storage tank capacity Liquid level or close to capacity 100% liquid level, in step 1, take dilute sulfuric acid storage tank 5 as example, when the liquid level in dilute sulfuric acid storage tank 5 reaches 80% of capacity, stop feeding in the tank, in step 2, to The separate feeding volumes of concentrated sulfuric acid and water are rechecked. If there is a deviation in the feeding amount, the corresponding electric control valve and liquid pump will be opened by controlling to make the ratio of concentrated sulfuric acid and water reach the preset state accurately. Although during the feeding process, The electric control valve can control the flow of concentrated sulfuric acid and water in real time according to the PID algorithm of DSC. However, in the process of continuous feeding, there will still be errors in the ratio of water to concentrated sulfuric acid. Through the review mechanism of step 2, the dilute sulfuric acid storage tank can be further improved. The precise preparation of dilute sulfuric acid concentration within 5, and before the recheck, the liquid level is controlled at 80% of the capacity, which also provides a 20% capacity space for the rechecked feeding adjustment, which is enough for the subsequent rechecked feeding adjustment; the subsequent feeding adjustment process Among them, the liquid level in the dilute sulfuric acid storage tank 5 generally does not reach the HH level. If it reaches the HH level, it means that the system fails, and the DSC is triggered to send an alarm signal, and the corresponding feed valve and liquid pump are closed; the dilute sodium silicate The liquid level control and review mechanism of the storage tank 6 and the reaction tank 9 are the same as those of the dilute sulfuric acid storage tank 5, and will not be repeated here.

After the concentration of dilute sulfuric acid and dilute sodium silicate reaches the preset value accurately, the feeding and stirring into the reaction tank 9 are automatically controlled, the temperature in the reaction tank 9 is adjusted by feeding steam, and the pH of the reaction product is adjusted by feeding concentrated alkali The value is generally adjusted to 6.5. After the reaction is completed, the material in the reaction tank 9 needs to be completely emptied to the discharge tank 10, and then the third liquid level monitor 96 monitors that after the liquid in the reaction tank 9 is emptied, the DSC receives the signal and controls the corresponding electronic control The valve and the liquid pump are opened, and the reaction tank 9 carries out the next round of feeding and stirring reaction, so as to realize the continuity of the automatic control of the production process.

As an optional embodiment, the control device also includes a filter press 67, a turbidity detector 68 is arranged in the dilute sodium silicate storage tank 6, and the discharge of the dilute sodium silicate storage tank 6 end is connected with the feed end of the filter press 67 through a pipeline 69, and the discharge end of the filter press 67 is connected with the feed end of the dilute sodium silicate storage tank 6 through a pipeline 69, and the pipeline 69 is provided with a tenth An electric control valve 610 and an eleventh liquid pump 611, the eleventh electric control valve 610 and the eleventh liquid pump 611 are respectively electrically connected to the DSC;

In the control method, after step 2, between step 3, step 21 is also included: DSC judges according to the error between the turbidity value in the dilute sodium silicate storage tank 6 detected by the turbidity detector 68 and the preset value Whether the error is within the preset threshold range; if not, then control the eleventh electric control valve 610 and the eleventh liquid pump 611 to open, so that the liquid in the dilute sodium silicate tank is refluxed to The dilute sodium silicate storage tank 6 is circulated until the error is within the preset threshold range, and the eleventh electric control valve 610 and the eleventh liquid pump 611 are controlled to be closed.

In the above embodiment, in the preparation process of dilute sodium silicate, impurities may be easily produced. By adding a filter press 67, and adding a turbidity detector 68 in the dilute sodium silicate storage tank 6, the DSC according to the turbidity detector 68, control the eleventh electric control valve 610 and the eleventh liquid pump 611 to open, so that the liquid in the dilute sodium silicate storage tank 6 passes through the filter press 67 and circulates back into the dilute sodium silicate storage tank 6, When the turbidity reaches the preset range, the feed is fed into the subsequent reaction tank 9 .

As an optional implementation, in the control device, the dilute sulfuric acid storage tank 5 is provided with a first concentration detector 57, and the first concentration detector 57 is electrically connected to the DSC;

In the control method, in the step 2, it also includes: DSC judges whether the error is within the preset threshold range according to the error between the concentration value in the dilute sulfuric acid storage tank 5 detected by the first concentration detector 57 and the preset value If not, then selectively open the first liquid pump 12 or the second liquid pump 23, and selectively open the first electric control valve 13 or the second electric control valve 24 accordingly, until the above error value reaches the preset threshold range Inside, close the corresponding electric control valve and liquid pump.

In the review of step 2, the error value of the concentration of the dilute sulfuric acid storage tank 5 is rechecked by the first concentration detector 57, and the cumulative feeding volume of the corresponding flowmeter can be used to more accurately measure the dilute sulfuric acid concentration in the dilute sulfuric acid storage tank 5. Adjust to make it reach the preset value more accurately.

As an optional implementation, in the control device, the dilute sodium silicate storage tank 6 is provided with a second concentration detector 612, and the second concentration detector 612 is electrically connected to the DSC;

In the control method, in the step 2, it also includes: DSC judges whether the error is within the preset value according to the error between the concentration value in the dilute sodium silicate storage tank 6 detected by the second concentration detector 612 and the preset value. Within the threshold range, if not, then selectively open the third liquid pump 32 or the fourth liquid pump 26, and selectively open the third electric control valve 33 or the fourth electric control valve 27 accordingly, until the above error value reaches the preset value. Within the threshold range, close the corresponding electric control valve and liquid pump.

In the review of step 2, the error value of the concentration of the dilute sodium silicate storage tank 6 is rechecked by the second concentration detector 612, and the cumulative feeding volume of the corresponding flowmeter can be used to more accurately measure the concentration of the dilute sodium silicate storage tank 6. The concentration of dilute sodium silicate is adjusted to make it more accurately reach the preset value.

As an optional implementation, the thresholds in the dilute sulfuric acid storage tank 5 include L, M, and H from low to high. When the liquid level in the dilute sulfuric acid storage tank 5 is lower than the threshold L, the first stirring motor 56 rotates with the first stirring speed, when the liquid level in the dilute sulfuric acid storage tank 5 is between the threshold value L and M, the first stirring motor 56 rotates with the second stirring speed, when the liquid level in the dilute sulfuric acid storage tank 5 is at When the thresholds M and H are between, the first stirring motor 56 rotates at the third stirring speed, and the rotation ratio of the first stirring speed, the second stirring speed and the third stirring speed is 3:4:5.

As an optional implementation, the thresholds in the dilute sodium silicate storage tank 6 include L, M, and H from low to high, and when the liquid level in the dilute sodium silicate storage tank 6 is lower than the threshold L , the second stirring motor 66 rotates at the first stirring speed. When the liquid level in the dilute sodium silicate storage tank 6 is between the threshold L and M, the second stirring motor 66 rotates at the second stirring speed. When the liquid level in the sodium silicate storage tank 6 was between the threshold value M and H, the second stirring motor 66 rotated at a third stirring speed, and the ratio of the rotational speed of the first stirring speed, the second stirring speed and the third stirring speed It is 3:4:5.

As an optional implementation, the thresholds in the reaction tank 9 include L, M, and H from low to high. When the liquid level in the reaction tank 9 is lower than the threshold L, the third stirring motor will stir with the first speed rotation, when the liquid level in the reaction tank 9 was between the threshold L and M, the third stirring motor rotated at the second stirring speed, and when the liquid level in the reaction tank 9 was between the threshold M and H, the third The stirring motor rotates at a third stirring speed, and the rotational speed ratio of the first stirring speed, the second stirring speed and the third stirring speed is 3:4:5.

In the above embodiment, the dilute sulfuric acid storage tank 5, the dilute sodium silicate storage tank 6 and the reaction tank 9 all relate to three thresholds according to the liquid level height in the tank, and design the three-stage agitation speed according to the liquid level in the tank, and the reaction tank 9 as an example, for example, at the first speed, the frequency of the third stirring motor can be 30HZ; at the second speed, the frequency of the third stirring motor is 40HZ; at the third speed, the frequency of the third stirring motor is 50HZ.

Preferably, 5 threshold liquid levels can be set from low to high in the reaction tank 9, namely LL, L, M, H, HH, LL is 0% of the volume of the reaction tank 9, and HH is 100% of the volume of the reaction tank 9. At LL, the DSC controls feeding in proportion to the reaction tank 9, and at HH, the DSC sends out a corresponding alarm, and controls the electronically controlled valves and liquid pumps at the feed end of the reaction tank 9 to close.

As an optional implementation, in the step 1, it also includes: DSC according to the real-time flow value and preset Using the PID algorithm to adjust the opening degrees of the first electric control valve 13, the second electric control valve 24, the third electric control valve 33 and the fourth electric control valve 27 in real time;

In the step 3, it also includes: the DSC uses the PID algorithm to adjust the fifth flow rate in real time according to the difference between the real-time flow value of the fifth flow meter 54, the sixth flow meter 64, and the eighth flow meter 74 and the preset flow value. The opening degrees of the control valve 53, the sixth electric control valve 63, and the eighth electric control valve 73;

In the step 5, it also includes: the DSC uses the PID algorithm to adjust the seventh electric control valve 43 and the ninth flow meter in real time according to the difference between the real-time flow value of the seventh flow meter 44 and the ninth flow meter 84 and the preset flow value. The opening degree of the electric control valve 83.

In the above embodiment, the DSC automatically adjusts the opening of each valve according to the flow meter signal through the PID algorithm, so that the flow control is within the preset range. Since the PID algorithm is a prior art, the present invention does not change the PID specific algorithm, so , the specific algorithm principle will not be repeated here.

As an optional implementation, in the control method, when the third liquid level monitor 96 monitors that the material in the reaction tank 9 is emptied, repeat step 3, and when the first liquid level monitor 55 detects that the The liquid level in the sulfuric acid storage tank 5 is lower than H, or when the second liquid level monitor 65 detects that the liquid level in the dilute sodium silicate storage tank 6 is lower than H, then repeat step 1.

In the above embodiment, the emptying of the material in the reaction tank 9 can be realized according to the preset liquid level threshold LL position, and the LL position is the liquid level at which the volume of the reaction tank 9 is 0%, and the threshold value is used as the trigger DSC to control the flow into the reaction tank 9. The trigger signal for the opening of the corresponding electric control valve and liquid pump for feeding.

In the above embodiments, multi-level material ratio tables, multi-process inspection standards and material adjustment schemes can be designed according to different primary formulas, and various semi-finished production instructions and processes can be automatically generated and issued according to the selected primary production formulas When it is necessary to adjust the quality of materials, the system intelligently compares the adjustment plan and produces adjustment instructions. When the material in the reaction tank 9 is emptied, the corresponding formula and production batch can be selected for the next reaction in the reaction tank 9. of feeding.

Taking the dilute sulfuric acid storage tank 5 as an example, since the liquid level of the dilute sulfuric acid storage tank 5 is controlled near the H level, when the dilute sulfuric acid in the dilute sulfuric acid storage tank 5 is fed into the reaction tank 9, the liquid level will be lower than the H level. can trigger DSC to control the corresponding electric control valve and liquid pump to open, and feed concentrated sulfuric acid and water into the dilute sulfuric acid storage tank 5 according to the ratio, so that during the stirring and mixing process of the reaction tank 9, the dilute sulfuric acid storage tank 5 Simultaneously carry out the batching and concentration review and adjustment of the next batch of dilute sulfuric acid to ensure automatic continuous production and improve production efficiency.

The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent transformations made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in related technical fields, are all included in the same principle. Within the scope of patent protection of the present invention.

Claims (9)

1. The intelligent control method of the silica reaction process of the precipitation method, characterized in that, it is based on a control device; The control device includes: concentrated sulfuric acid storage tank, diluted water tank, concentrated sodium silicate storage tank, steam tank, dilute sulfuric acid storage tank, dilute sodium silicate storage tank, hot water storage tank, concentrated alkali storage tank, reaction tank and unloading tank; The discharge end of the concentrated sulfuric acid storage tank is connected to the feed end of the dilute sulfuric acid storage tank through a first connecting pipe; The discharge end of the concentrated sulfuric acid storage tank is connected with the feed end of the reaction tank through an eleventh connecting pipe; The discharge end of the dilution water tank is connected with the feed end of the dilute sulfuric acid storage tank through a second connecting pipe; The discharge end of the concentrated sodium silicate storage tank is connected with the feed end of the dilute sodium silicate storage tank through a third connecting pipe; The discharge end of the dilution water tank is connected with the feed end of the diluted sodium silicate storage tank through the fourth connecting pipe; The discharge end of the dilute sulfuric acid storage tank is connected to the feed end of the reaction tank through a fifth connecting pipe; The discharge end of the dilute sodium silicate tank is connected with the feed end of the reaction tank through the sixth connecting pipe; The discharge end of the steam tank is connected with the feed end of the reaction tank through the seventh connecting pipe; The discharge end of the hot water storage tank is connected to the feed end of the reaction tank through an eighth connecting pipe; The discharge end of the concentrated alkali storage tank is connected with the feed end of the reaction tank through the ninth connecting pipe; The discharge end of the reaction tank is connected to the feed end of the discharge tank through the tenth connecting pipe; The first connecting pipe is connected with a first liquid pump, a first electric control valve and a first flow meter; The second connecting pipe is connected with a second liquid pump, a second electric control valve and a second flowmeter; The third connecting pipe is connected with a third liquid pump, a third electric control valve and a third flow meter; The fourth connecting pipe is connected with a fourth liquid pump, a fourth electric control valve and a fourth flowmeter; The fifth connecting pipe is connected with a fifth liquid pump, a fifth electric control valve and a fifth flowmeter; The sixth connecting pipe is connected with a sixth liquid pump, a sixth electric control valve and a sixth flowmeter; The seventh connecting pipe is connected with a seventh liquid pump, a seventh electric control valve and a seventh flow meter; The eighth connecting pipe is connected with an eighth liquid pump, an eighth electric control valve, and an eighth flowmeter; The ninth connecting pipe is connected with a ninth liquid pump, a ninth electric control valve and a ninth flowmeter; The tenth connecting pipe is connected with a tenth liquid pump, a tenth electric control valve and a tenth flowmeter; The eleventh connecting pipe is connected with the twelfth liquid pump, the twelfth electric control valve and the eleventh flow meter; The dilute sulfuric acid storage tank is provided with a first liquid level monitor; the dilute sulfuric acid storage tank is connected with a first stirring motor; The dilute sodium silicate storage tank is provided with a second liquid level monitor; the dilute sodium silicate storage tank is connected with a second stirring motor; The reaction tank is provided with a temperature detector, a pH detector, and a third liquid level monitor; Also includes a DSC, the DSC is respectively connected with the first liquid pump, the first electric control valve, the first flow meter, the second liquid pump, the second electric control valve, the second flow meter, the third liquid pump, the third electric control valve, the third flow meter, the fourth liquid pump, the fourth electric control valve, the fourth flow meter, the fifth liquid pump, the fifth electric control valve, the fifth flow meter, the sixth liquid pump, the sixth electric control valve, The sixth flow meter, the seventh liquid pump, the seventh electric control valve, the seventh flow meter, the eighth liquid pump, the eighth electric control valve, the eighth flow meter, the ninth liquid pump, the ninth electric control valve, the ninth Flow meter, tenth liquid pump, tenth electric control valve, tenth flow meter, twelfth liquid pump, twelfth electric control valve, eleventh flow meter, first liquid level monitor, second liquid level monitor Instrument, temperature detector, conductivity detector, pH detector, the third liquid level monitor, the first stirring motor, the second stirring motor and the third stirring motor are electrically connected; Described control method comprises the following steps: Step 1: DSC controls the opening of the first liquid pump, the first electric control valve, the first flow meter, the second liquid pump, the second electric control valve, and the second flow meter, and the concentrated sulfuric acid in the concentrated sulfuric acid storage tank is The sulfuric acid and the water in the dilution water tank are pumped into the dilute sulfuric acid storage tank to mix; until the first liquid level monitor detects that the liquid level in the dilute sulfuric acid storage tank reaches the preset threshold value H, control the first liquid pump, the first electrical The control valve, the second liquid pump and the second electric control valve are closed; At the same time, the DSC controls the opening of the third liquid pump, the third electric control valve, the third flow meter, the fourth liquid pump, the fourth electric control valve, and the fourth flow meter, and discharges the concentrated sodium silicate storage tank according to the preset ratio. The concentrated sodium silicate and the water in the dilution water tank are pumped into the dilute sodium silicate storage tank and mixed; until the second liquid level monitor detects that the liquid level in the dilute sodium silicate storage tank reaches the preset threshold value H, control The third liquid pump, the third electric control valve, the fourth liquid pump and the fourth electric control valve are closed; Step 2: According to the real-time flow values monitored by the first flowmeter, the second flowmeter, the third flowmeter, and the fourth flowmeter, the DSC calculates the cumulative feeding volume of concentrated sulfuric acid and water in the dilute sulfuric acid storage tank, respectively, and calculates the dilute silicon Calculate the cumulative feeding volume of concentrated sodium silicate and water in the sodium silicate storage tank, respectively calculate the error between each cumulative feeding volume and the preset value; judge whether the error is within the preset threshold range; if the above errors exceed the preset threshold range, Then selectively open the first liquid pump, the second liquid pump, the third liquid pump or the fourth liquid pump according to the error value, and correspondingly selectively open the first electric control valve, the second electric control valve, the third electric control valve or The fourth electric control valve, until the above error value reaches the preset threshold range, close the corresponding electric control valve and liquid pump; DSC controls the first stirring motor and the second stirring motor to continue stirring for the preset process time, and then stop stirring; Step 3: DSC controls the fifth liquid pump, the fifth electric control valve, the fifth flow meter, the sixth liquid pump, the sixth electric control valve, the sixth flow meter, the eighth liquid pump, the eighth electric control valve, the eighth The flow meter is turned on, and the dilute sulfuric acid, dilute sodium silicate, and hot water are pumped into the reaction tank according to the preset ratio and mixed; until the third liquid level monitor monitors that the liquid level in the reaction tank reaches the preset threshold H level, it is closed The fifth liquid pump, the fifth electric control valve, the sixth liquid pump, the sixth electric control valve, the eighth liquid pump, and the eighth electric control valve; Step 4: According to the real-time flow values monitored by the fifth flowmeter, the sixth flowmeter and the eighth flowmeter, the DSC calculates the cumulative feeding volume of dilute sulfuric acid, dilute sodium silicate and hot water in the reaction tank respectively, and calculates the cumulative feeding volume of each cumulative feeding volume respectively. The error between the volume and the preset value; judging whether the error is within the preset threshold range; if the above error exceeds the preset threshold range, selectively open the fifth electric control valve, the sixth electric control valve or the eighth electric control valve , correspondingly selectively turn on the fifth liquid pump, the sixth liquid pump and the eighth liquid pump, until the above error value reaches the preset threshold range, close the corresponding electric control valve and liquid pump; Step 5: The DSC controls the third stirring motor to continue stirring; during the stirring process, the DSC controls the opening of the seventh liquid pump, the seventh electric control valve and the seventh flow meter according to the temperature value in the reaction tank detected by the temperature detector, Steam is introduced into the tank until the temperature of the reaction tank reaches the preset value, and the seventh liquid pump and the seventh electric control valve are closed; during the stirring process, the DSC detects the pH value in the reaction tank according to the pH detector, and controls the ninth liquid. Open the pump, the ninth electric control valve and the ninth flowmeter or control the opening of the twelfth liquid pump, the twelfth electric control valve and the eleventh flowmeter, and feed concentrated alkali or concentrated sulfuric acid into the reaction tank until the reaction tank When the pH value reaches the preset value, turn off the ninth liquid pump and the ninth electric control valve; Step 6: DSC controls the third stirring motor to continue stirring for a preset time, then stops stirring, controls the opening of the seventh liquid pump, the seventh electric control valve and the seventh flow meter, and completely discharges the materials in the reaction tank to the discharge tank . 2. the intelligent control method of precipitation silica reaction process according to claim 1, is characterized in that, described control device also comprises filter press, is provided with turbidity detector in described dilute sodium silicate storage tank , the discharge end of the dilute sodium silicate storage tank is connected with the feed end of the filter press through a pipeline, and the discharge end of the filter press is connected with the feed end of the dilute sodium silicate storage tank through a pipeline, so The pipeline is provided with an eleventh electric control valve and an eleventh liquid pump, and the eleventh electric control valve and the eleventh liquid pump are respectively electrically connected to the DSC; In the control method, after step 2, between step 3, step 21 is also included: DSC judges whether the error is Within the preset threshold range; if not, then control the eleventh electric control valve and the eleventh liquid pump to open, so that the liquid in the dilute sodium silicate tank is filtered by the filter press and then returned to the dilute sodium silicate storage tank. In the tank, this cycle is performed until the error is within the preset threshold range, and the eleventh electric control valve and the eleventh liquid pump are controlled to be closed. 3. The intelligent control method of the precipitation method silica reaction process according to claim 1, characterized in that, in the control device, the dilute sulfuric acid storage tank is provided with a first concentration detector, and the first The concentration detector is electrically connected to the DSC; In the control method, in the step 2, it further includes: DSC judges whether the error is within the preset threshold range according to the error between the concentration value in the dilute sulfuric acid storage tank detected by the first concentration detector and the preset value, If not, selectively open the first liquid pump or the second liquid pump, and selectively open the first electric control valve or the second electric control valve accordingly, until the above error value reaches the preset threshold range, then close the corresponding electric valve. control valves and liquid pumps. 4. the intelligent control method of precipitation method silicon dioxide reaction process according to claim 1, is characterized in that, in described control device, in described dilute sodium silicate storage tank, be provided with the second concentration detector, described The second concentration detector is electrically connected to the DSC; In the control method, in the step 2, it also includes: DSC judges whether the error is within the preset threshold range according to the error between the concentration value in the dilute sodium silicate storage tank detected by the second concentration detector and the preset value If not, then selectively open the third liquid pump or the fourth liquid pump, and selectively open the third electric control valve or the fourth electric control valve accordingly, until the above error value reaches the preset threshold range, close the corresponding electronically controlled valves and liquid pumps. 5. the intelligent control method of precipitation method silica reaction process according to claim 1, is characterized in that, the threshold value in described dilute sulfuric acid storage tank comprises L, M, H from low to high, when dilute sulfuric acid storage tank When the liquid level in the storage tank is lower than the threshold L, the first stirring motor rotates at the first stirring speed; when the liquid level in the dilute sulfuric acid storage tank is between the threshold L and M, the first stirring motor rotates at the second stirring speed, When the liquid level in the dilute sulfuric acid storage tank is between the thresholds M and H, the first stirring motor rotates at the third stirring speed, and the rotational speed ratio of the first stirring speed, the second stirring speed and the third stirring speed is 3 :4:5. 6. the intelligent control method of precipitation method silicon dioxide reaction process according to claim 1, is characterized in that, the threshold value in described dilute sodium silicate storage tank comprises L, M, H from low to high, when dilute dilute When the liquid level in the sodium silicate storage tank is lower than the threshold value L, the second stirring motor rotates at the first stirring speed; when the liquid level in the dilute sodium silicate storage tank is between the threshold value L and M, the second stirring motor The motor rotates at the second stirring speed. When the liquid level in the dilute sodium silicate storage tank is between the threshold M and H, the second stirring motor rotates at the third stirring speed. The first stirring speed, the second stirring speed The rotational speed ratio of the speed to the third stirring speed is 3:4:5. 7. the intelligent control method of precipitation method silica reaction process according to claim 1, is characterized in that, the threshold value in the described reaction tank comprises L, M, H from low to high, when the liquid level in the reaction tank When it is lower than the threshold L, the third stirring motor rotates at the first stirring speed. When the liquid level in the reaction tank is between the threshold L and M, the third stirring motor rotates at the second stirring speed. When the liquid in the reaction tank When it is between the thresholds M and H, the third stirring motor rotates at a third stirring speed, and the rotational speed ratio of the first stirring speed, the second stirring speed and the third stirring speed is 3:4:5. 8. The intelligent control method of the precipitated silica reaction process according to claim 1, characterized in that, in the step 1, further comprising: DSC according to the first flowmeter, the second flowmeter, the third flowmeter and the difference between the real-time flow value of the fourth flowmeter and the preset flow value, and use the PID algorithm to adjust the opening of the first electric control valve, the second electric control valve, the third electric control valve and the fourth electric control valve in real time ; In the step 3, it also includes: the DSC adjusts the fifth electric control valve, The opening degrees of the sixth electric control valve and the eighth electric control valve; In the step 5, it also includes: according to the difference between the real-time flow value of the seventh flow meter and the ninth flow meter and the preset flow value, the DSC uses the PID algorithm to adjust the seventh electric control valve and the ninth electric control valve in real time of the opening. 9. The intelligent control method of the precipitated silica reaction process according to claim 8, characterized in that, in the control method, when the third liquid level monitor monitors the emptying of the material in the reaction tank, repeat Step 3, when the first liquid level monitor detects that the liquid level in the dilute sulfuric acid storage tank is lower than H, or when the second liquid level monitor monitors that the liquid level in the dilute sodium silicate storage tank is lower than H, then repeat step 1.