PH regulation and control method and system based on two-step stamping

Abstract

The invention provides a PH regulation and control method and system based on two-step stamping, and belongs to the technical field of sewage treatment. The PH regulation and control method based on two-step stamping comprises the following steps: S1, a coarse regulation stage: introducing methanol sewage into a coarse regulation tank; by setting a coarse adjustment stage and a fine adjustment stage of the methanol sewage, the pH of the methanol sewage is adjusted in two steps, sulfuric acid is replaced by hydrochloric acid, the cost can be greatly reduced, the methanol sewage is introduced into a coarse adjustment tank, the hydrochloric acid is sprayed into the coarse adjustment tank through a high-pressure ejector, and meanwhile, a turbine stirrer is mounted in the coarse adjustment tank, so that the sewage and the hydrochloric acid are stirred and mixed; the pH value of the wastewater is rapidly reduced from initial alkalinity to a preset value, namely alkalescence, so that alkalescence sewage is introduced into a fine adjustment tank, hydrochloric acid is introduced into the fine adjustment tank in a gradient decreasing manner through a peristaltic pump, and a low-speed spiral stirrer is mounted in the fine adjustment tank, so that the hydrochloric acid and the sewage are uniformly mixed, and the overshoot risk is reduced through a two-step regulation and control method; the PH fluctuation range is stable.

Description

Technical Field

[0001] This application relates to the field of sewage treatment. Specifically, it relates to a two-step stamping pH regulation method and system. Background Art

[0002] Energy, environment and water resources are the basis for human survival. In recent years, with the rapid growth in the use of fossil fuels, especially oil and natural gas, a global energy crisis has been triggered. In addition, a large amount of CO2 emitted during the use of fossil fuels will cause the greenhouse effect and lead to climate warming. How to convert the excess carbon dioxide that has not participated in the carbon cycle into fuels and chemical products, which can not only solve environmental problems but also achieve sustainable development, has become a problem that scientists around the world are striving to explore. Classified by the source of sewage, sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Production sewage includes industrial sewage, agricultural sewage, medical sewage, etc., while domestic sewage is the sewage generated in daily life, which refers to a complex mixture of various forms of inorganic and organic substances. People will generate a large amount of sewage in daily life, and at the same time, methanol wastewater will also be generated in chemical production, the pharmaceutical industry, fuel and energy production, electronics and manufacturing, laboratories and medical treatment. In methanol production and chemical wastewater treatment, the pH regulation of ammonia-containing methanol liquid is a key process link. Traditional methods mostly use single-stage acid-base neutralization, which is prone to local over-acidity / over-alkalinity due to uneven mixing or dynamic fluctuations, affecting the efficiency of subsequent deammoniation, precipitation or biochemical treatment. At the same time, the traditional treatment method is to introduce sulfuric acid into the sewage, and the cost of using sulfuric acid is relatively high. For this reason, we propose a two-step stamping pH regulation method and system. Summary of the Invention

[0003] To make up for the above deficiencies, this application provides a two-step stamping pH regulation method and system, aiming to improve the poor effect of methanol sewage treatment.

[0004] In a first aspect, an embodiment of this application provides a two-step stamping pH regulation method, including

[0005] S1. Coarse adjustment stage: The methanol sewage is introduced into the coarse adjustment tank, and hydrochloric acid is injected into the coarse adjustment tank at a high flow rate, so that the pH of the wastewater quickly drops from the initial alkalinity to a preset value, and then the high-flow injection of hydrochloric acid is stopped;

[0006] S2. Fine adjustment stage: The wastewater that has reached the preset value is introduced into the fine adjustment tank. Based on the on-line pH detector, the real-time pH value of the sewage is detected in real time. The low-flow precision metering pump is started, and hydrochloric acid is added in a gradually decreasing gradient manner to gradually stabilize the pH to the target value.

[0007] In a specific implementation, before the coarse adjustment stage of the methanol sewage, the methanol sewage is introduced into the sewage sedimentation tank for impurity removal treatment, and the sewage after impurity removal is put into the coarse adjustment tank.

[0008] In a specific implementation, in the above step S1, a stamping-type rapid neutralization method is used. A high-pressure injector and a turbine agitator are arranged in the rough adjustment tank. The high-pressure injector sprays hydrochloric acid into the rough adjustment tank. At the same time, the turbine agitator in the rough adjustment tank stirs the sewage, so that the hydrochloric acid is quickly dispersed in the rough adjustment tank, and the real-time pH value of the sewage is detected based on an on-line pH detector.

[0009] In a specific implementation, in the above step S2, a peristaltic pump is arranged to add hydrochloric acid to the fine adjustment tank in a gradually decreasing gradient. At the same time, a low-speed spiral agitator is installed in the fine adjustment tank, and the low-speed spiral agitator rotates in the fine adjustment tank to uniformly mix the sewage and hydrochloric acid.

[0010] In a specific implementation, in the above step S2, in the subsequent treatment process, the adjusted wastewater enters the deammoniation tower for the process of removing ammonia nitrogen from the wastewater.

[0011] In a second aspect, the present application further provides a two-step stamping pH regulation system, including

[0012] the above-mentioned two-step stamping pH regulation method; and

[0013] a central controller, in which an intelligent control module is arranged. The intelligent control module includes a central control unit, a high-pressure injector control module, a turbine agitator control module, and a peristaltic pump control module. The high-pressure injector control module, the turbine agitator control module, and the peristaltic pump control module are connected to the central control unit. The high-pressure injector control module is connected to the high-pressure injector to control the hydrochloric acid injection flow rate in real time. The turbine agitator control module is connected to the turbine agitator to calculate the optimal rotation speed in real time based on a fluid dynamics model, and a variable frequency drive is used to prevent short-circuit flow. The peristaltic pump control module is connected to the peristaltic pump.

[0014] In a specific implementation, the intelligent control module further includes a data processing module. The data processing module is connected to the central control unit and feeds back the collected real-time data to the central control unit. The central control unit controls the high-pressure injector, the turbine agitator, and the peristaltic pump according to the real-time data.

[0015] In a specific implementation, a pressure sensor and a flow meter are installed on the high-pressure injector pipeline to monitor the hydrochloric acid injection pressure and injection flow rate in real time. The pressure sensor and the flow meter are connected to the data processing module to feed back the monitored data to the data processing module. The data processing module generates real-time data and feeds the data back to the central control unit. The central control unit controls the hydrochloric acid injection flow rate and dynamically adjusts the injection pressure.

[0016] In a specific embodiment, an acceleration sensor is installed on the turbine stirrer. The acceleration sensor is connected to a data processing module to monitor the rotation speed of the turbine stirrer in real time. The data processing module generates data in real time and feeds it back to the central processing unit to control and dynamically adjust the turbine stirrer in real time.

[0017] In a specific embodiment, the on-line pH detectors in the rough adjustment tank and the fine adjustment tank are connected to a data processing module to monitor the pH value in the rough adjustment tank and the fine adjustment tank in real time. The pH value is fed back to the data processing module, and then the data processing module generates data and feeds it back to the central control unit to accurately control the pH value of the sewage.

[0018] Advantages of the present application: By setting the rough adjustment stage and the fine adjustment stage of methanol sewage, the pH of methanol sewage is adjusted in two steps. Using hydrochloric acid instead of sulfuric acid can greatly reduce the cost. Methanol sewage is introduced into the rough adjustment tank, and hydrochloric acid is sprayed into the rough adjustment tank through a high-pressure injector. At the same time, a turbine stirrer is installed in the rough adjustment tank to mix the sewage and hydrochloric acid by stirring, so that the pH of the wastewater quickly drops from the initial alkaline to the preset value, that is, weakly alkaline. Then the weakly alkaline sewage is introduced into the fine adjustment tank, and hydrochloric acid is introduced into the fine adjustment tank in a gradient decreasing manner through a peristaltic pump, and a low-speed spiral stirrer is installed in the fine adjustment tank to mix the hydrochloric acid and the sewage evenly. Through the two-step regulation method, the risk of overshoot is reduced, and the pH fluctuation range is stable. By setting on-line pH detectors in the rough adjustment tank and the fine adjustment tank to monitor the pH value of the sewage in the rough adjustment tank and the fine adjustment tank in real time, and by setting an intelligent control module, the obtained pH value data is fed back to the data processing module. The data processing module generates real-time pH numerical data and feeds it back to the central control unit. Then the central control unit controls the hydrochloric acid injection amount in real time through the high-pressure injector control module and the peristaltic pump control module to prevent overshoot and improve the stability of sewage pH regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a step block diagram of the two-step stamping pH regulation method provided by the embodiment of the present application;

[0021] Figure 2 It is a flow block diagram of the two-step stamping pH regulation system provided by the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0023] Embodiment 1

[0024] Please refer to Figure 1 , the present application provides a two-step stamping pH regulation method, including

[0025] S1. Coarse adjustment stage: Methanol sewage is introduced into the coarse adjustment tank, and hydrochloric acid is injected into the coarse adjustment tank at a high flow rate, so that the pH of the wastewater quickly drops from the initial alkaline to a preset value, that is, quickly drops to weakly alkaline, and then the high-flow injection of hydrochloric acid is stopped.

[0026] S2. Fine adjustment stage: The wastewater that reaches the preset value is introduced into the fine adjustment tank. Based on the on-line pH detector, the real-time pH value of the sewage is detected in real time. The low-flow precision metering pump is started, and hydrochloric acid is added in a gradient decreasing manner to gradually stabilize the pH to the target value.

[0027] In addition, before the pH regulation of methanol sewage, there is also a sewage pretreatment stage. Before the coarse adjustment stage of methanol sewage, the methanol sewage needs to be introduced into the sewage sedimentation tank. The sewage flows through the sedimentation tank, and the impurities in the sewage can be settled to remove impurities from the sewage. The sewage after impurity removal is introduced into the coarse adjustment tank for pH regulation.

[0028] In the above step S1, the stamping type rapid neutralization method is used. A high-pressure injector and a turbine stirrer are arranged in the coarse adjustment tank. The hydrochloric acid ejected by the high-pressure injector can cover the coarse adjustment tank, so that the hydrochloric acid is evenly sprayed on the surface of the sewage. The high-pressure injector sprays hydrochloric acid into the coarse adjustment tank. At the same time, the turbine stirrer in the coarse adjustment tank stirs the sewage, and the hydrochloric acid is mixed with the sewage, so that the hydrochloric acid is quickly dispersed in the coarse adjustment tank. Based on the on-line pH detector, the real-time pH value of the sewage is detected in real time.

[0029] In the above step S2, a peristaltic pump is set. The outlet of the peristaltic pump is located in the fine adjustment tank to add hydrochloric acid to the fine adjustment tank in a gradient decreasing manner. The outlet of the peristaltic pump can be connected to a spraying device so that the discharged hydrochloric acid can cover the surface of the sewage in the fine adjustment tank, and the uniform mixing between the sewage and the hydrochloric acid is utilized. At the same time, a low-speed spiral stirring paddle is installed in the fine adjustment tank, and the low-speed spiral stirring paddle rotates in the fine adjustment tank to further promote the uniform mixing of the sewage and the hydrochloric acid.

[0030] In the above step S2, in the subsequent treatment process, the adjusted wastewater enters the deammoniation tower for the process of removing ammonia nitrogen from the wastewater.

[0031] Embodiment 2

[0032] Please refer to Figure 2 , the present application further provides a two-step stamping pH regulation system, including the above two-step stamping pH regulation method; and

[0033] Central controller, an intelligent control module is set inside the central controller. The intelligent control module includes a central control unit, a high-pressure injector control module, a turbine agitator control module, and a peristaltic pump control module. The high-pressure injector control module, the turbine agitator control module, and the peristaltic pump control module are connected to the central control unit. The high-pressure injector control module is connected to the high-pressure injector, and the high-pressure injector control module controls the operation of the high-pressure injector to achieve real-time control of the hydrochloric acid injection flow rate. The turbine agitator control module is connected to the turbine agitator, and the turbine agitator control module controls the turbine agitator to calculate the optimal rotation speed in real time based on the fluid mechanics model and prevent short circuit by using variable frequency drive. The peristaltic pump control module is connected to the peristaltic pump to control the flow rate of hydrochloric acid entering the fine-tuning tank, thereby realizing dynamic regulation during the sewage treatment process and preventing overshoot.

[0034] The intelligent control module further includes a data processing module. The data processing module is connected to the central control unit and feeds back the collected real-time data to the central control unit. The collected data includes the real-time pH value of the sewage in the rough adjustment tank and the fine-tuning tank, as well as the real-time injection pressure and injection flow rate of hydrochloric acid in the high-pressure injector. Then, the central control unit controls the high-pressure injector, the turbine agitator, and the peristaltic pump according to the real-time data to realize dynamic regulation of the hydrochloric acid spraying pressure and injection flow rate. There is also a hydrochloric acid storage tank body. The high-pressure injector and the peristaltic pump are connected to the hydrochloric acid storage tank body to draw out the hydrochloric acid in the hydrochloric acid storage tank body and introduce the hydrochloric acid into the rough adjustment tank and the fine-tuning tank.

[0035] A pressure sensor and a flow meter are installed on the high-pressure injector pipeline to monitor the hydrochloric acid injection pressure and injection flow rate in real time. The pressure sensor and the flow meter are connected to the data processing module to feed back the monitored data to the data processing module. The data processing module generates real-time data and feeds the data back to the central control unit. The central control unit controls the hydrochloric acid injection flow rate and dynamically adjusts the injection pressure.

[0036] An acceleration sensor is installed on the turbine agitator. The acceleration sensor is connected to the data processing module to monitor the rotation speed of the turbine agitator in real time. The rotation speed data of the turbine sensor obtained by the acceleration sensor is transmitted to the data processing module. The data processing module generates real-time data and feeds it back to the central processing unit. Then, according to the data, the turbine agitator is dynamically adjusted in real time.

[0037] The on-line pH detectors in the rough adjustment tank and the fine-tuning tank are connected to the data processing module. The pH sensors of the on-line pH detectors are placed in the sewage to monitor the pH value in the rough adjustment tank and the fine-tuning tank in real time, feed back the detected pH value to the data processing module, and then the data processing module generates data and feeds it back to the central control unit to accurately regulate the sewage pH value according to the real-time pH value of the sewage in the rough adjustment tank and the fine-tuning tank.

[0038] Working principle of the two-step stamping pH regulation method and system: Methanol sewage is introduced into the rough adjustment tank. At the same time, the high-pressure injector and the turbine stirrer are started. The high-pressure injector sprays hydrochloric acid into the rough adjustment tank, and the turbine stirrer rotates to mix the hydrochloric acid with the sewage. An on-line pH detector is connected inside the rough adjustment tank to monitor the pH value of the sewage inside the rough adjustment tank in real time. The monitoring data is fed back to the data processing module. The data processing module generates data and feeds it back to the central control unit. A pressure sensor and a flow meter are connected to the pipeline of the high-pressure injector, and an acceleration sensor is installed on the turbine stirrer. The monitoring data is transmitted to the data processing module, thereby generating data and feeding it back to the central control unit. The central control unit realizes dynamic regulation of the hydrochloric acid injection pressure and flow rate according to the real-time data, and simultaneously dynamically controls the rotation speed of the turbine sensor. Then, the pH value of the sewage in the rough adjustment tank quickly drops to the preset value. After that, the sewage in the rough adjustment tank is introduced into the fine adjustment tank, and hydrochloric acid is transported to the fine adjustment tank in a decreasing gradient through a peristaltic pump. A low-speed spiral stirrer is installed in the fine adjustment tank to mix the sewage with hydrochloric acid. At the same time, an on-line pH detector in the fine adjustment tank monitors the pH value of the sewage inside the fine adjustment tank in real time. Then, through two-step pH regulation, the pH regulation of methanol sewage is completed.

[0039] The above are only embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

Claims

1. A two-step stamping pH control method, characterized in that: include S1, in the rough adjustment stage, methanol wastewater is passed into the rough adjustment tank, and hydrochloric acid is injected into the rough adjustment tank at a high flow rate to quickly reduce the pH of the wastewater from the initial alkalinity to the preset value, and the high-flow injection of hydrochloric acid is stopped; S2, during the fine-tuning stage, the wastewater reaching the preset value is passed into the fine-tuning tank, and the real-time pH value of the wastewater is detected in real time based on the online pH detector. The low-flow precision metering pump is started, and hydrochloric acid is added in a gradient decreasing manner to gradually stabilize the pH to the target value.

2. A two-step stamping pH control method according to claim 1, characterized in that: Before the rough adjustment stage of methanol wastewater, the methanol wastewater is passed into a wastewater sedimentation tank to remove impurities from the wastewater, and the wastewater after impurities removal is put into the rough adjustment tank.

3. The two-step stamping pH control method according to claim 1, characterized in that: In the above step S1, a stamping-type rapid neutralization method is used, and a high-pressure injector and a turbine agitator are arranged in the rough adjustment tank. The high-pressure injector sprays hydrochloric acid into the rough adjustment tank, and at the same time, the turbine agitator in the rough adjustment tank stirs the sewage to make the hydrochloric acid disperse rapidly in the rough adjustment tank, and the real-time pH value of the sewage is detected in real time based on the online pH detector.

4. The two-step stamping pH control method according to claim 1, characterized in that: In the above step S2, a peristaltic pump is provided to add hydrochloric acid into the fine-tuning tank in a decreasing gradient, and a low-speed screw stirring propeller is installed in the fine-tuning tank, and the low-speed screw stirring propeller rotates in the fine-tuning tank to evenly mix the sewage and the hydrochloric acid.

5. The two-step stamping pH control method according to claim 1, characterized in that: In the above step S2, in the subsequent treatment process, the regulated wastewater enters the deammonification tower to carry out the process of removing ammonia nitrogen from the wastewater.

6. A two-step stamping pH control system, characterized in that: include The two-step stamping pH control method according to any one of claims 1 to 5; as well as A central controller is provided with an intelligent control module, and the intelligent control module includes a central control unit, a high-pressure injector control module, a turbine agitator control module and a peristaltic pump control module. The high-pressure injector control module, the turbine agitator control module and the peristaltic pump control module are connected to the central control unit. The high-pressure injector control module is connected to the high-pressure injector to control the hydrochloric acid injection flow in real time. The turbine agitator control module is connected to the turbine agitator, and calculates the optimal speed in real time based on a fluid mechanics model, and adopts a variable frequency drive to prevent short flow. The peristaltic pump control module is connected to the peristaltic pump.

7. A two-step stamping pH control system according to claim 6, characterized in that: The intelligent control module also includes a data processing module, which is connected to the central control unit and feeds back the collected real-time data to the central control unit. The central control unit controls the high-pressure ejector, turbine agitator and peristaltic pump according to the real-time data.

8. A two-step stamping pH control system according to claim 7, characterized in that: A pressure sensor and a flow meter are installed on the high-pressure injector pipeline to monitor the hydrochloric acid injection pressure and injection flow in real time. The pressure sensor and the flow meter are connected to the data processing module to feed back the monitoring data to the data processing module. The data processing module generates real-time data and feeds the data back to the central control unit. The central control unit controls the hydrochloric acid injection flow and dynamically adjusts the injection pressure.

9. A two-step stamping pH control system according to claim 7, characterized in that: The turbine agitator is equipped with an acceleration sensor, which is connected to a data processing module to monitor the rotation speed of the turbine agitator in real time. The data processing module generates data in real time and feeds it back to a central processing unit to control and dynamically adjust the turbine agitator in real time.

10. A two-step stamping pH control system according to claim 6, characterized in that: The online pH detectors in the rough adjustment tank and the fine adjustment tank are connected to the data processing module to monitor the pH value in the rough adjustment tank and the fine adjustment tank in real time, and feed the pH value back to the data processing module, which then generates data and feeds it back to the central control unit to accurately control the pH value of the sewage.

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