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System and method for regulating and controlling pH value of dephenolization device

A technology of dephenolization and pH value, which is applied in the direction of control/adjustment system, chemical instrument and method, control of various fluid ratios, etc. It can solve the problems of pH value fluctuation, large pH value fluctuation, and difficult control, etc., and reduce labor strength, prolonging operating life, and avoiding the effect of large fluctuations

Inactive Publication Date: 2022-03-01
宝钢化工湛江有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the traditional method of repeatedly manually adjusting the addition and subtraction of the feed liquid to realize the pH value adjustment is difficult to control and easily causes large fluctuations in the pH value, the present invention proposes a system and method for pH value adjustment of the dephenolization device to avoid Real-time and stable control of the pH value due to large fluctuations in pH value caused by changes in the concentration of different acid-base liquids

Method used

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  • System and method for regulating and controlling pH value of dephenolization device
  • System and method for regulating and controlling pH value of dephenolization device
  • System and method for regulating and controlling pH value of dephenolization device

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Embodiment 1

[0044] A pH online measuring meter is installed in the feed inlet pipeline of the separation tower of the dephenolization device. According to the real-time pH measurement value of the feed in the pipeline measured by the pH online measuring meter, the staff manually increases or decreases the net phenolic sodium salt flow rate. Adjust the pH value of the feed in the pipeline so that the pH of the feed liquid entering the separation tower meets the requirements, but the way of adjusting the pH value by repeatedly manually adjusting the addition and subtraction of the feed liquid is difficult to control and easily causes large fluctuations in the pH value , and will increase the labor intensity of the staff. In order to solve the above problems, a system for regulating the pH value of the dephenolization device is proposed in this embodiment, see figure 1 , before the feed liquid enters the separation tower of the dephenolization device, the pH value of the feed liquid is regul...

Embodiment 2

[0055] In this embodiment, the acid pipeline 1 is also provided with an acid solution flow meter 13, the acid solution flow meter 13 is used to measure the flow of the acid solution in the acid pipeline 1, and the flow measurement value is transmitted to the acid solution flow controller 10, see figure 1 , acid solution flow, 13, acid solution flow controller 12 and acid regulating valve 3 form an acid flow PID control loop 111, in order to achieve real-time feedback, the purpose of stable pH control.

[0056] Preferably, the alkaline pipeline 2 is also provided with an alkaline solution flowmeter 14, which is used to measure the flow of the alkaline solution in the alkaline pipeline 2, and transmits the flow measurement value to the alkaline solution flow controller, and the alkaline solution flowmeter 14. The alkaline solution flow controller 12 and the alkaline regulating valve 4 form an alkaline flow PID control loop 112 to achieve real-time feedback and stable pH control. ...

Embodiment 3

[0058] see image 3 , based on the system of embodiment 1 and embodiment 2, a method for regulating the pH value of the dephenolization device is proposed in the present embodiment, and the method includes the following steps:

[0059] S1. Set the pH target value of the mixed material liquid entering the separation tower of the dephenolization device through the pH value target setting module;

[0060] S2. Start the pipeline feeding work of the dephenolization device, transport the acidic solution in the acidic pipeline, transport the alkaline solution in the alkaline pipeline, and mix the acidic solution and the alkaline solution at the inlet pipeline of the separation tower;

[0061] S3. Use the online pH meter to measure the real-time pH value of the mixed material liquid in the inlet pipeline online, and transmit the real-time pH value to the pH controller AIC;

[0062] S4. The pH value controller AIC compares and analyzes the real-time pH value and the pH target value, g...

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Abstract

The invention discloses a system and method for regulating and controlling the pH value of a dephenolization device, and relates to the technical field of pH value regulation and control. Firstly, the real-time pH value of mixed feed liquid in a pipeline is measured, and a pH regulation and control target value is generated by taking a pH value controller AIC as a controller playing a real-time management and control role on the whole; the pH regulation and control target value and the flow of the acid solution are jointly used as input of a ratio controller, flow regulation and control of the alkaline solution are guided on the basis of the ratio of acid and alkali variables, and therefore the pH value is controlled in real time. The defect of non-linear change of the flow of an acid-base solution caused by a traditional mode of manually regulating feed liquid addition and decrement only by taking a measured value of a pH value online measuring meter as a reference is overcome, the phenomenon of large fluctuation of the pH value is avoided, the pH value is stably controlled in real time through cooperation of real-time feedback, the pH value is further controlled to be weak acid-base property, equipment corrosion is delayed, and the service life of equipment is prolonged. The service life of the dephenolization device is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of pH value regulation, and more specifically, relates to a system and method for pH value regulation of a dephenolization device. Background technique [0002] pH, also known as hydrogen ion concentration index and acid-base value, is a scale of hydrogen ion activity in a solution, which is also a measure of the acidity and alkalinity of a solution in the usual sense. pH value is an important controlled parameter in the process of industrial production, and it widely exists in many fields such as petrochemical industry, biopharmaceutical and wastewater treatment. The quality of pH value control will often directly affect the quality of products, the compliance of emission indicators and the economic benefits of enterprises. [0003] At present, an online pH meter is installed in the feed pipeline of the separation tower of the dephenolization device. According to the real-time pH measurement value of the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D21/02B01F35/213B01F35/221B01F35/82
CPCG05D21/02
Inventor 余建帅华权章陈水旺袁海雷赵龙陈俊杰柳叶青郑日云
Owner 宝钢化工湛江有限公司
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