automatic acid and alkali dosing system for water treatment

Automatic acid and alkali dosing system is a kind of efficient and precise water quality adjustment equipment, which can automatically adjust the dosage of chemicals according to the real-time water quality data, and is widely used in the fields of thermal power generation, petrochemical industry and wastewater treatment.

The following is a detailed introduction of the automatic acid and alkali dosing device:

1. Process principle
   The pH value of water is an important indicator of water quality, and many industrial processes need to ensure that the pH value of water is maintained within a certain range. For example, in cooling water treatment, wastewater neutralization and other processes, too low or too high pH value will cause corrosion of equipment or affect the chemical reaction. Therefore, acid or alkali is usually used to adjust the pH value of water.
   Acid: Commonly used acidic agents include sulfuric acid, hydrochloric acid, etc., mainly used to reduce the pH value of water.
   Alkaline agents: Commonly used alkaline agents include ammonia, calcium hydroxide and sodium carbonate, which are mainly used to raise the pH of water. These agents are added to the water through the solution, and the dosage is automatically adjusted according to the change of real-time pH value.
2. Process Overview
   The basic process of automatic acid and alkali dosing device involves several main links such as liquid dissolution, dosing and system control:
   – Pharmaceutical solution dissolution system: solid pharmaceuticals are first added to the pharmaceutical solution dissolution tank, the dissolution tank will be mixed with industrial water, through the stirring of the pharmaceutical dissolved into solution. The concentration of the dissolved drug solution is adjusted according to the need.
   – Metering and dosing system: through the metering pump or proportional pump, the dissolved drug solution will be dosed into the water treatment system according to a predetermined ratio of the drug point. The size of the dosage is automatically adjusted by the system according to the real-time pH value.
   – Dosage control mode: dosage control can be adjusted manually, but also through the automatic way to realize the follow-on control. Automatic control is usually based on the upper system (such as PLC or DCS) output control signals, automatically adjust the dosage of chemicals.
   – Safety system: Including pressure and flow monitoring, solvent tank level monitoring, etc., to ensure the safe operation of the equipment during the dosing process.
   – Control system: through linkage with pH sensor, the control system can monitor the pH value of water in real time and adjust the dosage automatically according to the set value.
3. System Composition
   Automatic acid and alkali dosing device usually includes the following main components:
   – Dissolution system: solid chemicals are mixed with water through the dissolution tank to form a solution. The system usually includes agitators and solvent tank.
   – Metering pump: precise control of the dosage of the drug solution to ensure that the agent is dosed as needed.
   – pH sensor: real-time monitoring of the pH value of the water body, and the signal feedback to the control system.
   – Automatic control system: according to the feedback of real-time pH value, automatically adjust the dosage. The control system can adopt PLC, DCS and other control platforms.
   – Safety protection devices: such as dissolving tank level meter, flow switch, pressure sensor, etc., to ensure the safety and stability of the system in the working process.
4. automatic acid and alkali dosing system Applicable scope
   Automatic acid and alkali dosing device is widely used in many fields that need to precisely adjust the pH value of water, especially in the following areas:
   – Thermal power plants: the cooling water system of thermal power plants often need to add acid or alkali to maintain the pH value of the water, prevent corrosion and improve system efficiency.
   – Petrochemical cooling circulating water treatment: In the water treatment process of petrochemical industry, pH control of cooling water is very critical to ensure the smooth running of the reaction process.
   – Raw water pretreatment: in the feed water treatment process, usually need to adjust the pH value to ensure the effectiveness of subsequent processes.
   – Neutralization of wastewater: When treating wastewater, it is necessary to adjust the pH value according to the nature of the wastewater, usually through the addition of acid or alkali to achieve neutralization.
5. automatic acid and alkali dosing system Advantages
   – Precise control: The automated control system can automatically adjust the dosage of chemicals according to the real-time monitoring of pH value to ensure that the water quality is within the set range.
   – Reduced manual intervention: through automatic dosing and control, it reduces the workload of manual adjustment and improves the reliability and efficiency of operation.
   – High safety: the safety monitoring device of the system can effectively prevent over dosage of chemicals or equipment failure, and guarantee the stable operation of the system.
   – Strong adaptability: it is suitable for various industrial water treatment scenarios, such as cooling water, wastewater neutralization and raw water treatment.