The problem of corrosion and microbial susceptibility poses a major hazard to industrial production in the water use of modern plants. Therefore, the circulating cooling water must be treated with water treatment chemicals. This will stabilize the water quality. And ensure the high efficiency of production and the safety of chemical equipment.
The scale inhibitor mainly solves the problem of the water circulation system from the following three aspects.
First, scale inhibition.
Various salts are dissolved in natural water. Such as bicarbonate, carbonate, sulfate, silicate and so on. When natural water enters the circulating water system as supplemental water. The water is concentrated by evaporation and the concentration of ions in the water increases. Especially the bicarbonate in water. This salt is the main component of scale adhesion in cooling water.
The addition of a high-efficiency scale inhibitor can inhibit and destroy the normal growth of inorganic salt crystals such as calcium carbonate. Slows down the growth rate of the crystal. Thereby reducing the formation of salt scale. The scale inhibitor forms a water-soluble complex with Ca2+, Mg2+, and the like. Thereby the solubility of the inorganic salt is increased. In this way, it acts as a scale inhibitor.
Second, corrosion inhibition.
The second problem is the corrosion of metal equipment. The surface of the metal (carbon steel, stainless steel, copper, etc.) is in contact with water. The water contains various impurities such as dissolved oxygen and CO2. An electrochemical reaction occurs due to the potential difference. Thereby causing corrosion damage to the metal.
Corrosion leads to a shortened life of the equipment. Corrosion products form fouling which reduces heat exchange efficiency. Eventually, the heat exchanger was leaked and the production was unexpectedly stopped.
There are many ways to control the corrosion of a circulating water system. The pharmaceutical method is one of them. By adding and maintaining a certain amount of corrosion inhibitor to the circulating water. A dense metal oxide film or other types of film on the surface of the metal. In order to achieve corrosion, the corrosion process is carried out.
Corrosion and scale inhibitors can greatly reduce the corrosion rate of the equipment. Equipment life is greatly extended. Experiments show that after the heat exchanger pipeline equipment is prevented by the corrosion inhibitor, the service life of the equipment is extended by about 40% on average.
Third, sterilization and algae killing
The open circulating water system has sufficient light and a suitable temperature. And the abundant nutrient source in the water is conducive to the growth of microorganisms. This leads to biological slime and corrosion. The harm that microorganisms bring to the system is nothing more than dirt and corrosion. These hazards are often mixed with the dangers of scale and electrochemical corrosion.
Microbial slime is composed of microbial cells and viscous substances (polysaccharides, proteins, etc.) that are bonded together. In open-circuit circulating cooling water systems, especially slime bacteria cause more failures. The second is the problems and treatments of algae, mold (filamentous bacteria), and jersey bacteria (filamentous fine water system).
For circulating cooling water systems. In order to cooperate with the system to prevent scale and improve corrosion inhibition. Water treatment companies need to regularly add bactericidal algaecide for treatment. For this circulation system, oxidizing and non-oxidizing bactericides are used alternately. This will prevent bacteria from developing resistance. Improve the sterilization effect.
The main products are benzalkonium chloride, CMIT/MIT, DBNPA, and THPS.
In summary, the scale inhibitor mainly solves the problem of the water circulation system from the following scale inhibition, corrosion inhibition, and sterilization and algae elimination.
The scale inhibitor has high specific gravity and low specific gravity. Which is better?
Many IRO customers are involved in the specific gravity of the scale inhibitor when using scale inhibitors. So is the specific gravity of the scale inhibitor high or low?
Generally speaking, the scale inhibitor under the same formula is, of course, the higher the specific gravity, the better. But it should also distinguish the scope of application. For example, some scale inhibitors are specifically designed to prevent carbonate scaling. Some are used to prevent sulfate scaling. Some are used to prevent phosphate fouling. Some are used to prevent silica fouling.
Everyone knows that scaling measures for carbonates are easy to control. The precipitation of calcium carbonate can be effectively controlled even without adding acid. The principle is very simple, adding hydrochloric acid or sulfuric acid to adjust the pH of the raw water. This allows the bicarbonate ions to be not hydrolyzed to carbonate in certain acidic influent water.
Therefore, it is often possible to effectively prevent the precipitation of calcium carbonate without adding a scale inhibitor. However, the addition of the scale inhibitor can be achieved with a certain degree of effort, and the amount of acid can be reduced.
Because of the scaling process of sulfate, phosphate, and silica is complicated. Control is also not easy. In particular, the scale of silicates can also be complexed with metal ions such as iron ions, manganese ions, and aluminum ions. This makes the cleaning process even more difficult. However, the formulation and production process of such scale inhibitors is also complicated, so it is not possible to judge the quality of the products from the specific gravity.
Taking into account comprehensively, the quality of the scale inhibitor is not only judged from the proportion of the proportion. Also, consider other factors. In general, it is possible to measure the scale inhibition rate of the product through a small sample test, which is a very good criterion.