What harm will the oil in the water cause to the chemical water treatment desalination equipment?

The biggest difference is that one is a physical process and the other is a chemical reaction.

The use of ion exchange resin to soften water is to use the resin to adsorb calcium and magnesium ions in water, which is equivalent to filtering out calcium and magnesium ions from water, so that the filtered water can achieve the purpose of softening, and no new substances are produced in the process.

The chemical desalination process is to make the calcium and magnesium ions in the water undergo a chemical reaction to generate new substances that are insoluble in water and reduce the content of calcium and magnesium ions in the water to achieve the purpose of softening.

Salts are prone to fouling, resulting in reduced thermal conductivity and uneven heating, which may lead to aggravated local wear and tear of equipment.

The decomposition of some unstable salts when exposed to heat may lead to more serious consequences.

Too much organic matter enters the boiler, which is more likely to produce excess gases or other toxic and harmful substances due to complex chemical reactions.

Corrosion, scaling, salt accumulation, can lead to burst pipe leakage, etc.

Chemicals are harmful to aquatic life, and the composition of chemicals can harm aquatic life.

Chemicals are very harmful to aquatic life. It could lead to the extinction of aquatic life.

Generally, the condenser cooling water only needs to be treated by the water purifier, and of course, a certain amount of concentrated sulfuric acid and scale inhibitors need to be added. I think demineralization is fine, but you also need to add these medicines...

Chemical demineralized water is also soft water, which can be used to replenish water in superheated water wells during the start-up process, and can also be sprayed with demineralized water to cool down when the exhaust temperature is high, so it can be directly added to the condenser. During the normal operation of the steam turbine, the direct addition of demineralized water to the condenser will reduce the temperature of the condensate, resulting in a larger temperature difference between the exhaust steam temperature and the condensate temperature (greater supercooling), so the economy will be reduced.

The water treatment process of the power station is divided into two parts, the first part is the physical softened water process, and the second part is the chemical desalination process.

Physical softened water process: The raw water (also known as raw water) from the water supply network of the plant area is passed through the quartz sand filter and activated carbon filter to remove the solid particles and suspended impurities in the raw water, which is called clarified water; The clarified water then passes through the reverse osmosis device to remove most of the calcium and magnesium ions and become softened water.

Chemical demineralization process: the softened water passes through the decarburizer to remove carbon dioxide in the water (strictly speaking, HCO3—), and then through the mixed bed, the residual calcium, magnesium, sodium, silicate and other harmful ions in the water are removed to become demineralized water, that is, boiler feed water, stored in the desalination water tank, and then pumped into the deaerator with the demineralized water pump, and finally pumped into the boiler drum through the feedwater pump.

Extended Material: About "Demineralized Water".

In daily life, we often see limescale forming on the inner wall of the kettle after a long period of use. What is the reason for this? It turns out that the water we take contains a lot of inorganic salts, such as calcium, magnesium salts, etc.

These salts cannot be found by the naked eye in water at room temperature, and once they are heated and boiled, a lot of calcium and magnesium salts are precipitated in carbonate formation, and they form scale close to the wall of the pot. We usually use the content of calcium and magnesium ions in water as the index of "hardness". A hardness of 1 degree is equivalent to 10 mg of calcium oxide per liter of water.

Water below 8 degrees is called soft water, above 17 degrees is called hard water, and between 8 and 17 degrees is called moderate hard water. Rain, snow, rivers, rivers, and lakes are all soft water, and spring water, deep well water, and sea water are hard water.

The hardness of water is mainly composed of cations: calcium (Ca2+) and magnesium (Mg2+) ions. When the raw water containing hardness passes through the resin layer of the exchanger, the calcium and magnesium ions in the water are adsorbed by the resin, and sodium ions are released at the same time, so that the water flowing out of the exchanger is the softened water that removes the hardness ions, and when the resin adsorbs calcium and magnesium ions to a certain saturation, the hardness of the effluent increases, and the water softener will automatically carry out the regeneration of the failed resin according to the predetermined procedure, and use a higher concentration of sodium chloride solution (brine) through the resin to restore the failed resin to the sodium resin.

EDI technology can be used to replace the traditional mixed bed ion exchange resin to produce pure water or ultrapure water, unlike the mixed bed, the ion exchange resin filled in the EDI freshwater chamber partition can be automatically regenerated without saturation during operation, and does not require chemical regeneration, so that the degree of permeate and effluent quality are very stable. In addition, EDI technology has many advantages, such as uninterrupted water discharge, no acid and alkali reagents in the regeneration process, and fully automatic operation of the device unattended.

The main uses of EDI ultrapure water equipment:

Pure water for ultrasonic cleaning, electroless plating, ultrasonic cleaning, pure water for electrophoresis or ultrapure water.

Surface coating and cleaning of pure water or ultra-pure water for home appliances, building materials, automobiles and other products.

Electroplating (gold plating, silver plating, plating, plastic plating, chrome plating, galvanizing) and other pure water, glass plating with ultrapure water.

Pure water or ultrapure water for other surface treatment requirements.

First of all, what is the main role of the EDI module? As we all know, the main role of EDI is to purify water quality, and to produce ultrapure water through ion exchange technology and electrodialysis technology. The conductivity of ultrapure water is clearly required, and the general water is far from reaching the standard of ultrapure water after being filtered through the reverse osmosis membrane, so the ultrapure water system will add a purification process after reverse osmosis, and the EDI module will be used.

The role of EDI modules in ultrapure water systemsIt is also said that EDI in ultrapure water is mainly to improve the purity of water quality and make the conductivity meet the standard. Before the advent of EDI, many companies used ultrapure water resin for resin purification, but ultrapure water resin needed to be regenerated and replaced regularly. The operation is complicated and requires a special person to manage it.

The EDI module has a high degree of automation and only needs regular maintenance after opening, so the use of EDI in ultrapure water is very high.

The system is also an ion exchange system. This ion exchange system uses a bed of hybrid resins with selective permeable membranes, the main function of which is to further desalination. Electrodeionization systemIn the process, the driving force is a constant electric field, which causes the migration of inorganic ions and charged particles in the water.

Anions move towards the positive electrode (anode) and cations move towards the negative electrode, and the ion-selective permeable membrane ensures that only anions can reach the anode, and that cations can reach the cathode and migrate to prevent reversal. At the same time, the potential energy of the potential electrolyzes the water into oxygen ionization and hydroxide ions, so that the resin can be continuously regenerated without the addition of regenerants.