What if the scale in cooling water is serious?

Common hot water engineering water treatment methods and evaluation 1, ion exchange method: using specific cation exchange resin to replace calcium and magnesium ions in water with sodium ions. Due to the high solubility of sodium salt, scaling with the increase of temperature is avoided. The main advantages are: the effect is stable and accurate, the process is mature, and the hardness can be reduced to 0. This kind of water softening equipment is generally also called "ion exchanger" (because most of it is sodium ion exchange resin, it is also called "sodium ion exchanger"). Its disadvantages are: (1), it will produce too much regenerated waste liquid, and the cost of air source heat pump is high; (2) The consumption of salt is large and needs to be reduced frequently; (3) The discharge of a large amount of salty wastewater is easy to cause pipeline corrosion, and there are potential safety hazards when using hot water. 2. Electromagnetic method: adding a certain electric field or magnetic field to water to change the characteristics of water molecules, thus changing the deposition speed and physical characteristics of calcium carbonate (magnesium carbonate) and preventing the formation of scale. Its characteristics are: small equipment investment, convenient installation and low operating cost; But the effect is not stable enough, and there is no unified measure. Because the water molecules passing through the magnetic field will return to the state before magnetization in about half an hour, the use time and distance of treated water are limited. From the method point of view, it can only be applied to circulating water treatment, and there is a hard index requirement for magnetic force, and the magnetic field intensity should be above 2000 gauss. The most important thing is that the magnetization function has not been certified, and its feasibility and effectiveness are questioned. 3. Membrane separation method: Both nanofiltration membrane (NF) and reverse osmosis membrane (RO) can intercept calcium and magnesium ions in water, thus fundamentally reducing the hardness of water. The method is characterized by obvious and stable effect and wide application range of treated water; However, the requirement for water inlet pressure is high, and the equipment investment and operation cost are high. 4. Dosing method: Adding special scale inhibitor into water can make calcium and magnesium ions, carbonate ions and medicament molecules form complexes, increase their solubility in high-temperature water, and prevent scale from settling. At present, there are many scale inhibitors that can be used in industry. The commonly used scale inhibitors in water treatment include polyphosphate, organic phosphonic acid, phosphocarboxylic acid, organic phosphonate, polycarboxylic acid and so on. This method has the characteristics of low one-time investment, wide adaptability and strong anti-scaling and descaling ability, and is especially suitable for water storage heaters. However, due to its continuous input of chemicals, the system is more complicated. XI。 The filtration and scale inhibition principle of SBOK prefilter is 1. Germany-owned Shibaokang Water (Nanjing) Co., Ltd. makes full use of Germany's advanced technology in the field of water treatment products and equipment manufacturing and automatic control, and adopts imported raw materials to launch a patented product with scale inhibition, scale removal, anti-corrosion, filtration and automatic sewage discharge. 2. The scale-inhibiting prefilter of Shibaokang mainly adopts stainless steel membrane filtration and dosing method, and its structure mainly adopts two kinds of filter elements, among which: (1) stainless steel filter element: the filtration accuracy can be divided into 5 microns, 50 microns and 100 microns, which can effectively filter out particulate impurities such as rust and mud sand in water, restore the water quality to the factory standard of tap water, and protect the downstream of faucets and showers. (2) Scale-inhibiting filter element: A scale-inhibiting filter element is placed in the stainless steel filter element, and food-grade slow-release polyphosphate is added to the scale-inhibiting filter element, which can react with calcium and magnesium ions in water to prevent calcium and magnesium ions from combining with carbonate ions, thereby preventing scaling and forming a dynamic nano-scale protective film on the inner wall of the water storage tank, thereby preventing and repairing the corrosion of the inner walls of pipelines and containers. Germany's Spokane prefilter realizes automatic sewage discharge function without manual cleaning. It only needs to install a program-controlled relay in the sewage outlet to realize the scheduled sewage discharge, connect the sewage outlet with the faucet or toilet, and realize the automatic flushing when the faucet comes out or the toilet is used. 3.SBOK polyphosphate scale inhibitor principle (1) and SBOK polyphosphate scale inhibitor: it is an economical and effective high-tech product to prevent scaling and corrosion of water supply system. As a food additive, the third generation polyphosphate scale inhibitor is a kind of polyphosphate which is neutralized and melt polymerized at ultra-high temperature (1200℃- 1700℃). Whether it is used for drinking, food processing and bathing, it is harmless to human body. American "FDA" (1) takes colorless, odorless and nontoxic polyphosphate as a drinking water treatment agent and lists it in GRAS(General recombled As Sate) catalogue. The product safety conforms to the Regulations of Beijing Municipality on Sanitary Supervision and Management of Drinking Water and the national GB 1499- 1988 standard. In the United States and Europe, polyphosphate scale inhibitors have been widely used in cold hot water engineering water treatment industry and life. It will also play an indispensable role in the field of water treatment in hot water engineering. (2) Scale inhibition: the main components of polyphosphate effectively inhibit and interfere with the normal growth of calcium carbonate crystals in water, and control the speed of crystal nucleus formation so that it cannot be deposited to form scale; At the same time, calcium, magnesium and iron formed and attached to the inner wall of the tube are complexed or chelated, and then the final dispersion effect is achieved through Brownian motion or water flow. (3) Anticorrosion: A small amount of P-P in polyphosphate isolates the chemical reaction between dissolved oxygen in water and metal ions, and prevents ferrous hydroxide from continuing to react to generate ferric hydroxide, that is, passivation. A self-repairing protective film is formed on the inner wall of the water pipe. This hydrophilic molecular film prevents the corrosion of dissolved oxygen in water, thus inhibiting the corrosion of the inner wall of the water tank or pipeline. (4) Principle of scale and corrosion inhibition of polyphosphate: When the concentration of phosphate-based drinking water treatment agent in water is about 3-5ppM, soluble complex and insoluble nano-scale film will be formed, which will play the role of scale and corrosion inhibition, thus effectively preventing secondary pollution. Metal ions such as calcium (Ga), magnesium (Mg) and iron (Fe) contained in water can easily form insoluble substances such as calcium carbonate and magnesium carbonate on the inner wall of water supply pipeline. Polyphosphate in drinking water treatment agent can react with the above metal ions to form soluble complexes, inhibit the generation of calcium carbonate and magnesium carbonate, and disperse them in water. After reacting with iron ions, a dynamic protective film is formed on the inner wall of the pipeline to achieve the function of corrosion prevention and scale prevention. Twelve. Scope of application of SBOK prefilter: ◆ Suitable for solar water heaters, heat pumps, electric water heaters, gas water heaters and electric instant water heaters; ◆ Suitable for hot water boilers, heat exchangers, central heating systems, cooling water systems and cooling systems of various machines; ◆ Widely used in hot water or other water supply pipes in homes, hotels, restaurants, residential buildings, hospitals, schools, bathing sauna centers and factories, which can prevent scaling and corrosion, and is the nemesis of "red water", "black water" and "yellow water" and scale; ◆ Anti-corrosion and scale inhibition of heating systems such as electric tea stoves and electric water boilers; ◆ Agricultural irrigation (such as pre-filtration of micro-irrigation and drip irrigation systems) system; ◆ Anti-corrosion and scale inhibition of central air conditioning cooling circulation pipeline, process cooling circulation pipeline and equipment. XIII. Maintenance method of SBOK pre-installation 1, installation method: (1) Close the water inlet valve and cut off the water supply; (2) Remove the filter shell and outer plastic film of the scale-inhibiting filter element; (3) putting the scale-inhibiting filter element into the stainless steel filter element, and pressing the stainless steel filter element in place along the axial direction of the filter lower shell; (4) Close the filter housing and tighten the upper and lower housings by hand; (5) At the outlet of the filter, a water pipe can be specially connected to the faucet or toilet to realize the automatic flushing of the filter element; You can also connect a copper ball valve, when the valve is opened, the sewage can be discharged; (6) Connect the filter into the pipeline system, open the water inlet valve, and check whether there is water leakage at the installation and joint. 2. Maintenance method: (1), close the water inlet valve, cut off the water supply, and open the filter drain valve to release the pressure; (2) Remove the filter housing, and take out the stainless steel filter element and the scale filter element; (3) Clean the shell, stainless steel filter element and anti-scaling filter element with clear water, and brush off dirt that is difficult to remove with a little detergent. Do not use a metal brush, otherwise it will damage the stainless steel filter element; (4) putting the scale-inhibiting filter element into the stainless steel filter element, and pressing the stainless steel filter element in place along the axial direction of the filter lower shell; (5) Close the filter housing and tighten the upper and lower housings by hand; (6) Connect the filter into the pipeline system, close the water inlet valve, and check whether there is water leakage at the installation and joint. 3. Precautions for installation and maintenance: (1) When installing the filter, please install the water inlet and outlet pipes in the direction of the water flow arrow marked on the filter shell, and do not connect them backwards to avoid damaging the filter element; (2) When installing the filter on the pipeline, it is recommended to use the union connection, which is beneficial to the future maintenance; (3) It is suggested to use PTFE or silicone rubber sealing material at the inlet and outlet interfaces; (4) Install a stop valve in front of the filter for future maintenance.