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Circulating cooling water dosing device operating rules of the dosing method According to the system status and characteristics of water treatment chemicals, sterilization can be directly added to the algicide pool. Dosing and corrosion inhibitor for the dosing method is: in the circulating cooling water pool next to the allocation of a dispensing tank, dispensing tank upper part of the water pipe, the lower part of the sewage outfall, pharmacy to join the dispensing tank diluted with supplementary water, continuous with the metering pump Evenly and gradually added to the pool: Dosing position Do not enter the circulating water system is directly discharged; Pharmacy in the pool to have a mixed time to make it mixed evenly; Do not close to the entrance of a pump dosing, This will result in non-uniform distribution of drug concentration. Dosing method (1) scale and corrosion inhibitor to join the method: according to the amount of the pharmaceutical agent has been added to wash the bucket, stirring constantly add water to dilute the pharmaceutical agent 3 to 5 times (diluted in order to balance the dosing time , According to the need can not be diluted), mixing, open the dosing pump regulating dosing valve, so that the pharmaceutical added to the pool pool in a row, and control within 20 to 24 hours plus finished. (2) the addition of germicidal algicide: the impact of intermittent dosing way to operate, according to the amount of the drug directly into the catchment pool, so that circulating water in a period of time to maintain a considerable concentration of agents, in order to obtain the most effective killing And peeling effect.
Several Kinds of Circulating Water Treatment Agents Used in Industrial Water Treatment 1. Corrosion and scale inhibitor, this product is a complex product. Many monomers such as HEDP, ATMP and other effects of a single (some products only corrosion inhibition, and some only scale inhibition, etc.), a variety of monomers combined with enhanced role. 2. Bactericidal algicide, there are different types of products, our factory can produce supply of oxidizing fungicides, non-oxidizing fungicide. In order to avoid bacterial resistance, it is recommended that these two fungicides are used interchangeably. 3. Adhesive stripping agent, circulating cooling water system Many companies use open, sand and dust, coupled with the growth of bacteria and microbial sludge is easy to adhere to the surface of the pipe, causing corrosion, regular addition of slime stripping agent to solve this problem. 4. Pre-film condenser, the new system boot or the old system shutdown restart, the cooling water system needs cleaning pre-film. Condenser pre-filming agent role is to make the surface layer of the protective layer of pipe system, play a role in passivation.
In order to meet the needs of water treatment applications, reverse osmosis membrane must have the reliability of the application and the economies of scale, the general requirements are: (1) the permeability of water should be large, high desalination rate. (2) has a certain degree of strength and firmness, and will not be due to the impact of water pressure and tension deformation, rupture. The membrane is compacted as little as possible, water flux attenuation is small, to ensure a stable water production. (3) the structure should be uniform, can be made into the required structure. (4) to adapt to greater pressure, temperature and water quality changes. (5) has a good temperature, Naisuan Jian, resistance to oxidation, hydrolysis and resistance to biological pollution. (6) long service life. (7) low cost. Based on the above requirements, membrane users in the election of the film or before using the film, should understand and master the physical, chemical stability and membrane separation characteristics of indicators.
Power plant recycling water treatment chemicals in the application process mainly in the following categories: 1. Fungicides: in the unit operation to add oxidized fungicide. Oxidative fungicides as conventional fungicides, the oxidizing agent of the equipment will cause corrosion of facilities, so to control the amount of available chlorine is controlled at about 1 mg / L is safe, and need to control the sterilization time. Non-oxidizing fungicides should also be added during the operation of the unit, generally in the spring, summer and autumn, quarterly or quarterly impact dosing, 2. Compound Scale and Corrosion Inhibitor: Before the operation of the unit, the dosage of the water is added to the industrial circulating water once, the commonly used pharmaceutical agent is completed, the concentration of the medicine is controlled at 10mg / L, the operation of the unit is added: 1: 3 , Diluted with water, with a metering pump pump mixed into the mixing device, and then into the circulation pool. Control the concentration of organic phosphine in circulating water greater than or equal to 1.5 mg / L, regularly carry out sewage on the circulating water. Depending on the concentration of copper ions in water, add appropriate amount of water-soluble copper corrosion inhibitor to be controlled. 3. PAC: Before use to do the settlement than the test, to obtain the basic data, according to the experimental dose added. Dosage in the range of 30 ~ 120mg / L, running as the filtrate water quality increase or decrease the amount of reagent. Dilute the solution in 1: 5 dilution with water (1: 15 dilution of the solid agent) and pump the solution into the coagulation tower using a metering pump. Active silt can be added in winter to increase sedimentation. 4. Poly-ferric sulfate: poly-ferric sulfate used in power plants can handle different sewage. This kind of power plant water treatment agent has the technical superiority and the economic superiority in the water treatment, can solve the other pharmaceutical treatment water quality when the medicine quantity big dehydration is more difficult and so on the question, thus largely reduced the enterprise production cost and the running expense. Especially for the electroplating wastewater treatment reuse is the most cost-effective, applicability of water treatment flocculant.
In order to meet the needs of different wastewater systems (such as papermaking wastewater, printing and dyeing wastewater, food processing wastewater, etc.), specificity, for a particular type of chemical species research and development is imperative. Water treatment chemicals is an important aspect of new water treatment chemicals. The emergence of such new water treatment technologies will open up the production and application scope of water treatment chemicals, which will greatly promote the development of industrial water treatment by chemical method. Water treatment agents can improve corrosion inhibition efficiency, expand the use of corrosion inhibitors, so that it applies to more demanding more extensive environment, and reduce pharmaceutical costs. This is an important part of the theoretical research on corrosion inhibitors of water treatment chemicals. The standard of water treatment agent refers to the key factors such as the interaction between corrosion inhibitor molecules, the interaction between inhibitor molecule and interface, and the geometrical position of the molecule at the molecular level due to the interaction of different corrosion inhibitor molecular characteristic groups on the metal surface Changes, so that the adsorption layer is more dense, increase and enhance the protective properties of corrosion resistance. To establish a molecular model of water treatment agents with synergistic effects, we need to consider the effect of interfacial agents on interface atoms and the force of interfaces at different atomic centers. It is difficult to introduce more quantum parameters and calculations. The research work is of great theoretical and practical value, especially for the future water treatment corrosion inhibitors affect the metal surface chemical and electrochemical processes and the design of specific molecules of water treatment agents has a decisive role, it is an important basic theoretical research and Application of basic research is the future of water treatment mechanism of important research direction. The current high-performance new water treatment chemicals generally high prices, through the search for cheap raw materials to develop high-performance products, but also by strengthening the complex technology research, that is, add cheap auxiliaries to reduce the actual dosage of pharmaceutical , While maintaining water purification efficiency and reduce the cost of the purpose.
At present, China's emphasis on the management of the environment is growing, water treatment manufacturers have sprung up. A variety of water treatment agents enrich the market, but the type of water treatment chemicals is nothing more than a few, faceted Xiaobian to introduce you to the types of water treatment agents to facilitate your needs. Fungicide Also known as sterilization algicide or sludge stripping agent, anti-sludge agent, refers to a class of bacteria used to inhibit the growth of bacteria and other bacteria in order to prevent the formation of microbial sludge of chemicals. Usually divided into oxidizing fungicides and non-oxidizing fungicides two categories. Oxidative fungicides, such as commonly used chlorine, sodium hypochlorite, bleaching powder, etc .; non-oxidative fungicides in good effect, the more widely used is to destroy the bacterial cell wall and cytoplasmic chemicals, such as quaternary ammonium salts. Quaternary ammonium salt such as dodecyldimethyl benzyl ammonium chloride (1227) or bromide dodecyl dimethyl benzyl ammonium, etc., often both sterilization, stripping, corrosion inhibition and other effects, there are Development prospects, has been used in oilfield water, industrial cooling water and so on. Inhibitor Also known as anti-scaling agent, refers to a class of water can inhibit calcium, magnesium and other scale into the formation of scale scale salts of chemicals. Inorganic inhibitors such as sodium hexametaphosphate, sodium tripolyphosphate, etc .; organic, polymer scale inhibitor, in which the best effect of polymer scale inhibitor, has great development prospects. There are two kinds of organic and macromolecular scale inhibitors used in water treatment: (1) organic phosphonic acids such as DTPMPA (diethylenetriamine pentamethylene phosphonic acid), EDTMP (ethylene diamine tetramethylene phosphonic acid ), HEDP (hydroxy ethylidene diphosphonic acid); ② polycarboxylic acid, such as polyacrylic acid salt PAA (S), hydrolyzed polymaleic anhydride HPMA and so on. The scale inhibition of these two types of scale inhibitors is usually achieved through lattice distortion and dispersion-condensation, and is widely used in oilfield water, boiler water and industrial cooling water systems. Flocculant A class of chemicals used to remove or reduce turbidity or suspended solids in water and to speed up the settling of impurities and sludge in water. Flocculant is the first application of inorganic flocculants, such as alum, ferric chloride and so on. Organic and polymeric flocculants are widely used in flocculants for water and wastewater treatment. Can be divided into anionic flocculants, such as carboxymethyl cellulose, sodium polyacrylate, etc .; cationic flocculants, such as polyethylene amine; there are non-ionic flocculants, such as polyacrylamide. Their flocculation is mainly through the charge neutralization, adsorption bridging effect to achieve. Corrosion inhibitor A class of appropriate concentration and form of dosing in the water, you can prevent or slow down the water on the metal materials or equipment, chemical corrosion, with good results, with less, easy to use and so on. Many types and varieties of corrosion inhibitors, according to the types of compounds can be divided into inorganic and organic corrosion inhibitor corrosion inhibitor. According to its inhibition reaction is anodic reaction, cathodic reaction or both, can be divided into anode type corrosion inhibitor, cathode type inhibitor or mixed type corrosion inhibitor. Corrosion inhibitors can also be formed on the metal surface in accordance with the mechanism of the protective film is divided into passive film type, the type of film and adsorption membrane type adsorption. At present, the commonly used in the water treatment of passive film inhibitor such as chromate, nitrite, molybdate, etc .; commonly used precipitation film type inhibitor of polymerized phosphate, zinc salts; commonly used adsorption film Type corrosion inhibitors such as organic amines. In the pretreatment step of the water treatment, a class of chemicals capable of previously forming a protective film on the surface of the metal. The purpose of pre-film has two: First, the use of chemicals to improve the initial concentration of corrosion inhibition; the second is to use a dedicated pre-filming agent in order to normal operation, adding a small amount of corrosion inhibitor, can Maintenance and repair of protective film, saving drugs and costs. Commonly used pre-filming agents are sodium hexametaphosphate plus zinc salt, sodium tripolyphosphate and so on. Oilfield water treatment in the application of a special chemical, can remove the oily sewage in the mechanical impurities and oil, its role in addition to the separation of suspended solids from the flocculant or mechanical impurities, but also has the role of oil and water purification purification. Therefore, this cleaning agent in addition to containing the general flocculant components such as aluminum, polyacrylamide, etc., often contain some surfactants. For the purifying effect of purification, the general use of thin-film filter to be measured, with the filter factor (see filter), said the size of the purification effect is good or bad. detergent A class of cleaning chemicals. In the pretreatment step of water treatment, some chemicals are often needed to clean the deposits on the surface of metal equipment, such as corrosion products and scale, as well as microbial slime and so on. According to the different requirements of cleaning, cleaning agents can be divided into acid cleaning agents such as hydrochloric acid, sulfuric acid, hydrofluoric acid, citric acid, etc .; passivation agent such as sodium benzoate. At present, the use of sulfonated succinate di (α-ethylhexyl) sodium salt, it is a surfactant, as a special cleaning agent for cleaning metal surface oil and floating rust and other impurities.
It is the sacred mission and goal of every Dongtao chemical worker, as well as our solemn promise and heroic oath for the new century! It will inspire us to forge ahead and create a better tomorrow! We must through the adjustment, reorganization, mergers and acquisitions and a series of strategic measures to build first-class enterprise groups, establish the status of the industry.Only in the product and technology, to create a first-class, First-class, we will have excellent brand; only in management and service to create first-class, we will have a good reputation.To build first-class, need to insist on goals, determined to do the work fine, In short, everything can be adjusted, the only way to maintain and lead us only the core of our culture, only the persistence of beliefs can bring sustained growth of enterprises, only the unity of the will to train a good team. Dongtao Chemical's core values: to create value for customers, partners, society and employees as the premise, promote and develop the national culture, with a high degree of integrity of the spirit of cooperation, to provide high-level professional advisory services, the company Construction of China's most outstanding chemical companies. Zaozhuang City Dongtao Chemical Technology Co., Ltd. specializes in the field of water treatment agent for the development, production and sales. In 2010, a new modern production base, water quality stabilizer monomer production scale of 30,000 tons, and adopted the ISO 9001: 2008 quality management system certification. Product quality through the Shandong Provincial Entry-Exit Inspection and Quarantine Bureau of Chemical and Mineral Products Testing Center and Zaozhuang City Product Quality Supervision, Inspection and testing to ensure product quality and supply stability. Products are widely used in iron and steel, petrochemical, power, textile, printing and dyeing, paper and other industries. Follow the quality of survival, in good faith and development, service and efficient business philosophy. We sincerely welcome guests at home and abroad to visit the company guidance business negotiations and common development.
Industrial circulating cooling water in the course of running a large number of microorganisms and other fungi, if not treated in time, a large number of microorganisms and their bodies can be suspended in the circulating water and other impurities intertwined together to form a viscous viscous material, which The substance can be attached to the inner wall of the pipe, slippery and greasy, is a bad conductor of heat, thermal conductivity is very poor, compared to stainless steel is still less than 1% of its thermal conductivity, resulting in heat transfer effect Significantly decreased, greatly increasing the production load, while increasing the cost of production, making the unit energy consumption continues to increase. Therefore, the removal of circulating water microorganisms and other impurities is necessary, for that expensive medium-sized equipment, the addition of related sterilization water treatment agent (such as: 1227 fungicide) is the most effective and most direct and most economical method. The following Xiaobian to talk about a number of circulating fungi for efficient fungicides, water treatment agent One: 1227 type fungicide Speaking of the 1227 fungicide, it can not be said that the effect is significant, it can be said is one of the best fungicide. Said the fungicide for the emperor is not an exaggeration. This is why? 1227 Fungicides are non-oxidative fungicides, colorless non-toxic, the water itself is small, for microbes and other fungi with high efficiency, broad-spectrum bactericidal effect, the effect is very significant. In the application of sterilization at the same time also has the role of slime stripping agent for slime peel, penetration dispersion effect is very good, this is not its full effect, in addition, also has degreasing, deodorant and corrosion inhibition effect. Therefore, chemical, textile, power and other circulating water is widely used to control the breeding of algae in circulating water microorganisms, for the sulfate-reducing bacteria have a strong role in the killing. Second, isothiazolinone fungicide Isothiazolinone sterilization effect is fundamental, can fundamentally block microbial cell differentiation and reproduction, that is, to sterilization, with high efficiency, broad-spectrum, low toxicity, non-oxidizing and so on. Is currently widely used fungicide one, mainly for paper, textile, pesticides, leather, ink and other industries. If the increased dose has a significant effect on the slime peeling agent. Third, the chlorine dioxide solution ClO2 Chlorine dioxide is a strong oxidant, non-carcinogenic, non-teratogenic, no mutation. Chlorine dioxide compared with chlorine has the following advantages: not only can kill the general micro-organisms, but also has the role of fungal spores, killing the virus; not with ammonia, phenols and unsaturated compounds; PH change on the sterilization effect is very small, so Especially for circulating water for the fertilizer plant as a biocide; can completely replace the chlorine and non-oxidizing biocides, so very economical. Fourth, excellent net chlorine fungicide Excellent chlorine soluble in water, with high efficiency, fast, broad-spectrum, security and other characteristics, have a strong killing effect, at 20ppm, the sterilization rate of 99%.
Industrial circulating cooling water system in the course of running, due to water evaporation, wind loss and so on to make the circulating water concentration, which contains excessive salt, anion and cation increase, pH significantly change, resulting in deterioration of water quality, and circulating water Temperature, pH value and nutrient content are beneficial to the propagation of microorganisms. The sufficient sunlight on the cooling tower is the ideal place for algae growth. The scaling control and corrosion control, microbial control, etc., the inevitable need for recycling water treatment. The main problems in the process of circulating water running: (1) Scale: As the circulating water in the cooling process of continuous evaporation, so that the salt concentration in water continues to increase, more than the solubility of certain salts and precipitation. Common are calcium carbonate, calcium phosphate, magnesium silicate and other dirt. Scale texture is relatively dense, greatly reducing the heat transfer efficiency, 0.6 mm thick scale on the heat transfer coefficient decreased by 20%. (2) dirt: dirt mainly by the organic matter in the water, microbial colonies and secretions, sediment, dust and other composition, dirt texture soft, not only reduces the heat transfer efficiency but also caused corrosion under the scale and shorten equipment life. (3) corrosion: the corrosion of circulating water on the heat transfer equipment, mainly electrochemical corrosion, the causes of equipment manufacturing defects, adequate oxygen in water, corrosive ions in water (Cl-, Fe2 +, Cu2 +) and microbial secretion of mucus Generation of dirt and other factors, the consequences of corrosion is very serious, without control of a very short time even if the heat exchanger, water pipeline equipment scrapped. (4) microbial slime: because the circulating water dissolved in sufficient oxygen, the appropriate temperature and the conditions of enrichment, it is suitable for microbial growth and reproduction, if not promptly control will lead to deterioration of water quality, smelly, black, cooling tower Sticky dirt deposition or even blocked, cooling cooling effect dropped significantly, equipment corrosion increased. Therefore, circulating water treatment must control the propagation of microorganisms. Microbial hazards Microorganisms in circulating cooling water come from two aspects. First, the cooling tower in the water evaporation process requires the introduction of a large number of air, microbes with air into the cooling water, the second is the cooling water system will have more or less added water, these microbes also with the supplementary water into the cooling water System. Algae in the sunlight, and water carbon dioxide, bicarbonate and other carbon source photosynthesis, absorption of carbon as nutrients and release oxygen, so when the algae multiply, it will increase the dissolved oxygen content in the water is conducive to oxygen Of the depolarization, the corrosion process is thus accelerated. Microorganisms in the circulating water system in a large number of breeding, will make the water color black, the occurrence of stench, pollute the environment. At the same time, will form a large number of slime cooling tower to reduce the cooling efficiency, wood deterioration rot. Slime deposited in the heat exchanger, so that the heat transfer efficiency and head loss increases, deposited on the metal surface of the sludge will cause serious corrosion under the scale, and it also cut off the corrosion inhibitor on the role of metal, so that Pharmacy can not play the necessary corrosion and scale inhibition. In addition to microbial sludge will accelerate corrosion under the scale, some bacteria in the metabolic process, biological secretions will be directly on the metal corrosion. All of these problems lead to long-term safe operation of circulating water systems, affecting production, resulting in serious economic losses, so the hazards of micro-organisms and scale, corrosion on the cooling water system is as serious as harm, and even can be compared, Microbiological hazards are paramount. The trends of microorganisms in the circulating water can be measured by the following chemical analysis items: (1) residual chlorine (free chlorine) Chlorine sterilization should pay attention to residual chlorine occurs time and residual chlorine, because the microbial breeding serious cycle of water consumption will greatly increase the chlorine consumption. (2) Ammonia circulating water generally does not contain ammonia, but because the process medium leakage or inhalation of ammonia in the water will also contain ammonia, this time can not be taken lightly, in addition to actively looking for ammonia leakage, but also pay attention to whether the water Containing nitrite, the water content of ammonia is preferably controlled at 10mg / l or less. (3) NO2 - when the water containing ammonia and nitrite, it is said that the water has been nitrite bacteria will be converted to nitrite nitrite, then the circulating water system will become very difficult chlorine, chlorine consumption increased, Residual chlorine is difficult to achieve the target, the water content of the best control of NO2 - is less than 1mg / l. (4) chemical oxygen demand of microorganisms in the water will cause serious COD increase, because bacteria increase the mucus of the water content of organic matter, so the analysis of chemical oxygen demand can be observed in the water changes in microbial trends, under normal circumstances the water COD is preferably less than 5 mg / l (KMnO4 method). The harm caused by microorganisms in circulating water is very serious, if you want to take harm after the microbial measures are often less effective but also cost a lot of biocides and money. Therefore, it is necessary to thoroughly monitor the microbial condition of circulating cooling water beforehand. Concentration of water Circulating water concentration factor refers to the circulating water system in the operation process, due to water evaporation, wind loss and so on to make the circulating water concentration ratio (to make up water as a benchmark for comparison), it is an important measure of water quality control is important Comprehensive index. High concentration of water can reduce the amount of water treatment costs; but the concentration is too high, the tendency of the scaling of water will increase, the water concentration is low, water consumption, sewage volume are large and the effectiveness of water treatment agents are not fully into play; Scale control and corrosion control will increase the difficulty of water treatment agents will fail, is not conducive to microbial control, so the cycle of water concentration factor to have a reasonable control index. Scale formation In the circulating water system, the scale is formed by the supersaturated water-soluble components, water dissolved in a variety of salts, such as bicarbonate, carbonate, chloride, silicate, which dissolved in hydrogen carbonate Salts such as Ca (HCO3) 2, Mg (HCO3) 2 Most unstable, very easy to produce carbonates decomposition, so when the cooling water dissolved bicarbonate more, the water flow through the heat exchanger surface, especially the higher temperature surface, it will heat decomposition; water soluble phosphate And calcium ions, calcium carbonate will also produce precipitation; calcium carbonate and Ca3 (PO4) 2 are difficult to dissolve with the general salt is also different, the solubility is not increased with increasing temperature, but with the The temperature decreases. Therefore, these insoluble salts easily reach the supersaturation state in the heat transfer surface of the heat exchanger and crystallize in water, especially when the water flow speed is small or the heat transfer surface is rough, these crystal precipitates will be deposited on the heat transfer surface , The formation of the so-called scale, because these scale crystallization dense, relatively hard, also known as hard dirt, common scale components: calcium carbonate, calcium sulfate, calcium phosphate, magnesium salt, silicate. Circulating water treatment technology According to the characteristics of the enterprise circulating water system and process conditions, combined with local water quality characteristics, select the appropriate conditions for the operation of water treatment program, through dosing and other measures to control the circulating water indicators within a certain range of operation, both to ensure long-term production equipment Operation, but also improve the utilization of recycled water. The use of recycled water treatment technology, both to the enterprise to bring significant economic benefits, but also for the community to bring good social benefits. So the application of circulating water treatment technology is very necessary.
Industrial circulating cooling water system in the course of running, due to evaporation of water, wind loss, and so on the circulating water concentration, which contains excessive salt, anion and cation increase, pH significantly changes, resulting in deterioration of water quality, and circulating water Temperature, pH value and nutrient content are beneficial to the propagation of microorganisms. The sufficient sunlight on the cooling tower is the ideal place for algae growth. The scaling control and corrosion control, microbial control, etc., the inevitable need for recycling water treatment. The main problems in the process of circulating water running: (1) Scale: As the circulating water in the cooling process of continuous evaporation, so that the salt concentration in water continues to increase, more than the solubility of certain salts and precipitation. Common are calcium carbonate, calcium phosphate, magnesium silicate and other dirt. Scale texture is relatively dense, greatly reducing the heat transfer efficiency, 0.6 mm thick scale on the heat transfer coefficient decreased by 20%. (2) dirt: dirt mainly by the organic matter in the water, microbial colonies and secretions, sediment, dust and other composition, dirt texture soft, not only reduces the heat transfer efficiency but also caused corrosion under the scale and shorten equipment life. (3) corrosion: the corrosion of circulating water on the heat transfer equipment, mainly electrochemical corrosion, the causes of equipment manufacturing defects, adequate oxygen in water, corrosive ions in water (Cl-, Fe2 +, Cu2 +) and microbial secretion of mucus Generation of dirt and other factors, the consequences of corrosion is very serious, without control of a very short time even if the heat exchanger, water pipeline equipment scrapped. (4) microbial slime: because the circulating water dissolved in sufficient oxygen, the appropriate temperature and the conditions of enrichment, it is suitable for microbial growth and reproduction, if not promptly control will lead to deterioration of water quality, smelly, black, cooling tower Sticky dirt deposition or even blocked, cooling cooling effect dropped significantly, equipment corrosion increased. Therefore, circulating water treatment must control the propagation of microorganisms. Microbial hazards Microorganisms in circulating cooling water come from two aspects. First, the cooling tower in the water evaporation process requires the introduction of a large number of air, microbes with air into the cooling water, the second is the cooling water system will have more or less make up the water, these microbes also with the supplementary water into the cooling water System. Algae in the sunlight, and water carbon dioxide, bicarbonate and other carbon source photosynthesis, absorption of carbon as nutrients and release oxygen, so when the algae multiply, it will increase the dissolved oxygen content in the water is conducive to oxygen Of the depolarization, the corrosion process is thus accelerated. Microorganisms in the circulating water system in a large number of breeding, will make the water color black, the occurrence of stench, pollute the environment. At the same time, will form a large number of slime cooling tower to reduce the cooling efficiency, wood deterioration rot. Slime deposited in the heat exchanger, so that the heat transfer efficiency and head loss increases, deposited on the metal surface of the sludge will cause serious corrosion under the scale, but it also cut off the corrosion inhibitor on the role of metal, so that Pharmacy can not play the necessary corrosion and scale inhibition. In addition to microbial sludge will accelerate corrosion under the scale, some bacteria in the metabolic process, biological secretions will be directly on the metal corrosion. All of these problems lead to long-term safe operation of circulating water systems, affecting production, resulting in serious economic losses, therefore, microbial hazards and scale, corrosion on the cooling water system is as serious as harm, or even that the three control Microbiological hazards are paramount. The trends of microorganisms in the circulating water can be measured by the following chemical analysis items: (1) residual chlorine (free chlorine) Chlorine sterilization should pay attention to residual chlorine occurs time and residual chlorine, because the microbial breeding serious cycle of water consumption will greatly increase the chlorine consumption. (2) Ammonia circulating water generally does not contain ammonia, but because the process medium leakage or inhalation of ammonia in the water will also contain ammonia, this time can not be taken lightly, in addition to actively looking for ammonia leakage, but also pay attention to whether the water Containing nitrite, the water content of ammonia is preferably controlled at 10mg / l or less. (3) NO2 - when the water containing ammonia and nitrite, it is said that the water has been nitrite bacteria will be converted to nitrite nitrite, then the circulating water system will become very difficult chlorine, chlorine consumption increased, Residual chlorine is difficult to achieve the target, the water content of the best control of NO2 - is less than 1mg / l. (4) chemical oxygen demand of microorganisms in the water will cause serious COD increase, because bacteria increase the mucus of the water content of organic matter, so the analysis of chemical oxygen demand can be observed in the water changes in microbial trends, under normal circumstances the water COD is preferably less than 5 mg / l (KMnO4 method). The harm caused by microorganisms in circulating water is very serious, if you want to take harm after the microbial measures are often less effective but also cost a lot of biocides and money. Therefore, it is necessary to thoroughly monitor the microbial condition of circulating cooling water beforehand. Concentration of water Circulating water concentration factor refers to the circulating water system in the operation process, due to water evaporation, wind loss and so on to make the circulating water concentration ratio (to make up the water as a benchmark for comparison), it is an important measure of water quality control is important Comprehensive index. High concentration of water can reduce the amount of water treatment costs; But the concentration is too high, the tendency of the scaling of water will increase, the water concentration is low, water consumption, sewage volume is large and the effectiveness of water treatment agents are not fully into play; Scale control and corrosion control will increase the difficulty of water treatment agents will fail, is not conducive to microbial control, so the cycle of water concentration factor to have a reasonable control index. Scale formation In the circulating water system, the scale is formed by the supersaturated water-soluble components, water dissolved in a variety of salts, such as bicarbonate, carbonate, chloride, silicate, which dissolved in hydrogen carbonate Salts such as Ca (HCO3) 2, Mg (HCO3) 2 Most unstable, very easy to produce carbonates decomposition, so when the cooling water dissolved bicarbonate more, the water flow through the heat exchanger surface, especially the higher temperature surface, it will heat decomposition; water soluble phosphate And calcium ions, calcium carbonate will also produce precipitation; calcium carbonate and Ca3 (PO4) 2 are difficult to dissolve with the general salt is also different, the solubility is not increased with increasing temperature, but with the The temperature decreases. Therefore, these insoluble salts easily reach the supersaturation state in the heat transfer surface of the heat exchanger and crystallize in water, especially when the water flow speed is small or the heat transfer surface is rough, these crystal precipitates will be deposited on the heat transfer surface , The formation of the so-called scale, because these scale crystallization dense, relatively hard, also known as hard dirt, common scale components: calcium carbonate, calcium sulfate, calcium phosphate, magnesium salt, silicate. Circulating water treatment technology According to the characteristics of the enterprise circulating water system and process conditions, combined with the local water quality characteristics, select the appropriate conditions for the operation of the water treatment program, through dosing and other measures to control circulating water indicators within a certain range of operation, both to ensure long-term production equipment Operation, but also improve the utilization of recycled water. The use of recycled water treatment technology, both to the enterprise to bring significant economic benefits, but also for the community to bring good social benefits. So the application of circulating water treatment technology is very necessary.

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