Use of Circulating Water Treatment Chemicals in Power Plants
Water resources are basic natural resources and strategic economic resources. It is also an important foundation for sustainable socio-economic development, maintaining ecological balance and a harmonious environment.
The power industry is a national economy and an important energy industry. Among the total installed generating the capacity of the country, thermal power generation accounts for more than 70%.
The amount of water used for thermal power generation accounts for 40% of the total industrial water consumption. Due to a large amount of water used in thermal power plants, the problem of water has become a limiting factor in the construction and development of the power industry in the northern region.
Circulating water plays an important role in the production of power plants. During the long-term use of circulating water, scales and microbial colonies are generated in equipment and pipelines. They reduce productivity and affect plant operations and revenue. For this reason, it is very important to use water treatment chemicals in circulating water of power plants.
The following water treatment chemicals are widely used in power plant circulating water treatment.
Compound Scale and Corrosion Inhibitor
Before the operation of the unit, the usual reagents for industrial circulating water are added once according to the amount of water. The concentration of the agent added during the unit operation was controlled at 10 mg/L.
Chemicals were put into the kit at a ratio of 1:3. After dilution with water, the metering pump is used to pump the chemicals into the blender and then into the circulation tank. Control the concentration of organophosphine in circulating water to be greater than or equal to 1.5 mg/L. The staff regularly discharges the circulating water. According to the concentration of copper ions in water, an appropriate amount of water-soluble copper corrosion inhibitor is added to control.
Corrosion inhibitors are polyacrylic acid, sodium polyacrylate, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, polyepoxysuccinic acid (sodium), polyaspartic acid (sodium), PBTC and so on.
Fungicide and Bactericide
The fungicide and bactericide have a strong bactericidal effect on microorganisms in water. Oxidizing fungicides can oxidize other reducing substances in water. When organic matter, hydrogen sulfide, and ferrous ions are present in the water, they consume a portion of the oxidizing biocide and reduce their bactericidal effect.
The halogen elements chlorine, bromine, and iodine are all good oxidizing fungicides. The chlorine source is wide, the price is low, the use is convenient, the sterilization effect is good. And it can be used together with many water treatment agents without mutual interference or interference, and has little environmental pollution, and is widely used as a fungicide for microorganisms for industrial and domestic use. Large circulating cooling water systems use liquid chlorine, and the cooling water system with less usage is usually sodium hypochlorite or bleaching powder.
Oxidizing bactericides are used as conventional bactericides. The oxidizing properties of such medicinal agents can cause corrosion to equipment and facilities, so it is necessary to control the dosage. It is safer to control the effective chlorine at around 1 mg/L and 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.
The fungicides are DDBAC, polyquaternium, isothiazolinone, dibromocyanoacetamide, tetramethyl hydroxy sulfate, and so on.
The power plant uses polyferric sulfate to treat different sewage. This kind of power plant water treatment chemical has technical advantages and economic advantages in water treatment. It can solve the problems of large consumption of water and other dehydration when other chemicals are used to treat water quality. Thereby, the production cost and operating cost of the enterprise are greatly reduced. Polyferric sulfate is especially the most economical and applicable water treatment flocculant for the treatment of electroplating wastewater.
Settling ratio test before using polyaluminum chloride. After obtaining the basic data, polyaluminum chloride was added at the test dose. Its dosage is in the range of 30-120mg/L, and the amount of reagent in the effluent water quality of the filter is increased or decreased during operation.
The chemical was diluted 1:5 with water (the solid agent was diluted 1:15), and the polyaluminum chloride solution was pumped into the coagulation tower using a metering pump. Activated sludge can be added to it in winter to increase the sedimentation effect.
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