Water quality and effluent water treatment process by the impact of power plant water treatment process directly affects the quality and efficiency of power generation. Effective treatment of natural water in power plants can not only increase water quality and clean water production, but also increase the power plant's power generation efficiency. The article analyzes the power plant water treatment process, and puts forward the water treatment process optimization strategy, aimed at improving the power plant power generation efficiency. 1 Overview Through long-term practical experience, people find out the safety conditions of thermal equipment in power plants and whether the power plants can be economically affected by the quality of water in the thermal system. Natural water, which has been untreated and contains many impurities, enters the water vapor circulation system in the thermal system and contains impurities to damage the thermal equipment. To ensure good water quality in the thermal system, it is necessary to purify the water and to exercise strict supervision over the quality of the soda water. 2, power plant water treatment system process 2.1 pretreatment The first process of power plant boiler water treatment process is water supply pretreatment, the process includes coagulation, sedimentation clarification and filtration, after these several work will remove suspended solids and colloidal substances in water to ensure low levels of suspended solids in water At 5 mg / L, the final clear water. After the water pretreatment, but also need to be processed according to different purposes. If the power plant as a boiler water, you must also use reverse osmosis and ion exchange method to remove water soluble salts; with heating, vacuum and blast method to remove dissolved gases in water. 2.2 make-up water treatment Power plant water treatment methods and more use of reverse osmosis and ion exchange. Ultrafiltration can be used as a pre-treatment of reverse osmosis infiltration in the make-up water treatment system. It can effectively remove colloids and other particles in water, make the quality of reverse osmosis influent water, reduce the pollution of reverse osmosis membrane and extend the length of reverse osmosis membrane The service life. 2.3 condensate treatment Thermal power plant boiler feed water from the turbine condensate and boiler make up water, condensate water is the main component of the boiler feed water, its amount accounted for more than 90% of the total boiler feed water. Condensate contains suspended solids and metal corrosion, in the mixed bed desalination, can be removed by filtration, in order to ensure the effective operation of mixed bed equipment. The filtration equipment used in the power plant at this stage mainly covers two types of filters and electromagnetic filters. 2.4 recycled water treatment There are many power plant circulating water treatment processes, such as steady water, acid, lime softening, weak acid ion softening and membrane treatment technology. In the national water policy requirements, thermal power plants, especially the use of dry ash removal process of thermal power plants, to be recycled water in this part of the water-saving, in order to improve the concentration of circulating water as a prerequisite for the make-up water and sewage Reduce water consumption, thereby reducing the amount of fresh water. 2.5 Wastewater Treatment Due to the nature and composition of the wastewater is complex, often only through a unit of equipment can not meet the processing requirements, it is necessary to combine several unit equipment into an organic whole, and the rational design of the primary and secondary relationships and the sequence before and after to ensure reasonable, Effective treatment of wastewater, the organic unit of the unit to form the overall combination, we call the wastewater treatment process. 3, water treatment technology - a full membrane water treatment process as an example 3.1 full membrane water treatment process evaluation The whole membrane water treatment process instead of the traditional use of sand filtration and ion exchange process, this water treatment process is used semi-permeable membrane way to deal with water. Full membrane water treatment process is used in membrane treatment process, the process is used in reverse osmosis and ultrafiltration systems. At this stage all membrane water treatment process more mature, supporting product prices are also declining, this water treatment process more and more thermal power plants welcome. 3.2 full membrane water treatment process The whole membrane water treatment process uses a membrane liquid separation method, there are four main methods of separation, namely microfiltration, ultrafiltration, nanofiltration and reverse osmosis, the accuracy of different requirements, the use of separation methods are different. The whole membrane water treatment process of electric desalination process, the use of electrodialysis technology, the ion exchange resin regeneration to be achieved. In view of the electrical desalination process, it is often divided into membrane separation methods. At this stage, the power plant using full membrane treatment process mainly reverse osmosis, ultrafiltration and electrical desalination. 3.2.1 Reverse osmosis. Reverse osmosis (RO) technology. We usually refer to a membrane that has the choice of which substance to pass through as a semi-permeable membrane. For example, both sides of the container are respectively placed dilute solution and concentrated solution with the same volume, and the semi-permeable membrane is used to separate the two solutions. The dilute solution naturally flows toward the concentrated solution. At this time, the height of the concentrated solution Will be higher than the dilute solution, so concentrated solution and dilute solution will form a pressure difference between the pressure difference in this role, we can dilute solution and concentrated solution to reach equilibrium, we call this pressure difference as penetration Pressure If the side of the concentrated solution to exert an external force is greater than the pressure of osmotic pressure, it will make the concentrated solution of solvent to dilute solution, this time the direction of solution flow will be the original direction, we will this Infiltration is called reverse osmosis. 3.2.2 ultrafiltration. Ultrafiltration (UF) technology is a pressure-driven screening process with pore sizes in the range of 0.001-0.19 μm (MWCO of about dalton). For water suspended solids, colloids, macromolecules, bacteria have a higher removal rate, the removal of BOD and COD in part. Water filtration through the membrane can be reduced to 0.2NTU turbidity and below, SDI is not greater than 1.0 for the RO device for deep desalination. hangzhou mankun imp. exp. co., ltd. , https://www.multihzs.com
[Dry goods] power plant water treatment process and optimization design analysis