Who will save boiler waste water pollution problem

In the power industry, relying on boilers and coal is still the main form of power generation. The boiler will produce a large amount of water pollution during operation. The Eighth Amendment "Environmental Protection Law of the People's Republic of China" will come into force on January 1, 2015, putting forward higher requirements on water pollution in power industry. How to prevent and control boiler wastewater pollution is an important issue in the current environmental protection of the power industry.

2015 is the first year after the implementation of the new "Environmental Protection Law". Under the new normal economic growth shift, environmental protection has once again become the "strong voice" of the two sessions. Li Keqiang, premier of the State Council, stressed in his 2015 government work report that we must lay the groundwork for environmental governance. According to the government work report, in the prevention and control of pollution, it is necessary to promote the ultra low emission reform of coal-fired power plants and implement the water pollution prevention and control action plan. For the power industry, the goal of 2015 will inevitably be to organize and carry out the operation and management of enterprises around the center of environmental protection.
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First, the boiler waste water hazards
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Power generation boilers generate large amounts of wastewater during the operation of the boilers, which can cause harm to the boilers themselves and cause environmental pollution.
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(1) Hazard to the boiler itself. Sewage will form scale, but also have other phenomena such as corrosion, such phenomena will lead to the boiler in the process of relatively waste of fuel and reduce boiler output and other circumstances may cause damage to metal components and water level can not see clearly Water level and unsafe water transport accidents, which have a very big impact on the safe operation of the boiler and energy consumption. (2) the harm to the environment. In the working state, the boiler will discharge a large amount of sewage. If no corresponding measures are taken, it will pollute the groundwater and rivers and other water sources, which will have corresponding impacts on the growth and production of crops. If the long-term In the sewage environment, there will be poisoning and physical decline and other symptoms.
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Second, boiler wastewater pollution prevention and control measures
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For the harm of boiler waste water, we must find out the ways to effectively solve the problem from the source control, for the energy-saving emission reduction and environmental protection will play a good economic benefits and security.
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(1) pot chemical treatment. Pot dosing This method for any pressure and output of the boiler can be used, but the higher pressure boiler in the treatment or to the main outside the pot to the pot plus the drug. However, for low pressure boilers can be directly pot dosing for processing. This treatment is mainly the following ways: ① soda ash treatment ② phosphate treatment ③ full play to deal with the law ④ neutral water treatment ⑤ combined water treatment ⑥ polymer treatment ⑦ 衡 phosphate treatment . There is a great correlation between the dosage of medicament and the water quality of the water source. Usually, it is necessary to determine the water quality effectively before adding the medicament, and then add the corresponding medicament to make the boiler water ph value reach the national standard. (2) outside the pot chemical treatment. Because each boiler model and the quality of the water are different, the chemical treatment outside the boiler here is mainly directed to the newly put into operation before the boiler and the old chemical descaling, the boiler is in good condition Working status. In the raw water into the boiler before the water treatment equipment for water demineralization, softening, removal of large particles of impurities and other harmful substances in treatment, so that the water supply in line with national standards. Often used sodium ion exchange softened water equipment, ion exchange desalination equipment and other processes. (3) Wastewater treatment. Mainly for the effluent discharged from the boiler for effective treatment, making it possible to meet the national environmental standards, to be re-used in the later stage, the main method adopted at this stage in our country is through the precipitation plus the fear of ceramic filter plate processing. Microporous ceramic filter board is a certain amount of binder, pore-forming agent and rare earth resisting agent mixed with aggregate. After sintering at high temperature, a large number of bridge-shaped open micropores are formed in the ceramic plate with uniform size and interconnection aisle. The use of this treatment before the treatment of wastewater, the need to discharge high concentrations of sediment into the advection sedimentation tank will most of the particles in the precipitation, the general settlement time of 1 ~ 4h, to be done after the completion of the next step.
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Third, the boiler wastewater recycling
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Because of the different types of boilers, the cycle of effluent discharge varies. In this regard, we can effectively be divided into two types of continuous discharge and regular discharge, the following is the author of this analysis:
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(1) continuous discharge of sewage utilization. Continuous discharge is the boiler steam and hot water for effective discharge, recycling of such sewage again, you can effectively heat the soft water inside the furnace, you can also raise the temperature of the feed water within the furnace, if the row of the If the temperature of the sewage water is relatively high, it can also be provided to the scrubber plant for use. In the cold winter, the radiator can also be connected for effective heating.
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(2) regular discharge of sewage utilization. The sewage here refers to the regular discharge of pollutants from the boiler water circulatory system, the size of its emissions to determine the need to determine the raw water hardness and alkalinity. After such effluents are effectively treated, they can once again be used as backwater of boilers to be recycled in a real sense. Sedimentation can also be carried out to flush the ground and hydraulic slag with these water resources.
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(3) Utilization of hydraulic slag removal wastewater. Coal-fired boilers used in water pollution dregs discharged by the polluting water, its larger emissions, this type of sewage after precipitation, decontamination once again become the boiler after the water cycle, so as to achieve a true sense of recycling.