Ammonia nitrogen recovery device and method for resin regeneration wastewater of fine treatment system in power plant

Abstract

The invention provides an ammonia nitrogen recovery device and method for resin regeneration wastewater of a fine treatment system in a power plant. The device comprises a refined treatment regenerated wastewater storage tank, a multi-medium filter, a reverse osmosis high-pressure pump, a security filter, a reverse osmosis membrane, a refined treatment resin regenerated wastewater concentrated solution storage tank, an alkali liquor storage tank, a mixing tank, a first heat exchanger, a first degassing membrane assembly, an intermediate ammonia water tank, a second heat exchanger, a second degassing membrane assembly, a product ammonia water tank, a deep deamination box for refined treatment resin regenerated wastewater, and a third degassing membrane assembly. According to the device, ammonia nitrogen in the resin regeneration wastewater of the fine treatment system in the power plant is removed by utilizing a membrane-process deamination technology, and meanwhile, the problem that the quality of prepared ammonia water becomes poor due to the fact that water vapor carries inorganic salt ions in the wastewater under the action of osmotic pressure to penetrate through degassing membranes to reach absorption liquid in a deamination process is solved, the high-purity ammonia water which can be directly used for regulating the pH value of boiler water is prepared, the cyclic utilization of ammonia resources is realized, and the pressure of wastewater treatment of the power plant is reduced.

Description

technical field [0001] The invention relates to the technical field of high ammonia nitrogen industrial wastewater treatment technology, in particular to an ammonia nitrogen recovery device and method for resin regeneration wastewater in a power plant finishing treatment system. Background technique [0002] For large-scale thermal power plants, in order to avoid corrosion of the thermal system, ammonia is usually added to the water supply system as an alkalizing agent to control the pH of the water supply within the range of 9.2 to 9.6. At the same time, in order to maintain the water vapor quality of the thermal system, the thermal power plant is also equipped with a condensate polishing system, which uses ion exchange resins to remove corrosion products and various dissolved salt impurities in the condensate formed after work in the steam turbine, ensuring Water vapor quality in thermal systems. [0003] Under the normal operation of thermal power system and condensate f...

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Problems solved by technology

Among them, the chemical precipitation method and the breakpoint chlorine addition method consume a large amount of chemicals, have high costs, and are prone to secondary pollution; the biological denitrification method has a long treatment process, and microbial activity is easily affected by factors such as water quality, water temperature, and toxic substances. In addition, the fine treatment of recycled wastewater itself has the characteristics of large fluctuations in water quality, which makes it difficult to control the parameters of the biological denitrification process; the stripping method consumes a lot of power, is poor in economy, and the residual ammonia nitrogen content in the produced water is relatively high

[0005] Some power plants use purchased ammonia water or liquid ammonia as the ammonia source to adjust the pH of the furnace water. However, when liquid ammonia is used as the ammonia source, the quality of the purchased ammonia water cannot be effectively monitored. The introduction of the system leads to the problem of poor water vapor quality. At the same time, the unavoidable irritating ammonia smell in the dispensing process also increases the workload of the power plant personnel and poses a certain threat to the health of the staff; and liquid ammonia belongs to Class B fire hazards Sexual substances, NH produced when liquid ammonia leaks 3 Mixing with air can form an explosive mixture, which can cause explosive combustion when exposed to open flames and high heat. At the same time, inhalation of high-concentration ammonia can cause chemical pneumonia and burns. Therefore, when liquid ammonia is used as the source of ammonia, after production accidents such as leakage and explosion extremely harmful

Therefore, whether liquid ammonia or ammonia water is used as the ammonia source for adding ammonia to the boiler water, there are certain disadvantages.

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