In recent years, ultra-low-emission reconstruction process, a variety of technical schools have been born, and to promote the use of power generation enterprises to achieve ultra-low power generation units to help boost emissions. These distinctive technical process, so that thermal power enterprises in the environmental transformation can have a variety of options. Individual technology is maturing To meet the relevant requirements of ultra-low emissions, it is necessary to meet the indicator requirements in terms of soot, sulfur dioxide and nitrogen oxide emission concentration. As thermal power enterprises attach more importance to environmental protection issues, the environmental protection market is increasingly active. Many environmental protection enterprises have increased their investment, developed new technologies and developed new processes. For different emission control requirements, some in line with the status quo of China's thermal power industry has been continuously applied environmental technology and matures. In the denitrification reform, there are mainly two major ways to retrofit low-nitrogen burners and increase the spare layer for the denitration catalyst. Through the application of these two denitrification technologies, many thermal power enterprises have achieved good transformation results. Relative to the denitrification, desulfurization transformation of the technical route is more abundant. Including single-tower integrated desulfurization and dust removal technology, single-tower dual-zone high-efficiency desulfurization and dust removal technology, dual-tray technology, high gradient graded composite desulfurization tower technology, double towers double loop technology and many other technology processes. Some of these technologies are independently developed in China, and some are imported from abroad, each with its own advantages and disadvantages. Among these technologies, the single tower integrated desulfurization and dust removal depth purification technology is a proprietary technology developed independently in our country. The technology can simultaneously achieve sulfur dioxide concentration not exceeding 35 mg / standard cubic meter and dust content not exceeding 5 mg in an absorption tower / Standard cubic meters, desulfurization efficiency of 99% or more, dust removal efficiency up to 90%. Single-tower double-zone high-efficiency desulfurization and dust removal technology and double-tower double-circulation technology belong to the same type of different desulfurization two desulfurization methods, graded efficient graded composite desulfurization tower technology makes ultra-low coal technology has a wide adaptability. And desulfurization transformation of the same technology, dust removal technology also has a variety of technical processes. At present, the thermal power companies use more technology, including low temperature electric dust removal, wet electric dust removal, electric bag composite dust removal, tube bundle dust removal and other technology. Among them, the electric bag composite dust is the organic combination of electrostatic precipitator and bag dust removal features, composite dust collector with high efficiency and stability advantages, at present in the domestic thermal power units, especially small and medium-sized units more. Due to the low cost and the obvious effect, the transformation of high-frequency electric dust remover has become a commonly used auxiliary dust remodeling and efficiency retrofit method in many ultra-low emission retrofits. Low-temperature electric dust removal is to add a heat recovery device before the electric dust removal to reduce the inlet temperature of the dust collector, and to make use of the characteristic that the volume flow rate of the flue gas becomes smaller as the temperature decreases and the specific resistance of the dust decreases as the temperature decreases. Tube-type dust removal is mainly used for ultra-low dust, it is the use of flue gas in the centrifugal tube bundle rapid rotation of the formation of centrifugal force and gravity to achieve efficient dust removal and defogging. After the droplets form a liquid film under the action of centrifugal force and capture the dust particles, both of them are removed from the inner wall of the centrifugal tube bundle under the action of gravity so as to achieve the dual effect of dust removal and mist removal. Because of its use of flue gas flow rate without additional energy consumption, it can achieve the purpose of energy efficient. Combination technology reveals more advantages In the continuous application of various technologies, in order to further improve the emission reduction effect, and gradually adapt to the country's higher requirements for thermal power enterprises emissions, after the above single emission reduction technology route matures, the use of combination routes for ultra-low emissions reform is increasingly subject to thermal power Business of all ages. At present, there are many kinds of combined technology routes, including integration of desulfurization and dust removal, denitrification catalyst plus layer and high frequency power transformation, integration of desulfurization and dust removal, denitrification catalyst plus layer and high frequency power transformation, MGGH, integration of desulfurization and dust removal, Catalyst plus layer + high frequency power transformation + wet electric dust and many other different combinations. In these combined routes, both are considered to be cost-effective, cost-effective, but also relatively small investment. Among them, the integration of desulphurization dust + denitrification catalyst + high-frequency power supply layer transformation, according to the current calculation of single investment 50 million yuan to 100 million yuan between the downtime can be controlled within 60 days, this combination is considered to be current More economical technology route. In addition, there is a centralized combination of the industry considered to be more cost-effective. Desulfurization dust integration + denitrification catalyst plus layer + high frequency power transformation + MGGH, desulfurization dust integration + denitrification catalyst plus layer + high frequency power transformation + wet electric dust removal, single tower dual-zone desulfurization and dedusting technology + denitrification catalyst plus layer + high Frequency power transformation + MGGH, single-tower dual-zone desulfurization and dedusting technology + denitrification catalyst plus + high-frequency power transformation + wet electric dust combination, some thermal power enterprises have achieved good emission reduction after use. Several combinations of these routes, a single unit investment in the basic 100 million to 150 million yuan between the construction period of 60 to 80 days. In general, the new unit should give priority to the combination of technology, technical transformation unit due to the existing environmental protection facilities and power plant site conditions are limited, should find the most suitable solution for the program.
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