Novel SCR denitrification system for preventing gypsum rain

Abstract

The invention discloses a novel SCR denitrification system for preventing gypsum rain. The novel SCR denitrification system is characterized in that a rotary type heat exchanger and a heat pipe type heat exchanger are arranged between a desulfurization tower and the SCR denitrification system along the tail flue gas flow, so that flue gas at an outlet of an air pre-heater sequentially flows through a dust remover, the desulfurization tower, a cooler, the heat absorbing end of the rotary type heat exchanger, the heat absorbing end of the heat pipe type heat exchanger, an SCR reactor and the heat release end of the rotary type heat exchanger and then is emptied. High-temperature furnace flue gas is extracted from a furnace and is sent to the heat release end of the heat pipe type heat exchanger; and after heat release, the flue gas is returned to the furnace for circulation. Low-temperature flue gas from the desulfurization tower is heated by the heat absorbing end of the rotary type heat exchanger and the heat absorbing end of the heat pipe type heat exchanger to reach a catalyst reaction temperature window. Compared with a traditional SCR denitrification technology, the novel SCR denitrification system disclosed by the invention has the benefits that the influence of fly ash, ammonium salt and the like on a catalyst is avoided, the activity of the catalyst is ensured, the exhaust temperature of the flue gas can also be controlled through the heat release end of the rotary type heat exchanger, and the problem of the gypsum rain is solved.

Description

technical field [0001] The invention relates to a flue gas denitrification system, in particular to a novel SCR denitrification system for preventing gypsum rain, and belongs to the technical field of post-treatment of boiler flue gas. Background technique [0002] With the rapid development of my country's industrialization, environmental issues have become the focus of attention. In recent years, nitrogen oxides NO x As the main source of air pollution, photochemical pollution, and acid rain, its treatment has become the focus of people's attention and research. [0003] NO produced during the operation of current coal-fired power plants x It is one of the main sources of nitrogen oxides. In December 2015, the executive meeting of the State Council decided to fully implement ultra-low emissions for coal-fired power plants before 2020, reducing NO x The emission concentration is limited to 50mg / m 3 under. [0004] At present, the ammonia-based SCR denitrification tech...

AI Technical Summary

Problems solved by technology

However, there are a series of problems in the operation of SCR denitrification technology, such as air preheater blockage and catalyst poisoning, so reducing or eliminating the adverse effects of SCR devices has become a top priority

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