Flue gas denitrification system

Abstract

The invention discloses a flue gas denitrification system. The flue gas denitrification system comprises a boiler hearth, a pyrolysis mechanism, an SCR reactor, a pipeline system and an exhausting pressurizing mechanism, wherein the pyrolysis mechanism, the SCR reactor and the pipeline system are located outside the boiler hearth; one end of a flue gas pipeline is communicated to the boiler hearth, and the other end of the flue gas pipeline is communicated to a pyrolysis mechanism; one end of a hearth flue is communicated to the boiler hearth, and the other end of the hearth flue is communicated to the SCR reactor; an air outlet pipeline is communicated to a hearth flue through the flue gas pipeline; and the exhausting pressurizing mechanism is connected between the pyrolysis mechanism andthe SCR reactor and is communicated to the air outlet pipeline. The exhausting pressurizing mechanism is arranged at the lower end of the pyrolysis mechanism, and pressurized high-temperature flue gas is introduced into the SCR reactor, so that the flue gas denitrification is realized; and compared with the prior art, the flue gas denitrification system has the advantages that the defect of an over-high temperature of the exhausting pressurizing mechanism is improved, and the service life of the system is not influenced.

Description

【Technical field】 [0001] The invention relates to a flue gas denitration system for a coal-fired power plant, in particular to a pyrolysis and reaction flue gas denitrification system. 【Background technique】 [0002] Nitrogen oxides (NOx) in the flue gas of coal-fired power plants are one of the main air pollutants. At present, the selective catalytic reduction technology (SCR) is mainly used to control the emission of nitrogen oxides in the flue gas, that is, the use of reducing agents to selectively It reacts positively with the nitrogen oxides in the flue gas and generates non-toxic and pollution-free nitrogen (N 2 ) and water (H 2 O), to achieve the purpose of denitrification and environmental protection. The commonly used reducing agents in the denitrification system are liquid ammonia, ammonia water and urea solution. Urea is selected as the reducing agent, which has the characteristics of high safety, wide range of sources, easy transportation and storage, and has b...

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Problems solved by technology

[0003] Please refer to the Chinese Utility Model Patent No. 201520986907.x published on May 11, 2016, which discloses a flue gas denitrification system, which includes a boiler, a pyrolysis furnace, and an SCR reactor. The flue gas pipe connects the boiler to the The pyrolysis furnaces are connected together, and a booster system is installed on the flue gas pipeline to transport the high-temperature flue gas in the boiler to the pyrolysis furnace. Due to the high temperature of the boiler flue gas, the requirements for the booster system are very high. As a result, the manufacturing cost and technical difficulty of the supercharging system are increased, and the operating cost of the flue gas denitrification system is increased, and the supercharging system is kept running at high temperature, which affects the service life of the supercharging system

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