SCR (Selective Catalytic Reduction) flue gas denitrification system

Abstract

The invention discloses an SCR (Selective Catalytic Reduction) flue gas denitrification system which comprises an industrial boiler, an air pre-heater, an SCR reactor, a liquid ammonia tank, an electric precipitator, a draught fan and a spraying device, wherein an air inlet and a flue gas discharging port are formed in the industrial boiler; the air pre-heater is connected with the air inlet; a gas outlet and a gas inlet connected with the flue gas discharging port are formed in the SCR reactor; the liquid ammonia tank successively passes through a vaporizer, an ammonia buffer tank and a mixer and then is connected with the gas inlet of the SCR reactor, and an air dilution fan is connected with the mixer; the electric precipitator passes through the air pre-heater and then is connected with the gas outlet; one end of the draught fan is connected with the electric precipitator while the other end is connected with a chimney; and the spraying device is located above the liquid ammonia tank, the vaporizer and the ammonia buffer tank and is used for absorbing ammonia from air. The SCR flue gas denitrification system has the advantages and effects that the SCR reactor can remove oxynitride; when the spraying device is used for reducing the temperature, the water resource is recycled; and the solution, which is generated after ammonia is removed by the spraying device, also can be neutralized with dilute sulphuric acid, and finally, an ammonia fertilizer can be acquired.

Description

technical field [0001] The invention relates to a polluted gas treatment process, in particular to an SCR flue gas denitrification system. Background technique [0002] Flue gas is a mixture of gas and smoke, which is the main cause of air pollution. The composition of flue gas is very complex. The gas includes not only water vapor, sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrocarbons, nitrogen oxides, etc., but also dust, coal particles, oil droplets, etc. [0003] At present, the authorized announcement number is CN205505042U, and the authorized announcement date is August 24, 2016. The Chinese patent discloses an integrated equipment for industrial flue gas desulfurization, denitrification and dust removal, including industrial boilers. The inlet, the flue gas discharge port is connected to the air inlet of the SCR reactor, and the air inlet of the SCR reactor is also connected to the mixer, which is respectively connected to the dilution air i...

AI Technical Summary

Problems solved by technology

[0004] This kind of industrial flue gas desulfurization, denitrification and dust removal integrated equipment is in use, if there is ammonia leakage, and this integrated equipment does not have emergency treatment for ammonia leakage, it is easy to cause harm to human life

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