Dust removal, desulfurization, denitrification and purification system and process for flue gas of lime kiln

Abstract

The invention relates to a dust removal, desulfurization, denitrification and purification system and process. The system comprises a cyclone desulfurization tower, a dust remover, a denitrification reactor, an induced draft fan, an ammonia gas dilution fan, a mixer and a chimney, wherein the cyclone desulfurization tower body adopts a cyclone structure, and a plurality of atomizing spray guns are arranged at the top of the cyclone desulfurization tower body; a flue gas inlet of the cyclone desulfurization tower is connected with a flue gas outlet of the lime kiln, and a flue gas outlet of the cyclone desulfurization tower is connected with a dusty flue gas inlet of the dust remover; a flue gas outlet of the dust remover is sequentially connected with the denitration reactor, the induced draft fan and the chimney; and an outlet of the induced draft fan is additionally connected with an ammonia gas inlet of the denitration reactor, an ammonia gas dilution fan and a mixer are arranged on an ammonia gas inlet pipeline, and the mixer is additionally connected with an external supply ammonia gas pipeline. According to the invention, the flue gas of the lime kiln is subjected to dust removal, desulfurization, denitrification and purification treatment and then is discharged after reaching the standard; and the discharged flue gas can reach national industrial furnace pollutant discharge standards, so the atmospheric pollution is effectively reduced, and the clean production of the refractory lime industry is favorably realized.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a lime kiln flue gas dust removal, desulfurization and denitrification purification system and process. Background technique [0002] Calcined quicklime has a long history in my country. During the lime firing process, a large amount of flue gas to be treated is produced. The temperature of the flue gas is about 180°C. The main components of the flue gas are dust, acid gas, NOx and other harmful gases. CaO / Ca in the dust (OH) 2 Although the content is relatively high, the actual production and operation process proves that only through the CaO / Ca(OH) in the flue gas 2 The effect of removing acid gas is not obvious, and SO 2 Such acid gases are still exceeding the standard, which has brought serious harm to the environment. [0003] At the same time, as the country’s emission standards for industrial smoke and dust are becoming increasingly stringent, and industria...

AI Technical Summary

Problems solved by technology

[0002] Calcined quicklime has a long history in my country. During the lime firing process, a large amount of flue gas to be treated is produced. The temperature of the flue gas is about 180°C. The main components of the flue gas are dust, acid gas, NOx and other harmful gases. CaO / Ca in the dust (OH) 2 Although the content is relatively high, the actual production and operation process proves that only through the CaO / Ca(OH) in the flue gas 2 The effect of removing acid gas is not obvious, and SO 2 and other acid gases still exceed the standard, which has brought serious harm to the environment

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