High-temperature and high-alkali flue gas ultra-clean treatment system

Abstract

The invention discloses a high-temperature and high-alkali flue gas ultra-clean treatment system. Flue gas sequentially passes through a flue gas conditioning system, a powder-flue gas static mixer, a high-temperature electric dust remover, an ammonia water spraying device, an SCR reactor, an MGGH system high-temperature section, a waste heat boiler, an induced draft fan, a wet desulphurization device, a wet electric dust remover, an MGGH system low-temperature section and a chimney. The MGGH system comprises a low-temperature section and a high-temperature section which are connected through a circulating pipeline. The problem that the specific resistance of dust in high-temperature and high-alkali flue gas is too low is solved, and through the MGGH system, 'gypsum rain 'of a chimney is avoided, 'smoke plume' visual pollution is eliminated, and the ultra-clean emission requirement is met. The system is efficient in treatment, low in investment cost and stable and reliable in operation.

Description

technical field [0001] The invention relates to an ultra-clean treatment system for high-temperature and high-alkali flue gas. Background technique [0002] Due to the influence of boiler fuel and combustion batch materials, the high-temperature and high-alkali flue gas has complex flue gas components, and the flue gas dust has strong corrosion and adhesion, which affects the subsequent denitrification and dust removal efficiency. [0003] The flue gas ultra-clean treatment technology is to treat the flue gas by adopting an effective flue gas treatment process, so that the flue gas discharged from the chimney can meet the ultra-clean emission standard. which requires SO 2 , NO x , The particle emission concentration is not higher than 35mg / m 3 , 50mg / m 3 , 5mg / m 3 . [0004] There are many comprehensive flue gas treatment processes currently used in high-temperature and high-alkali flue gas. In order to meet the requirements of ultra-clean emission of flue gas, dust r...

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Problems solved by technology

[0005] In order to overcome the defects existing in the prior art, in order to reduce the adhesion of dust, and to avoid the generation of gypsum rain, the present invention provides an ultra-clean treatment system for high-temperature and high-alkali flue gas. The dust viscosity of alkali flue gas increases the specific resistance, reduces the emission of flue gas particles and NOx pollutants, and achieves the purpose of efficient dust removal and denitrification; on the other hand, the MGGH system is added to heat up the flue gas at the outlet of the desulfurization tower through flue gas heat exchange. Reduce the amount of mist carried by the flue gas at the chimney outlet, and eliminate the phenomenon of white smoke and gypsum rain

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