Ultralow boiler smoke emission device

Abstract

The invention discloses an ultralow boiler smoke emission device. The ultralow boiler smoke emission device comprises a coal fired boiler, a denitration reactor, a bag type dust remover and a desulfuration tower. The coal fired boiler comprises a hearth, a main combustor and a flue. The main combustor is arranged at the lower portion of the hearth. Two layers of over fire air spraying ports are formed in the upper portion of the hearth. A smoke guide-out pipeline and a smoke guide-in pipeline are arranged between a previous-level economizer and a previous-level air pre-heater in the flue and are connected with an inlet and an outlet of the denitration reactor correspondingly, and an outlet of the flue is sequentially connected with the bag type dust remover and the desulfuration tower. The desulfuration tower is internally provided with a washing section, an absorption section and a mist removing section from bottom to top. Two water washing spraying layers are arranged above the absorption section, and a PP filler layer is arranged between the upper water washing spraying layer and the lower water washing spraying layer. The mist removing section is sequentially provided with a pipe type mist remover and a ridge mist remover from bottom to top. By means of the ultralow boiler smoke emission device, the content of NOX, SO2 and soot in the boiler smoke can be reduced, the national ultralow emission standard is met, and long-period running target of the device is achieved.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a boiler flue gas ultra-low emission device. Background technique [0002] Most of the smog comes from industrial carbon emissions, among which the flue gas emissions from boilers are the main cause of air pollution. As people's living standards are getting higher and higher, the country's environmental governance is becoming increasingly stringent, requiring coal-fired units to meet ultra-low emission standards (NO X <50mg / m³, SO 2 <35mg / m³, dust content <10mg / m³). [0003] At present, the smoke and dust in the flue gas are mainly removed by dust collectors. More advanced dust removal methods include electric dust removal, bag dust removal and electric bag dust removal. The power consumption of electrostatic precipitator is large, the electrode is easy to be grounded, the failure rate is high, it cannot be operated for a long period, and the dust remova...

AI Technical Summary

Problems solved by technology

The limestone-gypsum method was developed earlier, but the investment and operating costs are relatively high, which is difficult for enterprises to bear

Ammonia desulfurization has the advantages of small footprint, low investment, no increase in carbon emissions, no waste water and waste residue, suitable for various coal types, high utilization value of by-product ammonium sulfate, and obvious economic benefits, but the desulfurization efficiency cannot reach Ultra-low standards, the formation of aerosols lead to the disadvantage of increasing flue gas particulate matter at the desulfurization outlet

[0006] In summary, the current denitrification, dust removal, and desulfurization technologies for flue gas alone cannot meet the ultra-low emission standards stipulated by the state, and it is imminent to design new boiler flue gas purification equipment

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