Biomass pyrolysis reburning and SNCR denitration system and method thereof

Abstract

The invention relates to a biomass pyrolysis reburning and SNCR denitration system and a method thereof. The system comprises a biomass pyrolysis system, an amino reducing agent supply system and a two-stage SNCR denitration device which are connected to a boiler, the two-stage SNCR denitration device comprises a first-stage SNCR denitration reactor and a second-stage SNCR denitration reactor; the boiler is sequentially provided with a low-nitrogen combustor located in a main combustion area, a biomass pyrolysis gas nozzle located in a re-combustion area, an SOFA air nozzle located in a burnout area and a first-stage SNCR denitration reactor from bottom to top; a platen superheater, a second-stage SNCR denitration reactor and a high-temperature superheater are sequentially arranged at a horizontal flue of the hearth; a solid-phase outlet of the biomass pyrolysis system is connected with a low-nitrogen combustor, and a gas-phase outlet of the biomass pyrolysis system is connected with a biomass pyrolysis gas nozzle; and the output end of the amino reducing agent supply system is respectively connected with amino reducing agent spray guns of the first-stage SNCR denitration reactor and the second-stage SNCR denitration reactor. The method is reasonable in design, simple, efficient, stable and feasible.

Description

technical field [0001] The invention relates to a flue gas denitrification technology of a thermal power plant, in particular to a biomass pyrolysis and reburning cooperative SNCR denitrification system and a method thereof. Background technique [0002] Nitrogen oxides are one of the main sources of air pollution in coal-fired power plants, and their massive emissions can cause environmental problems such as acid rain and photochemical smog. At present, the NOx emission reduction technologies commonly used in coal-fired power plants include low-air staged combustion, partial reburning, non-selective catalytic reduction (SNCR) and selective catalytic reduction (SCR), etc. The combination or combination of different denitrification processes will be an important development direction of denitrification technology. Innovating the denitrification mechanism and developing multi-stage composite denitrification processes are becoming the development direction. [0003] Partial re...

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Problems solved by technology

[0005] Biomass high temperature pyrolysis can produce CHi, H 2 , CO and other reducing gases and coke. In the prior art, biomass reburning is often used to reduce nitrogen oxides in the furnace, but the pyrolytic charcoal and mixed flue gas generated during the biomass pyrolysis process have not been controlled in different areas inside the furnace. Classified treatment, resulting in the problem of low denitrification efficiency inside the furnace

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