Multi-layer fluidized bed two-stage activated carbon/coke flue gas simultaneous-desulfurization and denitrification system and method

Abstract

The invention relates to the field of industrial flue gas pollution control. A multi-layer fluidized bed two-stage activated carbon / coke flue gas simultaneous-desulfurization and denitrification system of the invention comprises a dust removal device (4) and further comprises a desulfurization and denitrification multi-layer fluidized bed reactor (13), wherein a feed port of the dust removal device (4) is communicated with the top of the desulfurization and denitrification multi-layer fluidized bed reactor (13); the desulfurization and denitrification multi-layer fluidized bed reactor (13) is divided into an upper denitrification section and a lower desulfurization section; the denitrification section comprises several layers of fluidized beds; an ammonia gas injection port (10) is formed in a side wall corresponding to a position below the bottom of each layer of fluidized bed; the desulfurization section comprises several layers of fluidized beds; a flue gas inlet (7) is formed in the side wall corresponding to the position below the bottom of a lowest layer of fluidized bed. The system provided by the invention can enhance the mass transfer and heat transfer, improve the efficiency of desulfurization and denitrification, replace high-cost formed activated carbon / coke with fine granular activated carbon / coke to reduce the costs for desulfurization and denitrification, and is suitable for the flue gas purification of power plant boilers, industrial boilers, heating boilers and coking industry.

Description

technical field [0001] The invention relates to the field of industrial flue gas pollution control, in particular, the invention relates to a multi-layer fluidized bed two-stage activated carbon / coke flue gas simultaneous desulfurization and denitrification system and method. Background technique [0002] Flue gas emitted from fossil fuel combustion and metal smelting processes contains SO x and NO x Environmental problems such as smog, acid rain, and photochemical smog caused by these flue gas pollutants seriously endanger human health and living environment, so they have attracted widespread attention from all over the world. In this context, a variety of flue gas desulfurization and denitrification methods and technologies have emerged. [0003] Activated carbon / coke (referred to as AC) simultaneous desulfurization and denitrification technology uses activated carbon / coke made of coal or biomass as a desulfurization adsorbent and denitrification catalyst to simultaneous...

AI Technical Summary

Problems solved by technology

[0007] To sum up, the current domestic and foreign activated carbon / coke flue gas purification processes are mainly fixed bed and moving bed processes. Among them, the fixed bed process has many shortcomings and is mainly designed for flue gas desulfurization. Small size, parallel connection of equipment causes problems such as large space occupation, discontinuous operation, high pressure drop, frequent switching of adsorption and regeneration; while the disadvantages of the moving bed process are poor mass transfer and heat transfer effects, high pressure drop, serious wear of active coke, and high High-strength shaped activated coke has high cost, which hinders the popularization and application of activated carbon / coke desulfurization and denitrification process

Images