A biomass fluidized bed direct combustion system and denitrification method thereof

Abstract

The invention belongs to the field of biomass fluidized bed combustion, and specifically discloses a biomass fluidized bed direct combustion system and a denitrification method thereof, which includes a biomass fluidized bed boiler, a cyclone separator, a feeding reactor, and a waste heat boiler , flue gas purification device and air distribution device, the lower end of the biomass fluidized bed boiler is provided with a first feeder and slag discharge pipe, and the upper side is provided with a denitrification device; the cyclone separator is arranged at the upper end of the biomass fluidized bed boiler, and It is connected with the feeding reactor; the upper end of the feeding reactor is provided with an exhaust pipe, and the lower end is provided with a feeding pipe. Both the exhaust pipe and the feeding pipe are connected with the biomass fluidized bed boiler, and the feeding reactor is also provided with The second feeder; one end of the waste heat boiler is connected to the cyclone separator, and the other end is connected to the flue gas purification device; the air distribution device is used to supply air to the biomass fluidized bed boiler. The invention optimizes the problem of low denitrification efficiency in the traditional biomass combustion boiler, has high denitrification efficiency, and reduces operating costs at the same time.

Description

technical field [0001] The invention belongs to the field of biomass fluidized bed combustion, and more specifically relates to a biomass fluidized bed direct combustion system and a denitrification method thereof. Background technique [0002] In recent years, due to its abundant reserves, low pollution and renewable characteristics, biomass energy has gradually become a research and utilization hotspot. Biomass direct combustion power generation technology has significant advantages such as good fuel adaptability, large production scale, high conversion efficiency, and low pollution emissions. It is the main way to use biomass energy on a large scale at home and abroad. Especially when the quality of biomass fuel fluctuates greatly and the water content is high, and other biomass energy conversion and utilization technologies are difficult to implement, direct combustion utilization has great advantages. [0003] The projects currently included in the catalog of biomass d...

AI Technical Summary

Problems solved by technology

The two most mainstream technologies in the denitrification process are selective catalytic reduction (SCR) and non-selective catalytic reduction (SNCR). The use of SCR on material boilers is likely to cause catalyst poisoning or even failure, and the reducing agent will cause problems such as corrosion and blockage of the heating surface at the tail, which cannot achieve its economic benefits

Although the use of non-selective catalytic reduction denitrification (SNCR) is relatively low in cost, it has strict requirements on the temperature window. Furnace temperature fluctuations will cause low denitrification efficiency and cannot meet the ultra-clean emission requirements of nitrogen oxides (the nitrogen oxide content is required to be less than 50mg / N m 3 )

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