A co-combustion device for biomass and coal circulating fluidized bed controlled by jet flow

Abstract

A biomass and coal composite burner is composed of a fluidized bed (7), a biomass jet inlet pipe (2), an oxygen-rich air inlet (3), a gas distributor (4), a feed coal inlet (5), a fluidized bed heat conduction pipe (6), a heat exchanger (9), a heat exchanger heat conduction pipe (10), a cyclone separator (8), an ash outlet (1), an oxygen-poor air outlet (11) and an ash discharge outlet (12), and is characterized in that the bottom of the fluidized bed (7) is equipped with the ash outlet (1), the jet inlet pipe (2) and the gas distributor (4), the lower portion is equipped with the heat conduction pipe (6), the side surface is provided with the feed coal inlet (5), and the upper portion is equipped with the cyclone separator (8); the bottom of the heat exchanger (9) is provided with the ash discharge outlet (12), the lower portion is equipped with the oxygen-poor air outlet (11), and the heat conduction pipe (10) is disposed inside heat exchanger. After biomass is transferred by oxygen-rich air into the fluidized bed (7), biomass and coal are rapidly mixed under the action of jet and then combust, thus greatly minimizing the generation of biomass tar.

Description

technical field [0001] The invention relates to a combustion device of solid fuel, in particular to a co-combustion device of biomass and coal circulating fluidized bed controlled by jet flow. Background technique [0002] Biomass has great compatibility with traditional fossil fuels such as coal and oil. It is not only easy to connect with the existing energy industry in terms of power generation and heat supply utilization, but also is the only renewable resource that can be directly converted into carbon-containing fuels. In December 2009, the International Energy Agency pointed out in a report on biomass energy that currently renewable energy provides 13% of the world's primary energy, while biomass plays a dominant role in renewable energy, accounting for about 10%. Biomass energy accounts for about 3% in developing countries, mainly used for power generation and heat supply; but in developing countries, the average is about 22%, and some countries even reach more than ...

AI Technical Summary

Problems solved by technology

However, compared with European and American countries, domestic biomass resources are relatively scattered, and the supply as a commodity is very limited. Therefore, most of the domestic market applications are small and medium-capacity boilers, and due to the constraints of raw material seasonality and geographical radius, production is forced to It is difficult for enterprises that burn materials alone to maintain normal operation without policy support. Only enterprises that use waste biomass resources such as timber factories and rice mills have their living space

From a technical point of view, the problems of deposition, slagging, and corrosion in the process of biomass combustion have not been well resolved. For the use of fluidized bed combustion boilers, it is necessary to further study the influence of particle flow non-uniformity in the furnace on the combustion and heat transfer process. influence behavior

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