Fluidized bed gasifier suitable for various biomass raw materials

Abstract

The invention discloses a fluidized bed gasifier suitable for various biomass raw materials. The fluidized bed gasifier comprises a wind box and a furnace, wherein a wind distribution plate and a windcap are arranged at the connecting position between the wind box and the furnace in sequence; the bottom of the furnace is of a reducing structure, a uniform speed hole plate is arranged above the reducing structure, and the open hole area of the uniform speed hole plate occupies 65%-95% of the cross sectional area of the furnace; open holes of the uniform speed hole plate are distributed outwards from the center of the furnace. By arranging the uniform speed hole plate above the reducing structure, after biomass gas passes the reducing structure, a generated speed wave peak is removed, equilibrium flow velocity increases the reduction reaction time of fuel gas, and the quality of the fuel gas is improved; through a slag falling pipe and a traverse baffle, the traverse baffle is arrangedabove the uniform speed hole plate, so that the biomass gas is subjected to solid separation, biomass ash returns to the lower part of the furnace through a gap formed between the traverse baffle andan furnace inner wall to form an internal circulation, and thus operating pressure of a lower separating device is reduced and the percent conversion of carbon is improved.

Description

technical field [0001] The invention relates to a gasification furnace, in particular to a fluidized bed gasification furnace suitable for various biomass raw materials. Background technique [0002] my country is very rich in biomass resources. The total amount of biomass resources that can be used as energy is about 460 million tons (standard coal) per year, but the current utilization is only about 35 million tons (standard coal) per year, and the utilization rate is only 7.6 %, there is still room for improvement. Biomass power generation is an important way to efficiently utilize biomass. It can realize the scale, resource, energy and clean utilization of biomass at the same time. It is an industrial development direction encouraged by national policies. [0003] At present, domestic biomass fluidized bed gasifiers are not very adaptable to fuels, and can only process single biomass fuels, such as rice husks, shaped biomass particles, or mixed combustion of rice husks a...

AI Technical Summary

Problems solved by technology

[0004] 1) The oxygen consumption, density, and volume of biomass combustion vary greatly, and the critical fluidization velocity is low. In the case of constant air volume and furnace cross-section, it is easy to cause channeling, stratification and local non-fluidization;

[0005] 2) If the bottom of the furnace is narrowed to increase the fluidization velocity, the flue gas will form a wave peak in the amplification section, thereby increasing the combustion area, resulting in reduced reduction reaction time and reduced gas quality;

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