Constant-density biomass gasifier

Abstract

The invention provides a constant-density biomass gasifier which comprises a gasifier body, a movable gasifier cover and a self-rotating nozzle, a material pressing mechanism is arranged on the movable gasifier cover and comprises a driving device and a material pressing disc, and the material pressing disc is used for providing downward constant pressure for biomass fuel in the gasifier body under the driving of the driving device; therefore, through the material pressing mechanism arranged on the movable furnace cover, a continuous pressure from top to bottom or an intermittent impact striking effect is exerted on the biomass fuel in the material storage area in the furnace, so that a fuel layer stably descends, the compactness of the material layer is improved, and the bridging phenomenon of the material layer is eliminated; meanwhile, by means of the self-rotating nozzle, a gasifying agent evenly enters the reaction area from the center direction, an oxidation layer and a reduction layer are stable and balanced, and the burn-through phenomenon is eliminated; besides, except for filling the biomass raw materials and discharging the biochar, other operation processes are easy to realize automatic control, so that the operation cost is greatly reduced, and the economic applicability is better.

Description

technical field [0001] The invention belongs to the technical field of biomass gasification furnaces, in particular to a constant density biomass gasification furnace. Background technique [0002] As we all know, biomass is a sustainable green resource, and it is a reliable resource acquisition channel for my country's energy structure transformation, air pollution control, and CO2 emission reduction. However, due to scattered biomass resources, low bulk density, and difficulties in collection and transportation, most of the biomass has not been properly used. At present, in our country, agriculture randomly burns or discards straw, excessive and inefficient use of chemical fertilizers, all of which have caused serious environmental pollution and consumed a lot of energy of local governments. To completely solve the above problems, there is an urgent need for a large-scale high-value biomass treatment technology-biomass gasification technology. [0003] Biomass gasificati...

AI Technical Summary

Problems solved by technology

However, in the actual operation of the existing downdraft gasifier type, the biomass material layer does not have an appropriate downward driving force, and the air distribution port of the gasification agent is directional, which may easily cause irregular shapes of the oxide layer and the reduction layer of the furnace body section. , the material layer moves down inconsistently

In addition, the fuel accumulation is bound by the accumulation angle, which makes the fuel in the furnace prone to bridging and burning through, which affects the efficiency of the thermochemical reaction in the furnace, and it is easy to cause local overheating (flying temperature) of the bed layer, so the existing gasifier type is suitable The fuel is limited to those with high bulk density, small particle size, and small stacking angle, which severely limits the selection of raw materials and increases the operating cost of biomass gasification

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