Biomass gasification furnace

Abstract

The invention discloses a biomass gasification furnace. The biomass gasification furnace comprises a gasification furnace body, wherein the gasification furnace body is sequentially provided with an ash tray, a pressurized furnace body, a normal-pressure furnace body and a dry distillation section from bottom to top in a matching manner; a hearth is filled with biomass waste derived fuel (RDF) andsequentially comprises an ash layer, a fixed carbon combustion layer, a gasification layer and a dry distillation layer from bottom to top. A tar pipeline and a feeding pipe are respectively arrangedabove the dry distillation section, namely the top surface of the gasification furnace in a matching manner, one end of the tar pipeline vertically extends into the gasification furnace hearth and isconnected with a thermocouple, and the other end of the tar pipeline leads to a tar pool. The tar generated by RDF gasification is returned to the furnace again to be pyrolyzed and gasified or combusted to be completely utilized, and due to the fact that the tar is completely utilized, the concentration and the heat value of combustible gas can be increased in the working process of the biomass gasification furnace, or the tar is combusted to increase and keep the temperature of the fixed carbon combustion layer. The RDF combustion utilization rate is higher, and economy and environmental protection are achieved.

Description

technical field [0001] The invention relates to a gasifier, in particular to a biomass gasifier. Background technique [0002] Biomass waste includes municipal solid waste, municipal sludge, agricultural and forestry waste, medical waste, industrial organic waste, etc., and its equivalent content is more than 8 times that of the energy used by all human beings. The above wastes are crushed - air separation - magnetic separation - screening - crushed to a certain particle size, and then add biothermal deodorant (the core technology of this additive is to improve the pyrolysis performance of biomass waste), fully It is formed by stirring and pressing into biomass-derived fuel rod RDF (abbreviation of Refuse Derived Fuel). It has the characteristics of no odor, less inorganic content, and ultra-low emission of dioxins after gasification and power generation. [0003] The stable mass production of biomass waste-derived fuel (RDF) has undoubtedly brought vitality to the resourc...

AI Technical Summary

Problems solved by technology

[0006] The tar, fly ash, and phenolic water produced during the biomass gasification process are easy to coke and block the pipeline, and the heavy metals contained in them are harmful substances, which have always been a major headache for gasification and incineration technology

[0007] The existing biomass gasification furnace lacks effective means to return the tar produced in the gasification process of garbage and other biomass wastes to the furnace for regasification; a small part of fly ash and phenol water, The tar is mixed together and it is difficult to separate; the separated phenol water contains heavy metals, which must be softened by chemical means to be reused, which requires a large investment and high cost; the temperature at the center of the fixed carbon combustion layer is relatively high, which is easy to cause excessive combustion and local burn-through , causing the RDF fuel to be burned without complete gasification, and the output of combustible gas will be reduced. The furnace grate needs to be replaced as a whole, and the cost is very high; due to the existence of factors such as the small cross-sectional area of ​​the ash discharge channel and uneven air volume, the thermal ignition loss rate of the ash slag has not been reduced, and the physical and chemical stability of the ash slag needs to be improved; The yield is around 8%-12%, which needs to be improved

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