Gradually-expanding premixing porous medium combustor for combusting biomass gasification gas

Abstract

The invention relates to a gradually-expanding premixing porous medium combustor for combusting biomass gasification gas. The combustor is provided with gradually-expanding pipes, wherein a porous medium with catalytic action is filled in each gradually-expanding pipe; a heater is coated outside each gradually-expanding pipe; each gradually-expanding pipe is wholly embedded into a thermal insulating layer; a capacity expansion chamber is formed at an inlet of each gradually-expanding pipe; a tempering prevention piece and a flow equalization plate are arranged in each capacity expansion chamber; and an inlet of each capacity expansion chamber is connected with a premixing tube. Flame deflection and other unstable combustion phenomena can be avoided, flames can be effectively prevented from being blown out of the combustor, the power of the combustor is improved, the working range of the combustor is expanded, and the load and working condition changes of the combustor are met. Moreover, the combustor has a function of adjusting gas flow, and parallel gradually-expanding pipes are prevented from being shut down due to over-low load or prevented from being subjected to over-high load; and the biomass gasification gas can be subjected to super adiabatic combustion in the combustor, the lean flammability limit of fuel is greatly expanded, and the fuel with ultralow heat value can be stably combusted. Meanwhile, the flame area is widened, the combustor contributes to accelerating cracking combustion of tar, and the combustion efficiency is improved.

Description

technical field [0001] The invention relates to a burner capable of utilizing renewable energy biomass, in particular to a gradual expansion premixed porous medium burner for burning biomass gasification gas, and belongs to the technical field of combustion equipment. Background technique [0002] Biomass energy is the energy that fixes the energy of solar radiation in the form of biomass through the photosynthesis of green plants. Biomass energy, as a renewable energy source, can partially alleviate human dependence on other non-renewable resources. [0003] Compared with coal burning, biomass fuel has the characteristics of high volatile content, fast pyrolysis speed, low energy density, easy slagging during combustion, and corrosion to metal equipment. When the existing equipment is directly converted to burn biomass fuel, due to the large difference between the design fuel of the original equipment and the properties of biomass, there are often problems such as insuff...

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Problems solved by technology

[0006] The present invention aims at the problems existing in the above-mentioned prior art, and considers the problems of high tar content and low combustion calorific value of biomass gasification gas, and provides a gradual expansion premixed porous media burner for burning biomass gasification gas, It solves the problem that the burner in the prior art is difficult to achieve high combustion efficiency and the tar content in the flue gas is too high for biomass fuel

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