Writer： admin Time：2021-12-25 00:00 Browse：℃
Biomass fuel burners is wood waste and agricultural waste as raw material compressed into feed pellets similar biomass as wood pellets, by an automatic feeding device to the biomass particles to the combustion chamber for direct combustion, the gas burner biomass gasification high temperature smelting furnace
The melting temperature gas burner biomass gasifier
Smelting burner biomass gasifier can be divided into four stages, i.e., a base charge charged to the softening, softening to a base level of charge, the charge level of the fully melted (this stage oxidation dross), liquid aluminum warming. Heating the aluminum material is radiation heat transfer convective heat, flame and furnace walls and heat conduction between the aluminum material is accomplished by the burner flame. Throughout the process, the ratio between the three is constantly changing. Small black aluminum in the solid state, strong thermal conductivity. As the melting process, a semi-solid charge into the semi-liquid critical state, the heat capacity decreased, the thermodynamic properties of a fundamental change. The thermal conductivity of liquid aluminum is only 40% of solid aluminum, the upper portion of the bath to the bottom of the conduction heat transfer process is very slow. Metal floating on the insulating barrier layer mirror composed of loose dross heat transfer. At this time, the bath surface of the oxide film is opened, the loss of protection, oxidation, tends to enhance suction. Flame burner for biomass gasifier in terms of aluminum in the melting period, the furnace temperature is controlled at 1200 deg.] C, the furnace flue gas temperature at this time is the furnace temperature, the furnace flue gas heat away heat load of about 50-70%, taking into account the other 10% of heat loss, the effective heat utilization is only 30% to 40%, if you do not take advantage of this part of the waste heat is bound to cause great waste, low thermal efficiency of the furnace. In summary, selection of effective heating and enhanced recovery of flue gas waste heat to preheat the combustion air to improve the thermal efficiency of the furnace, effective way of ensuring a direct smelting process less fuel consumption. High temperature air combustion high temperature air combustion technology changed the traditional combustion, flue gas recirculation or by using the direct fuel injection combustion furnace way, mainly through the ceramic honeycomb combustion air is preheated to above 1000 ℃, a suitable injection velocity into the furnace, the high-speed air entrainment, mixing and stirring action of the furnace combustion products, air diluted 21% oxygen, low oxygen concentration in the combustion fluid (5% to 6.5% lower), high temperature air in combustion can be achieved under conditions of low air ratio combustion, reducing the oxidation loss of aluminum. Regenerative combustion system mainly includes a pair of burners with heat accumulator, a reversing device, a control system and the piping system. When the furnace temperature is 1000 ~ 1200 ℃, combustion air can be preheated to a temperature of 800 ~ 1000 ℃, compared with the use of recuperative heat exchanger air fuel the biomass gasifier burner fuel savings of about 50%. Actual discharge outlet of the burner in a mixed gas velocity 60m / s or so, the flame length of about 2.5 ~ 3m, flame diameter of about 0.5 ~ 0.7m. A pair of burner furnace commutation operation, the high temperature zone frequently interchanged, to ensure a uniform furnace temperature, does not form a low temperature region.
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