Experimental Study Of Catalytic Combustion On An Integrated Biomass Gasification-combustion Furnace

Biomass energy has become an important renewable energy under the background of world energy crisis. Biomass gasification is one of the common methods on the utilization of biomass. However, there are some defects with biomass gasification gas, such as low combustion efficiency and NOx pollution. Catalytic combustion of biomass gasification gas was studied in this paper, and the influences of catalyst on the improvement of combustion efficiency and reduction of pollutant emissions were explored.A Pd-Ce/La catalyst was loaded on metal fiber for the catalytic combustion of simulated biomass gasification gas(BGG: CH4-5%, CO-30%, N2-65%with 1200kcal/Nm3 as a benchmark calorific value). Liquefied petroleum gas(LPG) was first used as fuel gas for system commissioning in the preliminary experiment, which verified the reliability of the experiment set-up and produced some of reference data.In BGG catalytic combustion experiment, the average temperatures on every measurement plane in the experiment group(with catalyst) were higher than those in the control group(without catalyst), with BGG flow rate of 4m3/h and air flow rate of 11 m3/h. Compared to the control group, CO, NO and NO2 contents in the experiment group werereduced by 35.3%, 67.2% and 93.1%, respectively.The increase of BGG flow rate caused the increase of CO content in flue gas with a constant air-fuel ratio of 4. More significant decreasesin CO emissions(47.7%, 59.6%, 60.9%) between two groups were observed with three different BGG flow rates(2.5m3/h、3.75m3/h、5m3/h), which indicated a stronger capability of the catalyst in a certain range.The ignition flow rate had little difference between the experiment group and the control group with the air flow rate fixed, which indicated that the Pd-Ce/La catalyst was not able to make BGG easier to ignite in the experimental system. In addition, metal fiber showed an advantage in the reduction of CO, NO and NO2, comparing honeycomb ceramics according to the carrier contrast experiment.The experimental study of the catalytic combustion of BGG on metal fiber provides a guideline to the design and operation of civil biomass gasification stores.