Optimization Design And Experimental Research Of Biomass Hot Stove For Grain Drying

Biomass is a renewable energy, combustion is an efficient way to make full use of biomass energy. It is crucial important to seek a kind of combustion equipment available on the full use for solving the problem about today’s energy and environment.The combustion characteristics and chemical reaction kinetics of cellulose, xylan, lignin and straw briquette were investigated through thermos gravimetric analysis (TGA). It shows that the unique combustion characteristic of straw briquette is ascribed to the three components of biomass. The weight loss of cellulose and xylan is found during the volatile generation and coke combustion. The lose weight of lignin can be observed below the temperature of 1400℃, which includes two obvious weight loss peaks at temperature above 900℃ and straw briquette has an excellent combustion characteristic. The activation energy E and pre-exponential factor A calculated by fitting equation based on experimental data in the temperature range of 270-360℃ show that the combustion behavior of the three biomass components and the straw briquette is consistent with the law of first-order kinetics. The combustion of lignin is in accordance with the law of the third-order kinetics in 900-960℃ and the law of fourth-order kinetics in 1130-1200℃.The rapid combustion characteristic of corn straw briquette was studied in different formation density and temperature by isothermal thermogravimetric analysis technique. The single equation model of mass loss rate and time was simulated by using a chemical kinetic method. The results show that the corn straw briquette burnout time will be increased along with the rise of the formation density under 60℃, and the time of DTG peak curve reaching more longer; It is verified that among the same density of formation briquette’s burnout time will be lower with the increase of temperature, and the value of peak curve will be higher, and shorter time of reaching peak curve. In the range of this experimental variables, the results showed that the formation density and external temperature had not obvious affect for burn off rate. The calculation of dynamics results show that the reaction order of corn straw formation briquette in the range of 0.5-0.7. Fitting equation are obtained by curve fitting of experimental data to resolve E and A. The study results can provide basic date to design and optimize for the combustion boiler.By analyzing the structure of existing grain drying stove, analysis of the problems and make a rough analysis of the flow field. Put forward a hot blast stove optimization design with high efficiency, fuel wide adaptability, low pollutant emission. And make optimization design of hot blast stove fuel adaptability test, pollutant emission test and performance test. The test results show that the hot blast stove thermal efficiency got obvious improvement, biomass burning has good adaptability, and found some problems in the performance test, continue to optimize provides data support for later.