Experimental Study On Calcium-catalyzed Pine Pyrolysis And Steam Gasification

The global modern industrialization is developing rapidly,and the importance of energy to people is self-evident.Today,natural gas,coal,petroleum and other energy sources are still the main energy sources commonly used.Traditional fossil energy is currently an indispensable energy base for people.However,fossil energy has the disadvantages of long regeneration cycles and environmental pollution.Therefore,it is important to find pollution-free and renewable energy sources.The development and utilization of new energy is a new topic proposed by researchers.Biomass energy has the characteristics of wide source,environmental friendliness and renewable.Biomass energy is produced by plants through photosynthesis.Energy conversion is the conversion of solar energy into chemical energy.Biomass energy includes many categories.Biomass Energy The environmental pollution problem is small.Plants can absorb carbon dioxide produced by biomass energy and are environmentally friendly.Biomass pyrolysis gasification is an effective way to convert biomass energy into hydrogen-rich gas.As far as the existing research is concerned,there are certain limitations on the selection and application of the catalyst.The research on the catalyst and the correlation between the products are not complete enough.Thermogravimetric analysis is widely used to study the pyrolysis process of matter and is also an important means of studying kinetic properties.Alkaline earth metal?Ca?has an important influence on biomass gasification reaction.CaO as a catalyst will reduce the activation energy required for the pyrolysis reaction,help the tar to crack into gas,increase gas production,and reduce the production of tar.The transition metal Fe-based catalyst has the advantages of being inexpensive and environmentally friendly,and it has excellent biomass catalytic activity.In addition,dolomite has low strength and poor regeneration performance,and the dolomite is modified.The catalytic performance of calcium-based catalysts for biomass pyrolysis and gasification.The biomass steam gasification experiment system was used to treat the waste pine wood chips as raw materials,and the wood chips were subjected to gasification experiments.The modified gasification experiments were carried out using modified dolomite to analyze the catalytic performance and regeneration performance.In this paper,calcium-based catalysts were used for biomass pyrolysis and gasification experiments to study the effect of calcium-based catalysts on biomass pyrolysis and to analyze the effect of iron on calcium-based catalysts.The effect of calcium-based catalyst on the vaporization of biomass steam was studied.The carbon deposition of the catalyst was analyzed to analyze the regeneration performance of the catalyst.Firstly.The smaller the diameter of pine,the greater the weight loss of pine chips.The weight loss rate of pine sawdust decreased from 64.3%to 50.5%as CaO was added from 20 percent to 40 percent.The catalytic pyrolysis of biomass is better when the catalyst contains 15%Fe.The kinetic parameters of pine sawdust pyrolysis were analyzed by Coats-Redfern method.Under the same conditions,with the increase of Fe content in fe-cao catalyst,the apparent activation energy and index factor first decrease and then increase.Secondly.Cao-ben is the catalyst for gasification experiment.When H₂concentration in the gas production increases from 600?to 700?,it rises rapidly from47.56%to 50.18%,reaching the highest value.However,as the temperature continues to rise,the concentration of H₂ decreases to 49.83%at 800?,and the temperature rises to 1 000?.The percentage of H₂ remains basically unchanged.Fe-cao-ben is the catalyst for gasification experiment,which increases from 600?to 700?.H₂concentration increases from 48.25%to 50.30%,and decreases to 48.63%at 800?.The reason is that hydrogen is consumed during the catalytic cracking of tar by iron oxide in the catalyst.As the temperature increases,the gasification reaction is strengthened.When the temperature is 900?,the value increases to 53.59%,and remains unchanged when the temperature rises to 1 000?.Thirdly.Fe-Dol-Ben is used as the composite catalyst,and the volume fraction of H₂ in gasified gas reaches the maximum value at 900?,while at 1 000?,the volume fraction of H₂ decreases due to catalyst sintering.The carbon deposition decreases gradually with the rise of gasification temperature.Higher gasification temperature is conducive to removing the carbon deposition on the catalyst surface.Considering the gasification effect and the amount of carbon deposition of the catalyst,it is determined that the gasification temperature of 900?is better,and Fe-Dol-Ben composite catalyst has a long service life and good renewable performance.The significance of this research is that the paper tests the biomass pyrolysis and gasification of calcium-based catalysts,studies the mechanism of biomass pyrolysis and gasification,and provides reference for biomass gasification technology.