Study Of Biomass Liquid Flow Fuel Cell By Using Bagasse As Direct Fuels

Biomass and biomass waste are ideal sources of energy and carbon-based chemicals,and their research in the fields of preparation of chemicals,fuels and power generation has made some progress.Although biomass can be converted into chemicals and fuels at present,the research progress in the direct use of natural biomass as a substrate is slow,and the related technical reserves are seriously insufficient,which has affected its scale application prospects.Moreover,the current biomass power generation technology mostly uses combustion power generation,and the energy conversion efficiency is low,and it is difficult to achieve efficient conversion of biomass energy to electric energy.In order to realize the efficient conversion of biomass energy to electrical energy,a biomass liquid flow fuel cell that can directly convert biomass and electric energy at low temperature has a good comprehensive performance.However,the biomass liquid flow fuel cells have been studied,and the oxidants of the anode and the cathode are mostly polyoxometallates,which are expensive,complicated in synthesis process,and low in power generation efficiency.This topic firstly studied the oxidative degradation method,degradation mechanism and kinetic behavior of abundant and cheap biomass waste bagasse,and optimized the suitable preparation method of low potential anolyte.Then the preparation and regeneration method of high potential catholyte was studied,and the direct biomass liquid flow fuel cell system was further constructed.And the performance of the fuel cell was systematically studied,and the suitable conditions for direct and efficient conversion of bagasse directly into electrical energy were optimized.The main research work are as follows:?1?A method for oxidatively degrading bagasse using ferric chloride to produce high-value chemicals was studied.The degradation products were characterized by FT-IR,XRD,SEM and HPLC.The results showed that the hemicellulose and lignin structure changed in different degrees,and the amorphous part was degraded and the crystallinity changed.The surface structure has changed significantly,and substances such as hemicellulose and cellulose are decomposed into high value-added chemicals.The oxidative degradation mechanism of sugarcane bagasse was explored.Under the strong oxidation of ferric chloride hydrochloric acid solution,macromolecular organic substances gradually decomposed to form some intermediate products,and then further decomposed to form furan platform chemicals such as 5-hydroxymethylfurfural and furfural.In addition,the oxidative degradation kinetics of ferric chloride on biomass was studied by using the typical intermediate glucose of oxidative degradation of bagasse as a model.The effects of reaction temperature,time and composition of raw materials on the reaction rate were explored.The reaction activation energy and kinetic equation of the degradation reaction are derived.?2?The construction method and performance of the iron-vanadium system of liquid flow fuel cell were studied when bagasse was used as direct fuel.The effects of parameters such as reaction temperature,amount of bagasse and amount of ferric chloride on the preparation of anolyte were investigated.The related performances of the iron-vanadium system liquid flow fuel cell with bagasse as direct fuel were studied.The results showed that the anode low-valent iron electrolyte prepared at a temperature of 110?for bagasse oxidation,2.0 g for bagasse,and 1.5 mol L^-1 for FeCl₃,and the separately prepared high-valence vanadium catholyte were tested at a test temperature of 90?and a flow rate of10 mL min^-1,and the running performance is better,that is,the open loop voltage is 0.7 V,the maximum current density is 1500 mA cm^-2,and the maximum power density is 240mW cm^-2,which indicates the feasibility of using bagasse as a direct fuel.When the output voltage is constant and the iron-vanadium system liquid flow fuel cell is continuously discharged,the current density is stabilized at 250 mA cm^-2,and the fuel cell is basically stable for external power supply.The result further indicates the feasibility of using bagasse as a direct fuel.Bagasse can convert biomass energy into electrical energy through iron-iron system liquid flow fuel cell,which achieves efficient conversion and utilization of biomass waste.In addition,the working principle of the iron-vanadium system liquid flow fuel cell with bagasse as direct fuel is also analyzed.It can be theoretically explained that it is feasible to convert bagasse into electric energy through the fuel cell.?3?The construction method and performance of the iron-iron system of liquid flow fuel cell were studied when bagasse was used as direct fuel.The effect of the concentration of ferric chloride solution on the performance of the catholyte and the regeneration method of the cathodic ferric chloride solution were investigated.The related performances of the iron-iron system liquid flow fuel cell with bagasse as direct fuel were studied.The results showed that the anode low-valent iron electrolyte prepared at a temperature of 110?for bagasse oxidation,2.0 g for bagasse,and 1.5 mol L^-1 for FeCl₃,and the separately prepared high-valence iron catholyte were tested at a test temperature of 90?and a flow rate of10 mL min^-1,and the running performance is better,that is,the open loop voltage is 0.44V,the maximum current density is 780 mA cm^-2,and the maximum power density is 50mW cm^-2,which indicates the feasibility of using bagasse as a direct fuel.When the output voltage is constant and the iron-iron system liquid flow fuel cell is continuously discharged,the current density is stabilized at 200 mA cm^-2,and the cell can be stably supplied to the outside.This result further indicates that the bagasse can be directly used as a fuel through the iron-iron system liquid flow fuel cell converts biomass energy into electrical energy to realize efficient conversion and utilization of biomass waste.At the same time,the conditions for catholyte regeneration were explored,and it was found that nitric acid played a key role in catholyte regeneration.In addition,the working principle of the iron-iron system liquid flow fuel cell with bagasse as direct fuel is also analyzed.It is theoretically possible to demonstrate that bagasse conversion into electrical energy through the fuel cell is completely feasible.