Preparation Of Biomass Porous Carbon And Its Application As SOFC Fuel

Biomass porous carbon has many advantages such as developed pores,stable organizational structure,high specific surface area,stable chemical properties,and good electrical conductivity.It has been widely used in batteries,catalysts,sewage purification,and soil structure improvement.At present,there are many problems in the preparation of biomass porous carbon,such as high cost,complex process and difficult to accurately control the pore structure.Therefore,it is of great significance to explore a preparation method of biomass porous carbon with low cost,simple process and easy regulation of product performance.In this paper,Pinus sylvestris var.mongolica(cold zone),pine(temperate zone)and Platanus acerifolia leaves(research site)were used as carbon sources to prepare biomass porous carbon by solvothermal carbonization method.Biomass porous carbon was used as the fuel of solid oxide fuel cell(SOFC)to study their power conversion performance,and the design of single cell test device and overall power generation system was carried out.The main research contents and results are as follows:1.Biomass porous carbon materials were prepared by solvothermal carbonization method and characterized.The differences in structural morphology,elemental composition and pore characteristics of biomass porous carbon materials prepared from biomass in different regions under the same treatment conditions were studied by characterization results.The carbonization yield and ash content of three different biomasses were compared and analyzed.The results showed that the carbonization yield(30.03 wt.%)and ash content(0.97 wt.%)of Pinus sylvestris were the lowest,the carbonization yield(31.09 wt.%)and ash content(2.19 wt.%)of Pinus massoniana were medium,and the carbonization yield(42.52 wt.%)and ash content(9.27 wt.%)of Platanus orientalis leaves were the highest.The morphological structure,elemental composition and pore characteristics of biomass porous carbon were further characterized and analyzed.The results showed that the carbon of Pinus sylvestris var.mongolica was a lamellar block structure,with a carbon content of 96.13 wt.%and a specific surface area of 336.06 m~2/g.Pine charcoal also has a lamellar structure,with a carbon content of 88.83 wt.%and a specific surface area of 367.95 m~2/g.The carbon of Platanus acerifolia leaves was a rod-like structure with curled thin carbon sheets,with a carbon content of 83.31 wt.%and a specific surface area of 252.07 m~2/g..2.The electrical performance parameters of different biomass porous carbons as fuels were compared and studied.The voltage,current,power density,contact resistance and power density were mainly studied.The test results showed that the power density of Pinus sylvestris carbon was 157.74 m W/cm~2;the power density of pine charcoal was 184.41 m W/cm~2.The power density of Platanus acerifolia leaf charcoal was 134.72 m W/cm~2.The anode surface and cross-section of the single cell before and after the electrical performance test were characterized by SEM to observe the changes of its morphology and structure.The results showed that cracks appeared on the anode surface,and the maximum width of the crack was about 1243 nm.Pore collapse and sintering occurred inside the cross-section.The biomass porous carbon after the electrical performance test was characterized by SEM.The results showed that the biomass porous carbon had agglomeration.3.The feasibility of using the prepared biomass porous carbon as a solid fuel on SOFC was confirmed by experiments.The single cell test device was designed and improved to solve the problem of internal and outlet temperature detection.Based on the feasibility of SOFC electrical performance test device,an improved design scheme of SOFC power generation system is proposed,which mainly includes the schematic diagram of the working principle of the whole machine,the structural scheme of each module,the hardware,software and gas path of the power generation system.The key points and difficulties in the development and promotion of the whole machine are put forward,and the risk analysis of the design scheme is carried out.