Catalytic coal gasification technology shows prominent advantages in enhancing coal gasification reactivity and is restrained by the cost of catalyst.Two typical biomass ash additions,corn stalk ash(CSA,high K–Na and...Catalytic coal gasification technology shows prominent advantages in enhancing coal gasification reactivity and is restrained by the cost of catalyst.Two typical biomass ash additions,corn stalk ash(CSA,high K–Na and low Si)and poplar sawdust ash(PSA,high K–Ca and high Si),were employed to study the influence of biomass ash on pyrolysis process and char gasification reactivity of the typical anthracite.Microstructure characteristics of the char samples were examined by X-ray diffraction(XRD).Based on isothermal char-CO2 gasification experiments,the influence of biomass ash on reactivity of anthracite char was determined using thermogravimetric analyzer.Furthermore,structural parameters were correlated with different reactivity parameters to illustrate the crucial factor on the gasification reactivity varied with char reaction stages.The results indicate that both CSA and PSA additives hinder the growth of adjacent basic structural units in a vertical direction of the carbon structure,and then slow down the graphitization process of the anthracite during pyrolysis.The inhibition effect is more prominent with the increasing of biomass ash.In addition,the gasification reactivity of anthracite char is significantly promoted,which could be mainly attributed to the abundant active AAEM(especially K and Na)contents of biomass ash and a lower graphitization degree of mixed chars.Higher K and Na contents illustrate that the CSA has more remarkable promotion effect on char gasification reactivity than PSA,in accordance with the inhibition effect on the order degree of anthracite char.The stacking layer number could reasonably act as a rough indicator for evaluating the gasification reactivity of the char samples.展开更多
The chemical characteristics,element contents,mineral compositions,and the ameliorative effects on acid soils of five biomass ashes from different materials were analyzed. The chemical properties of the ashes varied d...The chemical characteristics,element contents,mineral compositions,and the ameliorative effects on acid soils of five biomass ashes from different materials were analyzed. The chemical properties of the ashes varied depending on the source biomass material. An increase in the concrete shuttering contents in the biomass materials led to higher alkalinity,and higher Ca and Mg levels in biomass ashes,which made them particularly good at ameliorating effects on soil acidity. However,heavy metal contents,such as Cr,Cu,and Zn in the ashes,were relatively high. The incorporation of all ashes increased soil p H,exchangeable base cations,and available phosphorus,but decreased soil exchangeable acidity. The application of the ashes from biomass materials with a high concrete shuttering content increased the soil available heavy metal contents. Therefore,the biomass ashes from wood and crop residues with low concrete contents were the better acid soil amendments.展开更多
Previously,the once-through CO_(2)chemical absorption process by biogas slurry was experimentally verified to offer the unique advantages like low energy consumption,cost-effectiveness,and feasibility of CO_(2)fixatio...Previously,the once-through CO_(2)chemical absorption process by biogas slurry was experimentally verified to offer the unique advantages like low energy consumption,cost-effectiveness,and feasibility of CO_(2)fixation in plants.However,this technology also faces some challenges and limitations,including a low CO_(2)absorption rate and performance.To improve the effectiveness and reliability of this innovative carbon capture,utilization,and storage(CCUS)technology,this study proposes a novel method to enhance the CO_(2)absorption performance without affecting agricultural applications of CO_(2)by mixing biogas slurry with biomass ash as the green CO_(2)absorbent.The results indicate that when the solid-liquid mass ratio of biomass ash to biogas slurry is 5:10,the CO_(2)loading of the biomass ash and biogas slurry mixture(BA-BS)reaches 936.7±59.1 mmol/kg.Furthermore,the pH of the BA-BS remains stable at 6.9,meeting the rhizosphere pH requirements for plant cultivation.The CO_(2)absorption of the BA-BS liquid phase,referred to as improved biogas slurry(IBS),reaches its maximum at 230.4±3.5 mmol/L,which is 126.8%higher than that of the unimproved biogas slurry.The nitrogen content in the BA-BS solid phase,calling improved biomass ash(IBA),also reaches its maximum at 4.24±0.74 mg/g,thereby expanding the agricultural utilization of biomass ash.The most reasonable and effective way of utilizing CO_(2)-rich mixed biogas slurry and biomass ash involves use IBA as the base fertilizer for tomato cultivation,supplemented later with IBS to promote growth.This optimal application allows for substantial utilization of CO_(2),introduced into the tomato cultivation environment by IBA and IBS.The carbon fixation of a single tomato has improved by 108.2%.This study thus provides a feasible solution for high-value negative carbonization of biogas slurry and biomass ash.展开更多
The gasification industries make use of biomass residue as feedstock to produce synthesis gas,but the gasification of this waste biomass generates tons of ash everyday.Performance properties and agglomeration behavior...The gasification industries make use of biomass residue as feedstock to produce synthesis gas,but the gasification of this waste biomass generates tons of ash everyday.Performance properties and agglomeration behavior of corncob ash(CCA) collected from the gasification of corncobs in a pilot-scale gasification station were investigated by using some experimental methods.Based on the chemical composition results,the agglomeration tendency of CCA from combustion and gasification process was also analyzed.Chemical analysis shows that the fly ash is mainly composed of inorganic matters formed by K,Mg,Ca,Na,Fe,Al,S,etc.The agglomeration characteristics indicate that the slagging degree increases with the increase of ashing temperature,and the slagging tendency of these CCA samples from gasification or combustion is different with various slagging indices.All CCA samples from combustion or gasification can cause slagging/fouling problems in thermal conversion systems.The applications of CCA are closely related to its performances,and CCA has the potential to be used in various fields,for example,as a material for ceramic products and activated carbon,as an adsorbent,as a crude fertilizer,and as a structural material.展开更多
基金This work was financial supported by Natural Science Foundation of Shanxi Province(Grant Number 201801D12105)Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province(Grant Number 2017006)Shanxi Scholarship Council of China(Grant Number 2017-086).
文摘Catalytic coal gasification technology shows prominent advantages in enhancing coal gasification reactivity and is restrained by the cost of catalyst.Two typical biomass ash additions,corn stalk ash(CSA,high K–Na and low Si)and poplar sawdust ash(PSA,high K–Ca and high Si),were employed to study the influence of biomass ash on pyrolysis process and char gasification reactivity of the typical anthracite.Microstructure characteristics of the char samples were examined by X-ray diffraction(XRD).Based on isothermal char-CO2 gasification experiments,the influence of biomass ash on reactivity of anthracite char was determined using thermogravimetric analyzer.Furthermore,structural parameters were correlated with different reactivity parameters to illustrate the crucial factor on the gasification reactivity varied with char reaction stages.The results indicate that both CSA and PSA additives hinder the growth of adjacent basic structural units in a vertical direction of the carbon structure,and then slow down the graphitization process of the anthracite during pyrolysis.The inhibition effect is more prominent with the increasing of biomass ash.In addition,the gasification reactivity of anthracite char is significantly promoted,which could be mainly attributed to the abundant active AAEM(especially K and Na)contents of biomass ash and a lower graphitization degree of mixed chars.Higher K and Na contents illustrate that the CSA has more remarkable promotion effect on char gasification reactivity than PSA,in accordance with the inhibition effect on the order degree of anthracite char.The stacking layer number could reasonably act as a rough indicator for evaluating the gasification reactivity of the char samples.
基金supported by the National Key Basic Research Program of China(No.2014CB441003)the National Key Research and Development of China(No.2016YFD0200302)
文摘The chemical characteristics,element contents,mineral compositions,and the ameliorative effects on acid soils of five biomass ashes from different materials were analyzed. The chemical properties of the ashes varied depending on the source biomass material. An increase in the concrete shuttering contents in the biomass materials led to higher alkalinity,and higher Ca and Mg levels in biomass ashes,which made them particularly good at ameliorating effects on soil acidity. However,heavy metal contents,such as Cr,Cu,and Zn in the ashes,were relatively high. The incorporation of all ashes increased soil p H,exchangeable base cations,and available phosphorus,but decreased soil exchangeable acidity. The application of the ashes from biomass materials with a high concrete shuttering content increased the soil available heavy metal contents. Therefore,the biomass ashes from wood and crop residues with low concrete contents were the better acid soil amendments.
基金funded by the National Natural Science Foundation of China(Nos.52076101,32360335)the Knowledge Innovation Program of Wuhan-Basic Research(No.2023020201010108)+3 种基金the Fundamental Research Funds for the Central Universities(No.2662023GXPY001)the High-level Talents Scientific Research Start-up Fund Project of Yulin University(No.2023GK47)the“New Star of Science and Technology”Talent Program of Yulin(No.CXY-2022-137)the Young Talent Fund of Association for Science and Technology in Yulin(No.20230514)。
文摘Previously,the once-through CO_(2)chemical absorption process by biogas slurry was experimentally verified to offer the unique advantages like low energy consumption,cost-effectiveness,and feasibility of CO_(2)fixation in plants.However,this technology also faces some challenges and limitations,including a low CO_(2)absorption rate and performance.To improve the effectiveness and reliability of this innovative carbon capture,utilization,and storage(CCUS)technology,this study proposes a novel method to enhance the CO_(2)absorption performance without affecting agricultural applications of CO_(2)by mixing biogas slurry with biomass ash as the green CO_(2)absorbent.The results indicate that when the solid-liquid mass ratio of biomass ash to biogas slurry is 5:10,the CO_(2)loading of the biomass ash and biogas slurry mixture(BA-BS)reaches 936.7±59.1 mmol/kg.Furthermore,the pH of the BA-BS remains stable at 6.9,meeting the rhizosphere pH requirements for plant cultivation.The CO_(2)absorption of the BA-BS liquid phase,referred to as improved biogas slurry(IBS),reaches its maximum at 230.4±3.5 mmol/L,which is 126.8%higher than that of the unimproved biogas slurry.The nitrogen content in the BA-BS solid phase,calling improved biomass ash(IBA),also reaches its maximum at 4.24±0.74 mg/g,thereby expanding the agricultural utilization of biomass ash.The most reasonable and effective way of utilizing CO_(2)-rich mixed biogas slurry and biomass ash involves use IBA as the base fertilizer for tomato cultivation,supplemented later with IBS to promote growth.This optimal application allows for substantial utilization of CO_(2),introduced into the tomato cultivation environment by IBA and IBS.The carbon fixation of a single tomato has improved by 108.2%.This study thus provides a feasible solution for high-value negative carbonization of biogas slurry and biomass ash.
基金Project(2013020137)supported by the Natural Science Foundation of Liaoning Province,ChinaProject(2015-36)supported by Rural Energy Comprehensive Construction Foundation of the Ministry of Agriculture,China
文摘The gasification industries make use of biomass residue as feedstock to produce synthesis gas,but the gasification of this waste biomass generates tons of ash everyday.Performance properties and agglomeration behavior of corncob ash(CCA) collected from the gasification of corncobs in a pilot-scale gasification station were investigated by using some experimental methods.Based on the chemical composition results,the agglomeration tendency of CCA from combustion and gasification process was also analyzed.Chemical analysis shows that the fly ash is mainly composed of inorganic matters formed by K,Mg,Ca,Na,Fe,Al,S,etc.The agglomeration characteristics indicate that the slagging degree increases with the increase of ashing temperature,and the slagging tendency of these CCA samples from gasification or combustion is different with various slagging indices.All CCA samples from combustion or gasification can cause slagging/fouling problems in thermal conversion systems.The applications of CCA are closely related to its performances,and CCA has the potential to be used in various fields,for example,as a material for ceramic products and activated carbon,as an adsorbent,as a crude fertilizer,and as a structural material.
