期刊文献+
共找到373篇文章
< 1 2 19 >
每页显示 20 50 100
Experimental study on the activation of coal gasification fly ash from industrial CFB gasifiers
1
作者 Qiyao Yang Xiaobin Qi +1 位作者 Qinggang Lyu Zhiping Zhu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第1期8-18,共11页
Coal gasification fly ash(CGFA)is an industrial solid waste from the coal circulating fluidized bed(CFB)gasification process,and it needs to be effectively disposed to achieve sustainable development of the environmen... Coal gasification fly ash(CGFA)is an industrial solid waste from the coal circulating fluidized bed(CFB)gasification process,and it needs to be effectively disposed to achieve sustainable development of the environment.To realize the application of CGFA as a precursor of porous carbon materials,the physicochemical properties of three kinds of CGFA from industrial CFB gasifiers are analyzed.Then,the activation potential of CGFA is acquired via steam activation experiments in a tube furnace reactor.Finally,the fluidization activation technology of CGFA is practiced in a bench-scale CFB test rig,and its advantages are highlighted.The results show that CGFA is characterized by a high carbon content in the range of 54.06%–74.09%,an ultrafine particle size(d50:16.3–26.1 μm),and a relatively developed pore structure(specific surface area SSA:139.29–551.97 m^(2)·g^(-1)).The proportion of micropores in CGFA increases gradually with the coal rank.Steam activation experiments show that the pore development of CGFA mainly includes three stages:initial pore development,dynamic equilibrium between micropores and mesopores and pore collapse.The SSA of lignite fly ash(LFA),subbituminous fly ash(SBFA)and anthracite fly ash(AFA)is maximally increased by 105%,13%and 72%after steam activation;the order of the largest carbon reaction rate and decomposition ratio of steam among the three kinds of CGFA is SBFA>LFA>AFA.As the ratio of oxygen to carbon during the fluidization activation of LFA is from 0.09 to 0.19,the carbon conversion ratio increases from 14.4%to 26.8%and the cold gas efficiency increases from 6.8%to 10.2%.The SSA of LFA increases by up to 53.9%during the fluidization activation process,which is mainly due to the mesoporous development.Relative to steam activation in a tube furnace reactor,fluidization activation takes an extremely short time(seconds)to achieve the same activation effect.It is expected to further improve the activation effect of LFA by regulating the carbon conversion ratio range of 27%–35%to create pores in the initial development stage. 展开更多
关键词 Circulating fluidized bed Coal gasification fly ash steam activation Pore structure evolution Fluidization activation
下载PDF
Investigation on the catalytic effects of AAEM during steam gasification and the resultant char reactivity in oxygen using Shengli lignite at different forms 被引量:14
2
作者 Jianxin Mi Ningbo Wang Mingfeng Wang Pengju Huo Dan Liu 《International Journal of Coal Science & Technology》 EI 2015年第3期223-231,共9页
The purpose of this study is to investigate the catalytic effects of alkali and alkaline earth metallic species (AAEM) on char conversion during the gasification in steam and the changes in ex-situ char reactivity i... The purpose of this study is to investigate the catalytic effects of alkali and alkaline earth metallic species (AAEM) on char conversion during the gasification in steam and the changes in ex-situ char reactivity in oxygen after the gasification in steam using different forms (i.e. H-form, Na-form) of Shengli brown coal. The surface area, AAEM concentration and carbon crystallite of chars were obtained to understand the change in char reactivity. It was found that not only Na concentration and carbon structure were the main factors governing the char reactivity in the atmosphere of steam and oxygen, but also they interacted each other. The presence of Na could facilitate the formation of disordering carbon structure in char, and the amorphous carbon structure would in turn affect the distribution of Na and thus its catalytic performance. The surface area and pore volume had very little relationship with the char's reactivity. Addi- tionally, the morphology of chars from different forms of coals were observed using scanning electron microscope (SEM). 展开更多
关键词 steam gasification H-form coal Na-form coal Char reactivity Char structure
下载PDF
Investigation on Steam Gasification of High-metamorphous Anthracite Using Mixed Black Liquor and Calcium Catalyst 被引量:8
3
作者 Gul-e-Rana JAFFRI 张济宇 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第4期575-583,共9页
The catalytic effects of single and mixed catalysts, i.e. single 3%Ca and 5%Na-BL(black liquor) catalysts and mixed 3%Ca+5%Na-BL catalyst, on carbon conversion, gasification reaction rate constant and activation en... The catalytic effects of single and mixed catalysts, i.e. single 3%Ca and 5%Na-BL(black liquor) catalysts and mixed 3%Ca+5%Na-BL catalyst, on carbon conversion, gasification reaction rate constant and activation energy, relative amount of harmful pollutant like sulphur containing gases have been investigated by thermogravimetry in steam gasification under temperature 750℃ to 950℃ at ambient pressure for three high-metarnorphous anthracites (Longyan, Fenghai and Youxia coals in Fujian Province). The mixed catalyst of 3%Ca+5%Na-BL increases greatly the carbon conversion and gasification rate constant by accelerating the gasification reaction C+H2O→CO+H2 due to presence of alkali surfacecompounds [COM], [CO2M] and exchanged calcium phenolate and calcium carboxylate (-COO)2. By adding CaCO3 into BL catalyst in gasification, in addition to improving the catalyst function and enhancing the carbon conversion, the effective desulphurization is also achieved, but the better operating temperature should be below 900℃. The homogenous and shrinking core models can be successfully employed to correlate the relations between the conversion and the gasification .time .and to estimate the reaction rate constant, The reaction acUvaUon energy and pre-exponential factor are estimated and the activation energy for mixed catalyst is in a range of 98.72-166.92 kJ·mol^-1, much less than 177.50-196.46 kJ·mol^-1 for non-catalytic steam gasification for three experimental coals. 展开更多
关键词 mixed catalyst CALCIUM black liquor THERMOGRAVIMETRY steam gasification kinetics sulphur containing gas
下载PDF
Effects of inherent alkali and alkaline earth metals on nitrogen transformation during steam gasification of Shengli lignite 被引量:2
4
作者 Panpan Zheng Yonggang Wang +4 位作者 Chen Liu Weijie Guo Lei Bai Xiao Hu Xiongchao Lin 《International Journal of Coal Science & Technology》 EI 2019年第2期197-206,共10页
This work evaluated the effects of inherent alkali and alkaline earth metals on nitrogen transformation during steam gasification of Shengli lignite at the temperature of 873-1173 K in a fluidized-bed/fixed-bed quartz... This work evaluated the effects of inherent alkali and alkaline earth metals on nitrogen transformation during steam gasification of Shengli lignite at the temperature of 873-1173 K in a fluidized-bed/fixed-bed quartz reactor. The results indicated that the alkali metal Na and alkaline earth metals Ca, Mg in coal have different effects on inherent nitrogen transformation to NH3, HCN and char-N during the lignite steam gasification. Specifically during the steam gasification of Shengli lignite, Na and Ca, Mg not only catalyze the inherent nitrogen conversions to NH3, but also promote the secondary reactions of the nascent char-N as well as the generation of NH3 from the generated HCN, meanwhile they also inhibited the inherent nitrogen conversion to HCN and char-N. The presence of Na, Ca and Mg hindered the formation of oxidized nitrogen (N-X) functional groups, but enhanced pyridinic nitrogen (N-6) and quaternary nitrogen's (N-Q) formation in char. 展开更多
关键词 LIGNITE steam gasification NITROGEN transformation ALKALI metal-Alkaline earth METAL
下载PDF
Steam Gasification of Different Brown Coals Catalysed by the Naturally Occurring Calcium Species 被引量:1
5
作者 Peter N. Kuznetsov Svetlana M. Kolesnikova Ludmila I. Kuznetsova 《International Journal of Clean Coal and Energy》 2013年第1期1-11,共11页
The effects of the constituents of mineral matter in brown coals from different deposits of Kansk-Achinsk, Lenaand from Yallourn Basins on the structural parameters and steam gasification reactivities of respective co... The effects of the constituents of mineral matter in brown coals from different deposits of Kansk-Achinsk, Lenaand from Yallourn Basins on the structural parameters and steam gasification reactivities of respective coal chars at moderate temperature and at low and high pressure were studied in this paper. The data on how the preliminary decationization with diluted hydrochloric, acetic and sulphuric acids affect char gasification reactivities are presented. The importance of surface area and crystallinity of chars and the presence of naturally occurring metals on gasification reactivity is considered. Quantitative correlations between the calcium contents and the extents of gasification are revealed. The gasification results obtained in a flow reactor with steam stream and in an autoclave reactor at high pressure of gaseous products are compared. The catalytic effect of dispersed calcium oxide-carbonate particles produced from the naturally occurring calcium containing carboxylates was shown to be a key factor for char gasification reactivity, the effect in the flow reactor being much larger as compared to that in the autoclave reactor. This was mainly related to different forms of catalytically active calcium species and to the composition of the gaseous reaction mixture. 展开更多
关键词 Coal MINERAL MATTER steam gasification CALCIUM CATALYSIS
下载PDF
Solid oxide fuel cells in combination with biomass gasification for electric power generation 被引量:6
6
作者 Huangang Shi Qianjun Li +2 位作者 Wenyi Tan Hao Qiu Chao Su 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第4期1156-1161,共6页
Biomass,a source of renewable energy,represents an effective substitute to fossil fuels.Gasification is a process that organics are thermochemically converted into valuable gaseous products(e.g.biogas).In this work,th... Biomass,a source of renewable energy,represents an effective substitute to fossil fuels.Gasification is a process that organics are thermochemically converted into valuable gaseous products(e.g.biogas).In this work,the catalytic test demonstrated that the biogas produced from biomass gasification mainly consists of H2,CH4,CO,and CO2,which were then be used as the fuel for solid oxide fuel cell(SOFC).Planar SOFCs were fabricated and adopted.The steam reforming of biogas was carried out at the anode of a SOFC to obtain a hydrogen-rich fuel.The performance of the SOFCs operating on generated biogas was investigated by I-V polarization and electrochemical impedance spectra characterizations.An excellent cell performance was obtained,for example,the peak power density of the SOFC reached 1391 mW·cm-2 at 750℃when the generated biogas was used as the fuel.Furthermore,the SOFC fuelled by simulated biogas delivered a very stable operation. 展开更多
关键词 Biomass gasification BIOGAS Solid oxide fuel cell steam reforming
下载PDF
Influence of Catalyst and Temperature on Gasification Performance by Externally Heated Gasifier 被引量:1
7
作者 Yu Feng Bo Xiao +2 位作者 Klaus Goerner Gong Cheng Jingbo Wang 《Smart Grid and Renewable Energy》 2011年第3期177-183,共7页
In the present study the catalytic steam gasification of biomass to produce hydrogen-rich gas with calcined dolomite and Nano-NiO/γ-Al2O3 as catalyst in an externally heated fixed bed reactor was investigated. The in... In the present study the catalytic steam gasification of biomass to produce hydrogen-rich gas with calcined dolomite and Nano-NiO/γ-Al2O3 as catalyst in an externally heated fixed bed reactor was investigated. The influence of the catalyst and reactor temperature on yield and product composition was studied at the temperature range of 700oC - 900oC. Over the ranges of experimental conditions examined, calcined dolomite revealed better catalytic performance, at the presence of steam, tar was completely decomposed as temperature increases from 800oC to 900oC. Higher temperature resulted in more H2 and CO2 production, and dry gas yield. The highest H2 content of 51.02 mol%, and the highest H2 yield of 1.66 m3/kg biomass were observed at the highest temperature level of 900oC. 展开更多
关键词 Hydrogen Rich Gas Biomass steam gasification DOLOMITE CATALYST
下载PDF
A biomass gasification system for synthesis gas from the new method
8
作者 Li-Qun Wang Yu-Huan Dun +1 位作者 Heng Tang Tong-Zhang Wang 《Natural Science》 2009年第3期195-203,共9页
This paper describes a single fluidized bed by the two-step gasification of the working method, process and biomass and coal co-gasification by a certain proportion of the results of a typical run. The results show th... This paper describes a single fluidized bed by the two-step gasification of the working method, process and biomass and coal co-gasification by a certain proportion of the results of a typical run. The results show that the biomass gasifi-cation technology for raw materials has a wide adaptability, the tar content in the gas is less than 10mg/m3,component in it ,the H2+CO>70%, H2/C ≈1~2,especially suitable for biomass from hydrogen, synthetic alcohol fuel, is a promising approach. 展开更多
关键词 Fuidized BED Double BED BIOMASS Synthesis Gas CO-gasification steam gasification
下载PDF
Influence of Particle Size and Temperature on Gasification Performance in Externally Heated Gasifier
9
作者 Yu Feng Bo Xiao +2 位作者 Klaus Goerner Gong Cheng Jingbo Wang 《Smart Grid and Renewable Energy》 2011年第2期158-164,共7页
In the present study the catalytic steam gasification of biomass to produce hydrogen-rich gas with calcined dolomite as catalyst in an externally heated fixed bed reactor was investigated. The influence of the reactor... In the present study the catalytic steam gasification of biomass to produce hydrogen-rich gas with calcined dolomite as catalyst in an externally heated fixed bed reactor was investigated. The influence of the reactor temperature on yield and product composition was studied at the temperature range of 700 PoPC-900 PoPC. Over the ranges of experimental con-ditions examined, tar was completely decomposed as temperature increases from 800P oPC to 900 PoPC. Higher temperature resulted in more HR2R and COR2R production, and dry gas yield. The highest H2 content of 51.02 V%, and the highest HR2 Ryield of 1.66 mP3P/kg biomass were observed at the highest temperature level of 900P oPC. 展开更多
关键词 Hydrogen RICH Gas BIOMASS steam gasification Particle Size
下载PDF
Hydrogen as Carbon Gasifying Agent During Glycerol Steam Reforming over Bimetallic Co-Ni Catalyst
10
作者 Chin Kui Cheng Rwi Hau Lim +2 位作者 Anabil Ubil Sim Yee Chin Jolius Gimbun 《Advances in Materials Physics and Chemistry》 2012年第4期165-168,共4页
Alumina-supported bimetallic cobalt-nickel catalyst has been prepared and employed in a fixed-bed reactor for the direct production of synthesis gas from glycerol steam reforming. Physicochemical properties of the 5Co... Alumina-supported bimetallic cobalt-nickel catalyst has been prepared and employed in a fixed-bed reactor for the direct production of synthesis gas from glycerol steam reforming. Physicochemical properties of the 5Co-10Ni/85Al2O3 catalyst were determined from N2-physisorption, H2-chemisorption, CO2 and NH3-temperature-programmed desorption measurements as well as X-ray diffraction analysis. Both weak and strong acid sites are present on the catalyst surface. The acidic:basic ratio is about 7. Carbon deposition was evident at 923 K;addition of H2 however has managed to reduce the carbon deposition. Significantly, this has resulted in the increment of CH4 formation rate, consistent with the increased carbon gasification and methanation. Carbon deposition was almost non-existent, particularly at 1023 K. In addition, the inclusion of hydrogen also has contributed to the decrease of CO2 and increase of CO formation rates. This was attributed to the reverse water-gas-shift reaction. Overall, both the CO2:CO and CO2:CH4 ratios decrease with the hydrogen partial pressure. 展开更多
关键词 CARBON Deposition CATALYST gasification GLYCEROL steam REFORMING
下载PDF
Biomass Vapogasification in Fluidized Bed: Modelling of Char Population Balance and Experimental Validation
11
作者 Marc Detoumay Mehrdji Hemati 《Journal of Chemistry and Chemical Engineering》 2010年第12期38-51,共14页
The article presents a population balance model by mass developed for studying char gasification by steam occuring in a fluidized bed. The model has been validated by comparison with existing theoretical and experimen... The article presents a population balance model by mass developed for studying char gasification by steam occuring in a fluidized bed. The model has been validated by comparison with existing theoretical and experimental cases. Its main goal is to have a better understanding on particles size distribution behaviour during operation of the fluidized bed, and in particular to be applied on the case of Fast Internally Circulating Fluidized Beds for char gasification. Results have shown that the initial properties of the fluidized bed particles (bed and size distribution) are almost not involved in the steady state obtained in continous operation, which is excusively dependent on the properties of the fed particles flow rate and size distribution, the withdrawal flow rate and the reaction properties. Morevoer, it has been proven that the steady state fluidized bed mass and size distribution may be theroretically controlled by an adequate choice of feeding and withdrawal flow rates. 展开更多
关键词 Population balance size distribution steam gasification BIOMASS CHAR particles.
下载PDF
梨木炭蒸汽气化制取富氢燃气的试验研究
12
作者 张彪 兰祯 别如山 《工业锅炉》 2024年第1期1-7,共7页
生物质气化技术已得到广泛的应用,但气化过程产生的焦油会影响设备稳定运行。为了大幅减少焦油的干扰,以梨木的热解炭为原料,在管式炉中进行水蒸气气化制取富氢燃气试验研究,探究了反应温度、K_(2)CO_(3)添加量及利用次数对气化特性的... 生物质气化技术已得到广泛的应用,但气化过程产生的焦油会影响设备稳定运行。为了大幅减少焦油的干扰,以梨木的热解炭为原料,在管式炉中进行水蒸气气化制取富氢燃气试验研究,探究了反应温度、K_(2)CO_(3)添加量及利用次数对气化特性的影响。结果表明:900℃时H_(2)的产气量为2.19 L/g,合成气中H_(2)含量超过58%;K_(2)CO_(3)添加量为10%时产气效果最佳,此时合成气中H_(2)+CO含量达到了88.5%。当K_(2)CO_(3)催化剂在第三次利用时,仍有较好的催化效果。 展开更多
关键词 梨木炭 蒸汽气化 K_(2)CO_(3) 富氢气体
下载PDF
模拟生活干垃圾循环流化床气化试验
13
作者 何守琪 刘志成 +1 位作者 王小芳 蔡军 《洁净煤技术》 CAS CSCD 北大核心 2024年第9期156-164,共9页
为给工业化循环流化床垃圾气化技术研发提供基础数据,在中试规模循环流化床气化试验台,研究过量空气系数和系统富氧体积分数对模拟生活干垃圾(简称“干垃圾”)气化特性影响。试验用干垃圾为单组分垃圾料配置而成的压块料,组成包括纸张... 为给工业化循环流化床垃圾气化技术研发提供基础数据,在中试规模循环流化床气化试验台,研究过量空气系数和系统富氧体积分数对模拟生活干垃圾(简称“干垃圾”)气化特性影响。试验用干垃圾为单组分垃圾料配置而成的压块料,组成包括纸张、织物、木屑、灰渣和水,分别按质量分数60%、10%、10%、10%及10%配比,并通过用干垃圾压块料和工业锅炉底渣交错加料的方式解决了中试试验中压块料进料不畅的问题。通过试验发现干垃圾空气气化条件,过量空气系数由0.31提至0.50,气化温度会由850℃提至950℃,生成的煤气热值3976~2590 kJ/m^(3),煤气中CO产率增加,H_(2)产率先增加后减少,CH_(4)产率减少,煤气产气率2.28~3.08 m^(3)/kg,冷煤气效率42.97%~51.01%,碳转化率83.11%~92.45%;在900℃条件系统富氧体积分数由30%升高至50%时,水煤气反应得到强化,煤气有效组分(CO+H_(2)+CH_(4))产率和煤气热值均得到提高,煤气热值5274~7294 kJ/m^(3),煤气产气率1.37~1.93 m^(3)/kg,碳转化率83.32%~81.11%,冷煤气效率55.39%~53.77%;模拟生活干垃圾在中试规模循环流化床气化炉内实现稳定空气气化和富氧-水蒸汽气化运行,炉膛底部温度低,炉膛底部至顶部高度范围内温度分布较为均匀,装置稳定连续运行108 h,温差在19.7℃以内,中试规模循环流化床内部物料循环稳定。 展开更多
关键词 干垃圾 气化 循环流化床 中试 富氧-水蒸气
下载PDF
焦炭-水蒸气催化气化反应特性研究
14
作者 唐瑞源 梁馨文 +3 位作者 张玉玉 张君涛 罗建玲 姚晓莎 《应用化工》 CAS CSCD 北大核心 2024年第1期97-101,共5页
采用碱性待生剂为气化原料,考察焦炭与水蒸气催化气化反应特性。在消除内外扩散影响的前提下,探讨了气化反应温度、进水蒸汽、混合气体比例及气化时间对焦炭水蒸气催化气化反应的影响。结果表明,碱性待生剂上焦炭催化气化反应速率与气... 采用碱性待生剂为气化原料,考察焦炭与水蒸气催化气化反应特性。在消除内外扩散影响的前提下,探讨了气化反应温度、进水蒸汽、混合气体比例及气化时间对焦炭水蒸气催化气化反应的影响。结果表明,碱性待生剂上焦炭催化气化反应速率与气化反应温度成正比,进水蒸汽速率为2.5 L/min时,可基本消除水蒸气的扩散效应对焦炭催化气化反应的影响,碱性待生剂上焦炭转化率基本趋于稳定,气化反应时间30 min,可较好转化碱性待生剂上焦炭,产品气以H_(2)组成为主(含量约60%)。水蒸气/氧气混合气为气化剂可显著提高焦炭催化气化转化率,同时,氧气的加入会影响合成气组成。合成气中H 2和CO含量降低,CO_(2)含量升高。 展开更多
关键词 焦炭 水蒸气 碱性待生剂 催化气化
下载PDF
生活垃圾与燃煤电站烟气蒸汽耦合发电技术简析
15
作者 韦晓丽 冯琰磊 +1 位作者 方鹏 魏辉 《锅炉技术》 北大核心 2024年第5期14-20,71,共8页
为推进煤电机组低碳化改造及生活垃圾高效处理,探讨了燃煤机组与生活垃圾耦合发电的技术路线.在研究分析各种耦合方案的基础上,以750t/d生活垃圾焚烧炉与300MW等级亚临界机组耦合发电为例,针对高温烟气蒸汽汽轮机侧双耦合方案进行了典... 为推进煤电机组低碳化改造及生活垃圾高效处理,探讨了燃煤机组与生活垃圾耦合发电的技术路线.在研究分析各种耦合方案的基础上,以750t/d生活垃圾焚烧炉与300MW等级亚临界机组耦合发电为例,针对高温烟气蒸汽汽轮机侧双耦合方案进行了典型负荷工况的计算,分析了耦合后对燃煤锅炉的影响,并进行了技术经济评估.研究结果表明:该耦合方案在技术上可行,且对燃煤机组的影响可控.与传统垃圾发电相比,此方案使垃圾发电的供电效率提高了10%以上,吨垃圾造价成本降低了约13%.生活垃圾与燃煤电站烟气蒸汽双耦合发电技术能显著提升效率并降低成本,具有低碳、环保、低成本等优点,符合国家产业政策导向. 展开更多
关键词 烟气侧耦合 蒸汽侧耦合 烟气蒸汽双耦合 气化耦合 RDF耦合 技术经济分析
下载PDF
生态环境视域下基层医院医疗废物处理研究
16
作者 王千慧 张建智 《环境科学与管理》 CAS 2024年第3期136-139,共4页
医疗废物含有大量的病毒、致病微生物以及化学药剂等,若直接排放对生态环境污染性大。因此,文章研究一种生态环境视域下基层医院医疗废物处理方法。该方法采用高温高压蒸汽灭菌与热解气化联合技术,对医疗废物进行前处理和深度处理。通... 医疗废物含有大量的病毒、致病微生物以及化学药剂等,若直接排放对生态环境污染性大。因此,文章研究一种生态环境视域下基层医院医疗废物处理方法。该方法采用高温高压蒸汽灭菌与热解气化联合技术,对医疗废物进行前处理和深度处理。通过此法,废物中的病毒、致病微生物及化学药剂得到有效消减。研究结果表明,处理后二噁英含量显著降低,符合国家标准,杀菌率高达90%以上。这不仅验证了联合处理技术的有效性,也显示了对生态环境的保护作用。此方法为基层医院处理医疗废物提供了新的解决方案,有助于减少环境污染,促进生态平衡。 展开更多
关键词 生态环境视域 基层医院 高温高压蒸汽灭菌法 热解气化法
下载PDF
Gasification of Anthracite in a Pilot-Scale CFB Gasifier and Pore Structure Evolution of Gasification Fly Ash during Steam Activation 被引量:1
17
作者 QI Xiaobin YANG Qiyao +3 位作者 ZHAN Yueping SONG Weijian ZHU Zhiping LYU Qinggang 《Journal of Thermal Science》 SCIE EI CAS CSCD 2023年第5期1899-1911,共13页
The poor-reactivity anthracite urgently needs more ways for large-scale and high-quality utilization.Due to the advantage of good fuel adaptability,the circulating fluidized bed(CFB)gasification technology has the pot... The poor-reactivity anthracite urgently needs more ways for large-scale and high-quality utilization.Due to the advantage of good fuel adaptability,the circulating fluidized bed(CFB)gasification technology has the potential of high-quality utilization of anthracite.In this paper,one kind of anthracite from Shanxi province,China,was employed to be gasified in a pilot-scale CFB gasifier.It is found that at the operating temperature of 1049℃and oxygen concentration of 60.75%,the gas with a concentration of combustibles of 66%and a low heating value of 7.93 MJ/m^(3)(at about 25℃and 101.325 kPa)was produced in the CFB gasification process.However,the overall gasification efficiency was not desired because a large amount of gasification fly ash(GFA)escaped and its yield was up to 22%.In this case,the cold gas efficiency was below 48%and the carbon conversion ratio was only 62%.Further analysis reveals that the GFA was featured with a developed pore structure and the specific surface area(S_(BET))reached 277 m^(2)/g.This indicates such GFA has a potential to use as activated carbon(AC)or AC precursor.Basis on this,steam activation experiments of the GFA produced were conducted to investigate the activation characteristics of GFA and thereby to determine its activation potential.Experimental results indicate that increasing temperature sharply accelerated the activation process,while did not impair the maximum activation effect.After activation,the S_(BET)of GFA maximumly increased by 63%,reaching452 m^(2)/g.With the progress of activation,the pore structure of GFA presents a three-stage evolution process:development,dynamic balance,and collapse.Such a process can be divided and quantified according to the carbon loss.In order to achieve an optimal activation of GFA,the carbon loss shall be controlled at~15%.This work provides a new scheme for high-quality utilization of anthracite. 展开更多
关键词 ANTHRACITE CFB gasification fly ash gasification steam activation
原文传递
生物质蒸汽汽化制氢的优势及其特性探究
18
作者 孙毅 王雷 《现代化工》 CAS CSCD 北大核心 2024年第6期20-24,29,共6页
通过汽化剂的种类来确定蒸汽汽化制氢的效果;分析了温度、蒸汽/生物质的质量比(S/B)2种影响因素对生物质蒸汽汽化制氢中气体成分和H_(2)/CO(氢气与一氧化碳的体积分数比)的影响;最后,从催化剂的种类及其改性的角度来分析生物质蒸汽汽化... 通过汽化剂的种类来确定蒸汽汽化制氢的效果;分析了温度、蒸汽/生物质的质量比(S/B)2种影响因素对生物质蒸汽汽化制氢中气体成分和H_(2)/CO(氢气与一氧化碳的体积分数比)的影响;最后,从催化剂的种类及其改性的角度来分析生物质蒸汽汽化效果。结果表明,以水蒸汽为汽化剂的生物质汽化制氢技术的产氢质量较好,而且适当的汽化温度和S/B对生物质蒸汽汽化制氢具有较好的效果,传统的金属催化剂通过改性的方法可以获得更好的催化效果,且尽可能规避了未改性前的不足。 展开更多
关键词 蒸汽汽化 汽化剂 温度 水蒸汽/生物质 催化剂
下载PDF
吸附强化生物质蒸汽重整气化制氢的热力学研究
19
作者 家丽非 秦梦鑫 +2 位作者 邵正日 谢华清 李荣泉 《可再生能源》 CAS CSCD 北大核心 2024年第2期143-150,共8页
文章利用Aspen Plus流程模拟软件对比研究了在不同条件[气化温度、水与生物质中碳的物质的量比(S/C)、反应压力等]下,是否添加CO_(2)吸附剂对生物质蒸汽重整气化制氢的影响。以制取单位体积氢气所需的能耗和物耗为考察指标,利用矩阵分... 文章利用Aspen Plus流程模拟软件对比研究了在不同条件[气化温度、水与生物质中碳的物质的量比(S/C)、反应压力等]下,是否添加CO_(2)吸附剂对生物质蒸汽重整气化制氢的影响。以制取单位体积氢气所需的能耗和物耗为考察指标,利用矩阵分析方法进行优化,得到吸附强化生物质蒸汽重整气化的最佳条件:气化温度为500℃,S/C=2,气化压力为0.1 MPa,在此条件下,氢气产量为1.56 m^(3)/kg,氢气浓度为98.3%,制取单位体积氢气所需的能耗和物耗分别为4.16 MJ/m^(3)和0.64 kg/m^(3)。 展开更多
关键词 生物质 吸附强化 蒸汽气化 氢气
下载PDF
固定床加压熔渣气化过程的仿真模拟
20
作者 鲁思达 谢星 +1 位作者 孟庆珂 何畅 《化学工程》 CAS CSCD 北大核心 2024年第4期64-69,76,共7页
为研究固定床加压熔渣气化炉气化反应过程及最优工艺参数,利用Aspen Plus软件建立固定床加压熔渣气化炉的动力学模型,并利用该模型对内蒙某固定床加压熔渣气化炉进行模拟计算,计算结果与实际生产数据的误差<5%,从而验证该模型的准确... 为研究固定床加压熔渣气化炉气化反应过程及最优工艺参数,利用Aspen Plus软件建立固定床加压熔渣气化炉的动力学模型,并利用该模型对内蒙某固定床加压熔渣气化炉进行模拟计算,计算结果与实际生产数据的误差<5%,从而验证该模型的准确性。在该模型的基础上探讨固定床熔渣气化炉内的组分和温度分布,以及不同操作参数对气化炉性能的影响。结果表明:炉内最高温度为2019℃,在蒸氧喷嘴附近;炉内各反应层所占高度的比例为燃烧层占15%,气化层占25%,干馏+干燥层占60%;随着蒸氧比(蒸汽质量流量∶氧气体积流量)的增加,碳转化率增加,蒸汽分解率下降,当蒸氧比为0.95—1.0时,气化炉性能最优;随着氧煤比(氧气质量流量∶煤质量流量)的增加,碳转化率增加,蒸汽分解率先增加后降低,当氧煤比为0.45—0.46时,气化炉性能也最优。研究结果可为固定床加压熔渣气化炉的设计和操作提供一定的理论依据。 展开更多
关键词 固定床加压熔渣气化 气化模型 反应动力学 蒸氧比 氧煤比
下载PDF
上一页 1 2 19 下一页 到第
使用帮助 返回顶部