Tar formation characteristic of integrated process of coal pyrolysis with dry reforming of low carbon alkane over Ni/La_(2)O_(3)-ZrO_(2)

Coal pyrolysis integrated with dry reforming of low-carbon alkane(CP-DRA)is an effective way to improve tar yield.Ni/La_(2)O_(3)-ZrO_(2) with a La/Zr ratio of 4 was a good catalyst for DRA to inhibit carbon deposition and obtain high tar yield in CP-DRA.In this study,the fraction distribution and component of tars from CP-DRA and coal pyrolysis in N_(2) atmosphere(CP-N_(2))were characterized by using several methods to understand the effect of DRA on coal pyrolysis.The isotope trace method was also used to discuss the role of low-carbon alkane in CP-DRA.The results showed that the tar from CP-N_(2)is mainly composed of aliphatic compounds with more C_(al),H_(al) and CH+CH_(2),and the tar from CP-DRA contains more Car,Har,and CH_(3),and has lower weight-average molecular weight and more light tar content than CP-N_(2).A small amount of C_(2)H_(6) addition in CP-DRA will raise the ratio of H_(β) and CH+CH_(2).Electron paramagnetic resonance(EPR)analysis shows that the tar from CP-DRA has a higher radical concentration while the corresponding char has a lower radical concentration.The isotope trace experiment showed that alkanes provide·H,·CH_(3),etc.to stabilize the radicals from coal pyrolysis and result in more alkyl aromatic compounds during CP-DRA.

Influence of temperature and Ca(OH)2 on releasing tar and coal gas during lignite coal pyrolysis and char gasification

The yield of tar and syngas has been investigated by catalytic pyrolysis of Pingzhuang lignite(PZL)over Ca(OH)2 catalyst in temperature range of 600℃-1000℃in a tube furnace.The results show that the yield of volatile pyrolysis increases and char decreases with rising temperature for both raw and catalyzed Pingzhuang lignite.The hydrogen fraction(H2)increased from 20%to 40%for the PZL sample;but,for the PZL-Ca(OH)2 sample,H2 fraction fluctuated randomly between 35%to 42%,with the maximum H2 fraction found at 1000℃.The Gaschromatography mass-spectroscopic(GC-MS)analysis revealed that the maximum tar yield at 800℃and 700℃was obtained for PZL and PZL-Ca(OH)2,respectively.The surface morphology of PZL and PZL-Ca(OH)2 chars underwent different transformation in the presence of catalyst as illustrated by SEM/EDX,FTIR,and BET analysis.Furthermore,char sample was investigated for the carbon conversion and reactivity index using TGA analysis under N2 and CO atmosphere.

Hydrocracking of Low-Temperature Coal Tar over CoMo Catalysts Supported on ZrO2-Al2O3 Composite Oxides

A series of CoMo/ZrO2-Al2O3 catalysts with different contents of ZrO2 were prepared and characterized through XRD,XPS,NH3-TPD,H2-TPR,HR-TEM,and N2 adsorption-desorption technologies.The performance of the catalysts for low-temperature coal tar(LTCT)hydrocracking reaction was investigated.The interaction between active metals and Al2O3 was weakened with the introduction of ZrO2,which increased the MoS2 content and the stack layer number of MoS2 slabs to further promote the catalytic performance.At the same time,the amount of acid sites increased with an increasing ZrO2 content.When the ZrO2 content reached 32%,the pore volume of the catalyst decreased significantly.This phenomenon reduced the content of MoS2 and the stack layer number of MoS2 slabs,which were not conducive to improving the catalytic performance.The catalyst containing 24%of ZrO2 exhibited the best catalytic performance for hydrocracking reaction,with the residue conversion and the total yield of gasoline and diesel fractions reaching 60.64%and 66.54%,respectively,which could fulfill the requirements for hydrocracking LTCT.

Fluidized-bed pyrolysis of waste bamboo

Bamboo was a popular material substituting for wood, especially for one-off commodity in China. In order to recover energy and materials from waste bamboo, the basic characteristics of bamboo pyrolysis were studied by a thermogravimetric analyzer. It implied that the reaction began at 190-210℃, and the percentage of solid product deceased from about 25% to 17% when temperature ranged from 400℃ to 700℃. A lab-scale fluidized-bed furnace was setup to research the detailed properties of gaseous, liquid and solid products respectively. When temperature increased from 400℃ to 700℃, the mass percent of solid product decreased from 27% to 17% approximately, while that of syngas rose up from 19% to 35%. When temperature was about 500℃, the percentage of tar reached the top, about 31%. The mass balance of these experiments was about 93%-95%. It indicated that three reactions involved in the process： pyrolysis of exterior bamboo, pyrolysis of interior bamboo and secondary pyrolysis of heavy tar.

Extraordinary Compatibility to Mass Loading and Rate Capability of Hierarchically Porous Carbon Nanorods Electrode Derived from the Waste Tire Pyrolysis Oil

The conversion of waste tire pyrolysis oil(WTPO)into S-doped porous carbon nanorods(labeled as WPCNs)with hierarchical pore structure is realized by a simple template-directed approach.The specific surface area of as-obtained porous carbon nanorods can reach up to 1448 m^(2) g^(−1) without the addition of any activating agent.As the capacitive electrode,WPCNs possess the extraordinary compatibility to capacitance,different electrolyte systems as well as long-term cycle life even at a commercial-level areal mass loading(10 mg cm^(−2)).Besides,only an extremely small capacitance fluctuation is observed under the extreme circumstance(−40 to 80℃),reflecting the excellent high-and low-temperature performance.The relationship between the pore structure and capacitive behavior is analyzed by comparing WPCNs with mesopores-dominated asphalt-derived porous carbon nanorods(APCNs)and micropores-dominated activated carbon.The molecular dynamics simulation further reveals the ion diffusion and transfer ability of the as-prepared carbon materials under different pore size distribution.The total ion flow(NT)of WPCNs calculated by the simulation is obviously larger than APCNs and the N_(T) ratio between them is similar with the experimental average capacitance ratio.Furthermore,this work also provides a valuable strategy to prepare the electrode material with high capacitive energy storage ability through the high value-added utilization of WTPO.

Enhanced near-zero-CO2-emission chemicals-oriented oil production from coal with inherent CO2 recycling: Part I—PRB coal fast pyrolysis coupled with CO2/CH4 reforming

In this study,the Powder River Basin(PRB)coal fast pyrolysis was conducted at 700°C in the atmosphere of syngas produced by CH4-CO2 reforming in two different patterns,including the double reactors pattern(the first reactor is for syngas production and the second is for coal pyrolysis)and double layers pattern(catalyst was at upper layer and coal was at lower layer).Besides,pure gases atmosphere including N2,H2,CO,H2-CO were also tested to investigate the mechanism of the coal pyrolysis under different atmospheres.The pyrolysis products including gas,liquid and char were characterized,the result showed that,compared with the inert atmosphere,the tar yield is improved with the reducing atmospheres,as well as the tar quality.The hydrogen partial pressure is the key point for that improvement.In the atmosphere of H2,the tar yield was increased by 31.3%and the contained BTX(benzene,toluene and xylene)and naphthalene were increased by 27.1%and 133.4%.The double reactors pattern also performed outstandingly,with 25.4%increment of tar yield and 25.0%and 79.4%for the BTX and naphthalene.The double layers pattern is not effective enough due to the low temperature(700°C)in which the Ni-based catalyst was not fully activated.

Low-temperature-pyrolysis preparation of nanostructured graphite towards rapid potassium storage with high initial Coulombic efficiency

Industrially prepared artificial graphite(AG)is attractive for potassium-ion batteries(PIBs),but its rate performance is poor and the production process is energy intensive,so developing an efficient strategy to produce novel graphite with low energy consumption and high performance is economically important.Herein,a nanostructured graphite composed of multi-walled carbon nanotubes(MWCNTs)and graphite shells was prepared by one-pot method through low-temperature pyrolysis of iron-based metal-organic framework(MOF)and carbon source.The high graphitization degree of nanostructured graphite makes the initial Coulombic efficiency(ICE)exceed 80%,and the three-dimensional(3D)conductive network ensures a specific capacity of 234 mAh·g^(−1)after 1000 cycles at a high current density of 500 mA·g^(−1).In addition,the typical graphite potassium storage mechanism is also demonstrated by in situ X-ray diffraction(XRD)and in situ Raman spectroscopy,and its practicality is also proved by the voltage of the full cells.This work provides a feasible way to optimize the practical production process of AG and expand its application in energy storage.

Directional preparation of naphthalene oil-rich tar from Beisu low-rank coal by low-temperature catalytic pyrolysis

Low-rank coal(LRC)can be converted to high value-added naphthalene and its alkylated derivatives through low-temperature catalytic pyrolysis.In this paper,the catalytic pyrolysis of Beisu LRC in a fixed-bed at low temperature was investigated.And the catalytic effects of HZSM-5,low-temperature carbocoal(LtC),and LtC-HZSM-5 on the content and yield of naphthalene oil were examined.The results showed that the generation of naphthalene oil in low-temperature LRC pyrolysis(LT-LP)process could be improved when LtC(prepared at 550℃)or HZSM-5 was individually used as a catalyst.Compared with sole pyrolysis of raw LRC,the addition of the LtC-HZSM-5 catalyst increased the content of naphthalene oil from 11.19 wt.%to 31.49 wt%.And the yield of naphthalene oil was increased from 1.07 wt%to 5.31 wt%.The reactions of micromolecular hydrogen-containing radicals(⋅MHCR)were optimized by LtC.⋅MHCR could be captured in relatively low-temperature region(200-400℃)and released at high temperature by LtC.The generation of phenolics was inhibited by HZSM-5.As a result,the naphthalene oil-rich tar was obtained through low-temperature LtC-HZSM-5 catalytic pyrolysis of Beisu LRC.

Modification mechanism of caking and coking properties of Shenmu subbituminous coal by low-temperature rapid pyrolysis treatment

Shenmu(SM)subbituminous coal without caking property was treated by low-temperature rapid pyrolysis(LTRP)to modify its caking and coking properties.The treated samples were characterized by Fourier transform infrared spectrometry,vitrinite reflectance,and X-ray diffraction to determine the modification mechanism.Moreover,caking index(G)and coking indices(mechanical strength,coke reactivity,and coke strength after reaction)were employed to evaluate caking and coking properties,respectively.The results showed that SM coal was gradually upgraded with increasing processing temperature.Furthermore,the G values for the treated samples were significantly higher than that for SM coal,and G reached the maximum value at 450℃,implying the modification of caking property and the existence of an optimum temperature(450℃).Additionally,laboratory coking determinations showed that LTRP increased the mechanical strength of coke and coke strength after reaction and decreased coke reactivity when the treated coals were used in the coal blends instead of raw SM coal.Overall,LTRP treatment is effective to improve the caking and coking properties of SM coal.A mechanism was proposed for the modification.Suitable upgrading degree with suitable molecular masses and some releasable hydrogen-rich donor species present within the coal,which dominate the development of caking property,is important.

Study on Fractional Separation and GC-MS Analysis of Flash Coal Tar Pyrolysed at Low Temperatures

The composition of low temperature pyrolysis coal tar has an effect on its further processing and reasomble utlization In this paper, the compeition or coal tars produced from both low temperature pyroysis in a fluidized bed aud flash pyrolysis with solid heat carrier have been investigated by the methch of fractional seperation and Gas Chromatography-Mass Spectrometry (GC-MS)- It is observed that the degree of coalification maceral and secondary reaction temperature (freeboard temperature in a fluidized bed) have some iufluence on the composition of coal tars- The main compoundes are phenol cresols,xylenols, naphthalene, alkylnaphthalenes, antbraceue, phenanthrene,acenaphthylene, fluoren, indene and so

富油煤研究进展与趋势

富油煤是集煤、油、气属性于一身的煤基油气资源,针对国内“相对富煤、缺油、少气”的能源禀赋,开发富油煤对缓解我国紧张的油气资源供应局势、实现煤炭的绿色开发和低碳利用具有重要的意义。以富油煤为主要关键词,通过CNKI和Web of Science数据库检索自1985-2023年底已公开发表的学术论文和专利,统计分析富油煤的发展历程和主要研究内容,梳理了富油煤研究的热点方向与前沿领域,展望了未来发展趋势。研究发现:富油煤热解、赋存特征及沉积环境、孔隙和分子结构、焦油产率预测、微生物降解、资源潜力及开发利用是当前富油煤研究热点内容。富油煤含有热解可生成油气的富氢结构,如脂肪结构的侧链与桥键及缩合芳香核周缘的弱键结构;富油煤多形成于陆相沉积物供应稳定、气候温暖湿润、强还原条件下的沉积环境;孔隙结构影响富油煤的热解反应效率、焦油析出和油气运移,而分子结构(主要为脂肪族氢含量和富氢弱键)决定了富油煤的生油潜力;富油煤通过微生物的水解、发酵、产氢产乙酸和产甲烷4个阶段向油气转化。随着地质选区技术瓶颈突破及多学科交叉与融合,富油煤富油性评价指标与预测方法、富氢组分的来源与定量判识、原位开发围岩封闭性及其评价方法、微生物降解与热解联作技术将成为今后研究的热点方向。研究成果为厘清当前富油煤的研究方向和未来走势奠定了基础。

催化剂对煤热解焦油品质的调控及其表面积炭行为的分析

以催化剂为核心和焦油提质为目的的低阶煤热解技术是保障国家能源安全和实现“双碳”目标的煤炭清洁高效转化技术。鉴于煤焦油品质调控和催化剂表面积炭行为的复杂性,阐述了金属、金属氧化物、天然矿物质、分子筛和炭基催化剂对煤和热解挥发物的催化作用及其对热解产物分布和组成的影响,并对比分析了各类催化剂的优缺点。探讨不同催化剂物理化学性质的区别及其与催化性能之间的关系,结合煤及热解挥发物中C—C、C—H、C=C、—OH、C=O、C—O和—COOH等化学键的断键行为,揭示了不同催化剂的作用机制。在此基础上,针对催化过程中存在的焦油产率低及提质效果差的问题,提出了利用金属尤其是过渡金属改性催化剂活化热解体系中的内部小分子氢供体和外部固体/气体氢供体对重质组分裂解碎片原位供氢的方法,实现焦油产率的提高及焦油品质的改善。同时,针对催化剂易积炭失活问题,分析了积炭的物理化学性质和组成以及积炭形成的原因。从催化剂设计及热解反应体系出发,分析了多种有效抑制积炭的途径,如多级孔与金属活性位点的组合效应、双金属改性调控Brønsted和Lewis酸性位点的比例、酸碱双功能催化剂的开发以及引入H_(2)O、CH_(4)、C_(2)H_(6)和CH_(3)OH等富氢小分子调控挥发物组成等,以期为低阶煤催化热解技术的发展提供理论基础。

富油煤原位热解技术战略价值与科学探索

【背景】我国油气需求缺口大、供给制约多、煤炭绿色低碳转型任务艰巨,富油煤作为集煤、油、气属性于一体的煤炭资源,具有立足国内增加油气供给的巨大潜力。【进展】富油煤原位热解技术已在陕西榆林成功实施工程试验,目前仍处于探索阶段。其具备两大战略价值:一是弥补我国油气需求缺口,提高油气自主保障能力;二是变革煤炭开采技术,推动煤炭产业绿色、低碳转型发展。富油煤原位热解包括钻孔式和矿井式两种实践途径,目标是持续高效提取煤中油气资源,主要面临热解选区、加热技术与高效传热传质等难题。【展望】“四性”是原位热解技术研发的关键,包括地质条件适宜性、加热技术匹配性、传热传质有效性和热解安全稳定性。主要内容为:(1)从富油煤资源条件、地层封闭条件、水文地质条件和构造条件等方面阐明适宜富油煤原位热解的地质基础,揭示热辐射范围内围岩封闭动态稳定性的约束条件,为原位热解选址和工程设计提供地质依据。(2)深刻认识富油煤在温度、应力约束下的热物理性质演化行为,基于地质−工程条件论证原位加热技术适宜性,并针对煤层低导热特性开展高效加热工艺设计,通过风、光、电多种供能方式互补实现供热能源经济性。(3)地应力、大尺度煤体、焦油高黏度是制约原位热解油气运移、产出的主要因素,煤层致裂、载热介质优化与温压调控、焦油降黏轻质化是改善煤层传热传质性能和提高热解油气可产出性的潜在方法。(4)原位热解持续稳定运行依赖于全过程监测与动态预警,需要监测手段立体化、地质信息反演精准化、多相多场环境模型化、突变阈值预测预警等技术予以支撑。进一步探索与地质条件相匹配的富油煤原位持续高效热解关键技术,破解煤炭资源开发与地质环境之间的制约矛盾,是推动富油煤原位热解技术深入发展的关键。

黏结性对富油煤热解孔隙结构演变及渗流的影响研究

【目的】富油煤的原位热解是将煤层在地下加热生产油气的技术,其中煤层的孔隙结构和渗透特性是影响加热介质注入和油气产出的重要因素。黏结性富油煤热解伴随胶质体的形成,使其孔隙结构和渗透特性不同于非黏结性煤。【方法】将黏结性富油煤在300、400、500和600℃下热解,采用饱和流体法和氮吸附法测试半焦的孔隙参数,并采用显微CT表征半焦的孔隙结构;通过构建等效孔隙网络模型,分析煤样孔隙数目、孔隙半径和配位数等参数的变化规律,并模拟高温N2在孔隙网络中的渗流特征。【结果和结论】结果表明:煤样经300℃热解后仅产生少量裂隙,总孔隙率维持在约5%;当热解温度为400~600℃时,总孔隙率逐渐增至约50%,而微观孔隙仅在600℃脱气后更为丰富。当热解温度由300℃升至400℃,胶质体的形成、膨胀使孔隙和喉道的数量显著增大,但平均半径分别维持在约160μm和约88μm;再由400℃升至600℃,挥发分的析出促进了孔隙结构的连通,使孔隙和喉道的数量逐渐减少,且概率分布向等效半径更大的范围偏移,使平均半径分别增至292.81μm和170.60μm,并使孔隙平均配位数由5.82分别增至6.60和6.33,孔隙率和配位数的增大使半焦的平均模拟渗透率由246.75μm2显著增至1377.49μm2。研究结果可为黏结性富油煤原位热解的工艺研发提供参考依据。

淖毛湖煤和脱碱木质素共热解挥发物组成分布规律

利用固定床反应器开展了淖毛湖煤和脱碱木质素的共热解实验,并研究了共热解产物的组成和产率变化规律。研究结果表明,共热解会降低半焦产率,促进热解气产率的提升,热解气产率最大提升了33.1%,共热解对于CH_4、CO的生成有明显的促进作用;在煤和木质素混合比例为1∶1时,煤和木质素的热解挥发分间交互作用表现最明显,热解焦油产率表现出正协同作用。在共热解过程中,愈创木酚向单酚、双酚转化,相较于理论计算值,单酚、双酚化合物的含量分别增加了2.9%和9.8%,而愈创木酚的含量降低了5.1%;其原因可能是羰基和羧基的断裂与挥发分间的交互作用增强,抑制了醚类、醛类、酸类化合物的生成,促进了酚类的生成、含氧气体的释放与热解焦油的稳定。木质素的引入,显著促进了煤热解焦油轻质化,焦油中轻质组分比例接近90%。

富油煤原位热解典型污染物时空分布特征

【目的和方法】富油煤原位热解产生的油、气在高温作用下会通过煤层顶板的裂隙带向覆岩层迁移富集,给地下环境造成潜在污染风险。为了了解富油煤地下热解过程中典型污染物的释放与分布特征,以陕北侏罗纪煤田神府矿区典型富油煤为研究对象,基于研究区地层结构与岩性资料,采用自主研发的富油煤原位热解相似模拟实验装置,研究富油煤热解产物的组成,及不同温度下煤焦油中酚油、萘油、洗油、蒽油和沥青等典型污染物的时空分布特征。【结果和结论】结果表明:不同热解温度下,典型污染物在覆岩中的分布随时间增加均呈现先上升后下降的趋势,且各组分含量与富集层位差异较大。热解温度为450℃和650℃下,不同覆岩层中污染物含量大小排序为沥青>蒽油>萘油>洗油>酚油。在450℃时,由于温度较低对覆岩层影响相对较小,所以各组分主要富集在中粒砂岩层。随着温度不断升高,覆岩层产生裂隙,导致650℃时轻质组分富集在距煤层较远的泥岩层,重质组分由于密度大且黏性强,迁移能力较差,所以其主要富集区域为泥质粉砂岩层。温度是影响覆岩中典型污染物时空分布特征的主要因素,升高温度会增加污染物的迁移范围,并且酚油、萘油和洗油含量的占比随之逐渐增大,蒽油和沥青含量的占比随之逐渐减小。研究结果为富油煤原位热解地下污染管控提供理论依据。

耦合富氢小分子催化活化的煤热解提高焦油产率策略与实践

热解作为“工程热化学”的重要研究方向,是实现煤炭分质分级利用的重要途径。提高热解焦油或化学品产率是提升煤转化效率和经济性的关键。煤热解遵循自由基反应机理,因此稳定煤裂解产生的自由基是提高焦油产率的关键。基于煤的热解反应机理及煤中H/C原子比低的特征,本文提出了通过富氢小分子气体的催化活化耦合煤热解提高焦油产率的策略,利用甲烷、乙烷等小分子气体催化活化产生的富氢活性自由基来稳定煤热解产生的自由基,达到抑制煤裂解自由基间的聚合或裂解形成半焦及气体反应的发生,实现热解焦油产率的显著提高。研究表明,甲烷经催化重整或等离子体活化后与煤热解过程耦合,可显著提高焦油产率和一定程度提升焦油品质,该过程具有普适性。甲烷活化方式、催化剂性能、煤种性质等是影响耦合效果的关键因素。同位素示踪证实了富氢小分子自由基参与煤热解焦油的形成。这种富氢小分子气体可拓展至纯甲烷、乙烷、热解煤气等。在此基础上,基于生物质、废塑料、废轮胎等有机固废具有比煤更高H/C原子比及热解过程产生富氢活性物种的特性,发展了煤与生物质、废旧塑料、废轮胎等固体有机物的共热解,发现提高升温速率、改变共热解混合模式等可强化协同作用,实现煤热解焦油产率提高及生物质、废轮胎等资源化高效利用。这种基于小分子气体催化活化耦合传统煤热解技术,为解决现有热解过程存在的焦油产率低等问题提供了重要的思路和方法,为发展先进的煤炭分质分级转化技术提供了新途径。耦合反应器的开发及用于小分子气体活化的高性能催化剂制备是未来研究的重点。

富油煤原位热解地质环境影响与地质保障技术

【目的】富油煤作为一种集煤、油、气为一体的特殊非常规油气资源,通过原位热解可转化为高附加值焦油、可燃气及半焦固体燃料等,具有解决传统煤炭工业发展过程中绿色开发、清洁低碳利用难题的潜力。在减少煤炭开采污染、提高能效利用等方面,为碳达峰碳中和(“双碳”)目标的实现提供了新的解决方案,也为我国寻求油气资源战略依赖突围提供了重要路径参考。然而,目前国内富油煤地下原位热解的研究仅限于少数先导性试验研究,对于富油煤原位热解的地质环境影响研究与全生命周期地质保障技术探索亟待开展。【方法】基于富油煤开发原位热解的地质环境扰动响应特征,重点探讨了富油煤原位热解对热解区岩体变质、覆岩损伤变形、地下水扰动、地表沉降及地表生态环境等方面的影响,总结了富油煤原位热解地质条件评价与过程监测主要内容和测试技术,梳理了富油煤原位热解地质保障面临的挑战。同时,结合理论研究、技术方法、感测装备、传感单元、数据解译、多源信息融合和工程实践等内容认识,提出了构建富油煤原位热解地质保障技术体系的思考。【结果和结论】分析认为,在富油煤原位热解的新型资源转化利用模式条件下,迫切需要研发与之相匹配的地质保障技术,制定完整的开发、设计、施工、评价方法和标准,以规范和引导富油煤热解技术的发展与应用。此外,还需要在充分挖掘和利用富油煤油气资源固有优势的基础上,积极推动富油煤清洁利用技术的研发创新、安全生产标准的提升以及生态环境保护的深度融合,为煤炭工业实现绿色转型和高效可持续发展提供全面的战略对策与保障。

铈改性磁性核壳HZSM-5催化富油煤热解研究

【目的】富油煤是集煤、油气属性为一体的宝贵煤炭资源,催化热解是实现其绿色低碳开发的重要途径。然而,高效可回收催化剂的研发仍面临着极大的挑战。【方法】以HZSM-5@SiO_(2)@MgFe_(2)O_(4)(HSMF)为原料,采用水热法与碱改性制备具有多级孔结构的HZSM-5@SiO_(2)@MgFe_(2)O_(4)(mHSMF),再通过沉淀法制备铈改性mHSMF(5-CeO_(2)/mHSMF);并利用固定床反应器考察了5-CeO_(2)/mHSMF对神府富油煤热解产物的调控作用及其抗积炭性能。【结果和结论】结果表明,CeO_(2)改性有助于在HSMF表面形成微−介孔多级孔道结构;在5-CeO_(2)/mHSMF催化剂上,650℃、N_(2)气氛、反应1 h的条件下,神府富油煤焦油产率达到13.38%,是格金试验焦油产率的176%;相较于原煤热解,催化热解得到的焦油中脂肪烃类及苯类化合物含量分别增加了3.04%和3.07%,煤气中H_(2)和CH_(4)含量提高了10.49%;经CeO_(2)改性后,催化剂的抗积炭性能增幅达86.1%,积炭量仅为11.60 mg/g,且积炭趋于稳定的石墨化结构。5-CeO_(2)/mHSMF对神府富油煤催化热解产物的分布及组成具有明显调控作用,并表现出良好的抗积炭效果和磁性可回收性能。

富油煤煤质特征与原位热解技术开发利用现状

富油煤是保障我国油气资源供给的重要战略资源,充分利用富油煤的油气属性可拓展煤炭的利用方式,有助于减少煤炭直接燃烧利用所带来的环境问题,尤其通过富油煤原位热解技术还可以促进深部煤炭资源的有效利用。以我国富油煤分布特点为基础,分析富油煤的煤岩组成、煤质特征及其对焦油产率的影响,并总结富油煤原位热解技术的开发利用现状。由现有勘探实践表明,我国富油煤资源丰富,其形成和分布受控于构造演化、古气候、沉积环境以及成煤物质来源等因素;大量的测试分析显示,富油煤的焦油产率与煤成因类型、变质程度、煤岩组成、煤质特征有关;富油煤原位热解开发利用是煤炭清洁高效利用的重要途径之一,针对油页岩等其他地质资源开发利用的技术对富油煤适用性有限。为实现富油煤中潜在“油-气”资源的低碳化开发利用,仍需在富油煤资源精细勘查与评价技术、富油煤原位加热与地下体系封闭技术、富油煤中低温热解与热解油气高效抽采技术以及全工艺流程的施工、监测与评估技术等方面加强研究。