Fingerprint Abstract This chapter focuses on liquefaction of solids, primarily coal and biomass sources such as lignin. In a twostep process the molecular structure is broken into fragments and hydrogenated, increasing the hydrogentocarbon ratio and preventing retrogressive reactions.
WhatsApp: +86 18838072829There remains an important need for economical coal and biomass to liquids conversion processes with reduced carbon dioxide emissions and efficient use of carbon resources. ... 1—CO 2 carbon capture and conversion to a biological material such as algae; 2—direct coal liquefaction (DCL); 3—indirect conversion of biomass and/or coal to ...
WhatsApp: +86 18838072829Abstract: This chapter focuses on liquefaction of solids, primarily coal and biomass sources such as lignin. In a twostep process the molecular structure is broken into fragments and hydrogenated, increasing the hydrogentocarbon ratio and preventing retrogressive reactions. Solvents solubilize smaller molecular weight components and promote hydrogenation; catalyst improves hydrogenation ...
WhatsApp: +86 18838072829The Energy and Environmental Research Center (EERC), in partnership with the Department of Energy (DOE) and Accelergy Corporation, an advanced fuels developer with technologies exclusively licensed from ExxonMobil, undertook Subtask to design, build, and preliminarily operate a benchscale direct coal liquefaction (DCL) system capable of converting 45 pounds/hour of pulverized, dried ...
WhatsApp: +86 18838072829Direct coal liquefaction (DCL) is a suitable way of producing synthetic fuels from lowrank coals, especially when the wastederived materials are coprocessed during the process.
WhatsApp: +86 18838072829The separate characterization of biomass, coal, and their respective chars aimed at identifying the effect of sodium during different stages of combustion. ... Direct coal liquefaction (DCL) is a main pathway for converting lowrank coals into energy via thermochemical transformation [713], and DCL technology refers to conversion of solid ...
WhatsApp: +86 18838072829Coal Liquefaction Technology and Status ... Coal Conversion Processes Carbonization and Pyrolysis Low severity (mild gasification) High temperature Direct Liquefaction ... Shenhua DCL Process ; Miller EIA 2007 03/28/07 Department of Energy ; 15 ;
WhatsApp: +86 18838072829these biomass resources in one or the other way. With very few exceptions, all conversion processes for biomass produce solid, liquid, and gaseous products in varying yields and composition. Liquefaction could be generally defined as conversion process with the aim to produce liquid products (as primary product and/or with the highest yield).
WhatsApp: +86 18838072829Transcript and Presenter's Notes. Title: Coal Conversion. 1. Coal Conversion Pathwayto Alternate Fuels. C. Lowell Miller. Director, Office of Sequestration, Hydrogen, and. Clean Coal Fuels. Office of Fossil Energy Department of Energy. 2007 EIA Energy Outlook Modeling and Data.
WhatsApp: +86 18838072829There are many liquefaction processes related to DCLS [26], [29], [31], [108], [109]. Several typical or highly referential liquefaction processes that have been reported are selected in this paper for introduction. As an illustration, a flow diagram of coal liquefaction process using syngas was proposed by Fu et al. [29], as shown in Fig. 14.
WhatsApp: +86 18838072829The conversion of coal to products soluble in tetrahydrofuran correlated strongly with the initial rate of gas uptake. The cyclohexane conversion of coal was also catalyzed. ... (DCL) processes and technology for coal and biomass conversion. 2011, 105154. ... A new process for catalytic liquefaction of coal using dispersed MoS2 catalyst ...
WhatsApp: +86 18838072829The results showed the price of coal had a more dominant effect on RSP than that of biomass. Different mix ratios and conversion rates led to RSP ranging from /bbl. LCA results indicated that GHG emissions ranged from kg CO2 eq to kg CO 2 eq/1000 MJ of liquid fuel at various biomass to coal mix ratios and ...
WhatsApp: +86 18838072829The main objective of this paper is to carry out a techno‐economic evaluation for the direct coal liquefaction (DCL) process based on the two primary conversion options under consideration: (a) catalytic coal liquefaction (CCL) the use of non‐donor solvents with added hydrogen pressure and (b) thermal coal liquefaction (TCL) the use of solvents with some H‐donor properties ...
WhatsApp: +86 18838072829In this process, coal with moderate amount of biomass is converted into syncrude through reaction with Hdonor solvent and gaseous hydrogen in a catalytic twostage liquefaction unit.
WhatsApp: +86 18838072829The environmental footprint of coal liquefaction processes can usually be reduced by coprocessing coal and biomass and applying CO 2 capture and storage (CCS) technology but at the cost of higher ...
WhatsApp: +86 18838072829ICL includes two steps; in the first step, coal is converted into syngas ( Coal+H2OCO+H2), and during the last step, syngas is synthesized in the presence of a catalyst into liquid fuels.
WhatsApp: +86 18838072829CoaltoLiquids (CTL) is a technology based on the liquefaction of coal using three basic approaches; pyrolysis, direct coal liquefaction (DCL) and indirect coal liquefaction (ICL) [6] . Historical overview. CTL is an old technique, developed at the beginning of the 20 th century and has recently attracted attention once more.
WhatsApp: +86 18838072829With appropriate product upgrading, synthetic fuels produced from the DCL process can be directly used in the current motor engines. However, similar to other coal liquefaction processes, the DCL process has not been widely commercialized mainly because of economic uncertainty, high CO 2 emission, and high capital cost [1], [2].
WhatsApp: +86 18838072829Other thermochemical conversion technologies are under development for coprocessing biomass and fossil fuels. During the coliquefaction of coal with biomass, lower liquefaction temperature of coal and higher liquid products yield than those predicted by mathematic models are obtained as a result of the synergetic effect.
WhatsApp: +86 18838072829Coal can also be liquefied directly into liquid fuels through direct coal liquefaction (DCL) processes at around 450500 °C under 1530 MPa H 2 in a suitable solvent with appropriate catalysts [2,3,4,5,6,7,8,9]. In many processes, the solvent used can facilitate the heat and mass transfer during chemical reactions, and function as a ...
WhatsApp: +86 18838072829The growing demand for petroleum, accompanied by the declining petroleum reserves and the concerns over energy security, has intensified the interest in direct coal liquefaction (DCL), particularly in countries such as China which is rich in coal resources, but short of petroleum. In addition to a general introduction on the mechanisms and processes of DCL, this paper overviews some recent ...
WhatsApp: +86 18838072829A previous paper has shown that direct coal liquefaction in the absence of a catalyst consists of two distinct stages which are readily ... A kinetic model for the liquefaction processes based on these observations is introduced. ... Direct liquefaction (DCL) processes and technology for coal and biomass conversion. 2011, 105154. https://doi ...
WhatsApp: +86 18838072829Headwaters direct coal liquefaction process. Source: Headwaters. Click to enlarge. Headwaters Inc and Axens are forming a strategic alliance to provide a singlesource solution for producing synthetic fuels by direct coal liquefaction (DCL) alone or in combination with refinery residues or biomass. The two companies will combine their technologies and...
WhatsApp: +86 18838072829To meet future demand in motor fuels, coal will play a key role in areas with large coal resources and lacking crude oils. Axens' direct coal liquefaction (DCL) process is available to produce ...
WhatsApp: +86 18838072829Direct Coal Liquefaction (DCL) commonly refers to catalytic hydrogenation of coal in a recycled oil solvent at high pressures with a catalyst. While a range of process configurations have been proposed, the most common version involves at least two high pressure slurry reactors in a series using a dispersed ironbased catalyst and hydrogen ...
WhatsApp: +86 18838072829The environmental footprint of coal liquefaction processes can usually be reduced by coprocessing coal and biomass and applying CO 2 capture and storage (CCS) technology but at the cost of higher ...
WhatsApp: +86 18838072829Pyrolysis is one of the prospective processes that can be utilized to obtain high value chemicals and energy from coal and biomass. Coalbiomass copyrolysis presents a green, lowrisk, cheap ...
WhatsApp: +86 18838072829The environmental footprint of coal liquefaction processes can usually be reduced by coprocessing coal and biomass and applying CO 2 capture and storage (CCS) technology but at the cost of higher ...
WhatsApp: +86 18838072829Direct liquefaction (DCL) processes and technology for coal and biomass conversion
WhatsApp: +86 18838072829