Polygeneration System for Power and Liquid Fuel With Sequential Connection and Partial Conversion Scheme

2009 ◽  
Author(s):  
Hongguang Jin ◽  
Lin Gao
Keyword(s):  
Liquid Fuel ◽  
Gas Production ◽  
Chemical Energy ◽  
Energy Utilization ◽  
Water Gas Shift ◽  
Superior Performance ◽  
Chemical Production ◽  
Polygeneration System ◽  
Water Gas ◽  
New System

As one important direction of clean coal technology with promising prospect, polygeneration system has an attractive performance both in coal liquefaction (or chemical production) and power generation. On the basis of the integration principle of chemical energy cascade utilization, a novel polygeneration system for power and liquid fuel (methanol) production, which innovatively integrates the fresh gas production subsystem without water-gas shift unit and the methanol synthesis subsystem adopting partial-recycle scheme, has been proposed in this paper. Taking another polygeneration system adopting the water-gas shift unit and Once Through Methanol (OTM) scheme as the reference, the new system has been investigated and assessed. The primary energy saving of new system is as high as 15%, which is significantly superior to 5∼8% in the reference system. With special attention on the interactions between the chemical production process and the thermal cycle, the integration features of the new system and the internal reason for its superior performance have been revealed, and the role of chemical energy utilization in system integration has been identified.

Thermodynamic Analysis and Optimization for the Coal-Based Clean Liquid Fuel Synthesis Process

2014 ◽  
Vol 953-954 ◽  
pp. 1269-1272
Author(s):  
Chu Fu Li
Keyword(s):  
Thermodynamic Analysis ◽  
Liquid Fuel ◽  
Coal Gasification ◽  
Maximum Energy ◽  
Water Gas Shift ◽  
Molar Ratio ◽  
Synthesis Process ◽  
Carbon Conversion ◽  
Ft Synthesis ◽  
Water Gas

This work makes thermodynamic analysis and optimization for the coal-based Fischer-Tropsch (FT) process. The thermodynamic analysis results show that under standard conditions the maximum effective carbon conversion is 50% from raw coal (CH0.8O0.1) to hydrocarbon products, and at least 50% carbon is converted into CO2 emission in the coal-based FT process. Subsequently, a new coal-based FT synthesis process is proposed to get minimum water consumption, minimum wastewater emission and maximum energy efficiency. The process contains a pulverized coal gasification unit, water-gas-shift unit and iron-based FT synthesis unit with 50% CO2 selectivity. The H2/CO molar ratio of fresh syngas to the FT synthesis unit is 0.5. The carbon and water footprints analysis results indicate that the effective carbon conversion from raw coal to hydrocarbon products is about 46.0%, and it only consumes 0.102 molar water and generates 0.032 molar wastewater when converts 1 molar coal to hydrocarbon products in the process.

scholarly journals Sorption-Enhanced Water-Gas Shift Reaction for Synthesis Gas Production from Pure CO: Investigation of Sorption Parameters and Reactor Configurations

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 355
Author(s):  
Tabea J. Stadler ◽  
Philipp Barbig ◽  
Julian Kiehl ◽  
Rafael Schulz ◽  
Thomas Klövekorn ◽  
...  
Keyword(s):  
Synthesis Gas ◽  
Catalyst Activity ◽  
Fixed Bed ◽  
Gas Production ◽  
Water Gas Shift ◽  
Parameter Study ◽  
Co2 Removal ◽  
Feed Composition ◽  
Adsorption Sites ◽  
Water Gas

A sorption-enhanced water-gas shift (SEWGS) system providing CO2-free synthesis gas (CO + H2) for jet fuel production from pure CO was studied. The water-gas shift (WGS) reaction was catalyzed by a commercial Cu/ZnO/Al2O3 catalyst and carried out with in-situ CO2 removal on a 20 wt% potassium-promoted hydrotalcite-derived sorbent. Catalyst activity was investigated in a fixed bed tubular reactor. Different sorbent materials and treatments were characterized by CO2 chemisorption among other analysis methods to choose a suitable sorbent. Cyclic breakthrough tests in an isothermal packed bed microchannel reactor (PBMR) were performed at significantly lower modified residence times than those reported in literature. A parameter study gave an insight into the effect of pressure, adsorption feed composition, desorption conditions, as well as reactor configuration on breakthrough delay and adsorbed amount of CO2. Special attention was paid to the steam content. The significance of water during adsorption as well as desorption confirmed the existence of different adsorption sites. Various reactor packing concepts showed that the interaction of relatively fast reaction and relatively slow adsorption kinetics plays a key role in the SEWGS process design at low residence time conditions.

Coupling Experiment of Compact Integrated Fuel Processors with 75kW PEM Fuel Cells

2013 ◽  
Vol 448-453 ◽  
pp. 3066-3072
Author(s):  
Li Ming Du
Keyword(s):  
Fuel Cells ◽  
Liquid Fuel ◽  
Pem Fuel Cells ◽  
Proton Exchange ◽  
Water Gas Shift ◽  
Two Stage ◽  
Fuel Processor ◽  
Water Gas ◽  
Temperature Water ◽  
Coupling Experiment

A compact autothermal reformer suitable for liquid fuel for instance methanol et al. was developed. The fuel reformer was combined with polymer electrolyte membrane fuel cells (PEM FC) and a system test of the process chain was successfully performed. The fuel processor consists of a fuel evaporating step, two-stage reformer and a two-stage reactor of water gas shift (WGS, one for high temperature water gas shift and the other for low temperature water gas shifter) and a four-stage preferential oxidation (PROX) reactor and some internal heat exchanger in order to achieve optimized heat integration. The fuel processor is designed to provide enough hydrogen for 75kWel fuel cells. After the initial step of methanol ATR, CO WGS and CO PROX steps are used for 'clean-up' CO. The exhaust gas from FC anode feedback to the fuel processor to vaporizes the feedstock of methanol and water by a catalytic combusting-evaporator. The hydrogen source system can produce hydrogen 70.5 m3/hr and its specific gravity power and specific volume power reach 255W/kg and 450W/L respectively. During three hours coupling experiment, the fuel processing system and the fuel cells all has been running smoothly. The volume concentration of H2 and CO in product gas (dry basis) was kept in 53% and 20ppm respectively, completely meeting the requirements of PEM fuel cells. The conversion efficiency of the hydrogen producing system based on LHV of fuel and hydrogen can exceed 95.85%. The fuel cells stacks put up strong resistance to CO and its maximum electronic load to the fuel cells reaches 75.5kW. It indicates that it is feasible technically for supplying hydrogen for Proton Exchange Membrane Fuel Cells by catalytic reforming of hydrogen-rich liquid fuel on-board or on-site.

scholarly journals Hydrogen-Rich Gas Production from Steam Gasification of Biomass using CaO and a Fe-Cr Water-Gas Shift Catalyst

BioResources ◽  
2015 ◽  
Vol 10 (2) ◽  
Author(s):  
Qiang Tang ◽  
Haibo Bian ◽  
Jingyu Ran ◽  
Yilin Zhu ◽  
Jiangong Yu ◽  
...  
Keyword(s):  
Gas Production ◽  
Steam Gasification ◽  
Water Gas Shift ◽  
Water Gas ◽  
Shift Catalyst

scholarly journals Syngas Production from Combined Steam Gasification of Biochar and a Sorption-Enhanced Water–Gas Shift Reaction with the Utilization of CO2

Processes ◽  
2019 ◽  
Vol 7 (6) ◽  
pp. 349 ◽  
Author(s):  
Supanida Chimpae ◽  
Suwimol Wongsakulphasatch ◽  
Supawat Vivanpatarakij ◽  
Thongchai Glinrun ◽  
Fasai Wiwatwongwana ◽  
...  
Keyword(s):  
Synthesis Gas ◽  
Gas Production ◽  
Steam Gasification ◽  
Water Gas Shift ◽  
Similar Amount ◽  
Water Gas Shift Reaction ◽  
Syngas Production ◽  
Shift Reaction ◽  
Water Gas ◽  
Gasification Temperature

This research aims at evaluating the performance of a combined system of biochar gasification and a sorption-enhanced water–gas shift reaction (SEWGS) for synthesis gas production. The effects of mangrove-derived biochar gasification temperature, pattern of combined gasification and SEWGS, amount of steam and CO2 added as gasifying agent, and SEWGS temperature were studied in this work. The performances of the combined process were examined in terms of biochar conversion, gaseous product composition, and CO2 emission. The results revealed that the hybrid SEWGS using one-body multi-functional material offered a greater amount of H2 with a similar amount of CO2 emissions when compared with separated sorbent/catalyst material. The gasification temperature of 900 °C provided the highest biochar conversion of ca. 98.7%. Synthesis gas production was found to depend upon the amount of water and CO2 added and SEWGS temperature. Higher amounts of H2 were observed when increasing the amount of water and the temperature of the SEWGS system.

Development and efficient energy utilization of biomass energy based system for renewable hydrogen production and storage

2021 ◽  
pp. 1-27
Author(s):  
Haris Ishaq ◽  
Ibrahim Dincer
Keyword(s):  
Hydrogen Production ◽  
Water Desalination ◽  
Biomass Energy ◽  
Energy Utilization ◽  
Water Gas Shift ◽  
Efficient Energy ◽  
Production Of Hydrogen ◽  
Entrained Flow Gasifier ◽  
Renewable Hydrogen ◽  
Water Gas

Abstract The increasing environmental limits and carbon emissions taxes are making is substantial to develop the efficient systems offering the effective energy utilization. This study proposed a new biomass gasification assisted configuration for renewable hydrogen production system offering efficient energy utilization. A multi-effect desalination system is employed for water desalination which is converted to the steam and fed to the entrained flow gasifier. The integrated heat recovery steam generator recovers the additional heat from the syngas to generate steam using fresh water from the desalination unit. The produced hydrogen is supplied to the multistage compression unit that stores hydrogen at high pressure. Industrial Aspen Plus software V9 version is employed for the simulation under the RK-SOAVE property method. The production of hydrogen before water gas shift reactor is 129.5 mol/s and after the water gas shift reactor is found to be 171 mol/s. The thermodynamic performance of the biomass energy-assisted system is determined through overall energetic and exergetic efficiencies that are revealed to be 40.86% and 38.63%. Numerous sensitivity studies are performance to explore the performance of the designed system and presented and discussed.

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