Recent Progress on Hydrogen-Rich Syngas Production from Coal Gasification

Abstract

Coal gasification is recognized as the core technology of clean coal utilization that exhibits significant advantages in hydrogen-rich syngas production and CO2 emission reduction. This review briefly discusses the recent research progress on various coal gasification techniques, including conventional coal gasification (fixed bed, fluidized bed, and entrained bed gasification) and relatively new coal gasification (supercritical water gasification, plasma gasification, chemical-looping gasification, and decoupling gasification) in terms of their gasifiers, process parameters (such as coal type, temperature, pressure, gasification agents, catalysts, etc.), advantages, and challenges. The capacity and potential of hydrogen production through different coal gasification technologies are also systematically analyzed. In this regard, the decoupling gasification technology based on pyrolysis, coal char–CO2 gasification, and CO shift reaction shows remarkable features in improving comprehensive utilization of coal, low-energy capture and conversion of CO2, as well as efficient hydrogen production. As the key unit of decoupling gasification, this work also reviews recent research advances (2019–2023) in coal char–CO2 gasification, the influence of different factors such as coal type, gasification agent composition, temperature, pressure, particle size, and catalyst on the char–CO2 gasification performance are studied, and its reaction kinetics are also outlined. This review serves as guidance for further excavating the potential of gasification technology in promoting clean fuel production and mitigating greenhouse gas emissions.

Fluid Dynamics Investigation in a Cold Flow Model of Internal Recycle Quadruple Fluidized Bed Coal Pyrolyzer

“…It can be seen clearly in Figure 10 that the solid particles in the high-speed bed enter the low-speed bed from the connecting hole in the upper part of the high-speed bed, while the solid particles in the low-speed bed enter the high-speed bed from the connecting hole in the lower part of the low-speed bed, which shows that the internal recycling is achieved between the two beds. Moreover, there are several flow vortexes formed in the beds, which can enhance mass transfer between the gas phase and the solid phase [44,45].…”

Dense and Uniform Integration of Cu-BDC Particles on a Nafion Film for a High-Performance Hydrogen-Producing Device

“…3 Several existing methods for hydrogen production, such as coal gasification, steam reforming, and water electrolysis, have been employed. 4 However, the utilization of electrocatalysts to stimulate the hydrogen evolution reaction (HER) has been identified as a particularly efficient methodology for prospective hydrogen production, primarily because of its low reaction environment requirement (room temperature), environmentally friendly hydrogen source (i.e., water), and easy separation of the products (hydrogen and oxygen are produced at different electrodes). 4,5 Electrocatalysts that exhibit high activity and low HER overpotential are crucial for enhancing the sluggish HER kinetics.…”

“…In response to the pressing need to address the energy crisis and the severity of environmental issues, researchers have been actively engaged in the investigation of clean and sustainable energy resources that can substitute conventional fossil fuels. , Owing to its zero carbon emissions and considerable energy density, hydrogen is universally acknowledged as a promising new energy source poised to accommodate the escalating demand for energy . Several existing methods for hydrogen production, such as coal gasification, steam reforming, and water electrolysis, have been employed . However, the utilization of electrocatalysts to stimulate the hydrogen evolution reaction (HER) has been identified as a particularly efficient methodology for prospective hydrogen production, primarily because of its low reaction environment requirement (room temperature), environmentally friendly hydrogen source (i.e., water), and easy separation of the products (hydrogen and oxygen are produced at different electrodes). , Electrocatalysts that exhibit high activity and low HER overpotential are crucial for enhancing the sluggish HER kinetics .…”

“…Several existing methods for hydrogen production, such as coal gasification, steam reforming, and water electrolysis, have been employed . However, the utilization of electrocatalysts to stimulate the hydrogen evolution reaction (HER) has been identified as a particularly efficient methodology for prospective hydrogen production, primarily because of its low reaction environment requirement (room temperature), environmentally friendly hydrogen source (i.e., water), and easy separation of the products (hydrogen and oxygen are produced at different electrodes). , Electrocatalysts that exhibit high activity and low HER overpotential are crucial for enhancing the sluggish HER kinetics . Up to this point, the Pt-group precious metals have been identified as the most efficient HER electrocatalysts, demonstrating negligible overpotential in acidic solutions. , Nevertheless, their scarcity and high cost pose significant limitations on their widespread commercial application.…”

Mathematical Modeling for the Process of Smelting Reduction Ironmaking Integrated with Hydrogen-Rich Coal Gasification

“…Long-term production practices in the coal chemical industries have demonstrated that coal gasification is pivotal for improving economic efficiency and reducing environmental pollution. On the other hand, most current coal gasification processes yield syngas with relatively low effective gas content (Hydrogen, H 2 and Carbon monoxide, CO), especially the H 2 content [3][4][5][6]. For example, Lurgi and British Gas Lurgi are two representative commercialized coal gasification technologies.…”