Xuantian Li

Xuantian Li
NORAM Engineering and Constructors Ltd. · Industrial Thermochemical Conversion (ITC) Group

Doctor of Philosophy

About

37
Publications
14,429
Reads
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1,241
Citations
Additional affiliations
July 2011 - present
NORAM Engineering and Constructors Ltd.
Position
  • Senior Process Engineer
September 2005 - June 2011
NxtGen Emission Controls, Inc.
Position
  • Manager
October 2002 - August 2005
Membrane Reactor Technologies, Ltd.
Position
  • Senior Researcher

Publications

Publications (37)
Article
Full-text available
A non-stoichiometric equilibrium model based on free energy minimization is developed to predict the performance of gasifiers. The model considers five elements and 44 species in both the gas and solid phases. The gas composition and heating values vary primarily with temperature and the relative abundance of key elements, especially carbon, hydrog...
Article
Full-text available
This paper presents the results from biomass gasification tests in a pilot-scale (6.5-m tall × 0.1-m diameter) air-blown circulating fluidized bed gasifier, and compares them with model predictions. The operating temperature was maintained in the range 700–850°C, while the sawdust feed rate varied from 16 to 45kg/h. Temperature, air ratio, suspensi...
Article
A novel model is presented that incorporates the Arrhenius integral into one of the generalized extreme value (GEV) distributions to describe the pyrolysis of complex feedstocks. The model differs in structure from distributed activation energy models (DAEM), and its self-variable differs from Weibull mixture models. It is found that all first orde...
Article
A kinetic model for prediction of the conversion rate is crucial for research and development of biomass pyrolysis. The complexity of the existing methods for kinetic studies and the diversity in pyrolysis kinetic data largely compromise the application of kinetic models. For the purpose of developing a generalized kinetic model, in this paper, we...
Article
Fly ash produced from incineration of municipal solid wastes (MSW) contains heavy metals, such as Cd and Pb, that make this material difficult to manage and dispose of safely. Because the composition of fly ash is similar to cement raw meal, partial replacement of raw meal with fly ash may be a feasible way to reduce the health and environmental ha...
Article
Full-text available
A proprietary thermochemical process, trade named Emerald Process [1], is being developed for the production of chemical feedstock from Kraft black liquor through fast pyrolysis, catalytic upgrading and separation. The objective of this process is to leverage the harvesting and processing infrastructure of the modern Kraft mill to produce chemical...
Patent
Full-text available
In situations where the demand for syngas is intermittent, a fuel processor is operated to provide a high absolute hydrogen and carbon monoxide production, rather than to give a high fuel-specific hydrogen and carbon monoxide production. When a syngas generator is operated to intermittently produce syngas, a heating process can be performed between...
Patent
Full-text available
In situations where the demand for syngas is prolonged, a fuel processor is operated continuously to provide a syngas stream for a prolonged period. The equivalence ratio of reactants supplied to the fuel processor is controlled so that a high fuel-conversion efficiency to hydrogen and carbon monoxide is obtained at temperatures correspondent to ca...
Patent
Full-text available
The mass flow rate of a first reactant stream supplied to a fuel processor is controlled based on a combined feed-forward and feedback control regime. The method is particularly applicable for actively controlling the fuel supply to a fuel processor in a system comprising a combustion engine, in which the fuel processor is fluidly connected to rece...
Patent
Full-text available
A method of regenerating a particulate filter which traps particulate matter contained in a product stream of a fuel processor. The method comprises a step which predicts the value of a parameter indicative of carbon accumulation in the particulate filter during operation of the fuel processor. When the predicted value meets or exceeds a first thre...
Patent
Full-text available
A fuel processor for producing a hydrogen-containing product stream from a fuel stream and an oxidant stream, comprises a mixing tube from which the combined fuel and oxidant stream is directed substantially axially into a reaction chamber. The reaction chamber comprises a turn-around chamber and a turn-around wall at one end for re-directing the c...
Patent
Full-text available
A system and method for regenerating a device in an engine exhaust after-treatment system is provided. To regenerate the device, a syngas stream is introduced into the engine exhaust stream and combusts in the presence of a catalyst in the after-treatment system, raising the temperature. A supplemental liquid fuel stream is then selectively introdu...
Patent
Full-text available
A fuel processor for producing a hydrogen-containing product stream from a fuel stream and an oxidant stream is actively-cooled by a gaseous or liquid coolant which is directed to flow in contact with at least a portion of the outer shell of the fuel processor. Active cooling can improve the operating characteristics of the fuel processor as well a...
Patent
Full-text available
A method of operating a syngas generator within a desired temperature range, despite a need for intermittent syngas output, involves switching between operating the syngas generator in a rich mode and a lean mode. Operation of the syngas generator in both the rich mode and the lean mode sustains the operating temperature of the syngas generator wit...
Article
Full-text available
Alternatives to UREA Selective Catalytic Reduction are being investigated by most engine manufacturers. A non-catalytic syngas generator allows production of hydrogen and carbon monoxide without the need to modify engine operating conditions. Durability of the syngas generator is enhanced due to the fact that it does not contain any catalyst. The s...
Article
Previous research has shown that hydrogen and carbon monoxide are superior agents for the regeneration and de-sulfation of Lean NOX Traps (LNT). It has also been proposed that a syngas stream could be useful for active regeneration of Diesel Particulate Filters (DPF). The challenge of supplying syngas on-board a vehicle has always been the design a...
Conference Paper
Full-text available
An advanced process featuring CO shift, membrane permeation and in situ CO 2 capture is proposed for enhanced hydrogen production from biomass. Synthesis gas from a circulating fluidized bed gasifier operating at 800-930°C and 8-30 bar, is converted into a hydrogen-rich gas in a shifter at 500-650°C. Simultaneous H 2 permeation and CO 2 removal via...
Article
It has previously been demonstrated that permselective membranes can increase the yields of hydrogen, improve the product quality and minimize or even eliminate the adverse effect of system pressure in catalytic steam methane reforming. At the same time, oxygen addition can lead to autothermal operation by providing some or all of the required endo...
Article
In developing a mathematical model for a CFB boiler we use earlier work. Our model includes mathematical descriptions of the underlying physical and chemical processes. It has been applied to simulation of a 12 MW CFB boiler. The calculations agree well with test results.
Article
This paper mainly studies the separation mechanism of a square cyclone at high inlet solid concentration. It is shown that the separation mechanism is very different from that at low inlet solid concentration. A phenomenon called two-instantaneous separation exists, which has never been found in square cyclone experiments before. This phenomenon ha...
Article
This paper mainly studies the separation mechanism of a square cyclone at high inlet solid concentration. It is shown that the separation mechanism is very different from that at low inlet solid concentration. A phenomenon called two-instantaneous separation exists, which has never been found in square cyclone experiments before. This phenomenon ha...
Article
The dynamic characteristics of sulfur retention by limestone of a 75 t/h circulating fluidized bed (CFB) boiler were obtained through the tests. Based on it, an improved sulfur retention model was developed and integrated into the overall mathematical model of CFB developed earlier by the authors. The model was used to simulate the generation of SO...
Article
Based on experimental system and theoretical model, the effects of water content and humidity, particle size, conversion rate etc. on desulfurization reaction rate of aqueous calcium-based sorbent were both studied. The experimental data and calculated results are helpful to the design of a semi-dry FGD system.
Article
Full-text available
A new system has been developed for clean and highly efficient utilization of coal. The coal is first gasified and the fuel gas is then used for industrial purposes in town gas or as a fuel for gas turbines. The char residue from the gasifier is burned in a circulating fluidized-bed combustor to generate steam for power generation, process heating,...
Article
The experimental results of ignition and burn out characteristics of rice husk in fluidized bed combustion test rig were reported and analyzed. Ignition experiment shows that rice husk can be ignited easily at the lowest temperature of 340 C. Rice husk may be ignited well when fed into fluidized bed at the bed temperature of 400 C, and its devolati...
Article
The technology of WFGD (wet flue gas desulfurization) is used widely for its very high efficiency, but the investment of matured technology is very high. Some normal wastes (seawater, fly ash of power plant, basic waste water, etc) are used for researching WFGD and its corresponding pressure and temperature decrease on packing tower. One technology...
Article
A method based on fractal geometry is suggested to simulate the porous structure of calcined limestone, in which a model similar to the Menger sponge is employed for the porous calcine. The bulk fractal dimension is calculated on the basis of the experimentally obtained pore-size distribution density. The effects of various factors (such as particl...
Article
Due to the environmental pollution and shortage in energy resources, the development of circulating fluidized bed (CFB) combustion has attracted more and more attention, whereas the recycle rate is one of the most important parameters in both the design and operation of the CFB boiler. In this paper, an optimum design method for the CFB boiler was...
Article
A first- and second-law analysis is presented for a process developed for simultaneous generation of a fuel gas and electric power (gas and power cogeneration) based on atmospheric circulating-fluidized-bed (ACFB) combustion of coal. The mathematical model has a zone structure, multi-species equilibrium calculations for applicable zone conditions a...
Article
A mathematical model is developed to evaluate the performance of sulfur retention by limestone in circulating fluidized beds. The model considers particle movement and attrition, calcination and initial pore size distribution, pore plugging and cyclone performance. Percolation scaling theory is used to determine the accessible reaction surface area...
Article
Theoretical and experimental studies were conducted on coal sulphur removal under chaotically changing oxidizing and reducing conditions, which occur in the dense zone of bubbling fluidized beds. Experimental desulphurization trends were analyzed by comparison with multi-species (50 gas-phase, 7 solid-phase species) equilibrium calculations for coa...

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Projects

Projects (2)
Project
A cold model of an industrial solvent recovery unit is built to conduct hydrodynamic study in the column. Gas and liquid tracers are used to study the residence time distributions in both the gas and liquid phases. The work could be extended to include mass transfer study in order to find ways to improve solvent recovery.
Project
Kinetic study of biomass pyrolysis and development of a novel kinetic model based on generalized extreme value (GEV). The eventual goal of this model is to achieve an in-depth understanding of pyrolysis, especially the impact of heating rate, that enables us to predict the yields of individual species from fast pyrolysis of biomass in industrial applications through experimental data obtained from conventional TGA studies with slow heating rates.