Reactor Model for the Underground Coal Gasification (UCG) Channel

2006 ◽  
Vol 4 (1) ◽  
Author(s):  
Anil N. Khadse ◽  
Mohammed Qayyumi ◽  
Sanjay M. Mahajani ◽  
Preeti Aghalayam
Keyword(s):  
Temperature Profile ◽  
Coal Gasification ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Underground Coal Gasification ◽  
Reactor Model ◽  
Kinetics Parameters ◽  
Transient Model ◽  
Composition Profiles ◽  
Solid Temperature

Underground Coal Gasification (UCG) is the process of in-situ conversion of coal into combustible products (syngas) which can be used either as fuel or as a chemical feedstock. In this study, the gasification channel is viewed as a one-dimensional packed bed reactor. The packed bed reactor model is solved incorporating chemical reactions and mass transfer effects. A pseudo-transient model is simulated for temperature and composition profiles of the gas and solid phases. The movements of the pyrolysis and the reaction front are obtained. The model results are in qualitative agreement with literature. The effects of various operating parameters are studied in detail. Steam/O2 ratio, inlet O2 and total pressure determine the solid temperature profile and hence the outlet gas composition. The simulations are performed for two sets of kinetics parameters. The solid temperature profile and outlet gas compositions change significantly with a change in kinetics parameters. The main motivation behind this study is to provide a theoretical base for understanding the critical aspects of UCG and to provide a tool which coupled with experiments will help in determining the commercial feasibility of the UCG process.

scholarly journals Investigation of thermochemical process of coal particle packed bed reactions for the development of UCG

2020 ◽  
Author(s):  
Tata Sutardi ◽  
Linwei Wang ◽  
Nader Karimi ◽  
Manosh C Paul
Keyword(s):  
Particle Size ◽  
Coal Particle ◽  
Coal Gasification ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Underground Coal Gasification ◽  
Heater Temperature ◽  
Gasification Process ◽  
Coal Particles ◽  
Thermochemical Processes

Abstract In this study, a packed bed reactor is developed to investigate the gasification process of coal particles. The effects of coal particle size and heater temperature of reactor are examined to identify the thermochemical processes through the packed bed. Three different coal samples with varying size, named as A, B, and C, are used, and the experimental results show that the packed bed with smaller coal size has higher temperature, reaching 624oC, 582oC, and 569oC for coal A, B, and C respectively. In the case of CO formation, the smaller particle size has greater products in the unit of mole fraction over the area of generation. However, the variation in the porosity of the packed bed due to different coal particle sizes affects the reactions through the oxygen access. Consequently, the CO formation is least from the coal packed bed formed by the smallest particle size A. A second test with the temperature variations shows that the higher heater temperature promotes the chemical reactions, resulting in the increased gas products. The findings indicate the important role of coal seam porosity in UCG (underground coal gasification) application, as well as temperature to promote the syngas productions.

scholarly journals Investigation of thermochemical process of coal particle packed bed reactions for the development of UCG

2020 ◽  
Vol 7 (3) ◽  
pp. 476-492
Author(s):  
Tata Sutardi ◽  
Linwei Wang ◽  
Nader Karimi ◽  
Manosh C. Paul
Keyword(s):  
Particle Size ◽  
Coal Particle ◽  
Coal Gasification ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Underground Coal Gasification ◽  
Heater Temperature ◽  
Gasification Process ◽  
Coal Particles ◽  
Thermochemical Processes

Abstract In this study, a packed bed reactor was developed to investigate the gasification process of coal particles. The effects of coal particle size and heater temperature of reactor were examined to identify the thermochemical processes through the packed bed. Three different coal samples with varying size, named as A, B, and C, are used, and the experimental results show that the packed bed with smaller coal size has higher temperature, reaching 624 °C, 582 °C, and 569 °C for coal A, B, and C, respectively. In the case of CO formation, the smaller particle size has greater products in the unit of mole fraction over the area of generation. However, the variation in the porosity of the packed bed due to different coal particle sizes affects the reactions through the oxygen access. Consequently, the CO formation is least from the coal packed bed formed by the smallest particle size A. A second test with the temperature variations shows that the higher heater temperature promotes the chemical reactions, resulting in the increased gas products. The findings indicate the important role of coal seam porosity in underground coal gasification application, as well as temperature to promote the syngas productions.

scholarly journals Investigation of thermochemical process of coal particle packed bed reactions for the development of UCG

2020 ◽  
Author(s):  
Tata Sutardi ◽  
Linwei Wang ◽  
Nader Karimi ◽  
Manosh C Paul
Keyword(s):  
Particle Size ◽  
Coal Particle ◽  
Coal Gasification ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Underground Coal Gasification ◽  
Heater Temperature ◽  
Gasification Process ◽  
Coal Particles ◽  
Thermochemical Processes

Abstract In this study, a packed bed reactor is developed to investigate the gasification process of coal particles. The effects of coal particle size and heater temperature of reactor are examined to identify the thermochemical processes through the packed bed. Three different coal samples with varying size, named as A, B, and C, are used, and the experimental results show that the coal packed bed with smaller size has higher temperature, reaching 624oC, 582oC, and 569oC for coal A, B, and C respectively. In the case of CO formation, the smaller particle size has greater products in the unit of mole fraction over the area of generation. However, the variation in the porosity of the coal packed bed due to different particle sizes affects the reactions through the oxygen access. Consequently, the CO formation is least from the coal packed bed formed by the smallest particle size A. A second test with the temperature variations shows that the higher heater temperature promotes the chemical reactions, resulting in the increased gas products. The findings indicate the important role of coal seam porosity in UCG (underground coal gasification) application, as well as temperature to promote the syngas productions.

scholarly journals Investigation of thermochemical process of coal particle packed bed reactions for the development of UCG

2020 ◽  
Author(s):  
Tata Sutardi ◽  
Linwei Wang ◽  
Nader Karimi ◽  
Manosh C Paul
Keyword(s):  
Particle Size ◽  
Coal Particle ◽  
Coal Gasification ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Underground Coal Gasification ◽  
Heater Temperature ◽  
Gasification Process ◽  
Coal Particles ◽  
Thermochemical Processes

Abstract In this study, a packed bed reactor is developed to investigate the gasification process of coal particles. The effects of coal particle size and heater temperature of reactor are examined to identify the thermochemical processes through the packed bed. Three different coal samples with varying size, named as A, B, and C, are used, and the experimental results show that the coal packed bed with smaller size has higher temperature, reaching 624 o C, 582 o C, and 569 o C for coal A, B, and C respectively. In the case of CO formation, the smaller particle size has greater products in the unit of mole fraction over the area of generation. However, the variation in the porosity of the coal packed bed due to different particle sizes affects the reactions through the oxygen access. Consequently, the CO formation is least from the coal packed bed formed by the smallest particle size A. A second test with the temperature variations shows that the higher heater temperature promotes the chemical reactions, resulting in the increased gas products. The findings indicate the important role of coal seam porosity in UCG (underground coal gasification) application, as well as temperature to promote the syngas productions.

Control oriented modeling and optimization of one dimensional packed bed model of underground coal gasification

2014 ◽  
Vol 24 (1) ◽  
pp. 269-277 ◽  
Author(s):  
Ali Arshad Uppal ◽  
Aamer Iqbal Bhatti ◽  
Erum Aamir ◽  
Raza Samar ◽  
Shahid Ahmed Khan
Keyword(s):  
Coal Gasification ◽  
Packed Bed ◽  
Underground Coal Gasification ◽  
One Dimensional ◽  
Modeling And Optimization

scholarly journals Treatment of milk wastewater using up-flow anaerobic packed bed reactor

2015 ◽  
Vol 17 (2) ◽  
pp. 84-88 ◽  
Author(s):  
Kiran D. Bhuyar ◽  
Sanvidhan G. Suke ◽  
S.D. Dawande
Keyword(s):  
Rural Areas ◽  
Biogas Production ◽  
Packed Bed ◽  
Dairy Wastewater ◽  
Packed Bed Reactor ◽  
Reactor Performance ◽  
Reactor Model ◽  
Loading Rates ◽  
Empirical Relations ◽  
Low Costs

Abstract An up-flow anaerobic packed bed (UAPB) bioreactor has been designed on a laboratory-scale and used for treatment of domestic milk wastewater (MWW). The UAPB bioreactor was operated under mesophilic temperature (37-45°C) and reactor performance evaluated at various organic loading rates of MWW effluent at hydraulic retention times (HRT) of 1, 2, and 3 d based on the removal of organic matter COD, BOD, SS, pH changes and biogas production. The kinetic parameters were estimated using the experimental data to develop a reactor model. Empirical relations were generated for the characteristics like COD, BOD, and SS using modeling equations. This study proved that the UAPB reactor performance is excellent for treating domestic MWW and easily biodegradable dairy wastewater influent. Hence, this system can operate at low costs, making it suited for use in the developing countries and rural areas.

scholarly journals Modeling and Simulation of the Hydrogenation ofα-Methylstyrene on Catalytically Active Metal Foams as Tubular Reactor Packing

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Farzad Lali ◽  
Felix-Aron Pahner ◽  
Rüdiger Lange
Keyword(s):  
Bubbly Flow ◽  
Experimental Studies ◽  
Tubular Reactor ◽  
Packed Bed ◽  
Hydrogenation Reaction ◽  
Experimental Results ◽  
Packed Bed Reactor ◽  
Orthogonal Collocation ◽  
Reactor Model ◽  
Catalytically Active

This work presents a one-dimensional reactor model for a tubular reactor packed with a catalytically active foam packing with a pore density of 30 PPI in cocurrent upward flow in the example of hydrogenation reaction ofα-methylstyrene to cumene. This model includes material, enthalpy, and momentum balances as well as continuity equations. The model was solved within the parameter space applied for experimental studies under assumption of a bubbly flow. The method of orthogonal collocation on finite elements was applied. For isothermal and polytropic processes and steady state conditions, axial profiles for concentration, temperature, fluid velocities, pressure, and liquid holdup were computed and the conversions for various gas and liquid flow rates were validated with experimental results. The obtained results were also compared in terms of space time yield and catalytic activity with experimental results and stirred tank and also with random packed bed reactor. The comparison shows that the application of solid foams as reactor packing is advantageous compared to the monolithic honeycombs and random packed beds.

A Scalable Silicon Micro-Reactor for Preferential CO Oxidation With an Integrated Platinum Heater

2005 ◽  
Author(s):  
Amit Dhingra ◽  
Hong G. Im ◽  
Sujit Srinivas ◽  
Erdogan Gulari
Keyword(s):  
Fuel Cell ◽  
Co Oxidation ◽  
Packed Bed ◽  
Critical Issue ◽  
Thermal Design ◽  
Packed Bed Reactor ◽  
Design Parameters ◽  
Reactor Model ◽  
Preferential Co Oxidation ◽  
Micro Reactor

Recent advances in PEM fuel cell systems have demonstrated their role in the production of clean and efficient power. However, due to complexities and safety concerns in the storage and transport of hydrogen, development of on-board fuel processing of hydrocarbon into hydrogen is being considered a critical issue in the success of the fuel cell technology in transportation application. In this paper, a novel concept of scalable silicon micro-reactor with an integrated platinum heater is developed for preferential CO oxidation. The performance of the micro-reactor is assessed and compared to a packed-bed reactor model. Complementary experimental and modeling efforts are made to identify the optimal thermal design parameters. It is demonstrated that the silicon micro-reactors successfully achieves the objectives of scalability without suffering from loss of efficiency due to the mass transfer limitations.

Transient discrete-granule packed-bed reactor model for thermochemical energy storage

2014 ◽  
Vol 117 ◽  
pp. 465-478 ◽  
Author(s):  
Stefan Ströhle ◽  
Andreas Haselbacher ◽  
Zoran R. Jovanovic ◽  
Aldo Steinfeld
Keyword(s):  
Energy Storage ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Reactor Model
Sign in / Sign up

Export Citation Format

Share Document