Lindsay, JD
1988-1986
LDV Measurements in Simulated Entrained Gasifier Flows
Lindsay, J.D.; Hedman, P.O. and Smith, P.J.
Submitted to AlChE Journal, 1988. 15 pgs. Funded by Morgantown Energy Technology Center.
Entrained-flow gasification of pulverized-coal has the potential to become a competitive source of energy. One near-commercial application of entrained-flow coal gasification that has been receiving considerable attention is the use of an entrained-flow gasifier in an Integrated Gasification Combined Cycle (IGCC) (e.g., 1, 2). In order to better understand and to improve pulverized-coal gasification processes, a large body of gasification data from within a laboratory-scale entrained-flow gasifier has been collected at this laboratory (e.g., 3-7) and applied toward the development of a comprehensive computer model for pulverized-coal reactors (8-10). This paper summarizes a companion study of the flow processes in an isothermal flow facility that simulates the flow characteristics of the entrained-flow coal gasifier.
A laser Doppler-velocimeter (LDV) was used to make measurements of mean and turbulent velocities both at the inlet, and from within the flow chamber. Isothermal air flows were used to isolate the basic flow properties from such complications as density gradients and chemistry-turbulence interactions. This study emphasized the effects of inlet conditions on flow properties within the simulated reactor (e.g., axial velocity decay, location of recirculation zones, turbulence levels). A knowledge of the effect of inlet conditions on flow properties can lead to improved gasifier operating conditions, can assist in the interpretation of in situ chemical species data from the gasifier, and can guide modeling efforts.
Comparison of experimental measurements with predictions made by a specific computer model was a second objective of this study. The model, PCGC-2 (Pulverized-Coal Gasification and Combustion: 2-Dimensional), is a comprehensive code for pulverized-coal and coal-water slurry processes that has been developed at this laboratory (8-10). The code employs the k-e model for turbulent fluid mechanics. Much of the earlier experimental flow data was collected with intrusive probes, which in some cases seriously distorted the flow being measured. Furthermore, most of the earlier studies did no include measurements at the inlet. Documentation of the inlet boundary condition is needed if experimental data are to be properly applied to model development.
LDA Measurements in Simulated Gasifier Flows with Swirl
Lindsay, J.D.; Hedman, P.O. and Smith, P.J.
International Symposium on Laser-Doppler Velocimetry, 1986, Lisbon, Portugal. 6 pgs. Funded by Morgantown Energy Technology Center and US Department of Energy.
A laser-Doppler system was used in a cold-flow study of a simulated pulverized-coal gasifier. The study was designed to provide fundamental information about the behavior of flow in such a gasifier and to provide data for the validation of a computer model. Measurements in 21 flow cases with and without swirl were made. Results are compared with predictions from a comprehensive model that uses a k-e turbulence submodel. Several levels of replication were used in the testing in order to examine reproducibility and to permit statistical analysis of results.
Lindsay, JD
1988-1986
LDV Measurements in Simulated Entrained Gasifier Flows
Lindsay, J.D.; Hedman, P.O. and Smith, P.J.
Submitted to AlChE Journal, 1988. 15 pgs. Funded by Morgantown Energy Technology Center.
Entrained-flow gasification of pulverized-coal has the potential to become a competitive source of energy. One near-commercial application of entrained-flow coal gasification that has been receiving considerable attention is the use of an entrained-flow gasifier in an Integrated Gasification Combined Cycle (IGCC) (e.g., 1, 2). In order to better understand and to improve pulverized-coal gasification processes, a large body of gasification data from within a laboratory-scale entrained-flow gasifier has been collected at this laboratory (e.g., 3-7) and applied toward the development of a comprehensive computer model for pulverized-coal reactors (8-10). This paper summarizes a companion study of the flow processes in an isothermal flow facility that simulates the flow characteristics of the entrained-flow coal gasifier.
A laser Doppler-velocimeter (LDV) was used to make measurements of mean and turbulent velocities both at the inlet, and from within the flow chamber. Isothermal air flows were used to isolate the basic flow properties from such complications as density gradients and chemistry-turbulence interactions. This study emphasized the effects of inlet conditions on flow properties within the simulated reactor (e.g., axial velocity decay, location of recirculation zones, turbulence levels). A knowledge of the effect of inlet conditions on flow properties can lead to improved gasifier operating conditions, can assist in the interpretation of in situ chemical species data from the gasifier, and can guide modeling efforts.
Comparison of experimental measurements with predictions made by a specific computer model was a second objective of this study. The model, PCGC-2 (Pulverized-Coal Gasification and Combustion: 2-Dimensional), is a comprehensive code for pulverized-coal and coal-water slurry processes that has been developed at this laboratory (8-10). The code employs the k-e model for turbulent fluid mechanics. Much of the earlier experimental flow data was collected with intrusive probes, which in some cases seriously distorted the flow being measured. Furthermore, most of the earlier studies did no include measurements at the inlet. Documentation of the inlet boundary condition is needed if experimental data are to be properly applied to model development.
LDA Measurements in Simulated Gasifier Flows with Swirl
Lindsay, J.D.; Hedman, P.O. and Smith, P.J.
International Symposium on Laser-Doppler Velocimetry, 1986, Lisbon, Portugal. 6 pgs. Funded by Morgantown Energy Technology Center and US Department of Energy.
A laser-Doppler system was used in a cold-flow study of a simulated pulverized-coal gasifier. The study was designed to provide fundamental information about the behavior of flow in such a gasifier and to provide data for the validation of a computer model. Measurements in 21 flow cases with and without swirl were made. Results are compared with predictions from a comprehensive model that uses a k-e turbulence submodel. Several levels of replication were used in the testing in order to examine reproducibility and to permit statistical analysis of results.