This research work delves into the fascinating world of simulating and understanding the behavior of coal slurry in thermal pipelines. This groundbreaking book takes you on a journey through the intricate realm of computational modelling, uncovering the key factors and additive effects that influence the flow dynamics of coal slurry.
Through meticulous research and advanced simulations, this book provides a comprehensive exploration of the thermal aspects involved in coal slurry transportation. Gain invaluable insights into the role of additives and their impact on the overall performance of pipeline systems, as you examine the complex interactions between thermal factors, flow rates, and rheological properties.
With a focus on accuracy and precision, this book equips readers with the necessary tools to tackle challenges encountered in the field of thermal pipeline engineering. Explore various computational techniques, numerical methods, and advanced algorithms, empowering you to predict, analyze, and optimize the transport of coal slurry in thermal pipelines.
Whether you are a seasoned researcher, engineer, or a curious enthusiast, "Computational Modelling of Thermal Pipelines" offers a valuable resource for understanding the intricacies of slurry flow and the additive effects in coal transportation. Expand your knowledge, unravel the complexities, and unlock new possibilities in the realm of thermal pipeline systems.
Slurry pipelines are used to transport solid materials using water for short or long distance. These pipelines are used in many industrial application involving transportation of coal and disposal of slurry in thermal power plant. Transportation through slurry pipeline is a safe, pollution free and reliable method. In the present book, rheological properties of bottom and fly ash are studied to know the flow behavior of coal ash slurry. Numerical simulation is performed on the slurry flow through straight pipe and 90° pipe bend for the evaluation of pressure drop per 100 meter length. Modeling of Straight pipe and 90° pipe bend is generated in Gambit version 2.2.30 and Fluent version 6.2.16 is used for the numerical evaluation. Simulation has been performed on various concentrations (10%, 20%, 30%, 40% & 50%), with additive (40% & 50%) for bottom and fly ash slurries at various flow velocities (10, 20, 30, 32, 40, 41m/s).
Contents
1 INTRODUCTION
1.1 COAL ASH
1.1.1 Fly Ash
1.1.2 Bottom Ash
1.2 ASH HANDLING SYSTEM
1.2.1 Bottom Ash Handling System
1.2.2 Fly Ash Handling System
1.3 SLURRY
1.3.1 Non-Settling Slurry
1.3.2 Settling Slurry
1.4 SLURRY TRANSPORTATION SYSTEM
1.5 DIFFERENT TYPES OF LOSSES IN PIPELINE
1.5.1 Losses in Straight Pipe
1.5.2 Losses in Bend
1.6 PIPE MATERIAL
1.7 SURFACTANT
1.7.1 Classification of Surfactant
1.7.2 Triton X-100
1.7.2.1 Benefits of Triton X-100
1.7.2.2 Applications of Triton X-100
2 LITERATURE REVIEW
2.1 LITERATURE REVIEW
2.2 GAPS IN LITERATURE
3 PROBLEM FORMULATION AND OBJECTIVES
3.1 PROBLEM FORMULATION
3.2 OBJECTIVES
4 RHEOLOGICAL CHARACTERISTIC OF BOTTOM AND FLY ASH
4.1 PARTICLE SIZE DISTRIBUTION
4.2 SETTLING PROPERTY
4.3 pH VALUE
4.4 SPECITIC GRAVITY
4.5 RHEOMETER
4.6 GRAPHICAL REPRESENTATION OF PROPERTIES OF BOTTOM AND FLY ASH
5 COMPUTATIONAL SIMULATION OF PIPELINE
5.1 METHODOLOGY
5.1.1 Initial Design
5.1.2 Geometry Generation
5.1.3 Mesh Generation
5.1.4 Pre-Processing
5.1.5 Solver
5.1.6 Postprocessor
5.2 PIPE MODELING
5.3 ASSUMPTION FOR SIMULATION
5.3.1 Boundary Condition
5.3.2 Solution Parameters
5.4 SIMULATION RESULTS OF STRAIGHT PIPE
5.5 PIPE BEND MODELING
5.6 SIMULATION RESULTS OF 90° PIPE BEND
6 CONCLUSION AND FUTURE SCOPE
6.1 CONCLUSIONS
6.2 FUTURE SCOPES
Research Objectives and Focus
This work aims to analyze the rheological behavior and flow characteristics of coal ash slurry (bottom and fly ash) through pipeline systems using computational fluid dynamics (CFD) simulation. The study specifically investigates the impact of solid concentration, flow velocity, and the use of chemical additives (Triton X-100) on pressure drop and overall transportation efficiency in both straight pipes and 90° pipe bends.
- Computational modelling of coal ash slurry flow in industrial pipelines.
- Investigation of rheological properties and the influence of particle size distribution.
- Evaluation of the effectiveness of Triton X-100 as a surfactant to reduce slurry viscosity and pressure drop.
- Comparative analysis of pressure loss profiles in straight pipes versus 90° pipe bends at varying flow velocities and concentrations.
- Optimization of slurry transportation parameters for thermal power plant applications.
Excerpt from the Book
1.5 DIFFERENT TYPES OF LOSSES IN PIPELINE
When fluid flows through a pipe, it is subjected to hydraulic resistances which are of viscous frictional resistance and local resistance. Viscous frictional resistance associated with the fluid flow is called major loss of energy, where as local resistances are called losses of energy. [14] Local resistances are essentially due to change of velocity either in magnitude or direction, in which the portion of energy possessed by the flowing fluid gets dissipated as heat energy. Losses due to change in cross section, bends, valves and frictions of all types are categorized as minor losses. In short pipes, minor losses sometimes are more than the frictional losses. Losses due to the local disturbances of the flow in the conduits such as changes in cross-section, projecting gaskets, elbows, valves and similar items are called minor losses. So, minor losses can be defined as the losses that occur in pipelines due to bends, elbows, joints, valves, etc. In case of a very long pipe, these losses are usually insignificant in comparison to the fluid friction in the length considered. [22]
Summary of Chapters
1 INTRODUCTION: This chapter provides an overview of slurry transportation in thermal power plants, defining key terms such as fly ash, bottom ash, and different slurry types.
2 LITERATURE REVIEW: This chapter summarizes previous research on the rheological behavior of coal-water mixtures and existing gaps in the study of slurry flow in large-diameter, long-distance pipelines.
3 PROBLEM FORMULATION AND OBJECTIVES: This chapter outlines the research problem regarding coal ash transportation and defines the specific research goals of the investigation.
4 RHEOLOGICAL CHARACTERISTIC OF BOTTOM AND FLY ASH: This chapter describes the experimental methodology for determining physical properties like particle size, settling behavior, pH, and viscosity of the coal ashes.
5 COMPUTATIONAL SIMULATION OF PIPELINE: This chapter details the CFD methodology, modelling approach, and simulation results regarding pressure drop in straight pipes and 90° bends under various conditions.
6 CONCLUSION AND FUTURE SCOPE: This chapter presents the final findings on the effect of concentration, velocity, and additives on pressure loss and suggests potential directions for further research.
Keywords
Coal Ash Slurry, Fly Ash, Bottom Ash, Pipeline Transportation, Rheology, Computational Fluid Dynamics, CFD, Pressure Drop, Triton X-100, Surfactant, Viscosity, Pipe Bend, Slurry Modelling, Particle Size Distribution, Industrial Sustainability.
Frequently Asked Questions
What is the primary subject of this book?
The book focuses on the computational modelling of thermal pipeline systems, specifically analyzing how additives like Triton X-100 affect the flow of coal ash slurries.
What are the central thematic areas covered?
The main themes include fluid dynamics in slurries, rheological characterization of power plant waste (fly and bottom ash), and the application of CFD for industrial process optimization.
What is the core research objective?
The primary goal is to evaluate the influence of slurry concentration and flow velocity on pressure drops in transport lines and to demonstrate how chemical additives can optimize these systems.
Which scientific methodology is employed?
The study utilizes both experimental methods to characterize ash properties (via Rheometer and Pyknometer) and computational simulation using software packages such as Gambit and Fluent.
What is covered in the main body of the work?
The main body covers the theoretical background of slurry flow, detailed experimental setup and results for rheology, and comprehensive simulation data for pressure drop in both straight piping and 90° bends.
Which keywords best describe this research?
Key terms include Coal Ash Slurry, CFD Simulation, Pipeline Transportation, Rheology, Pressure Drop, and Surfactant, among others mentioned in the keyword list.
Why are surfactants like Triton X-100 used in this study?
Triton X-100 is used as a surfactant to lower the surface tension of the slurry and decrease its viscosity, which leads to a reduction in the pressure drop required for transportation.
How does concentration affect the slurry behavior?
The study finds that pressure drop increases with higher solid concentrations; furthermore, slurry behavior often transitions from Newtonian to Non-Newtonian characteristics at higher concentrations.
Does the type of pipe fitting impact the results?
Yes, the study specifically examines the differences in pressure drops between straight pipes and 90° pipe bends, finding that pipe bends contribute significantly to local resistance and energy loss.
What are the findings regarding the future scope of this research?
The authors suggest that future work could involve testing similar parameters using different pipe materials, conducting full-scale experimental test loops, and exploring further increments of surfactant dosages.
- Arbeit zitieren
- Subhash Malik (Autor:in), Bikram Jit Singh (Autor:in), 2023, Computational Modelling of Thermal Pipelines. Analysing the Additive Effects in Coal Slurry Flow, München, GRIN Verlag, https://www.grin.com/document/1372508
