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Semester 2

Process Plant Engineering 2 (CHEE08016)

Subject

Chemical Engineering

College

SCE

Credits

10

Normal Year Taken

2

Delivery Session Year

2023/2024

Pre-requisites

Introduction to fluid flow including, steady flow energy equation and friction factors. Introduction to thermodynamics including 1st law, 2nd law and entropy.

Course Summary

This course builds on SCEE08003 Fluid Mechanics 2. It is designed to provide a practical insight into the design of pipework systems, reinforcing theoretical study of fluid mechanics and including the effect of pumps and control valves. It introduces the concept of simple control loops, laying the foundations for future study of control and providing a foundation for compressible flow pressure drop calculations. Compressible flow in nozzles is treated, including choked flow and normal shocks. It introduces the basic concept of corrosion, understanding its harm in chemical engineering plant and learning how to improve materials performance by selection of materials and surface coating. A laboratory and a chemical engineering plant works visit programme supplement the lecture course.

Course Description

This course comprises 20 lectures and 8 tutorials assessed by written examination, as well as one 3 hour laboratory sessions and one process engineering plant works visit. Both laboratory session and works visit are assessed by written reports.LecturesLect 1-6: Objectives and definitions of control loops: controlled, disturbance and manipulated variables, setpoint. Regulator and servo responses. Feedback and feedforward control. Sensors and final control elements. Examples of simple control loops. Control actions: on-off, proportional, PI and PID control. Cascade and split-range control loops.Lect 7-13: Revision of the steady flow energy equation. Evaluation of the friction factor. Types of pipe flow calculations. Frictional losses in pipes and fittings. Example calculations. The operation of positive displacement pumps and centrifugal pumps. NPSH, pump characteristics. Power consumption and efficiency calculations. Pump selection. The operating point. Example calculations. A description of the most common valve types including applications in which they may be appropriately used. Control valves. Design specifications. Valve characteristics. Matching valves to systems. Example of valve choice.Lect 14-18: Revision of compression of gases. Comparison of compressors and liquid pumps. Multistage compression. Efficiencies. Steady flow energy equation for flow of compressible fluids in uniform pipes. Concept of choked flow. Speed of sound. Description and calculation of flow rate and pressure drop correlations for compressible fluids in nozzles. Normal shocks. Examples of compressible flow in nozzles.Lect 19-20: Introduction to eight types of corrosion: uniform, galvanic, crevice, pitting, intergranular, leaching, erosion and stress corrosion cracking. Overview of material selection for corrosive environments. Understand the application of surface engineering to improve materials performance, and in service-life, with reference to coatings for the control of corrosion.Tutorials1. Simple Control Loops2. Simple Processes with control3. Pipework systems without pumps4. Pipework systems with pumps5. Pipework systems with pump and control valve6. Compressors7. Compressible flow8. Corrosion and selection of materialsLaboratoriesStudents complete 1 of the following experiments:1. Characteristics of a Diaphragm Compressor/Vacuum Pump2. Process Control: Regulating the Level in a Process Vessel3. Characteristics of a Centrifugal Blower4. Pressure Relief Devices5. Air Operated Fluid Control Valve: Principles of Construction andOperating Characteristics6. Design of an Orifice Flowmeter7. Pump CharacteristicsWorks visitsStudents go to selected chemical engineering plants for works visit.

Assessment Information

Written Exam 80%, Coursework 20%, Practical Exam 0%

Additional Assessment Information

The written paper, of 2 hours duration, comprises 3 compulsory questions. It should be noted that all aspects of the course are examinable, that questions integrating different aspects of the course can be set and that not all areas of the course need necessarily be examined in any one diet of exams.The School has a 40% Rule for 1st and 2nd year courses, i.e. you must achieve a minimum of 40% in coursework and 40% in written exam components, as well as an overall mark of 40% to pass a course. If you fail a course you will be required to resit it. You are only required to resit components which have been failed.

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