Introduction
This essay provides a reflective account of a five-week practicum undertaken at a coal-fired power plant, viewed through the lens of a chemical engineering student. The experience bridged theoretical knowledge from university studies with practical applications in industrial settings, focusing on areas such as laboratory analysis, water treatment, and performance optimisation. By outlining the weekly activities, key learnings, and personal reflections, this piece highlights the relevance of chemical engineering principles in power generation, while also addressing limitations encountered and suggestions for improvement. The discussion draws on core concepts like thermodynamics, separation processes, and process control, supported by academic sources, to evaluate how such experiences enhance professional development. Ultimately, this reflection underscores the interplay between technical skills and real-world challenges in ensuring efficient and sustainable energy production.
Week 1: Orientation and Laboratory Introduction
The initial week of the practicum emphasised foundational aspects, including safety protocols and an overview of plant operations. As a trainee, I participated in structured onboarding sessions that covered occupational health and safety standards, which are crucial in high-risk industrial environments (Health and Safety Executive, 2013). These briefings stressed compliance with regulations to mitigate hazards, such as those associated with chemical handling and high-pressure systems. A comprehensive plant tour introduced key components, including the circulating fluidized bed (CFB) combustion system, electrostatic precipitators, water treatment units, and coal handling facilities. This exposure illustrated the integrated process of converting thermal energy from coal combustion into electrical power, while adhering to environmental standards like emission controls (Basu, 2006).
Transitioning to the Unit 1/2 laboratory, I engaged in water quality monitoring, analysing parameters such as pH, conductivity, phosphate, silica, hydrazine, and iron levels. These tests are essential for preventing issues like scaling and corrosion in boilers, which can compromise system efficiency (Flynn, 2009). Techniques involved spectrophotometry and electrochemical measurements, with regular calibration using standard solutions to maintain accuracy. I observed that consistent sampling intervals were vital for reliable data, reinforcing the role of process monitoring in chemical engineering. Additionally, activities like particle size distribution and moisture content analysis of CFB materials provided insights into fluidisation dynamics and combustion efficiency, highlighting how material properties influence heat transfer and overall performance.
Week 2: Deepening Process Knowledge and Coal Analysis
Building on the first week, the second phase delved into process flows and analytical techniques. A lecture on flue gas, feedwater, and steam systems clarified energy conversion mechanisms, including emission controls via cyclone separators and electrostatic precipitators. This aligned with thermodynamic principles, demonstrating heat transfer in steam cycles (Moran et al., 2018). Such knowledge is fundamental in chemical engineering, as it explains how thermal efficiency is achieved in power plants.
I was involved in coal characterisation, starting with Air Dry Loss (ADL) testing to eliminate surface moisture, ensuring precise assessment of intrinsic properties. This preparation, involving sieving and oven drying until constant weight, is critical to avoid distortions in calorific value measurements that could affect combustion (Speight, 2013). Bomb calorimetry followed, determining the heating value of coal samples through controlled combustion and temperature monitoring. Results, combined with analyses of ash, volatile matter, fixed carbon, and sulphur content, evaluated fuel quality and its impact on emissions and efficiency. Participation in safety drills further emphasised regulatory compliance, underscoring that safety is integral to industrial operations (Health and Safety Executive, 2013). These tasks not only applied analytical chemistry but also illustrated the broader implications for plant sustainability.
Week 3: Water Treatment and Engineering Principles
The third week shifted focus to the water treatment facility, where I explored separation technologies and process engineering. Observing filter replacements in the seawater reverse osmosis (SWRO) system and reviewing flow diagrams, I examined five key systems: pre-treatment, desalination, demineralisation, polishing, and wastewater treatment. These processes embody chemical engineering fundamentals, such as mass transfer and fluid flow (Geankoplis, 2003).
The pre-treatment utilised the ACTIFLO system, enhancing coagulation and flocculation with ferric chloride, polymers, and microsand for sedimentation. Reverse osmosis then removed dissolved solids under pressure, producing water for industrial use, followed by ion exchange for demineralised boiler feedwater. Maintaining low conductivity and optimal pH prevented equipment damage, as noted in water chemistry literature (Flynn, 2009). I monitored parameters using SCADA systems, performed backwashing, and adjusted chemical dosing, gaining hands-on experience in real-time control. Exposure to energy recovery and wastewater processes highlighted sustainability efforts, showing how environmental engineering integrates with chemical practices to minimise ecological impact.
Week 4: Building Operational Independence
In the fourth week, I reinforced prior learnings through independent tasks like parameter monitoring and system inspections. This phase promoted accuracy and efficiency, allowing me to internalise system interactions and execute duties more swiftly (arguably a key step in developing professional competence). Discussions on operational challenges, such as maintenance delays and inventory issues, revealed managerial aspects beyond technical roles. Suggestions included preventive maintenance and digital systems to improve efficiency, illustrating that chemical engineering extends to logistical problem-solving.
Auxiliary tasks, like hazardous chemical inventory and SWRO filter replacements, reinforced safety protocols, including PPE usage (Health and Safety Executive, 2013). Overall, this integration period demonstrated growing readiness for advanced responsibilities, blending laboratory and treatment experiences.
Week 5: Data Analysis and Thermodynamic Applications
The final week in the Technical Services Division’s Performance group involved data-driven optimisation. Collecting DCS data on load, emissions, and other parameters, I evaluated plant performance (Moran et al., 2018). Studying modules on flue gas and feedwater systems, I presented on thermodynamic integrations.
Analysing coal parameters like calorific value and grindability informed fuel assessments (Speight, 2013). A highlight was thermodynamic evaluation of the Rankine cycle using steam tables for enthalpy calculations and plotting temperature-enthalpy graphs. Findings showed efficiency drops at reduced loads, aligning with theory (Basu, 2006). This bridged academia and practice, enhancing my analytical skills.
Reflection and Professional Development
Reflecting on the practicum, it effectively linked theoretical concepts from courses like analytical chemistry and thermodynamics to industrial applications, making abstract ideas tangible. However, limitations included a narrow scope for chemical engineering interns, restricting exposure to areas like fuel management. Broader rotations could provide holistic insights (Geankoplis, 2003).
University training prepared me well, though more emphasis on tools like SCADA would help. Suggestions for institutional improvements include earlier industry scouting and partnerships for comprehensive internships. Beyond technical growth, the experience fostered soft skills like communication and adaptability, essential in multidisciplinary settings.
Conclusion
This practicum illuminated the practical dimensions of chemical engineering in power plants, from laboratory analyses to process optimisation, supported by principles of thermodynamics and separation (Moran et al., 2018; Geankoplis, 2003). While valuable, addressing scope limitations could enhance future experiences. Ultimately, it reinforced that effective engineering combines technical expertise with safety, sustainability, and teamwork, preparing students for real-world challenges in energy production. The implications extend to improving educational-industry alignments for better-prepared graduates.
References
- Basu, P. (2006) Combustion and Gasification in Fluidized Beds. CRC Press.
- Flynn, D. (2009) The NALCO Water Handbook. McGraw-Hill Education.
- Geankoplis, C.J. (2003) Transport Processes and Separation Process Principles. Prentice Hall.
- Health and Safety Executive (2013) The Causes and Incidence of Occupational Accidents and Ill-Health Across the Globe. HSE Books.
- Moran, M.J., Shapiro, H.N., Boettner, D.D. and Bailey, M.B. (2018) Fundamentals of Engineering Thermodynamics. John Wiley & Sons.
- Speight, J.G. (2013) The Chemistry and Technology of Coal. CRC Press.
