Modeling and design of turbo generator for waste heat recovery for gbaran-ubie power plan


Price: 2000 Naira (BSC, MSC)




1.1 Background of the Study

The waste heat recovery (WHR) system minimizes energy losses by recovering waste heat generated during power generation. In conventional power generation, the main purpose of a power generation system is to convert fuel or other types of energy into electricity. However, the amount of energy converted from fuel energy to electricity is very small (Kaviri, 2013 and Ku, 2015). The bulk of the fuel energy goes out as exhaust heat or waste heat. To reduce energy loss, the WR system assists in reducing this waste heat loss by using part of the waste heat to produce steam and cooling water. During the operation of a conventional power plant, large amounts of heat in the atmosphere are rejected through cooling circuits or through exhaust gases. Much of this heat can be recovered and used to meet thermal needs, thus increasing the energy efficiency of a power plant from 30–50% to 73–90% of a cogeneration system Can go (Hordsky, 2011 and Dinner, 2011).

The performance evaluation of the WHR system has come to include three functions that are design, off design and transient analysis (Gronstadt, 2000). Several attempts have been made in the past to develop the design and off design behavior of WHR systems keeping in mind the desired results, that is, the types of applications, work outputs, and optimized condition to achieve maximum thermal efficiency and component thermal. Model for predicting the working conditions of heat recovery steam generation (HRSG) elements during the transient start up process. Descombes and Boudigues (Descombes, 2009) studied waste heat recovery with the aim of increasing the availability of combined cycles and cogeneration.

Global warming due to human activities negatively affects the climate and planetary environment. Human activities are actually particularly aggressive emissions known as greenhouse gases that disturb equilibrium in the atmosphere by trapping heat and making the planet warmer. The primary sources of greenhouse gas emissions are industries in general, including power generation and agriculture, transportation and residential sectors.

Public awareness of climate change has forced the governments of all countries to take action to protect the planet. Consuming one-third of total energy use in the world and emitting 30% of total greenhouse gas emissions, the industry sector is at the forefront of this action (ORC waste heat recovery in European energy intensive industries: energy and GHG savings), 2013). Since 1992, the United Nations Framework Convention on Climate Change thus oversees key policies to reduce greenhouse gas emissions worldwide. In 2015, 197 countries agreed on the Paris Agreement aimed at strengthening the global response to the threat of climate change in view of global temperature rise below 2 ° C. (United Nations, 2014).

1.2Objective of the Study

The main objective of this study is to model and design of turbogenerator for waste heat recovery for gbaran-ubie power plant. The specific objective are:

1. To identify the possible areas of gbaran-ubie power plant where energy is available and can be utilized in the process.

2. To design suitable waste heat recovery systems for gbaran-ubie power plant using the possible areas

3. To perform economic analysis of the modified design for gbaran-ubie power plant based on capital investment, coal consumption, water requirement, energy consumption, total profit, payback period, etc.

1.3Significance of the Study

Increased energy efficiency is a constant challenge for industry, energy prices are rising globally so there is a short term necessity to reduce fuel bills in order to remain competitive, which is why waste heat recovery is so important. There is also a prescient environmental issue which cannot be ignored. These are two strong arguments why power generation operators and energy consumers operating hot water or steam boilers ‘without’ waste heat recovery systems in place need to act now. This research will add to the body of knowledge because there is a few literature on this topics.

1.4Scope of the Study

The scope of this study is model and design of turbogenerator for waste heat recovery for gbaran-ubie power plant.

1.5Limitations of the Study

This research is restricted to modeling and design of turbogenerator of waste heat recovery for for gbaran-ubie power plant. In carrying out this research other factors served as constraints: financial limitation, inadequate time

1.6 Definition of Terms

WHRS: Waste Heat Recovery Systems

ICPE:  Internal Combustion Piston Engines

SORC: Supercritical Organic Rankine Cycle

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