Design and Analysis of Heat Exchangers for Waste Heat Recovery System

Supervisor: Lt. Col (R) Afzal Bhatti
 

Members:

Rafaqat Amir ME3-2038 , Masood Ali ME3-2010 , Shakeel Ahmed ME3-2055 , Ahsan Ali ME3-2034

Department of Mechanical Engineering

Wah Engineering College

Introduction

The search for alternatives to landfill for the disposal of waste and the threat of climate change, worsened by the burning of fuels, has led to need of the time and resurgence of interest in recovering energy from waste – the recovery of energy in the form of electricity.

Pakistan is presently facing a serious energy crisis and the demand exceeds supply and hence “load-shedding” is a common phenomenon through frequent power shutdowns. There is a need to convalesce the energy in any possible way available.

Our approach in the project is to develop a system through which we can efficiently recover the waste heat from the existing Power Plant of POF and utilise it for producting more electricity.

Methodology

In order to pursue our target for recovering the waste heat, we developed a system which consists of three heat exchangers to be installed in series. Exhaust gases (flow shown in red arrows) in the diagram on the next page, is from V12 Engine, running in counter-flow to the water (flow shown by blue arrows) coming from reservior. The final temperature that is achieved for water is 350 deg C (662 deg F) and it is in superheated form.
The superheated steam is then fed into tubine for power generation.

The process shown in the figure is consisting of following components:

  1. Low Temperature Heat Exchanger
  2. Evaporator
  3. High Temperature Heat Exchanger
  4. Steam Turbine
  5. V12 Engine

There are two fluid circuits i.e.

  1. Exhaust Gases flow circuit
  2. Water flow circuit

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