Waste Heat Recovery & Utilization from furnace flue gas for drying mold: (The Case of G-7 Trading& Industry PLC.)
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Date
2018-11
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Addis Ababa University
Abstract
As energy crisis become increasingly noticeable, the energy consumption has become the main
problem which restricts the sustainable development of industry. The recovery and utilization of
different kinds of waste heat can effectively reduce energy consumption of the company.
Therefore, recovery and utilization of waste heat become very important. Energy saving is one of
the crucial concern, not only from the point of view of fuel consumption but also for the
conservation and protection of global environment. So, it is important that a significant and
great effort should be made for conserving energy from waste heat. Recovering and reusing this
waste heat would provide an attractive opportunity for less costly energy resource. Most industry
use furnace to melt metals and metal scraps for manufacturing spare parts, by doing this they
can reduce cost of buying spare parts for the machine.
However, during combustion process of furnace oil enormous amount of heat energy is wasted to
the environment via chimney which is embedded in the flue gas. The furnace working
temperature is about 1400°C.Based on the measured parameters such as the average
temperature of flue gas at the hood and chimney was about 240°C and 146°C respectively. From
heat transfer analysis calculation, the amount of waste heat obtained from hot flue gas was
about 24.4kw, Hence, the amount of heat is recovered from the flue gas is about 37.6%.
This study aims at providing a flue gas as an alternative energy to dry the mold in the
foundry shop instead of drying by burning of wood. In this study temperature and velocity of
flue gas at different locations were measured and analytical calculation was made on flue gas
supply system and mold drying room. Simulation has been done using Computational Fluid
Dynamics (CFD) Ansys software to show what is going on inside the hot flue gas supply duct
and mold drying room. Tapping hot flue gas from top part of the furnace or chimney and
supplying via duct to drying room to dry the mold will benefit the industry-; by reducing fuel
consumption, saving the cost of the wood by 90%, making economical and environmental
friendly. This will reduce impact of deforestation and create good working environment.
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Keywords
ANSYS (CFD), Chimney, Drying room, Furnace, Flue gas, Heat losses, Molds, Supply duct, Waste Heat Recovery