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Development of a Conceptual Model for Heat Recovery from Exhaust Gases of Electric Arc Furnace

Mehrabi, Mohammad Reza | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48226 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Saboohi, Yadollah
  7. Abstract:
  8. Steel in Iran is mainly produced by EAFs. One of the most fundamental issues in the field of electric arc furnace is to foresight methods to reduce energy consumption and emissions. A model is presented in the present research work that avails itself to analysis of mass and energy recovery simultaneously. The proposed model includes three major elements: scrap pre-heating, sponge iron pre-heating and inert gases pre-heating. An important feature of this approach is to preheat sponge iron. Mathematical model for preheating scrap has been developed on the basis of CONSTEEL technology. Also the model for sponge iron and inert gases preheating has been formulated based on the literature review. The results of scrap preheating systems indicate that for a furnace of 104 tons of scrap charging, 9.8% (37.2 kWh per ton of steel) reduction in electricity consumption and 5.5% reduction in energy consumption of the furnace would be feasible. In the present work the cyclone-separator is used to preheat inert gas. Design of cyclone has been based on 5 cubic meters per second of nitrogen from 20 to 500 ° C, where 10 units of cyclone heat exchanger with internal diameter of 4 m height of 6.8 m are required. With Similar conditions also 10 units of radiative recuperatores with a diameter of 4 meters and a height of 11.25 meters with a Counter flow heat exchanger system are required. The final part of the model simulates the preheating of sponge iron by means of Fluidized bed heat transfer equations. Equations were solved by numerical methods (Backward discretization) in the MATLAB software. The results show that the temperature of charge could be increased up to 177 degrees. This increase in temperature would cause a reduction in energy input. By using the heat recovery systems, it is estimated that 27 percent reduction in energy consumption of electric arc furnace would be feasible
  9. Keywords:
  10. Electric Arc Furnaces ; Heat Recovery Section ; Fluidized Bed ; Sponge Iron Preheating ; Scrap Preheating ; Cyclone-Recuperator Exchenger

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