الفهرس 
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Abstract
The main purpose of this study are to use the optimum reduction method, find out the main influence factors on reduction process in Suez Steel Company (Direct reduction plant) and determine the best parameters of overall reduction process. Based on the analysis of iron ore composition and properties and how it affects the quality of iron ore based on the product metallization degree and carbon content. The processing of industrial data of HYL ZR process in Suez Steel Company for the period 2013-2014 will be investigate.
In this work the effect of a number of HYL ZR process parameters on direct reduced iron (DRI) quality, during a real process taking place at Suez Steel Company have been studied. These parameters are gas temperature at reactor inlet and at heater outlet, process gas flow rate, oxygen flow rate at partial combustion zone, reducing gases ratio, humidity % in process gas, cooling gas flow rate and natural gas make-up for cooling gas. By changing these parameters, then by determining the DRI quality (degree of metallization and carbon content) after the residence time. It has been found that the metallization degree increases from 79% up to 95% with the increase of gas temperature at reactor inlet and at heater outlet, process gas flow, oxygen flow at partial combustion zone, reducing gases ratio, humidity percent in process gas. Also increasing of cooling gas flow rate and natural gas make-up for cooling gas have cause an increase in the carbon content from 2.2% to 4%.
The processing of industrial data of HYL ZR process in Suez Steel Company for the period 2013-2014 leads to the following conclusions. The quality of DRI is determined by two main properties which are the degree of metallization and carbon content.
A desirable metallization percentage of 94.7% could be realized by applying Temperature of 1093 °C for gas at reactor inlet and 950°C for heater output, Reducing gas ratio (H2/CO) = 5.5 with humidity degree = 6.3%, Gas flow rate of 3*105 Nm3/hr for process gas and 104 Nm3/hr for oxygen in partial combustion, and an acceptable carbon content of about 4% could be attained at the following gas flow rates For cooling gas (mainly CO) it is 8*104 Nm3/hr while for N.G make up (mainly CH4) 6*103 Nm3/hr.