Application of Oxygen Enrichment in Hot Stoves and Its Potential Influences on the Energy System at An Integrated Steel Plant

Abstract

The purpose of the presented paper is to investigate oxygen enrichment in hot stoves for an integrated steel plant. The application of oxygen enrichment in hot stoves will lead to lower coke or PCI rate by increased blast temperature. With oxygen enrichment, the high calorific value COG, could be saved while keeping the same blast temperature. Several alternatives of using the saved COG are presented. Furthermore, an analysis of how oxygen enrichment into hot stoves will have influence on the whole energy system has been carried out by means of an optimization model. Different strategies have been suggested to minimize the total energy consumption at the studied steel plant and the nearby CHP plant.

Enhancement of Iron Ore Sinter Reducibility through Coke Oven Gas Injection into the Modern Blast Furnace

“…It has been noticed higher amount and higher heating value of blast furnace top gas could be generated through COG injection into the blast furnace. 16) Although the injection of COG into the blast furnace is practiced in some countries with different injection rate from about 30 to 280 m 3 /tHM but its effect for example on the sinter reducibility is not clear. 9,11,18,19) Furthermore, it was reported that the maximum level of COG injection at the blast furnace tuyere is thought to be 0.1 ton COG/t hot metal according to the thermochemical conditions while the replacement ratio is 0.98 ton of coke/t of COG.…”

Modern blast furnace ironmaking technology: potentials to meet the demand of high hot metal production and lower energy consumption

“…As oxygen enrichment increases, the coke consumption in BF decreases as can be seen in Fig. 3 [21]. Therefore, as the blast temperature and oxygen enrichment increase, the BF efficiency increases, meanwhile the coke consumption and CO2 emission decrease.…”

“…Preparation of hot blast begins by heating the stoves using gas fuel mixture of coke oven gas (COG), natural gas (NG) and BF gas (BFG) [20][21][22]. The hot stove consists of two parts work as combustion and heat exchanger for fuel gases and hot blast.…”

“…Therefore, as the blast temperature and oxygen enrichment increase, the BF efficiency increases, meanwhile the coke consumption and CO2 emission decrease. [21].…”

“…4, were developed and helped the ironmakers to understand many of complex inner phenomena and to work on improving the furnace efficiency [23]. [21].…”