Abstract
AbstractThe gas-injection blast furnace (BF) is a new iron-making technology with an injecting gas instead of traditional pulverized coal injection (PCI) and recycling of the BF top gas through a gasifier. In contrast to traditional all-coke and PCI BFs, the coke rate will depend mostly on the heat consumption in a gas-injection BF with abundant injected gas, which results in a large coke-saving potential. Based on energy conservation, carbon recycling, CO2 abatement and fuel cost, the degree of direct reduction should be between 0.2 and 0.3. In addition, in terms of the effects of the gas injected and the rich oxygen rate in the tuyere region, the optimum injection parameters were obtained, which can reduce the coke rate to 273.36 kg/tHM, carbon recycling to 100.72 kg/tHM and abate carbon dioxide emissions by 94.00 Nm3/tHM. Theoretically, the minimum total carbon consumption value is 399.73 kg/tHM. These results illustrate the great potential for carbon recycling and coke saving in gas-injection BFs without increasing total carbon consumption.
Highlights
The energy-intensive iron and steel industry is responsible for approximately 6.7% of the total CO2 emissions globally according to the International Energy Agency [1]
The minimum total carbon consumption value is 399.73 kg/tHM. These results illustrate the great potential for carbon recycling and coke saving in gas-injection blast furnace (BF) without increasing total carbon consumption
The technological process is as follows [23, 24]: The BF top gas is injected into the gasifier as the gasifying agent. → Coal gasification occurs in the gasifier. → H2-rich gas is produced. → H2
Summary
The energy-intensive iron and steel industry is responsible for approximately 6.7% of the total CO2 emissions globally according to the International Energy Agency [1]. The majority of these emissions (over 70%) are produced by ironmaking blast furnaces (BFs), which consume the. The gas-injection BF is a new ironmaking technology that injects gas into tuyeres and recycles the BF top gas through a gasifier, which can provide a new gas source and effectively translate the CO2 in the BF top gas into CO with a lower cost. In contrast to traditional BF with PCI, gas-injection technology can simplify the ironmaking process and recycle the BF top gas, which can contribute to lower emissions and higher productivities. Three scenarios, i.e., a traditional all-coke BF, traditional PCI BF and gas-injection BF, are analyzed, and their energy saving potentials are compared
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