Gasification Effect of Metallurgical Coke with CO₂ and H₂O on the Porosity and Macrostrength in the Temperature Range of 1100 to 1500 °C

Abstract

The gasification of metallurgical cokes with CO2 and H2O on their porosity and macrostrength were investigated in the current study. Cokes were reacted with CO2 or H2O in the temperature range of 1100 to 1500 °C. During the reaction, the compositional change of product gases were measured by quadruple mass spectrometry (QMS) for evaluating the gasification rate. Image analysis was carried out to measure the porosity according to the distance from the coke surface. The porosity at the surface of coke gasified with CO2 indicated low values due to its low reactivity, which resulted in the intraparticle reaction to diffuse into the pores at low temperatures while the coke gasified with H2O showed the tendency to react with the coke at the surface. This difference in the reaction behavior can be explained by Thiele modulus. Furthermore, fine powder formation and tensile strength were measured to evaluate macrostrength of cokes. According to the results, the different reaction mode caused an obvious difference in the tendency of macrostrength of the cokes of the same reaction degree. Tensile strength of cokes was strongly affected by their porosity distribution.

Particle Size Distribution Models for Metallurgical Coke Grinding Products

“…Despite the abovementioned importance of coke particle size distribution (PSD), particle size control has not been studied enough. Many fine recycled particles from chipping in crushing processes or waste in the coke oven cause an overproduction of particulate matter and uncontrolled coke size distributions [11][12][13][14][15][16][17][18][19][20][21][22]. Poor coke without quality classification creates disturbances in the sinter plant and the blast furnace operation, producing excess dust, heat losses, inefficient reaction rates, and fluid flow obstruction.…”

Investigation on Gasification Reaction Behavior and Kinetic Analysis of Iron Coke Hot Briquette under Isothermal Conditions

“…CO 2 emission discharged from steel works accounts for 5–7% of the global total, but in China, it is approximately 15% . Admittedly, blast furnace (BF) ironmaking is still the dominant process of hot metal in large‐scale steel production due to its high productivity and efficiency, in spite of severe environmental challenges . During the production process of steel industry, approximately 1.8 t CO 2 is generated per ton of liquid steel, in particular, 80% of which is from BF .…”

Coke Gasification in Blast Furnace Shaft Conditions with H2 and H2O Containing Atmospheres

“…Similar findings have been noted in previous study by Babich et al, [ 21 ] where it was found that the acceleration of mass loss at 1100 °C is not dependable on the coke reactivity. In other studies, reaction rate has also been seen to change substantially at temperatures above ≈1000 °C (1300 K, [ 11 ] 1373–1674 K [ 22 ] ). This happens because the resistance to chemical reaction is weakened in these high‐temperature conditions.…”