Effects of Cofiring Coal and Biomass Fuel on the Pulverized Coal Injection Combustion Zone in Blast Furnaces

Gyeong-Min Kim, Jae Hyung Choi, Chung-Hwan Jeon and Dong-Ha Lim
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Gyeong-Min Kim: Green Materials and Processes R&D Group, Korea Institute of Industrial Technology, Ulsan 44413, Korea
Jae Hyung Choi: Green Materials and Processes R&D Group, Korea Institute of Industrial Technology, Ulsan 44413, Korea
Chung-Hwan Jeon: School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
Dong-Ha Lim: Green Materials and Processes R&D Group, Korea Institute of Industrial Technology, Ulsan 44413, Korea

Energies, 2022, vol. 15, issue 2, 1-12

Abstract: CO 2 emissions are a major contributor to global warming. Biomass combustion is one approach to tackling this issue. Biomass is used with coal combustion in thermal power plants or with blast furnaces (BFs) because it is a carbon-neutral fuel; therefore, biomass provides the advantage of reduced CO 2 emissions. To examine the effect of co-firing on pulverized coal injection (PCI) in BFs, two coals of different ranks were blended with the biomass in different proportions, and then their combustion behaviors were examined using a laminar flow reactor (LFR). The PCI combustion primarily functions as a source of heat and CO to supply the upper part of the BF. To create a similar PCI combustion environment, the LFR burner forms a diffusion flat flame with an oxygen concentration of 26% with a flame temperature of ~2000–2250 K at a heating rate of 10 5 K/s. The combustion characteristics, such as the flame structure, burning coal particle temperature, unburned carbon (UBC), and CO and CO 2 emissions were measured to evaluate their effect on PCI combustion. With the increase in the biomass blending ratio, the brightness of the volatile cloud significantly increased, and the particle temperature tended to decrease. The fragmentation phenomenon, which was observed for certain coal samples, decreased with the increase in the biomass blending ratio. In particular, with an increase in the biomass blending ratio, the optimum combustion point occurred, caused by the fragmentation of coal and volatile gas combustion of biomass.

Keywords: laminar flow reactor (LFR); blast furnace (BF); pulverized coal injection (PCI); co-firing; fragmentation; particle temperature; CO/CO 2 emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (1)

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