Measurement of Carbon Concentration and Dissolution Ratio in Molten Steel by the Mixing Conditions of Carbon Materials Using Coffee Grounds

Gyu-Wan Kim; Geun-Yong Ryu; Sun-Joong Kim

doi:10.7844/kirr.2021.30.1.77

All Issue

2021 Vol.30, Issue 1 Preview Page Next Page

Research Paper

Measurement of Carbon Concentration and Dissolution Ratio in Molten Steel by the Mixing Conditions of Carbon Materials Using Coffee Grounds 커피박을 활용한 탄재 혼합 조건에 따른 용강 내 탄소의 농도 및 용해 효율 측정

28 February 2021. pp. 77-82

PDF XML

Abstract

Reduction of CO₂ emissions is an important issue in the steel industry, and the research on carbon materials that can partially replace cokes is necessary to reduce CO₂ emissions. Meanwhile, the biomass fuel contains some fixed carbon, and the carbon content in the biomass can be increased by torrefaction. As one of the biomass fuels, coffee grounds contains about 55 mass% of carbon, and its about 270,000 tons are landfilled and incinerated annually in Korea. In addition, research on the recycling process due to the increase in annual coffee consumption is required. In this study, the effect of temperature on the concentration of fixed carbon in coffee grounds was investigated during torrefaction. Moreover, the effects of mixing ratio of torrefied coffee grounds with cokes on the carbon concentration and dissolution efficiency in the metal sample were investigated.

Keywords

Coffee grounds

Steel making

Recycling

CO₂ emissions

철강 산업에 있어서 CO₂ 배출량 감소는 중요한 이슈이며, CO₂ 배출 감소를 위해 코크스를 일부 대체할 수 있는 탄재 연료의 연구는 필요하다. 한편, 바이오매스 연료는 고정 탄소를 일부 함유하고 있으며, 반탄화 공정을 통해 연료내 탄소의 함량을 증가시킬 수 있다. 바이오매스 연료 중 커피박은 약 55 mass%의 탄소를 함유하고 있으며, 국내에서 연간 약 27만 ton이 매립 또는 소각되고 있다. 또한, 연간 커피 소비량의 증가로 인한 재활용 공정에 관한 연구가 필요하다. 본 연구에서는 반탄화 공정을 통한 커피박 내 고정 탄소의 농도에 미치는 온도의 영향을 연구하였다. 또한, 반탄화 커피박의 용해 실험을 통해 금속 샘플 내 탄소 농도와 용해 효율에 대한 코크스와 혼합비의 영향을 조사하였다.

키워드

커피박

제강 공정

재활용

CO₂ 배출

References

NASA GISS/Gavin schmidt: Giss Surface Temperature Analysis, Data. Giss.

C. Figures, C.L. Quere, A. Mahindra, et al., 2018 : Emissions are still rising: ramp up the cuts, Nature, 564, pp.27-30. 10.1038/d41586-018-07585-630518903

T.Y. Jin, G.Y. Choi, E.M. Lee, et al., 2020 : A Decomposition Analysis of Domestic Carbon Dioxide Emissions Related to Industry Structure and Energy Mix in Korea, Journal of Environmental Policy and Administration, 28(2), pp.153-182. 10.15301/jepa.2020.28.2.153

C. Xu, D. Cang, 2010 : A brief overview of low CO₂ emission technologies for iron and steel making, Journal of Iron and Steel Research International, 17(3), pp.1-7. 10.1016/S1006-706X(10)60064-7

T. Echterhof, 2021 : Review on the Use of Alternative Carbon Sources in EAF Steelmaking, Metals, 11, pp.222-237. 10.3390/met11020222

K.-H. Yoon, K.-H. Kim, Y.-K. Lee, 1997 : Method of Estimation and Characterization for Coke heat Quantities of Coking coal, Journal of the Korean Institute of Chemical Engineers, 35(4), pp.585-589.

G.-W. Kim and S.-J. Kim, 2019 : Influence of charging condition of Al-dross on maximum concentration of Al in molten steel : Fundamental study for improvement of chemical energy in EAF process, Journal of Korean Institute of Resources Recycling, 28(4), pp.44-50.

M. W. Chapman, B. J. Monaghan, S. A. Nightingale, et al., 2008 : Formation of a Mineral Layer during Coke Dissolution into Liquid Iron and Its Influence on the Kinetics of coke dissolution rate, Metallurgical and Material Transaction B, 39, pp.418-430. 10.1007/s11663-008-9145-7

S.I. Mussatto, L.M. Carneiro, J.P.A. Silva, et al., 2011 : A study on chemical constituents and sugars extraction from spent coffee grounds, Carbohydrate Polymers, 83, pp.368-374. 10.1016/j.carbpol.2010.07.063

G. Nam, M.-S. Kim, J.-W. Ahn, 2017 : Analyses for Current Research Status for the Coffee By-product and for Status of Coffee Wastes in Seoul, Journal of Energy Engineering, 26(4), pp.14-22.

M.-S. Kim, N.-I Koo, J.-G. Kim, 2012 : Characteristics and recycling of spent coffee grounds, Life Science and Natural Resources Research, 20, pp.59-69.

W.-J. Lee, 2015 : Study on Torrefaction Characteristics of Solid Biomass Fuel and Its Combustion Behavior, Journal of Korea Organic Resource Recycling Association, 23(4), pp.59-94. 10.17137/korrae.2015.23.4.086

G. Cruz, I. Avila, P. M. Crnkovic, 2012 : Effects of torrefacation on biomass: a thermal and morphological evaluation, Proc. of 14th Brazilian Congress of Thermal Sciences and Engineering, pp.18-22, Rio de Janeiro, RJ Brazil.

Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 30
No :1
Pages :77-82
Received Date : 2021-01-12
Revised Date : 2021-02-15
Accepted Date : 2021-02-18
DOI :https://doi.org/10.7844/kirr.2021.30.1.77

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

All Issue