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Constructal Design of a Converter Steelmaking Procedure Based on Multi-objective Optimization

  • Research Article - Mechanical Engineering
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Abstract

Constructal theory and finite time thermodynamics are introduced into generalized constructal optimization of a converter steelmaking procedure (CSMP) in this paper. A complex function considering molten steel yield (MSY) and useful energy (UE) is taken as the optimization objective. The total raw material cost (TRMC) is fixed. The optimal raw material cost distribution is obtained. The influences of hot metal composition contents, hot metal temperature, steel slag basicity, and price ratio of the waste steel to sinter ore on the optimal performance are analyzed. After optimization, the complex function, the MSY and the UE are improved by 2.67, 2.21 and 3.12%, respectively. Obviously, the performance of the CSMP is improved in certain degree. Decreasing the contents of silicon, phosphorus, manganese and price ratio of the waste steel to sinter ore and increasing the steel slag basicity properly increase complex function. Furthermore, the MCF reaches its twice maximum by optimizing hot metal temperature, the pressure ratio and the relative pressure drop.

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Abbreviations

A :

Area (m\(^{2}\))

a :

Ratio (%)

C :

Cost

c :

Specific heat capacity

D :

Dosage (kg)

\(\tilde{D}\) :

Dimensionless dosage

h :

Specific enthalpy (J/kg)

k :

Weighting coefficient

m :

Mass (kg)

F :

Complex function

P :

Power (W)

p :

Pressure (MPa); price ($)

Q :

Heat (J)

\(Q_\mathrm{elc} \) :

Electricity (J)

q :

Heat value (J/m\(^{3}\))

\(R_{\mathrm{g}} \) :

Gas constant (J/kg K)

T :

Temperature (\(^{\circ }{\hbox {C}}\))

t :

Time (min)

V :

Volume (\(\hbox {Nm}^{3}\))

Y :

Yield (kg)

\(\tilde{Y}\) :

Dimensionless yield

\(\textit{YR}\) :

Element yield rate

\(\gamma \) :

Specific heat ratio

\(\eta \) :

Efficient, rate

\(\tau \) :

Temperature ratio

\(\pi \) :

Pressure ratio

\(\rho \) :

Density (g/m\(^3\))

\(\omega \) :

Content

\(\zeta \) :

Pressure loss coefficient

ac:

Air compressor

air:

Air

bld:

Brayton cycle

bg:

Burnt gas

cg:

Converter gas

ct:

Converter

dol:

Dolomite

eps:

Endpoint molten steel

elc:

Electricity

env:

Environment

FeSi:

Ferrosilicon

FeMn:

Ferromanganese

fines:

Coke fines

gas:

Converter gas

gc:

Gas compressor

hm:

Hot metal

lime:

Lime

oxy:

Oxygen

ore:

Iron ore

slag:

Steel slag

sinter:

Sinter ore

soot:

Soot

st1, st2:

Steam turbine

steam:

Steam

t:

Turbine

water:

Water

ws:

Waste steel

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Authors and Affiliations

  1. Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan, 430033, People’s Republic of China

    Xiong Liu, Huijun Feng & Lingen Chen

  2. Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan, 430033, People’s Republic of China

    Xiong Liu, Huijun Feng & Lingen Chen

  3. College of Power Engineering, Naval University of Engineering, Wuhan, 430033, People’s Republic of China

    Xiong Liu, Huijun Feng & Lingen Chen

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  1. Xiong Liu
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Liu, X., Feng, H. & Chen, L. Constructal Design of a Converter Steelmaking Procedure Based on Multi-objective Optimization. Arab J Sci Eng 43, 5003–5015 (2018). https://doi.org/10.1007/s13369-018-3115-4

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