US2026062620A1PendingUtilityA1
Optimization method for directional preparation technique and efficient use of semi-coke for blast furnace injection
Assignee: UNIV BEIJING SCIENCE & TECHNOLOGYPriority: Jan 28, 2022Filed: Nov 5, 2025Published: Mar 5, 2026
Est. expiryJan 28, 2042(~15.5 yrs left)· nominal 20-yr term from priority
Inventors:ZHANG JIANLIANGLIU ZHENGJIANWANG GUANGWEIXU RUNSHENGJIAO KEXINLI KEJIANGWANG ZHENYANGWANG CUINING XIAOJUN
C10B 57/04C10B 53/04C10B 57/02C10B 57/14
60
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Claims
Abstract
An optimization method for a directional preparation technique and efficient use of semi-coke for blast furnace injection. Firstly, the volatile and the ash content of target semi-coke are preset, and then the volatile and the ash removal percentages of a raw coal are calculated; after ash removal, several sets of dry distillation carbonization temperatures and carbonization times are obtained according to the volatile removal percentage, and the relationships between a combustion rate, abrasiveness, explosiveness and jet flow property and the carbonization temperature are respectively established to obtain the optimal actual carbonization temperature; and semi-coke for blast furnace injection is obtained at an actual carbonization temperature. The directional preparation is suitable for the semi-coke for blast furnace injection, and an optimal coal-compounding scheme is obtained, thus achieving the efficient and safe injection of blast furnace iron-making fuels, and energy conservation and emission reduction.
Claims
exact text as granted — not AI-modifiedWe claim:
1 . An optimization method for efficient use of semi-coke for blast furnace injection, wherein the semi-coke and low-rank coal are mixed to obtain a mixed fuel, the mixed fuel is used for mixed injection, and an optimization method for efficient use of the mixed fuel comprises the following steps:
S 21 . according to cost and combustion performance of the semi-coke and the low-rank coal, obtaining a calculation formula of a cost performance evaluation coefficient of the mixed fuel, as shown in Formula (3):
R
=
Q
low
×
η
(
C
low
-
rank
coal
×
W
low
-
rank
coal
+
C
semi
-
coke
×
W
semi
-
coke
)
+
60
H
mixing
×
C
pulverizing
+
70
I
mixing
×
C
injection
(
3
)
in the formula, Q low represents a low calorific value of the mixed fuel, kJ/kg, η represents a combustion rate of the mixed fuel, C low-rank coal represents a purchase cost of the low-rank coal, RMB/kg, C semi-coke represents a purchase cost of the semi-coke, RMB/kg, W low-rank coal represents a proportion of the low-rank coal, W semi-coke represents a proportion of the semi-coke, H mixing represents a grindability index of the mixed fuel, C pulverizing represents a pulverizing cost per kilogram of standard coal, RMB/kg, I mixing represents a jet flow index of the mixed fuel, and C injection represents a gas delivery cost per kilogram of standard coal, RMB/kg; and
S 22 . taking the cost performance evaluation coefficient obtained in step S 21 as a constraint condition, the greater the cost performance evaluation coefficient, the better the semi-coke blending scheme, and according to this principle, determining a proportion interval of the semi-coke and the low-rank coal in the mixed fuel.
2 . The optimization method for efficient use of semi-coke for blast furnace injection according to claim 1 , wherein the grindability index is calculated by performing a grindability test on the mixed fuel or by Formula (4):
H
mixing
=
H
low
-
rank
coal
×
W
low
-
rank
coal
+
H
semi
-
coke
×
W
semi
-
coke
(
4
)
in the formula, H low-rank coal represents a grindability index of the low-rank coal, and H semi-coke represents a grindability index of the semi-coke; and
the jet flow index is calculated by performing a jet flow test on the mixed fuel or by Formula (5):
I
mixing
=
I
low
-
rank
coal
×
W
low
-
rank
coal
+
I
semi
-
coke
×
W
semi
-
coke
(
5
)
in the formula, I low-rank coal represents a jet flow index of the low-rank coal, and I semi-coke represents a jet flow index of the semi-coke.
3 . The optimization method for efficient use of semi-coke for blast furnace injection according to claim 1 , wherein the low-rank coal comprises, but is not limited to, one or more of bituminous coal, lignite, non-caking coal, weakly caking coal, long flame coal and peat.
4 . The optimization method for efficient use of semi-coke for blast furnace injection according to claim 1 , wherein the optimization method for efficient use of the mixed fuel further comprises: based on the principle that the content of volatile matters in a blast furnace injection fuel is less than 25%, calculating a maximum proportion of the low-rank coal in the mixed fuel according to Formula (6):
W
low
-
rank
coal
=
(
25
%
-
V
semi
-
coke
)
(
V
low
-
rank
coal
-
V
semi
-
coke
)
×
1
0
0
%
(
6
)
in the formula, W low-rank coal represents a proportion percentage of the low-rank coal, V semi-coke represents a content of volatile matters in the semi-coke, and V low-rank coal represents a percentage of volatile matters in the low-rank coal; and
according to the maximum proportion of the low-rank coal, determining an upper limit value of the proportion interval of the low-rank coal and/or a lower limit value of the proportion interval of the semi-coke in step S 22 .
5 . The optimization method for efficient use of semi-coke for blast furnace injection according to claim 4 , wherein the optimization method for efficient use of the mixed fuel further comprises:
in a proportion interval below the upper limit value of the low-rank coal, or in a proportion interval above the lower limit value of the semi-coke, sequentially performing an explosibility test on the mixed fuel composed of the low-rank coal and the semi-coke in proportions corresponding to cost performance evaluation coefficients from high to low; if there is no strong explosibility, determining that this proportion is an optimal blending scheme for the mixed fuel; and if there is strong explosibility, performing an explosibility test on the mixed fuel composed of the low-rank coal and the semi-coke in proportions corresponding to the next group of cost performance evaluation coefficients until the result of the explosibility test shows that there is no strong explosibility, thereby obtaining an optimal blending scheme of the mixed fuel.
6 . The optimization method for efficient use of semi-coke for blast furnace injection according to claim 5 , wherein the no strong explosibility means that the explosibility index≤200 mm.Join the waitlist — get patent alerts
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