US 2026/0168451 A1 · COMBUSTION CONTROL METHOD AND COMBUSTION CONTROL DEVICE FOR HOT BLAST STOVE

Abstract

A combustion control method for a hot blast stove including a combustion step of storing, in a regenerator, a quantity of heat input by combusting a mixed gas, and a blast sending step of generating hot blast by supplying cold blast into the regenerator and supplying the generated hot blast to a blast furnace includes the steps of: calculating an actual value of the quantity of heat; calculating a quantity of heat deprived of by the generation of the hot blast; calculating an actual value of thermal efficiency of the hot blast stove; calculating a quantity of heat to be input when hot blast is generated next time; calculating a quantity of the mixed gas to be supplied when hot blast is generated next time; and controlling the hot blast stove based on the calculated quantity of the mixed gas.

Claims6

Dependent claims

-4. (canceled)

A combustion control method for a hot blast stove having a combustion step of storing, in a regenerator, a quantity of heat input by combusting a mixed gas, and a blast sending step of generating hot blast by supplying cold blast into the regenerator and supplying the generated hot blast to a blast furnace, the combustion control method comprising the steps of:

calculating an actual value of the quantity of heat as an actual quantity of heat input Qin by using the following Equation (1);
calculating a quantity of heat deprived of by generating the hot blast as an actual quantity of heat output Qout by using the following Equation (2);
calculating an actual value of thermal efficiency of the hot blast stove as an actual thermal efficiency η by using the following Equation (3);
calculating a quantity of heat to be input when hot blast is generated next time as a required quantity of heat input QinHS by using the following Equation (4);
calculating a quantity of the mixed gas VM_B to be supplied when the hot blast is generated next time by using the following Equation (5);
and
controlling the hot blast stove based on the calculated quantity of the mixed gas VM_B.
Q
in
=
∑
t
A
⁢
(
k
M
×
V
M
+
T
AIR
×
C
AIR
×
V
AIR
×
1000
/
22.4
×
M
AIR
+
T
M
×
C
M
×
V
M
×
1000
/
22.4
×
M
M
)
(
1
)
tA:
combustion duration [min], kM:
M gas calorie [J/Nm3],
VM:
M gas flow rate [Nm3/min], TAIR:
combustion air temperature,
CAIR:
combustion air specific heat [J/g/° C.],
VAIR:
combustion air flow rate [Nm3/min],
MAIR:
combustion air specific heat [J/g/° C.],
TM:
M gas temperature [° C.], CM:
M gas specific heat [J/g/° C.],
VM:
M gas flow rate [Nm3/min],
MM:
M gas molecular weight [g/mol]
Q
out
=
∑
t
B
⁢
{
(
T
b
×
C
bN
⁢
2
-
T
c
×
C
CN
⁢
2
)
×
V
b
×
0.79
×
1000
/
22.4
×
M
N
⁢
2
+
(
T
b
×
C
bO
⁢
2
-
T
c
×
C
CO
⁢
2
)
×
(
V
b
×
0.21
+
V
O
⁢
2
-
V
OXY
)
×
1000
/
22.4
×
M
O
⁢
2
+
(
T
b
×
C
bmoi
-
T
C
×
C
Cmoi
)
×
(
V
b
×
moi
)
}
(
2
)
tB:
blast duration [min], Tb:
blast temperature [° C.],
CbN2:
N2 specific heat corresponding to 1200° C. [J/g/° C.],
TC:
cold blast temperature [° C.],
CCN2:
N2 specific heat corresponding to 200° C. [J/g/° C.],
Vb:
blast flow rate [Nm3/min],
MN2:
N2 molecular weight [g/mol],
CbO2:
O2 specific heat corresponding to 1200° C. [J/g/° C.],
CCO2:
O2 specific heat corresponding to 200° C. [J/g/° C.],
VO2:
total O2 flow rate O2 [Nm3/min],
VOXY:
oxygen flow rate [Nm3/min], MO2:
O2 specific heat [J/g/° C.],
Cbmoi:
vapor specific heat corresponding to 1200° C. [J/g/° C.],
CCmoi:
vapor specific heat corresponding to 200° C. [J/g/° C.],
moi:
blast moisture [g/Nm3]
η
=
Q
out
/
Q
in
(
3
)
Q
inHS
=
Q
out
/
η
(
4
)
V
M
⁢
_
⁢
B
=
Q
inHS
k
M
×
α
⁡
(
T
AIR
×
C
AIR
×
1000
/
22.4
×
M
AIR
)
+
T
M
×
C
M
×
1000
/
22.4
×
M
M
(
5
)
α:
air-fuel ratio

272 more elements

A combustion control device for a hot blast stove having a combustion step of storing, in a regenerator, a quantity of heat input by combusting a mixed gas, and a blast sending step of generating hot blast by supplying cold blast into the regenerator and supplying the generated hot blast to a blast furnace, the combustion control device comprising

a control unit configured to:
calculate an actual value of the quantity of heat as an actual quantity of heat input Qin by using the following Equation (1);
calculate a quantity of heat deprived of by generating the hot blast as an actual quantity of heat output Qout by using the following Equation (2);
calculate an actual value of thermal efficiency of the hot blast stove as an actual thermal efficiency η by using the following Equation (3);
calculate a quantity of heat to be input when hot blast is generated next time as a required quantity of heat input QinHS by using the following Equation (4);
calculate a quantity of the mixed gas VM_B to be supplied when the hot blast is generated next time by using the following Equation (5);
and
control the hot blast stove based on the calculated quantity of the mixed gas
V
M
⁢
_
⁢
B
·
Q
in
=
∑
t
A
⁢
(
k
M
×
V
M
+
T
AIR
×
C
AIR
×
V
AIR
×
1000
/
22.4
×
M
AIR
+
T
M
×
C
M
×
V
M
×
1000
/
22.4
×
M
M
)
(
1
)
tA:
combustion duration [min], kM:
M gas calorie [J/Nm3],
VM:
M gas flow rate [Nm3/min], TAIR:
combustion air temperature,
CAIR:
combustion air specific heat [J/g/° C.],
VAIR:
combustion air flow rate [Nm3/min],
MAIR:
combustion air specific heat [J/g/° C.],
TM:
M gas temperature [° C.], CM:
M gas specific heat [J/g/° C.],
VM:
M gas flow rate [Nm3/min],
MM:
M gas molecular weight [g/mol]
Q
out
=
∑
t
B
⁢
{
(
T
b
⁢
set
×
C
bN
⁢
2
-
T
c
×
C
CN
⁢
2
)
×
V
b
×
0.79
×
1000
/
22.4
×
M
N
⁢
2
+
(
T
b
×
C
bO
⁢
2
-
T
c
×
C
CO
⁢
2
)
×
(
V
b
×
0.21
+
V
O
⁢
2
-
V
OXY
)
×
1000
/
22.4
×
M
O
⁢
2
+
(
T
b
×
C
bmoi
-
T
C
×
C
Cmoi
)
×
(
V
b
×
moi
)
}
(
2
)
tB:
blast duration [min], Tb:
blast temperature [° C.],
CbN2:
N2 specific heat corresponding to 1200° C. [J/g/° C.],
TC:
cold blast temperature [° C.],
CCN2:
N2 specific heat corresponding to 200° C. [J/g/° C.],
Vb:
blast flow rate [Nm3/min],
MN2:
N2 molecular weight [g/mol],
CbO2:
O2 specific heat corresponding to 1200° C. [J/g/° C.],
CCO2:
O2 specific heat corresponding to 200° C. [J/g/° C.],
VO2:
total O2 flow rate [Nm3/min],
VOXY:
oxygen flow rate [Nm3/min], MO2:
O2 specific heat [J/g/° C.],
CCmoi:
vapor specific heat corresponding to 1200° C. [J/g/° C.],
CCmoi:
vapor specific heat corresponding to 200° C. [J/g/° C.],
moi:
blast moisture [g/Nm3]
η
=
Q
out
/
Q
in
(
3
)
Q
inHS
=
Q
out
/
η
(
4
)
V
M
⁢
_
⁢
B
=
Q
inHS
k
M
×
α
⁡
(
T
AIR
×
C
AIR
×
1000
/
22.4
×
M
AIR
)
+
T
M
×
C
M
×
1000
/
22.4
×
M
M
(
5
)
α:
air-fuel ratio

282 more elements

Dependencies are inferred from the claim text.

Combustion control method and combustion control device for hot blast stove

Life of this patent

Combustion control method and combustion control device for hot blast stove

Life of this patent

Abstract

Claims6