CA2047416A1 - Blast furnace pulverized coal injection drying apparatus - Google Patents
Blast furnace pulverized coal injection drying apparatusInfo
- Publication number
- CA2047416A1 CA2047416A1 CA002047416A CA2047416A CA2047416A1 CA 2047416 A1 CA2047416 A1 CA 2047416A1 CA 002047416 A CA002047416 A CA 002047416A CA 2047416 A CA2047416 A CA 2047416A CA 2047416 A1 CA2047416 A1 CA 2047416A1
- Authority
- CA
- Canada
- Prior art keywords
- gas
- drying
- blast furnace
- pulverized coal
- hot gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000001035 drying Methods 0.000 title claims abstract description 52
- 239000003245 coal Substances 0.000 title claims abstract description 43
- 238000002347 injection Methods 0.000 title claims abstract description 10
- 239000007924 injection Substances 0.000 title claims abstract description 10
- 238000000227 grinding Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 abstract description 100
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 3
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 26
- 238000001816 cooling Methods 0.000 description 9
- 239000011261 inert gas Substances 0.000 description 8
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Drying Of Solid Materials (AREA)
Abstract
ABSTRACT OF DISCLOSURE
The present invention relates to a blast furnace pulverized coal injection drying apparatus, comprising a hot gas generating furnace and a ground drying mill into which the gas generated in the hot gas generating furnace is introduced to grind and dry wet coal, wherein a branch pipe is placed on the exhaust gas pipe of the ground drying mill and is linked with the branch pipe with a dehumidifying apparatus, and the outlet pipe of the dehumidifying apparatus is connected with the outlet side of the hot gas generating furnace, whereby a high operational cost due to conventional use of nitrogen gas is reduced.
The present invention relates to a blast furnace pulverized coal injection drying apparatus, comprising a hot gas generating furnace and a ground drying mill into which the gas generated in the hot gas generating furnace is introduced to grind and dry wet coal, wherein a branch pipe is placed on the exhaust gas pipe of the ground drying mill and is linked with the branch pipe with a dehumidifying apparatus, and the outlet pipe of the dehumidifying apparatus is connected with the outlet side of the hot gas generating furnace, whereby a high operational cost due to conventional use of nitrogen gas is reduced.
Description
BLAST FURNACE PULVERIZED COAL INJECTION DRYING APPARATUS
Field of Invention _ . _ The present invention relates to a blast furnace pulverized coal injection (PCI) drying apparatus, more specifically to a blast furnace PCI drying apparatus employing and circulating the drying gas of a ground drying mill of the blast furnace PCI drying apparatus and having the circulating gas route e~uipped with a aehumidifying apparatus.
Brief Description of Drawings Fig. l is a flow diagram of an embodiment of the present invention.
Fig. 2 is a flow diagram of the blast furnace PCI
apparatus.
BACKGROUND OF INVENTION
Prior Art -Fig. 2 is a flow diagram of a blasting apparatus for blasting pulverized coal into a blast furnace.
Wet coal is fed through metallurgical coal bunker 101 and feed bin 102 into grounddrying mill 103, where the wet coal is ground and dried in hot gas blast to be formed into dried pulverized coal. The dried pulverized coal is then transported together with exhaust gas.
The drying gas for the ground drying mill is made up of the inert gas 107 which acts as a coolant to control the temperature, and the exhaust gas generated by allowing B gas (blast furnace gas) 105a and/or C gas (coke o~en gas) 105 to burn with combustion air 106. The drying gas is exhausted from ground ~ .
~ '' '; , ' , :
.
.
,.,; ~ .
' - 2 - 2~7~
drying mill 103 accompanied by ground and dried pulverized coal which has been produced by drying wet coal in ground drying mill 103. The pulverized coal transported together with the gas is collected b~ cyclone 111 and bag filter 112, and is stored in pulverized coal storage hopper 113 of the blast furnace PCI
apparatus. The exhaust gas separated from the pulverized coal is released from stack 120.
The pulverized coal stored in pulveri ed coal storage hopper 113 is transferred through intermediate tank 114 to injection tank 115. After pressurization by pressure gas 116, the pulverized coal is transferred through pulverized coal feed pipe 118 by carrier gas 117, and is then injected from a tuyere pipe into blast furnace 119.
As has been described above, because of its high temperature, it is necessary to cool the hot gas generated in hot gas generating furnace 104 before it is introduced into the wet coal grinding and drying mill 10~ where it is used for drying the wet coal~ For this purpose a gas of a lower temperature is mixed with it. rrhe gas for cooling the hot gas ~0 should be an inert gas containing scarcely an~ oxygen r in order to prevent an explosion of coal dust from the pulverized coal.
A suitable such inert gas is nitrogen gas,'``com~ustion exhaust gas or the like.
There is the technique of introducing into a hot gas generating furnace a part or all of the exhust gas ex~hausted from stack 120 of blast furnace PCI drying apparatus by circulat-ing it as inert gas using a fan. Howe~er such technique has .. .. ... - . .
- . . : .. ~ , ~ . . .
': ' '~1 ' 2 ~
been limited to the initial or final stage of operation of the blast furnace PCI apparatus, because the water content in the circulating gas increases.
The problem with the use of nitrogen gas as the inert ~as for hot yas ~enerating furnaces is the exceedingly high cost of such an operation. On the other hand, the use of the exhaust gas after combustion is generally accompanied by the problems that the operation of the combustion apparatus is influential and the layout of the pipe route for the exhaust gas is difficult. Circulation of the exhaust gas of a blast furnace PCI drying apparatus results in an increase in the water content in the circulating gas, so use of the exhaust gas is limited.
In order to solve these problemsl in accordance with the present invention, a dehumidifying apparatus is placed in the route of the exhaust gas from the blast furnace PCI drying apparatus and the exhaust gas, after water is removed therefrom with the dehumidifying apparatus, is used as an inert gas.
SUMM~RY OF THE INVENTION
In accordance with the present invention there is provided a blast furnace pulverized coal in~ection drying apparatus, comprising a hot gas generating furnace and a grinding and drying mill into which the gas generated in the hot gas generating furnace is introduced to grind and dry ~et coal, wherein a branch pipe is connected to an exhaust gas pipe from the grinding and drying mill and is linked with a dehumidifying apparatus, and an outlet pipe from the dehumidifyin~ apparatus is connected with the outlet side of the hot gas generating furnace.
.
.. .
:
.
727~
An object of the present invention is to provide an apparatus capable of collecting and circulating exhaust gas from an exhaust gas line of a blast furnace PCI drying apparatus and removing water from the circulating gas in order that the result-ing circulatin~ gas can be used as inert gas for a hot gas generating furnace.
The present invention comprises a blast furnace PCI
drying apparatus equipped with a hot gas generating furnace and a mill for grinding and drying wet coal using gas generated by a hot gas generating furnace. In the apparatus a branch pipe is connect~d to the pipe carrying the exhaust gas from a grinding and drying process taking place in a pulverized coal grinding and drying mill. The branch pipe is linked to a dehumidifying apparatus, and the outlet pipe of the dehumidifying apparatus is connected to the outlet side of the hot gas generating furnace~
The "outlet side of the hot gas generating furnace", referred to herein, means any part of the intermediate route which is followed by the gas from where it is generated in the hot gas generating furnace until its introduction into the grinding and drying mill. In other words, the term refers to the vicinity of the outlet of the hot gas generating furnace, the intermediate route of the pipe from the hot gas generating furnace to the ground drying mill, and further the vicinity of the inlet of the ground drying mill.
The term "dehumidifying apparatus" referrea~to herein means an apparatus which can remo~e water from the e~haust gas ~rom the ground drying mill, but is not necessarily an apparatus :. :
which decreases the relative humidity of the exhaust gas. The dehumidifying apparatus may comprise a scrubber which sprays water over the exhaust gas to remove dust from the exhaust gas and removes water from the exhaust gas by cooling the exhaus-t gas.
In such apparatus according to the present invention a branch pipe is connected to ~he exhaust gas line of a blast furnace PCI drying apparatus to circulate and use the exhaust ~as. A dehumidifying apparatus is connected to the branch pipe to prevent moisture increase in the circulating gas and to enable reuse of the exhaust gas as the circulating gas for the grinding and drying mill.
According to the present invention, a blast furnace PCI
drying apparatus operates without external re~uirements for inert gas. That is, an increase in water concentration due to the recirculation process is suppressed by decreasing in dew point and dewateriny using a scrubber, while temperature control is obtained by circulating gas using hot gas from the hot gas generating urnace, as inext gas.
Description of Preferred Embodiments Fig. 1 shows the flow diagram of an embodiment of the present invention. Wet coal 1 as the raw material of a blast urnace PCI is fed into ground drying mill 3. Ln the hot gas generating ~urnace 4, B gas Iblast furnace yas) 5a and/or C gas (coke oven gas) 5 are burned with combustion air 6 to generate hot gas, which is fed as hot blast gas into ground drying mill 3.
The temperature of the hot gas is controlled by introduction of cooling gas 24. The wet coal is dried while being ground in the .~ . .
:: .
- 6 ~ 7 i~ ~ ~
ground drying mill and is transported together with hot gas via exhaust pipe 7. The dried pulverized coal is collected in bag filter 42, and is store~ in pulverized coal storage hopper 43.
The exhaust gas separated from pulverized coal is released from stack 20.
A branch pipe 21 extracts a part or all of the exhaust gas of the blast furnace PCI drying apparatus flowing in exhaust gas line 7. The exhaust gas is aspirated by fan 22 and is introduced into dehumidifying apparatus 23. The dehumidifying apparatus 23 removes the water in the wet coal which serves as raw material which was introduced in ground drying mill 3. The gas exhausted from the dehumidif~ing apparatus 23 is in~roduced through outlet pipe 24 of the dehumidifying apparatus to the outlet side of hot gas generating furnace 4, to control the temperature of hot gas being fed from hot gas generating furnace 4. In this manner r the exhaust gas of the blast furnace PCI
drying apparatus is circulated as inert gas inside the blast furnace PCI drying apparatus.
In apparatus in which a scrubber is used as the dehumid-i~ying apparatus 23, spra~ nozzles 25 and filling mattar 26 are provided inside the scrubber, to cool the exhaust gas. In the process of this cooling, excess water content in the exhaust gas is removed. The water a~ter cooling the exhaust gas is fed to cooling tower 32, via hot water line 30 and hot water pump 31.
The water a~ter being cooled in the cooling tower is stored in reservoir 33. ~ater from the reservoir is circulated to the spray nozzle through aspiration line 29 and cooling water pipe 27, - , . . . .
-: . . : .
- - : : . - . . . -.. .. . . .
-- - ' , ' : ' '' : . .
- ~ ' ., ' ,., ~.:
2 0 L~ 7 ~ ~ 6 7275~-17 by means of cooling water pump 28.
Table 1 is an example of the material proportions used in the apparatus of the foregoing embodiment.
The water content of wet coal is about 1,500 kg/h, while the saturated water content of the gas at the scrubber inlet is about 22,500 kg/h and the saturated water content of the gas at the scrubber outlet is about 11,700 kg/h. The scrubber has sufficient capacity to dry the wet coal, and the capacity of the cooling tower is sufficiently high to remove the water content LO in the wet coal.
., ~ ~ . . : . .
- ' . :, .': :
- . ., , : . .
, . , ~
2~74 ~6 Table 1 _ Amount o~ B gas 2,540 Nm3/h Amount o~ C gas - 340 Nm3/h Amount of air 4,570 Nm3/h Raw material wet coal 24,600 kg/h Water content of raw material % 6 %
Water content in raw coal1,476 kg/h _ _ Bag filter Amount of gas at outlet41,800 Nm3/h Temperature at outlet 90C
(Amount of saturated water) ~27,628 kg/h) Amount of gas in branch pipe 32,220 Nm3/h Ratio 77 %
Water content 12,867 kg/h Scrubber Amount of gas at inlet32,220 Nm3/h Gas temperature at inlet 85C
Water content of gas at inlet (Amount of saturated water) (22,566 kg/h~
Amount of gas at outlet30,740 Nm3/h Gas temperature at outlet ~0C
(Amount of saturated water) (11,730 kg/h) Amount of cooling water250 ~on/h in circulation Temperature of cooling water 25C
Amount of lukewarm water250 Ton/h Temperature of lukewarm water 32C
Cooling tower 1,244 x 106 Kcal/h . - . -. .
. .
. , ~ ~ : -,. . ..
- ' ', ' . ".' ~' ,, ~, ' ' : ' ' ': : ' ` " :
- ' : . . :., ~
Field of Invention _ . _ The present invention relates to a blast furnace pulverized coal injection (PCI) drying apparatus, more specifically to a blast furnace PCI drying apparatus employing and circulating the drying gas of a ground drying mill of the blast furnace PCI drying apparatus and having the circulating gas route e~uipped with a aehumidifying apparatus.
Brief Description of Drawings Fig. l is a flow diagram of an embodiment of the present invention.
Fig. 2 is a flow diagram of the blast furnace PCI
apparatus.
BACKGROUND OF INVENTION
Prior Art -Fig. 2 is a flow diagram of a blasting apparatus for blasting pulverized coal into a blast furnace.
Wet coal is fed through metallurgical coal bunker 101 and feed bin 102 into grounddrying mill 103, where the wet coal is ground and dried in hot gas blast to be formed into dried pulverized coal. The dried pulverized coal is then transported together with exhaust gas.
The drying gas for the ground drying mill is made up of the inert gas 107 which acts as a coolant to control the temperature, and the exhaust gas generated by allowing B gas (blast furnace gas) 105a and/or C gas (coke o~en gas) 105 to burn with combustion air 106. The drying gas is exhausted from ground ~ .
~ '' '; , ' , :
.
.
,.,; ~ .
' - 2 - 2~7~
drying mill 103 accompanied by ground and dried pulverized coal which has been produced by drying wet coal in ground drying mill 103. The pulverized coal transported together with the gas is collected b~ cyclone 111 and bag filter 112, and is stored in pulverized coal storage hopper 113 of the blast furnace PCI
apparatus. The exhaust gas separated from the pulverized coal is released from stack 120.
The pulverized coal stored in pulveri ed coal storage hopper 113 is transferred through intermediate tank 114 to injection tank 115. After pressurization by pressure gas 116, the pulverized coal is transferred through pulverized coal feed pipe 118 by carrier gas 117, and is then injected from a tuyere pipe into blast furnace 119.
As has been described above, because of its high temperature, it is necessary to cool the hot gas generated in hot gas generating furnace 104 before it is introduced into the wet coal grinding and drying mill 10~ where it is used for drying the wet coal~ For this purpose a gas of a lower temperature is mixed with it. rrhe gas for cooling the hot gas ~0 should be an inert gas containing scarcely an~ oxygen r in order to prevent an explosion of coal dust from the pulverized coal.
A suitable such inert gas is nitrogen gas,'``com~ustion exhaust gas or the like.
There is the technique of introducing into a hot gas generating furnace a part or all of the exhust gas ex~hausted from stack 120 of blast furnace PCI drying apparatus by circulat-ing it as inert gas using a fan. Howe~er such technique has .. .. ... - . .
- . . : .. ~ , ~ . . .
': ' '~1 ' 2 ~
been limited to the initial or final stage of operation of the blast furnace PCI apparatus, because the water content in the circulating gas increases.
The problem with the use of nitrogen gas as the inert ~as for hot yas ~enerating furnaces is the exceedingly high cost of such an operation. On the other hand, the use of the exhaust gas after combustion is generally accompanied by the problems that the operation of the combustion apparatus is influential and the layout of the pipe route for the exhaust gas is difficult. Circulation of the exhaust gas of a blast furnace PCI drying apparatus results in an increase in the water content in the circulating gas, so use of the exhaust gas is limited.
In order to solve these problemsl in accordance with the present invention, a dehumidifying apparatus is placed in the route of the exhaust gas from the blast furnace PCI drying apparatus and the exhaust gas, after water is removed therefrom with the dehumidifying apparatus, is used as an inert gas.
SUMM~RY OF THE INVENTION
In accordance with the present invention there is provided a blast furnace pulverized coal in~ection drying apparatus, comprising a hot gas generating furnace and a grinding and drying mill into which the gas generated in the hot gas generating furnace is introduced to grind and dry ~et coal, wherein a branch pipe is connected to an exhaust gas pipe from the grinding and drying mill and is linked with a dehumidifying apparatus, and an outlet pipe from the dehumidifyin~ apparatus is connected with the outlet side of the hot gas generating furnace.
.
.. .
:
.
727~
An object of the present invention is to provide an apparatus capable of collecting and circulating exhaust gas from an exhaust gas line of a blast furnace PCI drying apparatus and removing water from the circulating gas in order that the result-ing circulatin~ gas can be used as inert gas for a hot gas generating furnace.
The present invention comprises a blast furnace PCI
drying apparatus equipped with a hot gas generating furnace and a mill for grinding and drying wet coal using gas generated by a hot gas generating furnace. In the apparatus a branch pipe is connect~d to the pipe carrying the exhaust gas from a grinding and drying process taking place in a pulverized coal grinding and drying mill. The branch pipe is linked to a dehumidifying apparatus, and the outlet pipe of the dehumidifying apparatus is connected to the outlet side of the hot gas generating furnace~
The "outlet side of the hot gas generating furnace", referred to herein, means any part of the intermediate route which is followed by the gas from where it is generated in the hot gas generating furnace until its introduction into the grinding and drying mill. In other words, the term refers to the vicinity of the outlet of the hot gas generating furnace, the intermediate route of the pipe from the hot gas generating furnace to the ground drying mill, and further the vicinity of the inlet of the ground drying mill.
The term "dehumidifying apparatus" referrea~to herein means an apparatus which can remo~e water from the e~haust gas ~rom the ground drying mill, but is not necessarily an apparatus :. :
which decreases the relative humidity of the exhaust gas. The dehumidifying apparatus may comprise a scrubber which sprays water over the exhaust gas to remove dust from the exhaust gas and removes water from the exhaust gas by cooling the exhaus-t gas.
In such apparatus according to the present invention a branch pipe is connected to ~he exhaust gas line of a blast furnace PCI drying apparatus to circulate and use the exhaust ~as. A dehumidifying apparatus is connected to the branch pipe to prevent moisture increase in the circulating gas and to enable reuse of the exhaust gas as the circulating gas for the grinding and drying mill.
According to the present invention, a blast furnace PCI
drying apparatus operates without external re~uirements for inert gas. That is, an increase in water concentration due to the recirculation process is suppressed by decreasing in dew point and dewateriny using a scrubber, while temperature control is obtained by circulating gas using hot gas from the hot gas generating urnace, as inext gas.
Description of Preferred Embodiments Fig. 1 shows the flow diagram of an embodiment of the present invention. Wet coal 1 as the raw material of a blast urnace PCI is fed into ground drying mill 3. Ln the hot gas generating ~urnace 4, B gas Iblast furnace yas) 5a and/or C gas (coke oven gas) 5 are burned with combustion air 6 to generate hot gas, which is fed as hot blast gas into ground drying mill 3.
The temperature of the hot gas is controlled by introduction of cooling gas 24. The wet coal is dried while being ground in the .~ . .
:: .
- 6 ~ 7 i~ ~ ~
ground drying mill and is transported together with hot gas via exhaust pipe 7. The dried pulverized coal is collected in bag filter 42, and is store~ in pulverized coal storage hopper 43.
The exhaust gas separated from pulverized coal is released from stack 20.
A branch pipe 21 extracts a part or all of the exhaust gas of the blast furnace PCI drying apparatus flowing in exhaust gas line 7. The exhaust gas is aspirated by fan 22 and is introduced into dehumidifying apparatus 23. The dehumidifying apparatus 23 removes the water in the wet coal which serves as raw material which was introduced in ground drying mill 3. The gas exhausted from the dehumidif~ing apparatus 23 is in~roduced through outlet pipe 24 of the dehumidifying apparatus to the outlet side of hot gas generating furnace 4, to control the temperature of hot gas being fed from hot gas generating furnace 4. In this manner r the exhaust gas of the blast furnace PCI
drying apparatus is circulated as inert gas inside the blast furnace PCI drying apparatus.
In apparatus in which a scrubber is used as the dehumid-i~ying apparatus 23, spra~ nozzles 25 and filling mattar 26 are provided inside the scrubber, to cool the exhaust gas. In the process of this cooling, excess water content in the exhaust gas is removed. The water a~ter cooling the exhaust gas is fed to cooling tower 32, via hot water line 30 and hot water pump 31.
The water a~ter being cooled in the cooling tower is stored in reservoir 33. ~ater from the reservoir is circulated to the spray nozzle through aspiration line 29 and cooling water pipe 27, - , . . . .
-: . . : .
- - : : . - . . . -.. .. . . .
-- - ' , ' : ' '' : . .
- ~ ' ., ' ,., ~.:
2 0 L~ 7 ~ ~ 6 7275~-17 by means of cooling water pump 28.
Table 1 is an example of the material proportions used in the apparatus of the foregoing embodiment.
The water content of wet coal is about 1,500 kg/h, while the saturated water content of the gas at the scrubber inlet is about 22,500 kg/h and the saturated water content of the gas at the scrubber outlet is about 11,700 kg/h. The scrubber has sufficient capacity to dry the wet coal, and the capacity of the cooling tower is sufficiently high to remove the water content LO in the wet coal.
., ~ ~ . . : . .
- ' . :, .': :
- . ., , : . .
, . , ~
2~74 ~6 Table 1 _ Amount o~ B gas 2,540 Nm3/h Amount o~ C gas - 340 Nm3/h Amount of air 4,570 Nm3/h Raw material wet coal 24,600 kg/h Water content of raw material % 6 %
Water content in raw coal1,476 kg/h _ _ Bag filter Amount of gas at outlet41,800 Nm3/h Temperature at outlet 90C
(Amount of saturated water) ~27,628 kg/h) Amount of gas in branch pipe 32,220 Nm3/h Ratio 77 %
Water content 12,867 kg/h Scrubber Amount of gas at inlet32,220 Nm3/h Gas temperature at inlet 85C
Water content of gas at inlet (Amount of saturated water) (22,566 kg/h~
Amount of gas at outlet30,740 Nm3/h Gas temperature at outlet ~0C
(Amount of saturated water) (11,730 kg/h) Amount of cooling water250 ~on/h in circulation Temperature of cooling water 25C
Amount of lukewarm water250 Ton/h Temperature of lukewarm water 32C
Cooling tower 1,244 x 106 Kcal/h . - . -. .
. .
. , ~ ~ : -,. . ..
- ' ', ' . ".' ~' ,, ~, ' ' : ' ' ': : ' ` " :
- ' : . . :., ~
Claims (5)
1. A blast furnace pulverized coal injection drying apparatus, comprising a hot gas generating furnace and a grinding and drying mill into which the gas generated in the hot gas generating furnace is introduced to grind and dry wet coal, wherein a branch pipe is connected to an exhaust gas pipe from the grinding and drying mill and is linked with a dehumidifying apparatus, and an outlet pipe from the dehumidifying apparatus is connected with the outlet side of the hot gas generating furnace.
2. The blast furnace pulverized coal injection drying apparatus according to claim 1, wherein the outlet pipe of the dehumidifying apparatus is connected in the vicinity of the outlet of the hot gas generating furnace.
3. The blast furnace pulverized coal injection drying apparatus according to claim 1, wherein the outlet pipe of the dehumidifying apparatus is connected to the pipe carrying the gas generated in the hot gas generating furnace to the ground drying mill.
4. The blast furnace pulverized coal injection drying apparatus according to claim 1, wherein the outlet pipe of the dehumidifying apparatus is connected to the inlet of the grinding and drying mill, in the vicinity in which the gas generated in the hot gas generating furnace is introduced.
5. The blast furnace pulverized coal injection drying apparatus according to claim 1, wherein the dehumidifying apparatus is a scrubber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2190745A JPH0742491B2 (en) | 1990-07-20 | 1990-07-20 | Blast furnace blowing pulverized coal dryer |
| JP2-190745 | 1990-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2047416A1 true CA2047416A1 (en) | 1992-01-21 |
Family
ID=16263047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002047416A Abandoned CA2047416A1 (en) | 1990-07-20 | 1991-07-19 | Blast furnace pulverized coal injection drying apparatus |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0467375A1 (en) |
| JP (1) | JPH0742491B2 (en) |
| AU (1) | AU8047191A (en) |
| BR (1) | BR9103105A (en) |
| CA (1) | CA2047416A1 (en) |
| ZA (1) | ZA915501B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2281311B (en) * | 1993-03-29 | 1996-09-04 | Boc Group Plc | Metallurgical processes and apparatus |
| KR100862774B1 (en) * | 2002-08-06 | 2008-10-13 | 주식회사 포스코 | Pulverized coal manufacturing equipment |
| LU91450B1 (en) * | 2008-06-02 | 2009-12-03 | Wurth Paul Sa | Method for producing pulverized coal |
| LU91451B1 (en) * | 2008-06-02 | 2009-12-03 | Wurth Paul Sa | Method for producing pulverized coal |
| CN105651035A (en) * | 2016-02-29 | 2016-06-08 | 成都绿迪科技有限公司 | Peat drying device |
| CN109733757B (en) * | 2019-01-18 | 2023-07-07 | 华电电力科学研究院有限公司 | Explosion-proof device and explosion-proof method for pulverized coal bin charging smoke |
| JP7474049B2 (en) * | 2019-12-26 | 2024-04-24 | 川崎重工業株式会社 | Coal Crushing System |
| CN113457814A (en) * | 2021-06-22 | 2021-10-01 | 镇江市蓝火环保能源有限公司 | Coal powder treatment method |
| CN116287502A (en) * | 2023-04-27 | 2023-06-23 | 重庆钢铁股份有限公司 | System and method capable of circulating and secondarily drying pulverized coal |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3306238A (en) * | 1965-05-20 | 1967-02-28 | Armco Steel Corp | Fuel injection system for blast furnaces |
| JPS5956495A (en) * | 1982-08-10 | 1984-03-31 | Kobe Steel Ltd | Equipment for crushing, drying and transporting powder fuel for blowing into blast furnace |
| JPS61111946U (en) * | 1984-12-26 | 1986-07-15 | ||
| JPS62123217A (en) * | 1985-11-22 | 1987-06-04 | Sumitomo Metal Ind Ltd | Method for drying pulverized coal for blowing into blast furnaces |
-
1990
- 1990-07-20 JP JP2190745A patent/JPH0742491B2/en not_active Expired - Lifetime
-
1991
- 1991-07-15 ZA ZA915501A patent/ZA915501B/en unknown
- 1991-07-16 AU AU80471/91A patent/AU8047191A/en not_active Abandoned
- 1991-07-18 EP EP91112059A patent/EP0467375A1/en not_active Withdrawn
- 1991-07-19 BR BR919103105A patent/BR9103105A/en not_active Application Discontinuation
- 1991-07-19 CA CA002047416A patent/CA2047416A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| ZA915501B (en) | 1992-04-29 |
| JPH0742491B2 (en) | 1995-05-10 |
| AU8047191A (en) | 1992-01-23 |
| BR9103105A (en) | 1992-05-05 |
| EP0467375A1 (en) | 1992-01-22 |
| JPH0480307A (en) | 1992-03-13 |
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