CA1160046A - Aeration feeder for supplying pulverized coal to blast furnace hearth - Google Patents
Aeration feeder for supplying pulverized coal to blast furnace hearthInfo
- Publication number
- CA1160046A CA1160046A CA000390646A CA390646A CA1160046A CA 1160046 A CA1160046 A CA 1160046A CA 000390646 A CA000390646 A CA 000390646A CA 390646 A CA390646 A CA 390646A CA 1160046 A CA1160046 A CA 1160046A
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- discharging
- pulverized coal
- aeration
- feeder
- 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.)
- Expired
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- Manufacture Of Iron (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The aeration feeder for supplying pulverized coal to a blast furnace hearth comprises an aeration chamber provided with a valve gear screen disposed thereacross, a discharging pipe provided with a discharging door disposed on a side surface of an end of this pipe located within the aeration chamber, a locking and regulating element telescopically inserted into said pipe and provided with a hollow rod, and periodically shutting off the discharging door. According to the invention, the locking and re-gulating element is made in the form of a rotating bush provided with calibrated openings on the side surface thereof, said open-ings alternatively communicating with the discharging door pro-vided in the discharging pipe.
The aeration feeder for supplying pulverized coal to a blast furnace hearth comprises an aeration chamber provided with a valve gear screen disposed thereacross, a discharging pipe provided with a discharging door disposed on a side surface of an end of this pipe located within the aeration chamber, a locking and regulating element telescopically inserted into said pipe and provided with a hollow rod, and periodically shutting off the discharging door. According to the invention, the locking and re-gulating element is made in the form of a rotating bush provided with calibrated openings on the side surface thereof, said open-ings alternatively communicating with the discharging door pro-vided in the discharging pipe.
Description
The invention relates to ferrous metallurgy, and more particularly to an aeration feeder for supplying pulverized coal to a blast furnace hearth.
The invention may prove most advantageous in blast fur-nace melting utilizing injection of pulverized coal into a blast furnace hearth.
In the prior art feeders, surfaces of elements carrying out batch distribution of pulverized coal to blast furnace tuyer-es, are subject to intensive abrasion wear, thereby leading to a decrease in the accuracy of batching pulverized coal being sup-plied to the blast furnace.
Known in the art is an aeration feeder (Yaroshevsky S.L.
et al., Priminenie pyleugolnogo topliva dlya vyplavki chuguna, Kiev. 1974, str. 119-120), comprising an aeration chamber provid-ed with a valve gear screen disposed across said chamber, a dis-charging pipe provided with a bell mouth at the end thereof, said bell mouth being disposed within said chamber. Coaxially with the bell mouth of the discharging pipe there is disposed a locking rod adapted for axial movement, said rod periodically interacting by the locking end thereof with the inner surface of the bell.
Within the aeration chamber of this feeder there is ac-complished fluidization of pulverized cbal, the latter being then fed into the discharging pipe through the bell mouth.
Batching pulverized coal being discharged from the feed-er along the discharging pipe, and disconnecting the dust flow is carried out by varying a distance between the inner surface of the bell mouth and the locking end of the rod which rod, while moving in the axial direction until approaching the pipe bell, can shut off inlet of fuel into the pipe.
It is obvious that the inner surface of the bell mouth and the locking ~nd of the rod being flown around by pulveriæed coal, are subject to intensive abrasion wear, thereby resulting in ~6~0~6 the violation of the accuracy of batching pulverized coal being supplied to blast furnace -tuyeres.
Also known in the art is an aeration feeder (USSR Au-thor's Certificate No. 512241), comprising an aeration chamber provided with a valve gear screen, a discharging pipe provided with a charging door on the side surface thereof, and with a locking and regulating element being rigidly connected with a hol-low rod adapted for movement in the axial direction. The rod is disposed coaxially with the discharging pipe in such a manner that the locking and regulating element being in the form of a nozzle, is inserted in the telescopic way into this pipe, and with the rod being shifted in the axial direction, said element opens ei-ther partially or completeiy the discharging door provided in said pipe, thereby regulating the batch of pulverized coal being supplied thereinto.
The feeder operates as follows:
The aeration chamber is supplied with air which air, while passing through the valve gear screen, fluidizes pulverized coal. Under a certain pressure within the aeration chamber, said pressure depending on resistance at the inlet of the discharging pipe and on required capacity of the feeder, pulverized coal is supplied into this pipe through the side discharging door.
The capacity of the feeder is regulated by shifting the rod along the side discharging door of the transportation pipe, the lock-ing and regulating element of said rod changing the inlet cross-section of the discharging door, and hence the amount of pul-verized coal being supplied by the feeder to the blast furnace tuyere.
However in this feeder the locking surfaces are also subject to the effect of pulverized coal and get worn ~apidIy thereby ~esulting in the violation of the batching accuracy, parti-~.",, ~
cularly due to an increase ,in clearance between the lockingand regulating element of the rod and the discharging pipe, through which clearance an unlimited portion of the aerated mix-ture is returned into the aeration chamber. Moreover, increasing the cross-section of the discharging door caused by wear of side walls defining said door, also results in an uncertainty of bat-ching pulverized coal being supplied into the discharging pipe and thence to the b~ast furnace tuyeres.
The object of the invention is such a provision of a locking and regulating element within the aeration feeder for supplying pulverized coal to the blast furnace,which would pro-vide for the high accuracy of batching pulverized coal supplied to the blast ~urnace tuyeres by decreasing the wear of the surface being in contact with said pulverized coal.
The invention consists in that an aeration feeder for supplying pulverized coal to a blast furnace comprises an aeration chamber, a valve gear screen disposed across said chamber, a discharging pipe provided with a discharging door on the side sur-face of the end of this pipe, said end being disposed within the aeration chamber and inserted in the telescopic way into said pipe, and a locking and regulating element provided with a hollow rod, said element being in the form of a rotating bush provided with calibrated openings which alternatively communicate with the discharging door provided in the discharging pipe.
Such an arrangement of the feeder for supplying pulveri-zed coal makes it possible to increase the accuracy of batching due to the fact that pulverized coal is supplied to the discharg-ing pipe directly through the discharging door and through the openings provided in said bush without being in contact with the contacting surfaces of the bush and those of the pipe.
It is expedient to provide a supplementary discharging door the discharging pipe, said supplementary door being diametri-,, G
-ally opposite said discharging door, and to dispose the calibrat-ed openings provided in the bush, in pairs and symmetrically.
The availability of two diametrically opposite discharging doors in the dischar~ing pipe, and the provision of the calibrated open-ings in the bush as above described, makes it possible to create counter flows of pulverized coal within the bush of the feeder, thereby considerably decreasing the abrasion wear of the bush walls and reducing the possibility of damaging the feeder. The above arrangement also allows the pressure gradient between the aeration chamber and the transportation pipeline to be increased, thereby ~ making possible a more flexible and accurate regulation of the feeder capacity which capacity depends upon this gradient.
It is also expedient to place wear-resistant inserts prc-vided with conduits, into the calibrated openings, the total area of each pair of the diametrically opposite conduits being of 0.05 to 0.20 from the cross-section area of the discharging pipe. Such an arrangement allows the wear of walls defining the calibrated openings to be reduced, the required increase in the batching ac-curacy without additional energy expenditure being possible only with the above magnitude of the total area of said conduits.
Reducing the total area of the conduits below 0.05 of the cross-section area of the discharging pipe is undesirable since it requires increasing the power of blasting means with the pre-determined consumption of pulverized coal and therefore leads to an elevated energy expenditure for aerating pulverized coal. In the case where the total area of the conduits provided within the inserts exceeds 0.20 from the cross-section area of the discharg-ing pipe, the batching accuracy will not be practically increased due to a decrease in the pressure gradient between the aeration ` chamber and the discharging pipe.
The invention will now be further explained in terms of specific examples of embodiments thereof with reference to the ~ccompanying drawings, in which:-Fiy. 1 shows the aeration feeder of the invention forsupplying pulverized coal to the blast furnace, general view, lon-gitudinal section;
Fig. 2 shows the fragment 1 in Fig. 1, in which there are illustrated the discharging pipe provided with the discharg-ing doors, and the bush provided with the calibrated openings in working position, enlarged view, longitudinal section; and Figs. 3, ~ and 5, illustrate embodiments of the locking and regulating element being the bush, and those of the discharg-ing pipe in working position, cross-sectional view.
The aeration feeder for supplying pulverized coal to the blast furnace comprises an aeration chamber 1 (Figs. 1 through 3) provided with a valve gear screen 2, a collector 3, and a branch pipe 4 for supplying aerating air. A discharging pipe 5 provided with a side discharging door 6 is inserted into the aeration cham-ber 1. Inside the discharging pipe 5 there is disposed a locking and regulating element being a rotatable bush 7 connected with a hollow rod 8, the other end of said rod being lead out of the pipe ~0 cavity 5 through a packing gland 9. The end of the hollow rod-8 is plugged and a handle 10 is fitted thereon, said handle serving for rotating the rod 8 and the bush 7. Openings 11 are provided in the side walls of the rod 8 for passing air inside the bush 7.
The bush 7 is provided with a plurality of calibrated openings 12 being periodically communicated with the side door 6 provided with-in the discharging pipe 5, thereby ensuring supply of material at the predetermined flow rate.
Such an arrangement of the aeration feeder makes it pos-sible to increase the batching accuracy due to the fact that pul-verized coal is supplied into the discharging pipe directly throughthe bush. The surfaces of contact between the bush and the pipe are not subject to abrasion wear thereby eliminating uncontrolled leak-4~
age of gas therebetween.
As it is shown in Fig. 4, the discharging pipe 5 of the feeder can be provided with a supplementary side discharging door 13 disposed diametrically opposite to the first door, while the calibrated openings 12 in the bush 7 are provided in pairs and symmetrically.
The above arrangement makes it possible to carry out supplying pulverized coal into ~he bush in counter flows, thereby considerably reducing the abrasion wear of the bush~ and increas-ing the pressure gradient between the aeration chamber and the discharging pipe, and hence carrying out a more flexible and ac-curate regulation of the batch of pulverized coal being supplied to the blast furnace.
Fig. S shows a further embodiment of the invention wherein into the calibrated openings 12 of the bush 7 there are placed wear-resistant inserts 14 made of, e.g. metal ceramics. The inserts 14 are provided with conduits 15, the total area of a pair of diametrically opposite conduits l5 being O.05 to 0.20 of the cross-section of the discharging pipe 5.
As has been above specified, decreasing the total arèa of the conduits 15 below 0.05 of the cross-section area of the dis-charging pipe is undesirable since it requires increasing the po-wer of blasting means at a predetermined consumption of pulverized coal, and therefore leads to an elevated energy expenditure for aerating pulverized coal. In the case where the total area of the conduits provided within the insert~ exceeds 0.20 of the area of the discharging pipe, the batching accuracy will not be practical-ly increased due to a decrease in the pressure gradient between the aeration chamber and the discharging pipe.
The apparatus operates as follows:
An aerating gas, e.g. air, is supplied in-to the collec-tor 3 (Figs. 1, 2 and 3), the flow rate of said gas being of 5 to 15% of the flow rate of a yas transporting pulverized coal. Pul-verized coal disposed above the valve gear screen 2 within the ae-ration chamber 1, changes to the fluidized state, and with mat-ching one of the calibrated openings 12 of the bush 7 with the discharging door 6 of the discharging pipe 5, is supplied inside this pipe. During the supply of transportation gas through the opening 11 of the hollow rod 8 there starts the discharge of pul-verized coal out of the feeder to the blast furnace tuyeres.
In the embodiment of the feeder shown in Fig. 4, pro-vided with the supplementary discharging door 13 within the pipe 5, pulverized coal gets into the bush 7 in the form of counter flows, and is discharged into the discharging pipe 5 at a velo-city on the inner surface of the bush being close to zero, there-by promoting a decrease in the wear thereof. Due to this fact, a higher pressure gradient may be achieved between the chamber 1 and the discharging pipe 5, said gradient being, e.g. of 2.105 Pa, that is considerably higher than the magnitude of pressure pulsa-tions at the blast furnace tuyeres and within the pipelines which pulsation is of 1.10 to 2.104 Pa, therefore the influence of said pulsations upon the total hydraulic resistance of the system (feed-er-pipeline-tuyere) is insignifiGant. Thus, a high accuracy of bat-ching pulverized coal supplied to the blast furnace tuyeres is achieved.
The invention may prove most advantageous in blast fur-nace melting utilizing injection of pulverized coal into a blast furnace hearth.
In the prior art feeders, surfaces of elements carrying out batch distribution of pulverized coal to blast furnace tuyer-es, are subject to intensive abrasion wear, thereby leading to a decrease in the accuracy of batching pulverized coal being sup-plied to the blast furnace.
Known in the art is an aeration feeder (Yaroshevsky S.L.
et al., Priminenie pyleugolnogo topliva dlya vyplavki chuguna, Kiev. 1974, str. 119-120), comprising an aeration chamber provid-ed with a valve gear screen disposed across said chamber, a dis-charging pipe provided with a bell mouth at the end thereof, said bell mouth being disposed within said chamber. Coaxially with the bell mouth of the discharging pipe there is disposed a locking rod adapted for axial movement, said rod periodically interacting by the locking end thereof with the inner surface of the bell.
Within the aeration chamber of this feeder there is ac-complished fluidization of pulverized cbal, the latter being then fed into the discharging pipe through the bell mouth.
Batching pulverized coal being discharged from the feed-er along the discharging pipe, and disconnecting the dust flow is carried out by varying a distance between the inner surface of the bell mouth and the locking end of the rod which rod, while moving in the axial direction until approaching the pipe bell, can shut off inlet of fuel into the pipe.
It is obvious that the inner surface of the bell mouth and the locking ~nd of the rod being flown around by pulveriæed coal, are subject to intensive abrasion wear, thereby resulting in ~6~0~6 the violation of the accuracy of batching pulverized coal being supplied to blast furnace -tuyeres.
Also known in the art is an aeration feeder (USSR Au-thor's Certificate No. 512241), comprising an aeration chamber provided with a valve gear screen, a discharging pipe provided with a charging door on the side surface thereof, and with a locking and regulating element being rigidly connected with a hol-low rod adapted for movement in the axial direction. The rod is disposed coaxially with the discharging pipe in such a manner that the locking and regulating element being in the form of a nozzle, is inserted in the telescopic way into this pipe, and with the rod being shifted in the axial direction, said element opens ei-ther partially or completeiy the discharging door provided in said pipe, thereby regulating the batch of pulverized coal being supplied thereinto.
The feeder operates as follows:
The aeration chamber is supplied with air which air, while passing through the valve gear screen, fluidizes pulverized coal. Under a certain pressure within the aeration chamber, said pressure depending on resistance at the inlet of the discharging pipe and on required capacity of the feeder, pulverized coal is supplied into this pipe through the side discharging door.
The capacity of the feeder is regulated by shifting the rod along the side discharging door of the transportation pipe, the lock-ing and regulating element of said rod changing the inlet cross-section of the discharging door, and hence the amount of pul-verized coal being supplied by the feeder to the blast furnace tuyere.
However in this feeder the locking surfaces are also subject to the effect of pulverized coal and get worn ~apidIy thereby ~esulting in the violation of the batching accuracy, parti-~.",, ~
cularly due to an increase ,in clearance between the lockingand regulating element of the rod and the discharging pipe, through which clearance an unlimited portion of the aerated mix-ture is returned into the aeration chamber. Moreover, increasing the cross-section of the discharging door caused by wear of side walls defining said door, also results in an uncertainty of bat-ching pulverized coal being supplied into the discharging pipe and thence to the b~ast furnace tuyeres.
The object of the invention is such a provision of a locking and regulating element within the aeration feeder for supplying pulverized coal to the blast furnace,which would pro-vide for the high accuracy of batching pulverized coal supplied to the blast ~urnace tuyeres by decreasing the wear of the surface being in contact with said pulverized coal.
The invention consists in that an aeration feeder for supplying pulverized coal to a blast furnace comprises an aeration chamber, a valve gear screen disposed across said chamber, a discharging pipe provided with a discharging door on the side sur-face of the end of this pipe, said end being disposed within the aeration chamber and inserted in the telescopic way into said pipe, and a locking and regulating element provided with a hollow rod, said element being in the form of a rotating bush provided with calibrated openings which alternatively communicate with the discharging door provided in the discharging pipe.
Such an arrangement of the feeder for supplying pulveri-zed coal makes it possible to increase the accuracy of batching due to the fact that pulverized coal is supplied to the discharg-ing pipe directly through the discharging door and through the openings provided in said bush without being in contact with the contacting surfaces of the bush and those of the pipe.
It is expedient to provide a supplementary discharging door the discharging pipe, said supplementary door being diametri-,, G
-ally opposite said discharging door, and to dispose the calibrat-ed openings provided in the bush, in pairs and symmetrically.
The availability of two diametrically opposite discharging doors in the dischar~ing pipe, and the provision of the calibrated open-ings in the bush as above described, makes it possible to create counter flows of pulverized coal within the bush of the feeder, thereby considerably decreasing the abrasion wear of the bush walls and reducing the possibility of damaging the feeder. The above arrangement also allows the pressure gradient between the aeration chamber and the transportation pipeline to be increased, thereby ~ making possible a more flexible and accurate regulation of the feeder capacity which capacity depends upon this gradient.
It is also expedient to place wear-resistant inserts prc-vided with conduits, into the calibrated openings, the total area of each pair of the diametrically opposite conduits being of 0.05 to 0.20 from the cross-section area of the discharging pipe. Such an arrangement allows the wear of walls defining the calibrated openings to be reduced, the required increase in the batching ac-curacy without additional energy expenditure being possible only with the above magnitude of the total area of said conduits.
Reducing the total area of the conduits below 0.05 of the cross-section area of the discharging pipe is undesirable since it requires increasing the power of blasting means with the pre-determined consumption of pulverized coal and therefore leads to an elevated energy expenditure for aerating pulverized coal. In the case where the total area of the conduits provided within the inserts exceeds 0.20 from the cross-section area of the discharg-ing pipe, the batching accuracy will not be practically increased due to a decrease in the pressure gradient between the aeration ` chamber and the discharging pipe.
The invention will now be further explained in terms of specific examples of embodiments thereof with reference to the ~ccompanying drawings, in which:-Fiy. 1 shows the aeration feeder of the invention forsupplying pulverized coal to the blast furnace, general view, lon-gitudinal section;
Fig. 2 shows the fragment 1 in Fig. 1, in which there are illustrated the discharging pipe provided with the discharg-ing doors, and the bush provided with the calibrated openings in working position, enlarged view, longitudinal section; and Figs. 3, ~ and 5, illustrate embodiments of the locking and regulating element being the bush, and those of the discharg-ing pipe in working position, cross-sectional view.
The aeration feeder for supplying pulverized coal to the blast furnace comprises an aeration chamber 1 (Figs. 1 through 3) provided with a valve gear screen 2, a collector 3, and a branch pipe 4 for supplying aerating air. A discharging pipe 5 provided with a side discharging door 6 is inserted into the aeration cham-ber 1. Inside the discharging pipe 5 there is disposed a locking and regulating element being a rotatable bush 7 connected with a hollow rod 8, the other end of said rod being lead out of the pipe ~0 cavity 5 through a packing gland 9. The end of the hollow rod-8 is plugged and a handle 10 is fitted thereon, said handle serving for rotating the rod 8 and the bush 7. Openings 11 are provided in the side walls of the rod 8 for passing air inside the bush 7.
The bush 7 is provided with a plurality of calibrated openings 12 being periodically communicated with the side door 6 provided with-in the discharging pipe 5, thereby ensuring supply of material at the predetermined flow rate.
Such an arrangement of the aeration feeder makes it pos-sible to increase the batching accuracy due to the fact that pul-verized coal is supplied into the discharging pipe directly throughthe bush. The surfaces of contact between the bush and the pipe are not subject to abrasion wear thereby eliminating uncontrolled leak-4~
age of gas therebetween.
As it is shown in Fig. 4, the discharging pipe 5 of the feeder can be provided with a supplementary side discharging door 13 disposed diametrically opposite to the first door, while the calibrated openings 12 in the bush 7 are provided in pairs and symmetrically.
The above arrangement makes it possible to carry out supplying pulverized coal into ~he bush in counter flows, thereby considerably reducing the abrasion wear of the bush~ and increas-ing the pressure gradient between the aeration chamber and the discharging pipe, and hence carrying out a more flexible and ac-curate regulation of the batch of pulverized coal being supplied to the blast furnace.
Fig. S shows a further embodiment of the invention wherein into the calibrated openings 12 of the bush 7 there are placed wear-resistant inserts 14 made of, e.g. metal ceramics. The inserts 14 are provided with conduits 15, the total area of a pair of diametrically opposite conduits l5 being O.05 to 0.20 of the cross-section of the discharging pipe 5.
As has been above specified, decreasing the total arèa of the conduits 15 below 0.05 of the cross-section area of the dis-charging pipe is undesirable since it requires increasing the po-wer of blasting means at a predetermined consumption of pulverized coal, and therefore leads to an elevated energy expenditure for aerating pulverized coal. In the case where the total area of the conduits provided within the insert~ exceeds 0.20 of the area of the discharging pipe, the batching accuracy will not be practical-ly increased due to a decrease in the pressure gradient between the aeration chamber and the discharging pipe.
The apparatus operates as follows:
An aerating gas, e.g. air, is supplied in-to the collec-tor 3 (Figs. 1, 2 and 3), the flow rate of said gas being of 5 to 15% of the flow rate of a yas transporting pulverized coal. Pul-verized coal disposed above the valve gear screen 2 within the ae-ration chamber 1, changes to the fluidized state, and with mat-ching one of the calibrated openings 12 of the bush 7 with the discharging door 6 of the discharging pipe 5, is supplied inside this pipe. During the supply of transportation gas through the opening 11 of the hollow rod 8 there starts the discharge of pul-verized coal out of the feeder to the blast furnace tuyeres.
In the embodiment of the feeder shown in Fig. 4, pro-vided with the supplementary discharging door 13 within the pipe 5, pulverized coal gets into the bush 7 in the form of counter flows, and is discharged into the discharging pipe 5 at a velo-city on the inner surface of the bush being close to zero, there-by promoting a decrease in the wear thereof. Due to this fact, a higher pressure gradient may be achieved between the chamber 1 and the discharging pipe 5, said gradient being, e.g. of 2.105 Pa, that is considerably higher than the magnitude of pressure pulsa-tions at the blast furnace tuyeres and within the pipelines which pulsation is of 1.10 to 2.104 Pa, therefore the influence of said pulsations upon the total hydraulic resistance of the system (feed-er-pipeline-tuyere) is insignifiGant. Thus, a high accuracy of bat-ching pulverized coal supplied to the blast furnace tuyeres is achieved.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An aeration feeder for supplying pulverized coal to a blast furnace comprises an aeration chamber, a valve gear screen disposed across said chamber, a discharging pipe provided with a discharging door disposed on a side surface of an end of this pipe located within the aeration chamber, a locking and re-gulating element telescopically inserted into said pipe and pro-vided with a hollow rod, said element being in the form of a rotat-ing bush provided with calibrated openings alternatively communi-cating with the discharging doors provided in the discharging pipe.
2. A feeder according to claim 1, wherein in the dis-charging pipe there is provided a supplementary discharging door diametrically opposite to said discharging door, while the cali-brated openings in the bush are disposed in pairs, symmetrically.
3. A feeder according to claim 2, wherein wear-resistant inserts provided with conduits, are placed into the calibrated openings, the total area of each pair of diametrically opposite conduits being of 0.05 to 0.20 of the cross-section of the discharging pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000390646A CA1160046A (en) | 1981-11-23 | 1981-11-23 | Aeration feeder for supplying pulverized coal to blast furnace hearth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000390646A CA1160046A (en) | 1981-11-23 | 1981-11-23 | Aeration feeder for supplying pulverized coal to blast furnace hearth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1160046A true CA1160046A (en) | 1984-01-10 |
Family
ID=4121474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000390646A Expired CA1160046A (en) | 1981-11-23 | 1981-11-23 | Aeration feeder for supplying pulverized coal to blast furnace hearth |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1160046A (en) |
-
1981
- 1981-11-23 CA CA000390646A patent/CA1160046A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |