CN204824937U - Modified blast furnace coal powder injection jar - Google Patents
Modified blast furnace coal powder injection jar Download PDFInfo
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- CN204824937U CN204824937U CN201520600164.8U CN201520600164U CN204824937U CN 204824937 U CN204824937 U CN 204824937U CN 201520600164 U CN201520600164 U CN 201520600164U CN 204824937 U CN204824937 U CN 204824937U
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- powder injection
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Abstract
The utility model relates to a modified blast furnace coal powder injection jar belongs to blast furnace coal powder injection technical field. Go up in the coal powder injection jar tank body and be equipped with down pyramis fluidization hole between pyramis fluidization hole and the fluid bed, go up and be equipped with steady voltage fluidization hole between pyramis fluidization hole and the fluidization board, coal lower valve portion connects the nitrogen purging pipe down, installs the nitrogen purging valve on it, it installs accelerating device in hand valve and the metal flexible coupling in the middle of the valve of producing coal to produce coal, installation nitrogen gas blowback pipe on tub body that produces coal in the middle of valve and the coal supply valve produces coal, return the gaseous filter screen of installation on the tube cell. Utilize the device to jet including the process of diffusing, the process of fillling coal, pressurize fluidization process and jetting steady voltage process control, the utility model provides an in the background art insufficient, the inequality of producing coal of coal powder injection jar fluidization, the unstable scheduling problem of speed, improved the rate of accuracy and even rate of coal powder injection, the consumption that has reduced the gaseous energy simultaneously damages with equipment, the indirectness has improved the blast furnace coal and has compared, has reduced the coke ratio, has improved the process flow of coal powder injection system, has improved the jetting coefficient of stabilization.
Description
Technical field
The utility model relates to a kind of pulverized coal injection tank and blowing method of improvement, belongs to technical field of blast furnace coal.
Background technology
The many employings of pulverized coal injection tank continuously every flow pattern to ensure that blast furnace does not stop coal, the winding-up of A tank time=B tank diffuses time+B+B tank of canned coal time+B tank waiting time pressurising time.Coal dust is accurately jetted equably and is conducive to stable blast furnace operating and blast furnace temperature control, can improve coal combustion rate simultaneously, improve blast furnace coal ratio, reduce coke ratio.In coal powder injection tank, whether the quality of powder fluidized to decide coal dust conveying smooth and easy, and especially from coal powder injection tank to the conveying of this segment distance of air compensation regulator, during conveying weak effect, injection rate will fluctuation, even stops coal, affects blast furnace and normally smelt.At present, most enterprises pulverized coal injection tank as shown in Figure 1, mainly comprise the Pulverized Coal Bin by being interconnected communicating pipe and coal powder injection tank, install lower coal valve and coal feeding valve communicating pipe respectively, the back powder pipe of straight-through Pulverized Coal Bin is provided with between lower coal valve and coal feeding valve, diffuse greatly, in diffuse and be located at coal powder injection tank top with little diffusing, fluidized plate is provided with successively from top to bottom in coal powder injection tank, fluidisation hole, upper tapering, fluidized-bed and bottom fluidization hole, fluidisation hole, upper tapering, bottom fluidization hole respectively with upper tapering fluidisation pipe, bottom fluidization pipe connects, upper tapering fluidisation pipe and bottom fluidization pipe body install tapering fluidisation valve and bottom fluidization valve respectively, coal powder injection tank coal output pipe body installs the hand valve that produces coal from left to right successively, metal is flexible coupling, produce coal valve and coal supply valve, large pressurising pipe is installed on coal powder injection tank top, it installs large equalizer valve, the coal powder injection tank of this kind of structure adopts the mode of top pressurising, and pressurising airshed is large, and the coal dust in coal powder injection tank is compacted from top, and bottom fluidization, upper tapering fluidisation be just unlatching when jetting, and in tank, coal dust fails abundant fluidisation, can not ensure the index of stability of pulverized coal injection, in addition, the coal injection system of this kind of structure also has following weak point: in (1) winding-up process, and the pressure change of coal powder injection tank is comparatively large, causes speed fluctuation, affects the ventilation property of the blast furnace bed of material, (2) in direct blowing process, due to the easy scaffold in Pulverized Coal Bin feed opening place, the time of coalingging is longer, and the pressurising time is forced to shorten, and affects the fluidisation of coal dust in coal powder injection tank, (3) coal powder injection tank coal outlet belongs to Condensed transportation to this segment distance of air compensation regulator, and conveying effect is poor, easy blocking pipe, (4) back powder pipe easily blocks, and impact is weighed, and in the process of coalingging, especially affects another tank of this series weigh, cause coal powder injection rate fluctuation, (5) equipment easily grinds Lou, damages, and Gas Energy Source consumption is large, and waste is serious.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of pulverized coal injection tank and blowing method of improvement, by the improvement to coal powder injection jar structure, corresponding change blowing process, realize promoting powder fluidized effect, improve the evening ratio of coal powder injection and the object of accuracy rate, reduce rate fluctuation and the structure deteriorate of breeze blowing simultaneously, solve background technology defect.
Technical solutions of the utility model are:
A kind of pulverized coal injection tank of improvement, formation comprises Pulverized Coal Bin by being interconnected communicating pipe and coal powder injection tank, install lower coal valve and coal feeding valve communicating pipe respectively, the back powder pipe of straight-through Pulverized Coal Bin is provided with between lower coal valve and coal feeding valve, coal powder injection tank top is provided with diffuses greatly, in diffuse and diffuse with little, fluidized plate is provided with successively from top to bottom in coal powder injection tank, fluidisation hole, upper tapering, fluidized-bed and bottom fluidization hole, fluidisation hole, upper tapering, bottom fluidization hole respectively with upper tapering fluidisation pipe, bottom fluidization pipe connects, upper tapering fluidisation pipe and bottom fluidization pipe body install tapering fluidisation valve and bottom fluidization valve respectively, coal powder injection tank coal output pipe body installs the hand valve that produces coal from left to right successively, metal is flexible coupling, produce coal valve and coal supply valve, large pressurising pipe is installed on coal powder injection tank top, it installs large equalizer valve, its improvements are: be above provided with hypocone fluidisation hole between fluidisation hole, tapering and fluidized-bed in coal powder injection tank, voltage stabilizing fluidisation hole is provided with between fluidisation hole, upper tapering and fluidized plate, hypocone fluidisation hole is connected with hypocone fluidisation pipe and voltage stabilizing fluidisation pipe respectively with voltage stabilizing fluidisation hole, and hypocone fluidisation pipe and voltage stabilizing fluidisation pipe body install hypocone fluidisation valve and voltage stabilizing fluidisation valve respectively, lower coal valve bottom connects nitrogen sparge tube, and it installs nitrogen purge valve, produce coal hand valve and the metal produced coal in the middle of valve is flexible coupling middle installation booster machinery, the coal output pipe body produced coal in the middle of valve and coal supply valve installs nitrogen anti-blowpipe, installation nitrogen back-flushing valve it on, installing gas filter screen on back powder pipe.
The pulverized coal injection tank of above-mentioned a kind of improvement, fluidisation hole, described upper tapering is 4, is positioned at two orthogonal diameter end points of the same circumference at height 1500mm ~ 1700mm place at the bottom of distance coal powder injection tank tank; Described hypocone fluidisation hole is 2, is positioned at the end points of a diameter of the same circumference in height 600mm ~ 800mm place at the bottom of distance coal powder injection tank tank; Described bottom fluidization hole is 2, is positioned at the end points of the same circumference diameter apart from coal powder injection tank axis vertical range 150mm ~ 170mm; Described voltage stabilizing fluidisation hole is 1, vertical range 2500mm ~ 3000mm at the bottom of coal powder injection tank tank; Described fluidized-bed is positioned at vertical range 300mm ~ 500mm place at the bottom of distance coal powder injection tank tank;
The pulverized coal injection tank of above-mentioned a kind of improvement, described in be installed on produce coal hand valve and the valve intermediate metal that produces coal be flexible coupling in the wear-resisting alloy pipe of booster machinery to be two ends be bell mouth shape; Described nitrogen anti-blowpipe is the ell of outlet towards coal supply valve, and caliber is less than coal output pipe caliber.
The method utilizing the utility model pulverized coal injection tank to carry out breeze blowing comprise diffuse process control, process control of coalingging, pressurising fluid mapper process control and winding-up voltage stabilizing process control operation:
The described process of diffusing is: first open littlely to diffuse, in diffuse coal powder injection tank tank internal pressure unloaded to 0.25Mpa ~ 0.30Mpa, then open to diffuse greatly pressure all drawn off;
The described process of coalingging is: first open coal feeding valve, opens lower coal valve and nitrogen purge valve after 7s ~ 10s, after the canned 15t ~ 20t coal dust of coal powder injection, first close lower coal valve and nitrogen purge valve, after 23s ~ 30s, close coal feeding valve, ensure that coal dust did not remain in communicating pipe, afterwards, close large diffusion valve and in diffuse;
Described pressurising fluid mapper process is: close coal supply valve, open the valve that produces coal, nitrogen back-flushing valve, upper tapering fluidisation valve, hypocone fluidisation valve and bottom fluidization valve and carry out pressurising fluidisation, and adjustment nitrogen flow, makes Q
on: Q
under: Q
the end: Q
instead=5:5:6:6(Q
onnitrogen flow in the fluidisation pipe of-upper tapering; Q
undernitrogen flow in-hypocone fluidisation pipe; Q
the endnitrogen flow in-bottom fluidization pipe; Q
insteadnitrogen flow in-nitrogen anti-blowpipe);
Described winding-up voltage stabilizing process is: open the valve that produces coal, coal supply valve, upper tapering fluidisation valve, hypocone fluidisation valve, bottom fluidization valve and nitrogen back-flushing valve, close diffuse greatly and in diffuse, little diffusing regulates automatically with the difference of voltage stabilizing fluidisation valve according to actual tank pressure and setting tank pressure, regulative mode is: when actual tank pressure is higher than setting tank pressure 0.06Mpa ~ 0.08Mpa, little diffusing is opened, when both are equal, littlely diffuse closedown; When actual tank pressure is lower than setting tank pressure 0.06Mpa ~ 0.08Mpa, voltage stabilizing fluidisation valve is opened, and when both are equal, voltage stabilizing fluidisation valve cuts out.
The beneficial effects of the utility model are:
The nitrogen sparge tube that the utility model is installed can effectively be avoided because under scaffold, coal threshold switch is not in place, and shorten the time of coalingging, for pressurising fluidisation has got the time, after including automatic routine in, the time of coalingging shortens to 1 ~ 1.5min by 8 ~ 10min; Be installed on coal output pipe metal be flexible coupling in booster machinery play a part to accelerate coal dust flowing, stable winding-up, too increase the work-ing life be flexible coupling simultaneously; Nitrogen anti-blowpipe makes coal dust more fully fluidisation in pressurising fluid mapper process, is beneficial to stable winding-up, can accelerate coal dust flowing in winding-up process; Be installed on gas filter screen on back powder pipe in the process of coalingging, only allow gas to pass through, coal dust falls back coal powder injection tank, and after avoiding back powder line clogging, impact is weighed, and namely reduces the rate fluctuation of generation when coalingging.
The utility model solves the problems such as coal powder injection tank fluidisation in background technology is insufficient, inequality of producing coal, speed are unstable, improve accuracy rate and the evening ratio of coal powder injection, reduce consumption and the structure deteriorate of Gas Energy Source simultaneously, indirectly improve blast furnace coal ratio, reduce coke ratio.Improve the technical process of coal injection system, improve winding-up index of stability, stopped because coal powder injection rate fluctuation causes the situation of blast furnace checking, for blast furnace direct motion steady in a long-term creates favourable condition.Along with injecting coal quantity progressively becomes large, upper tapering fluidisation, hypocone fluidisation, bottom fluidization, blowback nitrogen tolerance are progressively strengthened, has caught up with blast fumance rhythm, met production requirement.
Accompanying drawing explanation
Fig. 1 is tank schematic diagram of jetting in prior art;
Fig. 2 is the utility model winding-up tank schematic diagram;
Fig. 3 is booster machinery schematic diagram;
Be labeled as in figure: Pulverized Coal Bin 1, coal powder injection tank 2, communicating pipe 3, lower coal valve 4, coal feeding valve 5, back powder pipe 6, diffuse 7 greatly, in diffuse 8, littlely diffuse 9, fluidized plate 10, fluidisation hole, upper tapering 11, fluidized-bed 12, bottom fluidization hole 13, upper tapering fluidisation pipe 14, bottom fluidization pipe 15, upper tapering fluidisation valve 16, bottom fluidization valve 17, coal output pipe 18, produce coal hand valve 19, metal is flexible coupling 20, produce coal valve 21, coal supply valve 22, large pressurising pipe 23, large equalizer valve 24, hypocone fluidisation hole 25, voltage stabilizing fluidisation hole 26, hypocone fluidisation pipe 27, voltage stabilizing fluidisation pipe 28, hypocone fluidisation valve 29, voltage stabilizing fluidisation valve 30, nitrogen sparge tube 31, nitrogen purge valve 32, booster machinery 33, nitrogen anti-blowpipe 34, nitrogen back-flushing valve 35, gas filter screen 36.
Embodiment
Fig. 2-Fig. 3 shows, the pulverized coal injection tank of a kind of improvement of the utility model, formation comprises the Pulverized Coal Bin 1 and coal powder injection tank 2 that are interconnected by communicating pipe 3, installs lower coal valve 4 and coal feeding valve 5 communicating pipe 3 respectively, lower coal valve 4 bottom connects nitrogen sparge tube 31, and it installs nitrogen purge valve 32, the back powder pipe 6 of straight-through Pulverized Coal Bin 1 is provided with, installing gas filter screen 36 on back powder pipe 6 between lower coal valve 4 and coal feeding valve 5, coal powder injection tank 2 top is provided with diffuses 7 greatly, in diffuse 8 and littlely diffuse 9, fluidized plate 10 is provided with successively from top to bottom in coal powder injection tank 2, voltage stabilizing fluidisation hole 26, fluidisation hole, upper tapering 11, hypocone fluidisation hole 25, fluidized-bed 12 and bottom fluidization hole 13, voltage stabilizing fluidisation hole 26, fluidisation hole, upper tapering 11, hypocone fluidisation hole 25, bottom fluidization hole 13 respectively with voltage stabilizing fluidisation pipe 28, upper tapering fluidisation pipe 14, hypocone fluidisation pipe 27, bottom fluidization pipe 15 connects, voltage stabilizing fluidisation pipe 28, upper tapering fluidisation pipe 14, hypocone fluidisation pipe 27, bottom fluidization pipe 15 is installed respectively voltage stabilizing fluidisation valve 30, upper tapering fluidisation valve 16, hypocone fluidisation valve 29 and bottom fluidization valve 17, coal powder injection tank coal output pipe 18 body is installed from left to right successively produce coal hand valve 19, metal are flexible coupling 20, produce coal valve 21 and coal supply valve 22, metal is flexible coupling in 20 and installs booster machinery 33, booster machinery 33 for two ends be the wear-resisting alloy pipe of bell mouth shape, coal output pipe 18 body produced coal in the middle of valve 21 and coal supply valve 22 installs nitrogen anti-blowpipe 34, and it installs nitrogen back-flushing valve 35, and nitrogen anti-blowpipe 34 is export the ell towards coal supply valve 22, and its caliber is less than the caliber of coal output pipe 18, large pressurising pipe 23 is installed on the top of coal powder injection tank 2, and it installs large equalizer valve 24.
Fig. 2 shows, and on the utility model, tapering fluidisation hole 11 is 4, is positioned at two orthogonal diameter end points of the same circumference in height 1500mm ~ 1700mm place at the bottom of distance coal powder injection tank 2 tank; Hypocone fluidisation hole 25 is 2, is positioned at the end points of a diameter of the same circumference in height 600mm ~ 800mm place at the bottom of distance coal powder injection tank tank; Bottom fluidization hole 13 is 2, is positioned at the end points of the same circumference diameter apart from coal powder injection tank 2 axis vertical range 150mm ~ 170mm; Voltage stabilizing fluidisation hole 26 is 1, vertical range 2500mm ~ 3000mm at the bottom of coal powder injection tank 2 tank; Fluidized-bed 12 is positioned at vertical range 300mm ~ 500mm place at the bottom of distance coal powder injection tank tank.
The method utilizing the utility model to carry out breeze blowing is: comprise and diffuse process control, to coaling process control, pressurising fluid mapper process controls and winding-up voltage stabilizing process control operation, diffuse in process, because tank internal pressure when coal powder injection tank 2 works is 0.6Mpa ~ 0.7Mpa, diffuse that too fast generation impulse force is excessive causes coal powder injection rate fluctuation, and equipment attrition is serious, diffused and cause slowly diffusing overlong time, affect pressurising fluid mapper process sequence of control, take into account two aspects to consider, diffusing Process control measures is: first open little diffusing, in diffuse tank internal pressure unloaded to 0.25Mpa ~ 0.30Mpa, open again to diffuse greatly and pressure is all drawn off,
To coaling process control: first open coal feeding valve, after 7s ~ 10s, open lower pulverized coal valve and nitrogen purge valve, after the canned 15t ~ 20t coal dust of coal powder injection, first close lower coal valve and nitrogen purge valve, after 23s ~ 30s, close coal feeding valve, ensure that coal dust did not remain in communicating pipe, afterwards, close large diffusion valve and in diffuse; In the process of coalingging, be installed on gas filter screen 36 on back powder pipe 6 and allow gas to pass through, coal dust falls back coal powder injection tank 2, affects and weighs, can reduce the rate fluctuation of generation when coalingging after avoiding back powder pipe 6 line clogging.
Pressurising fluid mapper process controls: close coal supply valve 22, open the valve 21 that produces coal, nitrogen back-flushing valve 35, upper tapering fluidisation valve 16, hypocone fluidisation valve 29 and bottom fluidization valve 17 and carry out pressurising fluidisation, and adjustment nitrogen flow, makes Q
on: Q
under: Q
the end: Q
instead=5:5:6:6(Q
onnitrogen flow in the fluidisation pipe of-upper tapering; Q
undernitrogen flow in-hypocone fluidisation pipe; Q
the endnitrogen flow in-bottom fluidization pipe; Q
insteadnitrogen flow in-nitrogen anti-blowpipe); Due to blowback nitrogen, any air-flow is not symmetrical with other, makes coal dust more fully fluidisation, is beneficial to stable winding-up.
Winding-up voltage stabilizing process control: open the valve 21 that produces coal, coal supply valve 22, upper tapering fluidisation valve 16, hypocone fluidisation valve 29, bottom fluidization valve 17 and nitrogen back-flushing valve 35, close diffuse greatly 7 and in diffuse 8, little diffuse 9 and voltage stabilizing fluidisation valve 30 according to actual tank pressure and setting tank pressure difference automatically regulate: when actual tank pressure higher than setting tank pressure 0.06Mpa ~ 0.08Mpa time, littlely diffuse 9 and open, when both are equal, littlely diffuse 9 closedowns; When actual tank pressure is lower than setting tank pressure 0.06Mpa ~ 0.08Mpa, voltage stabilizing fluidisation valve 30 is opened, when both are equal, voltage stabilizing fluidisation valve 30 cuts out, in winding-up process, the tank pressure of coal powder injection tank 2 is 0.6Mpa ~ 0.7Mpa, and blowback nitrogen pressure is greater than the tank pressure of coal powder injection tank 2, open produce coal valve 21 and coal supply valve 22, blowback nitrogen can accelerate coal dust flowing and stable winding-up.
Claims (3)
1. the pulverized coal injection tank improved, formation comprises the Pulverized Coal Bin (1) and coal powder injection tank (2) that are interconnected by communicating pipe (3), install lower coal valve (4) and coal feeding valve (5) communicating pipe (3) respectively, the back powder pipe (6) of straight-through Pulverized Coal Bin (1) is provided with between lower coal valve (4) and coal feeding valve (5), coal powder injection tank (2) top is provided with diffuses greatly (7), in diffuse (8) and littlely to diffuse (9), fluidized plate (10) is provided with from top to bottom successively in coal powder injection tank (2), fluidisation hole, upper tapering (11), fluidized-bed (12) and bottom fluidization hole (13), fluidisation hole, upper tapering (11), bottom fluidization hole (13) respectively with upper tapering fluidisation pipe (14), bottom fluidization pipe (15) connects, upper tapering fluidisation pipe (14) and bottom fluidization pipe (15) body install tapering fluidisation valve (16) and bottom fluidization valve (17) respectively, coal powder injection tank (2) coal output pipe (18) body installs the hand valve (19) that produces coal from left to right successively, metal is flexible coupling (20), produce coal valve (21) and coal supply valve (22), large pressurising pipe (23) is installed on coal powder injection tank (2) top, it installs large equalizer valve (24), it is characterized in that: in coal powder injection tank (2) tank body, be above provided with hypocone fluidisation hole (25) between fluidisation hole, tapering (11) and fluidized-bed (12), voltage stabilizing fluidisation hole (26) is provided with between fluidisation hole, upper tapering (11) and fluidized plate (10), hypocone fluidisation hole (25) is connected with hypocone fluidisation pipe (27) and voltage stabilizing fluidisation pipe (28) respectively with voltage stabilizing fluidisation hole (26), and hypocone fluidisation pipe (27) and voltage stabilizing fluidisation pipe (28) body install hypocone fluidisation valve (29) and voltage stabilizing fluidisation valve (30) respectively, lower coal valve (4) bottom connects nitrogen sparge tube (31), it is installed nitrogen purge valve (32), the metal produced coal in the middle of hand valve (19) and the valve that produces coal (21) is flexible coupling in (20) and installs booster machinery (33), coal output pipe (18) body produced coal in the middle of valve (21) and coal supply valve (22) installs nitrogen anti-blowpipe (34), installation nitrogen back-flushing valve (35) it on, the upper installing gas filter screen (36) of back powder pipe (6).
2. the pulverized coal injection tank of a kind of improvement as claimed in claim 1, is characterized in that: fluidisation hole, described upper tapering is (11) 4, is positioned at two orthogonal diameter end points of the same circumference at height 1500mm ~ 1700mm place at the bottom of distance coal powder injection tank (2) tank; Described hypocone fluidisation hole (25) is 2, is positioned at the end points of a diameter of the same circumference in height 600mm ~ 800mm place at the bottom of distance coal powder injection tank (2) tank; Described bottom fluidization hole (13) is 2, is positioned at the end points of the same circumference diameter apart from coal powder injection tank (2) axis vertical range 150mm ~ 170mm; Described voltage stabilizing fluidisation hole (26) is 1, vertical range 2500mm ~ 3000mm at the bottom of coal powder injection tank (2) tank; Described fluidized-bed (12) is positioned at vertical range 300mm ~ 500mm place at the bottom of distance coal powder injection tank (2) tank.
3. the pulverized coal injection tank of a kind of improvement as claimed in claim 1, is characterized in that: described in be installed on booster machinery (33) that produce coal hand valve (19) and the valve that produces coal (21) intermediate metal be flexible coupling in (20) for two ends be the wear-resisting alloy pipe of bell mouth shape; Described nitrogen anti-blowpipe (34) is the ell of outlet towards coal supply valve (22), and caliber is less than coal output pipe (18) caliber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520600164.8U CN204824937U (en) | 2015-08-11 | 2015-08-11 | Modified blast furnace coal powder injection jar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520600164.8U CN204824937U (en) | 2015-08-11 | 2015-08-11 | Modified blast furnace coal powder injection jar |
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| CN204824937U true CN204824937U (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520600164.8U Withdrawn - After Issue CN204824937U (en) | 2015-08-11 | 2015-08-11 | Modified blast furnace coal powder injection jar |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177201A (en) * | 2015-08-11 | 2015-12-23 | 邯钢集团邯宝钢铁有限公司 | Improved blast furnace coal injection tank and injection method |
| CN115094170A (en) * | 2022-06-10 | 2022-09-23 | 青岛恒拓环保科技有限公司 | Control method of fluidized gas of blast furnace coal injection tank |
-
2015
- 2015-08-11 CN CN201520600164.8U patent/CN204824937U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177201A (en) * | 2015-08-11 | 2015-12-23 | 邯钢集团邯宝钢铁有限公司 | Improved blast furnace coal injection tank and injection method |
| CN105177201B (en) * | 2015-08-11 | 2017-04-12 | 邯钢集团邯宝钢铁有限公司 | Improved blast furnace coal injection tank and injection method |
| CN115094170A (en) * | 2022-06-10 | 2022-09-23 | 青岛恒拓环保科技有限公司 | Control method of fluidized gas of blast furnace coal injection tank |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151202 Effective date of abandoning: 20170412 |
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| AV01 | Patent right actively abandoned |