CN202072717U - Air cooling blast furnace tuyere and air supply system thereof - Google Patents
Air cooling blast furnace tuyere and air supply system thereof Download PDFInfo
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- CN202072717U CN202072717U CN2011201596682U CN201120159668U CN202072717U CN 202072717 U CN202072717 U CN 202072717U CN 2011201596682 U CN2011201596682 U CN 2011201596682U CN 201120159668 U CN201120159668 U CN 201120159668U CN 202072717 U CN202072717 U CN 202072717U
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Abstract
The utility model discloses an air cooling blast furnace tuyere longer in service life, and further provides an air supply system of the air cooling blast furnace tuyere according to characteristics of the air cooling blast furnace tuyere. An annular bottom pressure cavity is additionally arranged, namely a shaft ring structure is arranged on a straight blowing pipe and surrounded on the periphery of the straight blowing pipe so as to dissipate cooled air sent by a cooled air source to the bottom pressure cavity, pressure of air in the peripheral direction of a cooled air conveying channel can be distributed uniformly as far as possible, and thereby the tuyere can be cooled relatively uniformly, nonuniform cooling is reduced, and partial premature failure is prevented. Therefore, the service life of the air cooling blast furnace tuyere as compared with an existing air cooling blast furnace tuyere is greatly prolonged.
Description
Technical field
The utility model is that, energy-saving and environmental protection high temperature resistant to blast-furnace tuyere in response to smelter etc. require and propose air cooling blast furnace tuyere, and the utility model has also proposed a kind of air cooling blast furnace tuyere system that uses this class air cooling blast furnace tuyere simultaneously.
Background technology
The blast-furnace tuyere Application Areas: blast-furnace tuyere is a visual plant that is applied to blast furnace ironmaking air inlet system final tache, it is installed in the furnace wall between bosh and the furnace bottom, the part leading portion stretches in the stove, directly be subjected to the hot erosion of liquid slag iron and drop the heat material, and the heavy wear of motion fine coal, lost efficacy easily, change the air port and cause blast furnace staying, reduced blast furnace ironmaking output, therefore, in the work-ing life that the improved main route of blast-furnace tuyere is to improve blast-furnace tuyere, reduce the use cost in air port, and guarantee to use and operating continuity.
Blast-furnace tuyere is the critical process spare on the iron work blast furnace, by blast-furnace tuyere high-temperature hot-air that is blown into and the fine coal that sprays into, and the generation of the coke oxidizing fire between each bed of material CO, in rising, high temperature restores the iron that existed with oxide form originally.
The environment for use of blast-furnace tuyere is exceedingly odious, not only to bear the above radiation of high temperature of about 1500 degree, also to bear the wearing and tearing with furnace charge, slag of washing away of high temperature flowing molten iron, therefore according to different blast furnace operating modes and different service requirements, economic requirements, multiple structure and surface-treated blast-furnace tuyere have been designed.
The structure of blast-furnace tuyere has: cavity water cooled tuyere, two-chamber swirl diffuser, throughflow tuyere, the air port that goes with each other all the time, centering type air port.Though blast-furnace tuyere is of a great variety, they all are the water-cooled blast-furnace tuyeres.Because of blast-furnace tuyere is to keep tuyere body to run on low-temperature condition by water cooling, keep strength and stiffness, so the purity of copper is most important, require very high to material.
The water-cooled blast-furnace tuyere mainly adopts the double-cylinder type structure simultaneously, be that inner cylinder is the high temperature air passage that enters blast furnace, the passage between urceolus and the inner core leads to water coolant, with cooling wall, the general copper product of good heat conductivity that adopts is made the air port, and outside surface also will carry out other processing again.But such structure and countermeasure must also can cause following problem: 1, water coolant is taken away a lot of heats of high furnace interior, also take away the part heat that flows through air port inner core high temperature air, reduce the utilising efficiency of heat energy, be unfavorable for energy-conservationly, do not met current Energy policy; 2, for to guarantee that blast inlet maintains lower temperature, need a large amount of water coolants, though adopt circulating technology, there is the loss of water equally, aggravated this of shortage of water resources problem in century.Use big water gaging also must cause the pollution of water simultaneously; 3, use high performance material must bring high cost, bring economically burden to the user.
China CN1609236A patent discloses a kind of air cooling blast furnace tuyere, this air port is made up of with the urceolus that is socketed on the inner core outside, logical cold wind the inner core of logical hot blast, inner tube wall, wall of the outer-rotor and blast inlet head are densely covered with some fluid orifices, and the fluid orifice of exposure is very easy to be stopped up by impurity such as scums.In order to prevent the too fast inefficacy in air port, need a large amount of cooling airs to cool off usually, it certainly will slacken the consumption that sprays into blast furnace wind from the air port central tube greatly, have a strong impact on high temperature air and wherein fine coal spray into the degree of depth of blast furnace, influence blast furnace and normally move.
For this reason, China's CN101698893A patent announces that the inwall that disclosed high-efficiency air cooling blast furnace tuyere makes up said cold air transfer passage is provided with said main jet hole and fluid orifice, the freezing air of going into from the main jet orifice flow is used for main combustible pipe is lowered the temperature along described Clearance Flow, and being mainly used to cap jet is sprayed into the gas in gap, fluid orifice carries out flow-disturbing, form turbulent flow, can play better cooling performance.On the other hand, this structure also makes said fluid orifice directly not be exposed to the outside, prevents the obstruction to fluid orifice such as scum.But the gas supply part of cold air transfer passage is divided into the cold air import in the disclosed said structure of this application, the pressure that forms inevitable inhomogeneous, cause the air port inhomogeneous cooling even, may cause local superheating, thereby can cause partial failure and cause the inefficacy in whole air port.
Summary of the invention
In view of this, the utility model provides a kind of work-ing life relatively long air cooling blast furnace tuyere, simultaneously in order to overcome existing air cooling blast furnace tuyere relatively short defective in work-ing life, according to these air cooling blast furnace tuyere characteristics, a kind of air cooling blast furnace tuyere air feed system has been proposed also.
According to the utility model, an one aspect provides a kind of air cooling blast furnace tuyere, and another aspect then provides a kind of air cooling blast furnace tuyere air feed system of this air cooling blast furnace tuyere of application, introduces the base pressure chamber, the wind regime of cooling air port is provided, therefore according to an aspect of the present utility model:
A kind of air cooling blast furnace tuyere comprises:
Belly pipe is used to carry high-temperature gas;
The air cooling housing is sleeved on described belly pipe head, makes up described belly pipe head refrigerative cold air transfer passage;
It particularly points out and is,
The rear end of described air cooling housing is provided with the annular base pressure chamber that connects the cooling source of the gas, and the rear end of described cold air transfer passage is communicated with this base pressure chamber.
According to the utility model, the return flow line of this preceding row of channels front end of connection of above-mentioned air cooling blast furnace tuyere, a kind of structure of the described cold air transfer passage preceding row of channels inboard, inferior inboard and this rear end, return flow line of outermost connection for this cold air transfer passage comprises be used for the flow-guiding channel of jet-stream wind forward.
Above-mentioned air cooling blast furnace tuyere, described return flow line comprise inboard and the back cavity described channel connection that moves ahead and the outer return flow line that is communicated with by the spurt hole that is distributed on the outer wall that makes up this back cavity, and this skin return flow line is communicated with described flow-guiding channel.
Above-mentioned air cooling blast furnace tuyere, described return flow line are pre-small post-large pyramidal structure, and described back cavity is the structure similar to this return flow line shape.
Above-mentioned air cooling blast furnace tuyere, described return flow line and described flow-guiding channel on the orientation, be positioned at described before the row of channels front portion outside, correspondingly, row of channels comprises as the annular middle part pressure chamber of the channel rear portion that moves ahead with as the cross sectional area of the channel rear portion that the moves ahead honeycomb duct less than middle part pressure chamber cross sectional area before described.
Above-mentioned air cooling blast furnace tuyere, described air cooling housing comprises:
Inner casing is with the head outer cylinder wringing fit of described belly pipe;
Middle casing, and be formed with the gap that constitutes described preceding row of channels between described inner casing, and the middle casing front portion is formed with described back cavity; And
Shell is made by the high temperature material of the used blast furnace of coupling, and cooperates the described honeycomb duct of formation with described middle casing, and inside is provided with circumferentially uniform flow-guiding channel.
According to the utility model, the another kind of form of described cold air transfer passage be described air cooling housing comprise with the friction tight inwall of belly pipe suit and with the outer wall of this inwall coaxial cooperation, form described cold air transfer passage between inwall and the outer wall, and the cold air transfer passage is separated into forward one group of sub-cold air transfer passage by the circumferential uniform fin that extends axially.
A kind of air cooling blast furnace tuyere air feed system according to another aspect of the utility model comprises:
Air cooling blast furnace tuyere, and this air cooling blast furnace tuyere comprises the belly pipe that is used to carry high-temperature gas, and be sleeved on described belly pipe head in order to make up air cooling housing to described belly pipe head refrigerative cold air transfer passage;
Hot-air channel is connected with described belly pipe, and high-temperature gas is provided;
Bypass picks out from described hot-air channel, and is provided with water cooler in this bypass, and then is communicated with described cold air transfer passage, so that cooling gas to be provided;
The rear end of described air cooling housing is provided with the annular base pressure chamber that connects the cooling source of the gas, and the rear end of described cold air transfer passage is communicated with this base pressure chamber.
Above-mentioned air cooling blast furnace tuyere air feed system, the sleeve pipe on the described belly pipe of being sleeved on that also comprises the described air cooling blast furnace tuyere of next-door neighbour, this sleeve pipe rear end is provided with the back pressure chamber that annular connects described bypass end, and is formed with the cold air access that is used to be communicated with this back pressure chamber and described bottom pressure chamber in this casing wall.
Above-mentioned air cooling blast furnace tuyere air feed system, the endoporus rear portion that described air cooling blast furnace tuyere cooperates with described belly pipe is formed with the endosphere face of a sphere ledge structure, and correspondingly, the corresponding position of described belly pipe is provided with and the facial ectosphere face that cooperates of this endosphere.
According to the utility model, introduce annular bottom pressure chamber, just be similar to the structure of establishing an axle collar on belly pipe, be looped around the circumferential of belly pipe, the cold air that the cold air source can be sent into is dispersed in the bottom pressure chamber, make the cold air transfer passage distribute even as much as possible at the gaseous tension that makes progress in week, can cool off the air port relatively uniformly, it is even to alleviate inhomogeneous cooling, prevents local too early inefficacy, thereby than existing air cooling blast furnace tuyere, prolong work-ing life greatly.
Description of drawings
Below in conjunction with Figure of description in detail the technical solution of the utility model is described in detail, those skilled in the art is better understood and realization the utility model, wherein:
Fig. 1 is the sectional structure synoptic diagram of a kind of foundation air cooling blast furnace tuyere of the present utility model.
Fig. 2 is the sectional structure synoptic diagram according to another kind of air cooling blast furnace tuyere of the present utility model.
Fig. 3 is the cross-sectional structural representation of belly pipe.
Fig. 4 is a high-temperature gas distribution pattern synoptic diagram, and wherein right-hand member is a sleeve structure.
Fig. 5 is a kind of structural representation according to air cooling blast furnace tuyere of the present utility model, omits the part that hot-air channel is connected with belly pipe.
Among the figure: 1, cold air access, 2, the bottom pressure chamber, 3, pod apertures, 4, middle part pressure chamber, 5, shell, 6, outer return flow line, 7, middle casing, 8, flow-guiding channel, 9, spurt hole, 10, flute profile spurt hole, 11, annular boss, 12, inner casing, 13, flow deflector, 14, belly pipe, 15, flow-in hole, 16, endosphere face, 17, outer wall, 18, fin, 19, inwall, 20, the belly pipe rear portion, 21, the belly pipe middle part, 22, ectosphere face, 23, the front pillar face, 24, hot-air channel, 25, bypass, 26, water cooler, 27, the back pressure chamber, 28, sleeve pipe.
Embodiment
With reference to Figure of description 5, among the figure, what hollow big arrow was represented is the trend of high-temperature gas, what small arrow was represented is the trend of cooling gas, certainly, before water cooler 26, also leave high-temperature gas in the bypass 25, only represent that here there is the path of height difference in two circulated gases temperature, high and low temperature is not made strict the qualification.
According to the utility model, referring to a kind of air cooling blast furnace tuyere air feed system shown in the Figure of description 5, comprising so:
Air cooling blast furnace tuyere, and this air cooling blast furnace tuyere comprises the belly pipe 14 that is used to carry high-temperature gas, and be sleeved on described belly pipe 14 heads in order to make up air cooling housing to described belly pipe 14 head refrigerative cold air transfer passages;
Hot-air channel 24 is connected with described belly pipe 14, and high-temperature gas is provided;
The rear end of described air cooling housing is provided with the annular base pressure chamber 2 that connects the cooling source of the gas, and the rear end of described cold air transfer passage is communicated with this base pressure chamber 2.
About housing, naturally the hot environment that will mate blast furnace selects for use resistant to elevated temperatures material to make, said high temperature material preferably has the stupalith than high structural strength and higher heat resistance, certainly, also can select refractory materials or cermet material with higher heat resistance for use.Temperature under hot environment when said high temperature is promptly smelted iron in the blast furnace.
In addition, about the high-temperature gas that stream in the belly pipe 14 has, the cooling gas that flows and have in the gentle cooled case, low temperature is a relative notion to high temperature with cooling off in other words, is not the core of this scheme herein, and two notions exist relatively.Cold air can not be too cold, otherwise, will have a strong impact on and make the air port ceramic package, in perhaps ceramic-metallic work-ing life, certainly, this is that design water cooler 26 needs the factor considered, how the temperature during the cold air ejection should determine the amplitude of lowering the temperature.
Though cold air is taken from the bypass 25 of hot-air channel 24, saying has to a certain extent seemingly increased energy consumption, if dispose the cold air transfer passage separately, real cost is high all the better, and the temperature adjustment is also more difficult.And blast furnace ironmaking is certain with air capacity, and additionally increasing source of the gas can influence blast furnace and normally move, and maybe needs to change existing operational outfit.
About the orientation, the spout end of air cooling blast furnace tuyere is a head, and anterior in other words, so opposite direction then be the rear portion, in other words the rear to, mated have bottom.
Referring to Figure of description 4, above-mentioned air cooling blast furnace tuyere system also comprises the sleeve pipe 28 on the described belly pipe 14 of being sleeved on of the described air cooling blast furnace tuyere of next-door neighbour, this sleeve pipe rear end is provided with the back pressure chamber 27 that annular connects described bypass 25 ends, and is formed with the cold air access 1 that is used to be communicated with this back pressure chamber and described bottom pressure chamber 2 in this casing wall.As previously mentioned, bypass is a branch road, and flow is limited, and the radius of air cooling blast furnace tuyere is greater than the radius of belly pipe 14, obviously also greater than the radius of bypass, the part that bypass inserts is a very little part than the transverse section in air port, and it is relatively difficult wanting cold air is uniformly dispersed.Another pressure chamber has then been introduced in the introducing of sleeve pipe 28 simultaneously, pressure chamber 27 just, as shown in Figure 4, so the cross section of Dui Ying cold air path also is an annular, more become equivalent first class pressure chamber, making cooling gas enter the air port is for the uniform relatively state of a kind of pressure, cooperates the pressure chamber of back level again, can better carry out pressure equalization.
In order to improve the structural reliability under the confined state, the endoporus rear portion that described air cooling blast furnace tuyere cooperates with described belly pipe 14 is formed with the endosphere face 16 of a sphere ledge structure, correspondingly, the corresponding position of described belly pipe is provided with and the facial ectosphere face 22 that cooperates of this endosphere, sphere contacts that not only contact area is big, and guiding, pretension and sealing when forming assembling easily.
About the air port that above-mentioned air cooling blast furnace tuyere system is adopted, its basic structure is that it comprises:
The air cooling housing is sleeved on described belly pipe 14 heads, makes up described belly pipe 14 head refrigerative cold air transfer passages;
The rear end of described air cooling housing is provided with the annular base pressure chamber 2 that connects the cooling source of the gas, and the rear end of described cold air transfer passage is communicated with this base pressure chamber 2.
Making up pressure chamber is core of the present utility model, simultaneously, has cooperated the pressure chamber of other parts settings of air cooling blast furnace tuyere system again, and the transport structure of better effects if can be provided.
As Figure of description 1 or 2, all there is bottom pressure chamber 2, it should be noted that cold air access structure is the circular channel that forms between two bodies, the front is also mentioned, gas can better all loose, as Figure of description 1 or 2, be provided with the dividing plate of uniform flow-in hole 15 between cold air access 1 and bottom pressure chamber simultaneously, be communicated with by flow-in hole, according to hydromeehanics, can form the performance of better all loosing.
With reference to Figure of description 1, what little black arrow was represented is the circulating direction of cooling gas, so corresponding, described cold air transfer passage comprises the flow-guiding channel 8 of jet-stream wind forward that is used for of the return flow line of this preceding row of channels front end of connection of inboard preceding row of channels, inferior inboard and this rear end, return flow line of outermost connection.The inboard outside here is always to represent in the footpath in air port, near central shaft be in, otherwise outside being.So formed cold air transfer passage has enough relatively length, can form good protection to the air port, has improved the work-ing life in air port greatly.
Right-hand member referring to Figure of description 1, this a part of residing environment is the most abominable, therefore, described return flow line comprises inboard and the back cavity described channel connection that moves ahead and the outer return flow line 6 that is communicated with by the spurt hole 9 that is distributed on the outer wall that makes up this back cavity, and this skin return flow line is communicated with described flow-guiding channel 8.This class formation is announced to have in Chinese CN101698893A patent and is related to, and only represents jet hole in this publication, its principle broadly similar, but structure is slightly different, has better cooling performance according to this programme.
Further, described return flow line is pre-small post-large pyramidal structure, and described back cavity is the structure similar to this return flow line shape, belong to the analog structure on how much, certainly, similar also can only be similar substantially, just get on to consider similarity from tapering, simultaneously, as shown in Figure 1, inlet front end head itself in other words also is a pyramidal structure.In fact this structure causes
Described return flow line and described flow-guiding channel on the orientation, be positioned at described before the row of channels front portion outside, correspondingly, row of channels comprises as the annular middle part pressure chamber 4 of the channel rear portion that moves ahead with as the cross sectional area of the channel rear portion that the moves ahead honeycomb duct less than middle part pressure chamber cross sectional area before described.The further pressure chamber that increases, equivalence three pressure chambers are provided, the cooling quality can better be provided.As shown in Figure 1, more be tending towards reasonable based on the said structure layout between middle part pressure chamber and the back cavity.
Further, described air cooling housing comprises:
The structure of multiple housing is easy to the processing and the assembling of internal structure, is easy to make up corresponding channel architecture.
Shown in accompanying drawing 1 right-hand member; right-hand member in the air port is provided with annular boss 11; 14 inner edges that are positioned at annular boss of belly pipe; that is to say that annular boss has made up a basin structure; the spout of belly pipe is positioned at the basin structure; the erosion of warm air is lower arround being subjected to, can the better protection belly pipe.
The uniform flute profile spurt hole 10 of nozzle exit area in the accompanying drawing 1, forming with the belly pipe axle is the annular array of axle.Can the better protection belly pipe.
Referring to Figure of description 2, it then is the another kind of air cooling blast furnace tuyere of simplifying relatively, correspondingly, described air cooling housing comprise with the friction tight inwall 19 of belly pipe 14 suits and with the outer wall 17 of this inwall coaxial cooperation, form described cold air transfer passage between inwall and the outer wall, and the cold air transfer passage is separated into forward one group of sub-cold air transfer passage by the circumferential uniform fin 18 that extends axially, structure is simple relatively, cost is low, owing to the existence in forepressure chamber, has guaranteed the homogeneity of jet-stream wind.
In addition, referring to Figure of description 2, the gap that forms between inwall 19 and the outer wall 17 occupies fully at axial 18 of unpromising fins, fin extends to front end, but the rear portion is left a space to said gap, is designated as the equivalent pressure chamber, and better cooling performance can be provided.
Claims (10)
1. air cooling blast furnace tuyere comprises:
Belly pipe (14) is used to carry high-temperature gas;
The air cooling housing is sleeved on described belly pipe (14) head, makes up described belly pipe (14) head refrigerative cold air transfer passage;
It is characterized in that,
The rear end of described air cooling housing is provided with the annular base pressure chamber (2) that connects the cooling source of the gas, and the rear end of described cold air transfer passage is communicated with this base pressure chamber (2).
2. air cooling blast furnace tuyere according to claim 1, it is characterized in that described cold air transfer passage comprises the flow-guiding channel of jet-stream wind (8) forward that is used for of the return flow line of this preceding row of channels front end of connection of inboard preceding row of channels, inferior inboard and this rear end, return flow line of outermost connection.
3. air cooling blast furnace tuyere according to claim 2, it is characterized in that, described return flow line comprises inboard and the back cavity described channel connection that moves ahead and the outer return flow line (6) that is communicated with by the spurt hole (9) that is distributed on the outer wall that makes up this back cavity, and this skin return flow line is communicated with described flow-guiding channel (8).
4. air cooling blast furnace tuyere according to claim 3 is characterized in that, described return flow line is pre-small post-large pyramidal structure, and described back cavity is the structure similar to this return flow line shape.
5. air cooling blast furnace tuyere according to claim 4, it is characterized in that, described return flow line and described flow-guiding channel on the orientation, be positioned at described before the row of channels front portion outside, correspondingly, row of channels comprises as the annular middle part pressure chamber (4) of the channel rear portion that moves ahead with as the cross sectional area of the channel rear portion that the moves ahead honeycomb duct less than middle part pressure chamber cross sectional area before described.
6. air cooling blast furnace tuyere according to claim 5 is characterized in that, described air cooling housing comprises:
Inner casing (12) is with the head outer cylinder wringing fit of described belly pipe (14);
Middle casing (7), and be formed with the gap that constitutes described preceding row of channels between described inner casing, and the middle casing front portion is formed with described back cavity; And
Shell (5) is made by the high temperature material of the used blast furnace of coupling, and cooperates the described honeycomb duct of formation with described middle casing, and inside is provided with circumferentially uniform flow-guiding channel (8).
7. described air cooling blast furnace tuyere according to claim 1, it is characterized in that, described air cooling housing comprise with the friction tight inwall of belly pipe (14) suit (19) and with the outer wall (17) of this inwall coaxial cooperation, form described cold air transfer passage between inwall and the outer wall, and the cold air transfer passage is separated into forward one group of sub-cold air transfer passage by the circumferential uniform fin (18) that extends axially.
8. air cooling blast furnace tuyere air feed system comprises:
Air cooling blast furnace tuyere, and this air cooling blast furnace tuyere comprises the belly pipe (14) that is used to carry high-temperature gas, and be sleeved on described belly pipe (14) head in order to make up air cooling housing to described belly pipe (14) head refrigerative cold air transfer passage;
Hot-air channel (24) is connected with described belly pipe (14), and high-temperature gas is provided;
Bypass (25) picks out from described hot-air channel, and is provided with water cooler (26) in this bypass, and then is communicated with described cold air transfer passage, so that cooling gas to be provided;
It is characterized in that:
The rear end of described air cooling housing is provided with the annular base pressure chamber (2) that connects the cooling source of the gas, and the rear end of described cold air transfer passage is communicated with this base pressure chamber (2).
9. air cooling blast furnace tuyere air feed system according to claim 8, it is characterized in that, the sleeve pipe (28) on the described belly pipe (14) of being sleeved on that also comprises the described air cooling blast furnace tuyere of next-door neighbour, this sleeve pipe rear end is provided with annular and connects the terminal back pressure chamber (27) of described bypass (25), and is formed with the cold air access (1) that is used to be communicated with this back pressure chamber and described bottom pressure chamber (2) in this casing wall.
10. according to Claim 8 or 9 described air cooling blast furnace tuyere air feed systems, it is characterized in that, the endoporus rear portion that described air cooling blast furnace tuyere cooperates with described belly pipe (14) is formed with the endosphere face (16) of a sphere ledge structure, correspondingly, the corresponding position of described belly pipe is provided with and the facial ectosphere face (22) that cooperates of this endosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011201596682U CN202072717U (en) | 2011-05-19 | 2011-05-19 | Air cooling blast furnace tuyere and air supply system thereof |
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| CN2011201596682U CN202072717U (en) | 2011-05-19 | 2011-05-19 | Air cooling blast furnace tuyere and air supply system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212632A (en) * | 2011-05-19 | 2011-10-12 | 济南大学 | Air-cooled blast-furnace tuyere and air supply system thereof |
-
2011
- 2011-05-19 CN CN2011201596682U patent/CN202072717U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212632A (en) * | 2011-05-19 | 2011-10-12 | 济南大学 | Air-cooled blast-furnace tuyere and air supply system thereof |
| CN102212632B (en) * | 2011-05-19 | 2013-01-02 | 济南大学 | Air-cooled blast-furnace tuyere and air supply system thereof |
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Granted publication date: 20111214 Effective date of abandoning: 20130306 |
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