CN1058807A - The afterfire method and apparatus - Google Patents
The afterfire method and apparatus Download PDFInfo
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- CN1058807A CN1058807A CN 91108513 CN91108513A CN1058807A CN 1058807 A CN1058807 A CN 1058807A CN 91108513 CN91108513 CN 91108513 CN 91108513 A CN91108513 A CN 91108513A CN 1058807 A CN1058807 A CN 1058807A
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- oxidizing gas
- afterfire
- vortex
- air port
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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Abstract
The method and apparatus that is used for the reactant gases afterfire, promptly the oxidizing gas jet by means of one vortex injection at least makes the reactant gases that produces in the iron bath in this afterfire above molten bath, and change consequent energy over to this pond, wherein spray one or more strands of oxidizing gas jets to the pool surface vortex by one or more air ports, perhaps, spray one or more strands of oxidizing gas jets to pool surface with hollow vortex jet by one or more air ports.
Description
The present invention relates to be used for the method and apparatus of reactant gases afterfire, particularly add the method and apparatus of the reactant gases afterfire of the reactant generation in iron and the ferric oxide molten bath.
The reactant that adds the molten bath is carbonaceous material (coal commonly used) and oxidizing gas (air commonly used and oxygen).Reactant adds the molten bath by the air port at bottom or top, also can add from two air ports simultaneously.The reactant gases that produces mainly is carbon monoxide and hydrogen, and these reactant gasess carry out afterfire with oxidizing gas on smelting iron, and the energy that afterfire produces changes iron bath over to.
Latest developments from the method for ferric oxide ironmaking, the reducing iron oxides energy needed is from the energy that oxidation discharged of the reactant gases that generates in the molten bath in the molten bath.Reactant gases comprises carbon monoxide and hydrogen.With regard to carbon, when oxidation of coal becomes carbon monoxide, only discharge 15% energy, dump energy will just discharge when carbon monoxide is oxidized to carbonic acid gas.So preferably the carbon monoxide after-burning can be burnt till carbonic acid gas, the heat energy of generation is mainly used in iron oxide reduction Cheng Tie.Yet in steel-making, can be reliably and repeatedly carry out afterfire, the afterfire level of expeditiously heat energy that produces being given to the molten bath simultaneously is also very low.
The method and apparatus that the purpose of this invention is to provide a kind of afterfire, can reliably and repeatedly carry out the afterfire of predetermined extent with this method and apparatus, therefore the reliability (even reliable equally when the afterfire of high level) that keeps operation simultaneously makes the process such as melting and reducing, coal gasification of steel-making, iron ore or pre-reduced iron ore and the integrated application process cost of this area reduce.
First aspect of the present invention provides a kind of method and apparatus of reactant gases afterfire, wherein, reactant is added in the iron bath, make the reactant gases that generates thus carry out afterfire by means of one oxidizing gas jet at least on top, molten bath, and with consequent energy efficient rate change the molten bath over to.The method is characterized in that as mentioned above and spray one or more strands of oxidizing gas jets to the weld pool surface vortex with one or more air ports.
Find: utilizing the jet formation vortex of oxidizing gas is term moment of momentum in the hydromeehanics, can greatly improve the afterfire of the reactant gases that generates in the molten bath, particularly can increase the reliability and the repeatability of selected afterfire, bring many advantages so just for the afterfire method of reactant gases.
The implication of " moment of momentum " is an oxidizing gas effusive tangential component herein; The implication of " vortex number " is the ratio of tangential momentum and axial pneumatic amount.
The outlet in one or more air ports can be common structure, and promptly the circular section also can be other any geometricdrawing, even can be divided into several exits.
Can make one or more strands of oxidizing gas jets form vortex by any means or method.For example, in fact, in the upstream of the exit passageway in one or more air ports guide plate is installed or liner is successful, also can be arranged many outlets with same gradient, can cause the oxidizing gas jet to have tangential component like this, promptly have vortex in same direction.One or more air ports also can have following structure: the upstream end in outlet has a cell, and this cell receives the oxidizing gas of tangential direction, thereby makes the oxidizing gas jet have moment of momentum.
According to a first aspect of the present invention, under the identical situation of other condition, with commonly used " free style " non-vortex jet paraffin oxidation gas ratio, might provide 10% with afterfire efficient.For example, the someone finds: the air port that with diameter is the 150mm round exit is at 1200 ℃, with about 130NM
3/ minute flow velocity absence of vortices jet paraffin oxidation gas, can produce 30% afterfire, be added on oxidizing gas and just can reach 45% afterfire and will quite hang down vortex (being that the vortex number is 0.2).
Can one or more strands of oxidizing gas jets be sprayed to the weld pool surface vortex any vortex number.Yet optimal operational condition is the vortex number is 0.1-5, is preferably 0.1-2.
The feature of first aspect present invention is: on the one hand, the afterfire degree in the reaction tank can be adjusted to the operational condition of requirement; On the other hand, also this operating process of may command, the particularly energy in control input molten bath.For example, use single air port, only by changing the vortex number, just can be reliably and repeatedly afterfire is controlled at the scope of 35-80%, the while does not influence the transfer of high calorie to the molten bath.
The setting angle in one or more air ports and highly have range of choice widely is 10 °-90 ° to the angle of static weld pool surface, is preferably 30 °-90 °.Correspondingly, the distance of above-mentioned one or more strands of oxidizing gas jets in the gas reactor space also differs widely.Certainly, the length of this distance influences the size of oxidizing gas to the weld pool surface impact area.Should consider the geometrical shape and the working method itself of reactor as for mounting height.For example, in the method for making steel of bottom blowing, should select the mounting height higher slightly, because the feature of bottom blowing steelmaking process is violent boiling and injection than other method.But with regard to the known free jet paraffin oxidation gas that does not have a vortex, the air port mounting height is 2 meters above the weld pool surface of calmness at least, and the air port mounting height that the present invention has vortex to spray is not subjected to above-mentioned distance limit.When carrying out melting and reducing with drum-shaped reactor, under the melting pool surface, not only add ore and combustionmaterial, and oxidizing gas sprays into from the top mainly, therefore can select short vortex to spray distance.Finding, is successful at the weld pool surface of calmness and the distance between the outlet of air port for about 0.5-10m.
About the selection of the oxidizing gas that sprays with one or more air ports basically without limits, this oxidizing gas can be an oxygen, air or oxygen and rare gas element CO
2And/or H
2The mixture of O and the mixture of any aforementioned gas.
And preferably the preheat oxygen oxidizing gases is with the whole thermal equilibrium in the improvement process (smelting reduction process).Is possible with the waste gas in the thermal process by the heat exchanger heats oxidizing gas that is fit to.With regard to the method for first aspect present invention, use 1000 °-1600 ℃ preheated air beneficial especially.
A second aspect of the present invention provides a kind of method and apparatus of reactant gases afterfire, wherein reactant is added iron bath, the reactant gases that generates carries out afterfire by means of oxidizing gas on top, molten bath, transfers to the energy efficient rate of Chan Shenging the molten bath therefrom.This method is characterised in that by one or several air ports at least one form of spraying with hollow sprays to weld pool surface with oxidizing gas.
Find: for realizing high efficiency reactant gases afterfire and the molten bath is transferred on consequent energy efficient rate ground, be an important factor with the form jet paraffin oxidation gas of hollow injection; When particularly spraying the oxidizing gas of certain flow rate with air port with certain cross-sectional area outlet, it is that circular air port compares that outlet can be formed air port that hollow sprays and outlet, and the former afterfire and energy all have unexpected high-level efficiency to the transfer in molten bath.
A second aspect of the present invention does not limit the hollow of simple form and sprays, and when the hollow taper that forms when gas sprays by a ring-type air port with solid core, but a second aspect of the present invention relates to any type of hollow injection.These forms comprise any geometrical shape in ring-type slot air port, as circle, and ellipse, any curved shape and dihedral such as trilateral, rectangle, parallelogram and Polygons.Above-mentioned all structures generally include fixed or inner core movably.The ring-type slot also can be interrupted, or is divided into independently several parts.For example can directly arrange several air ports abreast or they are arranged in the predetermined position of the geometric centre of Any shape.Also the proof ring-type slot that has the ring-type slot of mesospore (as support) or the guide plate that influences air-flow is housed also is successful.
Available two or windy mouth is realized the hollow gas injection.For example, desire is delivered to the air port respectively with different gas, is mixed gas when ejection only, then available windy mouthful.
First and second aspects of the present invention can be combined, with hollow jet vortex jet paraffin oxidation gas, the vortex number is preferably 0.1-5.0.
In melting and reducing, preheating of air to about 1200 ℃, is counted the hollow jet with the vortex of 0-2 and sprayed in the drum-shaped reactor, can be reliably and repeatedly realize the afterfire of 30-80%, the efficient that the energy of generation shifts to the molten bath is 80-90%.
Can explaining in theory of the present invention first and second aspects in conjunction with producing above-mentioned surprising effect.It the reasons are as follows described: inject the carbon containing inflammable substance under weld pool surface, along with spray and mixing zone [this paper is referred to as " zone of transition " (transition zone)] be formed on the weld pool surface turbulization, can imagine, except reactant gases, particularly CO and H
2Outside, melt in the molten bath such as metal droplet and splash thing and also can enter zone of transition.Melt does not stay in zone of transition, but the molten bath is returned in circulation, like this, is transferred to that the energy on the melt directly is brought in the molten bath in the zone of transition.Under these conditions, except can be from the feature (feature that vortex-free free jet also has) of surrounding space sucting reaction gas, hollow effusive center also can sucting reaction gas.Oxidizing gas by means of hollow is sprayed can very rapidly burn reactant gases, and when hollow impinging jet zone of transition, the energy that burning generates is transferred to melt at a high speed, is transferred to the molten bath then.Compare with known top blast technology of freely spraying, the latter only sucks the reactant gases of surrounding space, and the application value that hollow is sprayed is that it can be formed centrally second combustion zone in the hollow effusive, and the hollow jet of band vortex can increase its useful effect, because along with the increase of vortex number, the pressure of hollow jet-core region reduces.
A preferred equipment is to spray the solid reactant of pulverizing with the hollow space that one or more hollows are sprayed.This realization this purpose, for example on the solid core in one or more air ports or endosome, adorn a solid reactant transfer lime, this transfer lime can comprise the pipeline that constitutes with abrasion-resistant material.Solid reactant and a kind of carrier gas suspendible are blown into the molten bath by above-mentioned pipeline.For example, in melting and reducing, above-mentioned technology has been successfully used to iron ore, in the molten bath of iron ore, particularly prereduction and iron ore injecting reactor preheating that pre-speed is former.
Controlled and repetition afterfire can be installed two or more air ports on reactor for the reactant gases that the molten bath is generated.The air port of same structure or the air port of different structure can be used in combination, form oxidizing gas ray with vortex.The number in air port is determined by various factors in the reactor, as the size of reactor or the maximum air velocity in each air port.For example, in the drum-shaped reactor of 15 measurement tons, only use an air port just passable, and in the steel-making converter of 100 measurement tons, the most handy two air ports on the top of converter.
Find, in drum-shaped reactor, carry out melting and reducing, its condition be with coal with about 30kg/ branch, iron ore injects about 10 tons iron smelter with the speed that about 30-60kg/ divides, and with 1200 ℃ warm air with about 8000Nm
3/ hour speed blow to weld pool surface with the air port, by changing the afterfire that the vortex number can reach 38-68%.Under these conditions, the vortex number is 0 o'clock, can obtain 38% afterfire.Increase the vortex number and just can improve the degree of afterfire.Therefore, the vortex number be the degree of afterfire in 0.3 o'clock near 48%, the vortex number increases at 0.6 o'clock, the afterfire degree is 58%, the vortex number is 0.9 o'clock, the afterfire degree is about 68%.One ring-type slot is arranged on the air port, and the width in hole is 35mm, and external diameter is 300mm, by mechanically controlling the flow velocity in air port, can change the vortex number.
With regard to oxidizing gas, the geometricdrawing that changes the air port can change the degree of afterfire step by step, and the accurate control between the accurate adjustment of incendiary then and each step can realize by changing the vortex number.Therefore, the common air port with circular open when the vortex number is 0.1, can reach about 30% afterfire, and the vortex number increased to about 1 o'clock, and the afterfire degree increases to about 55%.When spraying in the absence of vortices (the vortex number is 0) airflow with ring-type slot air port, the afterfire degree is at least 40%, and along with the increase (reaching about 1.0) of vortex number, the afterfire degree can increase to about 75%.As ring-type slot air port,, make the afterfire extent control at 30-100% by changing the vortex number as in other factors, having the air port of low slot width with optimum design.
According to first and second aspects of the present invention, when being applied to melting and reducing, reactant can spray into from adding under the weld pool surface or from the top.Supply with ore with the buried air port, or with the air port, top the ground ore is sprayed into iron bath, these two kinds of methods have proved it all is successful.For example; when under weld pool surface, supplying with ore with the air port; the available OBM air port of forming by two coaxial valves; in this case; the fine-grannular ore is carried secretly by a kind of carrier gas; pipe core by the air port injects the molten bath, and the gaseous state in protection air port and/or the liquefied hydrocarbon compound ring-type slot by the air port sprays into the molten bath.Equally, replace ore with carbonaceous inflammable substance, coke or coal as different mass can spray into the molten bath with method.Also available buried air port jet paraffin oxidation gas is as the mixture of oxygen, air or rare gas element and oxygen.
By air port or the spray gun that is arranged in top, molten bath reactant is partly or entirely sprayed into reactor.In such cases, the surging force of carrier gas and ground solid matter bump weld pool surface is generally quite strong, is enough to make solid matter to penetrate the surface and enters in the molten bath.
The method that adds massive ore by the device that is installed on top, molten bath also belongs in the scope of the present invention first and second aspects.
Can be with supplying with all gaseous states, liquid state and the solid matter preheating in molten bath, to improve whole thermal equilibrium.The temperature of preheating is optional, but limited by delivery system.
One or more air ports can be made up of the ring-type air port with shell and inner member, and the diameter of inner member is 2 times of slot width at least, preferably 5 times.Inner member can be made piston-type, moves axially.
Inner member is the moving element of a band piston rod, but its also inactive and fixed.
Method and apparatus of the present invention is used for the steelmaking process tool to have an enormous advantage.In steelmaking process, for example in order to increase the ratio of waste material, carbon and other optional carbon containing thing are added in the iron, react with oxygen, the gas that reaction generates mainly is carbon monoxide and hydrogen, and they can carry out afterfire on iron bath top and oxidizing gas, and the energy of generation can change the molten bath over to.The description of this process is referring to No. 530510, No. 2755165, German patent specification and No. 2838983 and Australian patent specification, and the disclosed content this paper of these patent specifications draws and makes the contrast document.
In addition, method and apparatus of the present invention being used for iron bath coal gasification process tool has an enormous advantage.In this course, carbonaceous material, particularly coal, in iron bath and reacted, formation reaction gas mainly is hydrogen and carbon monoxide.These reactant gasess partly carry out afterfire on iron bath top and oxic gas physical efficiency, and the energy of generation can change the molten bath over to.The description of this process is referring to German patent specification No. 2520883 and No. 3031680, and No. 539665, Australian patent specification, and the disclosed content this paper of these patent specifications draws and makes the contrast document.
Method and apparatus of the present invention also can be used for the smelting and rducing iron ores process, and tool has an enormous advantage.This process is: with carbon containing thing (particularly coal) reducing iron ore in iron bath, the reactant gases of generation mainly is carbon monoxide and hydrogen, and they carry out afterfire on iron bath top and oxidizing gas, and the energy of generation changes the molten bath over to.The description of this process is referring to No. 563051, No. 3318005, German patent specification and No. 3607775 and Australian patent specification, and the disclosed content this paper of these patent specifications draws and makes the contrast document.
By unrestriced embodiment and sketch, the preferred embodiment of the inventive method and equipment is described below:
Fig. 1 is the longitudinal diagram of the drum-shaped reactor of melting and reducing;
Fig. 2 is the front view in blowing air port, top, and it is one of member of reactor shown in Figure 1;
Fig. 3 is the end view of the outlet of air port shown in Fig. 1 and 2;
Fig. 4 and Fig. 5 are the end views of other air port outlet.
Equipment shown in Figure 1 comprises the drum-shaped reactor with box hat 1 and refractory liner 2, and this reactor also comprises iron and ferric oxide molten bath 4.
This equipment also comprises the injection air port 5 of stretching into reactor bottom, and this air port is sent into reactant under the surface 3 in iron and ferric oxide molten bath 4.Spray air port 5 and form, promptly interior pipe 6 and outer tube 7 by two coaxial valves.Sweet natural gas as protective medium sprays the pipe 6 in air port 5 and 7 ring-type slot injection by each.Ore and carrier gas are blown into by the interior pipe 6 in arbitrary air port in the air port 5, and solid burning article (mainly being the ground coal) and carrier gas are injected by the interior pipe 6 that sprays another air port in the air port 5.
This equipment also comprises air port, top 8, and it sprays the oxidizing gas vortex on the surface 3 in iron and ferric oxide molten bath 4.Waste gas after the afterfire (major part is burnt) is discharged reactor from exporting 9.
Fig. 2 clearly illustrates that: air port 8 comprises the gas inlet 12 of water cooling overcoat 11 and adjustable tangential installation, and circular pneumatic outlet 13.Overcoat 11 includes a piston-like inner member 14, and it is by moving element 15 and be attached thereto the axle 16 that connects and form.Inner member 14 can move axially, and sees Fig. 3 thereby can change ring-type slot 17() width.The width of ring-type slot is limited by overcoat 11 and the moving element 15 near outlet 13.
Cross inlet 12 in air communication and tangentially enter under the influence of overcoat 11 and under the help of moving element 15, air-flow leaves outlet and had vortex at 17 o'clock.The gas inlet of adjustable tangential installation can be used for changing vortex.
Fig. 4 represents the end view of the outlet cross section of another kind of tuyere structure, and wherein the optimum width of ring-type slot 20 is 15mm, and the distance 21 of two nearest opposite side is 160mm.Less inner member diameter 21 is 2 times of slot 20 width at least, preferably 5 times.
Fig. 5 represents the end view in parallel connection type air port.During use, the direction of vortex is preferably opposite in two ring-type slots 22 and 23, shown in two arrows among the figure.This air port has two solid core 24 and 25, can form two strands of hollow jets, and consequently axial 26 expanded range is greater than axial 27.
Drum-shaped reactor shown in Figure 1 is used for the melting and reducing test.Coal is blown in the molten bath 4 of about 10 measurement tons with the speed that 30Kg/ divides by bottom tuyeres, and by bottom tuyeres, the speed of dividing with 32Kg/ adds ore, and the speed of dividing with 2Kg/ adds white lime so that scoriaceous formation.In order to transport the ground solids, as carrier gas, flow velocity is about 10Nm with nitrogen
3/ minute.Simultaneously, spray the air port in order to protect, it is 2Nm that the ring-type slot by each air port injects the Sweet natural gas flow velocity
3/ minute.Be ejected on the surface 3 in molten bath 4 with the air blast warm air of an air port with 1200 ℃, this air port has the circular section outlet, and diameter is 200mm, and spraying rate is 135Nm
3/ minute.Absolute pressure in the hot-blast pipe is about 1.7 * 10
5Handkerchief (1.7 crust), the absolute pressure in the reactor is about 1.25 * 10
5Handkerchief (1.25 crust).
With the known free jet that does not have vortex, under top condition, the afterfire degree that reaches is up to 30%.As a comparison, utilize under the vortex influence of top jet, the afterfire degree is increased reliably, and can accurately control by changing the vortex number.For example, the vortex number is about 0.5 o'clock, and the afterfire degree reaches about 45%.This makes the ore input rate increase to about 40Kg/ branch, and iron bath is temperature-resistant.
Use same reactor, by above-mentioned same operational condition, only adorn an air port shown in Figure 2 in reactor head, can greatly increase the degree of afterfire, pneumatic outlet 13 diameters in this air port are 300mm, and the width of ring-type slot 17 is 35mm.The vortex number is 0.8 o'clock, and the afterfire degree reaches 65%.Under these conditions, the speed that coal divides with 25Kg/, ore is added in the reactor with the speed that 53Kg/ divides.
In less reactor, press the condition of melting and reducing test, can reliably and repeatedly reach above-mentioned afterfire degree.
According to most preferred embodiment described herein, without departing from the spirit and scope of the present invention, can carry out many improvement.
Claims (21)
1, a kind of method that is used for the reactant gases afterfire, this method makes the reactant gases that produces in the iron bath in this afterfire above molten bath by means of one oxidizing gas jet at least, and consequent energy changed in this molten bath, the method is characterized in that by one or more air ports and spray one or more strands of oxidizing gas jets with hollow effusive form to this weld pool surface.
2, the described method of claim 1 is characterized in that one or more strands of oxidizing gas effusive cross sections are annular.
3, the described method of claim 2 is characterized in that the solid reactant that will pulverize sprays in the one or more strands of oxidizing gas effusive hollow part.
4, the described method of claim 3 is characterized in that one or more strands of oxidizing gas jets are sprayed by vortex.
5, the described method of claim 4 is characterized in that the oxidizing gas effusive vortex scope of counting is 0.1 to 5.
6, the described method of claim 5 is characterized in that the oxidizing gas effusive vortex scope of counting is 0.1 to 2.
7, the described method of claim 6 is characterized in that described vortex number is adjustable, therefore this afterfire is changed.
8, the described method of claim 7 is characterized in that spraying one or more strands of oxidizing gas jets with the angle with 10 ° to 90 ° of static weld pool surfaces to this molten bath.
9, the described method of claim 8 is characterized in that described oxidizing gas comprises oxygen, air or oxygen and rare gas element, carbonic acid gas, the mixture of water vapor.
10, the described method of claim 9 is characterized in that earlier oxidizing gas being preheated before weld pool surface sprays.
11, the described method of claim 10 is characterized in that oxidizing gas forms by being preheating to 1000 ° of air to 1600 ℃ of scopes.
12, a kind of described method of claim 1 that realizes is used for the equipment of reactant gases afterfire, this equipment makes the reactant gases that produces in the iron bath in this afterfire above molten bath by means of one oxidizing gas jet at least, and consequent energy changed in the molten bath, this equipment is characterised in that described equipment comprises that at least one is used for spraying towards weld pool surface the oxidizing gas effusive air port of one hollow.
13, the described equipment of claim 12 is characterized in that described one or more air port is the oxidizing gas hollow effusive device that is suitable for spraying one annular cross section.
14, the described equipment of claim 13 is characterized in that described one or more air port is equipped with the transfer lime of the solid reactant of pulverizing being spurted into oxidizing gas hollow effusive hollow space.
15, the described equipment of claim 14 is characterized in that one or more air ports are equipped with the device that the hollow jet that is suitable for making oxidizing gas produces vortex.
16, the described equipment of claim 15 is characterized in that it is adjustable that the device of vortex is provided, and therefore, can change the oxidizing gas effusive vortex number of each burst hollow.
17, the described equipment of claim 16 is characterized in that described one or more air port is made of annular tuyere, and this air port has the inner member that shell and a diameter are at least slot mouth width twice.
18, the described equipment of claim 17 is characterized in that with the angle on 10 ° to 90 ° on static plane, molten bath described one or more air port to be installed, so that to molten bath jet paraffin oxidation gas-jet.
19, claim 1 and 12 application of described method and apparatus in steelmaking process.
20, claim 1 and 12 described method and apparatus reduce in the iron ore melting, that is, and and the application of reducing iron ore in the iron bath.
21, claim 1 and 12 described method and apparatus promptly, make the application of gasification in gasification in iron bath.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPI6745 | 1988-02-12 | ||
| AUPI674188 | 1988-02-12 | ||
| AUPI6741 | 1988-02-12 | ||
| AUPI9558 | 1988-07-29 | ||
| AUPI955888 | 1988-07-29 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89100828 Division CN1016703B (en) | 1988-02-12 | 1989-02-11 | Process and apparatus for post combustion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1058807A true CN1058807A (en) | 1992-02-19 |
| CN1022191C CN1022191C (en) | 1993-09-22 |
Family
ID=25643426
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89100828 Expired CN1016703B (en) | 1988-02-12 | 1989-02-11 | Process and apparatus for post combustion |
| CN 91108513 Expired - Lifetime CN1022191C (en) | 1988-02-12 | 1989-02-11 | Process of and apparatus for post combustion |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89100828 Expired CN1016703B (en) | 1988-02-12 | 1989-02-11 | Process and apparatus for post combustion |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN1016703B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045009C (en) * | 1996-10-04 | 1999-09-08 | 孙秉权 | Method and equipment for jet reduction for making pig iron |
-
1989
- 1989-02-11 CN CN 89100828 patent/CN1016703B/en not_active Expired
- 1989-02-11 CN CN 91108513 patent/CN1022191C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1022191C (en) | 1993-09-22 |
| CN1037542A (en) | 1989-11-29 |
| CN1016703B (en) | 1992-05-20 |
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| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
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