CN108265153B - Double-closed-loop dynamic optimization LT method converter gas recovery and fan energy-saving control method - Google Patents
Double-closed-loop dynamic optimization LT method converter gas recovery and fan energy-saving control method Download PDFInfo
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- CN108265153B CN108265153B CN201611254529.1A CN201611254529A CN108265153B CN 108265153 B CN108265153 B CN 108265153B CN 201611254529 A CN201611254529 A CN 201611254529A CN 108265153 B CN108265153 B CN 108265153B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C2100/00—Exhaust gas
- C21C2100/02—Treatment of the exhaust gas
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C2100/00—Exhaust gas
- C21C2100/06—Energy from waste gas used in other processes
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a double closed-loop dynamic optimization LT method converter gas recovery and fan energy-saving control method, belongs to converter steelmaking LT method gas recovery technology and fan speed-changing energy-saving technology, aims to research and develop a control method adaptive to converter gas recovery and fan speed-changing energy-saving working conditions according to the characteristics of LT method converter gas recovery and fan speed-changing operation so as to improve the converter gas recovery rate and realize fan speed-changing energy-saving optimization control, and is characterized in that the opening degree of a fan inlet valve is adjusted according to the converter gas flow, the speed of a fan is controlled according to furnace mouth micro-differential pressure, good gas recovery effect and fan energy-saving effect are obtained by organically combining the two, and the method can be widely applied to various newly-built, expanded or modified LT method converter dedusting gas recovery systems.
Description
Technical Field
The invention belongs to a converter steelmaking LT method gas recovery technology and a fan speed-changing energy-saving technology.
Background
Converter gas is an important secondary energy source for iron and steel enterprises, the recovery of the converter gas accounts for about 80-90% of the total energy recovery amount of the whole converter process, and the converter gas is a key link for negative energy steelmaking and reduction of process energy consumption. The converter gas has higher calorific value, is a high-quality fuel, can play an important role in the fuel balance of iron and steel enterprises, is one of weak links of secondary energy recycling in China, improves the recovery amount of the converter gas, not only can effectively reduce the production cost of a steelmaking process, lays a foundation for realizing negative energy steelmaking, but also can greatly reduce the total pollutant emission amount of a steel mill and realize clean production.
At present, the recovery levels of converter gas in domestic converters are different, the recovery level of converter gas in high-level steel mills is close to the international high-level standard, but the recovery of converter gas in most steel mills is still at a lower level, and the converter gas recovery in most steel mills has management reasons, but the converter gas recovery mainly belongs to the technical aspect.
According to the heat value of converter gas, 7500kJ/m3For the reference, the current better level of domestic coal gas recovery is 90-110 m3Between t, the current converter steel yield is about 7-8 hundred million tons per year, and if the coal gas recovery level is improved by 10%, about 63-10 coal gas can be recovered per year8～88*108m3The equivalent standard coal is about 161.4-225.5 ten thousand tons; if the average level of domestic coal gas recovery is 60-80 m3Calculated between t, if the coal gas recovery level is increased by 20 percent, about 84 to 10 more coal gas can be recovered every year8 ～128*108m3The standard coal is equivalent to 215.2-328 ten thousand tons; the energy-saving benefit is considerable, and simultaneously, the total amount of the pollutant emission of the steel mill is remarkably reduced.
At present, converter flue gas dust removal and gas recovery systems are mainly divided into three types: wet (OG method oxygen converter Gas Recovery System) dust removal, semidry dust removal and LT (Lurgi-Thyssen) dry dust removal. The semidry dust removal method is developed from wet dust removal (OG method), and belongs to OG dust removal. The scope of this patent discussion is limited to LT dry dedusting only.
Regarding the LT dry dedusting control technology, control strategies such as multi-stage fan speed change control, micro-differential pressure regulation fan speed change, micro-differential pressure regulation fan inlet valve opening degree and the like are adopted at present.
The existing control technologies are basically divided into two types, firstly, the rotating speed of a fan is controlled according to a process running state or a furnace mouth micro-differential pressure, so that the air draft of the fan is kept consistent with the generation amount of flue gas, the flue gas is prevented from overflowing or excessive air is prevented from being sucked into a converter cover, and the optimal control state is expected to be achieved through the rotating speed control of the fan; secondly, the opening of the inlet valve of the fan is adjusted through the micro differential pressure of the furnace mouth, so that the air draft quantity of the fan is consistent with the generation quantity of the smoke, the smoke is prevented from overflowing or excessive air is prevented from being sucked into the converter cover, and the optimal control state of the opening is hopefully achieved through the accurate positioning of the inlet valve of the fan.
The existing control technology has the problems that the whole process of controlling coal gas recovery by depending on the rotating speed of a fan or depending on the opening degree of an inlet valve of the fan inevitably has certain defects, for the former, the speed change range of the fan is limited due to the limitation of wind pressure and wind speed, particularly, in the later smelting period, along with the reduction of the smoke gas amount, the speed change regulation of the fan is ineffective, the coal gas recovery amount is lost, and a lot of energy-saving space of the fan is wasted; for the latter, because the inherent characteristic that the fan inlet valve is not suitable for adjusting the micro-differential pressure in a large range, the micro-differential pressure system has unstable operation factors, and particularly under the condition of large disturbance, the adjustment process of the fan inlet valve by the existing control technology is not only not solved, but also the operation condition is worsened, so that the existing system is usually difficult to realize full-automatic control.
In conclusion, the existing control technology can not fundamentally meet the requirements of converter gas recovery and fan speed change energy-saving application, and theoretical research and application technology are urgently needed to be broken through.
Published publications, documents or data are not yet seen about a double closed-loop dynamic optimization LT method converter gas recovery and fan energy-saving control method.
Disclosure of Invention
The invention aims to research and develop a control method adaptive to the working conditions of converter gas recovery and fan speed change energy conservation according to the characteristics of LT method converter gas recovery and fan speed change energy conservation operation so as to improve the converter gas recovery rate and realize fan speed change energy conservation optimal control.
The invention has the key points that the problems existing in the prior control technology are researched, the foundation and the framework of the prior control technology are broken through, a double closed-loop dynamic optimization LT method converter gas recovery and fan energy-saving control method is innovatively adopted, the opening of a fan inlet valve is adjusted according to the flue gas volume of the converter, and a fan inlet valve opening control closed-loop dynamic system is formed; controlling the speed of a fan according to the micro differential pressure of the furnace mouth to form a closed-loop dynamic system for controlling the micro differential pressure of the furnace mouth; the good coal gas recovery effect and the fan energy-saving effect are obtained by organically combining the two closed-loop dynamic systems.
Drawings
The attached figure is a control block diagram of a double closed-loop dynamic optimization LT method converter gas recovery and fan energy-saving control method, wherein, figure 1 is a gas recovery and fan system data information processing and control device which is a digital device based on a computer workstation; 2, a converter process main control system which is an existing control system; 3 is a dynamic controller for gas recovery and fan speed regulation, which is composed of a PLC (programmable logic controller) or other digital controllers; 4, the fan inlet valve driving device is a hydraulic, pneumatic or electric driving device; 5 is a fan inlet valve which is a regulating valve; 6, a fan inlet valve opening sensor, wherein the valve opening is fed back to a coal gas recovery and fan speed regulation dynamic controller; 7 is a fan frequency conversion speed regulating device which receives speed instructions from a coal gas recovery and fan speed regulation dynamic controller and carries out frequency conversion speed regulation control on a fan motor; 8 is a fan motor; 9 is a fan; 10, a pressure detector, which is a group of pressure detection devices consisting of more than 3 pressure detectors, is arranged at a certain position on the smoke hood and is used for accurately and reliably measuring the pressure in the furnace; 11, the process parameters and the equipment state information are used as feedback information and are sent to a coal gas recovery and fan speed regulation dynamic controller; and 12, a gas recovery and fan process system, which comprises all equipment and facilities on site.
Detailed Description
In the LT method gas recovery control mode in the prior art, the main flow is a control mode of regulating the rotating speed of a fan according to a process running state or a furnace mouth micro-differential pressure, the control object is the rotating speed of the fan, the purpose is to obtain corresponding flow change, when the rotating speed of the fan is reduced, the wind pressure and the wind speed of a pipe network system are correspondingly reduced, a gas recovery system and an electric dust removal system have certain requirements on the wind pressure and the wind speed, and the requirement limits the variable speed range of the fan. The limitation of the speed change range of the fan means that the gas recovery rate and the energy conservation of the fan are adversely affected, and particularly, in the later stage of converter smelting, along with the gradual reduction of the smoke generation amount, the prior art obviously loses due control action, so that the CO content is reduced, the oxygen content is increased, the gas recovery process in the later stage of smelting is very short, and the main reason is that the gas recovery rate is severely restricted.
Another LT method gas recovery control method in the prior art is to control the flow rate by adjusting the opening of the inlet valve of the blower through the micro-differential pressure, but because the inlet valve of the blower has inherent non-linear characteristics and is insensitive to flow rate adjustment, the result is that the flow rate adjustment effect is limited through the micro-differential pressure, and particularly when large interference occurs, the micro-differential pressure system tends to be in an unstable working state, so the existing micro-differential pressure system is often limited by the upper and lower limits of the opening of the valve and is provided with manual intervention measures. From the effect of gas recovery, the gas recovery index is difficult to improve due to unstable system operation and deviation of the flow control result from the target value. Particularly, in the later stage of converter smelting, along with the gradual reduction of the flue gas amount, the micro-differential pressure control obviously loses due control action, so that the CO content is reduced, the oxygen content is increased, the coal gas recovery process in the later stage of smelting is very short, and the coal gas recovery rate is severely restricted.
Through deep analysis and research, the improvement and the reconstruction based on the prior art are not good technical approaches, because the prior art has inherent defects, an innovative way needs to be created, and the most effective means for solving the problems is to adopt a double closed-loop dynamic optimization LT method for gas recovery and a fan energy-saving control method. The method consists of two closed-loop dynamic systems, wherein the closed-loop dynamic system is used for controlling the opening of a fan inlet valve according to the flue gas volume of the converter, and the closed-loop dynamic system is used for adjusting the rotating speed of the fan according to the micro-differential pressure of a furnace mouth; the opening of the inlet valve of the fan is controlled according to the flue gas volume of the converter, so that the flow and the flow velocity of the flue gas flowing through the inlet valve can be controlled and utilized best, the dust removal efficiency is improved, and the energy conservation of the fan is facilitated; the rotation speed of the fan is controlled according to the micro-differential pressure at the furnace mouth, so that the pressure in the furnace can be controlled within a required range, the overflow of smoke in the furnace is reduced or eliminated, the suction of air at the furnace mouth is reduced or eliminated, the heat value of the recovered coal gas is favorably improved, the oxygen content in the pre-combustion period and the post-combustion period of smelting is favorably reduced, and the coal gas recovery time is favorably prolonged.
Essentially, the opening degree of the inlet valve of the fan corresponds to the smoke generation amount in the converter, namely the opening degree of the inlet valve of the fan depends on the actual smoke amount, the change of the opening degree of the inlet valve of the fan changes the characteristic curve of the pipe network, and the load of the fan changes accordingly. When the flue gas volume of the converter is large, the inlet valve is opened greatly, and the load of the fan is increased; when the smoke gas amount of the converter is small, the inlet valve is closed down, and the load of the fan is reduced. Obviously, the method for controlling the opening degree of the fan inlet valve according to the flue gas volume is the most direct method for controlling the flow rate, while the method for controlling the opening degree of the fan inlet valve by adopting the micro differential pressure at the furnace mouth is an indirect method for controlling the flow rate, and due to the nonlinear change relationship between the flow rate and the pressure and the nonlinear characteristics of the inlet valve, the final control result for controlling the flow rate through the micro differential pressure deviates from a target value, even the unstable operation of the system is caused.
Under the condition of correspondingly controlling the opening of the inlet valve of the fan according to the amount of flue gas, the speed of the fan is controlled by adopting the micro-differential pressure of the furnace opening, so that the simple, effective and stable method for ensuring the pressure in the converter is provided, the flow speed and the pressure of the flue gas in a pipe network are well improved, the speed change range of the fan is greatly improved, and the requirements of gas recovery and fan energy-saving optimization in the pre-combustion period and the post-combustion period of smelting can be met.
The method for controlling the gas recovery and the fan energy conservation of the double closed loop dynamic optimization LT method converter is realized by a system shown in the attached drawing, wherein a gas recovery and fan system data information processing and controlling device [1] is the core of the energy-saving control of the gas recovery and the fan of the double closed loop dynamic optimization LT method converter, a digital device which is formed on the basis of a computer workstation is built with an LT method converter gas volume database, and obtains interlocking information of production operation, equipment state information and related system parameters from a converter process main control system [2] in real time, obtains related information of the gas recovery system and the fan operation from a dynamic controller [3] of gas recovery and fan speed regulation in real time, determining control parameters of gas recovery and fan speed regulation according to the information, related system parameters and related data of the flue gas amount, and outputting the control parameters to a gas recovery and fan speed regulation dynamic controller [3 ]; particularly, the opening degree value of the inlet valve of the fan can be conveniently and accurately calculated through a converter flue gas volume database, and then the opening degree value is output to a coal gas recovery and fan speed regulation dynamic controller [3], so that the opening degree of the inlet valve of the fan is dynamically controlled; the gas recovery and fan speed regulation dynamic controller [3] consists of a PLC (programmable logic controller) or other digital controllers, and outputs a set value to a fan inlet valve driving device [4] according to the control parameters of the gas recovery and fan system data information processing and controlling device [1 ]; a coal gas recovery and fan speed regulation dynamic controller [3], a fan inlet valve driving device [4], a fan inlet valve [5], a fan inlet valve opening degree sensor [6] and a coal gas recovery and fan process system [12] form closed-loop dynamic regulation of the fan inlet valve opening degree; a coal gas recovery and fan speed regulation dynamic controller [3] receives a micro-differential pressure set value from a coal gas recovery and fan system data information processing and controlling device [1], outputs the set value to a fan frequency conversion speed regulating device [7] and regulates the rotating speed of a fan; the pressure detector [10] is a group of pressure detection devices consisting of more than 3 pressure detectors, is arranged at a certain position on the smoke hood, and the detection information is sent to the dynamic controller [3] for gas recovery and fan speed regulation for accurately and reliably measuring the pressure in the furnace; a coal gas recovery and fan speed regulation dynamic controller [3], a fan frequency conversion speed regulation device [7], a fan motor [8], a fan [9], a pressure detector [10] and a coal gas recovery and fan process system [12] form closed-loop dynamic regulation of furnace mouth micro-differential pressure; the process parameter and equipment state information [11] is connected with a gas recovery and fan speed regulation dynamic controller [3] and a gas recovery and fan process system [12 ]; by adopting the system, the closed-loop dynamic continuous control of the opening of the fan inlet valve and the closed-loop dynamic continuous control of the furnace mouth micro-differential pressure are realized.
Regarding the flue gas amount of the converter, during the smelting of the converter, the flue gas amount is dynamically changed, main factors influencing the flue gas amount include oxygen blowing amount and strength, molten iron loading amount and components, scrap steel loading amount and components, auxiliary raw material loading amount and components, alloy loading amount and components, smelting time and the like, off-line calculation and on-line correction calculation can be carried out on the flue gas generation amount according to relevant factors, a large amount of calculation data form the basis of a computer workstation database, the flue gas amount greatly disturbed during the feeding is also obtained through a database formed by the off-line calculation and the on-line correction calculation data, and after actual operation, when the data of the database and the actual operation condition are output, the database is corrected and updated according to the actual value. A remarkable characteristic of the change of the flue gas volume in the smelting process of the converter is that the flue gas volume is gradually reduced along with the lapse of smelting time, particularly the flue gas volume is reduced in the later stage of smelting, and the existing control technology is insensitive to the change of the flue gas volume, so that the content of CO is rapidly reduced in the later stage of smelting, and the recovery amount of coal gas is reduced. The method is completely different from the method in that the double closed loop dynamic optimization LT method converter gas recovery and fan energy-saving control method can dynamically adjust the inlet valve of the fan according to the flue gas volume of the converter in the later stage of smelting, the opening degree of the inlet valve is gradually reduced along with the reduction of the flue gas volume, and the rotating speed of the fan is correspondingly reduced, so that even in the later stage of smelting, the control strategy is adopted to ensure that the flow rate flowing through the inlet valve is not greatly changed, the CO content is ensured not to be greatly changed, and the oxygen content is ensured not to be greatly changed, so that the time for gas recovery and the gas heat value can be prolonged, and the energy saving of the fan.
The method for the double-closed-loop dynamic optimization LT method converter gas recovery and fan energy-saving control has the characteristics of scientifically, reasonably, fully and effectively playing the functions and effects of the fan inlet valve opening and the fan speed regulation, optimizing the single control in the prior art into two closed-loop dynamic systems of fan inlet valve opening control according to the smoke gas amount and fan speed regulation according to the furnace mouth micro-differential pressure, having simple system composition, effective, reliable and stable operation and extremely convenient debugging, and realizing the full-automatic control of the gas recovery and the fan energy saving without manual intervention.
The method for dynamically optimizing LT method converter gas recovery and fan energy-saving control through double closed loops creates a brand-new and wide visual field and space for LT method converter gas recovery and fan variable speed energy-saving application, and after the method for dynamically optimizing LT method converter gas recovery and fan energy-saving control through double closed loops is adopted, the gas recovery rate can be improved, the fan can further save energy, the estimated gas recovery rate can be improved by 10% -50% on the basis of different systems at present, and the fan energy-saving index can be improved by 12% -40% on the basis of the prior art.
The double-closed-loop dynamic optimization LT method converter gas recovery and fan energy-saving control method can be widely applied to various LT method converter dust removal gas recovery systems newly built, expanded or modified.
Claims (3)
1. A double closed-loop dynamic optimization LT method converter gas recovery and fan energy-saving control method is characterized in that the opening degree of a fan inlet valve is adjusted according to the flue gas volume of a converter to form a fan inlet valve opening degree control closed-loop dynamic system; controlling the speed of a fan according to the micro differential pressure of the furnace mouth to form a closed-loop dynamic system for controlling the micro differential pressure of the furnace mouth; under the condition of correspondingly controlling the opening of a fan inlet valve according to the smoke volume of the converter, the speed of the fan is controlled by adopting the micro differential pressure of a furnace mouth, and a good gas recovery effect and a good fan energy-saving effect are obtained by organically combining two closed-loop dynamic systems; regarding the flue gas quantity of the converter, during the smelting of the converter, the flue gas quantity is dynamically changed, main factors influencing the flue gas quantity include oxygen blowing quantity and strength, molten iron loading quantity and components, scrap steel loading quantity and components, auxiliary raw material loading quantity and components, alloy loading quantity and components and smelting time, off-line calculation and on-line correction calculation can be carried out on the flue gas generation quantity according to relevant factors, a large amount of calculation data form the basis of a computer workstation database, the flue gas quantity with large disturbance during feeding is also obtained through a database formed by the off-line calculation and on-line correction calculation data, and after actual operation, when the data of the database and the actual operation condition are output, the actual database is corrected and updated according to actual values;
the system is characterized in that a gas recovery and fan system data information processing and control device (1) is the core of double closed-loop dynamic optimization LT method converter gas recovery and fan energy-saving control, is a digital device formed on the basis of a computer workstation, is provided with an LT method converter flue gas volume database, acquires interlocking information of production operation, equipment state information and related system parameters from a converter process main control system (2) in real time, acquires related information of gas recovery system and fan operation from a gas recovery and fan speed regulation dynamic controller (3) in real time, determines control parameters of gas recovery and fan speed regulation according to the information, the related system parameters and the related data of flue gas volume, and outputs the control parameters to the gas recovery and fan speed regulation dynamic controller (3); the opening value of the inlet valve of the fan can be conveniently and accurately calculated through a converter flue gas volume database, and then the opening value is output to a coal gas recovery and fan speed regulation dynamic controller (3) to dynamically control the opening of the inlet valve of the fan; the gas recovery and fan speed regulation dynamic controller (3) consists of a PLC or other digital controllers and outputs a set value to the fan inlet valve driving device (4) according to the control parameters of the gas recovery and fan system data information processing and controlling device (1); a coal gas recovery and fan speed regulation dynamic controller (3), a fan inlet valve driving device (4), a fan inlet valve (5), a fan inlet valve opening sensor (6) and a coal gas recovery and fan process system (12) form closed-loop dynamic regulation of the fan inlet valve opening; the coal gas recovery and fan speed regulation dynamic controller (3) receives a furnace mouth micro-differential pressure set value from the coal gas recovery and fan system data information processing and controlling device (1), outputs the set value to the fan frequency conversion speed regulation device (7) and regulates the fan rotating speed; the pressure detector (10) is a group of pressure detection devices consisting of more than 3 pressure detectors, is arranged at a certain position on the smoke hood, and the detection information is sent to the dynamic controller (3) for gas recovery and fan speed regulation for accurately and reliably measuring the pressure in the furnace; a coal gas recovery and fan speed regulation dynamic controller (3), a fan frequency conversion speed regulation device (7), a fan motor (8), a fan (9), a pressure detector (10) and a coal gas recovery and fan process system (12) form closed-loop dynamic regulation of furnace mouth micro-differential pressure; the process parameter and equipment state information (11) is connected with a coal gas recovery and fan speed regulation dynamic controller (3) and a coal gas recovery and fan process system (12); by adopting the system, the closed-loop dynamic continuous control of the opening of the fan inlet valve and the closed-loop dynamic continuous control of the furnace mouth micro-differential pressure are realized.
2. The method according to claim 1, characterized in that the inlet valve of the fan is dynamically adjusted according to the flue gas volume of the converter in the later stage of smelting, the opening of the inlet valve is gradually reduced along with the reduction of the flue gas volume, and the rotating speed of the fan is correspondingly reduced, so that even in the later stage of smelting, the adoption of the control strategy ensures that the flow rate flowing through the inlet valve is not greatly changed, the change of the CO content is not large, and the change of the oxygen content is not large, thereby increasing the time for recovering the coal gas and the heat value of the coal gas, and improving the energy saving of the fan.
3. The method according to claim 1, wherein the method is widely applied to newly-built, expanded or modified various LT method converter dedusting gas recovery systems.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08122477A (en) * | 1994-10-20 | 1996-05-17 | Hitachi Ltd | Control rod drive system |
| JP2000140663A (en) * | 1998-11-09 | 2000-05-23 | Babcock Hitachi Kk | Roller mill |
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| CN102888488B (en) * | 2012-10-17 | 2014-12-17 | 中冶南方工程技术有限公司 | Control method of draught fan for dry dust removal of converter gas |
| CN205576195U (en) * | 2016-04-12 | 2016-09-14 | 唐山钢铁集团有限责任公司 | Adjusting device is pressed to converter mouth elementary errors that dry process was removed dust |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08122477A (en) * | 1994-10-20 | 1996-05-17 | Hitachi Ltd | Control rod drive system |
| JP2000140663A (en) * | 1998-11-09 | 2000-05-23 | Babcock Hitachi Kk | Roller mill |
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