CN2294437Y - Automatic control device for rotary-drum kiln thermodynamic process - Google Patents
Automatic control device for rotary-drum kiln thermodynamic process Download PDFInfo
- Publication number
- CN2294437Y CN2294437Y CN 96248700 CN96248700U CN2294437Y CN 2294437 Y CN2294437 Y CN 2294437Y CN 96248700 CN96248700 CN 96248700 CN 96248700 U CN96248700 U CN 96248700U CN 2294437 Y CN2294437 Y CN 2294437Y
- Authority
- CN
- China
- Prior art keywords
- rotary kiln
- automatic control
- instrument
- temperature sensor
- color temperature
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000008569 process Effects 0.000 title claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 15
- 239000000835 fiber Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000006870 function Effects 0.000 abstract description 2
- 239000013307 optical fiber Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
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- Muffle Furnaces And Rotary Kilns (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The utility model relates to an automatic control device for a rotary kiln thermodynamic process, which is composed of a measuring instrument, an automatic control instrument, an executive instrument and an auxiliary device. The measuring instrument comprises an optical fiber color temperature sensor, a slip circle type thermoscope and an oxygen quantity transmitter, and the three parts are respectively connected with the automatic control instrument through cables. The automatic control instrument is composed of an operator panel and a computer which comprises a process state arbiter and has the functions of a PID controller, a double dimensional weighting fuzzy logic controller, a soft manual controller, etc., and the automatic control instrument outputs signals to the executive instrument and the auxiliary device. The utility model has the advantages of reasonable and accurate acquisition of signal, wide control range and strong anti-interference ability.
Description
The utility model relates to rotary kiln thermal process automaton.
Rotary kiln is the key equipment of alumina by sintering and wet-process cement production process, and the degree of stability of rotary kiln thermal process has significant impact to the production technology economic indicator.Therefore in process of production, operating personnel's main task is to change to regulate at any time according to process conditions related parameter is arranged, and is in stable state to guarantee the thermal process in the rotary kiln as far as possible.
Existing rotary kiln thermal process automaton generally is made of three temperature sensors, two pressure transmitters, single-loop controller and corresponding control strategies, two cover actuators, wherein three temperature sensors are respectively a radiation pyrometer (being used for measuring rotary kiln clinkering zone temperature of charge), two thermocouples (being used for measuring rotary kiln gas flow temperature and exhaust blower inlet mound entraining air stream temperature respectively), its control strategy is regulated for single loop PID, and two cover actuators are used for regulating air quantity and go into the Coal-fired capacity of kiln.This single loop PID regulates and can only be applicable to the very little situation of process conditions fluctuation, when the composition of fire coal or slip or the fluctuation of other process conditions were big slightly, it just was difficult to adapt to, and shows as regulation quality variation, control deterioration, the automatic control state of being obliged to retreat enters manual state.Owing to the self-characteristic of this adjusting, making had both increased the disturbance of thermal process by the actuator frequent movement, had shortened the life-span of actuator again simultaneously.In addition, conventional device exists irrationality and inaccuracy obtaining of thermal parameter.This device reflects burning of gas situation in the kiln indirectly with kiln exhaust gas stream temperature, and it can not reflect the coefficient of excess of furnace air truly.Thereby can occur because of the furnace air coefficient of excess on the low sidely, carbon monoxide content is higher, even " running coal " takes place, and makes the phenomenon that " blast " takes place in the cottrell.The serious accident that indivedual units also occurred so reason is burnt whole cottrell is lost huge.Clinkering zone temperature of charge parameter is to adopt radiation pyrometer to measure for another example.It is bigger that this metering system is measured condition influence, when factors vary such as material composition or coal-fired composition cause in the kiln smog or dust big, measurement result occurred than mistake, causes control device malfunctioning or the control quality is reduced greatly.Because situations such as the large time delay characteristic of rotary kiln also causes control hysteresis, and the adjustment process fluctuation is too big.
The purpose of this utility model provides a kind of rotary kiln thermal process automaton, this device can improve the antijamming capability and the certainty of measurement of thermal parameter measuring process, adapt to the bigger process conditions of fluctuation range, prolong the life-span of rotary kiln liner and actuator, reduce coal-fired consumption, guarantee the safe and efficient running of cottrell, also reduce labor intensity of operating personnel simultaneously greatly.
Rotary kiln thermal process automaton of the present utility model, make up by the thermal parameter measuring instrument, apparatus for automatic control combination and execution instrument combination and auxiliary equipment constitute, characteristics are that described thermal parameter measuring instrument combination comprises fiber ratio color temperature sensor and converter, slip circle type thermal detector and time-delay retainer, oxygen content transducer, the three is connected to the apparatus for automatic control combination respectively by cable, described apparatus for automatic control combination is by CE/operator panel, and include the PID controller, two dimension Weighted Fuzzy Logic controllers, the computer of function such as soft personal control and process status arbiter is formed, from the measuring-signal of measuring instrument combination and the parameter of importing by CE/operator panel, be delivered to condition identifier respectively, after calculating by analysis, output state of a control signal, automatically open PID controller or two dimension Weighted Fuzzy Logic controller or soft personal control according to different heat engineering state, the controller that is unlocked sends control signal and gives execution instrument combination and auxiliary equipment combination through measuring-signal and setting value are carried out computing.
The thermal parameter measuring instrument makes up by a fiber ratio color temperature sensor and converter, a slip circle type thermal detector and the retainer of delaying time, and an oxygen content transducer is formed.Wherein, the fiber ratio color temperature sensor is installed on the about 3 meters support of rotary kiln end front end, this support can move up and down, the circular hole of a diameter of phi 200mm is opened in the upper left side of rotary kiln head-shield end face, the optical foresight of fiber ratio color temperature sensor sees through the material target that clinkering zone is aimed in this hole, it is a kind of energy comparison expression sensor, it measures the temperature that two kinds of infrared energy ratios that face wavelength mutually characterize the measured point simultaneously, thereby as smog, when factors such as dust are disturbed, influence to measurement result reduces greatly, thereby improved the precision of measured value, it allows operating ambient temperature is-20 ℃-150 ℃, and range is 800 ℃-1300 ℃, and precision is 1.0 grades, the fiber ratio color temperature sensor is connected to converter by an optical cable.
The slip circle type thermal detector is the arc sheetmetal that a pair of mutually insulated arranged side by side is installed on cylinder of rotary kiln, this metallic plate and cylindrical shell also insulate, its width is 200 millimeters, the output signal of inserting a thermocouple at the rotary kiln branch place of ungirding is connected on these two arc sheetmetals, arc and rotary kiln rotate synchronously, below arc, withstood on brush on the arc by a pair of by spring, signal is extracted.Because the length of arc has only 1/5 of cylinder of rotary kiln girth, thereby has reduced the wearing and tearing of slip circle and brush greatly, has prolonged the life-span, has reduced maintenance workload.Because the width of slip circle is 200 millimeters, like this when rotary kiln because the needs of self running and when axis direction moves (normally being ± 40 millimeter), the brush phenomenon of " falling rail " can not appear yet.The time-delay retainer is a common memory circuit, and when signal was imported, its output equaled input, and when input disconnected, its output then " maintenance " was the input value before disconnecting.Like this, when brush and slip circle disengage, just remaining and face " disengaging " preceding numerical value, when brush contacts again with slip circle, then is new input value.Owing to divide the material temperature that ungirds sintering state to be had " in advance " prediction effect, so this signal measures the solution of a difficult problem, controls quality and has obvious effect improving thermal process.The slip circle type thermal detector is installed in the rotary kiln branch place that ungirds, and it allows operating ambient temperature is-25 ℃-250 ℃, and range is 300 ℃-1000 ℃, and precision is 1.0 grades, and the slip circle type thermal detector is connected to the time-delay retainer by compensating wire.
Oxygen content transducer is installed on the upright flue of rotary kiln afterbody, after kiln exhaust gas stream enters the air chamber of transmitter through mozzle, measure wherein oxygen content with the principle of concentration cell, thereby measure the completeness of kiln discharge internal combustion coal combustion truly, guarantee the safe handling of cottrell.Wherein, mozzle also can be sent the flue dust that deposits in the air-flow back to flue, in order to avoid stop up air chamber, oxygen content transducer is made up of a zirconia probe and control thereof and measuring circuit.
The apparatus for automatic control combination is by CE/operator panel and three process status arbiters and PID controller, two dimension Weighted Fuzzy Logic controller and soft personal control are formed accordingly.Wherein, CE/operator panel is man-machine interactive interface tool, by its input operation defined terms, and material sintering temperature set-point of clinkering zone etc. for example; The process status arbiter be one by subtraction circuit, the device that comparison circuit and differential circuit are formed, its input signal is the clinkering zone from the combination of thermal parameter measuring instrument, divide the oxygen content in ungird material actual temperature and the waste gas, and the set-point separately by CE/operator panel input, its output signal is respectively corresponding deviate and the rate of change thereof of above each amount, this deviate compares with predefined state value simultaneously, by difference as a result relatively, automatically start corresponding controller, make it to start working, the working range of three kinds of controllers can be according to different kiln types, product, combination arbitrarily between the certain limit of deviate.
Carrying out the combination of instrument and auxiliary equipment is made up of two YEs, slip electric motor controller, the colored industrial TV monitoring device of two covers, a cover language alarm and the record of notes more than view.Wherein two YEs are installed in air blast air door and exhaust blower air door place respectively, utilize connecting rod the angle of actuator output to be become the adjustment of throttle opening, two are angle stroke YE, adjusting range is the 0-90 degree, output torque is respectively 25 kilograms, rice and 40 kilograms, meter.A slip electric motor controller receives the instruction of apparatus for automatic control combination, adjusts the rotating speed of coal supply spiral, is that 100r.p.m is to 1000r.p.m thereby change coal dust amount, its adjustable range of spraying into rotary kiln.The colored industrial TV monitoring device of two covers is installed in the front and the top of cylinder of rotary kiln front end respectively, see through the materials flow situation of high temp glass hole in order to observe the material sintering situation in the rotary kiln and to enter cooler, they are made up of a colored CCD gamma camera, three variable lenses and a colour picture monitor respectively, the above two are contained in the protective cover that has cooling jacket of a sealing, to adapt to adverse circumstances, it allows operating ambient temperature to be :-20 ℃-100 ℃, the latter is contained in the control room.One cover language alarm is made of with eight different sound circuits eight way control switch.When production process is not normal, trigger the control corresponding switch after judging trouble location automatically by apparatus for automatic control combination, connect its circuit, informed trouble location by loudspeaker.Notes records view more than one can each relevant technological parameter of recording occurring continuously dynamic process, use for operating personnel and administrative staff.
The rotary kiln thermal process automaton course of work of the present utility model is as described below, and after this device was opened, which kind of state selections that at first get the hang of promptly determined to enter by operating personnel according to the situation of each production equipment.When production equipment just often, can drop into " automatically " state (auto state comprises PID control, fuzzy logic control and soft manual state), otherwise enter " manually " operation.At this moment, three process statuses (burning zone temperature, divide ungird temperature, waste gas oxygen content) arbiter is exported clinkering zone material actual temperature x respectively
1', divide the material actual temperature x that ungirds
2', actual oxygen content x in the gas of mound
3' with separately set-point x
1, x
2, x
3Departure e
1, e
2, e
3, and their rate of change e
1', e
2', e
3', that is:
x
1'-x
1=e
1x
2'-x
2=e
2x
3'-x
3=e
3Simultaneously, e
1, e
2, e
3Automatically with the fixed value A that has set
1, A
2B
1, B
2C
1, C
2Compare respectively.Wherein: A
1, B
1, C
1The deviation higher limit of be respectively burning zone temperature, dividing the temperature that ungirds, waste gas oxygen content to be fit to carry out PID control, A
2, B
2, C
2Be respectively above-mentioned three higher limits that parameter is fit to carry out fuzzy logic control.For example:
If e
1＜A
1, then automatically switch to PID control;
If A
1＜e
1＜A
2, then automatically switch to fuzzy logic control;
If e
1＞A
2, and continue then to automatically switch to soft manual state, and send language alarm more than 3 minutes, remind operating personnel to intervene.e
2, e
3Situation and e
1Similar.The action command that controller sends is sent to the execution instrument combination respectively, adjusts the state of coal supply mechanism and wind pushing mechanism respectively, thereby stablizes thermal process.PID controller, soft personal control and fuzzy logic controller drop into automatically, cut out at different thermal process respectively, so that can bring into play advantage separately effectively, avoid its deficiency.Their output signal U i and corresponding deviate e
iWith deviation variation rate e
i' relation be respectively: the PID controller:
k
p: proportionality coefficient T
i: the time of integration T
d: derivative time
Soft personal control: U
i=K.e
iK is a conversion coefficient
Fuzzy logic controller: U
i=α .e
i+ (1-α) .e
i' α is a weight coefficient
Wherein: in the fuzzy logic condition identifier, utilize logical OR and " with " circuit is to e
iAnd e
i' syntactics judge, thereby determine its position in transient process, and selected different α value is with adjustment deviate amount e
iWith deviation variation rate e
i' to the power of output signal effect, realized two dimension Weighted Fuzzy Logic controls, accelerated adjustment process, strengthened antijamming capability.
Rotary kiln thermal process automaton of the present utility model is because measuring instrument adopts the fiber ratio color temperature sensor, the slip circle type thermal detector, oxygen content transducer makes that the signal that obtains is more reasonable, accurately, and two dimension Weighted Fuzzy Logic controllers have been adopted, make control procedure more approach manually-operated thought process, by organic assembling to three kinds of process controllers, carry out the frequent movement of instrument combination when having avoided simple PID to control, prolonged the life-span of actuator, make the accommodation of control device widen greatly again, the big rise and big fall of the temperature in the rotary kiln have been avoided, thereby prolonged the service life of kiln lining, recondition expense and coal-fired consumption have been reduced, increase output, further reduced production cost; Configuration simultaneously is simpler, easy for operation, and antijamming capability is strong, the control accuracy height (set-point ± 3%), also greatly reduce labor intensity of operating personnel.
Fig. 1 is the configuration schematic diagram of the utility model automaton;
Fig. 2 is thermal parameter measuring instrument combination block figure;
Fig. 3 is the block diagram of apparatus for automatic control combination;
Fig. 4 is two dimension Weighted Fuzzy Logic controller block diagrams;
Fig. 5 is a slip circle type thermal detector schematic diagram;
Fig. 6 is a fiber ratio color temperature sensor scheme of installation.
Among Fig. 5 and Fig. 6,1 cylinder of rotary kiln, 2 rotary kiln liners, 3 fens temperature thermocouples that ungird, 4 compensating wires, 5 slip circles, 6 insulation supporters, 7 brushes, 8 brush carriers, 9 compensating wires, 10 springs, 11 materials, 12 fiber ratio color temperature transducers, 13 aiming eyepieces, 14 card tubes, 15 lifting supports, 16 optical cables, the circular hole of opening on the 17 rotary kiln head-shields, 18 rotary kiln head-shields.
The equipment configuration and the using method of the utility model rotary kiln thermal process automaton are as described below, at first open the circular hole of a diameter of phi 200mm in the upper left side of rotary kiln head-shield end face, the height and the angle of fiber ratio color temperature sensor, adjustment support installed at about 3 meters from the front, hole, by its optical sight, make measurement point aim at the material of clinkering zone, be fixed then.Obviously, in the course of the work, can not move this sensor again.Slip circle, thermocouple and brush are installed at the rotary kiln branch place of ungirding then.Oxygen content transducer is installed at rotary kiln flue place again, the angle of its mozzle just in time can be made under the dust spontaneous current that deposits in the flue gas.Miscellaneous equipment is conventional the installation.Afterwards, the circuit that measuring instrument combination, execution instrument combination and auxiliary equipment are made up is connected on respective terminal of apparatus for automatic control combination, send.At last, on CE/operator panel, send into given clinkering zone temperature of charge value x
1, divide the temperature of charge value x that ungirds
2, the oxygen content x in the waste gas
3, this control device can begin operate as normal.When process conditions change when need changing thermal technology's condition of rotary kiln, only need to change above-mentioned three set-point parameters, this control device can be controlled rotary kiln steady production under new thermal technology's condition.Can in away from abominable on-the-spot control room, clearly observe actual state in the kiln as two colored industrial TV monitoring devices of auxiliary equipment.
Claims (3)
1. rotary kiln thermal process automaton, make up by the thermal parameter measuring instrument, apparatus for automatic control combination and execution instrument combination and auxiliary equipment constitute, described thermal parameter measuring instrument combination comprises fiber ratio color temperature sensor and converter, slip circle type thermal detector and time-delay retainer, oxygen content transducer, the three is connected to the apparatus for automatic control combination respectively by cable, described apparatus for automatic control combination is by CE/operator panel, and include the PID controller, two dimension Weighted Fuzzy Logic controllers, the computer of function such as soft personal control and process status arbiter is formed, it is characterized in that described fiber ratio color temperature sensor is installed on the support of cylinder of rotary kiln front end, this support can move up and down, a circular hole is opened in the upper left survey of rotary kiln head-shield end face, the optical foresight of fiber ratio color temperature sensor sees through the material target that clinkering zone is aimed in this hole, the fiber ratio color temperature sensor is connected to converter by a newspaper optical cable.
2. rotary kiln thermal process automaton according to claim 1, it is characterized in that the slip circle type thermal detector is the arc sheetmetal that a pair of mutually insulated arranged side by side is installed on cylinder of rotary kiln, this metallic plate and cylindrical shell also insulate, the output signal of inserting a thermocouple at the rotary kiln branch place of ungirding is connected on these two arc sheetmetals, arc and rotary kiln rotate synchronously, below arc, withstood on brush on the arc by a pair of by spring, signal is extracted.
3. rotary kiln thermal process automaton according to claim 1 is characterized in that oxygen content transducer is installed on the upright flue of rotary kiln afterbody, and kiln exhaust gas stream enters the air chamber of transmitter through mozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96248700 CN2294437Y (en) | 1996-12-24 | 1996-12-24 | Automatic control device for rotary-drum kiln thermodynamic process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96248700 CN2294437Y (en) | 1996-12-24 | 1996-12-24 | Automatic control device for rotary-drum kiln thermodynamic process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2294437Y true CN2294437Y (en) | 1998-10-14 |
Family
ID=33920496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96248700 Expired - Lifetime CN2294437Y (en) | 1996-12-24 | 1996-12-24 | Automatic control device for rotary-drum kiln thermodynamic process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2294437Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348939C (en) * | 2003-09-18 | 2007-11-14 | 中国铝业股份有限公司 | Intelligent control method for aluminium oxide chamotte sintering rotary kiln |
| CN100443843C (en) * | 2007-02-15 | 2008-12-17 | 缪建通 | Automatization controlling method of energy-saving environmental protection cement clinker calcining kiln |
| CN111521004A (en) * | 2020-04-11 | 2020-08-11 | 芜湖海螺水泥有限公司 | Kiln tail temperature accurate control process |
-
1996
- 1996-12-24 CN CN 96248700 patent/CN2294437Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348939C (en) * | 2003-09-18 | 2007-11-14 | 中国铝业股份有限公司 | Intelligent control method for aluminium oxide chamotte sintering rotary kiln |
| CN100443843C (en) * | 2007-02-15 | 2008-12-17 | 缪建通 | Automatization controlling method of energy-saving environmental protection cement clinker calcining kiln |
| CN111521004A (en) * | 2020-04-11 | 2020-08-11 | 芜湖海螺水泥有限公司 | Kiln tail temperature accurate control process |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINESE ALUMINIUM CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANDONG ALUMINIUM INDUSTRIAL CORP. |
|
| CP03 | Change of name, title or address |
Address after: 100814 No. 12 Fuxing Road, Beijing Patentee after: Aluminum Corporation of China Limited Address before: 255052 No. 1, five km road, Zhangdian District, Shandong, Zibo Patentee before: Shandong Aluminium Industry Co. |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |