CN109578089A - 300MW critical steam turbine reheating main steam valve valve stem leakoff troubleshooting methodology - Google Patents
300MW critical steam turbine reheating main steam valve valve stem leakoff troubleshooting methodology Download PDFInfo
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- CN109578089A CN109578089A CN201811511630.XA CN201811511630A CN109578089A CN 109578089 A CN109578089 A CN 109578089A CN 201811511630 A CN201811511630 A CN 201811511630A CN 109578089 A CN109578089 A CN 109578089A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Valves (AREA)
- Lift Valve (AREA)
Abstract
300MW critical steam turbine reheating main steam valve valve stem leakoff troubleshooting methodology.There is reheating main steam valve valve stem leakoff phenomenon after going into operation 7,8 years successively in 300MW critical steam turbine.The method of the present invention includes that (1) judges whether valve rod steam-overflowing tube road blocks；(2) judge whether valve rod occurs sidesway in operation；(3) judge valve stem seal face with the presence or absence of failure phenomenon；After successively carrying out malfunction elimination in terms of above three, it returns after filling each component, valve rod is pulled using drawing valve rod tool, valve rod can be pulled with the power much smaller than vapor action power in operation, it surveys valve rod amount of side-shift and increases 1.5mm, while checking that grommet has been compacted, cannot move freely again, valve stem leakoff phenomenon completely disappears after booting, illustrates that reheating main steam valve valve stem leakoff failure has excluded.The present invention is applied to the leakage vapour troubleshooting of 300MW critical steam turbine reheating main steam valve valve rod.
Description
Technical field:
The present invention relates to a kind of and 300MW critical steam turbine reheating main steam valve valve stem leakoff troubleshooting methodologies.
Background technique:
There is the valve stem leakoff of 300MW critical steam turbine reheating main steam valve after going into operation 7,8 years successively in 300MW critical steam turbine
Several have valve stem leakoff phenomenon in the reheating main steam valve during debugging always in phenomenon or even unit.Debugging and 168h examination
During operation, no matter unit load height, wherein there is serious steam leakage phenomenon in reheating main steam valve valve rod；In addition unit
Temperature at crank is measured when at full capacity, normal valve and suspicious valve are respectively 170 °C, 260 °C, and the notable difference of temperature also confirms that can
Doubt valve serious steam leakage.If leaking vapour for a long time, very big waste will also result in addition to safety factor, it is necessary to thoroughly eliminate failure as early as possible.
Criticality benchmark adjusts combined regulating valve equipped with the main vapour of 2 reheating, respectively includes 1 rocking plate type stop valve and 2 regulating valves.
Reheating main steam valve is mainly by rocker arm, the valve setting being suspended on rocker arm, the valve rod and oil control tripping valve being connected by key with rocker arm
Composition, valve rod are connected by crank, connecting rod with oil motor connecting rod.Grommet and embedded rings are housed, to prevent steam from letting out on valve rod
Leakage；Elastic conjunction is used between embedded rings and valve rod, and have the grommet of unilateral ball type of contact surface be mounted on embedded rings and bearing B it
Between (see figure 1).
After unit is opened, reheating main steam valve is opened, oil control tripping valve is closed, and the indoor steam pressure of bearing gradually rises
Height, under steam pressure, valve rod is pushed to valve support executing agency side, while the perpendicular contact between embedded rings and grommet
Ball type of contact surface between face, grommet and bearing B tightly contacts, thus can effectively prevent along valve rod steam leakage (see
Fig. 2).Unit at full capacity when reheated steam rated pressure 3.674MPa, stem diameter 124.6mm, the sidesway power that valve rod is subject to is about
For 34.2kN, act on two lesser sealing surfaces of area,
Failure reason analysis:
(1) valve rod steam-overflowing tube road blocks.Slight steam leakage existing for grommet sealing surface can be introduced into towards gland heater
Negative pressure steam-overflowing tube road, has both recycled working medium and thermal energy, in turn ensures the safety of the person and equipment.If valve rod steam-overflowing tube road has occurred
Blocking, steam is inevitable to leak to atmosphere along valve rod.
(2) sidesway does not occur for valve rod, that is, grommet is not pushed down in movement to valve rod to the right.The prerequisite item of valve rod generation sidesway
There are two parts, first is that there is sufficiently large sidesway power i.e. steam pressure；Second is that valve rod cannot have improper resistance during sidesway
Power.
1. there are failures for oil control tripping valve.Its valve rod is not turned off in place or valve core sealed cover tightness is poor, and there are larger
Leakage, can all cause to fail to establish enough steam pressures in bearing room on the right side of stop valve valve rod, valve rod cannot be pushed to the right
Side is mobile.
2. in 10 processing dimension of key between valve rod and crank, there are deviations.If key size is partially long, it is likely that in generation
When stating improper resistance, i.e. valve rod sidesway, keyway pushes key to move to the right together on valve rod, when axle sleeve is answered back in the outer end of key
It will meet obstructions when D, key stops outer shifting later, while valve rod also stops outer shifting, but the both sides sealing face of grommet is not yet this moment
Compacting, causes to leak.
(3) there are failure phenomenons in valve stem seal face.First is that the sealing surface existing defects of embedded rings or being mingled with foreign matter；Second is that lining
Ball type of contact surface existing defects between ring and bearing B are mingled with foreign matter.
Summary of the invention:
In order to overcome the above problem, the object of the present invention is to provide a kind of 300MW critical steam turbine reheating main steam valve valve stem leakoffs
Troubleshooting methodology.
Above-mentioned purpose is realized by following technical scheme:
A kind of 300MW critical steam turbine reheating main steam valve valve stem leakoff troubleshooting methodology, this troubleshooting methodology include: (1)
Judge whether valve rod steam-overflowing tube road blocks；(2) judge whether valve rod occurs sidesway in operation；(3) judging valve stem seal face is
It is no that there are failure phenomenons；To malfunction elimination is successively carried out in terms of above three, it is described that specific step is as follows:
1. unit operation in remove steam-overflowing tube heat preservation, with infrared thermometer test pipe temperature, 170 ° of control group normal valve side,
It is tested 270 ° of suspicious valve side, illustrates to be tested suspicious valve side leakage gas serious, unit outage, cuts open the road inspection of valve rod steam-overflowing tube, it is internal
Unimpeded foreign, then valve rod steam-overflowing tube road is unplugged, otherwise excludes foreign matter；
2. pipe temperature after detection oil control tripping valve, 170 °C of control group normal valve side is tested 70 °C of suspicious valve side, illustrates tested
Suspicious valve side oil control tripping valve is closed tightly, and sidesway problem, compressor emergency shutdown, with red lead powder test valve occur in operation for no valve rod
Sealing surface, the contact of 100% line, excluding oil control tripping valve, there are the possibility of failure；
Valve rod and valve support end face relative distance when measuring and recording operation measure this numerical value discovery variation only after unit outage again
There is 0.4mm, illustrates that running forward and backward valve rod occurs mobile only 0.4mm, opens valve upper cover after shutdown, measurement rocker arm two sides
Gap summation, gap sum data check it has been found that grommet is in free state, in order to test at this time in the range of designing allows
Card valve rod whether can move to the right, using draw valve rod tool give valve rod apply a pulling force moved outward, power it is big
Small to rest between 30~35kN, measuring displacement of valve rod amount is 0.4~0.5mm, at this moment observes grommet again and is still within free shape
State, rotation flexibly, illustrate that sealing surface is not in contact, therefore judge valve rod in operation sidesway cannot occur to be that valve rod is caused to leak
The reason of vapour；
The bearing and adjacent key of reheating main steam valve valve rod end are checked, if the bearing inner side end has bright Friction mark
The corresponding position of mark, the adjacent key also has abrasion mark, thus judges that more serious collision and friction occurred for key and bearing,
Key length size is partially long, is the reason of valve rod is unable to sidesway；It is 1.5mm according to gap at grommet, therefore the key is removed into length
2mm is spent, and keyway on key and axis is carried out trial assembly, reaches keyway semi-circular portions in the semi-circular portions and axis of key and cooperates close, nothing
Axial bite phenomenon not in place, the cooperation of measurement key and valve rod and crank reach design cooperation and require；
With the ball type of contact surface between red lead powder dyeing inspection grommet and bearing, contacts trace and show good seal, there is no connect
Touch bad situation；The perpendicular contact face between embedded rings and grommet is checked, between red lead powder dyeing inspection embedded rings and grommet
Perpendicular contact face, show this perpendicular contact face 3/4 contact, therefore judge this perpendicular contact face contact be unevenly also valve rod leakage
One of the reason of vapour, grinds embedded rings sealing surface using drum type brake milling tool, and the inner hole of drum type brake milling tool is straight
Diameter is 0.2mm bigger than stem diameter, end face width be slightly larger than embedded rings sealing surface, paste gum sand paper, to embedded rings sealing surface into
Row lappingout, the perpendicular contact face after lappingout between red lead powder dyeing inspection embedded rings and grommet, it is ensured that 360 ° of contacts；
It returns after filling each component, using drawing valve rod tool to pull valve rod, can be pulled with the power much smaller than vapor action power in operation
Valve rod, actual measurement valve rod amount of side-shift increases 1.5mm, while checking that grommet has been compacted, and cannot move freely again, valve rod after booting
Leakage vapour phenomenon completely disappears, and illustrates that reheating main steam valve valve stem leakoff failure has excluded.
Beneficial effects of the present invention:
The present invention solves valve stem leakoff problem satisfactorily in the case where not dismantling valve rod, through above-mentioned troubleshooting steps
Certainly, valve rod gas leak phenomenon is finally successfully eliminated.
Detailed description of the invention:
Attached drawing 1 is the assembling schematic diagram of reheating main steam valve valve rod of the present invention.In figure, 1 is bearing cap, and 2 be bearing chamber, and 3 be bearing
A, 4 be key, and 5 be embedded rings, and 6 be grommet, and 7 be bearing B, and 8 be the port that overflows, and 9 be bearing C, and 10 be key, and 11 be bearings D, and 12 be oil
Control tripping valve, 13 be rocker arm, and 14 be valve setting, and 15 be valve rod, and 16 be valve body, and 17 be valve support, and 18 be crank, and 19 be connecting rod.
Attached drawing 2 is the schematic enlarged-scale view in attached drawing 1 at T.In figure, 20 are contacted for 360 ° of complete cycles, at grinding.
Attached drawing 3 is the use schematic diagram that the present invention draws valve rod tool.In figure, 21 be bolt, and 22 be nut, and 23 be iron plate,
24 be steel pipe.Bolt is connected through a screw thread with valve rod, and the porose iron plate in center is welded on the end face of steel pipe, and two nuts are pacified respectively
On bolt, one of them is withstood on valve rod, another withstands on iron plate.
Specific embodiment:
Embodiment 1:
A kind of 300MW critical steam turbine reheating main steam valve valve stem leakoff troubleshooting methodology, this troubleshooting methodology include: (1)
Judge whether valve rod steam-overflowing tube road blocks；(2) judge whether valve rod occurs sidesway in operation；(3) judging valve stem seal face is
It is no that there are failure phenomenons；To malfunction elimination is successively carried out in terms of above three, it is described that specific step is as follows:
1. unit operation in remove steam-overflowing tube heat preservation, with infrared thermometer test pipe temperature, 170 ° of control group normal valve side,
It is tested 270 ° of suspicious valve side, illustrates to be tested suspicious valve side leakage gas serious, unit outage, cuts open the road inspection of valve rod steam-overflowing tube, it is internal
Unimpeded foreign, then valve rod steam-overflowing tube road is unplugged, otherwise excludes foreign matter；
2. pipe temperature after detection oil control tripping valve, 170 °C of control group normal valve side is tested 70 °C of suspicious valve side, illustrates tested
Suspicious valve side oil control tripping valve is closed tightly, and sidesway problem, compressor emergency shutdown, with red lead powder test valve occur in operation for no valve rod
Sealing surface, the contact of 100% line, excluding oil control tripping valve, there are the possibility of failure；
Valve rod and valve support end face relative distance when measuring and recording operation measure this numerical value discovery variation only after unit outage again
There is 0.4mm, illustrates that running forward and backward valve rod occurs mobile only 0.4mm, opens valve upper cover after shutdown, measurement rocker arm two sides
Gap summation, gap sum data check it has been found that grommet is in free state, in order to test at this time in the range of designing allows
Card valve rod whether can move to the right, using draw valve rod tool give valve rod apply a pulling force moved outward, power it is big
Small to rest between 30~35kN, measuring displacement of valve rod amount is 0.4~0.5mm, at this moment observes grommet again and is still within free shape
State, rotation flexibly, illustrate that sealing surface is not in contact, therefore judge valve rod in operation sidesway cannot occur to be that valve rod is caused to leak
The reason of vapour；
The bearing and adjacent key of reheating main steam valve valve rod end are checked, if the bearing inner side end has bright Friction mark
The corresponding position of mark, the adjacent key also has abrasion mark, thus judges that more serious collision and friction occurred for key and bearing,
Key length size is partially long, is the reason of valve rod is unable to sidesway；It is 1.5mm according to gap at grommet, therefore the key is removed into length
2mm is spent, and keyway on key and axis is carried out trial assembly, reaches keyway semi-circular portions in the semi-circular portions and axis of key and cooperates close, nothing
Axial bite phenomenon not in place, the cooperation of measurement key and valve rod and crank reach design cooperation and require；
With the ball type of contact surface between red lead powder dyeing inspection grommet and bearing, contacts trace and show good seal, there is no connect
Touch bad situation；The perpendicular contact face between embedded rings and grommet is checked, between red lead powder dyeing inspection embedded rings and grommet
Perpendicular contact face, show this perpendicular contact face 3/4 contact, therefore judge this perpendicular contact face contact be unevenly also valve rod leakage
One of the reason of vapour, grinds embedded rings sealing surface using drum type brake milling tool, and the inner hole of drum type brake milling tool is straight
Diameter is 0.2mm bigger than stem diameter, end face width be slightly larger than embedded rings sealing surface, paste gum sand paper, to embedded rings sealing surface into
Row lappingout, the perpendicular contact face after lappingout between red lead powder dyeing inspection embedded rings and grommet, it is ensured that 360 ° of contacts；
It returns after filling each component, using drawing valve rod tool to pull valve rod, can be pulled with the power much smaller than vapor action power in operation
Valve rod, actual measurement valve rod amount of side-shift increases 1.5mm, while checking that grommet has been compacted, and cannot move freely again, valve rod after booting
Leakage vapour phenomenon completely disappears, and illustrates that reheating main steam valve valve stem leakoff failure has excluded.
Embodiment 2:
According to 300MW critical steam turbine reheating main steam valve valve stem leakoff troubleshooting methodology described in embodiment 1, measure and record
Valve rod and valve support end face relative distance when operation measure the discovery variation of this numerical value after unit outage again and there was only 0.4mm, illustrates to transport
Mobile only 0.4mm occurs for the forward and backward valve rod of row.Valve upper cover is opened after shutdown, measures the gap summation of rocker arm two sides, and data are aobvious
Show and meet drawing requirement, checks that discovery grommet is in free state at this time.In order to verify whether valve rod can move to the right, benefit
The specific purpose tool of a drawing valve rod is made of the M30 screw hole at valve rod outer end face center, artificially applies one outward to valve rod
The size of mobile pulling force, power rests between 30~35kN, and measuring displacement of valve rod amount is 0.4~0.5mm, at this moment observes lining again
Ring is still within free state, rotation flexibly, it is clear that sealing surface is not in contact.Therefore judge that valve rod cannot occur in operation
Sidesway is the main reason for causing valve stem leakoff.
Find that its inner side end has bright abrasion mark, at the same time, the corresponding position of key 10 when checking bearings D
There is abrasion mark.It is possible thereby to judge that more serious collision and friction occurred for key 10 and bearings D, the length dimension of key 10 is inclined
It is long, it is the reason of valve rod is unable to sidesway.Be 1.5mm according to gap at current grommet, therefore key removes length 2mm, and key and
Keyway carries out trial assembly on axis, and it is closely, not in place without axial bite to reach keyway semi-circular portions cooperation in the semi-circular portions and axis of key
The phenomenon that.The cooperation of measurement key and valve rod and crank reaches drawing cooperation and requires.
Judge valve stem seal face with the presence or absence of failure phenomenon:
1. contact trace shows good seal with the ball type of contact surface between red lead powder dyeing inspection grommet and bearing B, it is not present
The case where poor contact.
2. checking the perpendicular contact face between embedded rings and grommet.
Perpendicular contact face between red lead powder dyeing inspection embedded rings and grommet shows that this perpendicular contact face about 3/4 connects
One of touching, therefore judge the reason of this perpendicular contact face contact is unevenly also valve stem leakoff.It is limited to the particularity of valve arrangement, it is embedding
Enter ring interference on valve shaft, field position is narrow, checks that the sealing surface of grinding embedded rings needs to split out valve rod to suitable position
It sets, unavoidably to increase the workload of demolition, installation valve rod, the time will at least increase by 2 days or more.To reduce labor intensity and work
Amount, service personnel have made the dedicated milling tool of drum type brake according to on-site actual situations.Tool inner bore diameter is bigger than stem diameter
0.2mm, end face width are slightly larger than embedded rings sealing surface, paste gum sand paper, carry out lappingout to embedded rings sealing surface.Lappingout terminates
Perpendicular contact face between red lead powder dyeing inspection embedded rings and grommet afterwards, it is ensured that 360 ° of contacts.
Claims (2)
1. a kind of 300MW critical steam turbine reheating main steam valve valve stem leakoff troubleshooting methodology, it is characterized in that: this troubleshooting side
Method includes: that (1) judges whether valve rod steam-overflowing tube road blocks；(2) judge whether valve rod occurs sidesway in operation；(3) judge valve
Bar sealing surface whether there is failure phenomenon；To malfunction elimination is successively carried out in terms of above three, it is described that specific step is as follows:
(1) steam-overflowing tube heat preservation is removed in unit operation, tests pipe temperature, control group normal valve side with infrared thermometer
170 °, it is tested 270 ° of suspicious valve side, illustrates to be tested suspicious valve side leakage gas serious, unit outage cuts open the road inspection of valve rod steam-overflowing tube,
Internal unimpeded foreign, then valve rod steam-overflowing tube road is unplugged, otherwise excludes foreign matter.
2. pipe temperature after detection oil control tripping valve, 170 °C of control group normal valve side is tested 70 °C of suspicious valve side, illustrates tested
Suspicious valve side oil control tripping valve is closed tightly, and sidesway problem, compressor emergency shutdown, with red lead powder test valve occur in operation for no valve rod
Sealing surface, the contact of 100% line, excluding oil control tripping valve, there are the possibility of failure；
Valve rod and valve support end face relative distance when measuring and recording operation measure this numerical value discovery variation only after unit outage again
There is 0.4mm, illustrates that running forward and backward valve rod occurs mobile only 0.4mm, opens valve upper cover after shutdown, measurement rocker arm two sides
Gap summation, gap sum data check it has been found that grommet is in free state, in order to test at this time in the range of designing allows
Card valve rod whether can move to the right, using draw valve rod tool give valve rod apply a pulling force moved outward, power it is big
Small to rest between 30~35kN, measuring displacement of valve rod amount is 0.4~0.5mm, at this moment observes grommet again and is still within free shape
State, rotation flexibly, illustrate that sealing surface is not in contact, therefore judge valve rod in operation sidesway cannot occur to be that valve rod is caused to leak
The reason of vapour；
The bearing and adjacent key of reheating main steam valve valve rod end are checked, if the bearing inner side end has bright Friction mark
The corresponding position of mark, the adjacent key also has abrasion mark, thus judges that more serious collision and friction occurred for key and bearing,
Key length size is partially long, is the reason of valve rod is unable to sidesway；It is 1.5mm according to gap at grommet, therefore the key is removed into length
2mm is spent, and keyway on key and axis is carried out trial assembly, reaches keyway semi-circular portions in the semi-circular portions and axis of key and cooperates close, nothing
Axial bite phenomenon not in place, the cooperation of measurement key and valve rod and crank reach design cooperation and require；
With the ball type of contact surface between red lead powder dyeing inspection grommet and bearing, contacts trace and show good seal, there is no connect
Touch bad situation；The perpendicular contact face between embedded rings and grommet is checked, between red lead powder dyeing inspection embedded rings and grommet
Perpendicular contact face, show this perpendicular contact face 3/4 contact, therefore judge this perpendicular contact face contact be unevenly also valve rod leakage
One of the reason of vapour, grinds embedded rings sealing surface using drum type brake milling tool, and the inner hole of drum type brake milling tool is straight
Diameter is 0.2mm bigger than stem diameter, end face width be slightly larger than embedded rings sealing surface, paste gum sand paper, to embedded rings sealing surface into
Row lappingout, the perpendicular contact face after lappingout between red lead powder dyeing inspection embedded rings and grommet, it is ensured that 360 ° of contacts；
It returns after filling each component, using drawing valve rod tool to pull valve rod, can be pulled with the power much smaller than vapor action power in operation
Valve rod, actual measurement valve rod amount of side-shift increases 1.5mm, while checking that grommet has been compacted, and cannot move freely again, valve rod after booting
Leakage vapour phenomenon completely disappears, and illustrates that reheating main steam valve valve stem leakoff failure has excluded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811511630.XA CN109578089A (en) | 2018-12-11 | 2018-12-11 | 300MW critical steam turbine reheating main steam valve valve stem leakoff troubleshooting methodology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811511630.XA CN109578089A (en) | 2018-12-11 | 2018-12-11 | 300MW critical steam turbine reheating main steam valve valve stem leakoff troubleshooting methodology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111876535A (en) * | 2020-07-30 | 2020-11-03 | 北京首钢股份有限公司 | Method for adjusting sealing valve of charging bucket at top of blast furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58113892A (en) * | 1981-12-28 | 1983-07-06 | 株式会社東芝 | Main steam isolation valve leakage suppression device |
| CN207364412U (en) * | 2017-10-29 | 2018-05-15 | 哈尔滨华唐电站成套设备有限公司 | A kind of air-leakage preventing device for steam turbine reheating main steam valve |
-
2018
- 2018-12-11 CN CN201811511630.XA patent/CN109578089A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58113892A (en) * | 1981-12-28 | 1983-07-06 | 株式会社東芝 | Main steam isolation valve leakage suppression device |
| CN207364412U (en) * | 2017-10-29 | 2018-05-15 | 哈尔滨华唐电站成套设备有限公司 | A kind of air-leakage preventing device for steam turbine reheating main steam valve |
Non-Patent Citations (1)
| Title |
|---|
| 王彦海，冯爱华，冯爱斌，殷立科: "600MW超临界汽轮机再热主汽阀阀杆漏汽分析及处理", 《发电设备》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111876535A (en) * | 2020-07-30 | 2020-11-03 | 北京首钢股份有限公司 | Method for adjusting sealing valve of charging bucket at top of blast furnace |
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Application publication date: 20190405 |