CN110369407A - A kind of air preheater on-line cleaning device - Google Patents
A kind of air preheater on-line cleaning device Download PDFInfo
- Publication number
- CN110369407A CN110369407A CN201910515554.8A CN201910515554A CN110369407A CN 110369407 A CN110369407 A CN 110369407A CN 201910515554 A CN201910515554 A CN 201910515554A CN 110369407 A CN110369407 A CN 110369407A
- Authority
- CN
- China
- Prior art keywords
- fixedly connected
- fixed frame
- air preheater
- feed bin
- movable block
- Prior art date
- 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.)
- Pending
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 28
- 238000003331 infrared imaging Methods 0.000 claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 16
- 238000009434 installation Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 abstract description 13
- 230000000903 blocking effect Effects 0.000 abstract description 12
- 239000004071 soot Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 11
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 description 8
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 6
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 6
- 235000011130 ammonium sulphate Nutrition 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning In General (AREA)
Abstract
The invention discloses a kind of air preheater on-line cleaning devices, including fixed frame, the rear end of top and bottom on the inside of the fixed frame is fixedly connected to mounting rack, the bottom of the fixed frame outer right wall is fixedly connected with infrared imaging instrument, the fixed frame installation is fixedly connected with mounting plate in the middle part of infrared imaging instrument side, upper and lower ends on the right side of the fixed frame are fixedly connected to feed bin, and the upper and lower ends in the fixed frame on front side of side elevation are fixedly connected to fixed link.The air preheater on-line cleaning device, by the way that infrared imaging instrument, infrared sensor is arranged, cleaning situation of the air preheater initially and in working condition can be formed image, pass through the comparison of image, threaded rod is driven to rotate using motor, so that movable block drives spray head to be moved, while alkalinity material is transported to bellows interior by blower, so that alkalinity material can be accurately sprayed at blocking by spray head, consequently facilitating the soot blower carried in air preheater easily clears up blocking.
Description
Technical field
The present invention relates to mechanical equipment technical field, specially a kind of air preheater on-line cleaning device.
Background technique
After existing Denitration in Boiler putting equipment in service, the problems such as due to the escaping of ammonia and NH is generated4HSO4It is tight to cause air preheater
Weight blockage problem, in unit load 660MW, fume side difference passes through operation in 8 months in 1600Pa or so, empty
The fume side differential pressure of pre- device increases to 4500Pa, and differential pressure increases rapidly, and increasing rapidly for air preheater differential pressure causes in air and flue system
Portion's negative pressure is excessive, seriously affects the safe and stable operation of boiler plant, and air preheater blocking causes blower electric current to increase, causes
Fresh air First air, secondary air temperature are spent low, so that not energy-efficient and exhaust gas temperature be caused to increase, will affect unit on-load when serious
Ability, or even have to shut down and carry out heat exchange element flushing, existing air preheater soot blower soot blowing effect is relatively poor, causes clear
It is general to manage effect, so that the cleaning of ammonium hydrogen sulfate dirt is not thorough, such as application No. is 201820146071.6 Chinese patents, therefore,
We have proposed a kind of air preheater on-line cleaning devices to solve the above problems.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of air preheater on-line cleaning device, it is good to have cleaning effect
The advantages of, it is relatively poor to solve existing air preheater soot blower soot blowing effect, causes cleaning effect general, so that ammonium hydrogen sulfate
Dirt clears up halfway problem.
Technical solution used by the present invention solves the above problems is: a kind of air preheater on-line cleaning device, including fixation
Frame, it is characterised in that: the rear end of the top and bottom on the inside of the fixed frame is fixedly connected to mounting rack, and the fixed frame is right
The bottom of side outer wall is fixedly connected with infrared imaging instrument, and the middle part of fixed frame installation infrared imaging instrument side is fixed to be connected
It is connected to mounting plate, the upper and lower ends on the right side of the fixed frame are fixedly connected to feed bin, in the fixed frame on front side of side elevation
Upper and lower ends are fixedly connected to fixed link, and the front in the middle part of the fixed frame is fixedly connected with control switch, the mounting rack
Inside be fixedly connected with guide rod, the inside of the mounting rack is connected with threaded rod by bearing, the mounting rack
Motor is fixedly connected on outer side elevation, the power output shaft of the motor is fixedly connected with one end of threaded rod, the screw thread
Movable block is connected through a screw thread on bar, the side of the movable block is fixedly connected with connecting tube, and the outer end of the connecting tube is solid
Surely it is connected with spray head；It is fixedly connected with blower at the top of the mounting plate, is fixedly connected with outlet on the gas outlet of the blower
Pipe, the end of the escape pipe are fixedly connected with the side of feed bin, and the escape pipe is fixedly connected with electricity close to one end of feed bin
The top of magnet valve, the feed bin is movably hinged with sealing cover by connector, and side of the feed bin far from escape pipe is fixed to be connected
It is connected to bellows, one end of the bellows is fixedly connected with one end of connecting tube, the opposite side of two fixed links point
It is not fixedly connected with multiple infrared sensors symmetrically and evenly.
Preferably, the infrared imaging instrument is connected with infrared sensor by signal wire, the control switch difference
Be electrically connected motor, blower and solenoid valve.
Preferably, one end of the movable block offers the threaded hole to match with threaded rod, the movable block it is another
End offers the pilot hole to match with guide rod, and movable block and guide rod pivot bush unit.
Preferably, the top and bottom of the fixed frame offer the through-hole to match with bellows, and bellows passes through
Wear fixed frame.
Preferably, gasket is equipped between the sealing cover and feed bin.
Compared with prior art, the present invention having the following advantages that and effect: the air preheater on-line cleaning device passes through setting
Cleaning situation of the air preheater initially and in working condition can be formed image, led to by infrared imaging instrument and infrared sensor
The comparison for crossing image is able to know that the position that ammonium hydrogen sulfate dirt blocks in air preheater, drives threaded rod to rotate using motor, so that
Movable block drives spray head to be horizontally moved, the position blocked to air preheater, while alkalinity material is transported in bellows by blower
Portion allows the ammonium hydrogen sulfate dirt at blocking to react with alkalinity material so that alkalinity material can be accurately sprayed at blocking by spray head
Ammonium sulfate dirt is generated, ammonium sulfate dirt adhesion strength is not strong, consequently facilitating the soot blower carried on air preheater can be cleared up easily
Falling dirt, improves the effect of cleaning, apparatus of the present invention cleaning effect is good, and it is easy to use, it is suitble to promote the use of.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is structure top view of the invention；
Fig. 3 is usage state diagram of the invention；
Fig. 4 is use state top view of the invention.
In figure: fixed frame 1, infrared sensor 2, mounting rack 3, infrared imaging instrument 4, mounting plate 5, feed bin 6, fixed link
7, control switch 8, guide rod 9, threaded rod 10, motor 11, movable block 12, connecting tube 13, spray head 14, blower 15, escape pipe 16,
Solenoid valve 17, sealing cover 18, bellows 19, air preheater 20, shell 2001, air preheat piece 2002.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1-4, a kind of air preheater on-line cleaning device, including fixed frame 1, the top and bottom of 1 inside of fixed frame
The rear end in portion is fixedly connected to mounting rack 3, and the bottom of 1 outer right wall of fixed frame is fixedly connected with infrared imaging instrument 4, fixed
Frame 1 is installed and is fixedly connected with mounting plate 5 in the middle part of 4 side of infrared imaging instrument, and the upper and lower ends on 1 right side of fixed frame are fixed to be connected
It is connected to feed bin 6, the alkalinity of feed bin 6 being internally provided with after grinding expects that the upper and lower ends in fixed frame 1 on front side of side elevation are fixed
It is connected with fixed link 7, the front at 1 middle part of fixed frame is fixedly connected with control switch 8, and control switch 8 is convenient for control motor 11, wind
Machine 15 and solenoid valve 17 work, and the inside of mounting rack 3 is fixedly connected with guide rod 9, and the inside of mounting rack 3 is living by bearing
It is dynamic to be connected with threaded rod 10, motor 11, the power output shaft and screw thread of motor 11 are fixedly connected on the outer side elevation of mounting rack 3
One end of bar 10 is fixedly connected, and movable block 12 has been connected through a screw thread on threaded rod 10, and the side of movable block 12 is fixedly connected with
Connecting tube 13, the outer end of connecting tube 13 are fixedly connected with spray head 14, and the top of mounting plate 5 is fixedly connected with blower 15, blower 15
Gas outlet on be fixedly connected with escape pipe 16, the end of escape pipe 16 is fixedly connected with the side of feed bin 6, and escape pipe 16 is close
One end of feed bin 6 is fixedly connected with solenoid valve 17, and solenoid valve 17 can control the spray volume of alkalinity material, the both ends point of escape pipe 16
Not Lian Tong feed bin 6, the top of feed bin 6 is movably hinged with sealing cover 18 by connector, and sealing cover 18 can carry out feed opening
Sealing, feed bin 6 are fixedly connected with bellows 19, one end of bellows 19 and one end of connecting tube 13 far from the side of escape pipe 16
It is fixedly connected, the opposite side of two fixed links 7 is respectively symmetrically uniformly fixedly connected with multiple infrared sensors 2, Duo Gehong
Outside line sensor 2 is used cooperatively with infrared imaging instrument 4, the stopping state that can be apparent from inside air preheater 20.
Infrared imaging instrument 4 is connected with infrared sensor 2 by signal wire, by infrared sensor 2 by air preheater
Actual conditions inside 20 are detected, and the image of clean condition in air preheater 20 can be generated using infrared imaging instrument 4；Control
System switch 8 is electrically connected motor 11, blower 15 and solenoid valve 17 respectively, and control switch 8 can control motor 11, blower 15 and solenoid valve
17 work；One end of movable block 12 offers the threaded hole to match with threaded rod 10, and the other end of movable block 12 opens up
There are the pilot hole to match with guide rod 9, and movable block 12 and 9 pivot bush unit of guide rod, when threaded rod 10 rotates, by
In the guiding role of guide rod 9, so that movable block 12 can only move horizontally, and will not generate rotation, reach drive spray head
14 purposes moved left and right；The top and bottom of fixed frame 1 offer the through-hole to match with bellows 19, and bellows 19
Through fixed frame 1, bellows 19 be able to carry out it is flexible, be easy to use；It is equipped with gasket between sealing cover 18 and feed bin 6, improves
Sealing effect avoids the alkalinity material leakage inside feed bin 6.
The electric elements occurred in this article are electrically connected with extraneous main controller and 220V alternating current, and main controller can be meter
Calculation machine etc. plays the conventionally known equipment of control.
The principle of the present invention and advantage: a kind of air preheater on-line cleaning device, when in use, the air preheater after operation cleaning
After 20 reach steady working condition, by infrared sensor 2 by the initial situation inside air preheater 20, infrared imaging instrument 4 is utilized
The image under clean condition is generated, air preheater 20 is the product of existing maturation, and air preheater 20 is slow around central axis at work
What slow-speed was moved, air preheater 20 includes shell 2001 and air preheat piece 2002, is uniformly fixedly connected on the inner wall of shell 2001
Sky is worked as after air preheater 20 runs a period of time in multiple air preheat pieces 2002, the gap between multiple air preheat pieces 2002
Pre- 20 pressure difference of device reaches the 110-130% of rated value after certain setting value, will in the gap between multiple air preheat pieces 2002
Ammonium hydrogen sulfate dirt is blocked, is cooperated by infrared sensor 2 and infrared imaging instrument 4, infrared imaging instrument 4 can be blocked
In the case of image, by with it is unplugged before image comparison, it can be found that there is blocking, and know the position of blocking, root
Distance according to blocking position from upper 14 position of lower nozzle, the motor 11 of the closer one end in starting position, is driven using motor 11
Threaded rod 10 rotates, and since movable block 12 is threaded on threaded rod 10, and movable block 12 is internally provided with guide rod 9,
And then when the drive rotation of threaded rod 10 of motor 11, so that movable block 12 can only move horizontally, thus 12 band of movable block
Dynamic spray head 14 is horizontally moved, so that spray head 14 is moved at blocking position, passes through escape pipe 16 for feed bin 6 using blower 15
Internal alkalinity material is blown into the inside of bellows 19 and connecting tube 13, then sprays from spray head 14, can accurately allow alkalinity
Material is sprayed on the dirt of the ammonium hydrogen sulfate at blocking, is allowed ammonium hydrogen sulfate dirt to react with alkalinity material and is generated ammonium sulfate dirt, ammonium sulfate dirt is viscous
Attached power is not strong, consequently facilitating the soot blower carried on air preheater 20 easily clears up it.
To sum up, the air preheater on-line cleaning device can be incited somebody to action by setting infrared imaging instrument 4 and infrared sensor 2
Cleaning situation of the air preheater 20 initially and in working condition forms image, by the comparison of image, motor 11 is utilized to drive screw thread
Bar 10 rotates, so that movable block 12 drives spray head 14 to be horizontally moved, the position blocked to air preheater 20, and while blower 15 will
Alkalinity material is transported to inside bellows 19, so that alkalinity material can be accurately sprayed at blocking by spray head 14, is allowed at blocking
Ammonium hydrogen sulfate dirt with alkalinity material react generate ammonium sulfate dirt, ammonium sulfate dirt adhesion strength is not strong, consequently facilitating on air preheater 20 certainly
The soot blower of band can easily clean up dirt, improve the effect of cleaning, apparatus of the present invention cleaning effect is good, user
Just, it is suitble to promote the use of.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of air preheater on-line cleaning device, including fixed frame (1), it is characterised in that: the top on the inside of the fixed frame (1)
It is fixedly connected to mounting rack (3) with the rear end of bottom, the bottom of fixed frame (1) outer right wall is fixedly connected with infrared ray
Imager (4), fixed frame (1) installation is fixedly connected with mounting plate (5) in the middle part of infrared imaging instrument (4) side, described
Upper and lower ends on the right side of fixed frame (1) are fixedly connected to feed bin (6), and up and down two on front side of the interior side elevation of the fixed frame (1)
End is fixedly connected to fixed link (7), and the front in the middle part of the fixed frame (1) is fixedly connected with control switch (8), the installation
It is fixedly connected on the inside of frame (3) guide rod (9), the inside of the mounting rack (3) is connected with threaded rod by bearing
(10), it is fixedly connected with motor (11) on the outer side elevation of the mounting rack (3), the power output shaft and spiral shell of the motor (11)
One end of rasp bar (10) is fixedly connected, and has been connected through a screw thread movable block (12), the movable block on the threaded rod (10)
(12) side is fixedly connected with connecting tube (13), and the outer end of the connecting tube (13) is fixedly connected with spray head (14)；The peace
It is fixedly connected at the top of loading board (5) blower (15), is fixedly connected with escape pipe (16), institute on the gas outlet of the blower (15)
The end for stating escape pipe (16) is fixedly connected with the side of feed bin (6), and the escape pipe (16) is fixed close to the one end of feed bin (6)
It is connected with solenoid valve (17), the top of the feed bin (6) is movably hinged with sealing cover (18) by connector, the feed bin (6)
It is fixedly connected with bellows (19) far from the side of escape pipe (16), the one of one end of the bellows (19) and connecting tube (13)
End is fixedly connected, and two opposite sides of the fixed link (7) are respectively symmetrically uniformly fixedly connected with multiple infrared sensors
(2).
2. air preheater on-line cleaning device according to claim 1, it is characterised in that: the infrared imaging instrument (4) and
Infrared sensor (2) is connected by signal wire, and the control switch (8) is electrically connected motor (11), blower (15) and electromagnetism respectively
Valve (17).
3. air preheater on-line cleaning device according to claim 1, it is characterised in that: open one end of the movable block (12)
Equipped with the threaded hole to match with threaded rod (10), the other end of the movable block (12) is offered to match with guide rod (9)
Pilot hole, and movable block (12) and guide rod (9) pivot bush unit.
4. air preheater on-line cleaning device according to claim 1, it is characterised in that: the top of the fixed frame (1) and
Bottom offers the through-hole to match with bellows (19), and bellows (19) runs through fixed frame (1).
5. air preheater on-line cleaning device according to claim 1, it is characterised in that: the sealing cover (18) and feed bin
(6) gasket is equipped between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910515554.8A CN110369407A (en) | 2019-06-14 | 2019-06-14 | A kind of air preheater on-line cleaning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910515554.8A CN110369407A (en) | 2019-06-14 | 2019-06-14 | A kind of air preheater on-line cleaning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110369407A true CN110369407A (en) | 2019-10-25 |
Family
ID=68250312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910515554.8A Pending CN110369407A (en) | 2019-06-14 | 2019-06-14 | A kind of air preheater on-line cleaning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110369407A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007730A (en) * | 2021-02-25 | 2021-06-22 | 广州卓博机电科技有限公司 | Rotary type heat exchanger ash and scale online continuous cleaning device |
| CN113686195A (en) * | 2021-07-07 | 2021-11-23 | 华能伊春热电有限公司 | Clear stifled equipment of sack dust remover unit air preheater intelligent monitoring |
| US20220349664A1 (en) * | 2019-07-26 | 2022-11-03 | Geesco Co., Ltd. | Heat exchanger cleaning system and heat exchanger cleaning method |
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| DE10348013A1 (en) * | 2003-10-15 | 2005-05-19 | Josef Seelen Gmbh | Soot blower control system for boiler or furnace flues uses optical acoustic or electromagnetic imaging system to produce picture to be compared with reference picture stored in computer |
| CN104338704A (en) * | 2014-09-16 | 2015-02-11 | 国家电网公司 | Method and device for cleaning air preheater of coal-fired power plant boiler SCR (selective catalytic reduction) denitration system online |
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| CN210632586U (en) * | 2019-06-14 | 2020-05-29 | 华电电力科学研究院有限公司 | Online cleaning device for air preheater |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4256511A (en) * | 1979-09-17 | 1981-03-17 | The Dow Chemical Company | High energy wash of ljungstrom air preheater |
| US5366561A (en) * | 1993-05-06 | 1994-11-22 | Butterworth Jetting Systems, Inc. | Air preheater cleaning method |
| DE10348013A1 (en) * | 2003-10-15 | 2005-05-19 | Josef Seelen Gmbh | Soot blower control system for boiler or furnace flues uses optical acoustic or electromagnetic imaging system to produce picture to be compared with reference picture stored in computer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220349664A1 (en) * | 2019-07-26 | 2022-11-03 | Geesco Co., Ltd. | Heat exchanger cleaning system and heat exchanger cleaning method |
| CN113007730A (en) * | 2021-02-25 | 2021-06-22 | 广州卓博机电科技有限公司 | Rotary type heat exchanger ash and scale online continuous cleaning device |
| CN113686195A (en) * | 2021-07-07 | 2021-11-23 | 华能伊春热电有限公司 | Clear stifled equipment of sack dust remover unit air preheater intelligent monitoring |
| CN113686195B (en) * | 2021-07-07 | 2023-10-27 | 华能伊春热电有限公司 | Intelligent monitoring and blocking removing equipment for air pre-heater of bag-type dust collector unit |
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Application publication date: 20191025 |
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| RJ01 | Rejection of invention patent application after publication |