CN107096334A - One kind filtering tube sheet and pulse backblowing deashing device - Google Patents
One kind filtering tube sheet and pulse backblowing deashing device Download PDFInfo
- Publication number
- CN107096334A CN107096334A CN201710440589.0A CN201710440589A CN107096334A CN 107096334 A CN107096334 A CN 107096334A CN 201710440589 A CN201710440589 A CN 201710440589A CN 107096334 A CN107096334 A CN 107096334A
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- Prior art keywords
- filter tube
- filter
- blowing
- gas
- group
- 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
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- 238000001914 filtration Methods 0.000 title abstract description 17
- 239000000428 dust Substances 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 238000007664 blowing Methods 0.000 claims description 57
- 238000003860 storage Methods 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 66
- 238000011010 flushing procedure Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- 230000035939 shock Effects 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
- B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Tube sheet is filtered the invention provides one kind, including：1 circular bottom plate, the cone current divider of more than 4；Wherein, more than four groups of injection unit is provided with bottom plate；Region shared by every group of injection unit is totally a border circular areas, and each border circular areas center is fixed and is equiped with 1 cone current divider, and uniformly 3 chimney filter entrances are offered around each cone current divider.Present invention also offers a kind of pulse backblowing deashing device, including filtering tube sheet, the filter tank, the gas access for being passed through dusty gas, chimney filter, gas vent, injector, blowback pipeline, blowback air accumulator for exporting the clean gas by filtering.Filtering tube sheet of the present invention can be widely applied to dust removal field with including the features such as pulse backblowing deashing device of the filtering tube sheet has good dedusting effect, service life is long.
Description
Technical Field
The invention belongs to the technical field of gas-solid separation, and relates to a filter tube plate and a pulse back-blowing ash removal device.
Background
In chemical, petroleum, metallurgy, electric power and other industries, high-temperature dust-containing gas is often generated. With the improvement of energy saving and environmental protection requirements, high-temperature dust-containing gas needs to be subjected to energy recovery, and the gas is discharged according to the environmental protection discharge standard. For this reason, it is necessary to remove dust from these high-temperature dusty gases, i.e., to perform gas-solid separation directly under high-temperature conditions to achieve gas purification.
In practical application, rigid high-temperature filtering elements such as ceramic filter tubes, metal filter tubes and the like have good anti-seismic performance, high temperature resistance, corrosion resistance, thermal shock performance, filtering precision and filtering efficiency, so that the high-temperature gas filtering element is widely applied to the field of high-temperature gas purification. At present, a gas ejector in a pulse back-blowing ash removal device is conical, the length of jet flow sprayed by a nozzle is limited, and energy is concentrated at the position of an axis; and the filter tube distributes in the axis outer lane, and the efflux of axis position collides with the tube sheet, causes energy loss for the soot blowing effect of filter tube outside the axis is relatively poor. In order to improve the soot blowing effect, a mode of improving the back-blowing soot cleaning pressure is generally adopted; however, the filter tube is subjected to a large impact force by increasing the back-blowing ash-removing pressure under the working conditions of high temperature and high pressure, so that the filter tube is vibrated, damaged or even broken.
In conclusion, in the prior art, the pulse back-blowing ash removal device has the problems of poor ash removal effect, short service life and the like.
Disclosure of Invention
In view of this, the invention aims to provide a filter tube plate and a pulse back-blowing ash removal device with good ash removal effect and long service life.
In order to achieve the purpose, the technical scheme of the filter tube plate provided by the invention is as follows:
a filter tube sheet comprising: 1 circular bottom plate and more than 4 cone flow dividers; wherein, more than four groups of injection units are arranged on the bottom plate; the total area occupied by each group of injection units is a circular area, 1 cone splitter is fixedly arranged at the center of each circular area, and 3 filter tube inlets are uniformly formed around each cone splitter.
In order to achieve the purpose of the invention, the technical scheme of the pulse back-blowing ash removal device provided by the invention is as follows:
a pulse back-blowing ash removal device comprises a filter tube plate, a filter tank, a gas inlet for introducing dust-containing gas, a filter tube, a gas outlet for leading out filtered clean gas, an ejector, a back-blowing pipeline and a back-blowing gas storage tank; wherein,
the filter tank consists of a body and an ash bucket, the ash bucket is positioned at the lower end of the body, and the ash bucket is movably connected with the body; the body is of a cylindrical structure, and the ash bucket is of an inverted trapezoidal barrel-shaped structure. The filter tube plate is arranged in the filter tank, and the outer diameter of the filter tube plate is equal to the inner diameter of the filter tank; the filter tube plate divides the filter tank body into an upper part and a lower part, wherein the upper part is a clean gas chamber, and the lower part is a dust-containing gas chamber; the upper part of the clean gas chamber is provided with a gas outlet, and the lower part of the dusty gas chamber is provided with a gas inlet. More than four filter tube groups are arranged in the dust-containing gas chamber, and each filter tube group comprises 3 filter tubes; more than four filter tube groups correspond to more than four groups of injection units on the filter tube plate one by one; every filter tube group all installs in corresponding and draws and penetrate the unit below, and 3 filter tube one end are fixed in respectively and correspond 3 filter tube entrances that draw and penetrate the unit, and 3 filter tube other ends are unsettled. In the clean gas cavity, more than 4 cone diverters above the filter tube plate are respectively and correspondingly sleeved with 1 ejector. The back-blowing gas storage tank is provided with more than 4 groups of back-blowing pipelines, and 1 group of back-blowing pipelines corresponds to 1 ejector; the outlet end of each group of back-blowing pipelines is provided with 1 nozzle which is arranged at the inlet of the corresponding ejector.
In summary, when the pulse back-blowing ash removal device of the present invention works normally, the dust-containing gas enters the dust-containing gas chamber through the gas inlet of the filtering device, the dust-containing gas is filtered through the porous channel of the filtering pipe, the dust particles in the gas flow are intercepted on the outer surface of the filtering pipe and form a cake layer, and the filtered clean gas enters the clean gas chamber and is discharged through the gas outlet. Along with the continuous process of filtration, the cake layer on the outer surface of the filter tube is gradually thickened, so that the pressure drop inside the filter tube is increased, and therefore ash removal treatment needs to be carried out on the cake, and the performance of the filter tube is regenerated. When the pulse back-blowing device is used for deashing, the opening and closing time of the pulse back-blowing valve is short, and the pulse back-blowing valve belongs to a transient process. When the pulse back-flushing valve in a normally closed state is opened, high-pressure nitrogen or clean synthetic gas in the back-flushing gas storage tank instantly and sequentially enters a back-flushing pipeline and an ejector, under the ejection action of the ejector, a large amount of clean gas is introduced from a clean gas chamber and enters the gas ejector together, and is shunted by a cone shunt, the inner wall of the filter pipe is back-flushed, and the flour cake layer on the outer surface of the filter pipe is stripped by utilizing transient energy, so that the resistance of the filter pipe is basically recovered to the initial state, and the regeneration of the performance of the filter pipe is realized. According to the filter tube plate and the pulse back-blowing ash removal device with the filter tube plate, the back-blowing airflow is reasonably divided by adjusting the cone flow divider, so that the back-blowing gas is not only concentrated at the center of the floor, but the filter tubes at any positions are uniformly back-blown, the diffusion loss is reduced, the heat transfer efficiency of the ejector is improved, and the ash removal effect is improved. Meanwhile, the cone splitter divides the back-blowing gas, so that the back-blowing ash removal pressure of a single filter pipe can be reduced, the thermal shock and the vibration of the filter pipe are reduced, and the service life of the filter pipe is prolonged.
Drawings
FIG. 1 is a top view of a filter tube sheet according to the present invention.
Fig. 2 is a front view of each set of injection units on the tube sheet according to the present invention.
FIG. 3 is a schematic view of the pulse back-blowing ash removal device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a top view of a filter tube sheet according to the present invention. Fig. 2 is a front view of each set of injection units on the tube sheet according to the present invention. As shown in fig. 1 and 2, a filter tube sheet 3 according to the present invention includes: 1 circular base plate 30, 4 or more cone diverters 31; wherein, more than four groups of injection units are arranged on the bottom plate 30; the total area occupied by each group of injection units is a circular area, the center of each circular area is fixedly provided with 1 cone splitter 31, and 3 filter tube inlets 32 are uniformly arranged around each cone splitter 31.
In practical application, the number of the injection units arranged on the filter tube plate 3 can be specifically determined according to actual needs. In each group of injection units, the number of the filter tube inlets 32 can be specifically determined according to actual needs.
In the filter tube plate, the vertex angle of the cone splitter 31 is 30-80 degrees.
In the filter tube plate, in each circular area, 3 filter tube inlets 32 are distributed in a regular triangle, and the bottom edge of the cone flow divider 31 is tangent to the 3 filter tube inlets 32.
FIG. 3 is a schematic view of the pulse back-blowing ash removal device according to the present invention. As shown in FIG. 3, the pulse back-blowing ash-removing device of the present invention comprises the above-mentioned filter tube plate 3; the pulse back-blowing ash removal device further comprises: the device comprises a filter tank, a gas inlet 1 for introducing dust-containing gas, a filter pipe 2, a gas outlet 5 for leading out filtered clean gas, an ejector 6, a back-flushing pipeline 7 and a back-flushing gas storage tank 8; wherein,
the filter tank consists of a body 4 and an ash bucket 9, the ash bucket 9 is positioned at the lower end of the body 4, and the ash bucket 9 is movably connected with the body 4; the main body 4 is a cylindrical structure, and the ash bucket 9 is an inverted trapezoidal barrel-shaped structure. The filter tube plate 3 is arranged in the filter tank, and the outer diameter of the filter tube plate 3 is equal to the inner diameter of the filter tank; the filter tube plate 3 divides the filter tank body 4 into an upper part and a lower part, wherein the upper part is a clean gas chamber 41, and the lower part is a dust-containing gas chamber 42; the upper part of the clean gas chamber 41 is provided with a gas outlet 5, and the lower part of the dust-containing gas chamber 42 is provided with a gas inlet 1. More than four filter tube groups are arranged in the dust-containing gas chamber 42, and each filter tube group comprises 3 filter tubes 2; more than four filter tube groups correspond to more than four groups of injection units on the filter tube plate 3 one by one; every filter tube group all installs in corresponding and draws and penetrate the unit below, and 32 one ends of filter tube are fixed in respectively and draw 3 filter tube entry 32 departments that penetrate the unit, and 32 other ends of filter tube are unsettled. In the clean gas chamber 41, more than 4 cone flow splitters 31 above the filter tube plate 3 are respectively and correspondingly sleeved with 1 ejector 6. The back-blowing gas storage tank 8 is provided with more than 4 groups of back-blowing pipelines 7, and 1 group of back-blowing pipelines 7 corresponds to 1 ejector 6; the outlet end of each group of back-blowing pipelines 7 is provided with 1 nozzle which is arranged at the inlet of the corresponding ejector 6.
In practice, the hopper 9 is used to collect the flakes. The ejector 6 is prior art and will not be described further herein.
In practical application, the number of the filter tube groups, the number of the ejectors 6 and the number of the ejector units on the filter tube plate 3 can be specifically set according to actual needs, but the three groups need to be in one-to-one correspondence. The number of the filter tubes 2 in the filter tube group and the number of the filter tube inlets 32 in the injection unit can be specifically set according to actual needs, but the two filter tubes need to be in one-to-one correspondence.
In the pulse back-blowing ash-cleaning device, 1 pulse back-blowing valve is arranged on each group of back-blowing pipelines 7.
In the pulse back-blowing ash removal device, the height of the cone flow divider 32 is 1/5-3/5 from the throat of the ejector 6 to the height of the filter tube plate 3.
In a word, when the pulse back-blowing ash removal device works normally, dust-containing gas enters the dust-containing gas chamber from the gas inlet of the filtering device, the dust-containing gas is filtered through the porous channel of the filtering pipe, dust particles in the gas flow are intercepted on the outer surface of the filtering pipe and form a powder cake layer, and the filtered clean gas enters the clean gas chamber and is discharged through the gas outlet. Along with the continuous process of filtration, the cake layer on the outer surface of the filter tube is gradually thickened, so that the pressure drop inside the filter tube is increased, and therefore ash removal treatment needs to be carried out on the cake, and the performance of the filter tube is regenerated. When the pulse back-blowing device is used for deashing, the opening and closing time of the pulse back-blowing valve is short, and the pulse back-blowing valve belongs to a transient process. When the pulse back-flushing valve in a normally closed state is opened, high-pressure nitrogen or clean synthetic gas in the back-flushing gas storage tank instantly and sequentially enters a back-flushing pipeline and an ejector, under the ejection action of the ejector, a large amount of clean gas is introduced from a clean gas chamber and enters the gas ejector together, and is shunted by a cone shunt, the inner wall of the filter pipe is back-flushed, and the flour cake layer on the outer surface of the filter pipe is stripped by utilizing transient energy, so that the resistance of the filter pipe is basically recovered to the initial state, and the regeneration of the performance of the filter pipe is realized. According to the filter tube plate and the pulse back-blowing ash removal device with the filter tube plate, the back-blowing airflow is reasonably divided by adjusting the cone flow divider, so that the back-blowing gas is not only concentrated at the center of the floor, but the filter tubes at any positions are uniformly back-blown, the diffusion loss is reduced, the heat transfer efficiency of the ejector is improved, and the ash removal effect is improved. Meanwhile, the cone splitter divides the back-blowing gas, so that the back-blowing ash removal pressure of a single filter pipe can be reduced, the thermal shock and the vibration of the filter pipe are reduced, and the service life of the filter pipe is prolonged.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A filter tube sheet, comprising: 1 circular bottom plate and more than 4 cone flow dividers; wherein, more than four groups of injection units are arranged on the bottom plate; the total area occupied by each group of injection units is a circular area, 1 cone splitter is fixedly arranged at the center of each circular area, and 3 filter tube inlets are uniformly formed around each cone splitter.
2. The filter tube sheet of claim 1, wherein the cone splitter apex angle is between 30 ° and 80 °.
3. The filter tube sheet of claim 1, wherein in each circular region the 3 filter tube inlets are distributed in a regular triangle with the cone splitter base tangent to each of the 3 filter tube inlets.
4. A pulse blow-back ash removal device, wherein the ash removal device comprises the filter tube sheet of claim 1, 2 or 3, and the ash removal device further comprises: the filter comprises a filter tank, a gas inlet for introducing dust-containing gas, a filter pipe, a gas outlet for leading out filtered clean gas, an ejector, a back-blowing pipeline and a back-blowing gas storage tank; wherein,
the filter tank consists of a body and an ash bucket, the ash bucket is positioned at the lower end of the body, and the ash bucket is movably connected with the body; the body is of a cylindrical structure, and the ash bucket is of an inverted trapezoidal barrel-shaped structure;
the filter tube plate is arranged in the filter tank, and the outer diameter of the filter tube plate is equal to the inner diameter of the filter tank; the filter tube plate divides the filter tank body into an upper part and a lower part, wherein the upper part is a clean gas chamber, and the lower part is a dust-containing gas chamber; the upper part of the clean gas chamber is provided with a gas outlet, and the lower part of the dusty gas chamber is provided with a gas inlet;
more than four filter tube groups are arranged in the dust-containing gas chamber, and each filter tube group comprises 3 filter tubes; more than four filter tube groups correspond to more than four groups of injection units on the filter tube plate one by one; each filter tube group is arranged below the corresponding injection unit, one end of each filter tube group is fixed at the inlet of each filter tube group of the corresponding injection unit, and the other end of each filter tube group of the 3 filter tubes is suspended;
in the clean gas chamber, more than 4 cone flow splitters above the filter tube plate are respectively and correspondingly sleeved with 1 ejector;
the back-blowing gas storage tank is provided with more than 4 groups of back-blowing pipelines, and 1 group of back-blowing pipelines corresponds to 1 ejector; the outlet end of each group of back-blowing pipelines is provided with 1 nozzle which is arranged at the inlet of the corresponding ejector.
5. The pulse back-blowing ash-cleaning device of claim 4, wherein 1 pulse back-blowing valve is arranged on each group of back-blowing pipelines.
6. The pulse back-blowing ash removal device of claim 4, wherein the height of the cone splitter is 1/5-3/5 of the distance between the ejector throat and the filter tube plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710440589.0A CN107096334A (en) | 2017-06-06 | 2017-06-06 | One kind filtering tube sheet and pulse backblowing deashing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710440589.0A CN107096334A (en) | 2017-06-06 | 2017-06-06 | One kind filtering tube sheet and pulse backblowing deashing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107096334A true CN107096334A (en) | 2017-08-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710440589.0A Pending CN107096334A (en) | 2017-06-06 | 2017-06-06 | One kind filtering tube sheet and pulse backblowing deashing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107096334A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107970707A (en) * | 2017-10-26 | 2018-05-01 | 湖州兴远涂装设备有限公司 | A kind of pulse cleaner for being used for integrated lifting |
| CN109248506A (en) * | 2018-11-15 | 2019-01-22 | 中国石油大学(北京) | Manifold-type pulse backblowing ash-clearing structure and the filter for using the ash-clearing structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203874586U (en) * | 2014-05-21 | 2014-10-15 | 河南龙成煤高效技术应用有限公司 | High-speed blowback nozzle for dust collector |
| CN204522540U (en) * | 2015-01-30 | 2015-08-05 | 成都易态科技有限公司 | Gas-filtering device and blowback system thereof |
| CN105727648A (en) * | 2016-04-05 | 2016-07-06 | 河南理工大学 | Pulse back blowing dedusting device and gas ejector and filtering device thereof |
| CN208275151U (en) * | 2017-06-06 | 2018-12-25 | 河南理工大学 | A kind of filtering tube sheet and pulse backblowing deashing device |
-
2017
- 2017-06-06 CN CN201710440589.0A patent/CN107096334A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203874586U (en) * | 2014-05-21 | 2014-10-15 | 河南龙成煤高效技术应用有限公司 | High-speed blowback nozzle for dust collector |
| CN204522540U (en) * | 2015-01-30 | 2015-08-05 | 成都易态科技有限公司 | Gas-filtering device and blowback system thereof |
| CN105727648A (en) * | 2016-04-05 | 2016-07-06 | 河南理工大学 | Pulse back blowing dedusting device and gas ejector and filtering device thereof |
| CN208275151U (en) * | 2017-06-06 | 2018-12-25 | 河南理工大学 | A kind of filtering tube sheet and pulse backblowing deashing device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107970707A (en) * | 2017-10-26 | 2018-05-01 | 湖州兴远涂装设备有限公司 | A kind of pulse cleaner for being used for integrated lifting |
| CN109248506A (en) * | 2018-11-15 | 2019-01-22 | 中国石油大学(北京) | Manifold-type pulse backblowing ash-clearing structure and the filter for using the ash-clearing structure |
| CN109248506B (en) * | 2018-11-15 | 2024-01-30 | 中国石油大学(北京) | Manifold type pulse back-blowing ash removing structure and filter using ash removing structure |
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|---|---|---|---|
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20170829 |
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