CN107042041A - A kind of high-temperature dusty gas dust arrester of fast changeable filter disc - Google Patents
A kind of high-temperature dusty gas dust arrester of fast changeable filter disc Download PDFInfo
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- CN107042041A CN107042041A CN201710218594.7A CN201710218594A CN107042041A CN 107042041 A CN107042041 A CN 107042041A CN 201710218594 A CN201710218594 A CN 201710218594A CN 107042041 A CN107042041 A CN 107042041A
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- filter
- filtering
- top cover
- temperature
- metal shell
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Classifications
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- 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
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
-
- 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
- B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
- B01D46/0086—Filter condition indicators
-
- 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
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B01D46/14—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces arranged in a star shape
-
- 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
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The present invention provides a kind of high-temperature dusty gas dust arrester of fast changeable filter, it is main to be made up of metal shell, filtering plate rack, ceramic filter and top cover, the metal shell bottom sets unloading valve, bottom is connected with air inlet pipe, top is connected with top seal, the filtering plate rack is made up of seal base, filtering card and key, is fixed on inside metal shell.Filtering card is shape of photo holder frame structure, and edge is connected with each other, and bottom is welded in bottom plate, top inserts in top cover corresponding recesses just, the ceramic filter is intercalated in filtering card, and dust storage chamber and air-purifying chamber will be divided into inside metal shell, and the top cover sets exhaust outlet to be communicated with air-purifying chamber.Apparatus of the present invention are installed using potsherd draw and insert-type, with processing flue-gas temperature is high, filter is cheap and convenient, the corrugated structure design of replacing makes the advantages, the continuous high-efficient dedusting of many achievable high-temperature dusty gas used in parallel such as big, simple, the purification efficiency height of sealing of device filter area.
Description
Technical field
The invention belongs to removing for the high-temperature dust-containing flue gas of the dust separation of low-order coal pyrolysis oil gas and industrial furnace generation
What dirt purification techniques field, the high temperature dust pyrolysis oil gas produced available for low-order coal pyrolytic process, and industrial furnace were produced
The dust separation of high-temperature dust-containing flue gas.
Background technology
The higher oil gas composition of added value in low-order coal is extracted by pyrolytic technique, remaining semicoke be re-used as generating electricity or
Gasified raw material is greatly improved the utilization ratio of low-order coal, is the important technology path that Coal Clean is efficiently utilized.But it is due to
Low-order coal crushing strength is relatively low and heat endurance is poor, and granularity constantly diminishes in pyrolytic process, causes to be pyrolyzed generated pyrolysis
There is substantial amounts of dust in gas.It is the key technology that low-order coal high-efficiency cleaning is utilized that gas in pyrolysis gas, oil, dirt are carried out into separation
One of.When carrying out dedusting using traditional sack cleaner or electrostatic precipitator, gas temperature need to be generally reduced to 250 DEG C with
Under, the tar steam and dust in pyrolysis gas are easily reunited at this temperature, are attached on filtering material and pipeline, are caused
Block, cause total system can not long-time steady operation.So the low order coal pyrolysis gas of dust-laden need to carry out dry method at high temperature
Dedusting.
Ceramic filter membrane tube hot precipitator is hot precipitator most widely used at present, in integrated gasification combined cycle plants
And PFBC (PFBC) generates electricity etc. that good application has been obtained in system, but it is applied to low order pyrolysis of coal (IGCC)
But there are problems that during gas dedusting.Low order coal pyrolysis gas dustiness is big, and complicated component, and has coagulability, it is easy to which deposition makes
Filter opening is blocked, and is caused filtration resistance quickly to increase and is changed filter, it is necessary to continually shut down.Frequent shutdown causes low order pyrolysis of coal
The economy of technology is not high, and therefore, it is difficult to promote.At present using ceramic membrane filter tube or the gas cleaning at high temperature of metal filtration pipe
Although device can reach good filter efficiency, replacing membrane tube is cumbersome, not only causes the expense increase of consumptive material, and serious drop
The low operating efficiency of total system.
The content of the invention
It is frequent and numerous that the present invention changes filtering membrane tube for existing low-order coal pyrolytic technique high temperature dusty gas deduster
Trivial, causing the low problem of system overall operation efficiency, there is provided a kind of high-temperature dusty gas dedusting of fast changeable filter
Device, the filtration, purification available for low order coal pyrolysis gas.
In order to solve the above problems, concrete technical scheme of the invention is as follows：
A kind of high-temperature dusty gas dust arrester of fast changeable filter, including metal shell, filtering plate rack, pottery
Porcelain filter, deashing device and top cover；The metal shell bottom sets unloading valve, and bottom is connected with air inlet, top and top
Lid is tightly connected；The filtering plate rack is built-in and the top half of metal shell is fixed on by welding or by hook, and
And cradle top is intercalated in the corresponding groove of top cover just, soft elastic high temperature sealing material, cradle top and top are laid in groove
Cap-shaped is into being tightly connected；The ceramic filter is intercalated in filtering card, and metal shell inner space is divided into dust storage chamber
And air-purifying chamber, dust storage chamber communicated with air inlet pipe, and air-purifying chamber is communicated with escape pipe；The top cover sets exhaust outlet and air-purifying chamber phase
Logical, the inner side of top cover sets groove, and edge sets sealing ring, and periphery is tightly connected with metal shell.
Preferably, metal shell and the top cover inwall or outer wall post heat insulation layer, from light thermal insulation fire-resistant material
One or more of arbitrary proportions in material, aluminosilicate fiber cotton, rock wool, aluminium chlorate cellucotton, glass silk flosssilk wadding are mixed, and are prevented
Locking apparatus hull-skin temperature is too high, causes energy waste, coking or personnel to scald.
Preferably, the filtering plate rack is made up of filtering card, key and seal base, and filtering card is top edge
The photo frame type structure of insertion, ceramic filter is intercalated in filtering card, and polylith filtering card longitudinal edge is interconnected to form
Section is polygon, star or zigzag cylinder, and the cylinder lower weld is sealed on sealed bottom plate.
Preferably, the filtering card, key and seal base are prepared using heat resisting steel, in the filtering card of each plane
Portion can intercalation 1~n piece filters, the compressible high-temperature fibre braid of the interior use of groove, the high temperature resistant high score of intercalation filter
Sub- material, or inorganic sealed with polymer composite.
Preferably, the key cross sectional shape be rectangle, trapezoidal or parallelogram, wherein, up big and down small wedge structure
It is easily installed, while deashing is smooth, is capped and can be sealed after fastening bolt by encapsulant.
Preferably, the ceramic filter is porous ceramics piece or ceramic beaverboard, and size is with filtering the slotting pottery on card
Ceramics groove size matches, and is made from resistant to elevated temperatures ceramic material, composition is Al2O3、SiC、SiO2、Si3N4, silicic acid
Aluminium, mullite, cordierite, ZrO2In one or more be combined for main component.
Preferably, inserted slot and ceramic filter plate shape may be designed to up big and down small trapezoidal knot in the filtering card
Structure, not only make it that deashing is smooth, filter it is easier for installation, and top cover can be used to apply downward pressure so that
Sealing of the filter with filtering card is tighter.
Preferably, the deashing device be pulse backblowing deashing device, mechanical vibrator, one kind in ultrasonic deashing device or
Any combination of several devices, online ash removal is carried out according to the highest limit value of filtering pressure drop setting or timing to ceramic filter plate.
Preferably, when the deashing device is pulse backblowing deashing device, solderable height was slightly less than inside air-purifying chamber
Filter and blowback nozzle is installed in the metal partion (metp) of card, the space being each separated out, carry out pulse backblowing deashing, filtering card and dust
Welding metal silk screen is may be selected in the one side of room contact, and strengthening action is played to ceramic filter.
Preferably, the top cover inwall posts heat insulation layer, and cap edge sets refractory seals ring, with metal shell
It is connected and sealed using flange.Top cover inner surface sets to set in groove corresponding with filtering plate rack, groove and made pottery with intercalation
High-temperature flexible encapsulant is loaded in the corresponding small projection in ceramics position, groove, during installation, filter pedestal upper end is plugged in
In groove, give downward pressure by top cover and compression sealing is carried out to filtering plate rack and ceramic filter.Filtering plate rack,
Filter and top cover define air-purifying chamber together, and top cover upper end sets outlet pipe, communicated with air-purifying chamber.
In another aspect of the present invention, the invention provides a kind of foregoing fast changeable filter of utilization
The method that high-temperature dusty gas dust arrester carries out high-temperature dusty gas dedusting.Embodiments in accordance with the present invention, this method includes
Following steps：
A) two or many playscript with stage directions devices are installed in parallel, and during the work operation of one or more device, can be exceeded filtration resistance
The table apparatus for designing the upper limit is shut down and quick-replaceable filtering material；
B) filtering blast generation type one：The external air-introduced machine of blast pipe, constantly outwards pumping, in air-purifying chamber formation negative pressure,
High-temperature dusty gas enters dust storage chamber from air inlet pipe, enters air-purifying chamber by ceramic filter under pressure, and grit quilt
It is blocked on filter；Filter blast generation type two：By machine of being given a dinner for a visitor from afar at air inlet pipe, supply gas, entered by pressure to dust storage chamber
Row dedusting；Filter blast generation type three：Above-mentioned mode one and mode two are applied in combination；
C) with the progress of filtering, the filtration resistance of equipment constantly increases.Deashing pattern one：Filtration resistance is monitored in real time,
When resistance reaches the peak of setting, open deashing device and deashing is carried out to ceramic filter.Pattern two：Set a time
Section, timing carries out deashing；
D) when deashing processing effectively can not reduce filtration resistance, close before this TV station dust arrester, open standby to be opened
Device, it is ensured that high-temperature dust removal process is continuously run.Lugs top cover is opened, is integrally hung out on equipment, or by filtering core,
Then the filter after use is extracted, in new filter wound edgewise high temperature sealing material, and is inserted into plugboard trough, is covered
Upper top cover, top cover and casing seal dust arrester under fastening pressure by encapsulant.Complete the replacing of ceramic filter
Afterwards, the table apparatus enters state to be opened.
Compared with existing gas cleaning at high temperature purifier, advantage of the invention is that：
(1) installed using plug-in, replacing filter is more convenient, enormously simplify filter mounting process,
Improve the operational efficiency of system；
(2) using it is one or more groups of than relatively thin ceramic membrane filter piece as filter element, reduce filtration resistance, and subtract
Lack the risk of potsherd fracture, and potsherd can realize standardization large-scale industrial batch production, compared to ceramic membrane mistake
Chimney filter, the part for there was only tubulose using the price of the ceramic filter of identical filter area, greatly reduces filtering material
Production cost；
(3) cheap due to simple in construction, many institute's invention dedusters are used in parallel, and the company of whole system can be achieved
Continuous stable operation.
Brief description of the drawings
Fig. 1 is the structural representation of the high-temperature dusty gas dust arrester of fast changeable filter used in the embodiment of the present invention
Figure.
Fig. 2 is the knot of the high-temperature dusty gas dust arrester cross section of fast changeable filter used in the embodiment of the present invention
Structure schematic diagram.
Fig. 3 is the enlarged drawing of dotted box portion in Fig. 2.
Fig. 4 is the structural representation of top cover used in the embodiment of the present invention.
In accompanying drawing, 1- metal shells；2- fibrous insulating layers；3- seal bases；4- filters card；5- ceramic filters；6-
Fixed hook；7- clamp flanges；8- top covers；9- discharge ducts；10- purge gas pipelines；11- blowback control valves；12- high temperature resistants
Sealing gasket；13- refractory seals rings；14- admission lines；15- unloading valves；16- metal partion (metp)s；17- blowback nozzles；18- inserted sheets
Groove encapsulant；19- keies；8a- screwed holes；8b- cap recess；Respective protrusions in 8c- grooves；8d- exhaust outlets.
Embodiment
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated, but the present invention
Content is not limited solely to the following examples.
As Figure 1-3, in the present embodiment, the high-temperature dusty gas dust arrester of fast changeable filter of the present invention
Mainly include metal shell 1, heat insulation layer 2, seal base 3, filtering card 4, ceramic filter 5, fixed hook 6, fastening
Flange 7, top cover 8, discharge duct 9, purge gas pipeline 10, blowback control valve 11, refractory seals pad 12, refractory seals ring
13rd, fibrous encapsulation ring 8, admission line 14, unloading valve 15, metal partion (metp) 16, blowback nozzle 17, inserted slot encapsulant 18 and wedge
Piece 19.
Metal shell 1 and the inwall of top cover 8 post the heat insulation layer that thickness is about 3cm, and material is aluminosilicate fiber cotton, use
Heat-resisting rivet is fixed on metal shell.Filtering card 4 edge, which is welded to each other, surrounds star cylinder, bottom welding and seal base
On 3, filtering plate rack is constituted.Filtering plate rack is fixed on metal shell inner space upper end by fixed hook 6, and top exceeds
1~15cm of case top edge.Filter cradle top is inserted in the groove of top cover 8, and refractory seals pad is filled with groove
12, prepared using high-temperature fibre.Top cover is connected with metal shell by clamp flange 7, and high-temperature fibre sealing is installed in centre
Ring 13 is sealed.
Seal base, filtering card and key are prepared from 1Cr18Ni9Ti heat resisting steel in the present embodiment, seal base
Thickness is about 5mm, and filtering card is shape of photo holder frame structure, as shown in Figures 2 and 3.The high temperature sealing material of filling inside inserted slot
18 be pyroceram fibre.The structure of key is the up big and down small wedge structure that section is convex, is given during installation by top cover
Downward pressure is given, filter is compressed sealing relative to filtering card.
Ceramic filter plate is SiC porous ceramic film filters in the present embodiment, and pore-size is 1~10 μm, and porosity is about
For 38%.Ceramic filter plate thickness is about 6mm, and superficial film thickness is about 100 μm, is intercalated in filtering card.
Top cover is prepared from 1Cr18Ni9Ti heat resisting steel in the present embodiment, and its structural representation is as shown in figure 4, table in top cover
Face sets in groove corresponding with filtering plate rack, groove and loads high-temperature flexible encapsulant, during installation, on filtering plate rack
End is plugged in groove, and giving downward pressure by top cover carries out compression sealing.Filter plate rack, filter and top cover together
Air-purifying chamber is defined, top cover upper end sets outlet pipe, communicated with air-purifying chamber.
In the present embodiment using pulse backblowing deashing device to ceramic membrane filter piece carry out deashing, purge gas pipeline 10 from
Enter air-purifying chamber in discharge duct 9, as shown in figure 1, welding metal dividing plate 16 on seal base, 6 small skies are divided into by air-purifying chamber
Between, blowback nozzle 17 is installed in each interior volume, reverse gas cleaning is carried out to filter.
When carrying out dust separation to low rank coal high temperature pyrolysis oil gas using the present apparatus, it is installed in parallel using two table apparatus, its
In a table apparatus work, a table apparatus waits to open, and specific purification technique is：
(1) low order coal pyrolysis gas enters dust storage chamber A from air inlet pipe 14；(2) the external high-power air-introduced machine of blast pipe 9, constantly
Outwards pumping, negative pressure is formed in air-purifying chamber, and high temperature pyrolysis gas enters air-purifying chamber B by ceramic filter plate 5 under pressure, with
Discharged afterwards from discharge duct, and grit is blocked on filter surface；(3) with the progress of filtering, the grey cake layer of formation makes
Obtain filtration resistance constantly to increase, filtration resistance is monitored in real time, when resistance reaches setting value, open blowback control valve, blowback air
Body is sprayed at a high speed out of blowback nozzle, and deashing is carried out to ceramic filter；(4) when deashing processing can not effectively reduce filtration resistance
When, this TV station dust arrester is closed, opening device is treated while opening, residual gas is discharged, this table apparatus top cover is opened, key is extracted,
In new filter wound edgewise high-temperature fibre rope, and it is inserted into plugboard trough, inserts key, carries out compression sealing, cover
Top cover carries out top and compresses sealing, completes the replacing of ceramic filter, and the table apparatus enters state to be opened.
As known by the technical knowledge, the present invention can be by the embodiment party of other essence or essential feature without departing from its spirit
Case is realized.Therefore, embodiment disclosed above, is merely illustrative, and is not only.It is all within the scope of the present invention
Or be included in the invention in the change being equal in the scope of the present invention.
Claims (9)
1. a kind of high-temperature dusty gas dust arrester of fast changeable filter, it is characterised in that：Including metal shell, filtering
Plate rack, ceramic filter, deashing device and top cover；The metal shell bottom sets unloading valve, and bottom is connected with air inlet,
Top is connected with top seal；The filtering plate rack is built-in and the upper half of metal shell is fixed on by welding or by hook
Part, and cradle top is intercalated in the corresponding groove of top cover just, and soft elastic high temperature sealing material, top of support are laid in groove
Portion is tightly connected with top cover formation；The ceramic filter is intercalated in filtering card, and metal shell inner space is divided into
Dust storage chamber and air-purifying chamber, dust storage chamber are communicated with air inlet pipe, and air-purifying chamber is communicated with escape pipe；The top cover sets exhaust outlet and net gas
Room is communicated, and the inner side of top cover sets groove, and edge sets sealing ring, and periphery is tightly connected with metal shell.
2. the high-temperature dusty gas dust arrester of fast changeable filter as claimed in claim 1, it is characterised in that：Filtering
Plate rack is made up of seal base, filtering card and key, and filtering card is the photo frame type structure of top edge insertion, ceramic mistake
Filter disc is intercalated in filtering card, and it is regular or irregular polygon that polylith filtering card longitudinal edge, which is interconnected to form section,
Shape, star or zigzag cylinder, the cylinder lower weld on seal base in being sealed.
3. plate rack is filtered as claimed in claim 2, it is characterised in that：Seal base, filtering card and key are using heat-resisting
Steel is standby, inside the filtering card of each plane can intercalation 1~n piece filters, using compressible in the groove of intercalation filter
High-temperature-resistant inorganic fibre braid, high temperature modification high polymer material or inorfil and polymer composite are sealed.
4. filter plate rack as described in claim 2 and 3, it is characterised in that：Key cross sectional shape is rectangle, trapezoidal or parallel four
Side shape, wherein, up big and down small wedge structure is easily installed, while deashing is smooth, is capped and can be passed through sealing material after fastening bolt
Material is sealed.
5. the high-temperature dusty gas dust arrester of fast changeable filter as claimed in claim 1, it is characterised in that：The pottery
Porcelain filter is porous ceramics piece or ceramic beaverboard, and size matches with the slotting potsherd groove size on filtering card,
It is made from resistant to elevated temperatures ceramic material, composition is Al2O3、SiC、SiO2、Si3N4, alumina silicate, mullite, cordierite, ZrO2In
One or more be combined for main component.
6. the high-temperature dusty gas dust arrester of fast changeable filter as claimed in claim 1, it is characterised in that：It is described clear
Apparatus for ash is any combination of pulse backblowing deashing device, mechanical vibrator, one or more of devices in ultrasonic deashing device, according to
Filtering deashing is carried out to ceramic filter (plate) according to the highest limit value or timing of filtering pressure drop setting.
7. the high-temperature dusty gas dust arrester of fast changeable filter as claimed in claim 1, it is characterised in that：The top
Lid and metal shell inwall or outer wall set heat insulation layer, or coating heat insulation coating, and edge seal circle is refractory seals ring,
Material is high-temperature-resistant inorganic fibre braid, high temperature modification high polymer material or inorfil and high molecular composite, with gold
Category housing is connected and sealed using bolt fastening.
8. top cover as claimed in claim 7, is further characterized in that：The size for the groove that inside of top cover is set and position and filter
Support is corresponding, is set in groove and the projection corresponding with ceramic filter is set in high-temperature flexible encapsulant, groove, installed
When to filtering plate rack and ceramic filter carry out compression sealing.
9. the high-temperature dusty gas dust arrester of fast changeable filter as claimed in claim 1, it is characterised in that its high temperature
Dust collecting process comprises the following steps：
A) two or many playscript with stage directions devices are installed in parallel, when one or more work is run, and filtration resistance can be exceeded to the design upper limit
A table apparatus shut down and quick-replaceable filtering material；
B) filtering blast generation type one：The external air-introduced machine of blast pipe, constantly outwards pumping, in air-purifying chamber formation negative pressure, high temperature
Dusty gas enters dust storage chamber from air inlet pipe, enters air-purifying chamber by ceramic filter under pressure, and grit is blocked
On filter；Filter blast generation type two：By machine of being given a dinner for a visitor from afar at air inlet pipe, supply gas, removed by pressure to dust storage chamber
Dirt；Filter blast generation type three：Above-mentioned mode one and mode two are applied in combination.
C) with the progress of filtering, the filtration resistance of equipment constantly increases.Deashing pattern one：Monitoring filtration resistance, works as resistance in real time
When power reaches the peak of setting, open deashing device and deashing is carried out to ceramic filter.Pattern two：Preset a time
Section, timing carries out deashing；
D) when deashing processing effectively can not reduce filtration resistance, close before this TV station dust arrester, open standby device to be opened,
Ensure that high-temperature dust removal process is continuously run.Lugs top cover is opened, is integrally hung out on equipment, or by filtering core, then
The filter after use is extracted, in new filter wound edgewise high temperature sealing material, and is inserted into plugboard trough, covers top
Lid, top cover and casing seal dust arrester under fastening pressure by encapsulant., should after the replacing for completing ceramic filter
Table apparatus enters state to be opened.
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|---|---|---|---|
| CN201710218594.7A CN107042041A (en) | 2017-04-05 | 2017-04-05 | A kind of high-temperature dusty gas dust arrester of fast changeable filter disc |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710218594.7A CN107042041A (en) | 2017-04-05 | 2017-04-05 | A kind of high-temperature dusty gas dust arrester of fast changeable filter disc |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107670428A (en) * | 2017-10-19 | 2018-02-09 | 苏州红恩新材料科技有限公司 | A kind of screen pipe suitable for high-temperature dust-containing flue gas |
| CN108913222A (en) * | 2018-09-14 | 2018-11-30 | 江西理工大学 | A kind of pulverized coal pyrolysis produces pyrolysis Flash Gas Compression Skid System and processing method during tar |
| CN116514227A (en) * | 2023-06-12 | 2023-08-01 | 李峰 | Modularized automatic purifying device |
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Application publication date: 20170815 |