CN109811099A - A kind of improved blast furnace divides coal bottle control device and control method - Google Patents
A kind of improved blast furnace divides coal bottle control device and control method Download PDFInfo
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- CN109811099A CN109811099A CN201910119896.8A CN201910119896A CN109811099A CN 109811099 A CN109811099 A CN 109811099A CN 201910119896 A CN201910119896 A CN 201910119896A CN 109811099 A CN109811099 A CN 109811099A
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- 239000003245 coal Substances 0.000 title claims abstract description 219
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007664 blowing Methods 0.000 claims abstract description 29
- 239000002817 coal dust Substances 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 230000000903 blocking effect Effects 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 28
- 238000010926 purge Methods 0.000 claims description 19
- 238000011010 flushing procedure Methods 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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Abstract
A kind of improved blast furnace of the present invention divides coal bottle control device, including divides coal bottle, coal jetting branch and coal rifle, and coal jetting branch connection divides coal bottle, coal rifle and coal jetting branch by connection by metal hose, and coal rifle is interior to install rifle gate valve, is equipped on coal jetting branch and gives coal valve；Its improvements are as follows: it further includes blowing block apparatus, blowdown apparatus and surveying to block up instrument；Blowing block apparatus includes blowing stifled branch pipe and blowing stifled valve, blows stifled branch pipe and connect with coal jetting branch, blows stifled valve and be installed on and blow on stifled branch pipe；Blowdown apparatus includes blow down branch, blowdown valve and filter bag, and blow down branch upper end is connect with coal jetting branch, and lower end is passed through in filter bag, and blowdown valve is installed on blow down branch；Stifled instrument is surveyed to be installed on coal jetting branch.Coal bottle control method is divided to include normal coal powder injection control, blow stifled control automatically and stop coal air blowing control；The present invention can avoid coal jetting branch, the blocking of coal rifle, realize uniformly and stably coal powder injection and " stop coal air-supply ", at the same install blowdown apparatus can online processing, collect coal dust, avoid pollution environment.
Description
Technical field
The present invention relates to a kind of improved blast furnaces to divide coal bottle control device and control method, belongs to furnace coal spraying technology neck
Domain.
Background technique
Blast furnace is sprayed into coal dust stable and uniform from coal rifle, is conducive to stablize blast furnace operating and blast furnace temperature control, while can
To improve the combustion rate of coal dust, high-coal ratio is mentioned, reduces coke ratio；Equably coal powder injection is one of target that every seat height furnace is pursued to coal rifle.
Existing blast furnace divides coal bottle control device as shown in Figure 1, including dividing coal bottle, coal jetting branch and coal rifle, coal jetting branch connection divides coal
By connection by metal hose, coal rifle is interior to install rifle gate valve for bottle, coal rifle and coal jetting branch, is equipped on coal jetting branch and gives coal valve；State
Interior majority enterprise's pulverized coal injection is blown using single series or bi serie, and every set, which divides on coal bottle, is equipped with more coal jetting branch, and more
Coal jetting branch coal rifle identical with quantity connects one to one；Coal dust divides in coal bottle in blast furnace to be evenly distributed, by coal jetting branch,
Coal rifle is sprayed onto Tuyere Raceway.Existing blast furnace divides coal bottle control device to suffer from the drawback that (1) due to height in actual production
Furnace coal powder injection belongs to gas-solid two conveyings, and coal jetting branch or coal rifle stopping state frequent occurrence in production cause coal dust uniform
To each air port of blast furnace, blast furnace pressure difference is unstable, is unfavorable for blast furnace operating for blowing；It (2), must not when blast furnace list branch coal rifle need to stop coal
Rifle gate valve is not closed, and " stopping coal air-supply " cannot achieve；Tuyere Raceway temperature closes rifle gate valve at 2000 DEG C or more for a long time,
Cause pipette tips to deform, will appear mill air port phenomenon when delivering coal again；(3) after coal jetting branch blocking, it is necessary to lay down at metal hose
Reason, operational hazards；And when dredging coal jetting branch, remaining coal dust can not be collected, environment is polluted；(4) it can not manually observe in time every
Whether whether branch coal rifle have coal or coal powder injection uniform, is unfavorable for the stabilization of blast furnace operating.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of improved blast furnaces to divide coal bottle control device and control method,
It can avoid coal jetting branch, the blocking of coal rifle, realize uniformly and stably coal powder injection；When blast furnace needs certain branch coal rifle to stop coal, it can be achieved that " stopping
Coal air-supply ", while install blowdown apparatus can online processing, collect coal dust, avoid pollution environment.
The technical solution for solving above-mentioned technical problem is:
A kind of improved blast furnace divides coal bottle control device, including divides coal bottle, coal jetting branch and coal rifle, and coal jetting branch connection divides coal
By connection by metal hose, coal rifle is interior to install rifle gate valve for bottle, coal rifle and coal jetting branch, is equipped on coal jetting branch and gives coal valve；Its
Improvements are as follows: it further includes blowing block apparatus, blowdown apparatus and surveying to block up instrument；The block apparatus that blows includes blowing stifled branch pipe and blowing stifled
Valve blows stifled branch pipe and connect with coal jetting branch, blows stifled valve and is installed on and blows on stifled branch pipe；The blowdown apparatus includes blow down branch, row
Dirty valve and filter bag, blow down branch upper end are connect with coal jetting branch, and lower end is passed through in filter bag, and blowdown valve is installed on blow down branch；
The stifled instrument of survey is installed on coal jetting branch.
A kind of above-mentioned improved blast furnace divides coal bottle control device, it further includes the triple valve being installed on coal jetting branch,
Triple valve includes preceding valve, rear valve and back-flushing valve, and rear valve and connection by metal hose, preceding valve are connect with coal jetting branch.
A kind of above-mentioned improved blast furnace divides coal bottle control device, and the coal jetting branch is from dividing coal bottle to coal rifle direction sequence
It installs to coal valve, blow stifled branch pipe, blow down branch, the stifled instrument of survey and triple valve, described blow is installed at coal jetting branch on stifled branch pipe
There is non-return valve.
A kind of above-mentioned improved blast furnace divides coal bottle control device, and the blowdown apparatus further includes blowdown supervisor and support
Frame, the lower end of blow down branch and blowdown supervisor connect, and blowdown supervisor lower end is fixedly connected with support frame, and filter bag is located at outside support frame
Portion surrounds support frame, and the oral area of filter bag is bound on blowdown supervisor.
A kind of improved blast furnace divides coal bottle control method, including normal coal powder injection control, blows stifled control automatically and stop coal air-supply
Control；The normal coal powder injection control method are as follows: open to coal valve, the preceding valve of triple valve, rear valve, rifle gate valve；Stifled valve, blowdown are blown in closing
Valve, back-flushing valve, coal dust, through coal jetting branch, are surveyed stifled instrument, triple valve, metal hose, coal rifle and are sprayed onto after dividing in coal bottle and evenly distributing
Normal coal powder injection is completed in In Raceway Before Tuyere of Blast Furnace；
It is described to blow blocking control method automatically are as follows: when surveying stifled instrument and showing coal jetting branch blocking, opening blows stifled valve, to blowing in stifled branch pipe
It is passed through the purging that high pressure nitrogen carries out coal jetting branch；If surveying stifled instrument still shows blocking, purged using backblowing, specifically
Are as follows: rifle gate valve is closed, to valve before coal valve, threeway, valve, blowdown valve, back-flushing valve after threeway is opened, elevated pressure nitrogen is passed through into back-flushing valve
Gas reverse blow coal jetting branch, coal dust and high pressure gas enter filter bag through blow down branch, blowdown supervisor, and gas is arranged by filter bag
Out, coal dust after coal jetting branch processing is unobstructed, is successively closed blowdown valve, back-flushing valve, is opened to coal valve, threeway then inside filter bag
Valve, preceding valve, rifle gate valve afterwards, coal dust is sent to In Raceway Before Tuyere of Blast Furnace；
It is described to stop coal air blowing control method are as follows: when blast furnace needs certain branch coal rifle to stop coal air-supply, first to open and blow stifled valve, block up branch to blowing
High pressure nitrogen is passed through in pipe, coal valve is given in closing, can be realized and stops coal air-supply.
A kind of above-mentioned improved blast furnace divides coal bottle control method, described to blow in blocking control method automatically, and when surveying, stifled instrument is aobvious
Show coal jetting branch blocking when, opening blow stifled valve, to blow be passed through in stifled branch pipe pressure be 0.8~1.2MPa high pressure nitrogen sprayed
The purging of coal branch pipe, purging duration are 3~6s, and 380~420s is divided between purging, and purge cycles are 3.0~4.0h, can be with
Promote coal jetting branch blows logical probability；If surveying stifled instrument still shows blocking, then is purged using backblowing；The backblowing is blown
During sweeping, the nitrogen pressure in back-flushing valve is 0.8~1.2MPa.
The invention has the benefit that
The present invention surveys stifled instrument by increasing, and the real-time monitoring of coal dust stopping state in coal jetting branch may be implemented, blown by adding
Block apparatus and blowdown apparatus, and nitrogen pressure and purge time, purge cycles, purging interval are rationally controlled, Ke Yishi
The thorough purging of coal dust, guarantees the unimpeded of coal dust branch pipe in existing coal jetting branch, realizes the normal coal powder injection of blast furnace, while to coal jetting branch
The middle coal dust purged out can real-time collecting into the filter bag of blowdown apparatus, when coal jetting branch of blast furnace blocking even " blocks ", pass through
Blowdown apparatus, triple valve can online processings, it is not necessary to lay down metal hose, safe operation avoids pollution environment；When certain branch rifle of needs
, it can be achieved that " stopping coal air-supply ", guarantees the stable smooth operation of blast furnace when stopping coal；Coal dust can be prevented by blowing the non-return valve installed in stifled branch pipe
It blows back into and blows in stifled branch pipe.
Detailed description of the invention
Fig. 1 is that existing blast furnace divides coal bottle control device schematic diagram；
Fig. 2 is that blast furnace of the present invention divides coal bottle control device schematic diagram；
In the figure, it is marked as divide coal bottle 1, to coal valve 2, coal jetting branch 3, metal hose 4, rifle gate valve 5, coal rifle 6, blow stifled valve 7, blow it is stifled
12, annulus item 13, support frame 14, filter bag 15, triple valve are responsible in branch pipe 8, non-return valve 9, blowdown valve 10, blow down branch 11, blowdown
16, rear valve 17, preceding valve 18, back-flushing valve 19, the stifled instrument 20 of survey.
Specific embodiment
Fig. 2 shows that a kind of improved blast furnace of the present invention divides coal bottle control device, including divides coal bottle 1, coal jetting branch 3, coal rifle
6, it blows block apparatus, blowdown apparatus and surveys stifled instrument 20；Divide on coal bottle 1 and be connected with 16 coal jetting branch 3, pacifies on every coal jetting branch 3
Equipped with instrument 20 and triple valve 16 is blocked up to coal valve 2, coal rifle 6, survey, triple valve 16 includes preceding valve 18, rear valve 17 and back-flushing valve 19, rear valve
17 connect with coal jetting branch 3, and preceding valve 18 is connect with metal hose 4, and coal rifle 6 is connect with metal hose 4, and rifle door is installed in coal rifle 6
Valve 5；Blowing block apparatus includes 16 sets, and block apparatus is blown in 1 set of installation on every coal jetting branch 3；Blowing block apparatus includes blowing stifled branch pipe 8, peace
Stifled valve 7 and non-return valve 9 are blown on stifled branch pipe loaded on blowing, the lower end for blowing stifled branch pipe 8 is connect with coal jetting branch 3, and non-return valve 9 is close to spray
Coal branch pipe 3 can prevent the coal dust backwash in coal jetting branch 3 from entering to blow in stifled branch pipe 8；Blowdown apparatus includes 16 sets, every coal powder injection
1 set of blowdown apparatus is installed on branch pipe 3；Blowdown apparatus includes blow down branch 11, the blowdown valve being installed on blow down branch 11 10, filter
Bag 15, blowdown supervisor 12 and support frame 14, the upper end of blow down branch 11 are connect with coal jetting branch 3, and lower end and blowdown supervisor 12 connect
It connecing, the lower end of blowdown supervisor 12 is fixedly connected with support frame 14, and the outside that filter bag 15 is located at support frame 13 surrounds support frame 13,
The oral area of filter bag 15 is bound on blowdown supervisor 12 by annulus item 13；
Fig. 2 shows that a kind of improved blast furnace of the present invention divides coal bottle control device whole after the assembly is completed, on every coal jetting branch 3
From dividing coal bottle 1 to install to 6 direction of coal rifle sequence to coal valve 2, blowing stifled branch pipe 8, blow down branch 11, the stifled instrument 20 of survey and triple valve 16；
In the present embodiment, for support frame 14 by 12 carbon steel Q235 galvanized wires around being made, galvanized wire diameter is 195mm, support
The lower part of frame 14 is web form, open topped；Filter bag 15 is anti-electrostatic polyester wear-resistant material, and lower seal is mounted on filter bag
Outside support frame 14, top annulus item 13 is banded on blowdown supervisor 12.
A kind of improved blast furnace of the present invention divides coal bottle control method, including normal coal powder injection control, automatic blow to block up control and stop
Coal air blowing control；Normal coal powder injection control method are as follows: open to coal valve 2, the preceding valve 18 of triple valve, rear valve 17, rifle gate valve 5；Closing is blown
Stifled valve 7, blowdown valve 10, back-flushing valve 19, coal dust through coal jetting branch 3, survey stifled instrument 10, triple valve after dividing in coal bottle 1 and evenly distributing
16, metal hose 4, coal rifle 6 are sprayed onto In Raceway Before Tuyere of Blast Furnace, complete normal coal powder injection；
Automatically blocking control method is blown are as follows: when surveying stifled instrument 20 and showing that coal jetting branch 3 blocks, opening blows stifled valve 7, to blowing stifled branch pipe 8
In be passed through the purging that the high pressure nitrogen that pressure is 0.8~1.2MPa carries out coal jetting branch 3, the purging duration is 5s, between purging
It is divided into 400s, purge cycles 3.6h, promote coal jetting branch 3 blows logical probability；If surveying stifled instrument 20 still shows blocking, use
Backblowing is purged, specifically: close rifle gate valve 5, to coal valve 2, valve 18 before threeway, open valve 17 after threeway, blowdown valve 10,
Back-flushing valve 19, be passed through into back-flushing valve 19 pressure be 0.8~1.2MPa high pressure nitrogen reverse blow coal jetting branch 3, coal dust and
High pressure gas enters filter bag 15 through blow down branch 11, blowdown supervisor 12, and gas is discharged by filter bag 15, and coal dust is then in filter bag 15
Portion, manually drains into grinding machine, grinds recycling again；Coal jetting branch 3 handle it is unobstructed after, successively close blowdown valve 10, back-flushing valve 19,
It opens to valve 17, preceding valve 18, rifle gate valve 5 after coal valve 2, threeway, coal dust is sent to In Raceway Before Tuyere of Blast Furnace；
Stop coal air blowing control method are as follows: when blast furnace needs certain branch coal rifle 6 to stop coal air-supply, first open and blow stifled valve 7, to blowing stifled branch pipe
It is passed through high pressure nitrogen in 8, closes to coal valve 2, can be realized and stop coal air-supply.
Claims (6)
1. a kind of improved blast furnace divides coal bottle control device, including divides coal bottle (1), coal jetting branch (3) and coal rifle (6), pci extension
Pipe (3) connection divides coal bottle (1), and coal rifle (6) and coal jetting branch (3) are connected by metal hose (4), and rifle door is installed in coal rifle (6)
Valve (5) is equipped on coal jetting branch (3) and gives coal valve (2)；It is characterized by: it further includes blowing block apparatus, blowdown apparatus and surveying stifled
Instrument (20)；The block apparatus that blows includes blowing stifled branch pipe (8) and blowing stifled valve (7), blows stifled branch pipe (8) and connect with coal jetting branch (3), blows
Stifled valve (7), which are installed on, blows on stifled branch pipe (8)；The blowdown apparatus includes blow down branch (11), blowdown valve (10) and filter bag (15),
Blow down branch (11) upper end is connect with coal jetting branch (3), and lower end is passed through in filter bag (15), and blowdown valve (10) is installed on blow down branch
(11) on；The survey stifled instrument (20) is installed on coal jetting branch (3).
2. a kind of improved blast furnace as described in claim 1 divides coal bottle control device, it is characterised in that: it further includes being installed on
Triple valve (16) on coal jetting branch (3), triple valve (16) include preceding valve (18), rear valve (17) and back-flushing valve (19), rear valve
(17) it is connect with coal jetting branch (3), preceding valve (18) connect with metal hose (4).
3. a kind of improved blast furnace as claimed in claim 1 or 2 divides coal bottle control device, it is characterised in that: the pci extension
Pipe (3) from divide coal bottle (1) to the sequence installation of coal rifle (6) direction to coal valve (2), blow stifled branch pipe (8), blow down branch (11), survey it is stifled
Instrument (20) and triple valve (16), described blow are equipped with non-return valve (9) at coal jetting branch (3) on stifled branch pipe (8).
4. a kind of improved blast furnace as described in claim 1 divides coal bottle control device, it is characterised in that: the blowdown apparatus is also
Including blowdown supervisor (12) and support frame (14), the lower end of blow down branch (11) is connect with blowdown supervisor (12), blowdown supervisor
(12) lower end is fixedly connected with support frame (14), and the outside that filter bag (15) is located at support frame (14) surrounds support frame (14), filter
The oral area of bag (15) is bound on blowdown supervisor (12).
5. a kind of improved blast furnace divides coal bottle control method, it is characterised in that: including normal coal powder injection control, automatically blow stifled control and
Stop coal air blowing control；The normal coal powder injection control method are as follows: open to coal valve (2), the preceding valve of triple valve (18), rear valve (17), rifle
Gate valve (5)；Stifled valve (7), blowdown valve (10), back-flushing valve (19) are blown in closing, and coal dust is after dividing in coal bottle (1) and evenly distributing, through spraying
Coal branch pipe (3), survey stifled instrument (20), triple valve (16), metal hose (4) and coal rifle (6) are sprayed onto In Raceway Before Tuyere of Blast Furnace, complete just
Normal coal powder injection；
It is described to blow blocking control method automatically are as follows: when surveying stifled instrument (20) display coal jetting branch (3) blocking, opening blows stifled valve (7), to
It blows and is passed through the purging that high pressure nitrogen carries out coal jetting branch (3) in stifled branch pipe (3)；If surveying stifled instrument (20) still shows blocking, adopt
It is purged with backblowing, specifically: it closes rifle gate valve (5), gives the preceding valve (18) of coal valve (2) and triple valve (16), open three
Rear valve (17), blowdown valve (10) and the back-flushing valve (19) of port valve (16), are passed through high pressure nitrogen reverse blow in back-flushing valve (19)
Coal jetting branch (3), coal dust and high pressure gas enter filter bag (15) through blow down branch (11), blowdown supervisor (12), and gas passes through filter
Bag (15) discharge, coal dust is then in the inside of filter bag (15)；After coal jetting branch (3) processing is unobstructed, successively close blowdown valve (10), anti-
It blows valve (19), opens to coal valve (2), the rear valve (17) of triple valve (16), preceding valve (18) and rifle gate valve (5), coal dust is sent supreme
Furnace Tuyere Raceway；
It is described to stop coal air blowing control method are as follows: when blast furnace needs certain branch coal rifle (6) to stop coal air-supply, first opens and blow stifled valve (7), to
It blows and is passed through high pressure nitrogen in stifled branch pipe (8), coal valve (2) are given in closing, can be realized and stop coal air-supply.
6. a kind of improved blast furnace as claimed in claim 5 divides coal bottle control method, it is characterised in that: described to blow stifled control automatically
In method processed, when surveying stifled instrument (20) display coal jetting branch (3) blocking, opening blows stifled valve (7), is passed through to blowing in stifled branch pipe (8)
Pressure is that the high pressure nitrogen of 0.8~1.2MPa carries out the purging of coal jetting branch (3), and the purging duration is 3~6s, purging interval
For 380~420s, purge cycles are 3.0~4.0h, and can promote coal jetting branch (3) blows logical probability；If surveying stifled instrument (20) still
So display blocking, then purged using backblowing；In the backblowing purge, the nitrogen pressure in back-flushing valve (19) is
0.8~1.2MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910119896.8A CN109811099A (en) | 2019-02-18 | 2019-02-18 | A kind of improved blast furnace divides coal bottle control device and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910119896.8A CN109811099A (en) | 2019-02-18 | 2019-02-18 | A kind of improved blast furnace divides coal bottle control device and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109811099A true CN109811099A (en) | 2019-05-28 |
Family
ID=66606795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910119896.8A Withdrawn CN109811099A (en) | 2019-02-18 | 2019-02-18 | A kind of improved blast furnace divides coal bottle control device and control method |
Country Status (1)
| Country | Link |
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| CN (1) | CN109811099A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114790500A (en) * | 2022-04-08 | 2022-07-26 | 青岛恒拓环保科技有限公司 | Blast furnace coal injection anti-blocking intelligent back-blowing device and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112586A (en) * | 2015-07-31 | 2015-12-02 | 武汉钢铁(集团)公司 | Coal injection device of blast furnace |
| CN209957819U (en) * | 2019-02-18 | 2020-01-17 | 邯郸钢铁集团有限责任公司 | Improved control device for coal distributing bottle of blast furnace |
-
2019
- 2019-02-18 CN CN201910119896.8A patent/CN109811099A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112586A (en) * | 2015-07-31 | 2015-12-02 | 武汉钢铁(集团)公司 | Coal injection device of blast furnace |
| CN209957819U (en) * | 2019-02-18 | 2020-01-17 | 邯郸钢铁集团有限责任公司 | Improved control device for coal distributing bottle of blast furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114790500A (en) * | 2022-04-08 | 2022-07-26 | 青岛恒拓环保科技有限公司 | Blast furnace coal injection anti-blocking intelligent back-blowing device and method |
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Application publication date: 20190528 |