CN111617601B - Waste gas purification equipment for waste incinerator - Google Patents
Waste gas purification equipment for waste incinerator Download PDFInfo
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- CN111617601B CN111617601B CN202010509047.6A CN202010509047A CN111617601B CN 111617601 B CN111617601 B CN 111617601B CN 202010509047 A CN202010509047 A CN 202010509047A CN 111617601 B CN111617601 B CN 111617601B
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- sliding plate
- magnetic
- magnetic sliding
- purification box
- water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/808—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers driven from the bottom of the receptacle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
- B01F35/32—Driving arrangements
- B01F35/32005—Type of drive
- B01F35/32015—Flow driven
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/718—Feed mechanisms characterised by the means for feeding the components to the mixer using vacuum, under pressure in a closed receptacle or circuit system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/75—Discharge mechanisms
- B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
- B01F35/7543—Discharge mechanisms characterised by the means for discharging the components from the mixer using pneumatic pressure, overpressure or gas pressure in a closed receptacle or circuit system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
- B01D2258/0291—Flue gases from waste incineration plants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/25—Mixing waste with other ingredients
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses waste gas purification equipment for a garbage incinerator, which comprises a purification box fixedly connected to the upper end of a water pipe, wherein the left side wall of the purification box is connected with an air inlet pipe, the right side wall of the purification box is connected with an exhaust pipe, the inner wall of the purification box is symmetrically and fixedly connected with a first magnetic sliding plate and a second magnetic sliding plate through a telescopic spring, the inner wall of the purification box is rotatably connected with a vertical rod, the lower end of the vertical rod penetrates through the lower end of the purification box and is fixedly connected with a plurality of water driving wheels, and the side wall of the vertical rod, which is positioned in the purification box, is symmetrically and fixedly connected with a permanent magnet plate. According to the invention, the two permanent magnet plates are driven by the water driving wheel to rotate ceaselessly, and then the first magnetic sliding plate and the second magnetic sliding plate are continuously close to and away from each other under the action of the elasticity of the telescopic spring and the repulsion force of the permanent magnet plates, so that the purification box continuously sucks waste gas to be in full contact with a purifying agent, harmful gas in the waste gas is absorbed, and the waste gas is prevented from being discharged into the air to cause serious atmospheric pollution.
Description
Technical Field
The invention relates to the technical field of garbage treatment, in particular to waste gas purification equipment for a garbage incinerator.
Background
The waste incineration is a process of subjecting waste to oxidation at a high temperature by appropriate thermal decomposition, combustion, melting, or other reaction to reduce the volume of the waste to form a residue or a molten solid substance.
Can produce a large amount of waste gases after msw incineration, consequently can often be along with purifying the stove and purify waste gas at msw incineration often, the waste gas that produces in the msw incineration stove at present gets into the postcombustion room more, it is complete to burn under the compulsory burning of combustor, reentrant spray dust collector, get rid of the dust in the waste gas, discharge into the atmosphere through the chimney afterwards, but when discharging after waste gas burning, can be along with some harmful gas in the waste gas and discharge out of the burning furnace, only can't carry out effectual purification to these harmful gas through the dust collector, and then make waste gas discharge to the air in, easily cause air circumstance's pollution, be unfavorable for the environmental protection.
Therefore, the waste gas purifying equipment for the garbage incinerator is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides waste gas purification equipment for a garbage incinerator.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a waste gas purification equipment for msw incineration furnace, includes fixed connection at the purifying box of water pipe upper end, purifying box left side lateral wall is connected with the intake pipe, purifying box right side lateral wall is connected with the blast pipe, the purifying box inner wall passes through the first magnetism slide of expanding spring symmetry fixedly connected with and second magnetism slide, it has the purifying agent to be located to fill between first magnetism slide and the second magnetism slide in the purifying box, the purifying box inner wall rotates and is connected with the montant, the montant lower extreme runs through a plurality of water wheels of purifying box lower extreme and fixedly connected with, the montant is located the lateral wall symmetry fixedly connected with permanent magnetism board of purifying box, permanent magnetism board and first magnetism slide and second magnetism slide repel each other, a plurality of micropores have been seted up to the permanent magnetism board lateral wall.
Preferably, the first magnetic slide plate and the second magnetic slide plate are respectively provided with a first check valve and a second check valve which only allow the exhaust gas to flow from left to right.
Preferably, the purifying box upper end has been seted up the arc chamber, arc intracavity wall has the magnetism sliding plug through reset spring fixed connection, the purifying box has seted up the cavity near the interior top of blast pipe, a plurality of apopores have been seted up to the bottom in the cavity, reset spring's one end is kept away from in the arc chamber is through one-way inlet tube and cavity inner wall connection, reset spring's one end is kept away from in the arc chamber is through one-way suction pipe and water piping inner wall connection.
The invention has the following beneficial effects:
1. the water flow drives the water driving wheel to rotate, so that the water driving wheel rotates to purify waste gas, other power mechanisms are not needed, and the device is arranged together with a cooling water circulating water pipe on the incinerator, so that the device is simple and convenient and has strong practicability;
2. by arranging the water driving wheel, the permanent magnetic plates, the first magnetic sliding plate and the second magnetic sliding plate, when the water driving wheel drives the two permanent magnetic plates to rotate to be vertical to the first magnetic sliding plate and the second magnetic sliding plate, the first magnetic sliding plate and the second magnetic sliding plate are mutually far away under the action of magnetic repulsion force, so that negative pressure is formed in the purifying box, the purifying box inhales air through the first one-way valve, when the two permanent magnetic plates rotate to be respectively parallel to the first magnetic sliding plate and the second magnetic sliding plate, the first magnetic sliding plate and the second magnetic sliding plate are mutually close under the action of the expansion spring, so that positive pressure is formed in the purifying box, gas in the purifying box is discharged through the second one-way valve, meanwhile, in the rotating process of the permanent magnetic plates, the waste gas sucked into the purifying box is fully contacted with a purifying agent to absorb harmful gas in the waste gas, and the harmful gas in the waste gas is prevented from being discharged into the air, leading to serious air pollution;
3. through setting up the arc chamber, the smooth stopper of magnetism, one-way outlet pipe, cavity and apopore, the permanent magnetism board rotates and makes the permanent magnetism board incessantly sweep the smooth stopper of magnetism, and then the smooth stopper of magnetism makes a round trip to slide at the arc intracavity wall under the magnetic attraction of permanent magnetism board and reset spring's elastic force effect, and then the smooth stopper of magnetism can be with the continuous extrusion of water in the arc intracavity to the cavity, and spout from the apopore, spray from second check valve exhaust waste gas, carry out the dust fall for absorbent dust in the waste gas and handle, avoid the dust in the waste gas to discharge and cause secondary pollution in the air.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of the present invention;
fig. 3 is a schematic top view of an arc chamber according to a second embodiment of the present invention.
In the figure: the water purifier comprises a water pipe 1, a purification box 2, an air inlet pipe 3, an exhaust pipe 4, an expansion spring 5, a first magnetic sliding plate 6, a second magnetic sliding plate 7, a first one-way valve 8, a second one-way valve 9, a vertical rod 10, a water driving wheel 11, a permanent magnetic plate 12, micropores 13, an arc-shaped cavity 14, a reset spring 15, a magnetic sliding plug 16, a cavity 17, a water outlet hole 18, a one-way water inlet pipe 19 and a one-way water suction pipe 20.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example one
Referring to fig. 1, an exhaust gas purifying apparatus for a waste incinerator comprises a purifying box 2 fixedly connected to the upper end of a water pipe 1, and further, the water pipe 1 is a circulating water pipe of cooling water in the incinerator, so that the apparatus can be arranged together with the water pipe 1, which is simple and convenient, and has strong practicability, the left side wall of the purifying box 2 is connected with an air inlet pipe 3, the right side wall of the purifying box 2 is connected with an exhaust pipe 4, the inner wall of the purifying box 2 is symmetrically and fixedly connected with a first magnetic sliding plate 6 and a second magnetic sliding plate 7 through a telescopic spring 5, a purifying agent is filled between the first magnetic sliding plate 6 and the second magnetic sliding plate 7 in the purifying box 2, and further, the purifying agent can be activated carbon adsorbent, the inner wall of the purifying box 2 is rotatably connected with a vertical rod 10, the lower end of the vertical rod 10 penetrates through the lower end of the purifying box 2 and is fixedly connected with a plurality of water driving wheels 11, and further, the water driving wheels 11 are arranged in a wind cup shape, make the waste gas in the water pipe 1 can drive the water wheel 11 and rotate fast, the montant 10 is located the lateral wall symmetry fixedly connected with permanent magnetism board 12 of purifying box 2, and permanent magnetism board 12 repels with first magnetism slide 6 and second magnetism slide 7 mutually, and a plurality of micropores 13 have been seted up to permanent magnetism board 12 lateral wall, can filter the dust in the waste gas, increase gaseous cleanliness factor.
The first magnetic sliding plate 6 and the second magnetic sliding plate 7 are respectively provided with a first check valve 8 and a second check valve 9 which only allow waste gas to flow from left to right, further, when the two permanent magnetic plates 12 rotate periodically under two states of being perpendicular and parallel to the first magnetic sliding plate 6 and the second magnetic sliding plate 7, the first magnetic sliding plate 6 and the second magnetic sliding plate 7 are continuously away from and close to each other under the magnetic repulsion force of the permanent magnetic plates 12 and the elastic force of the extension spring 5, so that the waste gas in the gas inlet pipe 3 is continuously sucked into the purification box 2, and the purifying agent is stirred by the rotation of the permanent magnetic plates 12, so that the waste gas is fully contacted with the purifying agent, and the purification and removal of harmful gas in the waste gas are accelerated.
In this embodiment, when the cooling water continuously circulates in the water pipe 1, the flowing water drives the water impeller 11 to rotate, so that the water impeller 11 drives the two permanent magnetic plates 12 to rotate through the vertical rod 10, when the two permanent magnetic plates 12 rotate to be perpendicular to the first magnetic sliding plate 6 and the second magnetic sliding plate 7, the first magnetic sliding plate 6 and the second magnetic sliding plate 7 are away from each other under the magnetic repulsion force of the permanent magnetic plates 12, so that the inside of the purification box 2 is a negative pressure, so that the purification box 2 inhales air through the first check valve 8, and when the permanent magnetic plates 12 rotate, the purifying agent filled in the purification box 2 is stirred, so that the inhaled exhaust gas is sufficiently contacted with the purifying agent, when the two permanent magnetic plates 12 rotate to be parallel to the first magnetic sliding plate 6 and the second magnetic sliding plate 7 respectively, the first magnetic sliding plate 6 and the second magnetic sliding plate 7 approach each other under the elastic force of the expansion spring 5, so that the interior of the purification box 2 is positive pressure, and the purified gas in the purification box 2 is discharged through the second one-way valve 9, thereby completing the absorption and purification of harmful gas in the waste gas.
Example two
Referring to fig. 2-3, the difference from the first embodiment is that an arc-shaped cavity 14 is formed at the upper end of the purification box 2, a magnetic sliding plug 16 is fixedly connected to the inner wall of the arc-shaped cavity 14 through a return spring 15, further, a through hole is formed in the inner wall of the arc-shaped cavity 14 close to the return spring 15 to balance the air pressure of the magnetic sliding plug 16 when the inner wall of the arc-shaped cavity 14 slides, a cavity 17 is formed at the inner top of the purification box 2 close to the exhaust pipe 4, a plurality of water outlet holes 18 are formed in the inner bottom of the cavity 17, one end of the arc-shaped cavity 14 far away from the return spring 15 is connected to the inner wall of the cavity 17 through a one-way water inlet pipe 19, one end of the arc-shaped cavity 14 far away from the return spring 15 is connected to the inner wall of the water pipe 1 through a one-way water suction pipe 20, and it should be noted that the one-way water inlet pipe 19 only allows water to enter the arc-shaped cavity 17 from the water pipe 1.
In this embodiment, the permanent magnet plate 12 can drive the magnetic sliding plug 16 connected to the inner wall of the arc-shaped cavity 14 in a sealing sliding manner to slide when rotating, so that the space of the arc-shaped cavity 14 far from the return spring 15 is increased, and then the arc-shaped cavity 14 sucks water from the water pipe 1 through the one-way water suction pipe 20, when the permanent magnet plate 12 slides until the magnetic attraction between the magnetic sliding plug 16 and the permanent magnet plate 12 is not enough to overcome the elastic force of the return spring 15, at this time, the return spring 15 pushes the magnetic sliding plug 16 to slide, so that the water in the arc-shaped cavity 14 is squeezed into the cavity 17 through the one-way water inlet pipe 19 and is ejected from the water outlet hole 18, and further when the permanent magnet plate 12 rotates continuously, the magnetic sliding plug 16 slides back and forth on the inner wall of the arc-shaped cavity 14 under the action of the magnetic attraction of the permanent magnet plate 12 and the elastic force of the return spring 15, so as to continuously squeeze the water in the arc-shaped cavity 14 to be ejected from the water outlet hole 18, and to spray the waste gas discharged from the second one-way valve 9, dust falling treatment is carried out on the dust adsorbed in the waste gas, and secondary pollution caused by the fact that the dust in the waste gas is discharged into the air is avoided.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. The working method of the waste gas purification equipment for the garbage incinerator comprises a purification box (2) fixedly connected to the upper end of a water pipe (1), and is characterized in that an air inlet pipe (3) is connected to the side wall of the left side of the purification box (2), an exhaust pipe (4) is connected to the side wall of the right side of the purification box (2), a first magnetic sliding plate (6) and a second magnetic sliding plate (7) are symmetrically and fixedly connected to the inner wall of the purification box (2) through a telescopic spring (5), a purifying agent is filled between the first magnetic sliding plate (6) and the second magnetic sliding plate (7) in the purification box (2), a vertical rod (10) is rotatably connected to the inner wall of the purification box (2), the lower end of the vertical rod (10) penetrates through the lower end of the purification box (2) and is fixedly connected with a plurality of water driving wheels (11), and a permanent magnetic plate (12) is symmetrically and fixedly connected to the side wall of the vertical rod (10) in the purification box (2), the permanent magnet plate (12) is repellent to the first magnetic sliding plate (6) and the second magnetic sliding plate (7), and a plurality of micropores (13) are formed in the side wall of the permanent magnet plate (12);
a first check valve (8) and a second check valve (9) which only allow the waste gas to flow from left to right are respectively arranged on the first magnetic sliding plate (6) and the second magnetic sliding plate (7); when the two permanent magnet plates (12) rotate periodically in two states perpendicular and parallel to the first magnetic sliding plate (6) and the second magnetic sliding plate (7), the first magnetic sliding plate (6) and the second magnetic sliding plate (7) are continuously away from and close to each other under the action of the magnetic repulsion force of the permanent magnet plates (12) and the elastic force of the expansion springs (5), so that the waste gas in the gas inlet pipe (3) is continuously sucked into the purification box (2), and the purifying agent is stirred by the rotation of the permanent magnet plates (12), so that the waste gas is fully contacted with the purifying agent, and the purification and removal of harmful gas in the waste gas are accelerated;
an arc-shaped cavity (14) is formed in the upper end of the purification box (2), a magnetic sliding plug (16) is fixedly connected to the inner wall of the arc-shaped cavity (14) through a return spring (15), a cavity (17) is formed in the inner top, close to the exhaust pipe (4), of the purification box (2), a plurality of water outlet holes (18) are formed in the bottom of the cavity (17), one end, far away from the return spring (15), of the arc-shaped cavity (14) is connected with the inner wall of the cavity (17) through a one-way water inlet pipe (19), and one end, far away from the return spring (15), of the arc-shaped cavity (14) is connected with the inner wall of the water pipe (1) through a one-way water suction pipe (20);
the working method comprises the following steps: when cooling water continuously circulates in the water pipe (1), flowing water flow drives the water driving wheel (11) to rotate, so that the water driving wheel (11) drives the two permanent magnetic plates (12) to rotate through the vertical rod (10), when the two permanent magnetic plates (12) rotate to be perpendicular to the first magnetic sliding plate (6) and the second magnetic sliding plate (7), the first magnetic sliding plate (6) and the second magnetic sliding plate (7) are mutually far away under the action of magnetic repulsion force of the permanent magnetic plates (12), negative pressure is formed in the purifying box (2), the purifying box (2) inhales air through the first one-way valve (8), and when the permanent magnetic plates (12) rotate, purifying agents filled in the purifying box (2) are stirred, so that inhaled waste gas is fully contacted with the purifying agents, and when the two permanent magnetic plates (12) rotate to be respectively connected with the first magnetic sliding plate (6) and the second magnetic sliding plate (7), (respectively) 7) When the two magnetic sliding plates are parallel, the first magnetic sliding plate (6) and the second magnetic sliding plate (7) are close to each other under the elastic force of the telescopic spring (5), so that the interior of the purification box (2) is in positive pressure, and further purified gas in the purification box (2) is discharged through the second one-way valve (9), and harmful gas in waste gas is absorbed and purified;
the permanent magnet plate (12) can drive the magnetic sliding plug (16) which is connected with the inner wall of the arc-shaped cavity (14) in a sealing and sliding manner to slide when rotating, so that the space of the arc-shaped cavity (14) far away from the reset spring (15) is increased, the arc-shaped cavity (14) absorbs water from the water pipe (1) through the one-way water absorption pipe (20), when the permanent magnet plate (12) slides to the state that the magnetic attraction between the magnetic sliding plug (16) and the permanent magnet plate (12) is not enough to overcome the elasticity of the reset spring (15), the reset spring (15) pushes the magnetic sliding plug (16) to slide, so that the water in the arc-shaped cavity (14) is extruded into the cavity (17) through the one-way water inlet pipe (19) and is sprayed out of the water outlet hole (18), and further when the permanent magnet plate (12) rotates ceaselessly, magnetism sliding plug (16) make a round trip to slide at arc chamber (14) inner wall under the effect of the magnetic attraction of permanent magnetism board (12) and reset spring (15) elasticity, and then constantly extrudees the water in arc chamber (14) from apopore (18) blowout, sprays from second check valve (9) exhaust waste gas, carries out the dust fall for absorbent dust in the waste gas and handles, avoids the dust in the waste gas to discharge and cause secondary pollution in the air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010509047.6A CN111617601B (en) | 2020-06-07 | 2020-06-07 | Waste gas purification equipment for waste incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010509047.6A CN111617601B (en) | 2020-06-07 | 2020-06-07 | Waste gas purification equipment for waste incinerator |
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| CN111617601A CN111617601A (en) | 2020-09-04 |
| CN111617601B true CN111617601B (en) | 2021-12-07 |
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| CN202010509047.6A Active CN111617601B (en) | 2020-06-07 | 2020-06-07 | Waste gas purification equipment for waste incinerator |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112338995A (en) * | 2020-09-29 | 2021-02-09 | 张存田 | Cutting method of self-cleaning type paper towel for sanitary products |
| CN114797419A (en) * | 2022-02-17 | 2022-07-29 | 张璇 | Waste gas treatment environment-friendly device and use method |
| CN114939340B (en) * | 2022-05-05 | 2024-05-03 | 寿县绿色东方新能源有限责任公司 | Environment-friendly garbage incineration flue gas treatment device and application |
| CN116903073A (en) * | 2023-09-14 | 2023-10-20 | 广东思绿环保科技股份有限公司 | Multifunctional sewage purifying device |
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| EP3405280B1 (en) * | 2016-01-22 | 2019-06-05 | WashTec Holding GmbH | Device and method for producing a ready-to-use solution from a concentrate |
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| CN111617601A (en) | 2020-09-04 |
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