CN112964077A - Low-nitrogen flue gas backflow secondary combustion equipment - Google Patents
Low-nitrogen flue gas backflow secondary combustion equipment Download PDFInfo
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- CN112964077A CN112964077A CN202110435540.2A CN202110435540A CN112964077A CN 112964077 A CN112964077 A CN 112964077A CN 202110435540 A CN202110435540 A CN 202110435540A CN 112964077 A CN112964077 A CN 112964077A
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- flue gas
- honeycomb
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to low-nitrogen flue gas backflow secondary combustion equipment, which belongs to the field of flue gas treatment, wherein a honeycomb-shaped cylinder body consisting of a plurality of honeycomb holes is sleeved in a body, a first closed space is formed around the honeycomb holes, the top of the honeycomb-shaped cylinder body is communicated with a smoke outlet of the body, a smoke inlet is formed in one side of the body, a plurality of burners are arranged at the smoke inlet, the burners are connected with an upper-end oil tank through an oil separator, and a reducing agent is filled in the oil tank and is connected with an oil pump; the smoke inlet and the smoke outlet are both communicated with a lime kiln flue. According to the invention, the flue gas at the smoke inlet is mixed with the reducing agent sprayed out of the combustor and is fully decomposed through the gaps in the body and the honeycomb holes of the honeycomb cylinder in sequence, so that the denitration is full, the decomposition efficiency is improved, the standard emission is achieved, and the automation program is improved.
Description
Technical Field
The invention belongs to the field of flue gas treatment, and particularly relates to low-nitrogen flue gas backflow secondary combustion equipment.
Background
The lime shaft kiln is an important component in the calcining production process of industrial calcium oxide and building lime. In the industrial production, because the structures of raw materials, fuels and a calcining kiln are more or less capable of generating polluted inorganic substances SO2, NO and NO2 and organic substances CO, H2S, CS2, OCS and CH4, the method pollutes the environment and simultaneously causes certain damage to human bodies, animals, plants and other substances, and one or more methods for inhibiting, degrading and eliminating the harmful organic substances and inorganic substances are selected, and the method is based on the technology, the secondary combustion equipment is arranged outside the lime kiln to decompose nitrogen oxides, SO that the gas reaches the standard and is discharged.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides low-nitrogen flue gas backflow secondary combustion equipment, a gap is reserved between a body and a honeycomb-shaped cylinder body sleeved inside the body, flue gas is mixed with substances sprayed out by a burner through the gap and honeycomb holes, decomposition operation is realized, and in order to realize the purpose, the invention provides the following technical scheme:
the low-nitrogen flue gas backflow secondary combustion equipment comprises a body, wherein the body is in a tank shape, a honeycomb-shaped cylinder body consisting of a plurality of honeycomb holes is sleeved in the body, a first closed space is formed around the honeycomb holes, the top of the honeycomb-shaped cylinder body is communicated with a smoke outlet of the body, a smoke inlet is formed in one side of the body, a plurality of burners are arranged at the smoke inlet, the burners are connected with an upper-end oil tank through an oil separator, and a reducing agent is filled in the oil tank and is connected with an oil pump; and the smoke inlet and the smoke outlet are communicated with a lime kiln flue.
Preferably, a second closed space of 16 cm is welded around the inner wall of the body, the inner part of the second closed space is of a hollow structure, the outer wall of the body is communicated with a water inlet pipe, a connecting pipe is arranged below the water inlet pipe, and the connecting pipe is respectively communicated with the outer wall of the body and the outer wall of the honeycomb-shaped cylinder body; the improved water dispenser is characterized in that the water inlet pipe is connected with the water pump, the water pump is connected with the softened water tank on one side through the water bucket, the second electromagnetic valve is arranged between the water bucket and the softened water tank, the outer side of the water bucket is connected with the liquid level transmitter, and the upper end of the softened water tank is provided with the pressure gauge.
Preferably, two steam pipes are arranged above the water inlet pipe, one ends of the two steam pipes are respectively communicated with the outer wall of the body and the outer wall of the honeycomb-shaped cylinder body, the other ends of the two steam pipes are simultaneously connected with pipelines around a feed port of the lime kiln, and a first pressure transmitter, a third electromagnetic valve and an air release valve are respectively arranged on the steam pipes from top to bottom; an exhaust pipe is arranged at the joint of the steam pipe and the third electromagnetic valve, and a safety air valve is arranged on the exhaust pipe.
Preferably, an oil level display is arranged on the oil tank and used for displaying the oil quantity of the oil tank.
Preferably, the oil pump is 2 and all is equipped with second pressure transmitter on it, the oil pump passes through the connecting pipe and connects the oil drum respectively, be equipped with the fourth solenoid valve between oil pump and the oil drum.
Preferably, a water level display is arranged on one side of the body.
Preferably, the smoke outlet and the top end of the body are respectively provided with a K-type thermocouple.
Preferably, a nitrogen oxide sensor is arranged on the inner side of the lime kiln flue.
Preferably, the bottom of body is equipped with the ash discharge mouth, and inner wall and outer wall one side are equipped with corresponding first drain, the second drain in position respectively, the ash discharge mouth bottom is equipped with the ash discharge valve.
Compared with the prior art, the invention has the following beneficial effects: according to the low-nitrogen flue gas backflow secondary combustion equipment, oil in an oil drum is injected into the oil tank by the oil pump to be mixed with urea and methanol in the oil tank, then the oil is supplied to the combustor, the combustor is sprayed to the smoke inlet, the reducing agent and the flue gas simultaneously enter the smoke inlet, pass through a gap between the body and the honeycomb-shaped cylinder from top to bottom, then enter honeycomb holes of the honeycomb-shaped cylinder from bottom to top to be mixed and decomposed, and are discharged to a chimney through the smoke outlet, so that the denitration is sufficient, the decomposition efficiency is improved, and the emission is up to the standard.
Drawings
For ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the internal structure of the main body according to the present invention;
FIG. 3 is a schematic view of the external structure of the main body of the present invention;
FIG. 4 is a reference view of the internal structure of the honeycomb can of the present invention;
FIG. 5 is a block diagram of the connection structure of the central controller according to the present invention;
FIG. 6 is an enlarged partial view of FIG. A of the present invention;
FIG. 7 is an enlarged partial view of FIG. B of the present invention;
FIG. 8 is an enlarged view of the section C of the present invention.
In the figure: 1-body, 2-honeycomb cylinder, 3-honeycomb holes, 4-first closed space, 5-reinforcing ribs, 6-smoke outlet, 7-smoke inlet, 8-burner, 9-oil tank, 10-oil pump, 11-lime kiln flue, 12-second closed space, 13-water inlet pipe, 14-connecting pipe, 15-water pump, 16-first electromagnetic valve, 17-water bucket, 18-softened water tank, 19-second electromagnetic valve, 20-liquid level transmitter, 21-pressure gauge, 22-steam pipe, 23-lime kiln feed inlet, 24-first pressure transmitter, 25-third electromagnetic valve, 26-air release valve, 27-air exhaust pipe, 28-safety air valve, 29-oil level display and 30-second pressure transmitter, 31-an oil drum, 32-a fourth electromagnetic valve, 33-a water level display, 34-a K-type thermocouple, 35-a nitrogen oxide sensor, 36-an ash discharge port, 37-a first sewage discharge port, 38-a second sewage discharge port, 39-an ash discharge valve and 40-a chimney.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-8, the low-nitrogen flue gas backflow secondary combustion device comprises a body 1, wherein the body 1 is in a tank shape, a honeycomb-shaped cylinder 2 composed of a plurality of honeycomb holes is sleeved inside the body 1, a first closed space 4 is formed around the honeycomb holes 3, a gap is left between the body 1 and the honeycomb-shaped cylinder 2 and is supported by a reinforcing rib 5, the top of the honeycomb-shaped cylinder 2 is communicated with a smoke outlet 6 of the body 1, a smoke inlet 7 is formed in one side of the body 1, a plurality of burners 8 are arranged at the smoke inlet 7, the burners 8 are connected with an upper end oil tank 9 through oil separators, the oil tank 9 is connected with an oil pump 10, a reducing agent composed of oil and proportioned methanol, urea or liquid ammonia is filled in the oil tank 9, and the oil and the methanol accelerate the combustion of the burners 8 to reach a certain high temperature and are rapidly decomposed with the urea or the liquid ammonia; the smoke inlet 7 and the smoke outlet 6 are both communicated with a lime kiln flue.
Further, a second closed space 12 of 16 cm is welded on the inner wall of the body 1 in a surrounding manner, the inner part of the second closed space is of a hollow structure, the outer wall of the body 1 is communicated with a water inlet pipe 13, a connecting pipe 14 is arranged below the water inlet pipe 13, and the connecting pipe 14 is respectively communicated with the outer wall of the body 1 and the outer wall of the honeycomb-shaped barrel 2; the water inlet pipe 13 is connected with a water pump 15, the water inlet pipe 13 is provided with a first electromagnetic valve 16, the water pump 15 is connected with a softened water tank 18 on one side through a water barrel 17, a second electromagnetic valve 19 is arranged between the water barrel 17 and the softened water tank 18, the outer side of the water barrel 17 is connected with a liquid level transmitter 20, the upper end of the softened water tank 18 is provided with a pressure gauge 21, water in the softened water tank 18 is transmitted into the water barrel 17 through a connecting pipe, the water in the water barrel 17 is pumped out by the water pump 15 and injected into the water inlet pipe 13 and flows into the second closed space 12 on the inner wall of the body 1 through the water inlet pipe 13, then the water in the water tank is guided to gaps around the honeycomb holes 3 through the connecting pipe 14, when the liquid level transmitter 20 on the water barrel 17 detects that the water level reaches a limit value, information is transmitted to a central controller, the central controller controls the second electromagnetic valve, the pressure gauge 21 is used for detecting the water pressure change in the softened water tank 18 so as to adjust in time.
Further, two steam pipes 22 are arranged above the water inlet pipe 13, one ends of the two steam pipes 22 are respectively communicated with the outer wall of the body 1 and the outer wall of the honeycomb-shaped cylinder 2, the other ends of the two steam pipes are simultaneously connected with pipelines around the lime kiln feed inlet 23, and a first pressure transmitter 24, a third electromagnetic valve 25 and an air release valve 26 are respectively arranged on the steam pipes 22 from top to bottom; an exhaust pipe 27 is arranged at the joint of the steam pipe 22 and the third electromagnetic valve 25, a safety air valve 28 is arranged on the exhaust pipe 27, when the first pressure transmitter 24 on the steam pipe 22 detects that the pressure value reaches 1 kilogram, the pressure signal is transmitted to the central controller, the central controller controls the third electromagnetic valve 25 to be closed, then the steam is discharged through the exhaust pipe 27, the safety air valve 28 senses the pressure change and then is automatically opened to discharge the steam, when the pressure value of the first pressure transmitter 24 does not reach one kilogram, the central controller controls the third electromagnetic valve 25 to be opened and discharges the steam in the steam pipe 22 to the lime kiln feed inlet 23 through the air release valve 26 and is connected with the surrounding pipeline, the surface temperature of the body 1 is reduced by injecting water into the body 1 and the honeycomb-shaped cylinder 2 to prevent explosion, and the steam pipe 22 is arranged to carry out secondary utilization on the steam for.
Further, a fuel level display 29 is provided on the fuel tank 9 for displaying the amount of fuel in the fuel tank 9.
Further, the oil pump 10 is 2 and all is equipped with second pressure transmitter 30 on it, and oil pump 10 passes through the connecting pipe and connects oil drum 31 respectively, is equipped with fourth solenoid valve 32 between oil pump 10 and the oil drum 31, sends pressure signal to central controller when second pressure transmitter 30 of one of them oil pump 10 can not detect the pressure value, and central controller controls fourth solenoid valve 32 of one of them oil pump 10 to close and stops the fuel feeding, replaces another oil pump 10 to supply oil to oil tank 9 simultaneously.
Further, a water level display 33 is arranged on one side of the body 1, when a sensor in the water level display 33 senses that the water level reaches a limit value, a water level signal is sent to the central controller, and the central controller controls the first electromagnetic valve 16 to close and stop the water pump 15 from injecting water into the body 1.
Further, exhaust port 6 and body 1 top are equipped with K type thermocouple 34 respectively, and the setting of K type thermocouple 34 is convenient for detect body 1 and the inside temperature of body 1 department of discharging fume.
Further, a nitrogen oxide sensor 35 is arranged on the inner side of the lime kiln flue 11 and used for monitoring the concentration content of nitrogen oxide in the flue gas in real time and comparing the flue gas before and after treatment.
Further, the bottom of body 1 is equipped with row ash mouth 36, inner wall and outer wall one side are equipped with the corresponding first drain 37 in position respectively, second drain 38, wherein inner wall bottom both ends inwards extend and form the cone-shaped mouth, the cone-shaped mouth is connected with row ash mouth 36 and is convenient for deposit the dust granule, row ash mouth 36 bottom is equipped with dust valve 39, the dust granule gets into row ash mouth 36 and discharges through row ash valve 39, draw out the dust granule through opening first drain 37 and second drain 38 when the inside dust of body 1 blocks up.
The working principle is as follows: flue gas enters through a lime kiln flue 11 and is mixed with a reducing agent sprayed from a combustor 8 at a smoke inlet 7, the flue gas passes through a gap in a body 1 from top to bottom, then enters a honeycomb hole 3 of a honeycomb cylinder 2 from bottom to top to be mixed and decomposed, is discharged to the lime kiln flue 11 through a smoke outlet 6, is discharged through a chimney 40 outside the lime kiln flue 11, in order to reduce the temperature in the body 1 and prevent explosion, a second closed space 12 of 16 cm is welded on the inner wall surrounding the body 1 for storing water, is connected with a water pump 15 through a water inlet pipe 13, guides the water in a water bucket 17 to the second closed space 12, meanwhile, a connecting pipe 14 on the outer wall of the body 1 guides the water in the second closed space 12 to gaps around the honeycomb hole 3 of the honeycomb cylinder 2, the water generates steam after being heated in the body 1 and is discharged to a peripheral pipeline of a lime kiln discharge port 23 through two steam pipes 22, is convenient for dust removal and realizes secondary utilization, and the decomposed dust particles are discharged through a dust discharge valve 39 at the bottom of the body 1. The invention has the advantages of full denitration, improvement of decomposition efficiency, standard discharge and secondary utilization, and avoids resource waste.
The denitration treatment technology adopted in the paper is controlled and operated by a central processing unit, the burner, the oil pump, the water pump, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the liquid level transmitter, the first pressure transmitter, the oil level display, the second pressure transmitter, the water level display, the K-type thermocouple and the nitrogen oxide sensor are electrically connected with the central processing unit, the liquid level transmitter, the first pressure transmitter, the second pressure transmitter and the water level display send pressure signals to the central processing unit, and the water level signals operate the starting and closing of the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve through the central processing unit to control the oil supply and water supply operations of the oil pump and the water pump.
The temperature, the pressure and the flow speed of the kiln are controlled by adopting an automatic program, the concentration of fuel and nitrogen oxide in the kiln is monitored, and the automatic program and the numerical accuracy are improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. Low nitrogen flue gas backward flow post combustion equipment, its characterized in that: the smoke-exhaust-gas-purifying device comprises a body, wherein a honeycomb-shaped cylinder body consisting of a plurality of honeycomb holes is sleeved in the body, a first closed space is formed around the honeycomb holes, the top of the honeycomb-shaped cylinder body is communicated with a smoke exhaust port of the body, a smoke inlet is formed in one side of the body, a plurality of burners are arranged at the smoke inlet, the burners are connected with an upper-end oil tank through an oil distributor, and a reducing agent is filled in the oil tank and is connected with an oil pump; and the smoke inlet and the smoke outlet are communicated with a lime kiln flue.
2. The low-nitrogen flue gas recirculation post combustion apparatus according to claim 1, wherein: the honeycomb-shaped cylinder body is characterized in that the body is in a pot shape, a second closed space of 16 cm is welded on the inner wall of the body in a surrounding mode, the inner portion of the second closed space is of a hollow structure, the outer wall of the body is communicated with a water inlet pipe, a connecting pipe is arranged below the water inlet pipe, and the connecting pipe is respectively communicated with the outer wall of the body and the outer wall of the honeycomb-; the improved water dispenser is characterized in that the water inlet pipe is connected with the water pump, the water pump is connected with the softened water tank on one side through the water bucket, the second electromagnetic valve is arranged between the water bucket and the softened water tank, the outer side of the water bucket is connected with the liquid level transmitter, and the upper end of the softened water tank is provided with the pressure gauge.
3. The low-nitrogen flue gas recirculation post combustion apparatus according to claim 2, wherein: two steam pipes are arranged above the water inlet pipe, one ends of the two steam pipes are respectively communicated with the outer wall of the body and the outer wall of the honeycomb-shaped cylinder body, the other ends of the two steam pipes are simultaneously connected with pipelines around a lime kiln feed inlet, and a first pressure transmitter, a third electromagnetic valve and an air release valve are respectively arranged on the steam pipes from top to bottom; an exhaust pipe is arranged at the joint of the steam pipe and the third electromagnetic valve, and a safety air valve is arranged on the exhaust pipe.
4. The low-nitrogen flue gas recirculation post combustion apparatus according to any one of claims 1 to 3, wherein: and an oil level display is arranged on the oil tank and used for displaying the oil quantity of the oil tank.
5. The low-nitrogen flue gas recirculation post combustion apparatus according to any one of claims 1 to 3, wherein: the oil pump is 2 and all is equipped with second pressure transmitter on it, the oil pump passes through the connecting pipe and connects the oil drum respectively, be equipped with the fourth solenoid valve between oil pump and the oil drum.
6. The low-nitrogen flue gas recirculation post combustion apparatus according to any one of claims 1 to 3, wherein: a water level display is arranged on one side of the body.
7. The low-nitrogen flue gas recirculation post combustion apparatus according to any one of claims 1 to 3, wherein: and the smoke outlet and the top end of the body are respectively provided with a K-type thermocouple.
8. The low-nitrogen flue gas recirculation post combustion apparatus according to any one of claims 1 to 3, wherein: and a nitrogen oxide sensor is arranged on the inner side of the lime kiln flue.
9. The low-nitrogen flue gas recirculation post combustion apparatus according to any one of claims 1 to 3, wherein: the bottom of the body is provided with an ash discharge port, one side of the inner wall and one side of the outer wall are respectively provided with a first discharge port and a second discharge port which correspond to each other in position, and the bottom of the ash discharge port is provided with an ash discharge valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110435540.2A CN112964077A (en) | 2021-04-22 | 2021-04-22 | Low-nitrogen flue gas backflow secondary combustion equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110435540.2A CN112964077A (en) | 2021-04-22 | 2021-04-22 | Low-nitrogen flue gas backflow secondary combustion equipment |
Publications (1)
| Publication Number | Publication Date |
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| CN112964077A true CN112964077A (en) | 2021-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110435540.2A Withdrawn CN112964077A (en) | 2021-04-22 | 2021-04-22 | Low-nitrogen flue gas backflow secondary combustion equipment |
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| CN (1) | CN112964077A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2232557Y (en) * | 1995-03-30 | 1996-08-07 | 无锡县洛社张镇环保设备厂 | Automatic fuel multipurpose boiler |
| CN2903787Y (en) * | 2005-12-08 | 2007-05-23 | 袁巨魁 | Honeycomb multi flue pipe gas heating stove |
| CN105823210A (en) * | 2016-04-26 | 2016-08-03 | 天津中海盛世新能源科技有限公司 | Smoke bending circulation type multi-water jacket energy saving heating furnace |
| CN108591986A (en) * | 2018-05-31 | 2018-09-28 | 张家港威孚热能股份有限公司 | A kind of steam generator |
| CN108905590A (en) * | 2018-08-13 | 2018-11-30 | 中国华能集团有限公司 | A kind of denitrating system and method for station boiler low NO collaboration high temperature spray ammonia |
| US20200363099A1 (en) * | 2017-12-29 | 2020-11-19 | Kyungdong Navien Co., Ltd. | Smoke tube boiler |
-
2021
- 2021-04-22 CN CN202110435540.2A patent/CN112964077A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2232557Y (en) * | 1995-03-30 | 1996-08-07 | 无锡县洛社张镇环保设备厂 | Automatic fuel multipurpose boiler |
| CN2903787Y (en) * | 2005-12-08 | 2007-05-23 | 袁巨魁 | Honeycomb multi flue pipe gas heating stove |
| CN105823210A (en) * | 2016-04-26 | 2016-08-03 | 天津中海盛世新能源科技有限公司 | Smoke bending circulation type multi-water jacket energy saving heating furnace |
| US20200363099A1 (en) * | 2017-12-29 | 2020-11-19 | Kyungdong Navien Co., Ltd. | Smoke tube boiler |
| CN108591986A (en) * | 2018-05-31 | 2018-09-28 | 张家港威孚热能股份有限公司 | A kind of steam generator |
| CN108905590A (en) * | 2018-08-13 | 2018-11-30 | 中国华能集团有限公司 | A kind of denitrating system and method for station boiler low NO collaboration high temperature spray ammonia |
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Application publication date: 20210615 |
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