CN111072090A - Desulfurization wastewater evaporation tower capable of maintaining constant flow field and method - Google Patents
Desulfurization wastewater evaporation tower capable of maintaining constant flow field and method Download PDFInfo
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- CN111072090A CN111072090A CN201911364183.4A CN201911364183A CN111072090A CN 111072090 A CN111072090 A CN 111072090A CN 201911364183 A CN201911364183 A CN 201911364183A CN 111072090 A CN111072090 A CN 111072090A
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- flue gas
- evaporation tower
- waste water
- desulfurization waste
- flue
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- 238000001704 evaporation Methods 0.000 title claims abstract description 100
- 230000008020 evaporation Effects 0.000 title claims abstract description 98
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 71
- 230000023556 desulfurization Effects 0.000 title claims abstract description 71
- 239000002351 wastewater Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000003546 flue gas Substances 0.000 claims abstract description 88
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 230000003134 recirculating effect Effects 0.000 claims description 7
- 238000004065 wastewater treatment Methods 0.000 claims description 7
- 238000000889 atomisation Methods 0.000 claims description 6
- 239000007790 solid phase Substances 0.000 claims description 5
- 239000003344 environmental pollutant Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 231100000719 pollutant Toxicity 0.000 claims description 4
- 239000003595 mist Substances 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The invention relates to a desulfurization wastewater evaporation tower capable of keeping a constant flow field and a method, comprising the following steps: the evaporation tower body and the recycling flue gas pipe; and the recycling flue gas pipe is respectively connected with the outlet flue of the evaporation tower and the inlet flue of the evaporation tower, and a recycling flue gas regulating valve and a variable-frequency high-temperature fan are arranged on the recycling flue gas pipe. The invention has the beneficial effects that: the invention is provided with the recirculation flue gas pipe, and leads part of the flue gas at the outlet of the evaporation tower back to the volute type air chamber again, so that the total amount of the flue gas entering the evaporation tower is maintained, and the flow field in the tower can be kept constant under the condition of any flow of the desulfurization waste water, thereby avoiding the problems of wall sticking of liquid drops or poor evaporation and the like caused by the change of the flow of the desulfurization waste water; the invention is provided with the recycled flue gas regulating valve, the air quantity testing device, the hot flue gas regulating valve and the temperature measuring device, and the flue gas quantity at the inlet and the outlet of the evaporation tower and the recycled flue gas quantity can be quantitatively controlled, so that the system can accurately control the operation parameters and reduce the energy consumption.
Description
Technical Field
The invention relates to the technical field of desulfurization wastewater treatment, in particular to a desulfurization wastewater evaporation tower and a method capable of keeping a constant flow field.
Background
The thermal power generating set of China generally adopts the flue gas desulfurization technology of limestone-gypsum method to remove the sulfur dioxide pollution in the flue gas, however, when the system is in operation, various salinity, chloride ions, particulate matters and heavy metals can be continuously enriched in the desulfurization slurry, so that the water quality is deteriorated, and the desulfurization waste water needs to be discharged regularly. In addition, boiler circulating water, sewage, cooling water and chemical plant drainage in the power plant are usually gathered into the desulfurizing tower for centralized treatment, so that the desulfurization wastewater becomes the terminal point of the cascade utilization of the wastewater in the whole plant.
The traditional desulfurization wastewater treatment means is a 'triple-box' process, which comprises the steps of neutralization, precipitation, flocculation and the like, but can not remove chloride ions in water. The bypass flue evaporation treatment technology is characterized in that after a part of boiler economizers are led out, medium-temperature flue gas is used as a heat source, desulfurization waste water is evaporated in special equipment such as a rotary spray evaporation tower, the waste water is evaporated and gasified, and pollutants in the waste water are changed into solid fine particles and enter the flue gas. The smoke at the outlet of the rotary spray evaporation tower returns to the dust remover of the boiler again and is captured by the dust remover together with the fly ash. The method has the advantages of low investment cost, simple and reliable system, low requirement on initial water quality, low energy consumption and the like, and becomes a power plant desulfurization wastewater treatment technology with great development potential.
In the spray evaporation tower, a desulfurization waste water atomization device is generally arranged at the top, and is dried by hot flue gas. In order to avoid that the atomized desulfurization waste water is not sprayed to the inner wall surface and to ensure that liquid drops have proper residence time, a flow field in the spray drying tower needs to be carefully designed, and particularly, the rotational flow strength and the axial speed are reasonable and stable.
However, the output of the desulfurization waste water of the power plant is greatly changed due to the frequent fluctuation of the load of the boiler, so the treatment capacity of the desulfurization waste water evaporation tower is also not changed. Taking a typical 1000MW coal-fired unit in China as an example, when the limestone-gypsum method flue gas desulfurization technology is adopted for desulfurization, the wastewater yield is sometimes 3-5t/h, and sometimes 15-20 t/h. In actual operation, in order to avoid the reduction of the thermal efficiency of the boiler system caused by the extraction of too much hot flue gas, the temperature of the flue gas at the outlet of the desulfurization waste water evaporation tower is always controlled to be a constant value, such as about 150 ℃. Therefore, when the desulfurization waste water evaporation tower works under high load, the inlet hot flue gas flow is large; when the low-load work is carried out, the flow of hot flue gas is small. The flue gas flow of the desulfurization waste water evaporation tower can greatly influence the flow field in the tower, when the flow is large, the rotational flow strength and the axial speed are high, and vice versa. In this case, the large change of the flow field in the column is very disadvantageous in ensuring the normal evaporation of the desulfurization waste water and maintaining a reasonable droplet trajectory.
In view of the above, it is desirable to design a desulfurization waste water evaporation tower and a method capable of maintaining a constant flow field.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a desulfurization wastewater evaporation tower capable of keeping a constant flow field and a method for ensuring the evaporation of desulfurization wastewater by adopting the device.
The desulfurization waste water evaporation tower capable of keeping a constant flow field comprises an evaporation tower body and a recirculating flue gas pipe; the recycling flue gas pipe is respectively connected with the outlet flue of the evaporation tower and the inlet flue of the evaporation tower, and a recycling flue gas regulating valve and a variable-frequency high-temperature fan are arranged on the recycling flue gas pipe; a volute type air chamber and a desulfurization wastewater atomizer are arranged at the upper part of the evaporation tower body, and an annular flue gas flow channel is arranged at the lower part of the volute type air chamber; the inlet flue of the evaporation tower is connected with the inlet of the volute type air chamber; an air quantity testing device and a hot flue gas regulating valve are installed on an inlet flue of the evaporation tower, and a temperature measuring device is installed on an outlet flue of the evaporation tower.
Preferably, the method comprises the following steps: the ratio of the diameter to the height of the evaporation tower body is 0.5-0.9.
Preferably, the method comprises the following steps: the atomization angle of the desulfurization waste water atomizer is 60-120 degrees, and the atomization particle size is 50-200 mu m.
Preferably, the method comprises the following steps: the desulfurization waste water atomizer is connected with a desulfurization waste water pipeline.
The wastewater treatment method of the desulfurization wastewater evaporation tower capable of keeping a constant flow field comprises the following steps:
1) introducing desulfurization waste water into a desulfurization waste water atomizer, atomizing into liquid mist, introducing hot flue gas from a volute type air chamber, allowing the hot flue gas to enter an evaporation tower body after passing through an annular flue gas flow channel, evaporating the atomized desulfurization waste water, converting pollutants in the desulfurization waste water into a solid phase, allowing the solid phase to enter the flue gas, and allowing the solid phase to leave the evaporation tower;
2) a recirculating flue gas pipe connecting the outlet flue of the evaporation tower and the inlet flue of the evaporation tower leads a part of the outlet flue gas of the evaporation tower back to the volute type air chamber again;
3) adjusting the opening of a recirculated flue gas adjusting valve and the output of a variable-frequency high-temperature fan through an air quantity testing device of an inlet flue of the evaporation tower; adjusting a hot flue gas adjusting valve through a temperature measuring device of an outlet flue of the evaporation tower; so that the smoke quantity entering the evaporation tower is always kept constant.
Preferably, the method comprises the following steps: in the step 1), the flow velocity of the flue gas in the volute type air chamber is 3-8m/s, and the flow velocity of the flue gas in the flue gas flow channel is 20-35 m/s.
The invention has the beneficial effects that:
1. the invention is provided with the recirculation flue gas pipe, and leads part of the flue gas at the outlet of the evaporation tower back to the volute type air chamber again, so that the total amount of the flue gas entering the evaporation tower is maintained, and the flow field in the tower can be kept constant under the condition of any flow of the desulfurization waste water, thereby avoiding the problems of liquid drops sticking to the wall or poor evaporation and the like caused by the change of the flow of the desulfurization waste water.
2. The invention is provided with the recycled flue gas regulating valve, the air quantity testing device, the hot flue gas regulating valve and the temperature measuring device, and the flue gas quantity at the inlet and the outlet of the evaporation tower and the recycled flue gas quantity can be quantitatively controlled, so that the system can accurately control the operation parameters and reduce the energy consumption.
Drawings
FIG. 1 is a schematic structural view of a desulfurization waste water evaporation tower capable of maintaining a constant flow field according to the present invention;
fig. 2 is a graph showing the results of the computational fluid dynamics simulation.
Description of reference numerals: 1-a desulphurisation waste water pipeline; 2-volute type air chamber; 3-an evaporation tower body; 4-a flue gas flow channel; 5-a desulfurized wastewater atomizer; 6-volute type air chamber inlet; 7-an evaporation tower outlet flue; 8-a recirculating flue gas duct; 9-recirculated flue gas regulating valve; 10-variable frequency high temperature fan; 11-an evaporation tower inlet flue; 12-an air volume testing device; 13-hot flue gas regulating valve; 14-temperature measuring device.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The desulfurization waste water evaporation tower capable of keeping a constant flow field leads part of the flue gas at the outlet of the evaporation tower back to the volute type air chamber through the recirculation flue gas pipe, so that the flow field in the evaporation tower is kept constant.
As shown in fig. 1, the desulfurization waste water evaporation tower capable of maintaining a constant flow field comprises an evaporation tower body 3 and a recirculation flue gas pipe 8, wherein the recirculation flue gas pipe 8 is respectively connected with an evaporation tower outlet flue 7 and an evaporation tower inlet flue 11, and the recirculation flue gas pipe 8 is provided with a recirculation flue gas regulating valve 9 and a variable-frequency high-temperature fan 10; a volute type air chamber 2 and a desulfurization waste water atomizer 5 are arranged at the upper part of the evaporation tower body 3, and an annular flue gas flow channel 4 is arranged at the lower part of the volute type air chamber 2; an inlet flue 11 of the evaporation tower is connected with a volute type air chamber inlet 6; an air quantity testing device 12 and a hot flue gas regulating valve 13 are arranged on an inlet flue 11 of the evaporation tower, and a temperature measuring device 14 is arranged on an outlet flue 7 of the evaporation tower.
The ratio of the diameter to the height of the evaporation tower body 3 is 0.5-0.9.
The flue gas flow velocity in the volute type air chamber 2 is designed according to 3-8 m/s.
The flue gas flow velocity in the flue gas flow channel 4 is designed according to 20-35 m/s.
The atomization angle of the desulfurization waste water atomizer 5 is 60-120 degrees, and the atomization particle size is 50-200 μm.
The desulfurization waste water atomizer 5 is connected with the desulfurization waste water pipeline 1.
The wastewater treatment method of the desulfurization wastewater evaporation tower capable of keeping a constant flow field comprises the following steps: the desulfurization waste water is introduced into a desulfurization waste water atomizer 5 and atomized into liquid mist with extremely small particle size, hot flue gas is introduced from a volute type air chamber 2, enters an evaporation tower body 3 after passing through an annular flue gas flow channel 4, the atomized desulfurization waste water is evaporated, and pollutants in the desulfurization waste water are converted into solid phase to enter the flue gas and leave the evaporation tower. In order to keep the flow field in the evaporation tower constant under the condition of any flow of the desulfurization waste water, a recirculating flue gas pipe 8 is arranged to connect an outlet flue 7 of the evaporation tower and an inlet flue 11 of the evaporation tower, and a part of the outlet flue gas of the evaporation tower is led back to the volute type air chamber 2 again. The opening degree of a recirculated flue gas regulating valve 9 and the output force of a variable-frequency high-temperature fan 10 are regulated through an air quantity testing device 12 of an inlet flue 11 of the evaporation tower; the hot flue gas regulating valve 13 is regulated by a temperature measuring device 14 of the evaporation tower outlet flue 7. When the evaporation tower operates, the amount of flue gas entering the evaporation tower is always kept constant, and the flow field in the tower is kept constant, so that the problems of wall sticking of liquid drops or poor evaporation and the like caused by the change of the flow of the desulfurization waste water are solved.
Fig. 2 is a diagram of a computational fluid dynamics simulation result, and a simulation object is a desulfurization wastewater evaporation tower corresponding to a 1000MW boiler unit, wherein: (b) when the flow of the desulfurization waste water is operated according to a design value, the liquid drop track is appropriate, the liquid drop is not sprayed to the wall surface, and the distribution is reasonable; (a) when the flow of the desulfurization waste water is reduced to 50% of a design value, if the flue gas amount is correspondingly reduced to 50% of the original amount, the flow velocity of the flue gas is reduced, liquid drops are transversely spread too much, and the risk of wall sticking exists; (c) when the flow of the desulfurization waste water is increased to 150% of a design value, the flue gas volume is large, liquid drops are concentrated in the middle of the evaporation tower, the effective volume of the evaporation tower cannot be fully utilized, and the method is not reasonable.
Claims (6)
1. The utility model provides a desulfurization waste water evaporation tower that can keep invariable flow field which characterized in that: comprises an evaporation tower body (3) and a recirculation flue gas pipe (8); a recirculating flue gas pipe (8) is respectively connected with an outlet flue (7) of the evaporation tower and an inlet flue (11) of the evaporation tower, and a recirculating flue gas regulating valve (9) and a variable-frequency high-temperature fan (10) are arranged on the recirculating flue gas pipe (8); a volute type air chamber (2) and a desulfurization wastewater atomizer (5) are arranged at the upper part of the evaporation tower body (3), and an annular flue gas flow channel (4) is arranged at the lower part of the volute type air chamber (2); an inlet flue (11) of the evaporation tower is connected with an inlet (6) of the volute type air chamber; an air volume testing device (12) and a hot flue gas regulating valve (13) are arranged on an inlet flue (11) of the evaporation tower, and a temperature measuring device (14) is arranged on an outlet flue (7) of the evaporation tower.
2. The desulfurization waste water evaporation tower capable of maintaining a constant flow field according to claim 1, wherein: the ratio of the diameter to the height of the evaporation tower body (3) is 0.5-0.9.
3. The desulfurization waste water evaporation tower capable of maintaining a constant flow field according to claim 1, wherein: the atomization angle of the desulfurization waste water atomizer (5) is 60-120 degrees, and the atomization particle size is 50-200 mu m.
4. The desulfurization waste water evaporation tower capable of maintaining a constant flow field according to claim 1, wherein: the desulfurization waste water atomizer (5) is connected with the desulfurization waste water pipeline (1).
5. A wastewater treatment method of a desulfurization wastewater evaporation tower capable of maintaining a constant flow field according to claim 1, comprising the steps of:
1) introducing desulfurization waste water into a desulfurization waste water atomizer (5) to be atomized into liquid mist, introducing hot flue gas from a volute type air chamber (2), passing through an annular flue gas flow channel (4), then entering an evaporation tower body (3), evaporating the atomized desulfurization waste water, converting pollutants in the desulfurization waste water into a solid phase, entering the flue gas, and leaving the evaporation tower;
2) a recirculation flue gas pipe (8) connecting the evaporation tower outlet flue (7) and the evaporation tower inlet flue (11) leads a part of the evaporation tower outlet flue gas back to the volute type air chamber (2);
3) the opening degree of a recirculated flue gas adjusting valve (9) and the output of a variable-frequency high-temperature fan (10) are adjusted through an air quantity testing device (12) of an inlet flue (11) of the evaporation tower; a hot flue gas regulating valve (13) is regulated through a temperature measuring device (14) of an evaporation tower outlet flue (7); so that the smoke quantity entering the evaporation tower is always kept constant.
6. The wastewater treatment method of a desulfurization wastewater evaporation tower capable of maintaining a constant flow field according to claim 5, wherein: in the step 1), the flow velocity of the flue gas in the volute type air chamber (2) is 3-8m/s, and the flow velocity of the flue gas in the flue gas flow channel (4) is 20-35 m/s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911364183.4A CN111072090A (en) | 2019-12-26 | 2019-12-26 | Desulfurization wastewater evaporation tower capable of maintaining constant flow field and method |
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| CN201911364183.4A CN111072090A (en) | 2019-12-26 | 2019-12-26 | Desulfurization wastewater evaporation tower capable of maintaining constant flow field and method |
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| CN111072090A true CN111072090A (en) | 2020-04-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443674A (en) * | 2021-07-07 | 2021-09-28 | 南方电网电力科技股份有限公司 | Spray drying tower |
| CN114560519A (en) * | 2022-03-02 | 2022-05-31 | 北京节度科技有限公司 | Coal fired power plant flue gas desulfurization waste water evaporation tower |
Citations (2)
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|---|---|---|---|---|
| CN101703884A (en) * | 2009-12-18 | 2010-05-12 | 哈尔滨工业大学 | Wet desulfurization tower based flue gas desulphurization method capable of enhancing adaptability to low load |
| CN211770395U (en) * | 2019-12-26 | 2020-10-27 | 浙江浙能技术研究院有限公司 | Desulfurization waste water evaporation tower capable of keeping constant flow field |
-
2019
- 2019-12-26 CN CN201911364183.4A patent/CN111072090A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101703884A (en) * | 2009-12-18 | 2010-05-12 | 哈尔滨工业大学 | Wet desulfurization tower based flue gas desulphurization method capable of enhancing adaptability to low load |
| CN211770395U (en) * | 2019-12-26 | 2020-10-27 | 浙江浙能技术研究院有限公司 | Desulfurization waste water evaporation tower capable of keeping constant flow field |
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| Title |
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| 王晓焙等: "330 MW机组脱硫废水旁路烟道喷雾干燥技术数值模拟与应用示范", 热力发电, 30 June 2019 (2019-06-30), pages 97 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113443674A (en) * | 2021-07-07 | 2021-09-28 | 南方电网电力科技股份有限公司 | Spray drying tower |
| CN114560519A (en) * | 2022-03-02 | 2022-05-31 | 北京节度科技有限公司 | Coal fired power plant flue gas desulfurization waste water evaporation tower |
| CN114560519B (en) * | 2022-03-02 | 2022-11-29 | 北京节度科技有限公司 | Coal fired power plant flue gas desulfurization waste water evaporation tower |
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