CN103897760B - Methane purification system - Google Patents
Methane purification system Download PDFInfo
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- CN103897760B CN103897760B CN201410143883.1A CN201410143883A CN103897760B CN 103897760 B CN103897760 B CN 103897760B CN 201410143883 A CN201410143883 A CN 201410143883A CN 103897760 B CN103897760 B CN 103897760B
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Abstract
The invention provides a kind of methane purification system, this methane purification system comprises: gas-holder (150); Circulating water system, comprise multistage desorption tower and water reservoir (110), water reservoir (110) has water reservoir first water-in and water reservoir first water outlet, and the final stage desorption tower in water reservoir first water-in, water reservoir first water outlet and multistage desorption tower forms the first circulation loop; Reflux line (1), the first end of reflux line (1) is connected with gas-holder (150), and the second end of reflux line (1) is connected with final stage desorption tower, and reflux line (1) is provided with switch-valve.Technical scheme of the present invention efficiently solves methane purification system in prior art and again starts slower problem.
Description
Technical field
The present invention relates to methane purification technical field, in particular to a kind of methane purification system.
Background technology
In the face of the worldwide energy and climate crisis, China makes Important Adjustment in " 12 " period to energy structure.The mode reducing carbon intensity changes based on the energy structure of coal, oil, increases the renewable energy source of clean, just reduce carbon intensity like this from feed end.Biogas belongs to the renewable energy source of clean, therefore national " 12 " biogas construction of making overall planning, and the energy construction of attaching most importance to biogas is included in country " 12 " energy development strategy.
Biogas is easily subject to the impact of envrionment temperature and raw material wastewater flow rate during the fermentation, causes the fluctuation of product methane quantity and biogas component and fluctuation larger.Meanwhile, Marsh gas purifying device is by products C NG(compressed natural gas) restriction that stores and sell, cannot continuous operation as general chemical plant installations, there is frequent startup-shutdown problem.In prior art, in methane purification system, raw material biogas enters separator, and the free-water of raw material biogas and solid impurity are separated by separator, are sloughed by hydrogen sulfide through thionizer.First compressor passes into the bottom on absorption tower after being compressed by biogas, absorption tower absorbs the carbonic acid gas in biogas.Gas product flows out from the top on absorption tower, and the gas product then after the processed of dehydration equipment is stored in gas-holder.
In water system in methane purification system, washings, after absorption tower completes absorption, goes to the top of one-level desorption tower at the bottom of the tower on absorption tower.Secondary desorption tower is entered after the washings of the desorb of one-level desorption tower is decompressed to normal pressure.Washings bottom secondary desorption tower is by fluid column static pressure from flowing to three grades of desorption towers, and washings is divided into two portions after desorb in three grades of desorption towers.Wherein, the top that the first water pump turns back to absorption tower gone to by a part of washings, then continues working cycle next time.The middle part that the second water pump turns back to three grades of desorption towers gone to by another part washings, and the washings returned mixes with the washings in three grades of desorption towers.Mixed washings is divided into two portions again, continues working cycle next time.
When methane purification system starts start again, only have when the bottom on absorption tower has biogas to pass into, water system just starts slowly to enter in operation.Pass into the middle part of three grades of desorption towers from some gas product of top on absorption tower, this portioned product gas is called gas stripping gas.Utilize gas product to do gas stripping gas the deep carbon dioxide in three grades of desorption towers to be parsed, effectively can improve purity and the yield of gas product methane.But when methane purification system starts start again, the bottom on absorption tower does not have methane and passes into, and the top on absorption tower does not also produce gas product, just do not pass into gas stripping gas in three grades of desorption towers, three grades of desorption towers are with regard to cisco unity malfunction.When methane is greater than 97% at the content of gas product, gas product just can use as the gas stripping gas of three grades of Analytic Towers.Methane purification system is greater than 97% to methane at the content of gas product from start and needs operation more than one hour.From the foregoing, methane purification system is slow, when frequent startup-shutdown, there is the problem of energy consumption increase, time waste.
Summary of the invention
The present invention aims to provide a kind of methane purification system, again starts slower problem to solve methane purification system in prior art.
To achieve these goals, the invention provides a kind of methane purification system, comprising: gas-holder; Circulating water system, comprises multistage desorption tower and water reservoir, and water reservoir has water reservoir first water-in and water reservoir first water outlet, and the final stage desorption tower in water reservoir first water-in, water reservoir first water outlet and multistage desorption tower forms the first circulation loop; Reflux line, the first end of reflux line is connected with gas-holder, and the second end of reflux line is connected with final stage desorption tower, and reflux line is provided with switch-valve.
Further, methane purification system also comprises: separator, thionizer, the first compressor and dehydration equipment, and separator, thionizer, the first compressor, circulating water system, dehydration equipment are connected successively with gas-holder; Multistage desorption tower comprises one-level desorption tower, secondary desorption tower and three grades of desorption towers, and three grades of desorption towers are final stage desorption tower, and circulating water system also comprises absorption tower, the first water pump, the second water pump and the first cooling module; The bottom on absorption tower is connected with the first compressor, and the top on absorption tower is connected with dehydration equipment, and the second end of reflux line is connected with the middle part of three grades of desorption towers; Absorption tower, one-level desorption tower, secondary desorption tower, three grades of desorption towers and the first water pump connect and compose the second circulation loop successively, and three grades of desorption towers, the second water pump and first cooling modules form the 3rd circulation loop.
Further, water reservoir has water reservoir second water-in and water reservoir second water outlet, circulating water system also comprises: the 3rd water pump and the second cooling module, and water reservoir second water-in, water reservoir second water outlet, the 3rd water pump and the second cooling module form the 4th circulation loop.
Further, three grades of desorption towers comprise top water-in, middle part water-in, the first water outlet, the second water outlet and the 3rd water outlet, top water-in is connected with secondary desorption tower, first water outlet is connected with absorption tower, first water pump is arranged between the first water outlet and absorption tower, first cooling module and the second water pump are connected between the second water outlet and middle part water-in, and water reservoir first water-in is connected with the 3rd water outlet.
Further, water reservoir first water outlet is connected to the A point place of the pipeline between the second water outlet and the second water pump.
Further, the first end of gas-holder and reflux line passes through Flange joint.
Further, pipeline between the first water outlet and the first water pump is provided with the first valve, pipeline between the second water outlet and A point is provided with the second valve, pipeline between the 3rd water outlet and water reservoir first water-in is provided with the 3rd valve, pipeline between water reservoir first water outlet and A point is provided with the 4th valve, second water pump is arranged between the second water outlet and the first cooling module, the pipeline between A point and the second water pump is provided with the 5th valve.
Further, the pipeline between the second water pump and the first cooling module is provided with the 6th valve, the pipeline between the first cooling module and middle part water-in is provided with the 7th valve.
Further, 3rd water pump is arranged between water reservoir second water outlet and the second cooling module, pipeline between water reservoir second water outlet and the 3rd water pump is provided with the 8th valve, pipeline between water reservoir second water-in and the second cooling module is provided with the 9th valve, the pipeline between the 3rd water pump and the second cooling module is provided with the tenth valve.
Apply technical scheme of the present invention, between the middle part of the final stage desorption tower in gas-holder and multistage desorption tower, set up reflux line.After methane purification system initial start-up, in gas-holder, be full of middle pressure Sweet natural gas.When again starting, open the switch-valve on reflux line, the gas product of gas-holder is turned back in the middle part of final stage desorption tower, the deep carbon dioxide in final stage desorption tower is resolved.The gas product utilizing initial start-up to make, directly as the gas stripping gas of final stage desorption tower, during initial start-up, makes to store completely cold washings in water reservoir.When again starting, cooling module is not needed to cool washings, directly utilize the cold washings in water reservoir to provide cold washings for circulating water system, make the temperature in the washings of circulating water system be down to about 8 degree fast, accelerate the startup of circulating water system.Just making circulating water system be in operation when starting shooting like this, accelerating water system and starting, greatly reducing start time again, and then realize again starting methane purification system rapidly.Above-mentioned technical process is simple, easy to operate, effectively reduces start time, thus reduces energy consumption and save working cost.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the structural representation of the embodiment according to methane purification system of the present invention.
Above-mentioned accompanying drawing comprises the following drawings mark:
1, reflux line; 10, separator; 20, thionizer; 30, the first compressor; 40, absorption tower; 50, one-level desorption tower; 60, three grades of desorption towers; 70, secondary desorption tower; 80, the second water pump; 90, the first cooling module; 100, the first water pump; 110, water reservoir; 120, the second cooling module; 130, the 3rd water pump; 140, dehydration equipment; 150, gas-holder; 160, the second compressor; 170, housing; 180, gas cylinder group is added; 190, gas column is added.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figure 1, the methane purification system of the present embodiment comprises gas-holder 150, circulating water unifies reflux line 1.Circulating water system comprises multistage desorption tower and water reservoir 110, water reservoir 110 has water reservoir first water-in and water reservoir first water outlet, final stage desorption tower in water reservoir first water-in, water reservoir first water outlet and multistage desorption tower forms the first circulation loop, the first end of reflux line 1 is connected with gas-holder 150, second end of reflux line 1 is connected with final stage desorption tower, and reflux line 1 is provided with switch-valve.
The methane purification system of application the present embodiment, has set up reflux line 1 between the middle part of the final stage desorption tower in gas-holder 150 and multistage desorption tower.After methane purification system initial start-up, in gas-holder 150, be full of middle pressure Sweet natural gas.When again starting, open the switch-valve on reflux line 1, the gas product of gas-holder 150 is turned back in the middle part of final stage desorption tower, the deep carbon dioxide in final stage desorption tower is resolved.The gas product utilizing initial start-up to make, directly as the gas stripping gas of final stage desorption tower, during initial start-up, makes to store completely cold washings in water reservoir 110.When again starting, cooling module is not needed to cool washings, directly utilize the cold washings in water reservoir 110 to provide cold washings for circulating water system, make the temperature in the washings of circulating water system be down to about 8 degree fast, accelerate the startup of circulating water system.Just making circulating water system be in operation when starting shooting like this, accelerating water system and starting, greatly reducing start time again, and then realize again starting methane purification system rapidly.Above-mentioned technical process is simple, easy to operate, effectively reduces start time, thus reduces energy consumption and save working cost.
In the present embodiment, methane purification system also comprises separator 10, thionizer 20, first compressor 30 and dehydration equipment 140, separator 10, thionizer 20, first compressor 30, circulating water system, dehydration equipment 140 is connected successively with gas-holder 150, multistage desorption tower comprises one-level desorption tower 50, secondary desorption tower 70 and three grades of desorption towers 60, three grades of desorption towers 60 are final stage desorption tower, circulating water system also comprises absorption tower 40, first water pump 100, second water pump 80 and the first cooling module 90, the bottom on absorption tower 40 is connected with the first compressor 30, the top on absorption tower 40 is connected with dehydration equipment 140, second end of reflux line 1 is connected with the middle part of three grades of desorption towers 60, absorption tower 40, one-level desorption tower 50, secondary desorption tower 70, three grades of desorption towers 60 and the first water pump 100 connect and compose the second circulation loop successively, three grades of desorption towers 60, second water pump 80 and the first cooling module 90 form the 3rd circulation loop.
The working process of methane purification system is as follows:
Raw material biogas enters separator 10, and the free-water of raw material biogas and solid impurity are separated by separator 10, is sloughed by hydrogen sulfide through thionizer 20.Pass into the bottom on absorption tower 40 after biogas compresses by the first compressor 30, absorption tower 40 absorbs the carbonic acid gas in biogas.After absorption tower 40 absorbs, methane flows out from the top on absorption tower 40, and the gas product then after the processed of dehydration equipment 140 is stored in gas-holder 150, and when methane is greater than 97% at the content of gas product, gas product just can normally use.
In the present embodiment, methane purification system also comprises aerating equipment, and aerating equipment comprises the second compressor 160, sequential control cabinet 170, adds gas cylinder group 180, adds gas column 190 and air filling gun.
In the present embodiment, the pipeline on the pipeline on the pipeline on the pipeline on the pipeline between separator 10 and thionizer 20, between thionizer 20 and the first compressor 30, between the first compressor 30 and absorption tower 40, between absorption tower 40 and dehydration equipment 140 and between dehydration equipment 140 and gas-holder 150 is equipped with valve.
In the present embodiment, three grades of desorption towers 60 comprise top water-in, middle part water-in, the first water outlet, the second water outlet and the 3rd water outlet, top water-in is connected with secondary desorption tower 70, first water outlet is connected with absorption tower 40, first water pump 100 is arranged between the first water outlet and absorption tower 40, first cooling module 90 and the second water pump 80 are connected between the second water outlet and middle part water-in, and water reservoir first water-in is connected with the 3rd water outlet.
In order to reduce the usage quantity of equipment, in the present embodiment, water reservoir first water outlet is connected to the A point place of the pipeline between the second water outlet and the second water pump 80.
The working process of circulating water system is as follows:
Washings, after absorption tower 40 completes absorption, goes to the top of one-level desorption tower 50 at the bottom of the tower on absorption tower 40.Secondary desorption tower 70 is entered after the washings of the desorb of one-level desorption tower 50 is decompressed to normal pressure.Washings bottom secondary desorption tower 70 is by fluid column static pressure from flowing to three grades of desorption towers 60, and washings is divided into three parts after desorb in three grades of desorption towers 60.Wherein, first part's washings sends into absorption tower 40 after the first water outlet goes to the first water pump 100, and first part's washings is called circulating cleaning solution.Circulating cleaning solution enters absorption tower 40 and circulates next time.Second section washings goes to the second water pump 80 from the second water outlet, and enter three grades of desorption towers 60 from middle part water-in after being cooled by the first cooling module 90, second section washings is called cooling washings.Part III washings goes to water reservoir 110 from the 3rd water outlet, and Part III washings is called cold-storage washings.Preferably, washings is water.
When methane purification system initial start-up, when methane purification system steady running, just qualified gas product can be produced.During initial start-up, store full cold water by water reservoir 110.After initial start-up, in gas-holder 150, store middle pressure Sweet natural gas.When methane purification system starts again, making the gas product of gas-holder 150 do gas stripping gas turns back in the middle part of three grades of desorption towers 60, by deep carbon dioxide desorb remaining in the washings of three grades of desorption towers 60, then gas stripping gas turns back to separator 10 from the top of three grades of desorption towers 60, can reuse gas stripping gas like this.The cold water in water reservoir 110 is utilized to be sent into the top on absorption tower 40 by the second circulation loop and the 3rd circulation loop, effectively reduce the washings circulating cooling time upon actuation further, circulating water system realizes starting fast, thus realizes the quick startup of methane purification system.Methane purification system does not increase equipment, decreases cost of investment.Can also OnNow be realized, effectively save working cost and start time.
In the present embodiment, water reservoir 110 has water reservoir second water-in and water reservoir second water outlet, circulating water system also comprises the 3rd water pump 130 and the second cooling module 120, water reservoir second water-in, water reservoir second water outlet, the 3rd water pump 130 and the second cooling module 120 form the 4th circulation loop, and namely water reservoir 110, the 3rd water pump 130 and the second cooling module 120 form the 4th circulation loop.3rd water pump 130 is extracted in washings to the second cooling module by water reservoir second water outlet from water reservoir 110, washings cools by the second cooling module 120, cooled washings is flowed in water reservoir 110 by water reservoir second water-in, then repeats said process.The washings of water reservoir 110, by the circulating cooling method in the 4th circulation loop, remains in default temperature range by cold-storage washings.The temperature of the washings in water reservoir 110 is made to remain in default temperature range like this, in order to using when methane purification system starts again.
In the present embodiment, gas-holder 150 passes through Flange joint with the first end of reflux line 1.Preferably, switch-valve is automatic switch valve.
In the present embodiment, pipeline between the first water outlet and the first water pump 100 is provided with the first valve, pipeline between the second water outlet and A point is provided with the second valve, pipeline between the 3rd water outlet and water reservoir first water-in is provided with the 3rd valve, pipeline between water reservoir first water outlet and A point is provided with the 4th valve, second water pump 80 is arranged between the second water outlet and the first cooling module 90, the pipeline between A point and the second water pump 80 is provided with the 5th valve.In the present embodiment, the pipeline between the second water pump 80 and the first cooling module 90 is provided with the 6th valve, the pipeline between the first cooling module 90 and middle part water-in is provided with the 7th valve.In the present embodiment, 3rd water pump 130 is arranged between water reservoir second water outlet and the second cooling module 120, pipeline between water reservoir second water outlet and the 3rd water pump 130 is provided with the 8th valve, pipeline between water reservoir second water-in and the second cooling module 120 is provided with the 9th valve, the pipeline between the 3rd water pump 130 and the second cooling module 120 is provided with the tenth valve.Preferably, the first valve is manually-operated gate to the 6th valve, the 8th valve and the tenth valve, and the 7th valve and the 9th valve are variable valve.
At the present embodiment, liquid-phase outlet at the bottom of the tower on absorption tower 40 is connected by the top of pipeline with one-level desorption tower 50, the top gas phase outlet of one-level desorption tower 50 is connected with separator 10, the bottom liquid phases outlet of one-level desorption tower 50 is connected with the top of secondary desorption tower 70, the top gas phase outlet of secondary desorption tower 70 is connected with air, the bottom liquid phases outlet of secondary desorption tower 70 is connected with the top of three grades of desorption towers 60, the top gas phase outlet of three grades of desorption towers 60 is connected with separator 10, first water pump 100 is connected with the top on absorption tower 40, absorption tower 40 top gas phase outlet respectively with dehydration equipment 140, the middle part of three grades of desorption towers 60 connects.
At the present embodiment, on pipeline between absorption tower 40 and one-level desorption tower 50, on pipeline between one-level desorption tower 50 and separator 10, on pipeline between one-level desorption tower 50 and secondary desorption tower 70, on pipeline between secondary desorption tower 70 and three grades of desorption towers 60, on pipeline between three grades of desorption towers 60 and separator 10, pipeline on pipeline between the first water pump 100 and absorption tower 40 and between absorption tower 40 and three grades of desorption towers 60 is provided with variable valve, pipeline between absorption tower 40 and dehydration equipment 140 is provided with manually-operated gate.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a methane purification system, is characterized in that, comprising:
Gas-holder (150);
Circulating water system, comprise multistage desorption tower and water reservoir (110), described water reservoir (110) has water reservoir first water-in and water reservoir first water outlet, and the final stage desorption tower in described water reservoir first water-in, described water reservoir first water outlet and described multistage desorption tower forms the first circulation loop;
Reflux line (1), the first end of described reflux line (1) is connected with described gas-holder (150), second end of described reflux line (1) is connected with described final stage desorption tower, described reflux line (1) is provided with switch-valve, when described methane purification system starts again, described switch-valve is opened using the gas product will made during described methane purification system initial start-up as the gas stripping gas in described final stage desorption tower.
2. methane purification system according to claim 1, is characterized in that,
Described methane purification system also comprises: separator (10), thionizer (20), the first compressor (30) and dehydration equipment (140), and described separator (10), described thionizer (20), described first compressor (30), described circulating water system, described dehydration equipment (140) are connected successively with described gas-holder (150);
Described multistage desorption tower comprises one-level desorption tower (50), secondary desorption tower (70) and three grades of desorption towers (60), described three grades of desorption towers (60) are described final stage desorption tower, and described circulating water system also comprises absorption tower (40), the first water pump (100), the second water pump (80) and the first cooling module (90);
The bottom on described absorption tower (40) is connected with described first compressor (30), the top on described absorption tower (40) is connected with described dehydration equipment (140), and the second end of described reflux line (1) is connected with the middle part of described three grades of desorption towers (60);
Described absorption tower (40), described one-level desorption tower (50), described secondary desorption tower (70), described three grades of desorption towers (60) and described first water pump (100) connect and compose the second circulation loop successively, and described three grades of desorption towers (60), described second water pump (80) and described first cooling module (90) form the 3rd circulation loop.
3. methane purification system according to claim 2, is characterized in that, described water reservoir (110) has water reservoir second water-in and water reservoir second water outlet, and described circulating water system also comprises:
3rd water pump (130) and the second cooling module (120), described water reservoir second water-in, described water reservoir second water outlet, described 3rd water pump (130) and described second cooling module (120) form the 4th circulation loop.
4. methane purification system according to claim 3, it is characterized in that, described three grades of desorption towers (60) comprise top water-in, middle part water-in, first water outlet, second water outlet and the 3rd water outlet, described top water-in is connected with described secondary desorption tower (70), described first water outlet is connected with described absorption tower (40), described first water pump (100) is arranged between described first water outlet and described absorption tower (40), described first cooling module (90) and described second water pump (80) are connected between described second water outlet and described middle part water-in, described water reservoir first water-in is connected with described 3rd water outlet.
5. methane purification system according to claim 4, is characterized in that, described water reservoir first water outlet is connected to the A point place of the pipeline between described second water outlet and described second water pump (80).
6. methane purification system according to claim 1, is characterized in that, described gas-holder (150) passes through Flange joint with the first end of described reflux line (1).
7. methane purification system according to claim 5, it is characterized in that, pipeline between described first water outlet and described first water pump (100) is provided with the first valve, pipeline between described second water outlet and described A point is provided with the second valve, pipeline between described 3rd water outlet and described water reservoir first water-in is provided with the 3rd valve, pipeline between described water reservoir first water outlet and described A point is provided with the 4th valve, described second water pump (80) is arranged between described second water outlet and described first cooling module (90), pipeline between described A point and the second water pump (80) is provided with the 5th valve.
8. methane purification system according to claim 7, it is characterized in that, pipeline between described second water pump (80) and described first cooling module (90) is provided with the 6th valve, the pipeline between described first cooling module (90) and described middle part water-in is provided with the 7th valve.
9. methane purification system according to claim 3, it is characterized in that, described 3rd water pump (130) is arranged between described water reservoir second water outlet and described second cooling module (120), pipeline between described water reservoir second water outlet and described 3rd water pump (130) is provided with the 8th valve, pipeline between described water reservoir second water-in and described second cooling module (120) is provided with the 9th valve, the pipeline between described 3rd water pump (130) and described second cooling module (120) is provided with the tenth valve.
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| CN201410143883.1A CN103897760B (en) | 2014-04-10 | 2014-04-10 | Methane purification system |
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| CN107019995B (en) * | 2017-06-08 | 2019-06-07 | 山东省科学院能源研究所 | The method and vacuum desorption discharge system of purifying biogas are washed for pressure (hydraulic) water |
| CN109401803A (en) * | 2018-12-06 | 2019-03-01 | 开封黄河空分集团有限公司 | The marsh gas water that a kind of interior outer energy is taken into account and energy utilization rate is high washes purification system |
| CN109401804A (en) * | 2018-12-08 | 2019-03-01 | 内蒙古弘达生物环保科技有限责任公司 | A kind of methane purification system with peak regulating function |
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| US6607585B2 (en) * | 1997-02-11 | 2003-08-19 | David Morrow | Raw natural gas processing system and method of processing raw natural gas |
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| CN1056064A (en) * | 1990-05-01 | 1991-11-13 | 金属股份有限公司 | The method of the gas of purification sulfide hydrogen and carbonic acid gas |
| CN1627980A (en) * | 2002-04-15 | 2005-06-15 | 弗劳尔公司 | Configurations and methods for improved acid gas removal |
| CN1938074A (en) * | 2004-03-19 | 2007-03-28 | 月岛机械株式会社 | Apparatus for concentrating methane gas |
| CN102391899A (en) * | 2011-10-26 | 2012-03-28 | 西南化工研究设计院 | Technology for desorbing acid gas in methane |
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