CN103244213B - For ORC power generation system and the electricity-generating method thereof of offshore platform - Google Patents
For ORC power generation system and the electricity-generating method thereof of offshore platform Download PDFInfo
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Abstract
The invention discloses a kind of ORC power generation system for offshore platform and electricity-generating method thereof, the heat resource of offshore platform can be made full use of.This system mainly comprises the heat exchanger be connected with thermal source, power take-off, the generator be connected with the clutch end of power take-off, organic working medium recycle pump, condenser, thermal source comprises boiler, the conduction oil outlet of boiler is connected with the thermal source inlet of heat exchanger by triethylene glycol reboiler, the thermal source outlet of heat exchanger is connected with the conduction oil entrance of boiler by heat conduction oil circulating pump, also comprise regenerator, the organic working medium that this regenerator is discharged for the device that outputs power and the organic working medium recycle pump organic working medium of discharging carry out exchange heat, to make full use of the residue heat energy of the organic working medium of being discharged by power take-off.By power take-off drive electrical generators being driven to generate electricity by the organic working medium of heat-conducting oil heating.
Description
Technical field
The present invention relates to a kind of power generation system and electricity-generating method, particularly relate to a kind of ORC power generation system for offshore platform and electricity-generating method thereof.
Background technique
Transmit electric power from seashore to offshore platform, short distance can be feasible.But when distance shore line is far away, the electricity needs of offshore platform generally uses gas turbine to meet.The delivery temperature of gas turbine is relatively high, under operating mode at full capacity, and exhaust temperature about 500 DEG C.The 28-34% of institute's consume fuel energy generally can be converted into air horsepower by typical gas turbine, and the fuel energy of remaining part then passes through toxic emission.This part waste gas contains a large amount of heat energy, if not being used, causes serious waste.
ORC i.e. organic Rankine bottoming cycle, the power generation system utilizing this Technology design to become is ORC power generation system.At present, existing ORC power generation system generally comprises two heat exchangers, power take-off, the generator be connected with power take-off and a recycle pump.Such as " refrigeration journal " February the 33rd in 2012, volume the 1st phase disclosed an above-mentioned ORC power generation system.And China Patent Publication No. CN1950591A also discloses a similar ORC power generation system.Each device in above-mentioned this power generation system is connected to form a circulation loop.Organic media circulates in this loop.One of them heat exchanger is connected with thermal source and carries out heat exchange, and organic working medium is heated into steam condition, and the organic media of steam condition enters power take-off acting, and power take-off drive electrical generators generates electricity.Organic working medium then enters another heat exchanger and carries out condensation formation liquid, this heat exchanger i.e. condenser.Cooled organic working medium forms overcooled liquid state under the pressure effect of recycle pump, then enters in the heat exchanger that is connected with thermal source.Generated electricity by above-mentioned circulation.Existing this power generation system has the following disadvantages: 1, organic working medium is going back reserve part heat energy after power take-off acting, and these heat energy are slatterned by condenser heat rejection, and system effectiveness is very low.2, system is after Long-Time Service, and inner organic working medium generation loss, cannot supplement in time.3, suitable ORC power generation system is not had for offshore platform.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of ORC power generation system for offshore platform making full use of the heat resource of offshore platform.
The technical solution adopted for the present invention to solve the technical problems is: for the ORC power generation system of offshore platform, comprise the heat exchanger be connected with thermal source, power take-off, the generator be connected with the clutch end of power take-off, organic working medium recycle pump, condenser, described heat exchanger comprises thermal source inlet, thermal source outlet, heat exchanger organic working medium entrance and the outlet of heat exchanger organic working medium, power take-off comprises output unit organic working medium entrance and the outlet of output unit organic working medium, the outlet of heat exchanger organic working medium is connected with output unit organic working medium entrance, condenser comprises condenser organic working medium entrance and the outlet of condenser organic working medium, described thermal source comprises boiler, described boiler comprises conduction oil entrance, conduction oil exports, smoke inlet and smoke outlet, oil duct is provided with between conduction oil entrance and conduction oil outlet, the flue gas channel carrying out exchange heat for the conduction oil in flue gas and oil duct is provided with between smoke inlet and smoke outlet, the conduction oil outlet of boiler is connected with the thermal source inlet of heat exchanger by triethylene glycol reboiler, the thermal source outlet of heat exchanger is connected with the conduction oil entrance of boiler by heat conduction oil circulating pump, also comprise regenerator, the first heat exchange road is provided with between first organic working medium entrance of regenerator and the first organic working medium export, the second heat exchange road is provided with between second organic working medium entrance of regenerator and the second organic working medium export, first organic working medium entrance of regenerator exports with output unit organic working medium and is connected, first organic working medium outlet of regenerator is connected with condenser organic working medium entrance, the outlet of condenser organic working medium is connected with the second organic working medium entrance of regenerator by organic working medium recycle pump, second organic working medium outlet of regenerator is connected with heat exchanger organic working medium entrance.
The flue gas that said system can utilize offshore platform combustion engine to discharge generates electricity, and the heat energy of offshore platform is used for generating and impels the work of triethylene glycol reboiler.The heat energy of offshore platform can be utilized effectively fully.Meanwhile, by arranging regenerator, the residue heat energy of the organic working medium that the device that can output power is discharged makes full use of, and utilizes this part heat energy can heat supercooled liquid organic working medium.
Further: between described condenser and organic working medium recycle pump, be also connected with liquid container, described liquid container is provided with organic working medium supplementary device.
Further: described heat exchanger comprises preheater and the vaporizer of series connection, the thermal source inlet of described heat exchanger and the outlet of heat exchanger organic working medium are all arranged on an evaporator, and thermal source outlet and the heat exchanger organic working medium entrance of heat exchanger are all arranged on preheater.
Further: described power take-off is ORC turbine, described ORC turbine is provided with the sealing configuration for preventing organic working medium from leaking.
Further: between the thermal source outlet of described heat exchanger and heat conduction oil circulating pump, be connected with oil storage tank.
Present invention also offers a kind of electricity-generating method adopting the above-mentioned ORC power generation system for offshore platform, first the conduction oil entering boiler is made to absorb the heat of flue gas by boiler, then conduction oil is made to make the work of triethylene glycol reboiler through triethylene glycol reboiler, then conduction oil enters heat exchanger and organic working medium in system is heated into gaseous state, and conduction oil enters boiler by heat conduction oil circulating pump after heat exchanger thermal source outlet flow goes out; Gaseous state organic working medium impels the generating of power take-off acting drive electrical generators, the organic working medium that power take-off is discharged enters condenser through regenerator and is cooled to liquid state, liquid organic working medium forms supercooled liquid organic working medium through the pressurization of organic working medium recycle pump, supercooled liquid organic working medium absorbs the heat of the gaseous state organic working medium in the first heat exchange road of regenerator after entering the second heat exchange road of regenerator, then enter in heat exchanger.
Further: between described condenser and organic working medium recycle pump, be also connected with liquid container, described liquid container is provided with organic working medium supplementary device, in system, supplements organic working medium by organic working medium supplementary device.
Further: described heat exchanger comprises preheater and the vaporizer of series connection, the thermal source inlet of described heat exchanger and the outlet of heat exchanger organic working medium are all arranged on an evaporator, and thermal source outlet and the heat exchanger organic working medium entrance of heat exchanger are all arranged on preheater.
Further: between the thermal source outlet of described heat exchanger and heat conduction oil circulating pump, be connected with oil storage tank.
Further: described power take-off is ORC turbine, described ORC turbine is provided with the sealing configuration for preventing organic working medium from leaking.
The invention has the beneficial effects as follows:
1, can make full use of the heat resource of offshore platform, system sets up heat-conducting oil heating system, avoids organic working medium and directly contacts by thermal response with high-temperature flue gas, causes the accidents such as safe, rotten.
2, the effect of buffering can be played by liquid container on the one hand, ensure that organic working medium continues to circulate smoothly in system, also can supplement organic working medium in time in system on the other hand.
3, the effect of buffering can be played by oil storage tank on the one hand, ensure that conduction oil continues to circulate smoothly, thus ensure that the temperature of organic working medium in heat exchanger there will not be fluctuation, be conducive to protection organic working medium not because temperature fluctuation generation physical property changes; Conduction oil can be supplemented in time on the other hand.And, can the amount of conduction oil in control system by oil storage tank, and then the temperature stabilization of conduction oil can be ensured according to the amount of conduction oil in the next timely adjust system of the temperature of the smoke inlet of boiler, thus the temperature stabilization of organic working medium can be ensured, there will not be fluctuation.
4, adopt vaporizer and preheater series connection to use, can heat exchange efficiency be improved.Organic working medium exports at preheater the liquid condition that reaches capacity, and completes phase transformation in vaporizer.Design like this, both preferentially met Process heat demand, can make again all to obtain higher heat-transfer coefficient in preheater, vaporizer.
5, can prevent organic working medium from leaking by sealing configuration.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the ORC power generation system for offshore platform of the present invention.
Be labeled as in figure: heat exchanger 1, thermal source inlet 11, heat exchanger organic working medium outlet 12, thermal source outlet 13, heat exchanger organic working medium entrance 14, vaporizer 15, preheater 16, power take-off 2, output unit organic working medium entrance 21, clutch end 22, output unit organic working medium outlet 23, generator 3, regenerator 4, first organic working medium entrance 41, first organic working medium outlet 42, second organic working medium entrance 44, second organic working medium outlet 43, condenser 5, condenser organic working medium entrance 51, condenser organic working medium outlet 52, liquid container 6, organic working medium recycle pump 7, boiler 8, conduction oil entrance 84, conduction oil outlet 81, smoke inlet 82, smoke outlet 83, triethylene glycol reboiler 9, heat conduction oil circulating pump 100, oil storage tank 200.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
As shown in Figure 1, ORC power generation system for offshore platform of the present invention, comprise the heat exchanger 1 be connected with thermal source, power take-off 2, the generator 3 be connected with the clutch end 22 of power take-off 2, organic working medium recycle pump 7, condenser 5, described heat exchanger 1 comprises thermal source inlet 11, thermal source outlet 13, heat exchanger organic working medium entrance 14 and heat exchanger organic working medium outlet 12, power take-off 2 comprises output unit organic working medium entrance 21 and output unit organic working medium outlet 23, heat exchanger organic working medium outlet 12 is connected with output unit organic working medium entrance 21, condenser 5 comprises condenser organic working medium entrance 51 and condenser organic working medium outlet 52, described thermal source comprises boiler 8, described boiler 8 comprises conduction oil entrance 84, conduction oil outlet 81, smoke inlet 82 and smoke outlet 83, oil duct is provided with between conduction oil entrance 84 and conduction oil outlet 81, the flue gas channel carrying out exchange heat for the conduction oil in flue gas and oil duct is provided with between smoke inlet 82 and smoke outlet 83, the conduction oil outlet 81 of boiler 8 is connected with the thermal source inlet 11 of heat exchanger 1 by triethylene glycol reboiler 9, the thermal source outlet 13 of heat exchanger 1 is connected with the conduction oil entrance 84 of boiler 8 by heat conduction oil circulating pump 100, also comprise regenerator 4, first organic working medium entrance 41 of regenerator 4 and the first organic working medium are provided with the first heat exchange road between exporting 42, second organic working medium entrance 44 of regenerator 4 and the second organic working medium are provided with the second heat exchange road between exporting 43, first organic working medium entrance 41 and the output unit organic working medium of regenerator 4 export 23 and are connected, first organic working medium outlet 42 of regenerator 4 is connected with condenser organic working medium entrance 51, condenser organic working medium outlet 52 is connected with the second organic working medium entrance 44 of regenerator 4 by organic working medium recycle pump 7, second organic working medium outlet 43 of regenerator is connected with heat exchanger organic working medium entrance 14.Above-mentioned condenser can adopt the types of cooling such as air cooling.Above-mentioned regenerator 4 is also a kind of heat exchanger, and its principle is identical with heat exchanger, exactly for being exchanged by the heat of the organic working medium in the heat of the organic working medium in the first heat exchange road and the second heat exchange road.The flow direction of conduction oil is contrary with the flow direction of organic working medium, and this form is called countercurrent heat-transfer, otherwise is called that following current is conducted heat.Countercurrent heat-transfer is higher than following current heat transfer efficiency, can effectively reduce heat exchanger heat exchange area, reduces device fabrication cost.Therefore countercurrent heat-transfer is preferably.
During use, first the conduction oil entering boiler oil duct is made to absorb the heat of the flue gas that combustion engine is discharged by boiler 8, then conduction oil is made to make the work of triethylene glycol reboiler through triethylene glycol reboiler 9, then conduction oil enters heat exchanger 1 and organic working medium in system is heated into gaseous state, and conduction oil enters boiler 8 by heat conduction oil circulating pump 100 after heat exchanger thermal source outlet flow goes out; Gaseous state organic working medium impels power take-off 2 drive electrical generators 3 that does work to generate electricity, the organic working medium that power take-off 2 is discharged enters condenser 5 through regenerator 4 and is cooled to liquid state, liquid organic working medium is pressurizeed through organic working medium recycle pump 7 and is formed supercooled liquid organic working medium, supercooled liquid organic working medium absorbs the heat of the gaseous state organic working medium in the first heat exchange road of regenerator 4 after entering the second heat exchange road of regenerator 4, then enter in heat exchanger.
Because organic working medium can be lossy in system, in order to maintain the normal circulation of organic working medium in system, need in system, to supplement organic working medium in time.As shown in Figure 1, on the basis of the above, be also connected with liquid container 6 between described condenser 5 and organic working medium recycle pump 7, described liquid container be provided with organic working medium supplementary device.Above-mentioned organic working medium supplementary device can be a valve, or is valvular straight tube of band etc.When needs supplement organic working medium in liquid container 6, can Open valve, in liquid container 6, supplement organic working medium, throttle down after supplementing.Certain above-mentioned organic working medium supplementary device can also comprise a liquid level detector, after the liquid level in liquid container 6 is lower than standard liquid level, liquid level detector is by Signal transmissions to control system, and control system by Open valve, and carries organic working medium by transport tube in liquid container 6.
Above-mentioned heat exchanger can use a single heat exchanger, also can be: described heat exchanger 1 comprises preheater 16 and the vaporizer 15 of series connection, the thermal source inlet 11 of described heat exchanger and heat exchanger organic working medium outlet 12 are all arranged on vaporizer 15, and thermal source outlet 13 and the heat exchanger organic working medium entrance 14 of heat exchanger are all arranged on preheater 16.Above-mentioned preheater 16 is identical with heat exchanger with the principle of vaporizer 15.In addition, BFU shell-and-tube heat exchanger selected by preheater, and BXM shell-and-tube heat exchanger selected by regenerator, solves Temperature cross-over problem, avoids reverse heat transfer.In preheater, regenerator, the outlet temperature of cold fluid is higher than the outlet temperature of hot fluid, therefore there will be Temperature cross-over.Preheater adopts the shell-and-tube heat exchanger of two-tube-pass double-shell side, and cold fluid and hot fluid flow process wherein, close to countercurrent flow, can be avoided occurring reverse heat transfer.In regenerator, heat exchanger shell adopts flow deviding type, and hot fluid is divided into some passages in the flowing of housing, and in each passage, hot fluid local temperature is all higher than cold fluid, there will not be reverse heat transfer.
Above-mentioned power take-off 2 can be a decompressor, is preferably: described power take-off 2 is ORC turbine.When power take-off 2 is ORC turbine, in order to prevent the organic working medium of its inside from leaking, corresponding sealing configuration can be set on ORC turbine.Sealing structure can comprise medium-tight, mechanical seal or by two kinds of conbined usage.Medium-tight namely by arranging corresponding sealing configuration, makes to be filled with a sealing in sealing configuration medium, and the pressure of sealing medium is greater than the pressure of the organic working medium of gaseous state, can prevent organic working medium from leaking like this.Mechanical seal to be fitted in the lower maintenance of elastic force (or magnetic force) effect of hydrodynamic pressure and compensation mechanism to the end face making relative sliding perpendicular to axle by a pair or several and is equipped with auxiliary seal and reaches the gland seal device of Drain Resistance.Above-mentioned mechanical seal and medium-tight are two kinds of common sealing means.Preferably both be applied on ORC turbine simultaneously and use as sealing configuration, sealing effect will be far longer than the effect of single sealing.Such as medium-tight can be set in the periphery of mechanical seal structure.
In use also can there is loss in conduction oil, simultaneously, the temperature fluctuation of the organic working medium in the continuous uniform heat exchanger of conduction oil flowing has a direct impact, and the temperature fluctuation of organic working medium can affect again the physical property of organic working medium, affects the normal work of organic working medium.Based on above-mentioned thinking, between the thermal source outlet 13 of described heat exchanger 1 and heat conduction oil circulating pump 100, be connected with oil storage tank 200.Oil storage tank 200 can arrange polytype oil-inlet mechanism.Such as can be a valve, can be oil inlet pipe and valve, can be oil inlet pipe and valve etc. with liquid level detector.By oil storage tank 200, the effect of buffering can be played on the one hand, ensure that conduction oil continues to circulate smoothly, thus ensure that the temperature of organic working medium in heat exchanger there will not be fluctuation, be conducive to protection organic working medium not because temperature fluctuation generation physical property changes; Conduction oil can be supplemented in time on the other hand.
On the basis of the above, in order to prevent the leakage of intrasystem organic working medium, system is in operation process, and the pressure of intrasystem organic working medium is more than or equal to its exterior pressure.Namely make the pressure of organic working medium be more than or equal to the pressure of external environment condition, the gas outside anti-locking system enters the physical property destroying organic working medium in system.Concrete, can select the organic working medium of suitable boiling point according to system, in such feasible system, the pressure of organic working medium is more than or equal to its exterior pressure.Such measure is the most favourable for condenser, can ensure that condenser runs under normal pressure or micro positive pressure condition, reduces condenser cost of investment.
Claims (6)
1. for the ORC power generation system of offshore platform, comprise the heat exchanger (1) be connected with thermal source, power take-off (2), the generator (3) be connected with the clutch end (22) of power take-off (2), organic working medium recycle pump (7), condenser (5), described heat exchanger (1) comprises thermal source inlet (11), thermal source outlet (13), heat exchanger organic working medium entrance (14) and heat exchanger organic working medium outlet (12), power take-off (2) comprises output unit organic working medium entrance (21) and output unit organic working medium outlet (23), heat exchanger organic working medium outlet (12) is connected with output unit organic working medium entrance (21), condenser (5) comprises condenser organic working medium entrance (51) and condenser organic working medium outlet (52), it is characterized in that:
Described thermal source comprises boiler (8), described boiler (8) comprises conduction oil entrance (84), conduction oil outlet (81), smoke inlet (82) and smoke outlet (83), oil duct is provided with between conduction oil entrance (84) and conduction oil outlet (81), the flue gas channel carrying out exchange heat for the conduction oil in flue gas and oil duct is provided with between smoke inlet (82) and smoke outlet (83), conduction oil outlet (81) of boiler (8) is connected with the thermal source inlet (11) of heat exchanger (1) by triethylene glycol reboiler (9), the thermal source outlet (13) of heat exchanger (1) is connected with the conduction oil entrance (84) of boiler (8) by heat conduction oil circulating pump (100),
Also comprise regenerator (4), first organic working medium entrance (41) of regenerator (4) and the first organic working medium export between (42) and are provided with the first heat exchange road, second organic working medium entrance (44) of regenerator (4) and the second organic working medium export between (43) and are provided with the second heat exchange road, first organic working medium entrance (41) of regenerator (4) exports (23) and is connected with output unit organic working medium, first organic working medium outlet (42) of regenerator (4) is connected with condenser organic working medium entrance (51), condenser organic working medium outlet (52) is connected with the second organic working medium entrance (44) of regenerator (4) by organic working medium recycle pump (7), second organic working medium outlet (43) of regenerator is connected with heat exchanger organic working medium entrance (14), described regenerator (4) is BXM shell-and-tube heat exchanger,
Liquid container (6) is also connected with between described condenser (5) and organic working medium recycle pump (7), described liquid container is provided with organic working medium supplementary device, described organic working medium supplementary device also comprises liquid level detector, control system, valve, and described control system is connected with valve with liquid level detector respectively;
Described heat exchanger (1) comprises preheater (16) and the vaporizer (15) of series connection, the thermal source inlet (11) of described heat exchanger and heat exchanger organic working medium outlet (12) are all arranged on vaporizer (15), the thermal source outlet (13) of heat exchanger and heat exchanger organic working medium entrance (14) are all arranged on preheater (16), and described preheater (16) is BFU shell-and-tube heat exchanger.
2., as claimed in claim 1 for the ORC power generation system of offshore platform, it is characterized in that: described power take-off (2) is ORC turbine, described ORC turbine is provided with the sealing configuration for preventing organic working medium from leaking.
3., as claimed in claim 1 for the ORC power generation system of offshore platform, it is characterized in that: between the thermal source outlet (13) of described heat exchanger (1) and heat conduction oil circulating pump (100), be connected with oil storage tank (200).
4. adopt the electricity-generating method of the ORC power generation system for offshore platform according to claim 1, it is characterized in that: the heat first making to enter the conduction oil absorption flue gas of boiler by boiler (8), then conduction oil is made to make the work of triethylene glycol reboiler through triethylene glycol reboiler (9), then conduction oil enters heat exchanger (1) and organic working medium in system is heated into gaseous state, and conduction oil enters boiler (8) by heat conduction oil circulating pump (100) after heat exchanger thermal source outlet flow goes out; Gaseous state organic working medium impels power take-off (2) acting drive electrical generators (3) generating, the organic working medium that power take-off (2) is discharged enters condenser (5) through regenerator (4) and is cooled to liquid state, liquid organic working medium forms supercooled liquid organic working medium through organic working medium recycle pump (7) pressurization, supercooled liquid organic working medium absorbs the heat of the gaseous state organic working medium in the first heat exchange road of regenerator (4) after entering the second heat exchange road of regenerator (4), then enter in heat exchanger;
Liquid container (6) is also connected with between described condenser (5) and organic working medium recycle pump (7), described liquid container is provided with organic working medium supplementary device, described organic working medium supplementary device also comprises liquid level detector, control system, valve, liquid level detector by Signal transmissions to control system, control system by Open valve, and supplements organic working medium by transport tube in liquid container (6);
Described heat exchanger (1) comprises preheater (16) and the vaporizer (15) of series connection, the thermal source inlet (11) of described heat exchanger and heat exchanger organic working medium outlet (12) are all arranged on vaporizer (15), the thermal source outlet (13) of heat exchanger and heat exchanger organic working medium entrance (14) are all arranged on preheater (16), and described preheater (16) is BFU shell-and-tube heat exchanger.
5. electricity-generating method as claimed in claim 4, is characterized in that: be connected with oil storage tank (200) between the thermal source outlet (13) of described heat exchanger and heat conduction oil circulating pump (100).
6. electricity-generating method as claimed in claim 4, is characterized in that: described power take-off (2) is ORC turbine, described ORC turbine is provided with the sealing configuration for preventing organic working medium from leaking.
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| CN103939215A (en) * | 2014-05-15 | 2014-07-23 | 中国船舶重工集团公司第七�三研究所 | Organic Rankin cycle generation device using residual heat of gas turbine |
| CN103953404A (en) * | 2014-05-15 | 2014-07-30 | 中国船舶重工集团公司第七�三研究所 | Organic Rankine cycle power generation device utilizing exhaust waste heat of gas turbine engine |
| CN104005803B (en) * | 2014-05-29 | 2015-10-07 | 金海重工股份有限公司 | A kind of ocean platform heat energy from waste gas recycle device |
| JP6170487B2 (en) * | 2014-12-22 | 2017-07-26 | 株式会社神戸製鋼所 | Thermal energy recovery device |
| CN106761984A (en) * | 2016-11-09 | 2017-05-31 | 中海石油(中国)有限公司 | A kind of skid-mounted afterheat generating system for offshore platform main electrical power plant |
| CN109709911B (en) * | 2018-12-11 | 2021-06-22 | 上海电力学院 | On-line measuring method and system for leakage of circulating working medium of thermal power generating unit |
| CN110953030A (en) * | 2019-11-19 | 2020-04-03 | 深圳市凯盛科技工程有限公司 | Method and device for generating electricity by using waste heat of glass kiln |
| CN113883028B (en) * | 2021-09-01 | 2023-09-22 | 南京弘旭热能科技有限公司 | Photo-thermal evaporation and waste heat preheating coupling power generation system |
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