CN218561117U - Modularized natural gas reforming hydrogen production machine - Google Patents
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Abstract
The utility model discloses a modularized natural gas reforming hydrogen production machine, which belongs to the field of gas purification and separation, and comprises a batching module, a gas making module and a purification module which are arranged in sequence, wherein the batching module comprises a sleeve type reformer, a desulfurization tank, a heat exchange type middle conversion reactor, a winding type steam superheater, a boiler feed water preheater, a middle conversion water cooler and a middle conversion gas separator; the gas making module comprises a buffer tank, a compressor, a pre-desulfurizer and a boiler; the purification module comprises a pressure swing adsorption packaging grid. The volume of the engineering device is reduced, the occupied area of the engineering is reduced, the natural gas hydrogen production device is highly integrated and modularized, and a hydrogen source is specially provided for a hydrogenation station.
Description
Technical Field
The utility model belongs to the field of gas purification and separation, which is used for purifying hydrogen in the hydrogen production process, in particular to a modularized natural gas reforming hydrogen production machine.
Background
Hydrogen is a conventional production raw material and is used in large quantities as a coolant, a reducing agent, and the like. In chemical industry, the proportion of hydrogen production by natural gas is gradually increased, and the scale of the hydrogen production is larger and is more than 1000-20000 m 3 The range of/h. With the proposal of green energy, zero-emission hydrogen is increasingly paid attention by the world. The energy source bureau of China officially puts hydrogen energy in, the main range of the hydrogen energy is hydrogen fuel cells, a hydrogen station is taken as a fuel supply station of a fuel cell automobile, the hydrogen station is one of key factors for realizing commercialization of the fuel cell automobile, the construction of the hydrogen station is a development focus, and the demand of hydrogen is in a distributed development trend. According to market feedback, the proper demand of the hydrogenation station is 500-1000 Kg/d (200-500 Nm/d) 3 Around/h).
At present, the hydrogen source of a hydrogen filling station mainly depends on transportation at home, and the hydrogen storage and transportation by a high-pressure long-tube trailer is the mainstream in the industry. The hydrogen storage and transportation area does not produce hydrogen, and the hydrogen storage and transportation cost is high, so that the hydrogen storage and transportation is the place which currently restricts the development of hydrogen energy in China to be 'neck'. In the aspect of pipeline transportation, due to large initial investment, the current domestic related standard system is not complete, the safety technical problem of the pipeline girth weld in the hydrogen environment is still researched, and the hydrogen pipeline transportation is not developed in scale.
The hydrogen production by reforming natural gas faces the trend of miniaturization, and in view of the trend, the application provides a modularized hydrogen production machine by reforming natural gas.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an: need hydrogen need to adopt high-pressure long tube trailer warehousing and transportation hydrogen to above-mentioned phenomenon small-scale, the hydrogen warehousing and transportation cost that leads to is high problem not down, the utility model provides a modularization natural gas reforming hydrogen manufacturing machine reduces the engineering device volume, reduces engineering area, with the high integrated modularization of natural gas hydrogen manufacturing device, provides the hydrogen source to the supporting hydrogenation station specially.
The utility model adopts the technical scheme as follows:
a modularized natural gas reforming hydrogen production machine comprises a batching module, a gas making module and a purification module which are sequentially arranged, wherein the batching module comprises a sleeve type reformer, a desulfurization tank, a heat exchange type intermediate conversion reactor, a winding type steam superheater, a boiler feed water preheater, an intermediate conversion water cooler and an intermediate conversion gas separator; a steam generator and a natural gas preheating coil are arranged in the convection section of the sleeve type reformer from a high-temperature section to a low-temperature section; the outlet of the natural gas preheating coil is communicated with the inlet of the shift reactor in the heat exchange type through a pipeline, the top outlet of the shift reactor in the heat exchange type is communicated with a desulfurization tank through a pipeline, the desulfurization tank is communicated with a mixer through a pipeline, the mixer is communicated with the top inlet of the wound steam superheater through a pipeline, and the bottom outlet of the wound steam superheater is communicated with the inlet of the sleeve-type reforming furnace through an upper gas collecting main pipe and an upper pigtail pipe in sequence; an outlet of the sleeve type reforming furnace is communicated with a bottom inlet of the wound steam superheater through a pipeline, a top outlet of the wound steam superheater is communicated with a top inlet of the heat exchange type intermediate shift reactor, a bottom outlet of the heat exchange type intermediate shift reactor is communicated with a boiler feed water preheater, the boiler feed water preheater is communicated with an intermediate shift water cooler through a pipeline, and the intermediate shift water cooler is communicated with an intermediate shift gas separator through a pipeline; the outlet of the steam generator is communicated with a steam drum through a pipeline, and the steam drum is communicated with the mixer through a pipeline; the inlet of the steam generator is communicated with a boiler feed water preheater through a pipeline; a heating device is fixedly arranged on the sleeve type reforming furnace.
Preferably, the heating device comprises a burner fixedly arranged on the sleeve type reformer, an induced draft fan and a chimney; the combustor is connected with an air preheater, an air blower and an induced draft fan in sequence.
Preferably, the telescopic reformer is provided with a blow-down pipe.
Preferably, the gas making module comprises a buffer tank, a compressor, a pre-desulfurizer and a boiler; the outlet of the buffer tank is communicated with the raw material compressor through a pipeline, the raw material compressor is communicated with the pre-desulfurizer through a pipeline, and the pre-desulfurizer is communicated with the natural gas preheating coil through a pipeline; the boiler is connected with a feed pump, and the water outlet end of the feed pump is connected with a boiler feed water preheater; the compressor is connected with a compressor cooler.
Preferably, the purification module comprises a pressure swing adsorption container grid, and the pressure swing adsorption container grid is connected with the medium and variable gas separator through a valve.
A method for producing hydrogen by a modular natural gas reforming hydrogen production machine comprises the following steps:
step 1: preheating and desulfurizing: the natural gas enters a buffer tank after being boosted by a compressor, enters a natural gas preheating coil of a convection section of a sleeve type converter after being adjusted in quantity by a flow regulator, is preheated to 200 +/-5 ℃, then enters a desulfurization tank after being subjected to heat exchange to 400 +/-5 ℃ by a heat exchange type middle-conversion reactor, and the sulfur content in the natural gas is reduced to be below 0.1 PPm;
step 2: and (3) heating after mixing: process steam and natural gas according to H 2 O/S C =3.5 +/-0.5 to obtain mixed gas, the mixed gas enters a winding type steam superheater to exchange heat with the reformed gas at 780 +/-5 ℃, the mixed gas is superheated to 590 +/-5 ℃, and the superheated gas passes through an upper gas collecting header pipe and an upper pigtail pipe and enters a sleeve type reforming furnace pipe;
and 3, step 3: catalytic conversion by a converter: the mixed gas reacts in a catalyst layer of a sleeve type converter tube to produce CO and H at the temperature of 780 +/-5 DEG C 2 Until the content of residual methane is 3.0 +/-0.5 percent, obtaining converted gas;
and 4, step 4: primary cooling: the reformed gas is discharged from the sleeve type reformer, enters the winding type steam superheater to exchange heat with the mixed gas, and the temperature of the reformed gas discharged from the winding type steam superheater is reduced to 380 +/-5 ℃;
and 5: and (3) re-catalytic conversion: the reformed gas at 380 plus or minus 5 ℃ enters a heat exchange type shift reactor to convert CO and water vapor into CO 2 And hydrogen to obtain a shift gas;
step 6: secondary cooling: the shift gas out of the shift reactor in the heat exchange type enters a boiler feed water preheater and is further reduced to 150 +/-5 ℃;
and 7: and (3) cooling for the third time: cooling to 40 +/-5 ℃ after passing through an intermediate variable water cooler, separating a process condensate in an intermediate variable gas separator, discharging the process condensate out of the medium variable gas separator, and conveying the process condensate to a pressure swing adsorption packaging grid, wherein the process gas pressure at the outlet of the intermediate variable gas separator is 1.4 MPa;
and 8: purification: purifying the hydrogen by a pressure swing adsorption packaging grid to obtain pure hydrogen.
Further, the burner provides heat through the tube-in-tube reformer through natural gas and tail gas from the pressure swing adsorption unit.
Further, the process steam is generated by a steam generation unit, and the steam generation unit comprises desalted water, a boiler, a feed water pump, a boiler feed water preheater, a steam generator and a steam drum.
The sleeve type reformer structure adopted by the utility model is named as a sleeve type multi-pass conversion composite hydrogen production reformer with the patent number of 2020228086606, which is described in detail and is not expanded; the utility model discloses a coiled tube type steam generator, which is named as a coiled tube type steam generator for small-sized natural gas hydrogen production conversion, and the patent number 2020228106065 has detailed description and is not expanded; the utility model discloses a heat exchange type shift reactor, which is named as a reformed gas heat exchange type shift reactor under the patent number of 2020228081119 and has detailed description, and the description is not expanded; the utility model discloses a pressure swing adsorption collection dress check of adoption is called a collection dress check that is used for pressure swing adsorption in the patent name, and the patent number is 2020229002716 has detailed description, no longer expandes the description.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) The utility model discloses an adopt batching module, gas making module, purification module, solve the difficult problem that needs hydrogen on a small scale, and realize the better step of the energy and use, raise the efficiency, through preheating desulfurization, mix the back reheat, reformer catalytic conversion, once cool down, the process steps of secondary cooling hydrogen manufacturing promptly, adopt the process steam generation of reformed gas to the feed gas and to the heating of natural gas, realized that the thermal step is used in the reformed gas.
(2) The utility model discloses on combining the four items that have obtained the mandate to traditional natural gas hydrogen manufacturing integrated the part basis, will batching module, make each part in the gas module, the purification module organic integration, effectively reduce the engineering device volume once more, reduce engineering area, with the high integrated modularization of traditional natural gas hydrogen manufacturing installation, be specially to providing the hydrogen source for the hydrogenation station is supporting to realize that the modularization is made, the transportation, after arriving the scene, can realize putting into production through simple equipment.
(3) The utility model discloses with the high integration of steam generator in the furnace body, effectively reduced the volume and the area of device to reduce corollary equipment and pipeline investment, each submodule piece can be assembling in equipping the workshop simultaneously, improves and equips precision and speed.
Drawings
FIG. 1 is a schematic flow diagram of a modular natural gas hydrogen production process of the present invention;
FIG. 2 is a schematic flow diagram of a conventional natural gas hydrogen production process of the present invention;
fig. 3 is a side view of the gas generating module of the present invention;
FIG. 4 is a side view of the gas generation module and purification module of the present invention;
fig. 5 is a top view of the gas generating module and the purification module of the present invention.
Labeled in the figure as: the system comprises a 1-sleeve type reforming furnace, a 2-desulfurization tank, a 3-heat exchange type intermediate shift reactor, a 4-winding type steam superheater, a 5-boiler feed water preheater, a 6-intermediate shift water cooler, a 7-intermediate shift gas separator, an 8-steam generator, a 9-natural gas preheating coil, a 10-steam drum, a 11-combustor, a 12-air preheater, a 13-air blower, a 14-air guide device, a 15-air guide device, a 16-chimney, a 17-blow-down pipe, an 18-buffer tank, a 19-compressor, a 20-pre-desulfurizer, a 21-boiler, a 22-water feed pump, a 23-pressure swing adsorption packaging grid, a 24-valve and a 25-compressor cooler.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention.
Example 1
As shown in fig. 1 and 3-5, a modular natural gas reforming hydrogen production machine comprises a batching module, a gas production module and a purification module which are arranged in sequence, wherein the batching module comprises a sleeve type converter 1, a desulfurization tank 2, a heat exchange type intermediate shift reactor 3, a winding type steam superheater 4, a boiler 21 feed water preheater 5, an intermediate shift water cooler 6 and an intermediate shift gas separator 7; a steam generator 8 and a natural gas preheating coil 9 are arranged in the convection section of the sleeve-type converter 1 from a high-temperature section to a low-temperature section; the outlet of the natural gas preheating coil 9 is communicated with the inlet of the shift reactor 3 in the heat exchange type through a pipeline, the outlet at the top of the shift reactor 3 in the heat exchange type is communicated with the desulfurizing tank 2 through a pipeline, the desulfurizing tank 2 is communicated with the mixer through a pipeline, the mixer is communicated with the inlet at the top of the winding type steam superheater 4 through a pipeline, and the outlet at the bottom of the winding type steam superheater 4 is communicated with the inlet of the sleeve type reformer 1 through an upper gas collecting main pipe and an upper pigtail pipe in sequence; an outlet of the sleeve type conversion furnace 1 is communicated with a bottom inlet of a winding type steam superheater 4 through a pipeline, a top outlet of the winding type steam superheater 4 is communicated with a top inlet of a conversion reactor 3 in the heat exchange type, a bottom outlet of the conversion reactor 3 in the heat exchange type is communicated with a feed water preheater 5 of a boiler 21, the feed water preheater 5 of the boiler 21 is communicated with a middle shift water cooler 6 through a pipeline, and the middle shift water cooler 6 is communicated with a middle shift gas separator 7 through a pipeline; the outlet of the steam generator 8 is communicated with a steam drum 10 through a pipeline, and the steam drum 10 is communicated with the mixer through a pipeline; the inlet of the steam generator 8 is communicated with the feed water preheater 5 of the boiler 21 through a pipeline; the sleeve type reformer 1 is fixedly provided with a heating device.
Wherein, the heating device comprises a burner 11 fixedly arranged on the sleeve type reformer 1, an induced draft fan 15 and a chimney 16; the combustor 11 is connected with an air preheater 12, a blower 13 and an induced draft fan 15 in sequence. The sleeve type reformer 1 is provided with a vent pipe 17.
The gas making module comprises a buffer tank 18, a compressor 19, a pre-desulfurizer 20 and a boiler 21; the outlet of the buffer tank 18 is communicated with a raw material compressor 19 through a pipeline, the raw material compressor 19 is communicated with a pre-desulfurizer 20 through a pipeline, and the pre-desulfurizer 20 is communicated with the natural gas preheating coil 9 through a pipeline; the boiler 21 is connected with a feed water pump 22, and the water outlet end of the feed water pump 22 is connected with a feed water preheater 5 of the boiler 21; a compressor 19 cooler is connected to the compressor 19.
The purification module comprises a pressure swing adsorption container grid 23, and the pressure swing adsorption container grid 23 is connected with the medium and variable gas separator 7 through a valve 24.
The utility model discloses on combining the four items that have obtained the mandate to traditional natural gas hydrogen manufacturing integrated the part basis, will batching module, make each part in the gas module, the purification module organic integration, effectively reduce the engineering device volume once more, reduce engineering area, with the high integrated modularization of traditional natural gas hydrogen manufacturing installation, be specially to providing the hydrogen source for the hydrogenation station is supporting to realize that the modularization is made, the transportation, after arriving the scene, can realize putting into production through simple equipment.
Example 2
The utility model discloses a method for producing hydrogen of a modularized natural gas reforming hydrogen production machine, as shown in figure 1, comprising the following steps:
step 1: preheating and desulfurizing: the natural gas enters a buffer tank 18 after being boosted by a compressor 19, enters a natural gas preheating coil 9 of a convection section of a sleeve type converter 1 after being regulated by a flow regulator to be preheated to 200 ℃, then enters a desulfurization tank 2 after being subjected to heat exchange to 400 ℃ by a heat exchange type middle conversion reactor 3, so that the sulfur content in the natural gas is reduced to be below 0.1 PPm;
step 2: and (3) heating after mixing: mixing process steam and natural gas according to H2O/sigma C =3.5 to obtain mixed gas, introducing the mixed gas into a wound steam superheater 4 to exchange heat with reformed gas at 780 ℃, superheating to 590 ℃, introducing the superheated gas into a sleeve type reformer 1 through an upper gas collecting main pipe and an upper pig tail pipe;
and step 3: catalytic conversion by a converter: at 780 deg.C, the mixed gas is in the catalyst layer of sleeve type reformer 1 tubeIn the method, the mixed gas is reacted to produce CO and H 2 Until the content of residual methane is 3.0 percent, obtaining converted gas;
and 4, step 4: primary cooling: the reformed gas is discharged from the sleeve type reformer 1, enters the wound steam superheater 4 to exchange heat with the mixed gas, and the temperature of the reformed gas discharged from the wound steam superheater 4 is reduced to 380 ℃;
and 5: and (3) re-catalytic conversion: the reformed gas at 380 ℃ enters a heat exchange type shift reactor 3 to convert CO and water vapor into CO 2 And hydrogen to obtain a shift gas;
step 6: secondary cooling: the shift gas out of the shift reactor 3 in the heat exchange type enters a boiler 21 and a feed water preheater 5, and is further reduced to 150 ℃;
and 7: and (3) cooling for the third time: the process gas is cooled to 40 ℃ after passing through an intermediate pressure change water cooler 6, enters an intermediate pressure change gas separator 7 to separate process condensate, is discharged out of the boundary, has the pressure of 1.4MPa at the outlet of the intermediate pressure change gas separator 7 and is sent to a pressure swing adsorption packaging grid 23;
and 8: purification and purification: purified by pressure swing adsorption packing grid 23 to obtain pure hydrogen.
Wherein the burner 11 provides heat through the tube-in-tube reformer 1 by natural gas and tail gas from the pressure swing adsorption unit 23. The process steam is generated by a steam generation unit comprising desalted water, a boiler 21, a feed water pump 22, a boiler 21 feed water preheater 5, a steam generator 8 and a steam drum 10.
The air preheating uses a shaping air preheater 12.
The utility model discloses an adopt batching module, gas making module, purification module, solve the difficult problem that needs hydrogen on a small scale, and realize the better step of the energy and use, raise the efficiency, through preheating desulfurization, mix the back reheat, reformer catalytic conversion, once cool down, the process steps of secondary cooling hydrogen manufacturing promptly, adopt the process steam generation of reformed gas to the feed gas and to the heating of natural gas, realized that the thermal step is used in the reformed gas.
Example 3
The typical flow of the traditional natural gas is as follows: as shown in fig. 2, the natural gas is pressurized by the compressor and then fed to the natural gas compressorThe raw material gas enters a raw material gas buffer tank, enters a raw material gas preheating coil of a convection section of a converter after being regulated by a flow regulator, is preheated to about 400 ℃, and enters a desulfurization tank, so that the sulfur content in the raw material gas is reduced to below 0.1 PPm. The desulfurized feed gas and process steam are mixed according to H 2 Mixing O/S C =3.5 (automatic ratio adjustment), preheating to 590 deg.C, introducing into a converter tube via an upper gas collecting main pipe and a pig tail pipe, and reacting methane with steam in a catalyst layer to produce CO and H 2 . The heat required for methane reforming is provided by burning a fuel mixture with a top burner. The reformed gas exits the reformer at about 780 ℃ and has a residual methane content of about 3.0% (dry basis) and enters the high-temperature end tube pass of the waste heat boiler. The waste heat boiler generates saturated steam with 2.0MPa (G), the temperature of converted gas out of the waste heat boiler is reduced to 380 ℃, and the converted gas enters the reactor with the temperature being changed, so that CO and water vapor are converted into CO2 and hydrogen. The converted gas from the middle-variable reactor enters a low-temperature end tube pass of a waste heat boiler for heat exchange, then enters a boiler water supply preheater, is further cooled to 150 ℃, is cooled to 40 ℃ after passing through a middle-variable water cooler, enters a middle-variable gas separator, is separated out of process condensate, and is discharged outside. The pressure of the process gas at the outlet of the medium-pressure gas separator is about 1.4MPa (G), and the process gas is sent to a pressure swing adsorption device.
In order to recover the heat of the flue gas, six groups of heat exchange coil pipes are arranged in the convection section of the converter: (from high temperature stage to Low temperature stage)
a. Preheating coil pipe for steam-raw material mixed gas
b. Natural gas preheating coil pipe II
c. Steam superheater
d. Flue gas steam generator
e. Natural gas preheating coil pipe I
f. Air preheating coil pipe
Desalted water from a battery compartment is sent to a dosing device and a desalted water buffer tank, then is pumped by a boiler feed water pump to a boiler feed water preheater to be preheated to 180 ℃ and then enters a steam drum, one part of a liquid phase passes through a convection section flue gas steam generator of a reformer to exchange heat with flue gas of the convection section, the other part of the liquid phase exchanges heat with a reformed gas waste heat boiler, natural circulation is adopted for heat exchange, and part of boiler water is gasified and then is sent to a steam separator. Phosphate is added into the desalted water sent to the dosing device, and the desalted water is pumped to an outlet pipeline of a boiler water supply pump by a reciprocating pump of the dosing device, so that the scaling condition of the waste heat boiler is reduced. And metering steam generated after heat recovery by a steam superheater, mixing the steam with natural gas in proportion, and feeding the steam into a mixed gas preheater of the reforming furnace.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (5)
1. A modularized natural gas reforming hydrogen production machine is characterized by comprising a batching module, a gas making module and a purification module which are sequentially arranged, wherein the batching module comprises a sleeve type converter (1), a desulfurization tank (2), a heat exchange type middle conversion reactor (3), a winding type steam superheater (4), a boiler (21) feed water preheater (5), a middle conversion water cooler (6) and a middle conversion gas separator (7); a steam generator (8) and a natural gas preheating coil (9) are arranged in a convection section of the sleeve-type reformer (1) from a high-temperature section to a low-temperature section; an outlet of the natural gas preheating coil (9) is communicated with an inlet of the heat exchange type medium shift reactor (3) through a pipeline, a top outlet of the heat exchange type medium shift reactor (3) is communicated with the desulfurization tank (2) through a pipeline, the desulfurization tank (2) is communicated with the mixer through a pipeline, the mixer is communicated with a top inlet of the wound steam superheater (4) through a pipeline, and a bottom outlet of the wound steam superheater (4) is communicated with an inlet of the sleeve type reformer (1) through an upper gas collecting header pipe and an upper pigtail pipe in sequence; an outlet of the sleeve type conversion furnace (1) is communicated with a bottom inlet of the wound steam superheater (4) through a pipeline, a top outlet of the wound steam superheater (4) is communicated with a top inlet of the heat exchange type intermediate shift reactor (3), a bottom outlet of the heat exchange type intermediate shift reactor (3) is communicated with a feed water preheater (5) of a boiler (21), the feed water preheater (5) of the boiler (21) is communicated with an intermediate shift water cooler (6) through a pipeline, and the intermediate shift water cooler (6) is communicated with an intermediate shift gas separator (7) through a pipeline; the outlet of the steam generator (8) is communicated with a steam drum (10) through a pipeline, and the steam drum (10) is communicated with the mixer through a pipeline; the inlet of the steam generator (8) is communicated with a feed water preheater (5) of the boiler (21) through a pipeline; a heating device is fixedly arranged on the sleeve type conversion furnace (1).
2. The modular natural gas reforming hydrogen production machine according to claim 1, wherein the heating device comprises a burner (11) fixedly arranged on the sleeve-type reformer (1), an induced draft fan (15) and a chimney (16); the combustor (11) is connected with an air preheater (12), an air blower (13) and an induced draft fan (15) in sequence.
3. The modular natural gas reforming hydrogen production machine according to claim 1, characterized in that a blow-down pipe (17) is arranged on the sleeve-type reformer (1).
4. The modular natural gas reforming hydrogen production machine according to claim 1, wherein the gas making module comprises a buffer tank (18), a compressor (19), a pre-desulfurizer (20) and a boiler (21); an outlet of the buffer tank (18) is communicated with a raw material compressor (19) through a pipeline, the raw material compressor (19) is communicated with a pre-desulfurizer (20) through a pipeline, and the pre-desulfurizer (20) is communicated with the natural gas preheating coil (9) through a pipeline; the boiler (21) is connected with a feed pump (22), and the water outlet end of the feed pump (22) is connected with a feed water preheater (5) of the boiler (21); the compressor (19) is connected with a compressor (19) cooler.
5. The modular natural gas reforming hydrogen production machine according to claim 1, wherein the purification module comprises a pressure swing adsorption packaging grid (23), and the pressure swing adsorption packaging grid (23) is connected with the medium-variable gas separator (7) through a valve (24).
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