CN219347031U - Device for purifying hydrogen-containing tail gas and preparing nitrogen-hydrogen mixed gas - Google Patents
Device for purifying hydrogen-containing tail gas and preparing nitrogen-hydrogen mixed gas Download PDFInfo
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- CN219347031U CN219347031U CN202320134807.9U CN202320134807U CN219347031U CN 219347031 U CN219347031 U CN 219347031U CN 202320134807 U CN202320134807 U CN 202320134807U CN 219347031 U CN219347031 U CN 219347031U
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 129
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 129
- 239000007789 gas Substances 0.000 title claims abstract description 114
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 77
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 172
- 239000007788 liquid Substances 0.000 claims abstract description 149
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 84
- 238000005406 washing Methods 0.000 claims abstract description 50
- 239000000446 fuel Substances 0.000 claims abstract description 41
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- 230000001502 supplementing effect Effects 0.000 claims description 8
- 229910021529 ammonia Inorganic materials 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- 239000002737 fuel gas Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000010992 reflux Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0276—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of H2/N2 mixtures, i.e. of ammonia synthesis gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
- F25J3/0219—Refinery gas, cracking gas, coke oven gas, gaseous mixtures containing aliphatic unsaturated CnHm or gaseous mixtures of undefined nature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/20—H2/N2 mixture, i.e. synthesis gas for or purge gas from ammonia synthesis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/42—Nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2245/00—Processes or apparatus involving steps for recycling of process streams
- F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/04—Internal refrigeration with work-producing gas expansion loop
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
- F25J2270/904—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by liquid or gaseous cryogen in an open loop
Abstract
The utility model relates to a device for purifying hydrogen-containing tail gas and preparing nitrogen-hydrogen mixed gas, which comprises a heat exchanger group, a liquid nitrogen washing tower, a gas-liquid separator and an expander, wherein the heat exchanger group is arranged on the bottom of the liquid nitrogen washing tower; the hydrogen-containing tail gas source is connected to the hydrogen-containing tail gas inlet of the liquid nitrogen washing tower through the heat exchanger group, the high-pressure nitrogen gas source is connected to the liquid nitrogen inlet of the liquid nitrogen washing tower through the heat exchanger group, the nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower is connected to the position where the nitrogen-hydrogen mixed gas is needed through the heat exchanger group, the mixed fuel liquid outlet of the liquid nitrogen washing tower is connected with the mixed fuel liquid inlet of the gas-liquid separator, the circulating hydrogen outlet of the gas-liquid separator is connected to the position where the liquid fuel is needed through the heat exchanger group, and the fuel liquid outlet of the gas-liquid separator is connected to the position where the hydrogen is needed through the heat exchanger group after passing through the heat exchanger group and the expansion machine in sequence. The utility model aims at purifying the tail gas containing hydrogen and preparing the mixed gas of nitrogen and hydrogen for use, thereby reducing the resource waste and increasing the benefit.
Description
Technical Field
The utility model relates to the technical field of tail gas treatment, in particular to a device for purifying hydrogen-containing tail gas and preparing nitrogen-hydrogen mixed gas.
Background
In the production process of synthetic ammonia, a tail gas with higher hydrogen content is discharged, wherein the hydrogen content is 93.9%, the nitrogen content is 3.5%, the carbon monoxide content is 1.5%, the methane content is 1%, and the oxygen content is 0.1%. At present, no treatment measures are taken for the hydrogen-containing tail gas, so that resource waste is caused.
Disclosure of Invention
The utility model aims to provide a device for purifying hydrogen-containing tail gas and preparing nitrogen-hydrogen mixed gas, which can reduce resource waste.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the device for purifying the hydrogen-containing tail gas and preparing the nitrogen-hydrogen mixed gas comprises a heat exchanger group, a liquid nitrogen washing tower, a gas-liquid separator and an expander, wherein the liquid nitrogen washing tower is used for obtaining the nitrogen-hydrogen mixed gas and mixed fuel liquid from the hydrogen-containing tail gas by utilizing liquid nitrogen, and the liquid nitrogen washing tower is provided with a hydrogen-containing tail gas inlet, a liquid nitrogen inlet, a nitrogen-hydrogen mixed gas outlet and a mixed fuel liquid outlet; the gas-liquid separator is provided with a mixed fuel liquid inlet, a circulating hydrogen outlet and a fuel liquid outlet;
the hydrogen-containing tail gas source is connected to the hydrogen-containing tail gas inlet of the liquid nitrogen washing tower through the heat exchanger group, the high-pressure nitrogen gas source is connected to the liquid nitrogen inlet of the liquid nitrogen washing tower through the heat exchanger group, the nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower is connected to the position where the nitrogen-hydrogen mixed gas is needed through the heat exchanger group, the mixed fuel liquid outlet of the liquid nitrogen washing tower is connected with the mixed fuel liquid inlet of the gas-liquid separator, the circulating hydrogen outlet of the gas-liquid separator is connected to the position where the liquid fuel is needed through the heat exchanger group, and the fuel liquid outlet of the gas-liquid separator is connected to the position where the hydrogen is needed through the heat exchanger group after passing through the heat exchanger group and the expansion machine in sequence.
The heat exchanger group comprises a first heat exchanger, a second heat exchanger and a third heat exchanger; the hydrogen-containing tail gas source sequentially passes through the first heat exchanger, the second heat exchanger and the third heat exchanger to be connected to the hydrogen-containing tail gas inlet of the liquid nitrogen washing tower, the nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower sequentially passes through the third heat exchanger, the second heat exchanger and the first heat exchanger to be connected to a place where nitrogen-hydrogen mixed gas is needed, the circulating hydrogen outlet of the gas-liquid separator sequentially passes through the third heat exchanger, the second heat exchanger and the first heat exchanger to be connected to a place where liquid fuel is needed, and the fuel liquid outlet of the gas-liquid separator sequentially passes through the third heat exchanger, the second heat exchanger, the expander, the second heat exchanger and the first heat exchanger to be connected to a place where hydrogen is needed.
The first heat exchanger, the second heat exchanger and the third heat exchanger are all plate-fin heat exchangers.
And a pipeline between the nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower and the position where the nitrogen-hydrogen mixed gas is needed is connected with a nitrogen distribution pipeline for inputting nitrogen to adjust the mixing proportion of the nitrogen-hydrogen mixed gas.
The nitrogen distribution pipeline is connected with a pipeline from the hydrogen-containing tail gas source to the hydrogen-containing tail gas inlet of the liquid nitrogen washing tower.
And a liquid nitrogen supplementing pipeline for supplementing the cold energy loss is also arranged in the heat exchanger group.
The heat exchanger group, the liquid nitrogen washing tower, the gas-liquid separator and the expander are all arranged in the cold box.
And the mixed fuel liquid outlet of the liquid nitrogen washing tower is connected with the mixed fuel liquid inlet of the gas-liquid separator through a throttling pressure reducing valve.
The hydrogen-containing tail gas source is an ammonia synthesis system, and a nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower is connected to the ammonia synthesis system through the heat exchanger group.
The circulating hydrogen outlet of the gas-liquid separator is connected to a gas recovery system or a raw material gas compression system through the heat exchanger group, and the fuel liquid outlet of the gas-liquid separator is connected to a fuel gas system through the heat exchanger group and the expander in sequence and then through the heat exchanger group.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the utility model aims at purifying the tail gas containing hydrogen and preparing the mixed gas of nitrogen and hydrogen for use, thereby reducing the resource waste and increasing the benefit.
Drawings
FIG. 1 is a schematic diagram of an apparatus for purifying a hydrogen-containing tail gas and preparing a nitrogen-hydrogen mixture according to the present utility model.
Description of the embodiments
The utility model will be further described with reference to examples of embodiments shown in the drawings.
Embodiment one: as shown in figure 1, the device for purifying the tail gas containing hydrogen and preparing the nitrogen-hydrogen mixed gas comprises a heat exchanger group, a liquid nitrogen washing tower, a gas-liquid separator and an expander, which are all arranged in a cold box.
The liquid nitrogen washing tower for obtaining the nitrogen-hydrogen mixed gas and the mixed fuel liquid from the hydrogen-containing tail gas by utilizing the liquid nitrogen is provided with a hydrogen-containing tail gas inlet, a liquid nitrogen inlet, a nitrogen-hydrogen mixed gas outlet and a mixed fuel liquid outlet. The gas-liquid separator has a mixed fuel liquid inlet, a recycle hydrogen outlet, and a fuel liquid outlet.
The hydrogen-containing tail gas source is connected to the hydrogen-containing tail gas inlet of the liquid nitrogen washing tower through the heat exchanger group, the high-pressure nitrogen gas source is connected to the liquid nitrogen inlet of the liquid nitrogen washing tower through the heat exchanger group, the nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower is connected to the position where the nitrogen-hydrogen mixed gas is needed through the heat exchanger group, the mixed fuel liquid outlet of the liquid nitrogen washing tower is connected with the mixed fuel liquid inlet of the gas-liquid separator through the throttle pressure reducing valve, the circulating hydrogen outlet of the gas-liquid separator is connected to the position where the liquid fuel is needed through the heat exchanger group, and the fuel liquid outlet of the gas-liquid separator is connected to the position where the hydrogen is needed through the heat exchanger group after passing through the heat exchanger group and the expansion machine in sequence.
The hydrogen-containing tail gas source is an ammonia synthesis system, and a nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower is connected to the ammonia synthesis system through a heat exchanger group. The circulating hydrogen outlet of the gas-liquid separator is connected to a gas recovery system or a raw material gas compression system through a heat exchanger group, and the fuel liquid outlet of the gas-liquid separator is connected to a fuel gas system through the heat exchanger group and an expander in sequence and then through the heat exchanger group.
In the above scheme, the heat exchanger group includes a first heat exchanger E1, a second heat exchanger E2, and a third heat exchanger E3, which may all adopt plate-fin heat exchangers. Then, the hydrogen-containing tail gas source is connected to the hydrogen-containing tail gas inlet of the liquid nitrogen washing tower sequentially through the first heat exchanger E1, the second heat exchanger E2 and the third heat exchanger E3, the nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower sequentially passes through the third heat exchanger E3, the second heat exchanger E2 and the first heat exchanger E1 and is connected to the position where the nitrogen-hydrogen mixed gas is needed, the circulating hydrogen outlet of the gas-liquid separator sequentially passes through the third heat exchanger E3, the second heat exchanger E2 and the first heat exchanger E1 and is connected to the position where the liquid fuel is needed, and the fuel liquid outlet of the gas-liquid separator sequentially passes through the third heat exchanger E3, the second heat exchanger E2, the expander, the second heat exchanger E2 and the first heat exchanger E1 and is connected to the position where the hydrogen is needed.
In addition, a nitrogen distribution pipeline for inputting nitrogen to adjust the mixing ratio of the nitrogen-hydrogen mixed gas is connected to a pipeline (between the third heat exchanger E3 and the second heat exchanger E2) between the nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower and a pipeline (between the second heat exchanger E2 and the third heat exchanger E3) between a hydrogen-containing tail gas source and a hydrogen-containing tail gas inlet of the liquid nitrogen washing tower. The heat exchanger group is also provided with a liquid nitrogen supplementing pipeline for supplementing cold energy loss, the liquid nitrogen supplementing pipeline sequentially passes through the third heat exchanger E3, the second heat exchanger E2 and the first heat exchanger E1, and liquid nitrogen in the liquid nitrogen supplementing pipeline becomes low-pressure nitrogen.
The tail gas purification method realized by the device for purifying and preparing the nitrogen-hydrogen mixed gas based on the hydrogen-containing tail gas comprises the following steps: the hydrogen-containing tail gas serving as raw material gas is dried and then sequentially sent to a first heat exchanger E1, a second heat exchanger E2 and a third heat exchanger E3, cooled to a certain temperature by the reflux gas and then enters the bottom of the liquid nitrogen washing tower. The high-pressure nitrogen is sequentially sent into the first heat exchanger E1, the second heat exchanger E2 and the third heat exchanger E3, cooled and liquefied by the reflux gas and then enters the top of the liquid nitrogen washing tower. The top of the liquid nitrogen washing tower is provided with a mixed gas containing nitrogen and hydrogen, wherein carbon monoxide, methane and oxygen are removed from the mixed gas; and (3) throttling and depressurizing the obtained liquid at the bottom of the liquid nitrogen washing tower through a valve, and then sending the liquid into a gas-liquid separator. The gas obtained from the top of the gas-liquid separator is heated to normal temperature in the third heat exchanger E3, the second heat exchanger E2 and the first heat exchanger E1 by the normal-flow gas, and then is sent to the recovery system. The liquid obtained at the bottom of the gas-liquid separator is throttled and depressurized by a valve, is heated to a certain temperature by the positive flow gas in the third heat exchanger E3 and the second heat exchanger E2, is sent into an expander for expansion and refrigeration, and the expanded gas is heated to normal temperature by the positive flow gas in the second heat exchanger E2 and the first heat exchanger E1 and is used as fuel gas. The nitrogen-hydrogen mixture gas obtained at the top of the liquid nitrogen washing column is heated to normal temperature by the normal flow gas in the third heat exchanger E3, the second heat exchanger E2 and the first heat exchanger E1 and then is sent out. On the high-pressure nitrogen line exiting the second heat exchanger E2, a certain amount of nitrogen is extracted and incorporated into the nitrogen-hydrogen mixture, so as to ensure that the ratio of the obtained nitrogen-hydrogen mixture is a desired ratio, for example 1:3. And a low-pressure liquid nitrogen is additionally arranged and is used as a reflux medium to be sent into the third heat exchanger E3, the second heat exchanger E2 and the first heat exchanger E1 so as to supplement the cooling capacity loss of the system.
The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.
Claims (10)
1. The utility model provides a device that contains hydrogen tail gas purification and prepares nitrogen hydrogen gas mixture which characterized in that: the device comprises a heat exchanger group, a liquid nitrogen washing tower, a gas-liquid separator and an expander, wherein the liquid nitrogen washing tower is used for obtaining nitrogen-hydrogen mixed gas and mixed fuel liquid from hydrogen-containing tail gas by utilizing liquid nitrogen, and the liquid nitrogen washing tower is provided with a hydrogen-containing tail gas inlet, a liquid nitrogen inlet, a nitrogen-hydrogen mixed gas outlet and a mixed fuel liquid outlet; the gas-liquid separator is provided with a mixed fuel liquid inlet, a circulating hydrogen outlet and a fuel liquid outlet;
the hydrogen-containing tail gas source is connected to the hydrogen-containing tail gas inlet of the liquid nitrogen washing tower through the heat exchanger group, the high-pressure nitrogen gas source is connected to the liquid nitrogen inlet of the liquid nitrogen washing tower through the heat exchanger group, the nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower is connected to the position where the nitrogen-hydrogen mixed gas is needed through the heat exchanger group, the mixed fuel liquid outlet of the liquid nitrogen washing tower is connected with the mixed fuel liquid inlet of the gas-liquid separator, the circulating hydrogen outlet of the gas-liquid separator is connected to the position where the liquid fuel is needed through the heat exchanger group, and the fuel liquid outlet of the gas-liquid separator is connected to the position where the hydrogen is needed through the heat exchanger group after passing through the heat exchanger group and the expansion machine in sequence.
2. The apparatus for purifying and preparing a nitrogen-hydrogen mixture from hydrogen-containing tail gas according to claim 1, wherein: the heat exchanger group comprises a first heat exchanger, a second heat exchanger and a third heat exchanger; the hydrogen-containing tail gas source sequentially passes through the first heat exchanger, the second heat exchanger and the third heat exchanger to be connected to the hydrogen-containing tail gas inlet of the liquid nitrogen washing tower, the nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower sequentially passes through the third heat exchanger, the second heat exchanger and the first heat exchanger to be connected to a place where nitrogen-hydrogen mixed gas is needed, the circulating hydrogen outlet of the gas-liquid separator sequentially passes through the third heat exchanger, the second heat exchanger and the first heat exchanger to be connected to a place where liquid fuel is needed, and the fuel liquid outlet of the gas-liquid separator sequentially passes through the third heat exchanger, the second heat exchanger, the expander, the second heat exchanger and the first heat exchanger to be connected to a place where hydrogen is needed.
3. The apparatus for purifying and preparing a nitrogen-hydrogen mixture from a hydrogen-containing tail gas according to claim 2, wherein: the first heat exchanger, the second heat exchanger and the third heat exchanger are all plate-fin heat exchangers.
4. The apparatus for purifying and preparing a nitrogen-hydrogen mixture from hydrogen-containing tail gas according to claim 1, wherein: and a pipeline between the nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower and the position where the nitrogen-hydrogen mixed gas is needed is connected with a nitrogen distribution pipeline for inputting nitrogen to adjust the mixing proportion of the nitrogen-hydrogen mixed gas.
5. The apparatus for purifying and preparing a nitrogen-hydrogen mixture from hydrogen-containing tail gas according to claim 4, wherein: the nitrogen distribution pipeline is connected with a pipeline from the hydrogen-containing tail gas source to the hydrogen-containing tail gas inlet of the liquid nitrogen washing tower.
6. The apparatus for purifying and preparing a nitrogen-hydrogen mixture from hydrogen-containing tail gas according to claim 1, wherein: and a liquid nitrogen supplementing pipeline for supplementing the cold energy loss is also arranged in the heat exchanger group.
7. The apparatus for purifying and preparing a nitrogen-hydrogen mixture from hydrogen-containing tail gas according to claim 1, wherein: the heat exchanger group, the liquid nitrogen washing tower, the gas-liquid separator and the expander are all arranged in the cold box.
8. The apparatus for purifying and preparing a nitrogen-hydrogen mixture from hydrogen-containing tail gas according to claim 1, wherein: and the mixed fuel liquid outlet of the liquid nitrogen washing tower is connected with the mixed fuel liquid inlet of the gas-liquid separator through a throttling pressure reducing valve.
9. The apparatus for purifying and preparing a nitrogen-hydrogen mixture from hydrogen-containing tail gas according to claim 1, wherein: the hydrogen-containing tail gas source is an ammonia synthesis system, and a nitrogen-hydrogen mixed gas outlet of the liquid nitrogen washing tower is connected to the ammonia synthesis system through the heat exchanger group.
10. The apparatus for purifying and preparing a nitrogen-hydrogen mixture from hydrogen-containing tail gas according to claim 1, wherein: the circulating hydrogen outlet of the gas-liquid separator is connected to a gas recovery system or a raw material gas compression system through the heat exchanger group, and the fuel liquid outlet of the gas-liquid separator is connected to a fuel gas system through the heat exchanger group and the expander in sequence and then through the heat exchanger group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320134807.9U CN219347031U (en) | 2023-02-07 | 2023-02-07 | Device for purifying hydrogen-containing tail gas and preparing nitrogen-hydrogen mixed gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320134807.9U CN219347031U (en) | 2023-02-07 | 2023-02-07 | Device for purifying hydrogen-containing tail gas and preparing nitrogen-hydrogen mixed gas |
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| CN219347031U true CN219347031U (en) | 2023-07-14 |
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| CN202320134807.9U Active CN219347031U (en) | 2023-02-07 | 2023-02-07 | Device for purifying hydrogen-containing tail gas and preparing nitrogen-hydrogen mixed gas |
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| Country | Link |
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| CN (1) | CN219347031U (en) |
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2023
- 2023-02-07 CN CN202320134807.9U patent/CN219347031U/en active Active
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