CN217612995U - System for preparing high-purity methane, high-purity ethane and high-purity propane from natural gas - Google Patents
System for preparing high-purity methane, high-purity ethane and high-purity propane from natural gas Download PDFInfo
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- CN217612995U CN217612995U CN202221834815.6U CN202221834815U CN217612995U CN 217612995 U CN217612995 U CN 217612995U CN 202221834815 U CN202221834815 U CN 202221834815U CN 217612995 U CN217612995 U CN 217612995U
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Abstract
The utility model discloses a system for by natural gas preparation high-purity methane, high-purity ethane and high-purity propane, including liquefied natural gas head tank, vaporization unit, fine desulphurization unit, temperature swing adsorption dehydration decarbonization unit, propane separation rectification unit, ethane separation rectification unit and methane separation rectification unit, liquefied natural gas head tank with through the pipeline intercommunication between the vaporization unit, the vaporization unit with through the pipeline intercommunication between the fine desulphurization unit, fine desulphurization unit with through the pipeline intercommunication between the temperature swing adsorption dehydration decarbonization unit, temperature swing adsorption dehydration decarbonization unit with through the pipeline intercommunication between the propane separation rectification unit, propane separation rectification unit with through the pipeline intercommunication between the ethane separation rectification unit, ethane separation rectification unit with through the pipeline intercommunication between the methane separation rectification unit, the utility model discloses use the liquefied natural gas as the raw materials, prepare out high-purity methane, high-purity ethane and high-purity propane.
Description
Technical Field
The utility model belongs to high-purity electron special gas preparation field, concretely relates to system for preparing high-purity methane, high-purity ethane and high-purity propane by the natural gas.
Background
The natural gas is mainly used as fuel, can be used for producing carbon black, chemicals and liquefied petroleum gas, and the propane and butane produced by the natural gas are important raw materials of modern industry. Natural gas consists mainly of gaseous low molecular hydrocarbons and a mixture of non-hydrocarbon gases, which consist mainly of methane (85%) and small amounts of ethane (9%), propane (3%), nitrogen (2%) and butane (1%).
Natural gas is a bulk material, wherein methane, ethane, propane and the like can be used as a source of electronic special gas of high-purity methane, high-purity ethane and high-purity propane, wherein the high-purity methane and the high-purity ethane can be used as carbon sources for semiconductor vapor deposition, and the high-purity propane can be used as silicon carbide epitaxial growth gas of a third-generation semiconductor. However, at present, most of high-purity gas in China is imported, and a device for directly preparing high-purity methane, high-purity ethane and high-purity propane from natural gas is lacked.
In view of the above, it is necessary to provide a system for directly producing high purity methane, high purity ethane and high purity propane from natural gas to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a system by high-purity methane of natural gas preparation, high-purity ethane and high-purity propane, the system uses liquefied natural gas as the raw materials, prepares out high-purity methane, high-purity ethane and high-purity propane through purification, multistage rectification, and simultaneously, the accessory substance after the purification also can utilize, and this system energy consumption is lower, and device economic benefits is bigger.
For solving the above-mentioned problem that exists among the prior art, the utility model discloses a realize through following technical scheme:
a system for preparing high-purity methane, high-purity ethane and high-purity propane from natural gas comprises a liquefied natural gas raw material tank, a vaporization unit, a fine desulfurization unit, a temperature swing adsorption dehydration decarburization unit, a propane separation and rectification unit, an ethane separation and rectification unit and a methane separation and rectification unit, wherein the liquefied natural gas raw material tank is communicated with the vaporization unit through a pipeline, the vaporization unit is communicated with the fine desulfurization unit through a pipeline, the fine desulfurization unit is communicated with the temperature swing adsorption dehydration decarburization unit through a pipeline, the temperature swing adsorption dehydration decarburization unit is communicated with the propane separation and rectification unit through a pipeline, the propane separation and rectification unit is communicated with the ethane separation and rectification unit through a pipeline, and the ethane separation and rectification unit is communicated with the methane separation and rectification unit through a pipeline.
Furthermore, the propane separation and rectification unit comprises a propane rectification tower and a propane separation tower which are sequentially arranged, the temperature swing adsorption dehydration decarburization unit is communicated with the propane rectification tower through a pipeline, industrial propane at the bottom of the propane separation tower is filled through an outlet pipeline at the bottom of the propane separation tower, and high-purity propane at the bottom of the propane rectification tower is filled through an outlet pipeline at the bottom of the propane rectification tower.
Further, the ethane separation and rectification unit comprises an ethane rectification tower and an ethane separation tower which are sequentially arranged, the propane separation and rectification unit is communicated with the ethane rectification tower through a pipeline, industrial ethane at the bottom of the ethane separation tower is filled through an outlet pipeline at the bottom of the ethane separation tower, high-purity ethane at the bottom of the ethane rectification tower is filled through an outlet pipeline at the bottom of the ethane rectification tower, and the outlet pipeline at the bottom of the ethane rectification tower is communicated with the temperature swing adsorption, dehydration and decarbonization unit through a pipeline.
Furthermore, the methane separation and rectification unit comprises a methane rectification tower and a methane separation tower which are sequentially arranged, the ethane separation and rectification unit is communicated with the methane rectification tower through a pipeline, industrial methane at the bottom of the methane separation tower is filled through an outlet pipeline at the bottom of the methane separation tower, and high-purity methane at the bottom of the methane rectification tower is filled through an outlet pipeline at the bottom of the methane rectification tower.
Further, the system still includes main heat transfer unit, cold box unit and natural gas line, and the thick propane warp at propane separation rectification unit top the outlet pipeline at propane separation rectification unit top with natural gas line intercommunication, the thick ethane warp at ethane separation rectification unit top the outlet pipeline at ethane separation rectification unit top with natural gas line intercommunication, the thick methane warp at methane separation rectification unit top the outlet pipeline at methane separation rectification unit top with natural gas line intercommunication, the top of temperature swing adsorption dehydration decarbonization unit with natural gas line passes through the pipeline intercommunication, the top of head tank with natural gas line passes through the pipeline intercommunication.
Further, the main heat exchange unit, the propane separation and rectification unit, the ethane separation and rectification unit and the methane separation and rectification unit are arranged inside the cold box unit, and pipelines between the temperature swing adsorption, dehydration and decarbonization unit and the propane separation and rectification unit pass through the main heat exchange unit, outlet pipelines of the propane separation and rectification unit, the ethane separation and rectification unit and the methane separation and rectification unit and pass through the main heat exchange unit.
Compared with the prior art, the utility model has the advantages of as follows:
the utility model discloses in to liquefied natural gas is the raw materials, through vaporization unit vaporization back, gets into the desulfurization unit desulfurization that becomes essence, then gets into temperature swing adsorption dehydration decarbonization unit dehydration decarbonization, at last through propane separation rectification unit, ethane separation rectification unit and methane separation rectification unit carry out the rectification, prepare out high-purity methane, high-purity ethane and high-purity propane, simultaneously, the accessory substance after the purification also can utilize, this system energy consumption is lower, device economic benefits is bigger.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a system for producing high purity methane, high purity ethane and high purity propane from natural gas according to the present invention;
the reference numerals in the figures mean: 1: a liquefied natural gas feed tank; 2: a vaporization unit; 3: a fine desulfurization unit; 4: a temperature swing adsorption dehydration decarburization unit; 5: a propane separation and rectification unit; 51: a propane rectification column; 52: a propane separation column; 6: an ethane separation rectification unit; 61: an ethane rectification column; 62: an ethane separation column; 7: a methane separation and rectification unit; 71: a methane rectification column; 72: a methane separation column; 8: a main heat exchange unit; 9: a cold box unit; 10: a natural gas pipeline.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Moreover, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "disposed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
Referring to fig. 1, a system for producing high purity methane, high purity ethane and high purity propane from natural gas comprises a liquefied natural gas feed tank 1, a vaporization unit 2, a fine desulfurization unit 3, a temperature swing adsorption dehydration and decarbonization unit 4, a propane separation and rectification unit 5, an ethane separation and rectification unit 6 and a methane separation and rectification unit 7, wherein the liquefied natural gas feed tank 1 is communicated with the vaporization unit 2 through a pipeline, the vaporization unit 2 is communicated with the fine desulfurization unit 3 through a pipeline, the fine desulfurization unit 3 is communicated with the temperature swing adsorption dehydration and decarbonization unit 4 through a pipeline, the temperature swing adsorption dehydration and decarbonization unit 4 is communicated with the propane separation and rectification unit 5 through a pipeline, the propane separation and rectification unit 5 is communicated with the ethane separation and rectification unit 6 through a pipeline, and the ethane separation and rectification unit 6 is communicated with the methane separation and rectification unit 7 through a pipeline.
Specifically, liquefied natural gas is used as a raw material, is vaporized by a vaporization unit 2, enters a fine desulfurization unit 3 for desulfurization, then enters a temperature swing adsorption dehydration and decarburization unit 4 for dehydration and decarburization, and finally is rectified by a propane separation and rectification unit 5, an ethane separation and rectification unit 6 and a methane separation and rectification unit 7 to prepare high-purity methane, high-purity ethane and high-purity propane.
The fine desulfurization unit 3 adopts one or more of a desulfurizer, namely a W102 active carbon fine desulfurizer, a W803 high-efficiency desulfurization catalyst, a composite metal oxide desulfurizer, an iron oxide desulfurizer, an aluminum oxide desulfurizer and a zinc oxide desulfurizer; the operation temperature of the fine desulfurization unit is normal temperature, and the operation pressure of the fine desulfurization unit is 0.5-2.5MPa; the airspeed of the desulfurization operation is 800-3000H -1 。
The adsorbent adopted by the temperature swing adsorption, dehydration and decarbonization unit 4 is formed by mixing 3A, 4A, 5A, 10A and 13X molecular sieve adsorbents; the temperature of the adsorption operation of the temperature swing adsorption unit is 10-35 ℃, and the preferred operation temperature is 10-15 ℃; the adsorption operating pressure of the temperature swing adsorption unit is 0.5-2.5MPa, and the preferred operating pressure is 1.0-1.6MPa.
The propane separation and rectification unit 5 comprises a propane rectification tower 51 and a propane separation tower 52 which are sequentially arranged, the temperature swing adsorption dehydration decarburization unit 4 is communicated with the propane rectification tower 51 through a pipeline, industrial propane at the bottom of the propane separation tower 52 is filled through an outlet pipeline at the bottom of the propane separation tower 52, and high-purity propane at the bottom of the propane rectification tower 51 is filled through an outlet pipeline at the bottom of the propane rectification tower 51.
The ethane separation and rectification unit 6 comprises an ethane rectification tower 61 and an ethane separation tower 62 which are sequentially arranged, the propane separation and rectification unit 5 is communicated with the ethane rectification tower 61 through a pipeline, industrial ethane at the bottom of the ethane separation tower 62 is filled through an outlet pipeline at the bottom of the ethane separation tower 62, high-purity ethane at the bottom of the ethane rectification tower 61 is filled through an outlet pipeline at the bottom of the ethane rectification tower 61, and the outlet pipeline at the bottom of the ethane rectification tower 61 is communicated with the temperature swing adsorption, dehydration and decarbonization unit 4 through a pipeline.
The methane separation and rectification unit 7 comprises a methane rectification tower 71 and a methane separation tower 72 which are sequentially arranged, the ethane separation and rectification unit 6 is communicated with the methane rectification tower 71 through a pipeline, industrial methane at the bottom of the methane separation tower 72 is filled through an outlet pipeline at the bottom of the methane separation tower 72, and high-purity methane at the bottom of the methane rectification tower 71 is filled through an outlet pipeline at the bottom of the methane rectification tower 71.
The system still includes main heat transfer unit 8, cold box unit 9 and natural gas line 10, and the thick propane warp at 5 tops of propane separation rectification unit the outlet conduit at 5 tops of propane separation rectification unit with natural gas line 10 intercommunication, the thick ethane warp at 6 tops of ethane separation rectification unit the outlet conduit at 6 tops of ethane separation rectification unit with natural gas line 10 intercommunication, the thick methane warp at 7 tops of methane separation rectification unit 7 the outlet conduit at 7 tops of methane separation rectification unit with natural gas line 10 intercommunication, the top of temperature swing adsorption dehydration decarbonization unit 4 with natural gas line 10 passes through the pipeline intercommunication, the top of head tank 1 with natural gas line 10 passes through the pipeline intercommunication.
The main heat exchange unit 8, the propane separation and rectification unit 5, the ethane separation and rectification unit 6 and the methane separation and rectification unit 7 are arranged in the cold box unit 9, and pipelines between the temperature swing adsorption dehydration and decarburization unit 4 and the propane separation and rectification unit 5 pass through the main heat exchange unit 8, the propane separation and rectification unit 5, the ethane separation and rectification unit 6 and outlet pipelines of the methane separation and rectification unit 8.
When the temperature swing adsorption, dehydration and decarburization unit 4 adsorbs excessive impurities, the impurities need to be removed by analysis, at this time, the prepared high-purity ethane enters the temperature swing adsorption, dehydration and decarburization unit 4 through an outlet pipeline at the bottom of the ethane rectification tower 61 to be analyzed and decontaminated, and the decontaminated gas is sold through a natural gas pipeline 10; the temperature of the temperature swing adsorption unit is 150-250 ℃, and the preferable temperature of the temperature swing adsorption unit is 200-220 ℃; the desorption operation pressure of the temperature swing adsorption unit is 0.1-0.5MPA, and the preferable desorption operation pressure is 0.1-0.2MPA.
It should be noted that the valves disposed on the pipes are all disposed conventionally, and are opened when circulation is needed, and closed when circulation is not needed.
The utility model provides a by the system working process of natural gas preparation high-purity methane, high-purity ethane and high-purity propane as follows:
firstly, liquefied natural gas is flashed in a liquefied natural gas raw material tank 1 to remove most of nitrogen, the flash gas enters a natural gas pipeline 10 to be sold as natural gas, the liquefied natural gas without most of nitrogen is vaporized by a vaporization unit 2 and then enters a fine desulfurization unit 3 for desulfurization, then enters a temperature swing adsorption dehydration and decarburization unit 4 for dehydration and decarburization, then sequentially passes through a main heat exchange unit 8, a propane separation and rectification unit 5, an ethane separation and rectification unit 6 and a methane separation and rectification unit 7 for heat exchange and rectification separation, high-purity propane, high-purity methane and high-purity ethane are obtained through rectification and purification and then filled in pipelines, the obtained industrial propane, industrial ethane and industrial methane are filled in pipelines and sold as fuels, and the obtained crude propane, crude ethane and crude methane enter the natural gas pipeline 10 to be mixed and sold as pipeline natural gas.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Without departing from the spirit and scope of the present disclosure, those skilled in the art can make various changes and modifications, which will fall into the scope of the present disclosure.
Claims (6)
1. A system for preparing high-purity methane, high-purity ethane and high-purity propane from natural gas comprises a liquefied natural gas raw material tank (1), a vaporization unit (2), a fine desulfurization unit (3), a temperature swing adsorption dehydration decarburization unit (4), a propane separation rectification unit (5), an ethane separation rectification unit (6) and a methane separation rectification unit (7), and is characterized in that the liquefied natural gas raw material tank (1) is communicated with the vaporization unit (2) through a pipeline, the vaporization unit (2) is communicated with the fine desulfurization unit (3) through a pipeline, the fine desulfurization unit (3) is communicated with the temperature swing adsorption dehydration decarburization unit (4) through a pipeline, the temperature swing adsorption dehydration decarburization unit (4) is communicated with the propane separation rectification unit (5) through a pipeline, the propane separation rectification unit (5) is communicated with the ethane separation rectification unit (6) through a pipeline, and the ethane separation unit (6) is communicated with the methane separation unit (7) through a pipeline.
2. The system for preparing high-purity methane, high-purity ethane and high-purity propane from natural gas according to claim 1, wherein the propane separation and rectification unit (5) comprises a propane rectification column (51) and a propane separation column (52) which are arranged in sequence, the temperature swing adsorption dehydration and decarbonization unit (4) is communicated with the propane rectification column (51) through a pipeline, industrial propane at the bottom of the propane separation column (52) is filled through an outlet pipeline at the bottom of the propane separation column (52), and high-purity propane at the bottom of the propane rectification column (51) is filled through an outlet pipeline at the bottom of the propane rectification column (51).
3. The system for producing high-purity methane, high-purity ethane and high-purity propane from natural gas according to claim 1, wherein the ethane separation and rectification unit (6) comprises an ethane rectification column (61) and an ethane separation column (62) which are arranged in sequence, the propane separation and rectification unit (5) and the ethane rectification column (61) are communicated through a pipeline, industrial ethane at the bottom of the ethane separation column (62) is filled through an outlet pipeline at the bottom of the ethane separation column (62), high-purity ethane at the bottom of the ethane rectification column (61) is filled through an outlet pipeline at the bottom of the ethane rectification column (61), and the outlet pipeline at the bottom of the ethane rectification column (61) is communicated with the temperature swing adsorption dehydration decarburization unit (4) through a pipeline.
4. The system for preparing high-purity methane, high-purity ethane and high-purity propane from natural gas as claimed in claim 1, wherein the methane separation and rectification unit (7) comprises a methane rectification tower (71) and a methane separation tower (72) which are arranged in sequence, the ethane separation and rectification unit (6) is communicated with the methane rectification tower (71) through a pipeline, industrial methane at the bottom of the methane separation tower (72) is filled through an outlet pipeline at the bottom of the methane separation tower (72), and high-purity methane at the bottom of the methane rectification tower (71) is filled through an outlet pipeline at the bottom of the methane rectification tower (71).
5. The system for preparing high-purity methane, high-purity ethane and high-purity propane from natural gas according to claim 1, wherein the system further comprises a main heat exchange unit (8), a cold box unit (9) and a natural gas pipeline (10), crude propane at the top of the propane separation and rectification unit (5) is communicated with the natural gas pipeline (10) through an outlet pipeline at the top of the propane separation and rectification unit (5), crude ethane at the top of the ethane separation and rectification unit (6) is communicated with the natural gas pipeline (10) through an outlet pipeline at the top of the ethane separation and rectification unit (6), crude methane at the top of the methane separation and rectification unit (7) is communicated with the natural gas pipeline (10) through an outlet pipeline at the top of the methane separation and rectification unit (7), the top of the temperature swing adsorption and decarbonization and dehydration unit (4) is communicated with the natural gas pipeline (10) through a pipeline, and the top of the liquefied natural gas raw material tank (1) is communicated with the natural gas pipeline (10) through a pipeline.
6. The system for producing high purity methane, high purity ethane, and high purity propane from natural gas according to claim 5, wherein the main heat exchange unit (8), the propane separation rectification unit (5), the ethane separation rectification unit (6), and the methane separation rectification unit (7) are disposed inside the cold box unit (9), and the piping between the temperature swing adsorption dehydration decarburization unit (4) and the propane separation rectification unit (5) passes through the main heat exchange unit (8), the propane separation rectification unit (5), the ethane separation rectification unit (6), and the outlet piping of the methane separation rectification unit all pass through the main heat exchange unit (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221834815.6U CN217612995U (en) | 2022-07-13 | 2022-07-13 | System for preparing high-purity methane, high-purity ethane and high-purity propane from natural gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221834815.6U CN217612995U (en) | 2022-07-13 | 2022-07-13 | System for preparing high-purity methane, high-purity ethane and high-purity propane from natural gas |
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