CN220012558U - Natural gas decarbonization system - Google Patents

Natural gas decarbonization system Download PDF

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Publication number
CN220012558U
CN220012558U CN202321679686.2U CN202321679686U CN220012558U CN 220012558 U CN220012558 U CN 220012558U CN 202321679686 U CN202321679686 U CN 202321679686U CN 220012558 U CN220012558 U CN 220012558U
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gas
decarburization
decarbonization
liquid
primary
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CN202321679686.2U
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王福勃
方新成
冉华
苟增田
柴杰
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Shandong Helishi Petrochemical Technology Development Co ltd
Dongying Helishi Gas Co ltd
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Shandong Helishi Petrochemical Technology Development Co ltd
Dongying Helishi Gas Co ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02CCAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/40Capture or disposal of greenhouse gases of CO2

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Abstract

The utility model relates to a natural gas decarburization system, which comprises a main separator, a primary decarburization device, a primary analysis device, a secondary decarburization device, a secondary analysis device and a decarburization gas post-treatment system, wherein a gas phase outlet of the main separator is connected with a gas inlet of the primary decarburization device, a decarburization liquid inlet of the primary decarburization device is connected with a liquid outlet of the primary analysis device, a liquid inlet of the primary analysis device is connected with a decarburization liquid outlet of the primary decarburization device, a gas outlet of the primary decarburization device is connected with a gas inlet of the secondary decarburization device, a decarburization liquid inlet of the secondary analysis device is connected with a decarburization liquid outlet of the secondary decarburization device through a pipeline, a decarburization liquid heater is arranged on the pipeline, and a gas outlet of the secondary decarburization device is connected with the decarburization gas post-treatment system. The advantages are that: the decarburization effect is good, and the system is relatively energy-saving.

Description

Natural gas decarbonization system
Technical Field
The utility model relates to the technical field of natural gas decarburization, in particular to a natural gas decarburization system.
Background
The national standard of natural gas in China is GB17820-2018, and the requirements are that: the mole fraction (%) of carbon dioxide in the natural gas is less than or equal to 3%, the mole fraction (%) of carbon dioxide in the natural gas is less than or equal to 4%, if the carbon dioxide content in the natural gas exceeds the standard, decarburization treatment is needed to remove carbon dioxide, and chemical absorption, pressure swing adsorption and other technologies are generally adopted to remove carbon dioxide.
At present, most of the existing natural gas decarburization systems involve high-temperature decarburization, and a primary decarburization process is generally adopted, so that the purification degree of natural gas is not very high, and the decarburization effect is to be improved. In addition, the whole decarburization process of the existing process has high energy consumption.
Disclosure of Invention
The utility model aims to provide a natural gas decarburization system, which effectively overcomes the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
a natural gas decarburization system comprises a main separator, a primary decarburization device, a primary desorption device, a secondary decarburization device, a secondary desorption device and a decarburization gas post-treatment system, wherein a gas phase outlet of the main separator is connected with a gas inlet of the primary decarburization device through a pipeline, a decarburization liquid inlet of the primary decarburization device is connected with a liquid outlet of the primary desorption device through a pipeline, a liquid inlet of the primary desorption device is connected with a decarburization liquid outlet of the primary decarburization device through a pipeline, a gas outlet of the primary decarburization device is connected with a desorption gas post-treatment system through a pipeline, a gas outlet of the primary decarburization device is connected with a gas inlet of the secondary decarburization device through a pipeline, a decarburization liquid inlet of the secondary decarburization device is connected with a decarburization liquid outlet of the secondary decarburization device through a pipeline, and a decarburization liquid heater is arranged on the pipeline, a gas outlet of the secondary desorption device is connected with the gas post-treatment system through a pipeline, and a gas outlet of the secondary decarburization device is connected with the decarburization gas post-treatment system through a pipeline.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the first-stage decarburization device and the second-stage decarburization device are both carbon dioxide absorption towers, and the decarburization liquid in the carbon dioxide absorption towers is compound decarburization liquid.
Further, the first-stage analysis device and the second-stage analysis device are both carbon dioxide analysis towers.
Further, the main separator is a cyclone separator.
Further, a heat exchanger for preheating is also arranged on a pipeline connected with the liquid inlet of the secondary analysis device and the decarburization liquid outlet of the secondary decarburization device.
Further, the analysis gas post-treatment system comprises an analysis gas water cooler and an analysis gas separator, wherein a gas outlet of the primary analysis device is sequentially connected with the analysis gas water cooler and the analysis gas separator in series through pipelines.
Further, the decarburization liquid heater is a pipeline electric heater.
Further, the decarbonization gas post-treatment system comprises a decarbonization gas water cooler and a decarbonization gas separator, and a gas outlet of the secondary decarbonization device is sequentially connected in series with the decarbonization gas water cooler and the decarbonization gas separator through pipelines.
Further, a primary gas filter is arranged on a pipeline connected with the liquid inlet of the primary analysis device and the decarburization liquid outlet of the primary decarburization device, and a secondary gas filter is arranged on a pipeline connected with the liquid inlet of the secondary analysis device and the decarburization liquid outlet of the secondary decarburization device through a pipeline.
Further, a first-stage pump body is arranged on a pipeline connected with a decarburization liquid inlet of the first-stage decarburization device and a liquid outlet of the first-stage analysis device, and a second-stage pump body and a lean liquid water cooler are sequentially connected in series on a pipeline connected with a decarburization liquid inlet of the second-stage decarburization device and a liquid outlet of the second-stage analysis device.
The beneficial effects of the utility model are as follows: the structure design is reasonable, through the two-stage decarbonization, the decarbonization is more thorough to the whole process only needs to heat for the two-stage decarbonization, and decarbonization effect is better, and simultaneously, the whole system is comparatively energy-conserving.
Drawings
FIG. 1 is a flow chart of a natural gas decarbonization system of the present utility model.
In the drawings, the list of components represented by the various numbers is as follows:
1. a main separator; 2. a primary decarburization device; 3. a first-stage analysis device; 4. a secondary decarburization device; 5. a second-stage analysis device; 6. a decarburization liquid heater; 7. a heat exchanger; 81. a desorption gas water cooler; 82. analyzing the gas separator; 91. a decarbonizing gas water cooler; 92. a decarburization gas separator; 101. a primary gas filter; 102. a secondary gas filter; 103. a first stage pump body; 104. a secondary pump body; 105. a lean liquid water cooler.
Detailed Description
The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.
Examples: as shown in fig. 1, the natural gas decarbonization system of the present embodiment includes a main separator 1, a primary decarbonization device 2, a primary resolution device 3, a secondary decarbonization device 4, a secondary resolution device 5, and a decarbonization gas post-treatment system, wherein a gas phase outlet of the main separator 1 is connected to a gas outlet of the primary decarbonization device 2 through a pipeline, a decarbonization liquid inlet of the primary decarbonization device 2 is connected to a liquid outlet of the primary resolution device 3 through a pipeline, a liquid outlet of the primary resolution device 3 is connected to a decarbonization liquid outlet of the primary decarbonization device 2 through a pipeline, a gas outlet of the primary resolution device 3 is connected to a post-treatment system of the resolved gas through a pipeline, a gas outlet of the primary decarbonization device 2 is connected to a gas inlet of the secondary decarbonization device 4 through a pipeline, a decarbonization liquid inlet of the secondary resolution device 5 is connected to a decarbonization liquid outlet of the secondary decarbonization device 4 through a pipeline, and a liquid heater 6 is provided on the pipeline, a gas outlet of the secondary resolution device 5 is connected to the post-treatment system of the decarbonization device through a gas post-treatment system through a pipeline.
Wherein, the first-stage decarbonization device 2 and the second-stage decarbonization device 4 are both carbon dioxide absorption towers, and the decarbonization liquid in the carbon dioxide absorption towers is compound decarbonization liquid. The compound decarbonization liquid belongs to a product (such as an activated MDEA solution) in the prior art, is based on Methyl Diethanolamine (MDEA), and is added with a CO2 removal solvent consisting of one or more activators, antioxidants and anticorrosive agents, and has the advantages of large CO2 absorption capacity, stable solvent, small solvent loss, basically no corrosion to carbon steel and the like, and can realize low-temperature decarbonization, wherein the decarbonization process comprises the following steps:
separating free water from natural gas (2.0 MPa) outside the world by a main separator 1, then feeding the natural gas into a first-stage decarbonization device 2 to remove most of carbon dioxide, further removing carbon dioxide by a second-stage decarbonization device 4 to ensure that the carbon dioxide of the natural gas after decarbonization meets the decarbonization requirement, and then removing the natural gas after treatment (mainly separating water in the gas) by a decarbonization gas post-treatment system to form an outside-world hydrocarbon removal device; the composite formula decarburization liquid from the primary decarburization device 2 is decompressed and then enters the primary analysis device 3, most of carbon dioxide in the decarburization liquid is released, and then the decarburization liquid is processed by an analysis gas post-processing system and then is emptied; the decarburization liquid from the primary analysis device 3 is boosted and then recycled in the primary decarburization device 2; the composite formula decarburization liquid from the secondary decarburization device 4 is decompressed, then enters the secondary desorption device 5 after being temperature-regulated by the decarburization liquid heater 6, most of carbon dioxide in the decarburization liquid can be effectively released, the released carbon dioxide gas enters the desorption gas post-treatment system for treatment and evacuation through the primary desorption device 3, and the decarburization liquid from the secondary desorption device 5 is boosted and sent to the secondary decarburization device 4 for recycling after being cooled. The whole system has reasonable structural design, through two-stage decarburization, and the whole process only needs to heat for the two-stage decarburization, so that the decarburization effect is good, and meanwhile, the whole system is relatively energy-saving.
In this embodiment, the primary resolving device 3 and the secondary resolving device 5 both adopt a carbon dioxide resolving tower in the prior art, and specific models are flexibly and reasonably selected according to actual use requirements.
In this embodiment, the main separator 1 is an existing cyclone separator in the market, and the specific model is flexibly and reasonably selected according to the actual use requirement. Of course, other separators may be selected as long as they are sufficient to separate water, oil, etc. from the natural gas.
As a preferred embodiment, a heat exchanger 7 for preheating is further provided in a line connecting the liquid inlet of the secondary analyzing device 5 and the decarburization liquid outlet of the secondary decarburizing device 4.
In the above embodiment, the decarburization liquid is preheated by exchanging heat with the decarburization liquid in the pipeline by the heat exchanger 7, so that the load of the subsequent decarburization liquid heater 6 is reduced, and the purpose of energy saving is achieved.
As a preferred embodiment, the system for post-treatment of the analysis gas includes an analysis gas water cooler 81 and an analysis gas separator 82, and the gas outlet of the primary analysis device 3 is connected in series with the analysis gas water cooler 81 and the analysis gas separator 82 in sequence through a pipeline.
In the above embodiment, the desorption gas is cooled down by the desorption gas water cooler 81, then separated from the water by the desorption gas separator 82, and then emptied. The water content of the emptying gas can be effectively removed, and the influence on the environment is reduced.
In this embodiment, the analysis gas water cooler 81 and the analysis gas separator 82 are all water coolers and separators existing in the market, and specific models can be flexibly and reasonably selected according to actual use requirements, which is not described herein.
In this embodiment, the above-mentioned decarburization liquid heater 6 employs a conventional pipe electric heater, and is capable of effectively adjusting the temperature of the decarburization liquid inside the pipe by heating the pipe.
As a preferred embodiment, the decarbonization gas post-treatment system includes a decarbonization gas cooler 91 and a decarbonization gas separator 92, and the gas outlet of the secondary decarbonization device 4 is connected in series with the decarbonization gas cooler 91 and the decarbonization gas separator 92 in sequence through a pipeline.
In the above embodiment, the decarbonized gas is cooled by the decarbonized gas water cooler 91, and then the water is separated by the decarbonizing gas separator 92, so that the purity of the decarbonized gas is higher, and the subsequent hydrocarbon removal treatment is facilitated.
In a preferred embodiment, a primary gas filter 101 is provided in a line connecting a liquid inlet of the primary analyzer 3 to a decarburization liquid outlet of the primary decarburization device 2, and a secondary gas filter 102 is provided in a line connecting a liquid inlet of the secondary analyzer 5 to a decarburization liquid outlet of the secondary decarburization device 4.
In the above embodiment, the design of the primary gas filter 101 and the secondary gas filter 102 can also filter the decarbonization from the primary decarbonization device 2 and the secondary decarbonization device 4 to remove impurities, thereby improving the recycling quality of the decarbonization liquid to a certain extent and ensuring that the decarbonization liquid maintains good decarbonization performance.
In this embodiment, the primary gas filter 101 and the secondary gas filter 102 may be conventional filters for filtering liquid in the market, and specific types may be flexibly and reasonably selected according to actual use requirements, which is not described herein.
In a preferred embodiment, a first pump 103 is provided in a line connecting a decarburization liquid inlet of the first decarburization device 2 and a liquid outlet of the first desorption device 3, and a second pump 104 and a lean water cooler 105 are sequentially connected in series to a line connecting a decarburization liquid inlet of the second decarburization device 4 and a liquid outlet of the second desorption device 5.
In the above embodiment, the primary pump body 103 and the secondary pump body 104 may each employ a conventional circulation pump, and the main purpose is to smoothly circulate the decarburized liquid in each pipeline after being boosted in pressure in the corresponding primary decarburization device 2 and secondary decarburization device 4. In this embodiment, the decarbonized gas after the second-stage analysis is subjected to good cooling and recycling by the lean water cooler 105. The lean solution water cooler 105 is a conventional water cooler in the market, and specific types of the lean solution water cooler can be flexibly and reasonably selected according to actual use requirements, which is not described herein.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A natural gas decarbonization system, characterized by: including main separator (1), one-level decarbonization device (2), one-level resolution device (3), second grade decarbonization device (4), second grade resolution device (5) and decarbonization gas aftertreatment system, the gas phase export of main separator (1) is through the pipeline connection the gas inlet of one-level decarbonization device (2), the decarbonization liquid import of one-level decarbonization device (2) is through the pipeline connection the liquid export of one-level resolution device (3), the liquid import of one-level resolution device (3) is through the pipeline connection the decarbonization liquid export of one-level decarbonization device (2), the gas export of one-level resolution device (3) is through the pipeline connection analysis gas aftertreatment system, the gas export of one-level decarbonization device (2) is through the pipeline connection the gas inlet of second grade decarbonization device (4), the decarbonization liquid import of second grade resolution device (5) is through the pipeline connection the liquid export of second grade resolution device (4), and should be equipped with on the decarbonization liquid import of second grade resolution device (5) through pipeline connection gas aftertreatment system after the decarbonization device (4).
2. A natural gas decarbonizing system according to claim 1, wherein: the primary decarburization device (2) and the secondary decarburization device (4) are both carbon dioxide absorption towers, and decarburization liquid in the carbon dioxide absorption towers is compound decarburization liquid.
3. A natural gas decarbonizing system according to claim 1, wherein: the primary analysis device (3) and the secondary analysis device (5) are both carbon dioxide analysis towers.
4. A natural gas decarbonizing system according to claim 1, wherein: the main separator (1) is a cyclone separator.
5. A natural gas decarbonizing system according to claim 1, wherein: and a heat exchanger (7) for preheating is further arranged on a pipeline connected with the liquid inlet of the secondary analysis device (5) and the decarburization liquid outlet of the secondary decarburization device (4).
6. A natural gas decarbonizing system according to claim 1, wherein: the analysis gas aftertreatment system comprises an analysis gas water cooler (81) and an analysis gas separator (82), wherein a gas outlet of the primary analysis device (3) is sequentially connected in series with the analysis gas water cooler (81) and the analysis gas separator (82) through pipelines.
7. A natural gas decarbonizing system according to claim 1, wherein: the decarburization liquid heater (6) is a pipeline electric heater.
8. A natural gas decarbonizing system according to claim 1, wherein: the decarbonization gas post-treatment system comprises a decarbonization gas water cooler (91) and a decarbonization gas separator (92), and a gas outlet of the secondary decarbonization device (4) is sequentially connected in series with the decarbonization gas water cooler (91) and the decarbonization gas separator (92) through pipelines.
9. A natural gas decarbonizing system according to claim 1, wherein: the liquid inlet of the primary analysis device (3) is connected with the decarburization liquid outlet of the primary decarburization device (2) through a pipeline, a primary gas filter (101) is arranged on the pipeline, and the liquid inlet of the secondary analysis device (5) is connected with the decarburization liquid outlet of the secondary decarburization device (4) through a pipeline, and a secondary gas filter (102) is arranged on the pipeline.
10. A natural gas decarbonizing system according to any one of claims 1 to 9, characterized in that: a primary pump body (103) is arranged on a pipeline connected with a decarburization liquid inlet of the primary decarburization device (2) and a liquid outlet of the primary analysis device (3), and a secondary pump body (104) and a lean liquid water cooler (105) are sequentially connected in series on a pipeline connected with a decarburization liquid inlet of the secondary decarburization device (4) and a liquid outlet of the secondary analysis device (5).
CN202321679686.2U 2023-06-29 2023-06-29 Natural gas decarbonization system Active CN220012558U (en)

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CN202321679686.2U CN220012558U (en) 2023-06-29 2023-06-29 Natural gas decarbonization system

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Application Number Priority Date Filing Date Title
CN202321679686.2U CN220012558U (en) 2023-06-29 2023-06-29 Natural gas decarbonization system

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CN220012558U true CN220012558U (en) 2023-11-14

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