CN217103771U - Natural gas pretreatment device - Google Patents
Natural gas pretreatment device Download PDFInfo
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- CN217103771U CN217103771U CN202220877781.2U CN202220877781U CN217103771U CN 217103771 U CN217103771 U CN 217103771U CN 202220877781 U CN202220877781 U CN 202220877781U CN 217103771 U CN217103771 U CN 217103771U
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Abstract
The utility model discloses a natural gas preprocessing device, the device mainly include into gas separator, more than 2 in turn online and regenerated compound packed bed, regeneration gas cooler, regeneration gas separator, regeneration gas heating furnace and dust filter. The utility model discloses replace traditional sour gas remove device and heavy hydrocarbon remove device with online, the regenerated compound packed bed in turn to according to the raw materials natural gas matter, the adsorbent that the reasonable selection compound packed bed loaded packs, has realized desorption in the time of sour gas, water and the heavy hydrocarbon in the lower raw materials natural gas of sour gas load, thereby has simplified natural gas preprocessing device's structure, has reduced the consumption of unit product effectively.
Description
Technical Field
The utility model relates to a natural gas liquefaction field especially relates to the preliminary treatment before the cryogenic liquefaction of natural gas raw materials, and more specifically says, relates to a novel natural gas preliminary treatment device.
Background
At present, the natural gas pretreatment technology of a Liquefied Natural Gas (LNG) plant mainly adopts a method of absorbing alcohol amine (such as MDEA) solution to remove carbon dioxide and trace H in natural gas 2 S, and the like. The method is effective for pretreating raw natural gas with high carbon dioxide acid gas load (generally higher than 0.5%), but for pipeline natural gas of a gas field with low acid gas load (such as a pipeline of puckering blue located in western China), the method not only has complex flow and large amount of required equipment (an absorption tower, a stripping tower, a reboiler, a flash evaporator, a lean amine-rich heat exchanger, an overhead condenser and the like are required),but also has a series of operational problems such as foaming, flooding, corrosion, etc.
In addition, in the current LNG factory, a method for washing a heavy hydrocarbon tower is mainly adopted for removing heavy hydrocarbon from natural gas, or a simplified precooling separation method is adopted, namely, the natural gas is cooled and then separated and removed of heavy hydrocarbon by using a heavy hydrocarbon separation tank (which can be regarded as a separation tower with 1 tower plate), the two methods both need to precool the natural gas and use the tower for separation, the device is complex and hydrocarbon condensate liquid with out-of-specification and a treatment facility thereof can be generated.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a natural gas preprocessing device, its structure is very simple, can save a large amount of processing units to be convenient for use at outlying gas well or marine FLNG, and the energy consumption is lower.
In order to solve the technical problem, the natural gas pretreatment device of the utility model mainly comprises a gas inlet and separator, a composite packed bed, a regenerated gas cooler, a regenerated gas separator, a dust filter and a regenerated gas heating furnace; wherein:
an inlet of the gas inlet separator is connected with a gas inlet pipeline of raw natural gas, and a top gas phase outlet is connected with a top gas inlet pipeline of the composite packed bed through a pipeline;
the top gas outlet pipeline of the composite packed bed is connected with the inlet of the regenerated gas cooler; a natural gas outlet pipeline at the bottom of the composite packed bed is connected with an inlet of the dust filter; the bottom regeneration gas inlet pipeline of the composite packed bed is connected with the outlet of the regeneration gas heating furnace;
the outlet of the regeneration gas cooler is connected with the inlet of the regeneration gas separator through a pipeline;
the outlet of the dust filter is respectively connected with a liquefaction unit of an LNG factory and the inlet of the regeneration gas heating furnace through pipelines;
and the outlet of the regenerated gas heating furnace is connected with the inlet of the regenerated gas cooler through a pipeline.
The number of the composite packed beds is more than 2, preferably 2, and the composite packed beds can also be widened to 3. Composite packed bedThe upper part and the lower part of the ball are filled with inert ceramic balls, preferably inert alumina ceramic balls; the middle part is filled with the acid gas, water and C in the natural gas 6 The composite adsorbent packing of the above heavy hydrocarbon (aromatic hydrocarbon, naphthenic hydrocarbon, etc.) is preferably packed in layers, and more preferably packed with an a-type molecular sieve, a porous medium adsorbent, and an X-type molecular sieve in this order from top to bottom.
Preferably, switch valves are respectively arranged on a top gas phase outlet pipeline of the gas inlet separator, a top gas inlet pipeline and a gas outlet pipeline of the composite packed bed, a bottom natural gas outlet pipeline and a regenerated gas inlet pipeline, and pipelines between the regenerated gas heating furnace and the regenerated gas cooler.
Preferably, the bottom liquid phase outlets of the gas inlet separator and the regeneration gas separator are respectively connected with an oily sewage treatment unit of the LNG plant through pipelines.
And the top gas phase outlet of the regeneration gas separator is preferably connected with a fuel gas pipeline or a downstream pipe network of the LNG plant.
Preferably, a demercuration device and a post-demercuration dust filter can be further arranged on an outlet pipeline of the dust filter, and are used for performing demercuration and dust removal treatment on natural gas, an inlet of the demercuration device is connected with an outlet of the dust filter, an outlet of the demercuration device is connected with an inlet of the post-demercuration dust filter, and an outlet of the post-demercuration dust filter is respectively connected with a liquefaction unit of an LNG plant and an inlet of the regeneration gas heating furnace.
Compared with the prior natural gas pretreatment technology of LNG mill, the utility model discloses a natural gas pretreatment device has following advantage and beneficial effect:
1. a single composite packed bed (two composite packed beds are alternately on-line and regenerated) is used for replacing the traditional acid gas removing device and heavy hydrocarbon removing device which use alcohol amine solution, and simultaneously removing acid gas, water and C in raw natural gas 6 The heavy hydrocarbon (arene, cyclane and the like) greatly simplifies the structure of the natural gas pretreatment device, reduces the required equipment quantity and effectively reduces the power consumption of unit products.
2. According to the natural of raw materialsGas quality, a proper adsorbent material combination (A type molecular sieve, porous material adsorbent and X type molecular sieve) is selected, and a composite packed bed is filled in a layered mode, so that acid gas, water and C in raw material natural gas with low acid gas load (generally less than 0.5 percent) are realized 6 The heavy hydrocarbon is removed simultaneously.
Drawings
Fig. 1 is a schematic diagram of the structure and process flow of a natural gas pretreatment device of embodiment 1 of the present invention;
fig. 2 is a schematic diagram of the packing structure of the composite packed bed in the natural gas pretreatment device of fig. 1.
The reference numerals in the figures are illustrated as follows:
1: gas inlet separator
2: first composite packed bed
3: second composite packed bed
4: mercury remover
5: regeneration gas separator
6: regenerated gas heating furnace
7: regeneration gas cooler
8: first dust filter
9: second dust filter
10-19: switch valve
20. 21, 25: liquid level control valve
22: emptying valve
23: flow control valve
24: fuel gas regulating valve
26. 30: porcelain ball
27: first adsorbent
28: second adsorbent
29: third adsorbent
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings and examples in order to more specifically understand the technical content, characteristics and functions of the present invention.
Example 1
The natural gas pretreatment device for the LNG plant of the present embodiment, as shown in fig. 1, mainly includes a gas inlet separator 1, 2 composite packed beds, a demercuration device 4, a regeneration gas cooler 7, a regeneration gas separator 5, a regeneration gas heating furnace 6, and 2 dust filters. Wherein:
the gas inlet separator 1 is arranged on a gas inlet pipeline of the raw material natural gas and is used for separating a gas phase and a liquid phase in the raw material natural gas. The lower inlet of the gas inlet separator 1 is connected with a gas inlet pipeline of raw natural gas. A gas phase outlet pipeline at the top of the gas inlet-separator 1 is provided with a switch valve 10, and a liquid phase outlet pipeline at the bottom of the gas inlet-separator is communicated with an oily sewage treatment unit of an LNG plant.
Composite packed bed for removing acid gas, water and C in natural gas 6 The above heavy hydrocarbons. And the top air inlet pipelines of the 2 composite packed beds (the composite packed bed 2 and the composite packed bed 3) are respectively provided with a switch valve 11 and a switch valve 13, and are connected with the switch valve 10 through pipelines. And a switching valve 12 and a switching valve 14 are respectively arranged on the gas outlet pipeline at the top of each of the 2 composite packed beds and are connected with the inlet of the regeneration gas cooler 7 through a pipeline. And a switching valve 17 and a switching valve 19 are respectively arranged on the natural gas outlet pipelines at the bottoms of the 2 composite packed beds and are connected with the inlet of the first dust filter 8 through a pipeline. The internal filling structure of the composite packed bed is shown in figure 2, and the uppermost layer and the lowermost layer are inert alumina ceramic balls and are used for supporting the bed layer and distributing airflow; the first adsorbent 27, the second adsorbent 28 and the third adsorbent 29 are filled between the two layers of porcelain balls from top to bottom in sequence. The adsorbent material is selected based on the gas quality of the feed natural gas. In this embodiment, the first adsorbent 27 is a type a molecular sieve filler (e.g., a type 4A molecular sieve) for dehydration and removal of carbon dioxide by auxiliary physical adsorption (the molecular sieve is an ideal deeply dried adsorbent material, so that dehydration can be completed while carbon dioxide is removed, and after dehydration and drying, the water dew point of the natural gas can be reduced to below-70 ℃); the second adsorbent 28 is porous adsorbent (such as silica gel) for selectively adsorbing and removing C such as aromatic hydrocarbon and cycloalkane 6 The above heavy hydrocarbons; the third adsorbent 29 adopts X-type molecular sieve packing for adsorbing carbon dioxide and selectively adsorbing and removing C 6 The above heavy hydrocarbons. The adsorbent material combination of the embodiment can ensure that the online composite packed bed is onlineThe dynamic adsorption in time does not break through.
The dust filter is used for filtering and removing dust in the gas. The outlet of the first dust filter 8 is connected to the upper inlet of the demercuration device 4 through a pipeline. The lower outlet of the demercuration device 4 is connected with the inlet of the second dust filter 9 through a pipeline. The demercuration device 4 is used for removing mercury in natural gas. The outlet pipeline of the second dust filter 9 is divided into two paths to be respectively led to the liquefaction unit of the LNG factory and the inlet of the regeneration gas heating furnace 6. The outlet pipeline of the regenerated gas heating furnace 6 is divided into three paths, one path is connected with the inlet of the regenerated gas cooler 7 through a switch valve 15, and the other two paths are respectively connected with the bottom regenerated gas inlet pipelines of the composite packed bed 2 and the composite packed bed 3 through a switch valve 16 and a switch valve 18.
The outlet of the regeneration gas cooler 7 is connected with the inlet in the middle of the regeneration gas separator 5 through a pipeline. The regeneration gas separator 5 serves to separate a gas phase and a liquid phase in the regeneration gas. The top gas phase outlet of the regeneration gas separator 5 leads to the fuel gas pipeline or downstream pipeline of the LNG plant. And a liquid phase outlet at the bottom of the regeneration gas separator 5 is communicated with an oily sewage treatment unit of the LNG plant.
The operation process flow of the natural gas pretreatment device is described in detail below.
When the natural gas pretreatment device of the embodiment is in operation, the two composite packed beds are alternately regenerated on line. Taking the first composite packed bed 2 on-line and the second composite packed bed 3 as an example, at this time, the on-off valve 11, the on-off valve 14, the on-off valve 17, and the on-off valve 18 are opened, and the on-off valve 12, the on-off valve 13, the on-off valve 16, and the on-off valve 19 are closed. The method comprises the following steps that raw material natural gas containing carbon dioxide, heavy hydrocarbon and water vapor enters a gas-liquid inlet separator 1, after gas-liquid separation, a liquid phase is sent to an oily sewage treatment unit of an LNG factory through a bottom outlet of the gas-liquid inlet separator 1, a gas phase is separated from the gas-liquid inlet separator 1 through a top outlet of the gas-liquid inlet separator 1, and enters an online first composite packed bed 2 from the top of the first composite packed bed 2 through a switch valve 10 and a switch valve 11.
The natural gas is sequentially adsorbed by three layers of adsorbents in the first composite packed bed 2 to remove carbon dioxide, water and C 6 The above heavy hydrocarbons. In the natural gas after adsorption treatment by the composite packed bed,the content of carbon dioxide is reduced to below 50ppm, the water content is less than 0.1ppm, and C such as aromatic hydrocarbon and the like 6 The heavy hydrocarbon content is less than 5 ppm.
The natural gas after removing carbon dioxide, water and heavy hydrocarbon leaves the first composite packed bed 2 from the bottom outlet of the first composite packed bed 2, enters the first dust filter 8 through the switch valve 17 to remove possible dust in the air flow, then sequentially enters the demercuration device 4 and the second dust filter 9, most of the natural gas goes to the liquefaction unit of the LNG plant after demercuration and dust removal, and the small part of the natural gas goes to the regenerated gas heating furnace 6 to be heated and dried.
The high-temperature dry regeneration gas from the regeneration gas heating furnace 6 flows reversely, and a part of the high-temperature dry regeneration gas flows to the regeneration gas cooler 7 through the switch valve 15; the other part enters the second composite packed bed 3 from the bottom of the second composite packed bed 3 through the switch valve 18 to regenerate the second composite packed bed 3. The regeneration gas containing acid gas, heavy hydrocarbons and water then leaves the second composite packed bed 3 through the outlet at the top of the second composite packed bed, passes through the on-off valve 14, and enters the regeneration gas cooler 7. The regenerated gas entering the regenerated gas cooler 7 is cooled by the regenerated gas cooler 7 and then enters the regenerated gas separator 5 for gas-liquid separation, the sewage containing acid and hydrocarbon is sent to an oily sewage treatment unit of an LNG factory from a bottom liquid phase outlet of the regenerated gas separator 5, and the gas phase leaves the regenerated gas separator 5 from a top outlet of the regenerated gas separator 5 and is balanced into fuel gas of the LNG factory (suitable for LNG facilities using a gas turbine or needing self-power generation or remote well liquefaction facilities) or is sent to a downstream pipe network (suitable for urban peak regulation type offshore LNG devices).
Example 2
The embodiment is a modified embodiment of a natural gas pretreatment device of an LNG peak shaving device in Gansu.
Before reforming transform, this LNG peak regulation device's natural gas preprocessing device includes 2 MDEA hydramine absorption towers that are used for desorption acid gas in proper order, 3 drying towers (T-3101A/B/C, it is used for dehydration drying to fill 4A molecular sieve), 2 adsorbent beds (V-202A/B, it is used for the heavy hydrocarbon desorption to fill active carbon), 1 heavy hydrocarbon knockout drum (V-304, be used for the gas-liquid separation in order to desorption heavy hydrocarbon behind the natural gas precooling), use 8 equipment to get rid of former original desorption totallyAcid gas, water and heavy hydrocarbons in the feed natural gas. However, the problem of mixed supply of natural gases from different sources exists in the raw material gas source of the LNG peak shaving device, so that C in the raw material gas in winter is caused 6 Above heavy hydrocarbon load fluctuation, heavy hydrocarbon knockout drum can't effectively get rid of C 6 The above heavy hydrocarbons, especially aromatic hydrocarbons; meanwhile, the acid gas load in the raw material gas is relatively low for a relatively long time (the acid gas load)<0.2%), the complex MDEA system not only has high operation cost, large maintenance workload, but also has high energy consumption.
After reforming transform, this LNG peak shaving device's natural gas preprocessing device uses the utility model discloses embodiment 1's structure (only used 2 equipment to come acid gas, water and heavy hydrocarbon in the desorption raw materials natural gas), use following filler scheme to two compound packed beds simultaneously: inert alumina ceramic balls with the diameter of 12mm are filled at the upper part, and the filling height is 150 mm; three layers of fillers are filled in the middle, wherein the upper layer of filler, namely the first adsorbent, adopts NS-MS filler 1A (specification: 4-8 meshes, filling quantity: 7 square and filling height: 1600mm), the middle layer of filler, namely the second adsorbent, adopts NS-SG GX (aperture: 2-4mm, filling quantity: 11 square and filling height: 2900mm), and the lower layer of filler, namely the third adsorbent, adopts NS-MS filler 2S (specification: 6-8 meshes, filling quantity: 10 square and filling height: 2500 mm); two layers of inert alumina ceramic balls are filled in the lower part, the diameter of the upper layer ceramic ball is 3mm, the diameter of the lower layer ceramic ball is 6mm, and the filling height of each layer is 75 mm.
After transformation, the LNG peak shaving device can be stably operated at full load for more than two and half years, so that the power consumption of the device in operation and the consumption of public works (fuel gas and the like) are greatly saved (the power consumption per ton of LNG products is reduced by about 5 percent, and the operation cost of the power consumption, the consumption of the fuel and the natural gas and the like is saved by about 170 ten thousand RMB per year), and the effects of energy conservation and emission reduction are well realized.
The above-mentioned embodiments are only possible or preferred embodiments of the present invention, and are not intended to limit the scope of the invention, so that the present invention shall not be limited to the above-mentioned embodiments.
Claims (6)
1. The natural gas pretreatment device is characterized by comprising a gas inlet separator, a composite packed bed, a regenerated gas cooler, a regenerated gas separator, a first dust filter and a regenerated gas heating furnace; wherein:
an inlet of the gas inlet separator is connected with a gas inlet pipeline of raw natural gas, and a top gas phase outlet is connected with a top gas inlet pipeline of the composite packed bed through a pipeline;
the top gas outlet pipeline of the composite packed bed is connected with the inlet of the regenerated gas cooler; a natural gas outlet pipeline at the bottom of the composite packed bed is connected with an inlet of the first dust filter; the bottom regeneration gas inlet pipeline of the composite packed bed is connected with the outlet of the regeneration gas heating furnace;
the outlet of the regeneration gas cooler is connected with the inlet of the regeneration gas separator through a pipeline;
an outlet of the first dust filter is respectively connected with a liquefaction unit of an LNG factory and an inlet of the regeneration gas heating furnace through pipelines;
and the outlet of the regenerated gas heating furnace is connected with the inlet of the regenerated gas cooler through a pipeline.
2. The natural gas pretreatment device according to claim 1, wherein the number of the composite packed beds is 2 or more.
3. The natural gas pretreatment device according to claim 1, wherein switching valves are respectively arranged on a top gas phase outlet pipeline of the gas inlet separator, a top gas inlet pipeline and a gas outlet pipeline of the composite packed bed, a bottom natural gas outlet pipeline and a regeneration gas inlet pipeline, and pipelines between the regeneration gas heating furnace and the regeneration gas cooler.
4. The natural gas pretreatment device according to claim 1, wherein bottom liquid phase outlets of the gas inlet separator and the gas regeneration separator are respectively connected with an oily sewage treatment unit of an LNG plant through pipelines.
5. The natural gas pretreatment device of claim 1, wherein the top gas phase outlet of the regeneration gas separator is connected to a fuel gas pipeline or a downstream pipe network of an LNG plant.
6. The natural gas pretreatment device according to claim 1, wherein a demercuration device and a second dust filter are further arranged on the outlet pipeline of the first dust filter, an inlet of the demercuration device is connected with an outlet of the first dust filter, an outlet of the demercuration device is connected with an inlet of the second dust filter, and outlets of the second dust filter are respectively connected with a liquefaction unit of an LNG plant and an inlet of the regeneration gas heating furnace.
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| CN202220877781.2U CN217103771U (en) | 2022-04-15 | 2022-04-15 | Natural gas pretreatment device |
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| CN202220877781.2U CN217103771U (en) | 2022-04-15 | 2022-04-15 | Natural gas pretreatment device |
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