CN112280605A - High-pressure natural gas dealkylation device - Google Patents
High-pressure natural gas dealkylation device Download PDFInfo
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- CN112280605A CN112280605A CN202011272823.1A CN202011272823A CN112280605A CN 112280605 A CN112280605 A CN 112280605A CN 202011272823 A CN202011272823 A CN 202011272823A CN 112280605 A CN112280605 A CN 112280605A
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- pipeline
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/402—Further details for adsorption processes and devices using two beds
Abstract
The invention relates to the technical field of energy and chemical engineering, in particular to a high-pressure natural gas dealkylation device which comprises a pre-separator, an adsorption tower, a regeneration air cooler, a refrigerator, an oil-gas separator, a circulating compressor, an electric heater and a dust filter. The technical scheme is as follows: and operating an adsorption process, allowing the raw material gas of the marginal well or the scattered well to enter a first adsorption tower for adsorption treatment, and conveying the hydrocarbon-removed gas to a gas outlet. When the first adsorption tower is saturated, the regeneration process is operated, and the medium gas is heated, cooled and separated to recover the adsorption function of the first adsorption tower; meanwhile, the second adsorption tower operates an adsorption process, and the feed gas enters the second adsorption tower for adsorption treatment. And when the second adsorption tower is saturated, the regeneration process is operated, and the first adsorption tower is operated. The adsorption tower circulates the above process to realize continuous dehydrogenation of the raw material gas. The device has the advantages of simple process flow, low manufacturing cost, full utilization of well pressure to realize direct charging, low system energy consumption and low overall operation cost.
Description
Technical Field
The invention relates to the technical field of energy and chemical industry, in particular to a high-pressure natural gas dealkylation device.
Background
The marginal well and the scattered well have small gas amount and high pressure, and the following two methods are generally adopted for recycling in order to fully utilize the pressure of the well mouth to recycle the CNG product:
when part of gas wells do not contain or contain a small amount of condensate, the method shown in figure 1 is adopted, natural gas passes through a high-pressure separator by utilizing well pressure, is directly filled after high-pressure dehydration, and when a tank car is balanced with the well pressure, a compressor is started to carry out pressure supplementing process for recycling.
When a part of gas wells contain more condensate, the method shown in fig. 1 can cause too much liquid accumulation in the tank car, greatly reduce the transportation efficiency of the CNG tank car, and cause damage or even no use to gas equipment of downstream users. In this case, as shown in FIG. 2, it is common to carry out a process of subjecting the oil-containing natural gas to a separator and a dehydration apparatus, then subjecting the natural gas to a dealkylation treatment by reducing the pressure of the natural gas to a pressure suitable for the dealkylation, and then pressurizing the dry gas to charge the dry gas into the tank car.
When the prior art is recycled for a gas well containing more condensate liquid, the main problems are that the equipment for preparing CNG products, particularly the related equipment for removing hydrocarbons from natural gas, is more, the occupied area is large, and meanwhile, the well pressure cannot be fully utilized to realize direct filling, so that the system energy consumption is large and the overall operation cost is high.
Disclosure of Invention
The invention provides a high-pressure natural gas dealkylation device for solving the problems. The device has the advantages of simple process flow, full utilization of well pressure to realize direct charging, low system energy consumption and low overall operation cost.
The technical scheme adopted by the invention is as follows:
a high-pressure natural gas dealkylation device comprises a pre-separator, a first adsorption tower, a second adsorption tower and a dust filter, and is characterized in that:
arranging a first pipeline comprising two valves V, wherein one end of the first pipeline is connected with the front end of the first adsorption tower, and the other end of the first pipeline is connected with the front end of the second adsorption tower;
the two valves V of the first pipeline are connected with a pre-separator through a pipeline, and the pre-separator is connected with the air inlet 1 through a pipeline;
arranging a second pipeline comprising two valves V, wherein one end of the second pipeline is connected with the rear end of the first adsorption tower, and the other end of the second pipeline is connected with the rear end of the second adsorption tower;
and the two valves V of the second pipeline are connected with a dust filter through a pipeline, and the dust filter is connected with the air outlet through a pipeline.
Furthermore, a third pipeline comprising two valves V is arranged, two ends of the third pipeline are connected with two ends of the first pipeline in parallel, a fourth pipeline comprising two valves V is arranged, two ends of the fourth pipeline are connected with two ends of the second pipeline in parallel, a fifth pipeline comprising two valves V is arranged, and two ends of the fifth pipeline are connected with the second pipeline and the fourth pipeline in parallel;
arranging a sixth pipeline, wherein one end of the sixth pipeline is connected with a pipeline between two valves V of the first pipeline, and the other end of the sixth pipeline is connected with a pipeline between two valves V of the fourth pipeline;
a seventh pipeline is arranged, one end of the seventh pipeline is connected with a pipeline between two valves V of the third pipeline, and the other end of the seventh pipeline is sequentially connected with a regenerative air cooler, a refrigerator and an oil-gas separator in series through pipelines;
an eighth pipeline is arranged, one end of the eighth pipeline is connected with a pipeline between the two valves V of the fifth pipeline, and the other end of the eighth pipeline is sequentially connected with the electric heater, the circulating compressor and the oil-gas separator in series through pipelines.
Furthermore, a pressure relief vent is arranged and is connected with a sixth pipeline through a pipeline.
The work flow of the technical scheme of the invention comprises an adsorption flow and a regeneration flow.
The first adsorption tower adsorption process:
the raw gas enters from the gas inlet, sequentially passes through the preposed separator and the corresponding valve V of the first pipeline through the pipeline, enters the first adsorption tower for dealkylation, and the dealkylated natural gas is sequentially conveyed to the gas outlet through the corresponding valve V of the second pipeline and the dust filter through the pipeline.
A first adsorption tower regeneration process:
first, the corresponding valve V of the first line is closed to terminate the adsorption process.
Secondly, a part of raw material gas is provided as medium gas of the regeneration process. The raw material gas enters from the gas inlet, sequentially passes through the pre-separator and the corresponding valve V of the fourth pipeline through the pipeline and enters the rear end of the first adsorption tower, and the corresponding valve V of the fourth pipeline is closed when the raw material gas volume entering the regeneration process meets the requirement. When the pressure of the medium gas is too high, the pressure can be reduced to a suitable value by opening the pressure relief vent.
Secondly, the regeneration process is operated circularly. The medium gas is led to the front end of the first adsorption tower from the rear end of the first adsorption tower to run, enters a seventh pipeline through a corresponding valve V of the third pipeline, sequentially passes through a regenerative air cooler, a refrigerator and an oil-gas separator in the seventh pipeline, enters a circulating compressor and an electric heater in an eighth pipeline, and finally enters the rear end of the first adsorption tower again through a corresponding valve V of the fifth pipeline to run in a circulating mode.
The working flow of the second adsorption tower is the same as the principle of the first adsorption tower, and the description is not repeated here.
The process mainly comprises the steps of heating medium gas by an electric heater, enabling the hot medium gas to enable light oil on an adsorbent in an adsorption tower to be heated, vaporized and carried out, cooling the medium gas containing oil by an air cooler to about minus five degrees, separating out the light oil, separating and removing the separated out light oil by an oil-gas separator, enabling the medium gas to be purified and obtain the capacity of carrying oil again, and providing a power source for a regeneration process by a circulating compressor to enable the medium gas to be recycled. Light oil in the adsorbent is gradually taken away in the process until the adsorption performance of the adsorbent is recovered, and the regeneration function of the adsorption tower is realized.
The technical scheme of the invention has the following advantages:
1. the process flow is simple, a plurality of large-scale units such as refrigeration, fractionation, heat exchange and the like are omitted, and only a small air cooler, an electric heater and an oil-gas separator are used in the regeneration flow, so that the equipment is highly integrated and skid-mounted, the manufacturing cost of the device is low, the occupied area is reduced, and the energy consumption of the system is reduced.
2. Well pressure is fully utilized, pressure reduction treatment is not needed, and dealkylation treatment can be carried out under a high-pressure state to realize direct charging.
3. The adsorption material can be regenerated and recycled, the loss of the adsorption material is reduced, the production and operation cost is reduced, meanwhile, 2 or more groups of adsorption towers can continuously perform adsorption and dealkylation treatment on the feed gas, and the dealkylation rate of the device is improved.
Drawings
FIG. 1 is a conventional high pressure natural gas recovery flow diagram;
FIG. 2 is a flow diagram of a conventional high pressure natural gas dealkylation recovery scheme;
FIG. 3 is a flow diagram of the high pressure natural gas dealkylation recovery process of the present invention;
FIG. 4 is a flow diagram of an embodiment 1 of a high pressure natural gas dealkylation apparatus according to the present invention;
FIG. 5 is a flow diagram of example 2 of a high pressure natural gas dealkylation plant according to the present invention.
Detailed Description
In order to make the present invention more clear, a high pressure natural gas dealkylation apparatus according to the present invention will be further described with reference to the accompanying drawings, and the specific examples described herein are only for the purpose of illustrating the present invention and are not intended to limit the present invention.
As shown in fig. 3, the present embodiment is disposed between the high pressure dehydration and the CNG tanker.
Example 1:
as shown in fig. 4, a high-pressure natural gas dealkylation apparatus includes a pre-separator 2, a first adsorption tower 4, a second adsorption tower 5, and a dust filter 12.
A first pipeline A comprising two valves V is arranged, one end of the first pipeline A is connected with the front end of the first adsorption tower 4, and the other end of the first pipeline A is connected with the front end of the second adsorption tower 5.
The two valves V of the first pipeline A are connected with the pre-separator 2 through a pipeline, and the pre-separator 2 is connected with the air inlet 1 through a pipeline.
A second pipeline B comprising two valves V is arranged, one end of the second pipeline B is connected with the rear end of the first adsorption tower 4, and the other end of the second pipeline B is connected with the rear end of the second adsorption tower 5.
And the two valves V of the second pipeline B are connected with a dust filter 12 through a pipeline, and the dust filter 12 is connected with an air outlet 13 through a pipeline.
Example 2:
the same points as those in embodiment 1 are not repeated here, but the following points are different:
as shown in fig. 5, a third pipeline C including two valves V is provided, two ends of the third pipeline C are connected in parallel with two ends of the first pipeline a, a fourth pipeline D including two valves V is provided, two ends of the fourth pipeline D are connected in parallel with two ends of the second pipeline B, a fifth pipeline E including two valves V is provided, and two ends of the fifth pipeline E are connected in parallel with the second pipeline B and the fourth pipeline D.
And a sixth pipeline F is arranged, one end of the sixth pipeline F is connected with the pipeline between the two valves V of the first pipeline A, and the other end of the sixth pipeline F is connected with the pipeline between the two valves V of the fourth pipeline D.
And a seventh pipeline G is arranged, one end of the seventh pipeline G is connected with a pipeline between two valves V of the third pipeline C, the other end of the seventh pipeline G is sequentially connected with a regenerative air cooler 6, a refrigerator 7 and an oil-gas separator 8 in series through pipelines, and the oil-gas separator 8 is connected with an oil discharge port 9 through a pipeline provided with a valve V.
An eighth pipeline H is arranged, one end of the eighth pipeline H is connected with a pipeline between the two valves V of the fifth pipeline E, and the other end of the eighth pipeline H is sequentially connected with an electric heater 11, a circulating compressor 10 and an oil-gas separator 8 in series through pipelines.
A pressure relief vent 14 is provided, the pressure relief vent 14 being connected to the sixth line F by a pipe.
Wherein, the adsorbent in the adsorption tower is active carbon, and the main technical indexes of the adsorbent are as follows:
particle size: Φ 3.0mm, particle size: 4mm, specific surface area: 1000 to 1400m2G, apparent density: 450-550 g/L, pore volume: 0.6-0.9 ml/g, strength: 95-98%, water content: 3-5%, C5+ adsorption: 20 to 40 wt%.
The scheme can be used for the high-pressure natural gas dealkylation and also can be used for the medium-low pressure natural gas dealkylation. Carrying out high-pressure natural gas dealkylation, wherein the use pressure is 10-25 MPa.G; and (3) carrying out hydrocarbon removal on the natural gas at the medium and low pressure, wherein the use pressure is 0.5-10 MPa.G.
For the recovery and utilization of the raw gas of the oil-containing high-pressure well, the device can be used as a hydrocarbon removal device of a CNG product; the device can be used as a hydrocarbon removing device of LNG products for purifying natural gas with small gas content and more oil.
The pre-separator 2 in the scheme mainly separates solid and free impurities in the feed gas, plays a role in buffering the feed gas, reduces the load on subsequent equipment and prolongs the service life of the equipment. The activated carbon adsorbent has the advantages of rich micropores, large oil absorption capacity, high strength and the like, and simultaneously has the regeneration cycle usability and reduces the running cost of the device. The hydrocarbon removing device has simple process flow, reduces the occupied area of the device, reduces the manufacturing cost and can realize high integration and skid mounting.
Claims (2)
1. A high-pressure natural gas dealkylation device comprises a pre-separator (2), a first adsorption tower (4), a second adsorption tower (5) and a dust filter (12), and is characterized in that:
a. arranging a first pipeline (A) comprising two valves V, wherein one end of the first pipeline (A) is connected with the front end of a first adsorption tower (4), and the other end of the first pipeline (A) is connected with the front end of a second adsorption tower (5);
b. the two valves V of the first pipeline (A) are connected with the pre-separator (2) through a pipeline, and the pre-separator (2) is connected with the air inlet (1) through a pipeline;
c. a second pipeline (B) comprising two valves V is arranged, one end of the second pipeline (B) is connected with the rear end of the first adsorption tower (4), and the other end of the second pipeline (B) is connected with the rear end of the second adsorption tower (5);
d. and the two valves V of the second pipeline (B) are connected with a dust filter (12) through a pipeline, and the dust filter (12) is connected with an air outlet (13) through a pipeline.
2. The apparatus for high pressure natural gas dealkylation of claim 1, wherein:
a. setting a third pipeline (C) comprising two valves V, wherein two ends of the third pipeline (C) are connected with two ends of the first pipeline (A) in parallel, setting a fourth pipeline (D) comprising two valves V, two ends of the fourth pipeline (D) are connected with two ends of the second pipeline (B) in parallel, setting a fifth pipeline (E) comprising two valves V, and two ends of the fifth pipeline (E) are connected with the second pipeline (B) and the fourth pipeline (D) in parallel;
b. arranging a sixth pipeline (F), wherein one end of the sixth pipeline (F) is connected with a pipeline between two valves V of the first pipeline (A), and the other end of the sixth pipeline (F) is connected with a pipeline between two valves V of the fourth pipeline (D);
c. a seventh pipeline (G) is arranged, one end of the seventh pipeline (G) is connected with a pipeline between two valves V of the third pipeline (C), and the other end of the seventh pipeline (G) is sequentially connected with a regenerative air cooler (6), a refrigerating machine (7) and an oil-gas separator (8) in series through pipelines;
d. an eighth pipeline (H) is arranged, one end of the eighth pipeline (H) is connected with the pipeline between the two valves V of the fifth pipeline (E), and the other end of the eighth pipeline (H) is sequentially connected with an electric heater (11), a circulating compressor (10) and an oil-gas separator (8) in series through pipelines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011272823.1A CN112280605A (en) | 2020-11-14 | 2020-11-14 | High-pressure natural gas dealkylation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011272823.1A CN112280605A (en) | 2020-11-14 | 2020-11-14 | High-pressure natural gas dealkylation device |
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Citations (9)
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|---|---|---|---|---|
| CN1198358A (en) * | 1997-03-06 | 1998-11-11 | 气体产品与化学公司 | Temp.-changing adsorption |
| CN101508923A (en) * | 2009-03-12 | 2009-08-19 | 西安长庆科技工程有限责任公司 | De-heavy hydrocarbon apparatus and process for gas dehydration |
| CN101732942A (en) * | 2010-01-22 | 2010-06-16 | 西安联合超滤净化设备有限公司 | Method for separating heavy hydrocarbon in mixed gas and device thereof |
| CN103071475A (en) * | 2013-01-09 | 2013-05-01 | 西南石油大学 | Natural gas absorbent regeneration and energy conservation technology and device |
| CN103157342A (en) * | 2012-11-09 | 2013-06-19 | 中国科学院理化技术研究所 | Natural gas/coal bed gas absorbent refining method and device with forced heat transferring structure |
| CN203754664U (en) * | 2014-03-14 | 2014-08-06 | 成都华地力普能源工程技术有限公司 | Molecular sieve adsorption device of circularly regenerating natural gas in close manner |
| CN104194852A (en) * | 2014-08-20 | 2014-12-10 | 四川科比科油气工程有限公司 | High-yield light hydrocarbon recovery method from low-pressure natural gas |
| CN106520237A (en) * | 2016-11-10 | 2017-03-22 | 中石化石油工程技术服务有限公司 | Method for removing benzene by adopting molecular sieve |
| US20170233669A1 (en) * | 2014-10-27 | 2017-08-17 | Dow Global Technologies Llc | Temperature controlled adsorption process for recovering condensable components from a gas stream |
-
2020
- 2020-11-14 CN CN202011272823.1A patent/CN112280605A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1198358A (en) * | 1997-03-06 | 1998-11-11 | 气体产品与化学公司 | Temp.-changing adsorption |
| CN101508923A (en) * | 2009-03-12 | 2009-08-19 | 西安长庆科技工程有限责任公司 | De-heavy hydrocarbon apparatus and process for gas dehydration |
| CN101732942A (en) * | 2010-01-22 | 2010-06-16 | 西安联合超滤净化设备有限公司 | Method for separating heavy hydrocarbon in mixed gas and device thereof |
| CN103157342A (en) * | 2012-11-09 | 2013-06-19 | 中国科学院理化技术研究所 | Natural gas/coal bed gas absorbent refining method and device with forced heat transferring structure |
| CN103071475A (en) * | 2013-01-09 | 2013-05-01 | 西南石油大学 | Natural gas absorbent regeneration and energy conservation technology and device |
| CN203754664U (en) * | 2014-03-14 | 2014-08-06 | 成都华地力普能源工程技术有限公司 | Molecular sieve adsorption device of circularly regenerating natural gas in close manner |
| CN104194852A (en) * | 2014-08-20 | 2014-12-10 | 四川科比科油气工程有限公司 | High-yield light hydrocarbon recovery method from low-pressure natural gas |
| US20170233669A1 (en) * | 2014-10-27 | 2017-08-17 | Dow Global Technologies Llc | Temperature controlled adsorption process for recovering condensable components from a gas stream |
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