CN220907441U - Liquefied natural gas front-end purification system for aromatic-rich hydrocarbon - Google Patents
Liquefied natural gas front-end purification system for aromatic-rich hydrocarbon Download PDFInfo
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- CN220907441U CN220907441U CN202321544483.2U CN202321544483U CN220907441U CN 220907441 U CN220907441 U CN 220907441U CN 202321544483 U CN202321544483 U CN 202321544483U CN 220907441 U CN220907441 U CN 220907441U
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 27
- 238000000746 purification Methods 0.000 title claims abstract description 19
- 239000004215 Carbon black (E152) Substances 0.000 title claims description 4
- 125000003118 aryl group Chemical group 0.000 title claims description 4
- 229930195733 hydrocarbon Natural products 0.000 title claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 title claims description 4
- 238000001179 sorption measurement Methods 0.000 claims abstract description 120
- 239000007789 gas Substances 0.000 claims abstract description 118
- 230000008929 regeneration Effects 0.000 claims abstract description 56
- 238000011069 regeneration method Methods 0.000 claims abstract description 56
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000428 dust Substances 0.000 claims abstract description 30
- 238000004781 supercooling Methods 0.000 claims abstract description 5
- 230000001172 regenerating effect Effects 0.000 claims abstract 4
- 239000003463 adsorbent Substances 0.000 claims description 42
- 239000007788 liquid Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 38
- 239000003345 natural gas Substances 0.000 abstract description 19
- 238000004064 recycling Methods 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 14
- 238000010926 purge Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- Separation Of Gases By Adsorption (AREA)
Abstract
The utility model relates to a liquefied natural gas front-end purification system for enriching aromatic hydrocarbons, which comprises a purification mechanism and a regeneration mechanism, wherein the purification mechanism comprises a primary adsorption tower, a secondary adsorption tower and a dust filter which are arranged in parallel, and the regeneration mechanism comprises a preheating heat exchanger, a regenerated gas heater, a regenerated gas cooler, a precooling heat exchanger provided with three precooling pipelines, a supercooling heat exchanger, an aromatic hydrocarbon separator, a free water separator and a regenerated gas circulating compressor. The purifying mechanism is used for filtering water and aromatic hydrocarbon in the liquefied natural gas, and the regenerating mechanism is used for recycling the natural gas output by the purifying mechanism as regenerated gas. The utility model can efficiently remove trace water and aromatic hydrocarbon in the natural gas so as to ensure the stable operation of the liquefied natural gas device, and is also provided with a regeneration mechanism, thereby ensuring the recycling of the regenerated gas, ensuring the heat energy exchange in the recycling process of the regenerated gas, reducing the heat energy waste and improving the energy efficiency utilization rate.
Description
Technical Field
The utility model belongs to the field of natural gas treatment equipment, and particularly relates to a liquefied natural gas front-end purification system for aromatic-rich hydrocarbon.
Background
The natural gas is often blocked by the liquefied natural gas cold box due to the existence of moisture and aromatic hydrocarbon, and the leakage of the plate-fin heat exchanger in the cold box is caused when serious, so that the stability of the liquefied natural gas device is greatly influenced. At present, the front-end purification system of the common liquefied natural gas device cannot remove impurities such as water, aromatic hydrocarbon and the like at the same time. Due to different geological conditions, the components of the raw natural gas are different, and when aromatic hydrocarbons exist in the raw natural gas, the liquefied natural gas device is often frozen and blocked, so that the long-term stable operation of the liquefied natural gas device is seriously influenced.
Disclosure of utility model
The present utility model aims to overcome the above-mentioned disadvantages of the prior art and thereby provide a front-end purification system for liquefied natural gas rich in aromatic hydrocarbons.
The technical scheme adopted for solving the technical problems is as follows:
The utility model provides a liquefied natural gas front end clean system for being rich in aromatic hydrocarbon, including purifying mechanism and regeneration mechanism, purifying mechanism includes air inlet pipe (20), first order adsorption tower (1) and first order adsorption tower (2) that are parallelly connected to set up and are provided with adsorbent regeneration pipeline, second grade adsorption tower (4) and second grade adsorption tower (5) that are parallelly connected to set up and are provided with adsorbent regeneration pipeline, dust filter one (3), dust filter two (6) and gas outlet pipe (26), air inlet pipe (20) connect the air inlet of first order adsorption tower (1) and first order adsorption tower (2) respectively, the air inlet of dust filter one (3) is connected to the gas outlet of first order adsorption tower (1) and first order adsorption tower (2), the air inlet of dust filter one (3) is connected respectively to the gas outlet of second order adsorption tower (4) and second order adsorption tower (5), the air inlet of dust filter two (6) is connected to the gas outlet of dust filter two (6), the gas outlet of dust filter two (6) is connected with gas outlet pipe (26); the regeneration mechanism comprises a preheating heat exchanger (7) and a preheating heat exchanger (14) which are provided with two heat exchange pipelines, a regenerated gas heater (8) and a regenerated gas heater (15), a regenerated gas cooler (9) and a regenerated gas cooler (16), a pre-cooling heat exchanger (10) which is provided with three pre-cooling pipelines, a supercooling heat exchanger (11), an aromatic hydrocarbon separator (12), an aromatic hydrocarbon discharge pipeline (35), a free water separator (17), a regenerated gas circulating compressor (18) and a free water discharge pipeline (49), an air outlet of a dust filter II (6) is connected with one heat exchange pipeline of the preheating heat exchanger (7) through a regenerated gas inlet pipeline (27), the other end of the heat exchange pipeline is connected with an air inlet of the regenerated gas heater (8) through a connecting pipeline (28), an air outlet of the regenerated gas heater (8) is respectively connected with one ends of adsorbent regeneration pipelines in a secondary adsorption tower (4) and a secondary adsorption tower (5) through a connecting pipeline (29), the other ends of the adsorbent regeneration pipelines in the secondary adsorption tower (4) and the secondary adsorption tower (5) are connected with one end of the other heat exchange pipeline (9) through a connecting pipeline (30), the other end of the other heat exchange pipeline is connected with the air inlet of the regenerated gas heater (9) through the connecting pipeline (9), the other end of the precooling pipeline is connected with an air inlet of an aromatic hydrocarbon separator (12), a liquid outlet of the aromatic hydrocarbon separator (12) is connected with one end of another precooling pipeline, and the other end of the precooling pipeline is connected with an aromatic hydrocarbon discharge pipeline (35); the gas outlet of the aromatic hydrocarbon separator (12) is connected with one end of a final precooling pipeline, the other end of the precooling pipeline is connected with one end of one heat exchange pipeline of the preheating heat exchanger (14) through a connecting pipeline (40), the other end of the heat exchange pipeline is connected with a gas inlet of the regenerated gas heater (15) through a connecting pipeline (41) and a connecting pipeline (43), the gas outlet of the regenerated gas heater (15) is respectively connected with one ends of adsorbent regeneration pipelines in the first-stage adsorption tower (1) and the first-stage adsorption tower (2) through a connecting pipeline (45), the other ends of adsorbent regeneration pipelines in the first-stage adsorption tower (1) and the first-stage adsorption tower (2) are connected with the other heat exchange pipeline of the preheating heat exchanger (14) through a connecting pipeline (46), the other ends of the heat exchange pipeline are connected with the gas inlet of the regenerated gas cooler (16), the gas outlet of the regenerated gas cooler (16) is connected with the gas inlet of the free water separator (17), the liquid outlet of the free water separator (17) is connected with the free water discharging pipeline (49), the gas outlet of the free water separator (17) is connected with the gas inlet of the regenerated gas circulation compressor (18), and the gas outlet of the air circulation compressor (18) is connected with the gas inlet of the gas circulation compressor (20).
Further, the connecting pipeline (40) is connected with the connecting pipeline (41) through the connecting pipeline (42), and a program control valve (78) is arranged on the connecting pipeline (42).
Further, the connecting pipeline (45) is connected with the connecting pipeline (43) through the connecting pipeline (44), and the connecting pipeline (44) is provided with a program control valve (80).
Further, the second dust filter (6) is also connected with the connecting pipeline (28) through the connecting pipeline eleven (90), and a program control valve (69) is arranged on the connecting pipeline eleven (90).
Further, the connecting pipeline (28) is also connected with the connecting pipeline (29) through a connecting pipeline twelve (91), and a program control valve (72) is arranged on the connecting pipeline twelve (91).
Further, the program control valve (61) is arranged outside the air inlet of the primary adsorption tower (1), the program control valve (62) is arranged outside the air inlet of the primary adsorption tower (2), the program control valve (63) is arranged outside the air outlet of the primary adsorption tower (1), the program control valve (64) is arranged outside the air outlet of the primary adsorption tower (2), the program control valve (65) is arranged outside the air inlet of the secondary adsorption tower (4), the program control valve (66) is arranged outside the air inlet of the secondary adsorption tower (5), the program control valve (67) is arranged outside the air outlet of the secondary adsorption tower (4), the program control valve (70) is arranged on the regenerated gas inlet pipeline (27), the program control valve (71) is arranged on the connecting pipeline (28), the program control valve (73) is arranged between the connecting pipeline (29) and the adsorbent regeneration pipeline of the secondary adsorption tower (4), the program control valve (74) is arranged between the connecting pipeline (29) and the adsorbent regeneration pipeline of the secondary adsorption tower (5), the program control valve (30) is arranged between the connecting pipeline (30) and the adsorbent regeneration pipeline (75) of the secondary adsorption tower (4), the program control valve (76) is arranged between the connecting pipeline (30) and the adsorbent regeneration pipeline (76), be provided with program control valve (86) on aromatic hydrocarbon exhaust pipe (35), be provided with program control valve (77) on connecting pipe (40), be provided with program control valve (79) on connecting pipe (43), be provided with program control valve (81) between connecting pipe (45) and the adsorbent regeneration line of one-level adsorption tower (1), be provided with program control valve (82) between the adsorbent regeneration line of connecting pipe (45) and one-level adsorption tower (2), be provided with program control valve (83) between the adsorbent regeneration line of connecting pipe (46) and one-level adsorption tower (1), be provided with program control valve (84) between the adsorbent regeneration line of connecting pipe (46) and one-level adsorption tower (2), be provided with program control valve (85) on free water exhaust pipe (49).
Compared with the prior art, the utility model has the following advantages and effects:
1) The trace water and aromatic hydrocarbon in the natural gas can be efficiently removed, so that the stable operation of the liquefied natural gas device is ensured;
2) The regeneration mechanism is arranged, so that the recycling of the regenerated gas is guaranteed, meanwhile, the heat energy exchange can be guaranteed in the recycling process of the regenerated gas, the heat energy waste is reduced, and the energy efficiency utilization rate is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment.
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application.
Detailed Description
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings.
Examples
As shown in fig. 1, the front-end purification system for liquefied natural gas rich in aromatic hydrocarbons is composed of a purification mechanism and a regeneration mechanism. The purification mechanism is used for filtering out water and aromatic hydrocarbon in the liquefied natural gas to obtain the natural gas meeting the use standard. The purification mechanism comprises an air inlet pipeline 20, a first-stage adsorption tower 1 and a second-stage adsorption tower 2 which are arranged in parallel and provided with an adsorbent regeneration pipeline, a second-stage adsorption tower 4 and a second-stage adsorption tower 5 which are arranged in parallel and provided with an adsorbent regeneration pipeline, a dust filter 3, a dust filter 6 and an air outlet pipeline 26. Specifically, the air inlet pipeline 20 is respectively connected with the air inlets of the first-stage adsorption tower 1 and the second-stage adsorption tower 2, the air outlets of the first-stage adsorption tower 1 and the second-stage adsorption tower 2 are connected with the air inlet of the first dust filter 3, the air outlets of the first dust filter 3 are respectively connected with the air inlets of the first second-stage adsorption tower 4 and the second-stage adsorption tower 5, the air outlets of the first-stage adsorption tower 4 and the second-stage adsorption tower 5 are connected with the air inlet of the second dust filter 6, and the air outlet of the second dust filter 6 is connected with the air outlet pipeline 26. The working flow of the purifying mechanism comprises: raw natural gas from upstream after CO 2 removal enters a purification mechanism through an air inlet pipeline 20, firstly, the moisture in the natural gas is removed through a first-stage adsorption tower 1 and a second-stage adsorption tower 2 which are arranged in parallel, the natural gas after the moisture removal is output to a dust filter 3 through the first-stage adsorption tower 1 and the second-stage adsorption tower 2 for dust filtration of a first stage, then the natural gas enters a second-stage adsorption tower 4 and a second-stage adsorption tower 5 which are arranged in parallel for removing aromatic hydrocarbon in the natural gas, and the removed natural gas is filtered for a second time through a dust filter 6 and is discharged into a liquefied cold box at the rear end through an air outlet pipeline 26 as purified natural gas.
As shown in fig. 1, the regeneration mechanism includes a first preheating heat exchanger 7 and a second preheating heat exchanger 14 each provided with two heat exchange pipes, a first regeneration gas heater 8 and a second regeneration gas heater 15, a first regeneration gas cooler 9 and a second regeneration gas cooler 16, a pre-cooling heat exchanger 10 provided with three pre-cooling pipes, a sub-cooling heat exchanger 11, an aromatic hydrocarbon separator 12, an aromatic hydrocarbon discharge pipe 35, a free water separator 17, a regeneration gas circulation compressor 18, and a free water discharge pipe 49. Specifically, the air outlet of the dust filter II 6 is connected with one heat exchange pipeline of the preheating heat exchanger I7 through a regenerated gas inlet pipeline 27, the other end of the heat exchange pipeline is connected with the air inlet of the regenerated gas heater I8 through a connecting pipeline I28, the air outlet of the regenerated gas heater I8 is respectively connected with one end of an adsorbent regeneration pipeline in the second adsorption tower 4 and one end of an adsorbent regeneration pipeline in the second adsorption tower 5 through a connecting pipeline II 29, the other ends of the adsorbent regeneration pipelines in the second adsorption tower 4 and the second adsorption tower 5 are connected with the other heat exchange pipeline of the preheating heat exchanger I7 through a connecting pipeline III 30, the other ends of the heat exchange pipelines are connected with the air inlet of the regenerated gas cooler I9, the air outlet of the regenerated gas cooler I9 is connected with one end of one precooling pipeline, the other ends of the precooling pipeline are connected with the air inlet of the aromatic hydrocarbon separator 12, the liquid outlet of the aromatic hydrocarbon separator 12 is connected with one end of the other precooling pipeline, and the other ends of the precooling pipeline are connected with the aromatic hydrocarbon discharge pipeline 35; the gas outlet of the aromatic hydrocarbon separator 12 is connected with one end of a final precooling pipeline, the other end of the precooling pipeline is connected with one end of one heat exchange pipeline of the preheating heat exchanger II 14 through a connecting pipeline IV 40, the other end of the heat exchange pipeline is connected with the gas inlet of the regenerated gas heater II 15 through a connecting pipeline IV 41 and a connecting pipeline IV 43, the gas outlet of the regenerated gas heater II 15 is respectively connected with one end of an adsorbent regeneration pipeline in the first-stage adsorption tower 1 and the second-stage adsorption tower II 2 through a connecting pipeline IV 45, the other ends of the adsorbent regeneration pipelines in the first-stage adsorption tower 1 and the second-stage adsorption tower II are connected with the other heat exchange pipeline of the preheating heat exchanger II 14 through a connecting pipeline IV 46, the other ends of the heat exchange pipelines are connected with the gas inlet of the regenerated gas cooler II 16, the gas outlet of the regenerated gas cooler II 16 is connected with the gas inlet of the free water separator 17, the liquid outlet of the free water separator 17 is connected with the free water discharge pipeline 49, the gas outlet of the free water separator 17 is connected with the gas inlet of the regenerated gas circulation compressor 18, and the gas outlet of the regenerated gas circulation compressor 18 is connected with the gas inlet pipeline 20. The work flow of the regeneration mechanism comprises: the purified natural gas after secondary filtration through the dust filter II 6 is separated into a strand as regenerated gas, the regenerated gas enters a pipeline 27 through a preheating heat exchanger I7 to be subjected to primary heat exchange with another high-temperature gas, then enters a regenerated gas heater I8 to be added into a designated temperature, the high-temperature regenerated gas enters an adsorbent regeneration pipeline in a secondary adsorption tower I4 and a secondary adsorption tower II 5 through an adsorbent regeneration pipeline in the secondary adsorption tower II, the adsorbents in the secondary adsorption towers I4 and the secondary adsorption tower II 5 are heated and regenerated, aromatic hydrocarbons in the adsorbents are taken away, the regenerated gas rich in the aromatic hydrocarbons is led out from the secondary adsorption towers I4 and the secondary adsorption tower II 5, is subjected to primary heat exchange with the regenerated gas which passes through the preheating heat exchanger I7 and the regeneration gas which passes through before, then is subjected to primary cooling through a regenerated gas cooler I9, and finally is subjected to temperature exchange through a pre-cooling heat exchanger 10, separating aromatic hydrocarbon from natural gas by an aromatic hydrocarbon separator 12 after secondary cooling by a supercooling heat exchanger 11, wherein the liquefied aromatic hydrocarbon is discharged from the bottom of the aromatic hydrocarbon separator 12, rewarmed by a precooling heat exchanger 10, the rewarmed aromatic hydrocarbon is discharged by an aromatic hydrocarbon discharge pipeline 35, the natural gas after further separation of the aromatic hydrocarbon is output from the top of the aromatic hydrocarbon separator 12, the natural gas enters a regenerated gas heater II 15 for heating the regenerated gas after primary heat exchange by a preheating heat exchanger II 14 and another high-temperature gas, the high-temperature regenerated gas takes away moisture in the adsorbent after passing through a first-stage adsorption tower I1 and a second-stage adsorption tower II 2, then passes through a regenerated gas cooler I9 for cooling after primary heat exchange by the preheating heat exchanger II 14 and the regenerated gas passing through before, after the free water is separated by the free water separator 17, the free water is pressurized by the regeneration gas circulation compressor 18 and then is led back to the air intake pipe 20 to form a circulation, and the free water separated from the free water separator 17 is discharged by the free water discharge pipe 49.
In the present embodiment, as shown in fig. 1, the fourth connecting pipe 40 is connected to the fifth connecting pipe 41 through the sixth connecting pipe 42, and the eighteen programmable valves 78 are disposed on the sixth connecting pipe 42. The connecting pipeline nine 45 is connected with the connecting pipeline seven 43 through the connecting pipeline eight 44, and the connecting pipeline eight 44 is provided with a program control valve twenty 80. The dust filter II 6 is also connected with the connecting pipeline I28 through a connecting pipeline eleven 90, and a program control valve nine 69 is arranged on the connecting pipeline eleven 90. The first connecting pipeline 28 is also connected with the second connecting pipeline 29 through a twelve connecting pipeline 91, and a twelve programmable valve 72 is arranged on the twelve connecting pipeline 91. In addition, the first-stage adsorption tower 1 is provided with the first programmable valve 61 outside the air inlet, the second-stage adsorption tower 2 is provided with the second programmable valve 62 outside the air inlet, the first-stage adsorption tower 1 is provided with the third programmable valve 63 outside the air outlet, the second-stage adsorption tower 2 is provided with the fourth programmable valve 64 outside the air outlet, the first-stage adsorption tower 4 is provided with the fifth programmable valve 65 outside the air inlet, the second-stage adsorption tower 5 is provided with the sixth programmable valve 66 outside the air inlet, the first-stage adsorption tower 4 is provided with the seventh programmable valve 67 outside the air outlet, the second-stage adsorption tower 5 is provided with the eighth programmable valve 68 outside the air outlet, the regeneration air inlet pipeline 27 is provided with the tenth programmable valve 70, the first-stage adsorption tower 28 is provided with the eleventh programmable valve 71, the connection pipeline 29 and the second-stage adsorption tower 4 are provided with the thirteenth programmable valve 73 between the adsorbent regeneration pipeline, the connection pipeline 29 and the second-stage adsorption tower 5 are provided with the fourteen programmable valve 74 between the adsorbent regeneration pipeline, the connection pipeline 30 and the second-stage adsorption tower 4 are provided with the fifteen programmable valve 75 between the adsorbent regeneration pipeline, the connection pipeline 30 and the second-stage 5 are provided with the seventeenth programmable valve 46 between the twenty-first-stage pipeline 46 and the seventeenth programmable valve 46, the connection pipeline 46 is provided with the seventeenth programmable valve 82 between the connection pipeline 45 and the connection pipeline 46 is provided with the seventeenth programmable valve 46 between the connection pipeline 46 and the connection pipeline 2 is provided with the connection pipeline 46 between the connection pipeline 1 and the connection pipeline 2 between the connection pipeline and the connection pipeline 2 is provided with the connection pipeline 46. The free water discharge line 49 is provided with a programmable valve twenty-five 85, and the aromatic hydrocarbon discharge line 35 is provided with a programmable valve twenty-sixteen 86. Specifically, after the regeneration mechanism completes high-temperature regeneration of the first-stage adsorption tower 1, the second-stage adsorption tower 2, the first-stage adsorption tower 4 and the second-stage adsorption tower 5, the program control valve eleven 70, the program control valve eleven 71, the program control valve seventeen 77 and the program control valve nineteen 79 are closed, the program control valve nineteen 69, the program control valve twelve 72, the program control valve eighteen 78 and the program control valve twenty 80 are opened, and the regenerated gas directly carries out cooling purging on the first-stage adsorption tower 4 and the second-stage adsorption tower 5 through the program control valve nineteen 69, the program control valve twelve 72, the program control valve thirteenth 73 and the program control valve twenty-four 84; the purged gas sequentially passes through a pre-cooling heat exchanger 7, a regenerated gas cooler I9, a pre-cooling heat exchanger 10 and a supercooling heat exchanger 11, then enters an aromatic hydrocarbon separator 12, and the regenerated gas from the top of the aromatic hydrocarbon separator 12 is subjected to rewarming through the pre-cooling heat exchanger 10 and then enters a first-stage adsorption tower I1 and a second-stage adsorption tower II 2 for cooling and purging through a program-controlled valve eighteen 78, a program-controlled valve twenty 80 and a program-controlled valve twenty-one 81; the purged regenerated gas enters a regeneration gas separator 17 after passing through a preheating heat exchanger II 14 and a regenerated gas cooler II 16, and the separated regenerated gas is led back to an air inlet pipeline 20 to form circulation after being pressurized by a regenerated gas circulating compressor 18, so that the regenerated gas can be recycled.
The foregoing description of the utility model is merely exemplary of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions, without departing from the scope of the utility model as defined in the accompanying claims.
Claims (6)
1. A liquefied natural gas front-end purification system for an aromatic-rich hydrocarbon, characterized by: the purifying device comprises a purifying mechanism and a regenerating mechanism, wherein the purifying mechanism comprises an air inlet pipeline (20), a first-stage adsorption tower I (1) and a second-stage adsorption tower II (2) which are arranged in parallel and are provided with adsorbent regenerating pipelines, a second-stage adsorption tower I (4) and a second-stage adsorption tower II (5) which are arranged in parallel and are provided with adsorbent regenerating pipelines, a dust filter I (3), a dust filter II (6) and an air outlet pipeline (26), the air inlet pipeline (20) is respectively connected with air inlets of the first-stage adsorption tower I (1) and the first-stage adsorption tower II (2), air outlets of the first-stage adsorption tower I (1) and the second-stage adsorption tower II (2) are connected with air inlets of the dust filter I (3), air outlets of the dust filter I (4) and the second-stage adsorption tower II (5) are respectively connected with air inlets of the dust filter II (6), and air outlets of the dust filter II (6) are connected with the air outlet pipeline (26);
the regeneration mechanism comprises a preheating heat exchanger I (7) and a preheating heat exchanger II (14) which are provided with two heat exchange pipelines, a regenerated gas heater I (8) and a regenerated gas heater II (15), a regenerated gas cooler I (9) and a regenerated gas cooler II (16), a precooling heat exchanger (10) which is provided with three precooling pipelines, a supercooling heat exchanger (11), an aromatic hydrocarbon separator (12), an aromatic hydrocarbon discharge pipeline (35), a free water separator (17), a regenerated gas circulating compressor (18) and a free water discharge pipeline (49), the air outlet of a dust filter II (6) is connected with one heat exchange pipeline of the preheating heat exchanger I (7) through a regenerated gas inlet pipeline (27), the other end of the heat exchange pipeline is connected with the air inlet of the regenerated gas heater I (8) through a connecting pipeline I (28), the air outlet of the regenerated gas heater I (8) is respectively connected with one end of the precooling heat exchanger II (29) of the adsorbent in the second adsorption tower I (4) and the second adsorption tower II (5), the other end of the adsorbent in the second adsorption tower II (5) is connected with the air inlet of the other end of the preheating heat exchanger II (9) through the connecting pipeline II, the other end of the regenerated gas heater II (9) is connected with the air inlet of the regenerated gas cooler I (9), the other end of the precooling pipeline is connected with an air inlet of an aromatic hydrocarbon separator (12), a liquid outlet of the aromatic hydrocarbon separator (12) is connected with one end of another precooling pipeline, and the other end of the precooling pipeline is connected with an aromatic hydrocarbon discharge pipeline (35); the gas outlet of the aromatic hydrocarbon separator (12) is connected with one end of a final precooling pipeline, the other end of the precooling pipeline is connected with one end of one heat exchange pipeline of the preheating heat exchanger II (14) through a connecting pipeline IV (40), the other end of the heat exchange pipeline is connected with the gas inlet of the regenerated gas heater II (15) through a connecting pipeline V (41) and a connecting pipeline V (43), the gas outlet of the regenerated gas heater II (15) is respectively connected with one end of an adsorbent regeneration pipeline in the first-stage adsorption tower I (1) and the first-stage adsorption tower II (2) through a connecting pipeline V (45), the other end of the adsorbent regeneration pipeline in the first-stage adsorption tower I (1) and the first-stage adsorption tower II (2) is connected with the other heat exchange pipeline of the preheating heat exchanger II (14) through a connecting pipeline V (46), the other end of the heat exchange pipeline V is connected with the gas inlet of the regenerated gas cooler II (16), the gas outlet of the regenerated gas cooler II (16) is connected with the gas inlet of the free water separator (17), the gas outlet of the free water separator II (17) is connected with the free water discharge pipeline (49), the gas outlet of the free water separator (17) is connected with the gas outlet of the free water discharge pipeline I, and the gas outlet of the free water separator (17) is connected with the gas compressor (18).
2. The lng front-end purification system for aromatics-rich lng according to claim 1, wherein: the fourth connecting pipeline (40) is connected with the fifth connecting pipeline (41) through a sixth connecting pipeline (42), and a program control valve eighteen (78) is arranged on the sixth connecting pipeline (42).
3. The lng front-end purification system for aromatics-rich lng according to claim 1, wherein: the connecting pipeline nine (45) is connected with the connecting pipeline seven (43) through the connecting pipeline eight (44), and the connecting pipeline eight (44) is provided with a program control valve twenty (80).
4. The lng front-end purification system for aromatics-rich lng according to claim 1, wherein: the dust filter II (6) is also connected with the connecting pipeline I (28) through a connecting pipeline II (90), and a program control valve III (69) is arranged on the connecting pipeline II (90).
5. The lng front-end purification system for aromatics-rich lng according to claim 1, wherein: the first connecting pipeline (28) is also connected with the second connecting pipeline (29) through the twelve connecting pipelines (91), and the twelve connecting pipelines (91) are provided with program control valves (72).
6. The lng front-end purification system for aromatics-rich lng according to claim 1, wherein: a first programmable valve (61) is arranged outside an air inlet of a first-stage adsorption tower (1), a second programmable valve (62) is arranged outside an air inlet of a second-stage adsorption tower (2), a third programmable valve (63) is arranged outside an air outlet of the first-stage adsorption tower (1), a fourth programmable valve (64) is arranged outside an air outlet of the second-stage adsorption tower (2), a fifth programmable valve (65) is arranged outside an air inlet of the second-stage adsorption tower (4), a sixth programmable valve (66) is arranged outside an air inlet of the second-stage adsorption tower (5), a seventh programmable valve (67) is arranged outside an air outlet of the second-stage adsorption tower (4), an eighth programmable valve (68) is arranged outside an air outlet of the second-stage adsorption tower (5), a tenth programmable valve (70) is arranged on a regenerated gas inlet pipeline (27), a eleventh programmable valve (71) is arranged on a first connecting pipeline (28), a thirteenth programmable valve (73) is arranged between an adsorbent regeneration pipeline of the second connecting pipeline (29) and the second-stage adsorption tower (4), a sixth programmable valve (67) is arranged between an adsorbent regeneration pipeline of the second connecting pipeline (29) and the second-stage adsorption tower (5), a fifteenth programmable valve (75) is arranged between the connecting pipeline (30), a programmable valve sixteen (76) is arranged between the adsorbent regeneration pipelines of the connecting pipeline III (30) and the second-stage adsorption tower II (5), a programmable valve twenty-six (86) is arranged on the aromatic hydrocarbon discharge pipeline (35), a programmable valve seventeen (77) is arranged on the connecting pipeline IV (40), a programmable valve nineteen (79) is arranged on the connecting pipeline seven (43), a programmable valve twenty-one (81) is arranged between the connecting pipeline nine (45) and the adsorbent regeneration pipeline of the first-stage adsorption tower I (1), a programmable valve twenty-two (82) is arranged between the connecting pipeline nine (45) and the adsorbent regeneration pipeline of the first-stage adsorption tower II (2), a programmable valve twenty-three (83) is arranged between the connecting pipeline ten (46) and the adsorbent regeneration pipeline of the first-stage adsorption tower II (2), a programmable valve twenty-four (84) is arranged between the connecting pipeline ten (46) and the adsorbent regeneration pipeline of the first-stage adsorption tower II (2), and a programmable valve twenty-five (85) is arranged on the free water discharge pipeline (49).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321544483.2U CN220907441U (en) | 2023-06-16 | 2023-06-16 | Liquefied natural gas front-end purification system for aromatic-rich hydrocarbon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321544483.2U CN220907441U (en) | 2023-06-16 | 2023-06-16 | Liquefied natural gas front-end purification system for aromatic-rich hydrocarbon |
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| Publication Number | Publication Date |
|---|---|
| CN220907441U true CN220907441U (en) | 2024-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321544483.2U Active CN220907441U (en) | 2023-06-16 | 2023-06-16 | Liquefied natural gas front-end purification system for aromatic-rich hydrocarbon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220907441U (en) |
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2023
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