CN217479393U - Recovery system for flare emptying gas during overhaul period of oilfield associated gas treatment plant - Google Patents
Recovery system for flare emptying gas during overhaul period of oilfield associated gas treatment plant Download PDFInfo
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- CN217479393U CN217479393U CN202221068162.5U CN202221068162U CN217479393U CN 217479393 U CN217479393 U CN 217479393U CN 202221068162 U CN202221068162 U CN 202221068162U CN 217479393 U CN217479393 U CN 217479393U
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Abstract
The utility model relates to a recovery system of flare blow-down gas during the overhaul period of an oilfield associated gas treatment plant, which comprises a compressor unit sledge, a deep purification sledge and a low-temperature separation stabilization sledge, wherein the compressor unit sledge comprises a feed gas compressor unit and a CNG compressor unit; the deep purification sledge comprises a first adsorption tower, a second adsorption tower, a third adsorption tower, a regenerated gas cooler, a regenerated gas heater, a regenerated gas separator and a gas generator set; the low-temperature separation stabilizing sledge comprises a precooling heat exchanger, a cryogenic heat exchanger, a primary gas-liquid separator, a low-temperature separator, a low-pressure separator, a normal-temperature separator and a mixed hydrocarbon refrigerant compression throttling refrigerating unit. This oil field associated gas treatment plant overhauls during torch unloading gas recovery system realizes carrying out torch gas in the oil field associated gas treatment plant of difference and handles and retrieve, and production heavy hydrocarbon and Compressed Natural Gas (CNG) product create the value for the enterprise, satisfy the environmental protection requirement moreover.
Description
Technical Field
The utility model relates to an oil gas recovery technical field, specifically say, relate to a torch unloading gas recovery system during maintenance of oil field associated gas processing factory.
Background
The oil field associated gas treatment plant is used for producing products such as dry gas, LPG, light oil and the like from oil field associated gas rich in methane, ethane, propane, butane and the components of the methane, the ethane, the propane and the butane through a low-temperature separation method. Every year, the oilfield associated gas treatment plant is stopped for maintenance according to a plan, and the maintenance time is generally 30 days. During the maintenance, a large amount of oil field associated gas will burn through torch system and discharge, and this not only causes the natural gas wasting of resources, can cause the pollution of environment moreover, is not conform to national environmental protection requirement.
The oil field associated gas treatment has long maintenance period and is not suitable for producing hydrocarbon mixture and liquefied natural gas products by adopting conventional oil field associated gas, otherwise, the investment is large, the construction period is long, and the economical efficiency is poor.
In view of the above situation, it is necessary to develop a flare vent gas recovery system used during the overhaul period of an oilfield associated gas treatment plant, which can be used for specifically treating and recovering flare vent gas during the overhaul period of the oilfield associated gas treatment plant, producing heavy hydrocarbon and Compressed Natural Gas (CNG) products, creating value for enterprises, and meeting the environmental protection requirement.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a reasonable in structural design's the oil field associated gas treatment plant maintenance period torch unloading recovery system.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides an oil field associated gas handles torch unloading gas recovery system during factory overhauls which characterized in that: the system comprises a compressor unit skid, a deep purification skid and a low-temperature separation stabilization skid, wherein the compressor unit skid comprises a raw gas compressor unit and a CNG compressor unit; the deep purification sledge comprises a first adsorption tower; the low-temperature separation stabilizing sledge comprises a precooling heat exchanger, a cryogenic heat exchanger, a primary gas-liquid separator, a low-temperature separator, a low-pressure separator and a normal-temperature separator; the interior of the precooling heat exchanger is provided with a channel A1, a channel A2, a channel A3 and a channel A4; the interior of the cryogenic heat exchanger is provided with a channel B1, a channel B2 and a channel B3; the air inlet of feed gas compressor unit is connected with a pipeline that is used for letting in oil field associated gas, and feed gas compressor unit's gas outlet and the bottom air inlet of an adsorption tower pass through No. two pipeline switch-ons, and the top gas outlet of an adsorption tower and the entrance point of passageway A2 of precooling heat exchanger pass through No. three pipeline switch-ons, and the exit end of passageway A2 and one-level vapour and liquid separator's air inlet switch-ons, the bottom liquid outlet of one-level vapour and liquid separator's entrance point passes through No. four pipeline switch-ons with low pressure separator, the top gas outlet of one-level vapour and liquid separator and the passageway B2 of cryogenic heat exchanger pass through No. five pipeline switch-ons, and the exit end of passageway B2 and the entrance point of cryogenic separator pass through No. six pipeline switch-ons, the top gas outlet of cryogenic separator and the passageway B1 switch-on of cryogenic heat exchanger, passageway B1 and passageway A1 switch-on, passageway A1 passes through No. seven pipelines and CNG compressor unit switch-on, a liquid outlet at the bottom of the low-temperature separator is communicated with an inlet end of a channel B3 of the cryogenic heat exchanger through an eighth pipeline, and an outlet end of a channel B3 is communicated with an inlet end of a low-pressure separator; the top gas outlet of low pressure separator and passageway A3's entrance point switch-on, passageway A3's exit end and dry gas discharge pipeline switch-on, the bottom liquid outlet of low pressure separator and passageway A4's entrance point pass through No. nine pipelines switch-ons, and the exit end of passageway A4 and normal temperature separator's entrance point pass through No. ten pipelines switch-ons, normal temperature separator's top gas outlet and dry gas discharge pipeline switch-ons, normal temperature separator's bottom liquid outlet and heavy hydrocarbon product pipeline switch-ons.
Preferably, the deep purification skid further comprises a second adsorption tower, a third adsorption tower, a regenerated gas cooler, a regenerated gas heater, a regenerated gas separator and a gas generator set; the bottom air inlets of the second adsorption tower and the third adsorption tower are communicated with a second pipeline, and the top air outlets of the second adsorption tower and the third adsorption tower are communicated with a third pipeline; a dry gas input pipeline and a heating regeneration gas input pipeline are respectively connected to the top gas outlets of the first adsorption tower, the second adsorption tower and the third adsorption tower, a cooling regeneration gas output pipeline and a heating regeneration gas output pipeline are respectively connected to the bottom gas inlets of the first adsorption tower, the second adsorption tower and the third adsorption tower, the dry gas input pipeline is communicated with a dry gas discharge pipeline, the output end of the cooling regeneration gas output pipeline is connected to a regeneration gas heating main pipeline, the output end of the regeneration gas heating main pipeline is communicated with a heating regeneration gas input pipeline, and the regeneration gas heater is installed on the regeneration gas heating main pipeline; the output end of the heating regenerated gas output pipeline is connected to a regenerated gas cooling main pipeline, the regenerated gas cooler is installed on the regenerated gas cooling main pipeline, the output end of the regenerated gas cooling main pipeline is communicated with a gas inlet of a regenerated gas separator, a bottom liquid outlet of the regenerated gas separator is communicated with a free water output pipeline, and a top gas outlet of the regenerated gas separator is communicated with a gas generator set.
Preferably, the cold energy of the precooling heat exchanger and the cryogenic heat exchanger is provided by a mixed hydrocarbon refrigerant compression throttling refrigerating unit, and the mixed hydrocarbon refrigerant compression throttling refrigerating unit is integrated in a low-temperature separation stabilizing sledge and comprises a refrigerant separator and a refrigerant compressor; the interior of the pre-cooling heat exchanger is also provided with a channel A5, a channel A6 and a channel A7; the interior of the cryogenic heat exchanger is also provided with a channel B4 and a channel B5; the outlet end of the channel A7 is communicated with the inlet end of a refrigerant compressor through a first refrigerant circulation pipeline, the outlet end of the refrigerant compressor is communicated with the inlet of a refrigerant separator through a second refrigerant circulation pipeline, the bottom liquid outlet of the refrigerant separator is communicated with the inlet end of the channel A6 through a third refrigerant circulation pipeline, the outlet end of the channel A6 is communicated with the channel A7 through a fourth refrigerant circulation pipeline, a first throttle valve is installed on the fourth refrigerant circulation pipeline, the top air outlet of the refrigerant separator is communicated with the inlet end of the channel A5 through a fifth refrigerant circulation pipeline, the outlet end of the channel A5 is communicated with the channel B4, the channel B4 is communicated with the channel B5 through a sixth refrigerant circulation pipeline, a second throttle valve is installed on the sixth refrigerant circulation pipeline, and the channel B5 is communicated with the channel A7 through a seventh refrigerant circulation pipeline.
Compared with the prior art, the utility model, have following advantage and effect: this oil field associated gas treatment plant overhauls during torch unloading gas recovery system adopts sled dress formula design, arranges compressor unit sledge, deep purification sledge, the stable sledge of low temperature separation on the sweep that removes, according to the plan, realizes carrying out the torch gas in the oil field associated gas treatment plant of difference and handles and retrieve, produces heavy hydrocarbon and CNG product, for enterprise creation value, satisfies the environmental protection requirement moreover.
Drawings
In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of the reference numerals:
a compressor skid 71; a deep cleaning sledge 72; cryogenic separation stabilization sled 73;
a feed gas compressor train 1; a CNG compressor unit 43; adsorption column 2; a second adsorption column 3; adsorption column three 4; a regeneration gas heater 5; a precooling heat exchanger 6; a cryogenic heat exchanger 7; a first-stage gas-liquid separator 8; a cryogenic separator 9; a low pressure separator 10; a normal temperature separator 11; a refrigerant separator 12; a refrigerant compressor 13; a gas-fired power generator unit 14; a regeneration gas cooler 15; a regeneration gas separator 16; line number one 17; line number two 18; line three 19; line No. four 20; a fifth pipeline 21; number six line 22; line # seven 23; line number eight 24; a dry gas discharge line 25; line No. nine 26; a ten-line 27; heavy hydrocarbon product transfer line 28; a dry gas input line 29; a heating regeneration gas input line 30; a cooling regeneration gas output line 31; a heating regeneration gas output line 32; a regeneration gas heating main line 33; a main regenerative gas cooling line 34; a free water output line 35; the first refrigerant circulation line 36; the second refrigerant circulation line 37; a fifth refrigerant circulation line 38; a third refrigerant circulation line 39; a fourth refrigerant circulation line 40; a seventh refrigerant circulation line 41; and a sixth refrigerant circulation line 42.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, this embodiment discloses a flare blowdown gas recovery system during overhaul of an oilfield associated gas treatment plant, and the recovery system includes a compressor unit skid 71, a deep purification skid 72, and a cryogenic separation stabilization skid 73, which are disposed on a moving vehicle plate, and according to a plan, flare gas treatment and recovery are performed in different oilfield associated gas treatment plants.
In this embodiment, the compressor unit skid 71 includes the feed gas compressor unit 1, the CNG compressor unit 43, and valves, pipes, etc. matching with the feed gas compressor unit and the CNG compressor unit, wherein both the feed gas compressor and the CNG compressor are reciprocating compressors. The raw gas compressor unit 1 is used for compressing raw gas of associated gas in an oil field, and the CNG compressor unit 43 is used for compressing the recovered natural gas to prepare a CNG product.
In this embodiment, the deep purification skid 72 includes a first adsorption tower 2, a second adsorption tower 3, a third adsorption tower 4, a regeneration gas cooler 15, a regeneration gas heater 5, a regeneration gas separator 16, a gas generator set 14, and valves, pipes, etc. associated therewith. The first adsorption tower 2, the second adsorption tower 3 and the third adsorption tower 4 have the same structure, different adsorbents are filled in the first adsorption tower 2, the second adsorption tower 3 and the third adsorption tower 4, and phi 8-phi 6 ceramic balls, A-type silica gel, 3A-type molecular sieves and phi 6-phi 8 ceramic balls are sequentially filled from bottom to top. The deep purification sledge 72 is mainly used for removing saturated water from the oilfield associated gas to achieve the dehydration and drying indexes.
In this embodiment, the cryogenic separation stabilizing skid 73 is mainly used for separating heavy hydrocarbon products, CNG products and dry gas from oilfield associated gas, and includes a pre-cooling heat exchanger 6, a cryogenic heat exchanger 7, a primary gas-liquid separator 8, a cryogenic separator 9, a low-pressure separator 10 and a normal-temperature separator 11, both the pre-cooling heat exchanger 6 and the cryogenic heat exchanger 7 adopt aluminum plate-fin heat exchangers, the pre-cooling heat exchanger 6 is internally provided with a channel a1, a channel a2, a channel A3, a channel a4, a channel a5, a channel a6 and a channel a7, and the cryogenic heat exchanger 7 is internally provided with a channel B1, a channel B2, a channel B3, a channel B4 and a channel B5.
In this embodiment, the air inlet of feed gas compressor unit 1 is connected with a pipeline 17 that is used for letting in oil field associated gas, the gas outlet of feed gas compressor unit 1 is all switched on through No. two pipelines 18 and adsorption tower 2, No. two adsorption towers 3 and No. three adsorption tower 4's bottom air inlet, and the concrete design is divided into three branch road with No. two pipeline 18's output end, and all install the valve on three branch road, be used for controlling oil field associated gas and let in a certain adsorption tower in three adsorption tower.
In this embodiment, the top gas outlets of the first adsorption tower 2, the second adsorption tower 3, and the third adsorption tower 4 are all communicated with the inlet end of the channel a2 of the pre-cooling heat exchanger 6 through a third pipeline 19, and the specific design is that the input starting end of the third pipeline 19 is divided into three branches, and valves are installed on the three branches, so as to control the oil field associated gas dried by one of the three adsorption towers to be introduced into the channel a2 of the pre-cooling heat exchanger 6.
In this embodiment, the outlet end of the channel a2 is communicated with the air inlet of the first-stage gas-liquid separator 8, the bottom liquid outlet of the first-stage gas-liquid separator 8 is communicated with the inlet end of the low-pressure separator 10 through a fourth pipeline 20, the top air outlet of the first-stage gas-liquid separator 8 is communicated with the channel B2 of the cryogenic heat exchanger 7 through a fifth pipeline 21, the outlet end of the channel B2 is communicated with the inlet end of the cryogenic separator 9 through a sixth pipeline 22, the top air outlet of the cryogenic separator 9 is communicated with the channel B1 of the cryogenic heat exchanger 7, the channel B1 is communicated with the channel a1, and the channel a1 is communicated with the CNG compressor unit 43 through a seventh pipeline 23.
In this embodiment, the liquid outlet at the bottom of the cryogenic separator 9 is connected to the inlet end of the passage B3 of the cryogenic heat exchanger 7 through the eight-way pipe 24, and the outlet end of the passage B3 is connected to the inlet end of the low-pressure separator 10.
In this embodiment, the top air outlet of the low-pressure separator 10 is connected to the inlet end of the passage A3, the outlet end of the passage A3 is connected to the dry gas discharge pipeline 25, the bottom liquid outlet of the low-pressure separator 10 is connected to the inlet end of the passage a4 through the No. nine pipeline 26, the outlet end of the passage a4 is connected to the inlet end of the normal-temperature separator 11 through the No. ten pipeline 27, the top air outlet of the normal-temperature separator 11 is connected to the dry gas discharge pipeline 25, and the bottom liquid outlet of the normal-temperature separator 11 is connected to the heavy hydrocarbon product conveying pipeline 28.
In this embodiment, a dry gas input pipeline 29 and a heating regeneration gas input pipeline 30 are connected to the top gas outlets of the first adsorption tower 2, the second adsorption tower 3 and the third adsorption tower 4, and a cooling regeneration gas output pipeline 31 and a heating regeneration gas output pipeline 32 are connected to the bottom gas inlets of the first adsorption tower 2, the second adsorption tower 3 and the third adsorption tower 4.
In this embodiment, the dry gas input pipeline 29 is connected to the dry gas discharge pipeline 25, the output end of the cooling regeneration gas output pipeline 31 is connected to a regeneration gas heating main pipeline 33, the output end of the regeneration gas heating main pipeline 33 is connected to the heating regeneration gas input pipeline 30, and the regeneration gas heater 5 is installed on the regeneration gas heating main pipeline 33.
In this embodiment, the output end of the heating regeneration gas output pipeline 32 is connected to a regeneration gas cooling main pipeline 34, the regeneration gas cooler 15 is installed on the regeneration gas cooling main pipeline 34, the output end of the regeneration gas cooling main pipeline 34 is communicated with the gas inlet of the regeneration gas separator 16, the bottom liquid outlet of the regeneration gas separator 16 is communicated with the free water output pipeline 35, and the top gas outlet of the regeneration gas separator 16 is communicated with the gas generator set 14.
In this embodiment, the low-temperature separation stabilizing sledge 73 is further integrated with a mixed hydrocarbon refrigerant compression throttling refrigeration unit, and the cold energy of the precooling heat exchanger 6 and the cryogenic heat exchanger 7 is provided by the mixed hydrocarbon refrigerant compression throttling refrigeration unit. The mixed hydrocarbon refrigerant adopts a low-pressure refrigerant which is composed of three components of methane, ethylene, isobutane and the like.
In this embodiment, the mixed hydrocarbon refrigerant compression-throttling refrigeration unit includes a refrigerant separator 12 and a refrigerant compressor 13, and the refrigerant compressor 13 is a screw compressor.
In this embodiment, the outlet end of the passage a7 is connected to the inlet end of the refrigerant compressor 13 through the first refrigerant circulation line 36, and the outlet end of the refrigerant compressor 13 is connected to the inlet of the refrigerant separator 12 through the second refrigerant circulation line 37.
The bottom liquid outlet of the refrigerant separator 12 is connected with the inlet end of the passage a6 through a third refrigerant circulation line 39, the outlet end of the passage a6 is connected with the passage a7 through a fourth refrigerant circulation line 40, and a first throttle valve is installed on the fourth refrigerant circulation line 40.
The top air outlet of the refrigerant separator 12 is communicated with the inlet end of the channel a5 through a fifth refrigerant circulation pipeline 38, the outlet end of the channel a5 is communicated with the channel B4, the channel B4 is communicated with the channel B5 through a sixth refrigerant circulation pipeline 42, a second throttle valve is installed on the sixth refrigerant circulation pipeline 42, and the channel B5 is communicated with the channel a7 through a seventh refrigerant circulation pipeline 41.
In this embodiment, the working method of the flare blowdown gas recovery system during the overhaul period of the oilfield associated gas treatment plant is as follows:
the method comprises the following steps: after being pressurized and cooled by a feed gas compressor unit 1, the oilfield associated gas enters one of a first adsorption tower 2, a second adsorption tower 3 or a third adsorption tower 4 to remove saturated water in the oilfield associated gas, so that dehydration and drying indexes are achieved;
step two: the oilfield associated gas dried by the adsorption tower enters a channel A2 of a precooling heat exchanger 6 for precooling, the oilfield associated gas coming out of a channel A2 enters a primary gas-liquid separator 8, liquid coming out of the bottom of the primary gas-liquid separator 8 enters a low-pressure separator 10 after throttling and pressure reduction by a throttle valve, and gas coming out of the top of the primary gas-liquid separator 8 is cooled by a channel B2 of a cryogenic heat exchanger 7 and then enters a low-temperature separator 9;
step three: the gas from the top of the low-temperature separator 9 is rich in methane and ethane, the gas is used as high-pressure dry gas to be reheated through a channel B1 of the cryogenic heat exchanger 7 and a channel A1 of the precooling heat exchanger 6, and the reheated dry gas is compressed into high-pressure natural gas serving as a CNG product by a CNG compressor set 43; the liquid from the bottom of the low-temperature separator 9 is depressurized and cooled by a throttle valve, then passes through a channel B3 of the cryogenic heat exchanger 7 for rewarming, and then enters a low-pressure separator 10;
step four: liquid from the bottom of the low-pressure separator 10 enters the normal-temperature separator 11 after being reheated by a channel A4 of the precooling heat exchanger 6, and the liquid separated from the normal-temperature separator 11 is rich in propane, butane and heavy components above propane and butane and serves as a hydrocarbon mixture product;
step five: the gas from the top of the low-pressure separator 10 is reheated by a channel A3 of the precooling heat exchanger 6 and then mixed with the gas from the top of the normal-temperature separator 11, the mixed gas is used as low-pressure dry gas and enters one of the first adsorption tower 2, the second adsorption tower 3 and the third adsorption tower 4 which is not used as an adsorption tower adsorbent to cool regenerated gas for cooling and blowing, the cooled low-pressure dry gas is heated by a regenerated gas heater 5, the heated low-pressure dry gas enters the first adsorption tower 2, the other of the second adsorption tower 3 and the third adsorption tower 4 is used as heating regeneration gas of an adsorbent in the adsorption tower which is not subjected to adsorption operation, the gas after heating regeneration is cooled by a regeneration gas cooler 15, and the cooled low-pressure dry gas enters a regeneration gas separator 16 to separate free water and is discharged as sewage; the gas from the regeneration gas separator 16 enters a gas generator set 14 to generate power, and the generated power is supplied to the feed gas compressor set 1, the CNG compressor set 43, the regeneration gas heater 5 and the refrigerant compressor 13;
step six: the cold energy of the pre-cooling heat exchanger 6 and the cryogenic heat exchanger 7 is provided by a mixed hydrocarbon refrigerant compression throttling refrigerating unit, low-pressure gas-phase refrigerant is compressed and cooled by a refrigerant compressor 13, pressurized high-pressure refrigerant enters a refrigerant separator 12, liquid from the bottom of the refrigerant separator 12 enters a channel A6 of the pre-cooling heat exchanger 6, the refrigerant from the channel A6 is throttled and refrigerated by a throttling valve, and low-pressure liquid refrigerant returns to a channel A7 of the pre-cooling heat exchanger 6 to provide cold energy for the pre-cooling heat exchanger 6; the high-pressure gas-phase refrigerant coming out of the top of the refrigerant separator 12 is cooled by the precooling heat exchanger 6 and the cryogenic heat exchanger 7, the refrigerant which is changed into liquid is throttled and refrigerated by the throttle valve and returns to the channel B5 of the cryogenic heat exchanger 7 to provide refrigeration for the cryogenic heat exchanger 7, the refrigerant coming out of the channel B5 of the cryogenic heat exchanger 7 enters the channel A7 of the precooling heat exchanger 6 to provide refrigeration for the precooling heat exchanger 6, and the low-pressure gas-phase refrigerant coming out of the channel A7 of the precooling heat exchanger 6 enters the refrigerant compressor 13 again to realize circulating compression refrigeration.
In this embodiment, the first adsorption tower 2, the second adsorption tower 3, and the third adsorption tower 4 adopt a three-tower switching process, for example, when the first adsorption tower 2 is saturated in water, the second adsorption tower 3 is switched to an adsorption state, the third adsorption tower 4 is switched to a cold blowing state, and the first adsorption tower 2 is switched to a heating regeneration state by a program control valve; when the second adsorption tower 3 is saturated in water, the third adsorption tower 4 is switched to an adsorption state, the first adsorption tower 2 is switched to a cold blowing state, and the second adsorption tower 3 is switched to a heating regeneration state through a program control valve; when the adsorption water of the adsorption tower III 4 reaches saturation, the adsorption tower I2 is switched to an adsorption state, the adsorption tower II 3 is switched to a cold blowing state, and the adsorption tower III 4 is switched to a heating regeneration state through the program control valve, so that cyclic adsorption, heating regeneration and cooling are realized.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the patent idea of the utility model are included in the protection scope of the patent of the utility model. Those skilled in the art can modify or supplement the described embodiments or substitute them in a similar manner without departing from the scope of the invention as defined by the claims.
Claims (3)
1. The utility model provides an oil field associated gas handles torch unloading gas recovery system during factory overhauls which characterized in that: comprises a compressor set sledge (71), a deep purification sledge (72) and a low-temperature separation stabilization sledge (73),
the compressor train skid (71) comprises a feed gas compressor train (1) and a CNG compressor train (43);
the deep purification sledge (72) comprises a first adsorption tower (2);
the low-temperature separation stabilizing sledge (73) comprises a precooling heat exchanger (6), a cryogenic heat exchanger (7), a primary gas-liquid separator (8), a low-temperature separator (9), a low-pressure separator (10) and a normal-temperature separator (11);
the interior of the pre-cooling heat exchanger (6) is provided with a channel A1, a channel A2, a channel A3 and a channel A4;
the interior of the cryogenic heat exchanger (7) is provided with a channel B1, a channel B2 and a channel B3;
the gas inlet of the raw gas compressor unit (1) is connected with a first pipeline (17) for introducing oilfield associated gas, the gas outlet of the raw gas compressor unit (1) is communicated with the gas inlet at the bottom of a first adsorption tower (2) through a second pipeline (18), the gas outlet at the top of the first adsorption tower (2) is communicated with the inlet end of a channel A2 of the precooling heat exchanger (6) through a third pipeline (19), the outlet end of the channel A2 is communicated with the gas inlet of a first-stage gas-liquid separator (8),
the bottom liquid outlet of the first-stage gas-liquid separator (8) is communicated with the inlet end of the low-pressure separator (10) through a fourth pipeline (20), the top gas outlet of the first-stage gas-liquid separator (8) is communicated with the channel B2 of the deep cooling heat exchanger (7) through a fifth pipeline (21), the outlet end of the channel B2 is communicated with the inlet end of the low-temperature separator (9) through a sixth pipeline (22),
a top gas outlet of the low-temperature separator (9) is communicated with a channel B1 of the cryogenic heat exchanger (7), a channel B1 is communicated with a channel A1, a channel A1 is communicated with a CNG compressor set (43) through a seventh pipeline (23), a bottom liquid outlet of the low-temperature separator (9) is communicated with an inlet end of a channel B3 of the cryogenic heat exchanger (7) through an eighth pipeline (24), and an outlet end of a channel B3 is communicated with an inlet end of the low-pressure separator (10);
the top air outlet of the low-pressure separator (10) is communicated with the inlet end of the channel A3, the outlet end of the channel A3 is communicated with the dry gas discharge pipeline (25), the bottom liquid outlet of the low-pressure separator (10) is communicated with the inlet end of the channel A4 through a ninth pipeline (26), the outlet end of the channel A4 is communicated with the inlet end of the normal-temperature separator (11) through a tenth pipeline (27),
and a top gas outlet of the normal temperature separator (11) is communicated with a dry gas discharge pipeline (25), and a bottom liquid outlet of the normal temperature separator (11) is communicated with a heavy hydrocarbon product conveying pipeline (28).
2. The flare vent gas recovery system during overhaul of an oilfield associated gas processing plant of claim 1, wherein: the deep purification sledge (72) further comprises a second adsorption tower (3), a third adsorption tower (4), a regenerated gas cooler (15), a regenerated gas heater (5), a regenerated gas separator (16) and a gas generator set (14);
the bottom air inlets of the second adsorption tower (3) and the third adsorption tower (4) are communicated with a second pipeline (18), and the top air outlets of the second adsorption tower (3) and the third adsorption tower (4) are communicated with a third pipeline (19);
a dry gas input pipeline (29) and a heating regeneration gas input pipeline (30) are respectively connected to the top gas outlets of the first adsorption tower (2), the second adsorption tower (3) and the third adsorption tower (4), a cooling regeneration gas output pipeline (31) and a heating regeneration gas output pipeline (32) are respectively connected to the bottom gas inlets of the first adsorption tower (2), the second adsorption tower (3) and the third adsorption tower (4), the dry gas input pipeline (29) is communicated with a dry gas discharge pipeline (25), the output end of the cooling regeneration gas output pipeline (31) is connected to a regeneration gas heating main pipeline (33), the output end of the regeneration gas heating main pipeline (33) is communicated with the heating regeneration gas input pipeline (30), and the regeneration gas heater (5) is installed on the regeneration gas heating main pipeline (33); the output end of the heating regeneration gas output pipeline (32) is connected to a regeneration gas cooling main pipeline (34), the regeneration gas cooler (15) is installed on the regeneration gas cooling main pipeline (34), the output end of the regeneration gas cooling main pipeline (34) is communicated with an air inlet of a regeneration gas separator (16), a liquid outlet at the bottom of the regeneration gas separator (16) is communicated with a free water output pipeline (35), and a gas outlet at the top of the regeneration gas separator (16) is communicated with a gas generator set (14).
3. The flare vent gas recovery system during overhaul of an oilfield associated gas processing plant of claim 1, wherein: the cold energy of the precooling heat exchanger (6) and the cryogenic heat exchanger (7) is provided by a mixed hydrocarbon refrigerant compression throttling refrigerating unit, and the mixed hydrocarbon refrigerant compression throttling refrigerating unit is integrated in a low-temperature separation stabilizing sledge (73) and comprises a refrigerant separator (12) and a refrigerant compressor (13);
the interior of the pre-cooling heat exchanger (6) is also provided with a channel A5, a channel A6 and a channel A7;
the interior of the cryogenic heat exchanger (7) is also provided with a channel B4 and a channel B5;
the outlet end of the passage A7 is communicated with the inlet end of a refrigerant compressor (13) through a first refrigerant circulating pipeline (36), the outlet end of the refrigerant compressor (13) is communicated with the inlet of a refrigerant separator (12) through a second refrigerant circulating pipeline (37), the bottom liquid outlet of the refrigerant separator (12) is communicated with the inlet end of the passage A6 through a third refrigerant circulating pipeline (39), the outlet end of the passage A6 is communicated with the passage A7 through a fourth refrigerant circulating pipeline (40), a first throttle valve is arranged on the fourth refrigerant circulating pipeline (40), the top air outlet of the refrigerant separator (12) is communicated with the inlet end of the passage A5 through a fifth refrigerant circulating pipeline (38), the outlet end of the passage A5 is communicated with the passage B4, the passage B4 is communicated with the passage B5 through a sixth refrigerant circulating pipeline (42), and a second throttle valve is arranged on the sixth refrigerant circulating pipeline (42), the passage B5 is communicated with the passage A7 through a No. seven refrigerant circulating pipeline (41).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221068162.5U CN217479393U (en) | 2022-04-29 | 2022-04-29 | Recovery system for flare emptying gas during overhaul period of oilfield associated gas treatment plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221068162.5U CN217479393U (en) | 2022-04-29 | 2022-04-29 | Recovery system for flare emptying gas during overhaul period of oilfield associated gas treatment plant |
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| CN217479393U true CN217479393U (en) | 2022-09-23 |
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| CN202221068162.5U Active CN217479393U (en) | 2022-04-29 | 2022-04-29 | Recovery system for flare emptying gas during overhaul period of oilfield associated gas treatment plant |
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- 2022-04-29 CN CN202221068162.5U patent/CN217479393U/en active Active
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