CN220432736U - Intrinsic safety skid-mounted scattered natural gas recycling system - Google Patents
Intrinsic safety skid-mounted scattered natural gas recycling system Download PDFInfo
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- CN220432736U CN220432736U CN202321903217.4U CN202321903217U CN220432736U CN 220432736 U CN220432736 U CN 220432736U CN 202321903217 U CN202321903217 U CN 202321903217U CN 220432736 U CN220432736 U CN 220432736U
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title description 16
- 239000003345 natural gas Substances 0.000 title description 8
- 238000004064 recycling Methods 0.000 title description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 152
- 239000002808 molecular sieve Substances 0.000 claims abstract description 151
- 239000007789 gas Substances 0.000 claims abstract description 76
- 229910052751 metal Inorganic materials 0.000 claims abstract description 74
- 239000002184 metal Substances 0.000 claims abstract description 74
- 230000008929 regeneration Effects 0.000 claims abstract description 27
- 238000011069 regeneration method Methods 0.000 claims abstract description 27
- 238000011045 prefiltration Methods 0.000 claims abstract description 24
- 238000007664 blowing Methods 0.000 claims abstract description 22
- 238000005380 natural gas recovery Methods 0.000 claims abstract description 15
- 238000005485 electric heating Methods 0.000 claims abstract description 13
- 238000004880 explosion Methods 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 13
- 238000001179 sorption measurement Methods 0.000 description 12
- 238000001816 cooling Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000010865 sewage Substances 0.000 description 3
- 208000005156 Dehydration Diseases 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The utility model discloses an intrinsically safe skid-mounted scattered natural gas recovery processing system which comprises a pre-filter, a first molecular sieve tower, a second molecular sieve tower, a post-filter, a compressor, an explosion-proof electric heater, an air cooler and a separator, wherein the pre-filter is arranged on the first molecular sieve tower; the inlet of the pre-filter is connected with an incoming gas pipeline, and the outlet of the pre-filter is connected with a top gas inlet pipeline of the first molecular sieve tower; the inlet of the rear filter is connected with the bottom exhaust pipeline of the first molecular sieve tower; the outlet of the explosion-proof electric heater is respectively connected with the bottom exhaust pipelines of the first molecular sieve tower and the bottom exhaust pipeline of the second molecular sieve tower, and the top air inlet pipelines of the first molecular sieve tower and the second molecular sieve tower are sequentially connected with the air cooler and the separator through the regeneration exhaust pipeline; a cold blowing bypass pipeline is also connected between the compressor outlet and the explosion-proof electric heater outlet; the explosion-proof electric heater comprises a double-layer metal shell, wherein a spiral metal coil pipe and a plurality of electric heating pipes are arranged in the double-layer metal shell.
Description
Technical Field
The utility model relates to the technical field of natural gas recovery treatment of scattered natural gas fields, in particular to an intrinsically safe skid-mounted scattered natural gas recovery treatment system.
Background
In a treatment process system of scattered natural gas fields or oilfield associated gas in remote areas, a molecular sieve tower is generally adopted to dehydrate the natural gas, and when the molecular sieve is saturated with water absorption, the molecular sieve tower needs to be regenerated to recover the adsorption capacity of the molecular sieve; in the process of regenerating the molecular sieve, the regenerated gas is heated, and the existing heating equipment generally adopts a direct electric heater as a regenerated gas heater. For the direct electric heater, the electric heating element is not isolated from oil and gas media, and the automatic control and the linkage protection are imperfect;
meanwhile, in the existing scattered natural gas field recovery processing system, because the regenerated gas can only flow back to the molecular sieve tower after being heated by the electric heater, the function of cold blowing and cooling of the molecular sieve tower bed layer cannot be utilized, the utilization efficiency of the regenerated gas is low, the cold blowing and cooling of the molecular sieve tower bed layer cannot be realized, the molecular sieve tower temperature is high and the water adsorption capacity is reduced in the dehydration adsorption process, and the adsorption efficiency of the molecular sieve tower is influenced, so that the skid-mounted scattered natural gas recovery processing system with intrinsic safety is needed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model provides an intrinsically safe skid-mounted scattered natural gas recovery processing system.
The utility model discloses an intrinsically safe skid-mounted scattered natural gas recovery processing system which comprises a pre-filter, a first molecular sieve tower, a second molecular sieve tower, a post-filter, a compressor, an explosion-proof electric heater, an air cooler and a separator, wherein the pre-filter is arranged on the first molecular sieve tower;
the inlet of the pre-filter is connected with an air inlet pipeline, the outlet of the pre-filter is respectively connected with the top air inlet pipeline of the first molecular sieve tower and the top air inlet pipeline of the second molecular sieve tower, the bottom air outlet pipeline of the first molecular sieve tower and the bottom air outlet pipeline of the second molecular sieve tower are respectively connected with the inlet of the post-filter, and the outlet of the post-filter is connected with a dry gas output pipeline;
the outlet of the rear filter is further connected with the compressor and the anti-explosion electric heater in sequence through a regenerated gas main pipeline, the outlet of the anti-explosion electric heater is connected with the bottom exhaust pipeline of the first molecular sieve tower and the bottom exhaust pipeline of the second molecular sieve tower through regenerated gas branch pipelines respectively, the top air inlet pipeline of the first molecular sieve tower and the top air inlet pipeline of the second molecular sieve tower are also connected with the air cooler and the separator through regenerated exhaust pipelines respectively in sequence, and the top discharge pipeline of the separator is connected with the air inlet pipeline; a cold blowing bypass pipeline is also connected between the outlet of the compressor and the outlet of the explosion-proof electric heater; valves are arranged on the top air inlet pipeline, the bottom air outlet pipeline, the regenerated gas main pipeline, the regenerated gas branch pipeline and the cold blowing bypass pipeline;
the anti-explosion electric heater comprises a double-layer metal shell, a spiral metal coil and a plurality of longitudinally arranged electric heating pipes are arranged in the double-layer metal shell, the inlet end of the metal coil stretches out of the double-layer metal shell and then is connected with the outlet of the compressor, and the outlet end of the metal coil stretches out of the double-layer metal shell and then is connected with the regenerated gas branch pipeline.
As a further improvement of the utility model, the sewage treatment device also comprises a sewage pipeline;
the drain outlet of the front filter, the drain outlet of the separator and the drain outlet of the rear filter are all connected with the drain pipeline.
As a further improvement of the utility model, a first valve is arranged at one side of the inlet end of the pre-filter, a second valve is arranged on the top air inlet pipeline of the first molecular sieve tower, and a third valve is arranged on the top air inlet pipeline of the second molecular sieve tower;
a fourth valve is arranged on the bottom exhaust pipeline of the first molecular sieve tower, a fifth valve is arranged on the bottom exhaust pipeline of the second molecular sieve tower, a sixth valve is arranged at the inlet end of the compressor, a seventh valve and an eighth valve are respectively arranged at the inlet end and the outlet end of the explosion-proof electric heater, and a ninth valve is arranged on the cold blowing bypass pipeline;
a tenth valve is arranged on the regenerated gas branch pipeline connected with the bottom exhaust pipeline of the first molecular sieve tower, and an eleventh valve is arranged on the regenerated gas branch pipeline connected with the bottom exhaust pipeline of the second molecular sieve tower;
a twelfth valve is arranged on the regenerated exhaust pipeline connected with the top air inlet pipeline of the first molecular sieve tower, and a thirteenth valve is arranged on the regenerated exhaust pipeline connected with the top air inlet pipeline of the second molecular sieve tower;
and the fourteenth valve and the fifteenth valve are respectively connected to the regeneration exhaust pipeline corresponding to the inlet end and the outlet end of the air preheater.
As a further improvement of the utility model, the double-layer metal shell comprises a first metal shell and a second metal shell, wherein the second metal shell is sleeved outside the first metal shell, and a heat preservation layer is filled between the first metal shell and the second metal shell;
the metal coil is arranged in the first metal shell, and the inlet end and the outlet end of the metal coil extend out of the first metal shell and the second metal shell;
the electric heating pipes are inserted into the inner cavity of the middle part of the metal coil pipe along the vertical direction.
As a further improvement of the utility model, the separator is a vertical sedimentation separator, and a mist catching silk screen is arranged in the vertical sedimentation separator;
the mist-catching wire mesh can catch small liquid drops with the diameter of more than 10 microns.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, through arranging the pre-filter, the first molecular sieve tower, the second molecular sieve tower, the post-filter, the compressor, the explosion-proof electric heater, the air cooler and the separator, the dehydration treatment of scattered natural gas can be realized, and through replacing the heater with the explosion-proof electric heater, the electric heating pipe and the metal coil are arranged in a double-layer metal shell, so that the contact between the electric heating pipe and a heated medium is avoided, the danger caused by the direct contact between the perforation of the electric heating pipe and the heated medium can be effectively avoided, and the regeneration process of the molecular sieve tower is ensured;
according to the utility model, the cold blowing bypass pipeline is added between the main pipelines of the regenerated gas at the inlet end and the outlet end of the explosion-proof electric heater, so that part of the regenerated gas filtered by the post-filter is compressed by the compressor and then directly conveyed into the first molecular sieve tower or the second molecular sieve tower, thereby realizing cooling and cold blowing on the bed temperature in the first molecular sieve tower or the second molecular sieve tower, effectively ensuring the bed temperature in the first molecular sieve tower or the second molecular sieve tower, avoiding the reduction of adsorption capacity caused by overhigh temperature of the first molecular sieve tower or the second molecular sieve tower and improving the adsorption efficiency of the molecular sieve tower;
according to the utility model, the front filter, the first molecular sieve tower, the second molecular sieve tower, the rear filter, the compressor, the explosion-proof electric heater, the air cooler and the separator form a matched integrated skid-mounted device, so that the requirement of quick relocation of a field device is met while the normal and safe production and operation of a gas field are ensured.
Drawings
FIG. 1 is a schematic process flow diagram of an intrinsically safe skid-mounted scattered natural gas recovery processing system according to one embodiment of the present utility model;
fig. 2 is a schematic structural diagram of an explosion-proof electric heater of an intrinsically safe skid-mounted scattered natural gas recovery processing system according to an embodiment of the present utility model.
In the figure:
1. a pre-filter; 2-1, a first molecular sieve tower; 2-2, a second molecular sieve tower; 3. a post filter; 4. a compressor; 5. an explosion-proof electric heater; 5-1, a first metal shell; 5-2, a second metal shell; 5-3, a metal coil; 5-31, the inlet end of the metal coil; 5-32, the outlet end of the metal coil; 5-4, an electric heating tube; 5-5, an insulating layer; 5-6, junction box; 6. an air cooler; 7. a separator; 8-1, a first valve; 8-2, a second valve; 8-3, a third valve; 8-4, a fourth valve; 8-5, a fifth valve; 8-6, a sixth valve; 8-7, a seventh valve; 8-8, an eighth valve; 8-9, a ninth valve; 8-10, tenth valve; 8-11, eleventh valve; 8-12, a twelfth valve; 8-13, thirteenth valve; 8-14, a fourteenth valve; 8-15, fifteenth valve; 8-16, sixteenth valve; 9. an incoming gas pipeline; 10. a top inlet duct of the first molecular sieve column; 11. a top inlet duct of the second molecular sieve column; 12. a bottom exhaust duct of the first molecular sieve column; 13. a bottom exhaust duct of the second molecular sieve column; 14. a main regenerated gas pipeline; 15. a regeneration gas branch pipeline; 16. a regeneration exhaust line; 17. a top discharge conduit; 18. a cold blow bypass pipeline; 19. a sewage drain pipe; 20. dry gas delivery pipeline.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The utility model is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1, the skid-mounted scattered natural gas recovery processing system provided by the utility model comprises a pre-filter 1, a first molecular sieve tower 2-1, a second molecular sieve tower 2-2, a post-filter 3, a compressor 4, an explosion-proof electric heater 5, an air cooler 6 and a separator 7; the inlet of the pre-filter 1 is connected with an air inlet pipeline 9, the outlet of the pre-filter 1 is respectively connected with a top air inlet pipeline 10 of the first molecular sieve tower and a top air inlet pipeline 11 of the second molecular sieve tower, a bottom air outlet pipeline 12 of the first molecular sieve tower and a bottom air outlet pipeline 13 of the second molecular sieve tower are respectively connected with the inlet of the post-filter 3, and the outlet of the post-filter 3 is connected with a dry gas output pipeline 20; the outlet of the post filter 3 is also connected with the compressor 4 and the explosion-proof electric heater 5 in sequence through a regenerated gas main pipeline 14, the outlet of the explosion-proof electric heater 5 is connected with a bottom exhaust pipeline 12 of the first molecular sieve tower and a bottom exhaust pipeline 13 of the second molecular sieve tower through regenerated gas branch pipelines 15 respectively, a top air inlet pipeline 10 of the first molecular sieve tower and a top air inlet pipeline 11 of the second molecular sieve tower are also connected with the air cooler 6 and the separator 7 through regenerated gas exhaust pipelines 16 respectively in sequence, and a top discharge pipeline 17 of the separator 7 is connected with the gas inlet pipeline 9; a cold blowing bypass pipeline 18 is also connected between the outlet of the compressor 4 and the outlet of the explosion-proof electric heater 5; valves are arranged on the top air inlet pipeline, the bottom air outlet pipeline, the regenerated gas main pipeline 14, the regenerated gas branch pipeline 15 and the cold blowing bypass pipeline 18;
the explosion-proof electric heater 5 comprises a double-layer metal shell, wherein a spiral metal coil 5-3 and a plurality of longitudinally arranged electric heating pipes 5-4 are arranged in the double-layer metal shell, the inlet end of the metal coil 5-4 extends out of the double-layer metal shell and then is connected with the outlet of the compressor 4, and the outlet end of the metal coil 5-4 extends out of the double-layer metal shell and then is connected with a regeneration gas branch pipeline.
Specific:
as shown in fig. 1, in the above embodiment, it is preferable to further include a drain pipe 19; the drain outlet of the pre-filter 1, the drain outlet of the separator 7 and the drain outlet of the post-filter 3 are all connected with a drain pipe 19.
In the above embodiment, preferably, a first valve 8-1 is installed at one side of the inlet end of the pre-filter 1, a second valve 8-2 is installed on the top inlet pipe 10 of the first molecular sieve tower, and a third valve 8-3 is installed on the top inlet pipe 11 of the second molecular sieve tower; a fourth valve 8-4 is arranged on the bottom exhaust pipeline 13 of the first molecular sieve tower, a fifth valve 8-5 is arranged on the bottom exhaust pipeline 14 of the second molecular sieve tower, a sixth valve 8-6 is arranged at the inlet end of the compressor 4, a seventh valve 8-7 and an eighth valve 8-8 are respectively arranged at the inlet end and the outlet end of the explosion-proof electric heater 5, and a ninth valve 8-9 is arranged on the cold blowing bypass pipeline 18; a tenth valve 8-10 is arranged on a regenerated gas branch pipeline 15 connected with a bottom exhaust pipeline 12 of the first molecular sieve tower, and an eleventh valve 8-11 is arranged on the regenerated gas branch pipeline 15 connected with a bottom exhaust pipeline 13 of the second molecular sieve tower; a twelfth valve 8-12 is arranged on a regeneration exhaust pipeline 16 connected with the top air inlet pipeline 10 of the first molecular sieve tower, and a thirteenth valve 8-13 is arranged on the regeneration exhaust pipeline 16 connected with the top air inlet pipeline 11 of the second molecular sieve tower; the regeneration exhaust pipeline 16 corresponding to the inlet end and the outlet end of the air preheater 6 is also respectively connected with a fourteenth valve 8-14 and a fifteenth valve 8-15.
In the above embodiment, the sixteenth valve 8-16 is preferably mounted on the drain pipe 19 to which the drain of the pre-filter 1 is connected.
In the above embodiment, preferably, one end of the regenerated gas branch pipe 15 is connected to the outlet end of the explosion-proof electric heater 5, and the other end is connected in parallel with 2 branch pipes, one of which is connected to the bottom exhaust pipe 12 of the first molecular sieve tower, and the other of which is connected to the bottom exhaust pipe 13 of the second molecular sieve tower. The tenth valve 8-10 is installed on a branch pipe connected to the bottom exhaust pipe 12 of the first molecular sieve tower, and the eleventh valve 8-11 is installed on a branch pipe connected to the bottom exhaust pipe 13 of the second molecular sieve tower.
In the above embodiment, preferably, one end of the regeneration exhaust pipe 16 is connected to the inlet end of the air cooler 6, and the other end is connected in parallel with 2 branch pipes, wherein one branch pipe is connected to the top inlet pipe 10 of the first molecular sieve tower, and the connection point is located on the top inlet pipe 10 of the first molecular sieve tower between the second valve 8-2 and the first molecular sieve tower; the other branch pipeline is connected with the top air inlet pipeline 11 of the second molecular sieve tower, and the connecting point is positioned on the top air inlet pipeline 11 of the second molecular sieve tower between the third valve 8-3 and the second molecular sieve tower 2-2.
In the above embodiment, preferably, as shown in fig. 2, the double-layer metal casing of the explosion-proof electric heater 5 includes a first metal casing 5-1 and a second metal casing 5-2, the second metal casing 5-2 is sleeved outside the first metal casing 5-1, and an insulation layer 5-5 is filled between the first metal casing 5-1 and the second metal casing 5-2; the metal coil pipe 5-3 is arranged in the first metal shell, and the inlet end 5-31 and the outlet end of the metal coil pipe 5-3 extend out of the first metal shell 5-1 and the second metal shell 5-2; the electric heating pipes 5-4 are inserted into the middle inner cavity of the metal coil pipe 5-3 along the vertical direction.
In the above embodiment, preferably, the first metal housing 5-1 is a tubular metal cast body, the inside of which is filled with an insulating layer; the second metal shell 5-2 is completely sealed, and the second metal shell 5-2 is made of stainless steel. The wiring terminals of the plurality of electric heating pipes 5-4 are arranged in the junction box of the explosion-proof electric heater 5. The insulation 5-5 in this embodiment includes, but is not limited to, aluminum silicate fibers.
In the above embodiment, preferably, the separator is a vertical sedimentation separator, and a mist capturing screen is arranged in the vertical sedimentation separator; the mist-catching wire mesh can catch small droplets of more than 10 microns.
In the above embodiment, the air cooler 6 is preferably composed of a heat exchange tube, fins, a tube box, fan blades, and a motor. The fan blades are driven by the motor to rotate so as to push the air circulation rate on the surface of the heat exchange tube bundle, and the temperature of the cooled medium is reduced.
In the above embodiment, it is preferable that safety valves are installed on the gas supply pipeline 9, on the tube side pipelines of the first molecular sieve tower 2-1 and the second molecular sieve tower 2-2, and on the tube side pipeline of the explosion-proof electric heater 5, so as to ensure the safety of the system when the equipment and the pipeline are in overpressure.
In the above embodiment, it is preferable that the pre-filter 1, the first molecular sieve tower 2-1, the second molecular sieve tower 2-2, the post-filter 3, the compressor 4, the explosion-proof electric heater 5, the air cooler 6 and the separator 7 form a complete integrated skid-mounted device.
In the above embodiment, preferably, the treatment method of the skid-mounted scattered natural gas recovery treatment system includes an adsorption process, a heating regeneration process and a cold blowing process, wherein the adsorption and regeneration of the first molecular sieve tower 2-1 and the second molecular sieve tower 2-2 are switched for use, that is, one molecular sieve tower is adsorbed while the other molecular sieve tower is regenerated, and the first molecular sieve tower 2-1 and the second molecular sieve tower 2-2 cannot be simultaneously adsorbed or regenerated, so as to realize continuous production without interruption and improve the production efficiency;
wherein, the adsorption process specifically comprises:
1) The raw material gas enters a pre-filter 1 through an inlet gas pipeline 9 to be filtered and coalesced, the filtered and coalesced raw material gas enters a first molecular sieve tower 2-1 or a second molecular sieve tower 2-2 to be dehydrated, and the dew point of the raw material gas dehydrated by the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2 is less than or equal to 60 ℃;
2) The dehydrated raw gas enters a post filter 3 for filtering to remove impurities and dust carried in the natural gas, and the raw gas with the impurities and dust removed is discharged through a dry gas output pipeline 20.
The heating regeneration process specifically comprises the following steps:
1) Leading out a strand of regenerated gas from the dry gas output pipeline by the raw gas filtered by the post filter 3, compressing the regenerated gas by the compressor 4, and conveying the compressed gas to the explosion-proof electric heater 5 for heating, so that the temperature of the regenerated gas is increased to 200-260 ℃;
2) The heated regenerated gas enters the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2 through a regenerated gas branch pipeline respectively, and the saturated molecular sieve in the bed layer in the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2 is heated and regenerated to 200-230 ℃;
3) The regenerated moisture after regeneration is discharged to the air cooler 6 from the top of the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2 through the regenerated exhaust pipeline 16, and is conveyed into the separator 7 after being cooled to 45 ℃ by the air cooler 6; 4. the gas separated by the separator 7 is returned to the gas supply line 9 via the top discharge line 17.
The cold blowing process specifically comprises the following steps of;
1) After the regeneration, the water adsorption capacity is reduced due to the higher temperature of the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2, so that the bed layer of the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2 needs to be cooled by cold blowing. The cold blowing gas adopts dehydrated regenerated gas, and the regenerated gas compressed by a compressor is conveyed into the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2 through a cold blowing bypass pipeline 18 and a regenerated gas branch pipeline 15 so as to cool the bed layer in the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2;
2. the cold blowing gas discharged from the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2 is conveyed to an air cooler 6 for cooling through a regeneration exhaust pipeline 16, and the cold blowing gas is cooled to 45 ℃ by the air cooler 6 and then conveyed into a separator 7;
3. the gas separated by the separator 7 is returned to the gas supply line 9 via the top discharge line 17.
The operation method of the embodiment comprises the following steps:
because the molecular sieve has adsorbed water in the air when first put into production, therefore, when first put into production, one molecular sieve tower adsorbs, and another molecular sieve tower regenerates. In this embodiment, when the system is started, the second molecular sieve tower 2-2 is selected to perform adsorption operation, and the first molecular sieve tower 2-1 is regenerated, which specifically comprises the following operations:
1) Confirming that all valves are in a closed state, opening a first valve 8-1 at the inlet end of the pre-filter 1, simultaneously opening a second valve 8-2 and a third valve 8-3, introducing raw material gas into the first molecular sieve tower 2-1 and the second molecular sieve tower 2-2, opening a fourth valve 8-4 and a fifth valve 8-5, filtering the dehydrated raw material gas by a post-filter 3, and then conveying the filtered raw material gas to a dry gas external conveying pipeline 20;
2) Opening a sixth valve 8-6, a seventh valve 8-7, an eighth valve 8-8, a tenth valve 8-10, a twelfth valve 8-12, a fourteenth valve 8-14 and a fifteenth valve 8-15, simultaneously starting a compressor 4 to circulate regeneration gas, starting an explosion-proof electric heater 5 to heat the regeneration gas, enabling the first molecular sieve tower 2-1 to be in a regeneration process, and opening and closing the air cooler 6 can be performed according to the regeneration exhaust temperature;
3) Starting cold blowing, closing a seventh valve 8-7 and an eighth valve 8-8, opening a ninth valve 8-9, enabling regeneration gas to directly jump over the explosion-proof electric heater 5, directly enter the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2, cooling the bed temperature in the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2, closing the compressor 4 when the regeneration cold gas exhaust temperature in a regeneration exhaust pipeline of the first molecular sieve tower 2-1 or the second molecular sieve tower 2-2 meets the process requirement, closing the ninth valve 8-9, and ending regeneration cooling.
4) And after the regeneration of the first molecular sieve tower 2-1 is finished, closing the third valve, the fifth valve, the tenth valve and the twelfth valve, and opening the second valve, the fourth valve, the eleventh valve and the thirteenth valve to switch the system to the second molecular sieve tower 2-2 for regeneration, wherein the first molecular sieve tower 2-1 is used for adsorption.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (5)
1. The skid-mounted scattered natural gas recovery processing system is characterized by comprising a pre-filter, a first molecular sieve tower, a second molecular sieve tower, a post-filter, a compressor, an explosion-proof electric heater, an air cooler and a separator;
the inlet of the pre-filter is connected with an air inlet pipeline, the outlet of the pre-filter is respectively connected with the top air inlet pipeline of the first molecular sieve tower and the top air inlet pipeline of the second molecular sieve tower, the bottom air outlet pipeline of the first molecular sieve tower and the bottom air outlet pipeline of the second molecular sieve tower are respectively connected with the inlet of the post-filter, and the outlet of the post-filter is connected with a dry gas output pipeline;
the outlet of the rear filter is further connected with the compressor and the anti-explosion electric heater in sequence through a regenerated gas main pipeline, the outlet of the anti-explosion electric heater is connected with the bottom exhaust pipeline of the first molecular sieve tower and the bottom exhaust pipeline of the second molecular sieve tower through regenerated gas branch pipelines respectively, the top air inlet pipeline of the first molecular sieve tower and the top air inlet pipeline of the second molecular sieve tower are also connected with the air cooler and the separator through regenerated exhaust pipelines respectively in sequence, and the top discharge pipeline of the separator is connected with the air inlet pipeline; a cold blowing bypass pipeline is also connected between the outlet of the compressor and the outlet of the explosion-proof electric heater; valves are arranged on the top air inlet pipeline, the bottom air outlet pipeline, the regenerated gas main pipeline, the regenerated gas branch pipeline and the cold blowing bypass pipeline;
the anti-explosion electric heater comprises a double-layer metal shell, a spiral metal coil and a plurality of longitudinally arranged electric heating pipes are arranged in the double-layer metal shell, the inlet end of the metal coil stretches out of the double-layer metal shell and then is connected with the outlet of the compressor, and the outlet end of the metal coil stretches out of the double-layer metal shell and then is connected with the regenerated gas branch pipeline.
2. The intrinsically-safe skid-mounted scattered natural gas recovery processing system of claim 1, further comprising a blow down conduit;
the drain outlet of the front filter, the drain outlet of the separator and the drain outlet of the rear filter are all connected with the drain pipeline.
3. The intrinsically-safe skid-mounted scattered natural gas recovery processing system of claim 1, wherein a first valve is arranged on one side of the inlet end of the pre-filter, a second valve is arranged on the top inlet pipeline of the first molecular sieve tower, and a third valve is arranged on the top inlet pipeline of the second molecular sieve tower;
a fourth valve is arranged on the bottom exhaust pipeline of the first molecular sieve tower, a fifth valve is arranged on the bottom exhaust pipeline of the second molecular sieve tower, a sixth valve is arranged at the inlet end of the compressor, a seventh valve and an eighth valve are respectively arranged at the inlet end and the outlet end of the explosion-proof electric heater, and a ninth valve is arranged on the cold blowing bypass pipeline;
a tenth valve is arranged on the regenerated gas branch pipeline connected with the bottom exhaust pipeline of the first molecular sieve tower, and an eleventh valve is arranged on the regenerated gas branch pipeline connected with the bottom exhaust pipeline of the second molecular sieve tower;
a twelfth valve is arranged on the regenerated exhaust pipeline connected with the top air inlet pipeline of the first molecular sieve tower, and a thirteenth valve is arranged on the regenerated exhaust pipeline connected with the top air inlet pipeline of the second molecular sieve tower;
the fourteenth valve and the fifteenth valve are respectively connected to the regeneration exhaust pipeline corresponding to the inlet end and the outlet end of the air preheater.
4. The intrinsically-safe skid-mounted scattered natural gas recovery processing system of claim 1, wherein the double-layer metal shell comprises a first metal shell and a second metal shell, the second metal shell is sleeved outside the first metal shell, and an insulating layer is filled between the first metal shell and the second metal shell;
the metal coil is arranged in the first metal shell, and the inlet end and the outlet end of the metal coil extend out of the first metal shell and the second metal shell;
the electric heating pipes are inserted into the inner cavity of the middle part of the metal coil pipe along the vertical direction.
5. The intrinsically safe skid-mounted scattered natural gas recovery processing system of claim 1, wherein the separator is a vertical sedimentation separator, and a mist capturing silk screen is arranged in the vertical sedimentation separator;
the mist-catching wire mesh can catch liquid drops with the diameter of more than 10 micrometers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321903217.4U CN220432736U (en) | 2023-07-19 | 2023-07-19 | Intrinsic safety skid-mounted scattered natural gas recycling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321903217.4U CN220432736U (en) | 2023-07-19 | 2023-07-19 | Intrinsic safety skid-mounted scattered natural gas recycling system |
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| CN202321903217.4U Active CN220432736U (en) | 2023-07-19 | 2023-07-19 | Intrinsic safety skid-mounted scattered natural gas recycling system |
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