CN215975692U - High-energy skid-mounted molecular sieve dehydration device - Google Patents
High-energy skid-mounted molecular sieve dehydration device Download PDFInfo
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Abstract
The utility model relates to the technical field of molecular sieve dehydration, in particular to a high-energy skid-mounted molecular sieve dehydration device which comprises a water-cooling heat exchanger, a pre-separator, a demercuration tower, an air cooler, a first dehydration tower, a second dehydration tower, a circulating compressor and a heat-conducting oil heat exchanger, wherein the water-cooling heat exchanger is communicated with a raw material gas inlet pipeline, a first liquid pipeline is communicated between the water-cooling heat exchanger and the pre-separator, a second liquid pipeline is communicated between the pre-separator and the demercuration tower, a third liquid pipeline is communicated between the demercuration tower and the first dehydration tower, and a fourth liquid pipeline is communicated between the third liquid pipeline and the second dehydration tower. The utility model has reasonable and compact structure and convenient use, adopts closed circulation isobaric regeneration, combines the separator and the regeneration separator, utilizes the water-cooling heat exchanger to cool the regenerated gas, is skid-mounted, is convenient for piping and can realize quick moving and mounting, saves energy consumption, does not cause resource waste, and has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.
Description
Technical Field
The utility model relates to the technical field of molecular sieve dehydration, in particular to a high-energy skid-mounted molecular sieve dehydration device.
Background
At present, the side-far wells, scattered wells, trial production wells and oil transfer stations containing associated gas in domestic oil fields are scattered due to extremely small distribution and unstable yield, and the construction of oil field pipe networks is not economical and can only be emptied and combusted in situ, thereby wasting a large amount of resources and causing serious environmental pollution.
China has long conceived the concept of eliminating oil field torches. For many years, China has been studying the recovery device and process of associated gas. However, due to the difference of the geographical positions of the oil fields, the conditions of the associated gas of the oil and gas fields are different, and the method is specifically divided into two types, namely the associated gas which has a large yield and is distributed more intensively and can directly enter a pipe network, and the associated gas which is distributed more scattered and remote well zones is distributed more dispersedly and has a small amount, is far away from a natural gas pipe network and is not suitable for laying a pipeline due to economic benefit. Therefore, the recycling manner adopted for associated gas from different sources is different.
Daqing oil field makes great progress in associated gas purifying treatment method. The process comprises the steps of firstly carrying out gravity settling pretreatment on the associated gas, separating out dirty oil, free water and sand with large particle size, then separating out dust and liquid drops with the particle size of more than 20 microns in the gas through a cyclone separator, finally carrying out precise filtration on hollow fibers, and filtering impurities with the particle size of more than 5 microns in the gas to obtain the associated gas with high purity. At present, 1 set of relatively perfect oil-gas field associated gas collection, processing, storage and conveying system is available in Daqing oil fields. Meanwhile, 14 sets of oil-gas field associated gas primary processing devices and matched natural gas and light hydrocarbon sales pipe networks are built in Daqing oil fields, so that associated gas becomes a part of dry natural gas and can be used for self consumption of oil field gathering and transportation systems and gas processing devices, and the rest can be sold as commodity gas.
Changqing oil field division has conducted intensive research on the recycling of Jingan oil gas field associated gas. This oil field adopts oil gas multiphase pump and natural gas compressor to dissolve gas from connecing the airtight transport of transfer station to the joint station in with the station, deviates from the associated gas with oil gas water through three-phase separation or settling cask at the joint station, and the associated gas that will deviate from again passes through light hydrocarbon factory feed gas compressor unit and bleeds, enters into light hydrocarbon recovery system further processing at last, forms products such as qualified light oil, liquefied gas. The project realizes the closed gathering and transportation from an upstream gas source to a downstream light hydrocarbon recovery process, reduces the concentration of oil gas at each station, optimizes the mixing transportation pump and the variable-frequency speed regulation device and realizes the continuous and stable recovery of associated gas. The method is a mature process technology, provides experience for similar oil fields, and has a good development prospect.
And recovering the associated gas by adopting a shallow cold separation process in the North China oil field. Firstly, crude oil enters a pre-degassing chamber at a high speed through a three-phase separator (an oil-gas-water mixture enters the pre-degassing chamber, a large amount of crude oil associated gas is removed under the action of cyclone separation and gravity), low-pressure associated gas is separated, condensate oil is recovered through compression and freezing (ammonia is used as a refrigerant), and then the condensate oil is dried to obtain a product. The recovered gas is used for power generation or combustion in a heating furnace. Associated gas generated by some remote scattered wells is used as fuel of an aboveground gas engine to provide power for a pumping unit because the gas is difficult to enter a large gas transmission system. The associated gas of the North China oil and gas field is completely recycled.
According to the components and characteristics of a gas source of associated gas of an oil-gas field, two processes of liquefaction of a mixed refrigerant without precooling and nitrogen expansion liquefaction are designed for an offshore oil field in the south China sea. The mixed refrigerant liquefaction process firstly expands high-pressure associated gas to lower pressure by an expander, then is cooled by a heat exchanger, and finally is throttled and cooled to storage pressure by a throttle valve, and the obtained liquid associated gas is conveyed to a corresponding storage container for storage. The nitrogen expansion liquefaction process takes nitrogen of single gas as a refrigerant, and the refrigerant is kept in a gas phase all the time in the liquefaction process.
After years of efforts, the recovery and utilization of associated gas are realized in most of large oil fields in China, but a great development space still exists. In addition, due to geographical location and economic benefits, associated gas cannot be completely recycled for scattered and remote well zones. Therefore, research and development of an associated gas recovery device and a process technology which are convenient to move, small in size and power and suitable for recovering scattered and remote well zones become a research hotspot in the future.
Disclosure of Invention
The utility model provides a high-energy skid-mounted molecular sieve dehydration device, overcomes the defects of the prior art, and can effectively solve the problem that the processing capacity of the existing molecular sieve dehydration device is limited by the transportation size and the water content in regenerated gas exceeds the standard under the working condition in summer.
The technical scheme of the utility model is realized by the following measures: a high-energy skid-mounted molecular sieve dehydration device comprises a water-cooling heat exchanger, a preseparator, a demercuration tower, an air cooler, a first dehydration tower, a second dehydration tower, a circulating compressor and a heat-conducting oil heat exchanger, wherein a water-cooling unit water inlet pipeline is fixedly communicated with a water-cooling heat exchanger tube pass inlet, a water-cooling unit water outlet pipeline is fixedly communicated with a water-cooling heat exchanger tube pass outlet, a raw material gas inlet pipeline is fixedly communicated with a water-cooling heat exchanger shell pass inlet, a first liquid pipeline is fixedly communicated between the water-cooling heat exchanger shell pass outlet and the preseparator top inlet, a second liquid pipeline is fixedly communicated between the preseparator top outlet and the demercuration tower top inlet, a blowdown pipeline is fixedly communicated with a preseparator bottom outlet, a third liquid pipeline is fixedly communicated between the demercuration tower bottom outlet and the first dehydration tower top inlet, a fourth liquid pipeline is fixedly communicated between the third liquid pipeline and the second dehydration tower top inlet, a first cooling pipeline is fixedly communicated between a third liquid pipeline between the first dehydrating tower and the fourth liquid pipeline and an inlet of the air cooler, a second cooling pipeline is fixedly communicated between an outlet of the air cooler and a raw material gas incoming pipeline, a third cooling pipeline is communicated between the first cooling pipeline and the fourth liquid pipeline, a first downstream pipeline is fixedly communicated with an outlet at the bottom of the first dehydrating tower, a second downstream pipeline is communicated between an outlet at the bottom of the second dehydrating tower and the first downstream pipeline, a first temperature-raising regenerated gas pipeline is fixedly communicated between the first downstream pipeline between the first dehydrating tower and the second downstream pipeline and an outlet at the top shell pass of the heat-conducting oil heat exchanger, a second temperature-raising regenerated gas pipeline is communicated between the first temperature-raising regenerated gas pipeline and the second downstream pipeline, a regenerated gas pressure-increasing pipeline is fixedly communicated between the first downstream pipeline between the outlet of the second downstream pipeline and the first downstream pipeline and an inlet at the bottom shell pass of the heat exchanger, the regeneration gas booster pipeline is fixedly provided with a circulating compressor, a heat conduction oil incoming pipeline is fixedly communicated with an inlet of a tube pass of the heat conduction oil heat exchanger, a heat conduction oil outgoing pipeline is fixedly communicated with an outlet of the tube pass of the heat conduction oil heat exchanger, and the water cooling heat exchanger, the preseparator, the demercuration tower, the air cooler, the first dehydration tower, the second dehydration tower, the circulating compressor and the heat conduction oil heat exchanger are all fixedly arranged on the prying seat.
The following are further optimization or/and improvement of the technical scheme of the utility model:
the pre-separator is provided with a liquid level meter.
An interlock is arranged between the liquid level meter and the automatic regulating valve.
And a front-mounted filtering separator is fixedly arranged on the third liquid pipeline between the demercuration tower and the fourth liquid pipeline.
And a post-filter separator is fixedly arranged on the first downstream removal pipeline between the second downstream removal pipeline and the regeneration gas pressurization pipeline.
And valves are connected in series on the third liquid pipeline, the fourth liquid pipeline, the first cooling pipeline between the third liquid pipeline and the second cooling pipeline, the first downstream pipeline between the first dehydrating tower and the second downstream pipeline, the first warming regeneration gas pipeline between the first downstream pipeline and the second warming regeneration gas pipeline, and the second warming regeneration gas pipeline.
The utility model has reasonable and compact structure and convenient use, adopts closed circulation isobaric regeneration, combines the separator and the regeneration separator, utilizes the water-cooling heat exchanger to cool the regenerated gas, is skid-mounted, is convenient for piping and can realize quick moving and mounting, saves energy consumption, does not cause resource waste, and has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
The codes in the figures are respectively: 1 is a water-cooled heat exchanger, 2 is a preseparator, 3 is a demercuration tower, 4 is an air cooler, 5 is a first dehydration tower, 6 is a second dehydration tower, 7 is a circulating compressor, 8 is a heat transfer oil heat exchanger, 9 is a level gauge, 10 is an automatic regulating valve, 11 is a pre-filter separator, 12 is a water cooling unit incoming water pipeline, 13 is a water cooling unit incoming water pipeline, 14 is a raw material gas incoming gas pipeline, 15 is a first liquid pipeline, 16 is a second liquid pipeline, 17 is a sewage discharge pipeline, 18 is a third liquid pipeline, 19 is a fourth liquid pipeline, 20 is a first cooling pipeline, 21 is a second cooling pipeline, 22 is a third cooling pipeline, 23 is a first downstream pipeline, 24 is a second downstream pipeline, 25 is a first temperature-raising regeneration gas pipeline, 26 is a second temperature-raising regeneration gas pipeline, 27 is a regeneration gas pressurization pipeline, 28 is an oil incoming pipeline, 29 is a heat transfer oil outlet pipeline, and 30 is a post-filtration separator.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
The utility model is further described with reference to the following examples and figures:
as shown in attached figure 1, the high-energy skid-mounted molecular sieve dehydration device comprises a water-cooling heat exchanger 1, a pre-separator 2, a demercuration tower 3, an air cooler 4, a first dehydration tower 5, a second dehydration tower 6, a circulating compressor 7 and a heat transfer oil heat exchanger 8, wherein a water-cooling unit incoming water pipeline 12 is fixedly communicated with a tube pass inlet of the water-cooling heat exchanger 1, a water-cooling unit outgoing water pipeline 13 is fixedly communicated with a tube pass outlet of the water-cooling heat exchanger 1, a raw material incoming gas pipeline 14 is fixedly communicated with a shell pass inlet of the water-cooling heat exchanger 1, a first liquid pipeline 15 is fixedly communicated between the shell pass outlet of the water-cooling heat exchanger 1 and a top inlet of the pre-separator 2, a second liquid pipeline 16 is fixedly communicated between the top outlet of the pre-separator 2 and a top inlet of the demercuration tower 3, a blow-off pipeline 17 is fixedly communicated with a bottom outlet of the pre-separator 2, a third liquid pipeline 18 is fixedly communicated between the bottom outlet of the demercuration tower 3 and a top inlet of the first dehydration tower 5, a fourth liquid pipeline 19 is fixedly communicated between the third liquid pipeline 18 and the top inlet of the second dehydration tower 6, a first cooling pipeline 20 is fixedly communicated between the third liquid pipeline 18 between the first dehydration tower 5 and the fourth liquid pipeline 19 and the inlet of the air cooler 4, a second cooling pipeline 21 is fixedly communicated between the outlet of the air cooler 4 and the raw material gas incoming pipeline 14, a third cooling pipeline 22 is communicated between the first cooling pipeline 20 and the fourth liquid pipeline 19, a first downstream pipeline 23 is fixedly communicated with the bottom outlet of the first dehydration tower 5, a second downstream pipeline 24 is communicated between the bottom outlet of the second dehydration tower 6 and the first downstream pipeline 23, a first temperature-raising regeneration gas pipeline 25 is fixedly communicated between the first downstream pipeline 23 between the first dehydration tower 5 and the second downstream pipeline 24 and the top shell pass outlet of the heat-conducting oil heat exchanger 8, and a second regeneration temperature-raising gas pipeline 26 is communicated between the first temperature-raising regeneration gas pipeline 25 and the second downstream pipeline 24, a regeneration gas pressurizing pipeline 27 is fixedly communicated between the first downstream-removing pipeline 23 between the second downstream-removing pipeline 24 and the outlet of the first downstream-removing pipeline 23 and a shell pass inlet at the bottom of the heat-conducting oil heat exchanger 8, a circulating compressor 7 is fixedly installed on the regeneration gas pressurizing pipeline 27, a heat-conducting oil incoming pipeline 28 is fixedly communicated with the tube pass inlet of the heat-conducting oil heat exchanger 8, a heat-conducting oil outgoing pipeline 29 is fixedly communicated with the tube pass outlet of the heat-conducting oil heat exchanger 8, and the water-cooling heat exchanger 1, the pre-separator 2, the demercuration tower 3, the air cooler 4, the first dehydration tower 5, the second dehydration tower 6, the circulating compressor 7 and the heat-conducting oil heat exchanger 8 are all fixedly installed on the pry seat.
The utility model adopts closed circulation isobaric regeneration, and the regenerated gas returns to the system completely, thereby avoiding resource waste; meanwhile, the precooling technology cools the natural gas to be 5 ℃ above the hydrate formation temperature for predehydration, the preseparator 2 is combined with the original regeneration separator, the pipe is more convenient to assemble, the cost is saved, and the natural gas treatment capacity of the skid-mounted molecular sieve dehydration device can reach 15 multiplied by 10 under the working pressure of 2.0MPa at present4Nm3D; and utilize water-cooling heat exchanger 1 to cool off the regeneration gas, when ambient temperature is higher, air cooler 4 high rotational speed operation, and when ambient temperature is lower, air cooler 4 can low rotational speed operation, the energy saving consumption.
The skid-mounted installation of the utility model can realize rapid relocation and installation. Quick connectors of pipelines and cables are used for quick installation, and meanwhile, the cable is laid on the wiring duct board ground, so that the workload is greatly reduced, and the moving cost is saved.
The process flow of the utility model is as follows: the raw gas enters a water-cooling heat exchanger 1 for precooling, then part of liquid is separated, then the liquid enters a preseparator 2 for dehydration, the dehydrated gas enters a demercuration tower 3 for demercuration, the demercurated gas enters a preposed filtering separator 11 for filtering, then enters a dehydration tower for dehydration through a molecular sieve, the dehydrated natural gas can obtain natural gas with the water dew point less than or equal to minus 60 ℃, the gas discharged from the dehydration tower enters a postpositional filtering separator 30, and the natural gas after impurities and dust are removed through the filtering separator enters a downstream system.
The heating regeneration (the regeneration of the molecular sieve is a dry gas regeneration process) process comprises the following steps: the regenerated dry gas is led out from the outlet of the post-filter separator 30, after being pressurized by the circulating compressor 7, the regenerated gas is heated by the heat-conducting oil heater, the temperature is raised to the regeneration temperature (230 ℃) of the molecular sieve, the regenerated gas enters from the bottom of the dehydration tower, the saturated molecular sieve in the bed layer of the dehydration tower is heated and regenerated, the regenerated gas enters the air cooler 4 for preliminary cooling and then enters the pre-separator 2 for gas-liquid separation, and the separated gas returns to the inlet of the pre-filter separator 11.
The cold blowing process comprises the following steps: after regeneration is finished, the molecular sieve has high temperature, so that the adsorption capacity to water is reduced, and the bed layer of the dehydration tower needs to be cooled by cold blowing. The cold blowing gas is still led out from the outlet of the post-filter separator 30, and directly passes through the heat conduction oil heat exchanger 8 after being pressurized by the circulating compressor 7, at the moment, the heat conduction oil is circulated outside and does not enter the heat exchanger, the dehydrated feed gas enters the molecular sieve dehydration tower to cool and cold blow the medium-high temperature molecular sieve in the bed layer until the molecular sieve in the bed layer of the dehydration tower reaches the normal working temperature, the cold blowing gas discharged from the dehydration tower is cooled to the temperature of the incoming air by the air cooler 4 and then enters the pre-separator 2 to carry out gas-liquid separation, and the separated gas returns to the inlet of the pre-filter separator 11.
The high-energy skid-mounted molecular sieve dehydration device can be further optimized or/and improved according to actual needs:
as shown in fig. 1, a liquid level gauge 9 is provided on the preseparator 2.
As shown in fig. 1, an automatic regulating valve 10 is fixedly mounted on the sewage discharge line 17.
As shown in fig. 1, an interlock is provided between the level gauge 9 and the self-regulating valve 10.
The liquid level meter 9 and the automatic regulating valve 10 are interlocked, so that timely automatic pollution discharge in the preseparator 2 is ensured.
As shown in fig. 1, a pre-filter separator 11 is fixedly installed on a third liquid line 18 between the demercuration tower 3 and a fourth liquid line 19.
As shown in fig. 1, a post-filter separator 30 is fixedly installed on the first downstream line 23 between the second downstream line 24 and the regeneration gas pressurizing line 27.
The pre-filter separator 11 and the post-filter separator 30 may be known and used as common pipeline filters, so as to remove impurities and dust carried in the natural gas in time and facilitate disassembly and assembly.
As shown in fig. 1, the third liquid line 18 between the first dehydrating tower 5 and the fourth liquid line 19, the first cooling line 20 between the third liquid line 18 and the second cooling line 21, the first downstream line 23 between the first dehydrating tower 5 and the second downstream line 24, the first warming regeneration gas line 25 between the first downstream line 23 and the second warming regeneration gas line 26, and the second warming regeneration gas line 26 are connected in series and with valves.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (10)
1. A high-energy skid-mounted molecular sieve dehydration device is characterized by comprising a water-cooling heat exchanger, a preseparator, a demercuration tower, an air cooler, a first dehydration tower, a second dehydration tower, a circulating compressor and a heat transfer oil heat exchanger, wherein a water-cooling unit water inlet pipeline is fixedly communicated with a water-cooling heat exchanger tube pass inlet, a water-cooling unit water outlet pipeline is fixedly communicated with a water-cooling heat exchanger tube pass outlet, a raw material gas inlet pipeline is fixedly communicated with a water-cooling heat exchanger shell pass inlet, a first liquid pipeline is fixedly communicated between the water-cooling heat exchanger shell pass outlet and the preseparator top inlet, a second liquid pipeline is fixedly communicated between the preseparator top outlet and the demercuration tower top inlet, a blowdown pipeline is fixedly communicated with a preseparator bottom outlet, a third liquid pipeline is fixedly communicated between the demercuration tower bottom outlet and the first dehydration tower top inlet, a fourth liquid pipeline is fixedly communicated between the third liquid pipeline and the second dehydration tower top inlet, a first cooling pipeline is fixedly communicated between a third liquid pipeline between the first dehydrating tower and the fourth liquid pipeline and an inlet of the air cooler, a second cooling pipeline is fixedly communicated between an outlet of the air cooler and a raw material gas incoming pipeline, a third cooling pipeline is communicated between the first cooling pipeline and the fourth liquid pipeline, a first downstream pipeline is fixedly communicated with an outlet at the bottom of the first dehydrating tower, a second downstream pipeline is communicated between an outlet at the bottom of the second dehydrating tower and the first downstream pipeline, a first temperature-raising regenerated gas pipeline is fixedly communicated between the first downstream pipeline between the first dehydrating tower and the second downstream pipeline and an outlet at the top shell pass of the heat-conducting oil heat exchanger, a second temperature-raising regenerated gas pipeline is communicated between the first temperature-raising regenerated gas pipeline and the second downstream pipeline, a regenerated gas pressure-increasing pipeline is fixedly communicated between the first downstream pipeline between the outlet of the second downstream pipeline and the first downstream pipeline and an inlet at the bottom shell pass of the heat exchanger, the regeneration gas booster pipeline is fixedly provided with a circulating compressor, a heat conduction oil incoming pipeline is fixedly communicated with an inlet of a tube pass of the heat conduction oil heat exchanger, a heat conduction oil outgoing pipeline is fixedly communicated with an outlet of the tube pass of the heat conduction oil heat exchanger, and the water cooling heat exchanger, the preseparator, the demercuration tower, the air cooler, the first dehydration tower, the second dehydration tower, the circulating compressor and the heat conduction oil heat exchanger are all fixedly arranged on the prying seat.
2. The high energy skid-mounted molecular sieve dehydration plant of claim 1 characterized in that a liquid level meter is provided on the preseparator.
3. The high-energy skid-mounted molecular sieve dehydration device of claim 1 or 2 characterized in that an automatic regulating valve is fixedly installed on a sewage discharge pipeline.
4. The high energy skid-mounted molecular sieve dehydration plant of claim 3 characterized in that an interlock is provided between the level gauge and the self-regulating valve.
5. The high energy skid-mounted molecular sieve dehydration plant of claim 1 or 2 or 4 characterized in that a pre-filtration separator is fixedly installed on the third liquid line between the demercuration tower and the fourth liquid line.
6. The high energy skid-mounted molecular sieve dehydration plant of claim 3 characterized in that a pre-filter separator is fixedly installed on the third liquid line between the demercuration tower and the fourth liquid line.
7. The high energy skid-mounted molecular sieve dehydration plant of claim 1 or 2 or 4 or 6 characterized in that a post-filtration separator is fixedly installed on the first downstream line between the second downstream line and the regeneration gas pressurization line.
8. The high energy skid-mounted molecular sieve dehydration plant of claim 3 characterized in that a post-filtration separator is fixedly installed on the first downstream line between the second downstream line and the regeneration gas pressurization line.
9. The high energy skid-mounted molecular sieve dehydration plant of claim 5 characterized in that a post-filtration separator is fixedly installed on the first downstream line between the second downstream line and the regeneration gas pressurization line.
10. The high energy skid-mounted molecular sieve dehydration device of claim 1 or 2 or 4 or 6 or 8 or 9 characterized in that the third liquid line between the first dehydration tower and the fourth liquid line, the first cooling line between the third liquid line and the second cooling line, the first downstream line between the first dehydration tower and the second downstream line, the first temperature-rising regeneration gas line between the first downstream line and the second temperature-rising regeneration gas line, and the second temperature-rising regeneration gas line are connected in series and valves.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122065361.2U CN215975692U (en) | 2021-08-30 | 2021-08-30 | High-energy skid-mounted molecular sieve dehydration device |
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| CN202122065361.2U CN215975692U (en) | 2021-08-30 | 2021-08-30 | High-energy skid-mounted molecular sieve dehydration device |
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