Skid-mounted gas separation membrane device and use method thereof

Abstract

The invention relates to the technical field of gas separation, and discloses a skid-mounted gas separation membrane device and a use method thereof.The device comprises a skid body, and a filtering and drying system, a secondary cooling system, a suspension separator, a compression system, a gas storage tank and a membrane assembly are detachably connected to the skid body; the filtering and drying system is used for filtering solid particles and moisture in raw material gas, the secondary cooling system is used for cooling the raw material gas, the suspension separator is used for removing liquefied components in the raw material gas, and the compression system is used for compressing the raw material gas into high-pressure gas; the membrane assembly comprises a main pipeline and two membrane devices, the main pipeline is connected with a first branch pipe and a second branch pipe through a first hand-operated direction valve, the two membrane devices are arranged on the first branch pipe in a spaced mode, one end of the second branch pipe is communicated with the portion, between the two membrane devices, of the first branch pipe, and the main pipeline is communicated with the gas storage tank. The device can be used for evaluating the performance of the gas separation membrane component, is compact and portable, remarkably reduces the occupied area and the transportation cost, and is suitable for small oil and gas fields and complex terrains.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas separation, in particular to a skid-mounted gas separation membrane device and a use method thereof. BACKGROUND

[0002] The gas separation membrane device generally comprises a membrane assembly, a compressor, a buffer separation tank, a to-be-separated gas cooler, a gas heat exchanger, a gas-liquid separator, a filter and the like, and the whole system design is relatively complicated. Various thermodynamic problems that need to be considered in the design may cause insufficient chemical and thermal stability. During the operation of the large equipment, particulate matters, water vapor and the like in the to-be-separated gas may cause membrane hole blockage when condensed, resulting in membrane pollution and aging, and the membrane assembly needs to be frequently replaced. Due to the high maintenance cost of the large equipment, the cost recovery period of the membrane equipment is long. It is necessary to have a clear understanding of the use performance of the membrane assembly under actual working conditions, so as to reasonably design and build the gas separation membrane industrial device.

[0003] Therefore, a skid-mounted gas separation membrane device and a use method thereof are provided. SUMMARY

[0004] The present application aims to provide a skid-mounted gas separation membrane device and a use method thereof, and at least one of the above technical problems is solved or improved.

[0005] To achieve the above-mentioned purpose, the present application provides the following scheme: the present application provides a skid-mounted gas separation membrane device, comprising a pry body, a filter drying system, a secondary cooling system, a suspension separator, a compression system, a gas storage tank and a membrane assembly are detachably connected to the pry body; the filter drying system, the secondary cooling system, the suspension separator, the compression system, the gas storage tank and the membrane assembly are sequentially communicated through pipelines; The filter drying system is used for filtering solid particles and moisture in raw gas, the secondary cooling system is used for cooling the raw gas, the suspension separator is used for removing liquefied components in the raw gas, and the compression system is used for compressing the raw gas into high-pressure gas; The membrane assembly comprises a main pipeline and two membrane devices, the main pipeline is connected with a first branch pipe and a second branch pipe through a first manual reversing valve, the two membrane devices are spaced apart on the first branch pipe, one end of the second branch pipe is communicated with the first branch pipe between the two membrane devices, and the main pipeline is communicated with the gas storage tank; Among them, the monitoring system is installed on the pipeline, the main pipeline, the first branch pipe and the second branch pipe, and the monitoring system is used for monitoring the gas composition, temperature, pressure and flow.

[0006] The pry-mounted gas separation membrane device provided by the present application, the filter drying system comprises a pre-filter and a dryer group, one end of the pre-filter is communicated with a gas collecting station through a feed pipe, the other end is communicated with the dryer group, the dryer group is communicated with the secondary cooling system through the pipeline, and an air inlet valve is installed on the feed pipe.

[0007] The pry-mounted gas separation membrane device provided by the present application, the dryer group comprises two drying branches, the two drying branches are communicated with the discharge end of the pre-filter through a second manual reversing valve, a first dryer is installed on each of the two drying branches, and the two drying branches are communicated with the pipeline.

[0008] The pry-mounted gas separation membrane device provided by the present application, the secondary cooling system comprises a first heat exchanger, a second heat exchanger and a refrigerating machine; the first heat exchanger and the second heat exchanger are connected with the refrigerating machine through a refrigerating pipeline; the first heat exchanger and the second heat exchanger are installed on the pipeline at intervals, and a second dryer is installed between the second heat exchanger and the suspension separator.

[0009] The pry-mounted gas separation membrane device provided by the present application, the monitoring system comprises a plurality of pressure gauges, a plurality of temperature transmitters, a plurality of gas component sensors and a plurality of flow sensors. The total pipeline is provided with pressure gauges, temperature transmitters and gas component sensors, the first branch pipe and the second branch pipe are provided with gas component sensors and flow sensors, and the pipeline between the drying branch and the first heat exchanger is provided with pressure gauges, temperature transmitters and gas component sensors.

[0010] The pry-mounted gas separation membrane device provided by the present application, the compression system adopts a double-stroke natural gas compressor.

[0011] The pry-mounted gas separation membrane device provided by the present application, the pre-filter adopts a straight-through blue filter, and a corrosion-resistant hydrophobic filter material is installed in the pre-filter.

[0012] The pry-mounted gas separation membrane device provided by the present application, the suspension separator adopts a cyclone baffle separator.

[0013] The pry-mounted gas separation membrane device provided by the present application, the first dryer adopts a drying pipe, and the drying pipe is filled with a water absorbing agent.

[0014] The present application also provides a use method of the pry-mounted gas separation membrane device, comprising the following steps: Step one, the gas to be separated enters the filter drying system, and the solid particles and water in the raw gas; Step two, after drying, the gas enters the secondary cooling system to reduce the temperature, so that the easily condensed components in the gas are liquefied; Step three, after cooling, the gas enters the suspension separator to remove the liquefied components in the gas; Step four, after suspension separation, the gas is compressed to high-pressure gas by the compression system and is transported to the gas storage tank; Step five, the high-pressure gas in the gas storage tank is cooled to a set temperature by the heat exchanger; Step six, after cooling, the high-pressure gas enters the membrane assembly, is separated and purified by the membrane separator, and is discharged outside.

[0015] The present application discloses the following technical effects: The present application detachably connects the filter drying system, the secondary cooling system, the suspension separator, the compression system, the gas storage tank and the membrane assembly on the pry body, realizes the compactness and portability of the equipment through the pry structure, significantly reduces the floor area and transportation cost, is suitable for small oil and gas fields and complex terrain, can realize simple replacement of the filter drying system, the secondary cooling system, the suspension separator, the compression system, the gas storage tank and the membrane assembly, facilitates the maintenance operation of the operator, has the operation function of large gas separation membrane equipment, can meet the performance test requirements of the gas separation membrane assembly, and can also optimize the process parameters of the gas separation membrane equipment; The present application switches the on-off of the main pipeline and the first branch pipeline and the main pipeline and the second branch pipeline through the first manual reversing valve, when switching to the communication of the main pipeline and the first branch pipeline, the gas is filtered twice through the two membrane separators in turn, when switching to the communication of the main pipeline and the second branch pipeline, the gas is filtered once through the two membrane separators at the same time, which simplifies the adjustment mode of the membrane separation process; the first manual reversing valve is used to realize the mode switching of the membrane assembly, which is convenient for performance test and efficiency optimization, and provides convenience for experimental research and industrial application; The present application can be used for evaluating the separation performance, long-term operation stability, physical / chemical aging, pollution resistance and other performances of the gas separation membrane assembly in natural gas purification, biogas separation, helium / methane, helium / nitrogen, air dehydration, hydrogen / nitrogen, hydrogen / methane, hydrogen / carbon dioxide, air separation (O2 / N2) and other gas mixed systems. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a structural schematic diagram of the present application; Figure 2It is a structure schematic diagram of the membrane assembly in the application; Figure 3 It is a structure schematic diagram of the secondary cooling system in the application; Figure 4 It is a structure schematic diagram of the compression system in the application.

[0018] Wherein, 1, an air inlet valve; 2, a pre-filter; 3, a first dryer; 4, a first heat exchanger; 5, a second heat exchanger; 6, a refrigerating machine; 7, a second dryer; 8, a suspension separator; 9, a compression system; 10, a first manual reversing valve; 11, a membrane device; 12, a second manual reversing valve. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0020] In order to make the above object, characteristics and advantages of the application more obvious and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0021] Reference Figures 1-4 The application provides a pry-mounted gas separation membrane device, which comprises a pry body, a filter drying system, a secondary cooling system, a suspension separator 8, a compression system 9, a gas storage tank and a membrane assembly are detachably connected to the pry body; the filter drying system, the secondary cooling system, the suspension separator 8, the compression system 9, the gas storage tank and the membrane assembly are sequentially communicated through pipelines; The filter drying system is used for filtering solid particles and moisture in raw gas, the secondary cooling system is used for cooling the raw gas, the suspension separator 8 is used for removing liquefied components in the raw gas, and the compression system 9 is used for compressing the raw gas into high-pressure gas; The membrane assembly comprises a main pipeline and two membrane devices 11, the main pipeline is connected with a first branch pipe and a second branch pipe through a first manual reversing valve 10, the two membrane devices 11 are spaced apart on the first branch pipe, one end of the second branch pipe is communicated with the first branch pipe between the two membrane devices 11, and the main pipeline is communicated with the gas storage tank; Wherein, a monitoring system is installed on the pipeline, the main pipeline, the first branch pipe and the second branch pipe, and the monitoring system is used for monitoring gas components, temperature, pressure and flow; the membrane device 11 adopts a hollow fiber membrane assembly, and two membrane assemblies are contained. The area of each membrane assembly can be the same or different. Each membrane assembly contains an effective membrane area of 1-100 square meters, a design maximum pressure of 1.0-10.0 MPa, and a design air inlet temperature of-20℃ to 90℃.

[0022] Thus, the application detachably connects the filter drying system, the secondary cooling system, the suspension separator, the compression system, the gas storage tank and the membrane assembly on the pry body, realizes the compactness and portability of the equipment through the pry structure, significantly reduces the floor area and transportation cost, is suitable for small oil and gas fields and complex terrains, can realize the simple replacement of the filter drying system, the secondary cooling system, the suspension separator, the compression system, the gas storage tank and the membrane assembly, facilitates the maintenance operation of the operator, has the operation functions of large gas separation membrane equipment, can meet the performance test requirements of the gas separation membrane assembly, and can optimize the process parameters of the gas separation membrane equipment. The application switches the on-off of the main pipeline and the first branch pipeline and the main pipeline and the second branch pipeline through the first manual reversing valve 10, when switched to the communication of the main pipeline and the first branch pipeline, the gas is filtered twice through the two membrane devices 11 in sequence, when switched to the communication of the main pipeline and the second branch pipeline, the gas is filtered once through the two membrane devices 11 at the same time, which simplifies the adjustment mode of the membrane separation process; the first manual reversing valve 10 is used to realize the mode switching of the membrane assembly, which is convenient for performance test and efficiency optimization, and provides convenience for experimental research and industrial application; the two membrane devices 11 are connected with external equipment through the exhaust pipes; The application can be used for evaluating the separation performance, long-term operation stability, physical / chemical aging, pollution resistance and other performances of the gas separation membrane assembly in the gas mixed systems such as natural gas purification, biogas separation, helium / methane, helium / nitrogen, air dehydration, hydrogen / nitrogen, hydrogen / methane, hydrogen / carbon dioxide, air separation (O2 / N2) and the like.

[0023] In a further optimization scheme, the filter drying system comprises a pre-filter 2 and a dryer group, one end of the pre-filter 2 is communicated with a gas collection station through a feed pipe, the other end is communicated with the dryer group, the dryer group is communicated with the secondary cooling system through a pipeline, and an air inlet valve 1 is installed on the feed pipe; the air inlet valve 1 is a normally open valve. In the embodiment, the pre-filter 2 selects a specification with a volume of 10-100L, an air suction pressure of 0.3-0.4MPa, and a working pressure of 1.0MPa-10.0MPa, and is used for separating large particle solids and part of crude oil materials that cannot pass through the filter screen in the raw material gas.

[0024] In a further optimization scheme, the dryer group comprises two drying branches, the two drying branches are communicated with the discharge end of the pre-filter 2 through a second manual reversing valve 12, a first dryer 3 is installed on each of the two drying branches, and the two drying branches are communicated with a pipeline.

[0025] Further optimization scheme, the secondary cooling system includes the first heat exchanger 4, the second heat exchanger 5 and the refrigerator 6;The first heat exchanger 4 and the second heat exchanger 5 are connected with the refrigerator 6 through refrigeration pipeline;The first heat exchanger 4 and the second heat exchanger 5 are installed on the pipeline at intervals, and the second dryer 7 is installed between the second heat exchanger 5 and the suspension separator 8; The refrigerator 6 is a low-temperature water chiller, which has a refrigeration capacity of 1.4-10kW at-20℃, which can meet the refrigeration capacity required by the device. The two plate heat exchangers (the first heat exchanger 4 and the second heat exchanger 5) are connected in series in the application, and the plate heat exchanger is selected by using the excess amount design in order to reduce the increase of the total heat transfer coefficient and the increase of the heat exchange area. In addition, the application adopts the counterflow heat exchange method to connect the hot flow and the cold flow. The hot flow gas enters the plate heat exchanger from top to bottom, and the refrigerant is connected to the right lower inlet of the first plate heat exchanger from the outlet of the cold machine, which is the cold flow inlet. This design uses the heat exchange form of the counterflow heat exchanger, which can improve the heat exchange coefficient.

[0026] Further optimization scheme, the monitoring system includes a plurality of pressure gauges, a plurality of temperature transmitters, a plurality of gas component sensors and a plurality of flow sensors; The pressure gauges, temperature transmitters and gas component sensors are installed on the main pipeline, the gas component sensors and flow sensors are installed on the first branch pipe and the second branch pipe, and the pressure gauges, temperature transmitters and gas component sensors are installed on the pipeline between the drying branch and the first heat exchanger 4; The gas component sensor can be one or more of hydrogen, helium, CO2, CO, CH4, O2, N2, H2O and other common gas detectors; The temperature transmitter is used to measure the temperature of the fluid; The pressure gauge is used to measure the pressure of the fluid; The flow sensor is a mass or volume flowmeter.

[0027] Further optimization scheme, the compression system 9 adopts a double-stroke natural gas compressor, with a gas flow of 10-50Nm 3 / h, an inlet pressure of 0.1-0.5MPa, an exhaust pressure of 1.0-10.0MPa, a power of 2.2-22kw, a rotating speed of 720-1500rpm and CT4 explosion-proof.

[0028] Further optimization scheme, the pre-filter 2 adopts a straight-through blue filter, and the pre-filter 2 is provided with a corrosion-resistant hydrophobic filter material, and in the embodiment, a PTFE filter screen is used.

[0029] Further optimization scheme, the suspension separator 8 adopts cyclone baffle separator, cyclone baffle separator uses five-stage separation technology, comprehensive speed reduction, centrifugal, collision, change direction, condensation and other physical principles, effectively remove the liquid water and solid particles in compressed air, realize gas purification.After the wet gas is cooled and condensed, the baffle in the suspension separator 8 guides the gas to change direction twice and makes it rotate at a certain speed, so that the centrifugal force generated can quickly separate the liquid and particles.The separated condensate needs to be discharged in time through the drain to ensure the continuous and efficient operation of the equipment.

[0030] Further optimization scheme, the first dryer 3 adopts a drying tube filled with water absorbing agent, the drying tube has a diameter of 50mm, a total length of 260mm, and a maximum working pressure of 1.0MPa-10MPa.Each drying tube capacity: about 250g water absorbing agent, water absorbing agent contains silica gel particles, calcium chloride, aluminum oxide, molecular sieve, activated carbon, mass ratio (1:1:1:1:1), layered and added in turn.

[0031] In the present application, the gas to be separated is input from the gas collection station to the gas inlet, and the pre-filter 2 after the gas inlet valve 1 can filter out the solid particles carried in the gas to be separated through the filter screen of the basket pre-filter. Then the gas to be separated enters the dryer group, which is connected in parallel, and a second manual reversing valve 12 is placed in front, which is used to switch to another first dryer 3 after the first dryer 3 on one side is saturated.Then the cooling system is connected, which can cool the gas to about-20℃.

[0032] At this time, the easily condensable substances in the gas will be liquefied at this temperature, but the high carbon content in this process is less, which will be carried in the mixed gas. Therefore, the second dryer 7 is placed behind to absorb the water with low dew point. When the mixed gas (containing a small part of high carbon suspension) enters the suspension separator 8, the gas contacts the inner surface of the suspension separator 8, the liquid adheres to the inner surface, and the gas goes out from below to above, realizing gas-liquid separation. Finally, the gas enters the compression system 9, is pressurized and heated, and is stored again in the gas tank below the compression system 9, which can save the gas pressure to stabilize the gas inlet, reduce the fluctuation peak.

[0033] The application can switch the connection mode of the two membrane devices 11 from series to parallel or vice versa by changing the flow path direction through the first manual reversing valve 10. In the series mode, the gas passes through the two membrane assemblies in turn, which is suitable for scenarios requiring multi-stage separation. In the parallel mode, the gas passes through the two membrane assemblies simultaneously, which is suitable for improving the processing capacity or contrast performance. This design enables the same device to quickly switch the connection mode, facilitating the comparison of the separation efficiency, flux, and other key parameters of the membrane assemblies under different configurations, thereby more comprehensively evaluating the performance of the membrane device. When experimental evaluation of a single membrane device is required, only the parallel mode needs to be switched, and the experimental results of the two membrane devices can be directly obtained. Temperature, pressure, and flow transmitters are also provided before and after the membrane device, facilitating data transmission to the control console for experimental operation and data recording.

[0034] The application also provides a use method of the skid-mounted gas separation membrane device, comprising the following steps: Step one, the gas to be separated enters the filtration and drying system, and the solid particles and water in the raw gas are removed; Step two, the dried gas enters the secondary cooling system to be cooled to -20°C, liquefying the condensable components such as alkanes, alkenes, and benzene in the gas; Step three, the cooled gas enters the suspension separator 8 to remove the liquefied components in the gas; Step four, the gas after suspension separation is compressed to high-pressure gas (1 MPa-10 MPa) by the compression system 9 and is transported to the gas storage tank; Step five, the high-pressure gas in the gas storage tank is cooled to a set temperature by the heat exchanger; Step six, the cooled high-pressure gas enters the membrane assembly, is separated and purified by the membrane device 11, and is discharged outside to obtain product gas.

[0035] In the description of the application, it should be understood that the orientations or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0036] Obviously, the above embodiments of the application are only examples for clearly illustrating the application, and are not intended to limit the implementation modes of the application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all implementation modes do not need to be exhausted. Any modification, equivalent replacement, and improvement made within the spirit and principle of the application should be included in the protection scope of the claims of the application.

Claims

1. A skid-mounted gas separation membrane device, characterized in that, Includes a skid, on which a filtration and drying system, a secondary cooling system, a suspension separator (8), a compression system (9), a gas storage tank, and a membrane module are detachably connected; the filtration and drying system, the secondary cooling system, the suspension separator (8), the compression system (9), the gas storage tank, and the membrane module are connected in sequence through pipelines; The filtration and drying system is used to filter solid particles and moisture in the raw gas, the secondary cooling system is used to cool the raw gas, the suspension separator (8) is used to remove liquefied components in the raw gas, and the compression system (9) is used to compress the raw gas to high pressure. The membrane assembly includes a main pipe and two membrane units (11). The main pipe is connected to a first branch pipe and a second branch pipe through a first manual reversing valve (10). The two membrane units (11) are spaced apart on the first branch pipe. One end of the second branch pipe is connected to the first branch pipe between the two membrane units (11). The main pipe is connected to the gas storage tank. Monitoring systems are installed on the pipeline, the main pipeline, the first branch pipe, and the second branch pipe. These monitoring systems are used to monitor gas composition, temperature, pressure, and flow rate.

2. The skid-mounted gas separation membrane device according to claim 1, characterized in that: The filtration and drying system includes a pre-filter (2) and a dryer assembly. One end of the pre-filter (2) is connected to the gas collection station through a feed pipe, and the other end is connected to the dryer assembly. The dryer assembly is connected to the secondary cooling system through the pipeline. An air inlet valve (1) is installed on the feed pipe.

3. The skid-mounted gas separation membrane device according to claim 2, characterized in that: The dryer assembly includes two drying branches, which are connected to the discharge end of the pre-filter (2) via a second manual reversing valve (12). A first dryer (3) is installed on each of the two drying branches, and both drying branches are connected to the pipeline.

4. The skid-mounted gas separation membrane device according to claim 3, characterized in that: The secondary cooling system includes a first heat exchanger (4), a second heat exchanger (5), and a refrigerator (6); the first heat exchanger (4) and the second heat exchanger (5) are both connected to the refrigerator (6) through refrigeration pipelines; the first heat exchanger (4) and the second heat exchanger (5) are installed at intervals on the pipelines, and a second dryer (7) is installed between the second heat exchanger (5) and the suspension separator (8).

5. The skid-mounted gas separation membrane device according to claim 4, characterized in that: The monitoring system includes several pressure gauges, several temperature transmitters, several gas composition sensors, and several flow sensors. A pressure gauge, a temperature transmitter, and a gas composition sensor are installed on the main pipeline. Gas composition sensors and flow sensors are installed on the first branch pipe and the second branch pipe. A pressure gauge, a temperature transmitter, and a gas composition sensor are installed on the pipeline between the drying branch and the first heat exchanger (4).

6. The skid-mounted gas separation membrane device according to claim 1, characterized in that: The compression system (9) uses a two-stroke natural gas compressor.

7. The skid-mounted gas separation membrane device according to claim 2, characterized in that: The pre-filter (2) is a straight-through basket filter, and the pre-filter (2) is equipped with corrosion-resistant and hydrophobic filter material.

8. The skid-mounted gas separation membrane device according to claim 1, characterized in that: The suspension separator (8) is a cyclone baffle separator.

9. The skid-mounted gas separation membrane device according to claim 3, characterized in that: The first dryer (3) uses a drying tube filled with a desiccant.

10. A method of using a skid-mounted gas separation membrane device, based on the skid-mounted gas separation membrane device according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: The gas to be separated enters the filtration and drying system, separating the solid particles and moisture in the raw gas; Step 2: After drying, the gas enters the secondary cooling system to cool down, causing the easily condensable components in the gas to liquefy; Step 3: After cooling, the gas enters the suspension separator (8) to remove the liquefied components from the gas; Step 4: The gas after suspension separation is compressed into high-pressure gas by the compression system (9) and transported to the gas storage tank; Step 5: The high-pressure gas in the storage tank is cooled to the set temperature through a heat exchanger; Step 6: After the high-pressure gas is cooled, it enters the membrane module, is separated and purified by the membrane device (11), and is discharged to the outside.

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