CN112627287B - Device and method for directly preparing liquid water from air - Google Patents
Device and method for directly preparing liquid water from air Download PDFInfo
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- CN112627287B CN112627287B CN202011467940.3A CN202011467940A CN112627287B CN 112627287 B CN112627287 B CN 112627287B CN 202011467940 A CN202011467940 A CN 202011467940A CN 112627287 B CN112627287 B CN 112627287B
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/28—Methods or installations for obtaining or collecting drinking water or tap water from humid air
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/152—Water filtration
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- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
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- Hydrology & Water Resources (AREA)
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Abstract
The invention belongs to the technical field of gas separation, and particularly relates to a device for preparing liquid water by directly separating water vapor from air. The device of the invention comprises: filters, blowers, composite membrane separators, compressors, condensers, and some control valves and necessary piping. The air containing wet raw materials firstly enters a filter to filter out particles, and then is sent into a composite membrane separator through an air blower, low-partial pressure water vapor firstly contacts an adsorption layer of the composite membrane to be adsorbed and enriched, and the low-partial pressure water vapor preferentially permeates the membrane separator under the action of separation power provided by a compressor and is output as water vapor through an outlet of the compressor, liquid water can be continuously and efficiently obtained through a condensation technology, and the poor water vapor is discharged out of a system from the retention side of the membrane separator. Compared with the conventional method of only using a membrane separation method or only using an adsorption separation method, or directly using compression, condensation and the like, the method has higher efficiency, and the separation process can be continuously carried out.
Description
Technical Field
The invention belongs to the technical field of gas separation, and particularly relates to a device and a method for preparing liquid water from air.
Background
Due to large-scale mining and environmental destruction of human beings and climate abnormity brought by the damage, extremely uneven distribution of water resource time and space in China and aggravation of water body pollution, surface water resources are seriously deficient, especially in some arid areas, desert areas, water-deficient areas in the west, islands, coastal moist areas, areas lacking fresh water, special operation modes and environments such as field scientific investigation, border military stations, high mountain radar stations and the like, fresh water supply is very difficult, and in the areas, the main mode of obtaining water depends on a small amount of rainfall accumulation or base replenishment, so that inconvenience, instability or high cost are caused, and the bottleneck problem of restricting the economic and social development of the areas is caused.
The current method for solving the problem of fresh water shortage in local areas mainly comprises the following steps: (1) the method comprises the following steps of (1) sending water and mechanically supplying in different places, (2) obtaining drinking water by methods such as purification and seawater desalination depending on surface water sources, but the problems of the fresh water sources in specific areas and specific application environments cannot be solved fundamentally and well due to the fact that the surface water sources are used as the basis:
(1) the remote water supply and the mobile supply are not only limited by the transportation conditions, but also have high transportation cost;
(2) the technology depends on the surface water source for recycling by adopting a purification method, is not only limited by the existence of non-purifiable toxins and the existence of non-purifiable toxins of the surface water source, but also has high purification treatment cost, such as a high mountain radar station, can only rely on water storage for purifying to obtain drinking water and drink water at every day, and also bears high cost, such as seawater desalination.
In fact, the atmosphere is a huge fresh water reservoir, water vapor in the air is clean and renewable, and the air can become an important water source for obtaining fresh water under the condition of no surface water source, for example, even in a sahara desert, the annual average relative humidity is about 20-30%, the humidity in the air at night is higher, and the water vapor in the air is separated and converted into liquid water, so that the water can be used by people living or working in the specific area and the specific environment.
Chinese patent CN1131359C describes an "adsorption type air water intake device", which mainly comprises an adsorption bed, a condenser, a water purification system and a water storage device, and uses a specific adsorbent to enhance the water intake effect, and uses a specific adsorption bed and a condenser structure including a heater to enhance the heat transfer of the adsorbent and the heat exchange of the condenser, and to enhance the water intake efficiency by using waste heat or natural energy, so as to realize the process of taking water from air in a multiple cycle in one day.
Chinese patent CN 101851946B describes a "water making method and device using separation membrane to enrich air water vapor", which comprises a main air water making device and an auxiliary air water making device, wherein the main air water making device comprises a main water making air pretreatment device, a membrane dehumidification component, a sweep gas pressure reducing valve, a dehumidified air precooler, a dehumidified air expander, a sweep gas precooler, a main water making device and a water tank, the auxiliary air water making device comprises an auxiliary water making air induced draft fan, an auxiliary water making air filter and an auxiliary water making device, and continuous water making is ensured by specific process connection, technical defects of adsorption method enriched water vapor water making are overcome, the separation membrane is used to enrich the water vapor in the air, and the enriched gas is cooled to make liquid water, however, the method only uses membrane separation technology to separate the water vapor from the mixed gas with very low water vapor partial pressure in the atmosphere, the membrane separation process is enhanced by providing a sweep gas form to the permeation side of the membrane separator in order to improve the water production and water production efficiency, but the application of the membrane separation process is limited due to high energy consumption and complex system of a positive pressure type membrane separation process which is carried out under higher pressure (typically, air is boosted to 4-15 bar pressure by a compressor), typically, the pressure ratio of the compressor boosted to 7bar pressure reaches (7 + 1)/1 =8 times, the energy consumption is very high, and particularly, the scheme is difficult to efficiently produce water in a low-humidity arid region.
Disclosure of Invention
The invention aims to overcome the technical defect of enriching water vapor from air by a simple adsorption method or a membrane separation method or directly adopting a compression condensation method to prepare water, and provides a device and a method for continuously and efficiently preparing liquid water from air (containing moisture) directly, wherein the device has a compact structure.
The method and the device for directly preparing the liquid water from the air are different from the simple membrane separation process or the adsorption separation process in the prior art, and a brand-new and high-efficiency continuous separation process method and the device based on complete coupling of adsorption and membrane separation materials are formed by organically combining the membrane separation technology and the adsorption separation technology; and the coupling separation process is organically combined with the conventional compression condensation process, and can efficiently meet the requirement of water production from air in various humidity environments.
The structure of the device for directly preparing liquid water from air provided by the invention is shown in figure 1, and the device comprises:
(1) preferably, but not necessarily, at least one filter AF 01; used for filtering out impurities such as dust in the air;
(2) at least one first pressure raising device AB01 arranged in front of the composite membrane separator for raising the pressure of the raw material gas to a certain pressure and sending the raw material gas to the composite membrane separator; the pressure boosting equipment can also be placed behind the composite membrane separator to exhaust the retained gas exhausted from the composite membrane separator; typically, the first pressure boosting device AB01 may employ a blower;
(3) at least one second pressure increasing means AB02 for establishing a transmembrane pressure ratio across the membrane separator; typically, the second pressure increasing device AB02 may employ a compressor;
(4) at least one group of composite membrane separators M01A, which are made of composite membrane material loaded with adsorption separation material;
the composite membrane separator M01A has a positive pressure side, also referred to as the feed gas side, i.e., the adsorption separation layer contact side, also referred to as the high pressure side, the retentate gas side;
the composite membrane separator M01A has a negative pressure side, also known as the permeate side, i.e., the membrane separation layer contact side, also known as the low pressure side;
the raw gas side of the composite membrane separator M01A is connected with an outlet of a first pressure boosting device AB01, and the retentate gas side is discharged to the atmosphere; when a plurality of groups of composite membrane separators are arranged, the raw material gas side of the composite membrane separators can be connected with a first pressure boosting device in parallel and is intensively or respectively discharged to the atmosphere; the permeation side of the composite membrane separator M01A is connected to the inlet of a second pressure boosting device AB02 in a gathering manner;
(5) at least one set of control valves and necessary pipelines for feeding raw air to the raw gas side of the composite membrane separator;
(6) at least one group of control valves and necessary pipelines for discharging the water vapor enriched at the permeation side of the composite membrane separator to the inlet of the compressor;
(7) at least one set of devices (not shown in the drawing) such as a condenser, a purifier and the like connected to the outlet of the second pressure boosting device AB02 (such as a compressor) is used for condensing and purifying the water vapor at the outlet of the second pressure boosting device AB 02; here, liquid water is prepared by a compression and condensation method; the conventional compression condensation process is organically combined, and the process is combined, so that water can be produced from air in various humidity environments with high efficiency, and the environmental adaptability is improved.
In the present invention, the membrane separation material is divided into three layers: one layer is an adsorption separation layer which can be composed of organic and inorganic hydrophilic adsorption materials capable of adsorbing and enriching water and regenerating, and contacts with the positive pressure side of the membrane separator; one layer is a membrane separation layer which can be made of all separation materials with selectivity to moisture/air, such as silicon rubber, maple and the like, and contacts the negative pressure side of the membrane separator; one layer is a porous support layer and is positioned between the adsorption separation layer and the membrane separation layer, and the support layer can not only support the adsorption separation material, but also can coat the membrane separation layer, so that the membrane separator made of the composite separation material is obtained.
In the invention, one end of the positive pressure side of the composite membrane separator M01A is provided with a raw material gas inlet A0, and the other end of the positive pressure side of the composite membrane separator M01A is provided with a retained gas outlet A1; the negative pressure side of the composite membrane separator M01A is provided with a permeation side outlet A2-1, namely a water vapor outlet.
In the invention, the device also comprises a pressure monitoring device PE01 for monitoring the pressure at the inlet of the second pressure boosting device AB 02; the pressure monitoring device PE01 may be installed anywhere that reflects the pressure of the gas entering the second pressure boosting device in real time, and may be a pressure-sensitive or any other type of pressure monitoring device.
As is known in the art, the apparatus of the present invention also includes the necessary control components to enable the operation of the system power plant, the control valves to be switched as required, and the like.
Based on the device for preparing the liquid water from the humid air, the liquid water can be efficiently and continuously prepared from the air. According to the attached drawings, the specific operation steps are as follows:
(1) the wet raw material air firstly enters a filter AF01, and impurities such as dust and the like are filtered by a filter AF 01; then, controlling the first pressure boosting device AB01 to boost pressure to 100 pa-15 Kpa, and providing a sufficient separation air quantity by overcoming the flow resistance of the composite membrane separator M01A;
(2) the wet air treated in the step (1) enters a composite membrane separator M01A from a raw material gas inlet A0: because the composite adsorption material in the composite membrane separator M01A is a porous and hydrophilic material, the water vapor in the mixed gas component to be separated has adsorption; the composite membrane separator M01A adsorbs and enriches the moisture in the incoming air, a vacuum pressure of-10 to-30 KPa is provided at the permeation side of the composite membrane separator M01A by the second pressure boosting device AB02, a transmembrane pressure difference is formed at two sides of the composite membrane separator M01A, namely a high pressure side and a permeation side, under the suction of the pressure difference, two sides of the hydrophilic adsorption separation layer contact with the incoming air at one side to adsorb the moisture, the other side contacts with the supporting layer and is connected with the membrane separation layer and the negative pressure side to continuously desorb the moisture to obtain continuously regenerated enriched water vapor, the water vapor is output through the outlet of the second pressure boosting device AB02 preferentially to enter the condenser, and the water vapor is condensed in the condenser to form liquid water and is subjected to staticization by the staticizer;
meanwhile, because the membrane separator discharges at least a part of water vapor from the permeation side and discharges lean gas with less water vapor from the detention side of the membrane separator, the separation process is continuously carried out, is suitable for the incoming air with various humidity, particularly for preparing liquid water under the environment condition of low water partial pressure, and even under extreme working conditions such as desert areas, because the moisture content in the air is lower, a composite membrane separation technology carrying an adsorption separation material is adopted, and a better water preparation effect can be obtained. Meanwhile, in a high-humidity environment, the flowing air can be directly guided by a valve DDV03 arranged on a pipeline to be compressed and condensed to prepare water.
The water vapor discharged from the outlet of the second self-boosting device AB02 after separation can be continuously and efficiently used for obtaining drinking water by adopting the conventional well-known condensation technology.
In the present invention, the term lower partial pressure of water vapor refers to extreme conditions such as desert regions where the air humidity will be as low as 20% relative humidity.
The invention relates to a process method and a device for efficiently separating water vapor, which are more efficient than the conventional methods such as a simple membrane separation method, a simple adsorption separation method or a direct compression and condensation method, are a process method and a device which are constructed based on a composite membrane separator loaded with adsorption separation materials, have compact structure, can efficiently and continuously separate water vapor from humid air and prepare liquid water, and are the high organic coupling process of the technologies.
In the present invention, the selectivity, also referred to as the separation coefficient, α (alpha) value, is generally defined as:
α (alpha) value, selectivity of air component to water vapor = (Q water/Q dry air component);
wherein the dry air component and the water component of Q represent the permeation amounts of the pure components of the dry air component and the water vapor to be separated of the membrane separation material through the membrane material under the unit time and the pressure respectively, and the typical permeation amount ratio is 1 atmosphere, 20 ℃ and the alpha (alpha) value.
The membrane separation material used in the present invention is a membrane separation material having a separation coefficient of air components and water vapor of 50 to 5000.
In the present invention, the adsorbent (organic hydrophilic adsorbent, inorganic molecular sieve) used as the support layer means various types of adsorbents capable of adsorbing water and regenerating water.
Drawings
FIG. 1 is a schematic representation of the apparatus and method of the present invention for producing liquid water from air.
Reference numbers in the figures: AF01 is an air filter, DDV 01/DDV 02 and DDV03 are cut-off valves, AB01 is a first pressure boosting device, AB02 is a second pressure boosting device, TC01 is a condensing device, PE01 is a pressure monitoring device, M01A is a composite membrane separator, A0 is a raw gas inlet, namely a moisture-containing air inlet, of the membrane separator, A1 is a retentate gas outlet, namely a moisture-poor air outlet, and A2-1 is a negative pressure side, namely a permeation side outlet and a water vapor outlet of the membrane separator.
Detailed Description
The invention is further described below with reference to the accompanying drawings. As shown in fig. 1, wherein:
AF01 is an air filter that can be in various forms including fibrous form, filter media form, bag filter, preferably in a self-cleaning form or various combinations, for filtering and cleaning the feed air entering the separator to ensure the cleanliness requirements of the separator on the feed air.
The DDV01, DDV02 and DDV03 are automatic cut-off valves, and can be replaced by two-way valves with the same process purpose and required functions, can be various manual, automatic control and regulation stop valves, butterfly valves, gate valves and the like, preferably adopt various automatic regulating valves, and can be pneumatic, electric and hydraulically controlled automatic valves for switching, isolating and regulating the air to be separated entering and exiting the membrane separator; wherein, in the case of automatic regulating valves, they can be opened, regulated or closed according to preset logic and regulated in terms of flow, time, temperature, etc. according to monitored temperature (not shown), pressure, etc.
The AB01 is a first pressure raising device which can be various compression devices, such as piston type, centrifugal type, screw rod, vortex, Roots, liquid ring and the like, and raises the pressure of the gas to a proper pressure, wherein, the AB01 is used for raising the pressure of the component to be separated to the separation pressure needed by the component to enter the separator, and preferably, various blowers are adopted to raise the pressure of the moisture-containing air to be separated to 100 pa-15 Kpa, so as to overcome the flow resistance and provide the full amount of separated gas as the preferred design target, and the AB01 can also be arranged on a process pipeline (not shown in the figure) behind the membrane separator and before the adsorption separator.
AB02 is a second pressure increasing device, such as a compressor, used for reducing the pressure of the process gas from the negative pressure side of the membrane separator to the pressure required by separation and overcoming the compression condensation of the subsequent process and overcoming the resistance of fluid transportation, and typically, the suction pressure is-10 KPa to-50 KPa, the output pressure is 50KPa to 200KPa, and various compressors and blowers are preferably adopted.
PE01 is a pressure monitoring device for monitoring the pressure at the inlet of the compressor, and can be installed anywhere that reflects the pressure of the gas entering the compressor in real time, and can be a pressure-sensitive or any other form of pressure monitoring device.
M01A is a composite membrane separator, which can be a plate-type membrane, a roll-type membrane, a hollow fiber membrane, the membrane separation material is divided into at least three layers, one adsorption layer can be composed of hydrophilic adsorption materials which can adsorb and enrich water and can be regenerated, such as organic and inorganic materials, the adsorption layer can be contacted with the positive pressure side of the membrane separator, the other layer is a membrane separation layer can be composed of separation materials which have selectivity to water/air, such as silicon rubber and poly-maple, the negative pressure side of the membrane separator is contacted with the porous support layer which is positioned between the adsorption separation layer and the membrane separation layer, the support layer can carry the adsorption separation material and can also coat the membrane separation layer, the membrane separator made of the composite separation material is obtained, the positive pressure side is the raw material gas side (adsorption separation layer contact side) of the membrane separator, also is called the high pressure side and the gas retention side, the negative pressure side is the permeating side (membrane separation layer contact side) of the membrane separator, also referred to as the low pressure side.
Unlike the conventional art, in a typical separation process such as that using a roll-to-roll or plate separator, the AB01 is mainly used for supplying fresh air, overcoming the resistance of fluid delivery, typically increasing pressure by 100 Pa-1500 Pa, preferably establishing a wind pressure of 100 Pa-500 Pa to overcome the gas circulation resistance of the membrane separator, if the plate-type membrane is adopted, even the wind pressure of tens to hundreds of pascals is needed to be built, and the AB01 is placed behind the plate-type membrane to be used as an exhaust gas exhaust fan, the aim is only to overcome the resistance of raw air entering the membrane separator so as to continuously provide moisture-containing air, unlike other membrane separation processes which employ higher pressures, the present process generally has lower energy consumption by eliminating the need to compress the air to higher pressures (typically higher pressures such as to 7 bar).
Unlike conventional technology, the coupled separation process of the present invention allows the separation of water vapor to be continuous and more complete separation of water vapor from humid air as compared to other technologies, or, as compared to a single membrane separation process, allows the use of less membrane area, lower separation pressure, and less adsorbent as compared to a single adsorption separation process, and further, the present invention allows the use of power equipment such as blowers and compressors that are continuously operated during the separation process, resulting in a more efficient separation system that provides a very low partial pressure of water vapor in areas with very low moisture content, such as drought in a desert, which is a technical advantage in continuously obtaining water vapor.
Compared with the method for separating water vapor by adopting the adsorbent (molecular sieve) in the heating regeneration adsorption separator, the coupled separation process technology of the invention has the advantages that the compressor is used as a separation power source in the membrane separation process, and the continuous vacuum regeneration can be carried out on the adsorption separation material carried by the composite separator, so that the vacuum power is not only negligible compared with the energy source for heating regeneration, but also the system is simpler and more convenient.
The invention solves the technical defect of the low-pressure water vapor separation in the moisture-containing air by a membrane separation method or an adsorption separation method, has more efficiency, and compared with the adsorption separation process which is operated in an intermittent mode, the separation process is continuous without intermittent switching regeneration.
The invention also comprises equipment for condensing and purifying the water vapor at the outlet of the compressor, preferably heat exchange equipment which can optimize the heat exchange of raw air at the outlet of the compressor, can cool the water vapor at the outlet of the compressor more efficiently, is coupled to the main flow, can directly compress and condense water in a high-humidity area with the humidity of more than 80 percent, has stronger operation flexibility, and simultaneously does not exclude all measures for using waste gas heat energy and solar energy for accelerating the desorption of the adsorption separator so as to further improve the energy efficiency ratio.
The present invention is preferably applied to the separation of air containing wet components, but the basic principles disclosed can be applied to many other separation applications. Typical examples of separations that can be achieved by the process of the invention include oxygen/nitrogen separations, gas drying, carbon dioxide/methane separations, carbon dioxide/nitrogen separations, hydrogen/nitrogen separations, and olefin/alkane separations.
Example (b): a water preparation system of getting water from air connects according to the attached drawing, wherein, the membrane separator adopts MO-20 type plate membrane separator of the production of Shanghai Duffy materials science and technology Limited, its separation coefficient of dry air and water is 1850, the membrane area loading is 5.5m2, adopt the non-woven fabrics as the supporting layer to carry SSAT # HG55 hydrophilic material 0.5kg of the production of the Shanghai Duffy materials science and technology Limited, supporting selection type 1 flow 400m 3 The water content in the air is as follows when the following conditions of the environment temperature of 25 ℃ and the relative humidity RH20% in the air are operated, and 35L of drinking water can be prepared every day after water vapor at the outlet of the compressor is condensed:
the above described embodiments illustrate only some of the essential features of the invention, and it will be appreciated by those skilled in the art that although the invention has been described in part in connection with the accompanying drawings, this is merely an example of its application or a method, and that all other variations which do not depart from the essence of the invention are intended to be within the scope of the invention, which is limited only by the scope of the appended claims.
Claims (4)
1. An apparatus for producing liquid water directly from air, comprising:
(1) at least one filter (AF 01);
(2) at least one first boost device (AB 01); the first pressure boosting device is arranged in front of the composite membrane separator and used for boosting the pressure of the raw material gas to a certain pressure and sending the raw material gas to the composite membrane separator; or the first pressure boosting equipment is arranged behind the composite membrane separator and used for exhausting the retentate gas exhausted from the composite membrane separator;
(3) at least one second pressure boosting device (AB 02) to establish a transmembrane pressure ratio across the composite membrane separator;
(4) at least one group of composite membrane separators (M01A) made of composite membrane material carrying adsorption separation material; the composite membrane material is divided into three layers:
one layer is an adsorption separation layer which is composed of a hydrophilic adsorption material capable of adsorbing and enriching water and regenerating and contacts with the positive pressure side of the composite membrane separator;
one layer is a membrane separation layer, which is made of a separation material selective to moisture/air, and contacts the negative pressure side of the composite membrane separator;
one layer is a porous supporting layer and is positioned between the adsorption separation layer and the membrane separation layer, and the supporting layer can not only carry adsorption separation materials, but also can be coated with the membrane separation layer, so that the composite membrane separator made of the composite membrane material is formed;
the composite membrane separator has a positive pressure side, also called a raw material gas side, namely an adsorption separation layer contact side, also called a high pressure side and a retentate gas side;
the composite membrane separator has a negative pressure side, also known as the permeate side, i.e., the membrane separation layer contact side, also known as the low pressure side;
the raw gas side of the composite membrane separator is connected with an outlet of a first pressure boosting device (AB 01), and the retentate gas side is discharged to the atmosphere; when the composite membrane separators are a plurality of groups, the raw material gas side can be connected with a first pressure boosting device in parallel and is intensively or respectively discharged to the atmosphere;
the permeation side of the composite membrane separator is connected to the inlet of a second pressure boosting device (AB 02) in a gathering way;
(5) a control valve and its necessary piping for feeding raw air to the raw gas side of the composite membrane separator (M01A);
(6) a control valve and necessary pipelines for discharging the water vapor enriched at the permeation side of the composite membrane separator (M01A) to the inlet of the second pressure boosting device (AB 02);
(7) at least one group of condenser and purifier devices connected at the outlet of the second pressure boosting device (AB 02) and used for condensing and purifying the water vapor at the outlet of the second pressure boosting device (AB 02);
(8) necessary control components to enable the plant power equipment to operate, the control valves being switchable as required;
a raw material gas inlet (A0) is formed in one end of the positive pressure side of the composite membrane separator (M01A), and a retained gas outlet (A1) is formed in the other end of the positive pressure side of the composite membrane separator (M01A); the negative pressure side of the composite membrane separator (M01A) is provided with a permeation side outlet (A2-1), namely a water vapor outlet.
2. The apparatus for the direct extraction of liquid water from air according to claim 1, characterized in that it comprises a pressure monitoring device (PE 01) for monitoring the pressure at the inlet of the second pressure boosting device (AB 02); is installed at any position which can reflect the pressure of the gas entering the second pressure boosting device (AB 02) in real time.
3. The apparatus for the direct extraction of liquid water from air according to claim 2, characterized in that the first pressure boosting device (AB 01) is a blower and the second pressure boosting device (AB 02) is a compressor.
4. A method for directly preparing liquid water from air based on the device of claim 3, which is characterized by comprising the following steps:
(1) raw air firstly enters a filter (AF 01), and impurities such as dust are filtered by the filter (AF 01); then, controlling a first pressure boosting device (AB 01) to boost pressure to 100 pa-15 Kpa, and overcoming the flow resistance of the composite membrane separator (M01A) to provide a full amount of separated air;
(2) the air treated in the step (1) enters a composite membrane separator (M01A) from a raw material gas inlet (A0): controlling a second pressure boosting device (AB 02) to provide vacuum pressure of-10 KPa to-30 KPa on the permeation side of the composite membrane separator (M01A), forming transmembrane pressure difference on two sides of the composite membrane separator (M01A), namely a high pressure side and the permeation side, under the suction of the pressure difference, on two sides of a hydrophilic adsorption separation layer, one side is contacted with incoming air to adsorb moisture, and the other side is contacted with a support layer and is connected with the membrane separation layer and a negative pressure side, and continuously desorbing moisture to obtain continuously regenerated enriched water vapor; the water vapor is output through a second pressure boosting device (AB 02) from a preferential permeation composite membrane separator (M01A) and enters a condenser, and the water vapor is condensed in the condenser to form liquid water and is purified by a purifier;
(3) at the same time, the composite membrane separator (M01A) discharges a portion of the water vapor from the permeate side, while the lean gas, which contains less water vapor, is discharged at the retentate side of the composite membrane separator (M01A), allowing the separation process to be continuous.
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| US7972416B2 (en) * | 2008-02-19 | 2011-07-05 | Gas Technology Institute | Method and apparatus for humidifying air with water vapor extracted from moisture-laden flue gas |
| CN101851946B (en) * | 2010-05-18 | 2012-06-06 | 南京航空航天大学 | Water generating method by utilizing separating membrane to enrich air water vapor and device thereof |
| CN102730645B (en) * | 2012-07-10 | 2014-07-09 | 中国舰船研究设计中心 | Method for preparing oxygen by separating gas from liquid |
| CN203525542U (en) * | 2013-10-13 | 2014-04-09 | 上海穗杉实业有限公司 | Device for preparing liquid water from air |
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