CN101851946B - Water generating method by utilizing separating membrane to enrich air water vapor and device thereof - Google Patents

Abstract

The invention discloses a water production method and device for enriching air water vapor by using a separation membrane. The water production method adopts a membrane dehumidification component, uses a compression method to perform air dehumidification treatment, and then penetrates into the water vapor of the membrane dehumidification component through a pipeline. The side input purge gas realizes the enrichment of water vapor, and finally condenses the aforementioned high-humidity purge gas enriched with water vapor to obtain liquid or solid water. Therefore, compared with the adsorption method, the present invention has a continuous working process, No corrosion problem, easy maintenance, low energy consumption; the refrigerant used is air, so there is no pollution problem, and the compressor and expander are both centrifugal machines with high speed, so the equipment is small in size and light in weight per unit of water production ; At the same time, in order to improve system performance, the low-temperature water vapor cooling medium at the outlet of the cold side channel of the main water generator is reintroduced into the cold side channel of the auxiliary water generator to cool the air from the atmospheric environment and obtain additional water.

Description

Water production method and device for enriching air water vapor by using separation membrane

technical field

The invention belongs to the technical field of dehumidification, and relates to a water production method and a device thereof, in particular to a method and a device for producing liquid water from air by using a separation membrane. the

Background technique

When people work in arid areas, especially in desert areas for a long time, fresh water supply is a prerequisite for all activities in such areas. Generally, the way to obtain water is mainly to rely on a small amount of rainfall accumulation or replenishment from the base, so the amount of water obtained Unstable or expensive. In fact, the air contains a certain amount of water vapor. For example, the annual average relative humidity of the Sahara Desert is about 20-30%, and the humidity in the air at night is even greater. The steam is converted into liquid water, which can be used by people who work in dry areas for a long time, especially suitable for field research stations, border military stations, etc. the

The only way to convert water vapor into liquid water is to condense, but the following two methods are usually used. The first type is to directly cool the air below the dew point temperature, and the water vapor in the air will be converted into liquid water or solid ice. (Frost), although the principle of this type of method is simple, but due to the need to cool down the dry air and water vapor as a whole, the dry air after cooling is actually useless, and the lower the water vapor content in the air, the lower the dew point temperature. Therefore, the energy consumption is very huge; the other type is to enrich the water vapor in the air first, and then condense it, such as using an adsorption method to make the air pass through the adsorption material, and the water vapor in the air is attached to the adsorbent until it reaches a certain concentration , and then heat the adsorbent, and the water vapor will diffuse into the air. At this time, the water vapor content in the air is very high, and the dew point temperature is also high, so the cooling capacity required to convert the water vapor in the air into liquid water will also increase. Therefore, it is a better process to separate the water vapor in the air to achieve the purpose of enrichment, and then convert it into liquid water by condensation. the

However, the regeneration process of the adsorbent is cumbersome, and the regeneration process needs to consume a lot of heat energy, especially when the water vapor content in the air is low, to obtain a certain amount of water, a large amount of air needs to pass through the adsorbent, so the volume of the adsorption equipment is also large. It is very large, and in order to ensure the continuity of the water production process, each of the adsorption process and the regeneration process requires a set of equipment, and the two operate alternately, which undoubtedly further increases the volume and weight of the equipment. the

Contents of the invention

The purpose of the present invention is to overcome the technical disadvantage of enriching water vapor by adsorption method to produce water, and provide a method of using separation membrane to enrich water vapor in the air, and then cooling the enriched gas to produce liquid water. the

The purpose of the present invention is to solve through the following technical solutions:

A method for producing water by using a separation membrane to enrich air water vapor, comprising the following steps: (1) air pretreatment using an air filter and a compressor to remove impurities and compress the air; (2) separation treatment of air water vapor Use membrane dehumidification components to dehumidify the compressed air treated in step (1) to obtain dehumidified air and water vapor on both sides of the membrane; (3) condensed water condensation Use the sweeping gas method to introduce the sweeping gas into the step ( 2) The water vapor permeation side of the middle membrane dehumidification module sweeps the water vapor on the surface of the membrane wall to obtain high-humidity purge gas and realize the enrichment of air water vapor; at the same time, the dehumidified air obtained in step (2) passes through After cooling and expansion, it is used as a water vapor cooling medium to condense the obtained high-humidity purge gas to obtain condensed water; (4) the condensed water is collected from the condensed water treated in step (3), if it is liquid water, directly pass through The water pump is pumped into the water tank; if it is solid water, the condensed water is first melted into liquid water with a thawing medium, and then pumped into the water tank through the water pump. the

Further, the sweeping gas used in step (3) is derived from dehumidified air, and its usage is 10-30% of the mass fraction of the dehumidified air. the

Further, the thawing medium in step (4) is compressed air pretreated in step (1). the

Further, in step (3), after the water vapor cooling medium cools the high-humidity purge gas, it is used as a secondary cooling medium to cool the auxiliary water-cleaned air that has been treated by the air filter to remove impurities again, so as to Liquid or solid water is obtained; at the same time, the secondary cooling medium after cooling the auxiliary water and impurity-removing air is used as the compressed air cooling medium again to cool the compressed air in step (3). the

Another object of the present invention is to provide a water production device that realizes the above-mentioned water production method that utilizes separation membranes to enrich air water vapor. The water vapor permeation side of the dehumidification component inputs the purge gas to realize the enrichment of water vapor, and finally condenses the aforementioned high-humidity purge gas enriched in water vapor to obtain liquid or solid water. the

For realizing above technical purpose, the present invention will take following technical scheme:

A water production device that utilizes a separation membrane to enrich air water vapor, comprising an air main water production device, the air main water production device includes a main water production air pretreatment device, a membrane dehumidification component, a purge gas pressure reducing valve, a dehumidified air Precooler, dehumidifying air expander, purge gas precooler, main water generator and water tank, the main water air pretreatment device includes main water air filter and main water air compressor connected in sequence , the air inlet of the main water-making air filter is connected with the outside air, the high-pressure air inlet of the membrane dehumidification component is connected with the air outlet of the main water-making air compressor, and the high-pressure gas outlet of the membrane dehumidification component , the hot side channel of the dehumidifying air precooler, the dehumidifying air expander and the inlet of the cold side channel of the main water generator are connected sequentially. , the hot side channel of the purge gas precooler, the hot side channel of the main water generator, and the water tank are connected in sequence, and the air inlet of the purge gas pressure reducing valve is connected with the purge gas delivery pipe. In addition, the dehumidification air pre-cooler Cooling medium flows through the cold side channels of the cooler and the purge gas precooler. the

Further, the main water making air compressor is in communication with the hot side channel of the main water making device, and the connecting pipe between the main water making air compressor and the hot side channel of the main water making device is installed with a main water making device defrosting At the same time, there is a shut-off valve connected to the connecting pipe between the main water air compressor and the high-pressure air inlet of the membrane dehumidification component. the

Further, it also includes an air-assisted water-making device, the air-assisted water-making device includes an auxiliary water-making air-induced fan, an auxiliary water-air filter and an auxiliary water-making device, and the auxiliary water-making air-induced fan is in contact with the outside air. and the auxiliary water air induced draft fan, auxiliary water air filter, auxiliary water heater hot side channel and water tank are connected sequentially. The channel entrances are connected. the

Further, the main water-making air compressor communicates with the hot-side channel of the auxiliary water-making device, and the connecting pipe between the main water-making air compressor and the hot-side channel of the auxiliary water-making device is installed with an auxiliary water-making device for defrosting valve. the

A dehumidifying air cooler is also connected between the dehumidifying air precooler and the dehumidifying air expander, and the hot side channel of the dehumidifying air cooler is connected with the outlet of the hot side channel of the dehumidifying air precooler and the air inlet of the air expander respectively. The inlet of the cold side channel of the desiccant air cooler is connected with the outlet of the cold side channel of the auxiliary water heater. the

Further, the sweeping gas delivery pipe is connected to the high-pressure gas outlet of the membrane dehumidification module. the

According to the above technical scheme, the following beneficial effects can be achieved:

1. The dehumidification membrane is used to separate the water vapor in the air to achieve the purpose of enriching the water vapor in the air. Compared with the adsorption method, the working process is continuous, there is no corrosion problem, easy to maintain, and low energy consumption;

2. The open air refrigeration cycle is used to cool the air enriched with water vapor. There is no pollution problem of the working fluid, and it can work continuously for a long time. In addition, the compressor and expander are both centrifugal machines with high speed, so the unit volume and weight device with high water yield;

3. The air used to cool down in the main water generator still has a relatively low temperature, so an auxiliary water generator is installed to further recover the cooling capacity and improve the economical efficiency of the device operation. the

Description of drawings

Fig. 1 is the structural representation of water making device of the present invention;

Among them, 1 is the motor; 2 is the main water air filter; 3 is the main water air compressor; 4 is the stop valve; 5 is the membrane dehumidification component; 6 is the purge gas pressure reducing valve; Medium induced fan; 8 is dehumidification air precooler; 9 is dehumidification air cooler; 10 is dehumidification air expander; 11 is purge gas precooler; 12 is purge air cooling medium induced fan; 13 is main water 14 is the defrosting valve of the main water maker; 15 is the defrosting valve of the auxiliary water maker; 16 is the auxiliary water maker; 17 is the auxiliary water air filter; 18 is the auxiliary water air induced draft fan; 19 is Water pump; 20 is a water tank. the

Detailed ways

The accompanying drawings disclose a preferred embodiment of the present invention without limitation, and the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. the

The method for producing water utilizing a separation membrane to enrich air water vapor according to the present invention comprises the following steps: (1) air pretreatment adopts an air filter and a compressor to remove impurities and compress air; (2) air water For steam separation, the membrane dehumidification module 5 is used to dehumidify the compressed air treated in step (1) to obtain dehumidified air and water vapor on both sides of the membrane; Sweeping air is introduced into the water vapor permeation side of the membrane dehumidification module 5 in step (2), and the water vapor on the surface of the membrane wall is swept away to obtain high-humidity sweeping gas and realize the enrichment of air water vapor. The dehumidified air obtained in step (2) is used in an amount of 10-30% of the mass fraction of the dehumidified air; at the same time, the dehumidified air obtained in step (2) is removed from the purge gas, and the remaining part is sequentially cooled, After expansion, it is used as a water vapor cooling medium to condense the obtained high-humidity purge gas to obtain condensed water. In addition, after the water vapor cooling medium cools the high-humidity purge gas, it is used as a secondary cooling medium to condense the filtered air again. The auxiliary water and impurity-removing air of the cleaning device is cooled to obtain liquid or solid water; at the same time, the secondary cooling medium after cooling the auxiliary water and impurity-removing air is used as a compressed air cooling medium again, and the steps ( 3) cooling of compressed air; (4) condensed water collection If the condensed water treated in step (3) is liquid water, it is directly pumped into the water tank 20 through the water pump 19; After the water melts into liquid water, it is pumped into the water tank 20 through the water pump 19, and the thawing medium is compressed air pretreated in step (1). the

As shown in Figure 1, the water production device utilizing the separation membrane to enrich air water vapor according to the present invention includes an air main water production device, the air main water production device includes a main water production air pretreatment device, a membrane dehumidification assembly 5, Sweep gas pressure reducing valve 6, dehumidification air pre-cooler 8, dehumidification air expander 10, purge gas pre-cooler 11, main water generator 13 and water tank 20, the main water air pretreatment device includes sequential connection The main water-air filter 2 and the main water-air compressor 3, the air inlet of the main water-air filter 2 is connected to the outside air, and the high-pressure air inlet of the membrane dehumidification assembly 5 is connected to the The air outlet of the main water-making air compressor 3 is connected, while the high-pressure air outlet of the membrane dehumidification module 5, the hot side channel of the dehumidifying air precooler 8, the dehumidifying air expander 10, and the inlet of the cold side channel of the main water machine are connected in sequence Sequentially connected, at the same time, the outlet of the purge gas pressure reducing valve 6, the low-pressure inlet side of the membrane dehumidification module 5, the hot side channel of the purge gas precooler 11, the hot side channel of the main water generator, and the water tank 20 in sequence connected in sequence, and the air inlet of the purge gas pressure reducing valve 6 is communicated with the purge gas delivery pipe. In addition, the cold side channels of the dehumidified air precooler 8 and the purge gas precooler 11 all have cooling medium circulating, so The cold side passage inlets of the dehumidified air precooler 8 and the purge air precooler 11 are respectively connected to the air inlets of the dehumidified air cooling medium induced draft fan 7 and the purge air cooling medium induced draft fan 12 through pipes, and the dehumidified air precooling The outlets of the cold side channels of the device 8 and the purge gas precooler 11 are all communicated with the external environment. the

Since the condensed water obtained by the main water maker 13 may be solid water, it is necessary to melt the solid water before it can be diverted to the water tank 20, so the present invention combines the main water maker air compressor 3 with the main water maker 13 The hot side channel is connected, and the main water generator defrost valve 14 is installed on the connecting pipe between the main water generator air compressor 3 and the hot side channel of the main water generator 13, and the main water generator air compressor 3 and the membrane dehumidification A cut-off valve 4 is connected to the connection pipeline between the high-pressure air inlets of the assembly 5 . the

In order to further utilize the cooling source of the water vapor cooling medium drawn by the compressed air expander as the high-humidity purge gas in the hot side channel of the main water generator 13, the present invention also includes an air-assisted water production device, which includes Auxiliary water air induced fan 18, auxiliary water air filter 17 and auxiliary water device 16, said auxiliary water air induced fan 18 is connected with outside air, and auxiliary water air induced fan 18, auxiliary water The air filter 17 , the hot side channel of the auxiliary water generator 16 and the water tank 20 are sequentially connected, and at the same time, the outlet of the cold side channel of the main water generator 13 is connected with the inlet of the cold side channel of the auxiliary water generator 16 . Similarly, the condensation produced by the auxiliary water device 16 may also be solid water. Therefore, the present invention communicates the main water air compressor 3 with the hot side channel of the auxiliary water device 16, and the main water air compressor 3 A defrosting valve 16 of the auxiliary water device is installed on the connecting pipe with the hot side channel of the auxiliary water device 16 . the

Therefore, the hot side passage of the main water generator 13 has two inlets and two outlets, and the two inlets of the hot side passage of the main water generator 13 are respectively connected to the outlet of the hot side passage of the purge gas precooler 11 and the main water generator through pipelines. The outlet of the device defrosting valve 14 is connected, and the two outlets of the hot side channel of the main water generator 13 are connected with the atmosphere. Similarly, the hot side channel of the auxiliary water generator 16 also has two inlets and outlets. The two inlets of the hot side channel of the water heater 16 are respectively connected with the outlet of the air filter and the auxiliary water heater defrosting valve 16, while the two outlets thereof are directly connected with the atmospheric environment. the

In addition, a dehumidification air cooler 9 is also connected between the dehumidification air precooler 8 and the dehumidification air expander 10, and the hot side passages of the dehumidification air cooler 9 are connected with the hot side passages of the dehumidification air precooler 8 respectively. The air outlet is connected with the air inlet of the air expander, and the cold side channel inlet of the dehumidification air cooler 9 is connected with the cold side channel air outlet of the auxiliary water tank 16, and the cold side channel air outlet of the dehumidification air cooler 9 is Connected to the atmospheric environment, it can be seen that the water vapor cooling medium output by the compressed air expander has been more thoroughly utilized, which greatly saves energy and water production costs. the

The purge gas in the present invention is directly derived from the dehumidified air output from the high-pressure air outlet of the membrane dehumidification module 5 , therefore, the present invention connects the purge gas delivery pipe to the high-pressure air outlet of the membrane dehumidification module 5 . the

In detail, the connection relationship between the components described in accompanying drawing 1 is as follows:

The air inlet of the main water-air filter 2 is directly connected to the atmospheric environment, and the air outlet of the main water-air filter 2 is connected to the air inlet of the main water-air compressor 3 through a pipeline. The air outlet of the compressor 3 is respectively connected to the inlets of the shut-off valve 4, the defrosting valve 14 of the main water generator and the defrosting valve 16 of the auxiliary water generator through pipelines, and the outlet of the shut-off valve 4 is connected to the high-pressure air intake of the membrane dehumidification module 5 through pipelines. The high-pressure air outlet of the membrane dehumidification module 5 is respectively connected to the air inlet of the pressure reducing valve and the air inlet of the hot side channel of the dehumidification air precooler 8 through pipelines, and the low-pressure air inlet and the low-pressure air outlet of the membrane dehumidification module 5 are respectively Connect the air outlet of the pressure reducing valve and the air inlet of the hot side channel of the purge gas precooler 11 through the pipeline, and the air inlet and the air outlet of the cold side channel of the purge air precooler 11 are respectively connected with the purge air cooling medium through the pipeline The air inlet of the induced draft fan 12 is connected to the atmospheric environment, while the air inlet of the induced draft fan 12 for the purge air cooling medium is directly connected to the atmospheric environment, and the air outlet of the hot side channel of the dehumidified air pre-cooler 8 is connected to the hot side of the dehumidified air cooler 9 The air inlet of the channel is connected, and the air inlet and outlet of the cold side channel of the dehumidified air precooler 8 are respectively connected with the air inlet of the dehumidified air cooling medium induced fan 7 and the atmospheric environment, and the air inlet of the dehumidified air cooled medium induced fan 7 It is directly connected with the atmospheric environment, the air inlet of the dehumidifying air cooler 9 is connected to the outlet of the cold side channel of the auxiliary water cooler 16 through pipes, the air outlet of the dehumidifying air cooler 9 is directly connected with the atmospheric environment, and the dehumidifying air is cooled The air outlet of the hot side channel of the device 9 is connected to the air inlet of the dehumidifying air expander 10 through a pipeline, and the air outlet of the dehumidifying air expander 10 is connected to the air inlet of the cold side channel of the main water generator 13 through a pipeline, and the cold side of the main water generator 13 The air outlet of the channel is connected to the air inlet of the cold side channel of the auxiliary water device 16 through a pipe, the air outlet of the cold side channel of the auxiliary water device 16 is connected to the air inlet of the cold side channel of the dehumidification air cooler 9 through a pipe, and the cooling of the expander cooler The air outlet of the side channel is directly connected with the atmospheric environment. The hot side channel of the main water generator 13 has two air inlets and an air outlet. The air outlet of the hot side passage of the precooler 11 is connected with the air outlet of the defrosting valve 14 of the main water generator, and its two air outlets are connected with the atmospheric environment, and the hot side passage of the auxiliary water generator 16 also has two air inlets and outlets. Air port, the air inlet of the hot side channel of the auxiliary water heater 16 is respectively connected to the air outlet of the auxiliary water air filter 17 and the defrosting valve 16 of the auxiliary water heater, and its two outlets are also directly connected to the atmospheric environment. The inlet of the auxiliary water air filter 17 is connected with the air inlet of the auxiliary water air induced draft fan 18 through a pipeline, and the entrance of the auxiliary water air induced draft fan 18 is communicated with the atmospheric environment; the purge air precooler 11, Both the hot side of the main water generator 13 and the auxiliary water generator 16 are provided with water outlets, these outlets are connected to the inlet of the water pump 19 through water pipes, and the outlet of the water pump 19 is connected to the inlet of the water tank 20 through water pipes. the

The above-mentioned main water-air compressor 3 and the dehumidifying air expander 10 are centrifugal machines; the above-mentioned main water-air compressor 3 and the dehumidifying air expander 10 are respectively coaxially connected with the electric motor 1 or are connected to each other through devices such as belts and gears. connect;

The power source of the above-mentioned motor 1 is grid alternating current, vehicle direct current, storage battery, wind power generation device, solar power generation device;

The above-mentioned membrane dehumidification module 5 is a hollow fiber type, flat type or roll type structure;

The above purge gas precooler 11, dehumidification air precooler 8, dehumidification air cooler 9, main water generator 13 and auxiliary water generator 16 are plate-fin heat exchangers; the above purge gas precooler 11, The dehumidifying air precooler 8, the dehumidifying air cooler 9, the main water generator 13 and the auxiliary water generator 16 can also be shell and tube heat exchangers with threads inside and outside the heat exchange tubes

The working process of this embodiment is as follows:

When the water-making device of the present invention needs to make water from the air, the main water-making air compressor 3 inhales the main water-making air with a certain humidity in the atmospheric environment and increases its pressure through compression. The air inlet enters the high-pressure side. Under the action of membrane separation, part of the water vapor in the main water-air permeates into the low-pressure side of the membrane dehumidification module 5, and the dehumidified air after reducing the humidity of the main water-air passes through the high-pressure outlet of the membrane dehumidification module 5. The air port is discharged, and most of the dehumidified air passes through the hot side channel of the dehumidified air precooler 8 and the dehumidified air cooler 9 to cool down in turn, and then enters the suction port of the dehumidified air expander 10, and a small part of the dehumidified air is decompressed by the dehumidifying valve. Finally, as sweeping gas, it enters the low-pressure side through the low-pressure air inlet of the membrane dehumidification module 5, and the water vapor permeated through the membrane is swept away from the surface of the membrane wall. Sweeping air, the high-humidity sweeping gas is then discharged through the low-pressure air outlet of the membrane dehumidification module 5, then passes through the sweeping gas precooler 11 and the hot side channel of the main water generator 13 in turn, and is cooled in the cold side channel of the main water generator 13 Under the action of the medium, the water vapor in the purge gas is precipitated as liquid water or adheres to the wall of the hot side channel in the form of frost or ice, and the cooling medium circulating in the cold side channel of the main water generator 13 is supplied by the dehumidification air expander 10 outputs. the

In addition, after being processed by the dehumidifying air expander 10, the dehumidifying air expands and lowers its temperature, and then flows out through the exhaust port of the dehumidifying air expander 10, and first passes through the cold side channel of the main water generator 13 as a cooling medium of water vapor, and then the temperature has a certain Then, as the secondary cooling medium, it flows into the cold side channel of the auxiliary water device 16, and the temperature of the auxiliary water air from the atmospheric environment in the hot side channel of the auxiliary water device 16 is reduced, thereby reducing the temperature of the auxiliary water air contained in the auxiliary water device. Water vapor precipitates as liquid water or adheres to the wall surface of the hot side channel in the form of frost or ice, and finally enters the cold side channel of the dehumidification air cooler 9 again as a compressed air cooling medium to cool the hot side channel of the dehumidification air cooler 9 The dehumidified air is cooled, so it can be seen that the recycling of the cold source of the present invention effectively reduces the cost of water production;

When the frost layer or ice layer on the hot side channel wall of the main water generator 13 or the auxiliary water generator 16 reaches a certain thickness, the defrosting process is entered at this time, the stop valve 4 is closed and the main water generator defrosting valve 14 or the auxiliary water generator is opened correspondingly. The defrosting valve 16 of the water generator makes the high-temperature exhaust gas produced by the main water generator 3 directly enter the hot side channel of the main water generator 13 or the auxiliary water generator 16 to melt the frost or ice into liquid water. Or after the ice layer is completely melted, open the shut-off valve 4 and close the defrost valve 14 of the main water generator or the defrost valve 16 of the auxiliary water generator accordingly, and enter the water production process again;

In the water production process or the defrosting process, the liquid water produced in the purge gas precooler 11, the main water generator 13 and the auxiliary water generator 16 is pumped into the water tank 20 by the water pump 19; the water in the water tank 20 is filtered through appropriate , sterilization and other purification steps, it can be provided to people for use. the

Claims (10)

1. a process for preparing water that utilizes diffusion barrier enriched air By steam is characterized in that, may further comprise the steps:

(1) air preliminary treatment---adopt air filter, compressor that air is carried out removal of impurities, compression;

(2) separating treatment of air vapor---adopt film dehumidifying assembly that the compressed air of handling through step (1) is carried out dehumidification treatments to obtain to be in respectively the dehumidified air and the steam of film both sides;

(3) condensed water cohesion---a, adopt the sweep gas method that sweep gas is introduced the vapor permeation side of film dehumidifying assembly in the step (2), carry out the lip-deep steam cleaning of membranous wall,, realize the enrichment of air vapor to obtain the high humility sweep gas; B, dehumidified air that step (2) is obtained successively through supercooling, expand after as the steam cooling medium; C, the steam cooling medium among the step b is carried out condensation to the high humility sweep gas that is obtained among the step a, obtain condensed water;

(4) condensed water is collected---the condensed water after step (3) is handled, if aqueous water directly pumps into water tank through water pump; If solid water adopts the medium that thaws that condensed water is melted to behind the aqueous water earlier, pump into water tank through water pump again.

2. according to the said process for preparing water that utilizes diffusion barrier enriched air By steam of claim 1, it is characterized in that used sweep gas derives from dehumidified air in the step (3), the mass fraction that its use amount accounts for dehumidified air is 10～30%.

3. according to the said process for preparing water that utilizes diffusion barrier enriched air By steam of claim 1, it is characterized in that the medium that thaws in the step (4) is the pretreated compressed air of process step (1).

4. according to the said process for preparing water that utilizes diffusion barrier enriched air By steam of claim 3; It is characterized in that; In step (3), after the steam cooling medium cools off the high humility sweep gas, as the secondary cooling medium; Once more the auxilliary system water removal of impurities air of handling through the air filter removal of impurities is cooled off, to obtain liquid or solid water; Simultaneously, auxilliary system water removal of impurities air is carried out cooled secondary cooling medium,, carry out the cooling of dehumidified air in the step (3) once more as the compressed air cooling medium.

5. water generator that utilizes diffusion barrier enriched air By steam; It is characterized in that; Comprise air master water generator; This air master water generator comprises main system water air pretreatment unit, film dehumidifying assembly, sweep gas pressure-reducing valve, dehumidified air forecooler, dehumidified air decompressor, sweep gas forecooler, main water-producing apparatus and water tank; Said main system water air pretreatment unit comprises the main system water air filter and main system water air compressor that is linked in sequence, and the air inlet and the outside air of said main system water air filter are connected, and the high pressure admission mouth of said film dehumidifying assembly is connected with the gas outlet of main system water air compressor; The cold side channel entrance of the high pressure gas outlet of film dehumidifying assembly, hot-side channel, dehumidified air decompressor and the main water-producing apparatus of dehumidified air forecooler then is linked in sequence successively; Simultaneously, the hot-side channel and the water tank of the gas outlet of sweep gas pressure-reducing valve, the low-pressure admission side of film dehumidifying assembly, the hot-side channel of sweep gas forecooler, main water-producing apparatus are linked in sequence successively, and the air inlet of sweep gas pressure-reducing valve is communicated with the sweep gas carrier pipe; In addition, the cold side passage of dehumidified air forecooler and sweep gas forecooler all has the cooling medium circulation.

6. according to the said water generator that utilizes diffusion barrier enriched air By steam of claim 5; It is characterized in that; Said main system water air compressor is communicated with main water-producing apparatus hot-side channel; And being connected between main system water air compressor and the main water-producing apparatus hot-side channel is equipped with main water-producing apparatus defrost valve on the pipeline, and main simultaneously system water air compressor and film dehumidify and being connected between the high pressure admission mouth of assembly be connected with stop valve on the pipeline.

7. according to claim 5 or the 6 said water generators that utilize diffusion barrier enriched air By steam; It is characterized in that; Comprise that also air assists water generator; The auxilliary water generator of this air comprises auxilliary system water air air-introduced machine, auxilliary system water air filter and auxilliary water-producing apparatus, and said auxilliary system water air air-introduced machine and outside air are connected, and auxilliary system water air air-introduced machine, auxilliary system water air filter, auxilliary water-producing apparatus hot-side channel and water tank are linked in sequence successively; Simultaneously, the cold side channel outlet of main water-producing apparatus is connected with the cold side feeder connection of auxilliary water-producing apparatus.

8. according to the said water generator that utilizes diffusion barrier enriched air By steam of claim 7; It is characterized in that; Said auxilliary water-producing apparatus hot-side channel is communicated with main system water air compressor, and auxilliary water-producing apparatus hot-side channel is equipped with auxilliary water-producing apparatus defrost valve being connected between the water air compressor with main the system on the pipeline.

9. according to the said water generator that utilizes diffusion barrier enriched air By steam of claim 7; It is characterized in that; Also be connected with the dehumidified air cooler between said dehumidified air forecooler and the dehumidified air decompressor; The hot-side channel of said dehumidified air cooler is connected with the hot-side channel outlet and the air expander air inlet of dehumidified air forecooler respectively, and the cold side channel entrance of dehumidified air cooler then is connected with the cold side channel outlet of auxilliary water-producing apparatus.

10. according to the said water generator that utilizes diffusion barrier enriched air By steam of claim 5, it is characterized in that said sweep gas carrier pipe is connected with the high pressure gas outlet of film dehumidifying assembly.

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