Device and method for obtaining water from air on island

Patent metadata

Field	Value
Publication number	US-11339556-B2
Application number	US-201716489224-A
Country	US
Kind code	B2
Filing date	Nov 23, 2017
Priority date	Mar 3, 2017
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

A device for obtaining water from air on an island includes: a concentrated solution air water obtaining system, a solar collector, a dilute solution dehydration system, a heat pump system, a solution heating system, and a water purification system. Humid air is introduced into the concentrated solution air water obtaining system, which performs a heat and mass transfer into a dilute solution and relatively low-temperature dry air. This air is used as interior fresh air. The diluted solution is heated by the solar collector, delivered to the dilute solution dehydration system, and sent to the solution heating system for heating and evaporating into water vapor. The water purification system cools, purifies, filters and stores the water vapor. At the same time, the heat pump system introduces heated humid air into the dilute solution dehydration system to recover heat contained in the heated humid air, and to extract water.

First claim

What is claimed is:

1. A device for obtaining water from air on an island, comprising:
a concentrated solution air water obtaining system,
a solar collector,
a dilute solution dehydration system,
a heat pump system,
a solution heating system, and
a water purification system, wherein:
humid air on the island is introduced into the concentrated solution air water obtaining system, and the concentrated solution air water obtaining system performs a heat and mass transfer to turn the humid air into a dilute solution and relatively low-temperature dry air; the relatively low-temperature dry air is sent into the interior of an island building as interior fresh air, and the diluted solution is sent to the solar collector to be heated and delivered to the dilute solution dehydration system; the dilute solution dehydration system sends the dilute solution to the solution heating system for heating; then the dilute solution is sent back to the dilute solution dehydration system for dehydration to evaporate water in the dilute solution, and a water vapor accompanied with air is sent to the water purification system; the water purification system cools, purifies, filters and stores the water vapor;
the concentrated solution air water obtaining system comprises a moisture absorber and a moisture absorption liquid tank; a liquid outlet of the moisture absorber is connected with the moisture absorption liquid tank, and an air outlet of the moisture absorber is connected with the interior of the island building; a first liquid outlet of the moisture absorption liquid tank is connected with the dilute solution dehydration system through the solar collector, and a second liquid outlet of the moisture absorption liquid tank is connected with the dilute solution dehydration system;
the dilute solution dehydration system comprises a regeneration liquid tank, a vapor-water separation tank and a first check valve; a first liquid inlet of the regeneration liquid tank is connected with the second liquid outlet of the moisture absorption liquid tank, a second liquid inlet of the regeneration liquid tank is connected with the solar collector, and a liquid outlet of the regeneration liquid tank is connected with a liquid inlet of the vapor-water separation tank through the solution heating system and the first check valve; an output line of the regeneration liquid tank is subjected to secondary heating of the solution heating system, thereby accelerating evaporation of the dilute solution in the vapor-water separation tank;
the concentration of the solution at the bottom of the moisture absorption liquid tank is higher than the concentration of the solution at the upper part of the moisture absorption liquid tank after a heat and mass transfer with a saline solution in the moisture absorber; the solution of the moisture absorber is extracted from the bottom of the moisture absorption liquid tank to the upper part of the moisture absorber to be further subjected to a heat and mass transfer with the humid air of the island;
the moisture absorber is provided with a spray tower apparatus, which realizes an efficient heat and mass transfer between the low-temperature concentrated solution and the humid air of the island;
at the same time, the heat pump system introduces heated humid air of the island into the dilute solution dehydration system, in which the heated humid air is subjected to a heat and mass transfer with the dilute solution to recover heat contained in the heated humid air, and extract water contained in the heated humid air; an evaporator in the heat pump system lowers the temperature of the concentrated solution that enters the moisture absorber, which, on the one hand, more facilitates the absorption of the water and a salt spray from the air during the heat and mass transfer between the low-temperature concentrated solution and the humid air of the island, and on the other hand, lowers the temperature of the air, and obtains low-temperature dry air that can meet the requirements of a human settlement environment or a material storage room for the temperature and humidity of the air.

2. The device for obtaining water from air on an island according to claim 1 , wherein the heat pump system comprises an air cooler, a compressor, an electronic expansion valve and an evaporator; the air cooler, the electronic expansion valve, the evaporator and the compressor are sequentially connected to form a circulation loop; a heated air outlet line of the air cooler is connected with the vapor-water separation tank; a solution outlet of the evaporator is connected to the moisture absorber.

3. The device for obtaining water from air on an island according to claim 2 , wherein a first two-way valve is disposed between the moisture absorption liquid tank and the evaporator, and a second check valve is disposed between a cold air outlet of the evaporator and the moisture absorber; the moisture absorption liquid tank, the first two-way valve, the evaporator, the second check valve and the moisture absorber are sequentially connected to form a loop.

4. The device for obtaining water from air on an island according to claim 2 , wherein the solution heating system comprises a heat exchanger, a water heater, and a hot water circulation tank; the heat exchanger, the hot water circulation tank and the water heater are sequentially connected to form a circulation loop; the liquid outlet of the regeneration liquid tank is connected to the first check valve through the heat exchanger.

5. The device for obtaining water from air on an island according to claim 1 , wherein the water purification system comprises a distilled water separator, a purification filter and a fresh water tank; an inlet of the distilled water separator is connected to a vapor-water outlet of the vapor-water separation tank, and a water outlet of the distilled water separator, the purification filter and the fresh water tank are sequentially connected.

6. The device for obtaining water from air on an island according to claim 4 , wherein a second two-way valve is disposed between the liquid outlet of the regeneration liquid tank and the heat exchanger.

7. A method for obtaining water for the device for obtaining water from air on an island according to claim 1 , comprising the following steps:
introducing humid air on the island into a concentrated solution air water obtaining system, and performing, by the concentrated solution air water obtaining system, a heat and mass transfer to turn the humid air into a dilute solution and relatively low-temperature dry air, wherein the relatively low-temperature dry air is sent into the interior of an island building as interior fresh air;
sending the diluted solution to a solar collector to be heated and delivered to a dilute solution dehydration system;
sending, by the dilute solution dehydration system, the dilute solution to a solution heating system for heating, and then sending the dilute solution back to the dilute solution dehydration system;
spraying, by the dilute solution dehydration system, to evaporate water in the dilute solution, and inputting a water vapor accompanied with air to a water purification system; at the same time, introducing, by a heat pump system, heated humid air of the island into the dilute solution dehydration system, in which the heated humid air is subjected to a heat and mass transfer with the dilute solution to recover heat contained in the heated humid air, and extract water contained in the heated humid air; and
cooling, purifying, filtering and storing, by the water purification system, the water vapor.

8. The method for obtaining water for the device for obtaining water from air on an island according to claim 7 , further comprising: outputting

Assignees

• Univ Dongguan Technology

Inventors

• Guo Xiaojuan
• Xu Yongjun

Classifications

• Y02A20/00

  Water conservation; Efficient water supply; Efficient water use · CPC title

• C02F1/001

  Processes for the treatment of water whereby the filtration technique is of importance (C02F1/44 takes precedence; construction of filters in general B01D24/00 - B01D41/00) · CPC title

• E03B3/28 Primary

  from humid air (condensing of vapours in general B01D5/00; dehumidification of air for air-conditioning F24F3/14) · CPC title

• C02F1/04

  by distillation or evaporation · CPC title

• B01D5/006

  with evaporation or distillation · CPC title