CN109987662A - A kind of humidification that solar energy is coupled with LNG removes wet process sea water desalination process - Google Patents
A kind of humidification that solar energy is coupled with LNG removes wet process sea water desalination process Download PDFInfo
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- CN109987662A CN109987662A CN201910389438.6A CN201910389438A CN109987662A CN 109987662 A CN109987662 A CN 109987662A CN 201910389438 A CN201910389438 A CN 201910389438A CN 109987662 A CN109987662 A CN 109987662A
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- 239000013535 sea water Substances 0.000 title claims abstract description 108
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000008569 process Effects 0.000 title claims abstract description 19
- 238000001704 evaporation Methods 0.000 claims abstract description 42
- 230000008020 evaporation Effects 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 44
- 238000007791 dehumidification Methods 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 23
- 239000003345 natural gas Substances 0.000 claims description 23
- 239000002918 waste heat Substances 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 229920000728 polyester Polymers 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims 1
- 238000012546 transfer Methods 0.000 abstract description 14
- 238000009833 condensation Methods 0.000 abstract description 13
- 230000005494 condensation Effects 0.000 abstract description 13
- 238000004821 distillation Methods 0.000 abstract description 10
- 239000007789 gas Substances 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000002950 deficient Effects 0.000 abstract description 2
- 230000008676 import Effects 0.000 abstract 1
- 239000013505 freshwater Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- 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
- Y02A20/124—Water desalination
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- 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
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/142—Solar thermal; Photovoltaics
-
- 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
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention patent relates to the humidifications that a kind of solar energy is coupled with LNG to remove wet process sea water desalination process, wet process sea water desalination is gone in conjunction with solar distilling and humidification, using solar energy as high-temperature heating heat source, LNG is as condensation low-temperature heat source, the condensation for accelerating Hot wet air heating and vapor is dried, the hot-air using solar thermal collector heating is sent into solar energy vaporising device simultaneously, accelerate convective heat transfer mass transfer, subnormal ambient reduces evaporation of seawater temperature, solves the problems, such as conventional solar distilling method sea-water-desalination water producing rate and inefficient.Using a concentrated seawater of solar energy distillation device output as the import seawater of humidifier, reduce the device of heating seawater, corrosion and scaling problem when wet process sea water desalination heating seawater is gone so as to avoid tradition humidification.The invention patent further relate to disclose it is a kind of fresh seawater is heated with neat gas burner, solve under bad weather that solar energy is deficient, replace solar energy air heat collector using the UTILIZATION OF VESIDUAL HEAT IN heat exchange equipment of burner tail flue gas.
Description
Technical Field
The invention relates to a seawater desalination process by a humidification dehumidification method with solar energy and LNG coupled in the field of seawater desalination, in particular to a natural gas burner and a flue gas waste heat utilization device which are designed to keep a system capable of continuously running while improving the efficiency by a desalination method combining solar heat energy and LNG cold energy coupling and a humidification dehumidification method with a negative pressure distillation method.
Background
The sea water desalination by the solar distillation method has a long history, various novel solar distillation systems emerge endlessly, and a plurality of devices can be economically comparable to the traditional sea water desalination devices, and most of the devices directly heat and evaporate the sea water by using collected solar heat energy, or generate electricity by using solar energy and then drive reverse osmosis by using electric energy to prepare fresh water.
A seawater desalination technology by humidifying and dehumidifying method features that the flowing air is used as carrier of water vapour, the air is heated to become hot air, the moisture content is increased, the seawater evaporated in humidifier is humidified to become hot and humid air, and the fresh water is obtained by condensing and dehumidifying, and the latent heat of condensation is recovered by preheating seawater. The humidification and dehumidification method for seawater desalination has the advantages of flexible scale, moderate equipment investment and operation cost, utilization of low-grade heat energy and the like.
With the introduction of the policy of energy conservation and emission reduction, natural gas is highly regarded by the national level as a clean fossil energy, so that the natural gas has a good development prospect. Because natural gas is gas at normal temperature and normal pressure and is inconvenient to transport, the natural gas is usually converted into LNG with the temperature of about 111K, the LNG needs to be gasified and converted into gas when being transported to a user, a large amount of cold energy is released in the process, and the part of cold energy is generally wasted, so that the waste of energy can be reduced by utilizing the LNG cold energy, and the method has great practical significance.
The two seawater desalination methods have advantages and disadvantages, and although the seawater desalination method by the solar distillation method has mature technology, simple structure and clean energy utilization, the seawater desalination method has low water yield, low water production rate, high equipment investment of unit water yield and easy influence of environmental weather, and the latent heat of condensation is not fully utilized. The most important heat exchange mode of natural convection greatly limits the performance of the evaporator, and the water production efficiency and the water production rate of the evaporator are limited by low operating temperature, low mass and heat transfer capacity and large evaporation heat capacity of seawater at normal pressure.
The principle of the seawater desalination method by the humidification and dehumidification method is simple, but the traditional humidification and dehumidification method utilizes a solar heat collector, the operation life of equipment is reduced due to the corrosivity and scaling of seawater, and the temperature and humidity of hot air have obvious influence on the desalination efficiency and the desalination rate of the whole device.
Disclosure of Invention
In order to overcome the defects of the distillation seawater desalination process and the humidification dehumidification seawater desalination process in the prior art, the invention provides a humidification dehumidification seawater desalination process with coupling of solar energy and LNG.
In order to achieve the purpose, the invention provides the following technical scheme:
a solar energy and LNG coupled humidification dehumidification method seawater desalination process is composed of a solar energy distillation seawater desalination process and a humidification dehumidification method seawater desalination process which are connected in series and in parallel.
The parallel connection part comprises a process of generating steam by the solar evaporation device and a process of generating hot humid air by the humidification device.
The process of producing steam by seawater desalination by the solar distillation method comprises the steps of conveying fresh seawater preheated by secondary concentrated seawater to a solar evaporation device through a liquid-liquid heat exchanger, enabling part of hot air heated by an air heat collector to enter the solar evaporation device for heat and humidity exchange, converging the hot air with steam, and leading out the hot air from the evaporation device.
The liquid-liquid heat exchanger utilizes secondary concentrated seawater with higher salt concentration from the humidifying device to exchange heat with fresh seawater, so as to preheat seawater and reduce the heat load of the solar seawater evaporation device.
The humidifying device generates hot and humid air, primary concentrated seawater which is low in salt content and comes out from the solar evaporation device enters the humidifying device, is finely dispersed into small liquid drops through the sprayer and uniformly laid in the porous polyester sponge, hot air heated by the air heat collector is fed from the lower part of the humidifying collection box, is subjected to sufficient heat and humidity exchange with the primary concentrated seawater in the sponge, and is led out from the upper part through the Roots blower.
The series connection part comprises a solar evaporation device, a humidifying device and a condenser, wherein the solar evaporation device generates steam, the humidifying device generates hot and humid air, the hot and humid air is converged with a condensation dehumidification process and an air reheating process after dehumidification is carried out, the hot and humid air and water vapor are converged, then the hot and humid air and LNG exchange heat through a gas-liquid heat exchanger, the condensation cooling dehumidification is carried out, obtained fresh water and natural gas are conveyed to a user through a pipeline, and obtained dry and cold air enters an air heat collector to be heated and enters the next cycle.
The natural gas burner device is characterized in that when the weather is bad and the sunlight irradiation is insufficient, the three-way valve is adjusted to open a channel entering the burner, the channel entering the evaporation device is closed, the natural gas burner is started to raise the temperature of preheated fresh seawater, the fresh seawater is conveyed to a seawater heat absorption pipeline in a negative pressure environment to be directly evaporated, the effect of flash evaporation is achieved, the preheating heat exchanger utilizing tail smoke replaces an air heat collector to heat dry and cold air, one part of the dry and cold air is sent into the evaporation device, and the other part of the dry and cold air is sent into the humidification device.
The LNG gas-liquid heat exchanger, wherein flowing LNG is subjected to pressure reduction treatment, and the temperature of the controller is above zero, so that the problem that the gasification temperature is too low and icing occurs in the condensation and dehumidification process is prevented.
Has the advantages that:
in the process of seawater desalination by a solar distillation method, hot air with lower humidity is blown in to accelerate the mass and heat transfer process in the evaporation device and enhance the convection heat transfer, and the flow regulation of the Roots blowers at the inlet and the outlet can enable the seawater evaporation pipeline to be in a negative pressure state, thereby reducing the evaporation temperature of seawater and improving the evaporation rate of seawater. The primary concentrated seawater and the hot air are used for heat-moisture exchange, so that the water yield is increased, part of heat loss is reduced, and the seawater corrosion problem in the traditional seawater humidifying and dehumidifying device is solved because the seawater heating device is completed in the solar distillation device. Relevant experiments prove that the lower the condensation temperature, the higher the desalination efficiency and the higher the desalination rate, and the LNG and the fresh water are used as living necessities of users, so that the combination of the LNG and the fresh water realizes dehumidification and condensation, the gasification of the LNG and the improvement of the water production rate. The device adopted in the process can be used for small-scale production and large-scale production, and under the same investment condition, the seawater desalination process disclosed by the invention can greatly improve the water production rate and the water production efficiency while realizing energy conservation.
Drawings
FIG. 1 is a seawater desalination process by solar energy and LNG coupled humidification and dehumidification method
FIG. 2 is a seawater desalination process of the invention when solar energy is sufficient
FIG. 3 is a seawater desalination process during the lack of solar energy
Description of the details and reference numerals in the drawings accompanying the description:
10-solar energy evaporation plant 18-flue gas waste heat heating air device 61-63-three-way valve
11-light-gathering heat collector 19-user or collection station 71-primary concentrated seawater
12-seawater heat absorption evaporation pipeline 21-Roots blower 72-fresh water
13-humidifying device 22-23-common fan
14-liquid heat exchanger 32-sprayer
15-gas-liquid heat exchanger 33-porous polyester sponge
16-natural gas burner 41-45-one-way valve
17-air heat collector 51-53-water pump
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The invention discloses a seawater desalination process by a humidification and dehumidification method with solar energy and LNG coupled, which comprises a solar evaporation device, a light-gathering heat collector, a seawater heat absorption and evaporation pipeline, a humidification device, a heat exchanger, an air heat collector, a natural gas burner, a Roots blower of a user or a collection station and a water pump. Two adjacent devices are connected through a pipeline, a draught fan and a water pump to form a flow loop. The solar evaporation device is connected with the seawater preheating pipeline and the hot air pipeline, the primary concentrated seawater outlet is connected with the humidifier, and the humid air is converged with the steam outlet and the hot humid air outlet of the humidifier and enters the gas-liquid heat exchanger for condensation and dehumidification. The inlet of the air heat collector is connected with the dry and cold air outlet of the gas-liquid heat exchanger, the outlet of the air heat collector passes through the three-way valve, one side of the air heat collector enters the solar evaporator, and the other side of the air heat collector enters the humidifier for heat and moisture exchange. The natural gas burner is characterized in that the three-way valve is adjusted to be opened and closed under the condition of bad weather, preheated fresh seawater is further heated, an outlet of a seawater heat exchanger inside the natural gas burner is connected with a solar seawater desalination device, high-temperature seawater enters a seawater evaporation pipeline in a negative pressure state to be directly evaporated, the tail flue gas waste heat of the burner is used for replacing a solar air heat collector to heat dry and cold air from a gas-liquid heat exchanger, and hot air enters the next circulation. And the user or the collecting station uses or collects the obtained natural gas and fresh water. The connection relationship between the devices of the present invention is familiar to those skilled in the art, and will not be described herein.
The process for desalinating seawater comprises the following steps:
(1) the seawater is pretreated and then enters a liquid-liquid heat exchanger to exchange heat with secondary concentrated seawater, the concentrated seawater after heat exchange is directly discharged or sent to a salt plant, preheated fresh seawater is sent to a solar evaporation device through a water pump, and the flow rate is controlled not to be too large so that the seawater can be evaporated to the maximum extent;
(2) dry and cold air generated after passing through the gas-liquid heat exchanger enters the air heat collector through the Roots blower, hot air heated by solar energy passes through the Roots blower and the three-way valve, one end of the hot air enters the solar evaporator, and the other end of the hot air enters the humidifier;
(3) in the solar seawater evaporator, the collected hot air and preheated seawater are subjected to heat-moisture exchange, meanwhile, the sunlight condensing heater heats and evaporates the seawater again, and the mixed gas of water vapor and the hot-moisture air is discharged in time through the gas collector and the Roots blower, so that the humidity in an evaporation pipeline is reduced;
(4) when the solar seawater desalination device is started, the flow of the steam and hot humid air outlet is just started to be slightly larger than the flow of the hot air inlet, so that the pipeline is in a negative pressure state, then the flow of the Roots blowers at the inlet and the outlet is kept the same, and the constant negative pressure is maintained;
(5) the concentrated seawater in the solar evaporator is led out from the lower part, is sent into the humidifier through a water pump, is atomized and evaporated through the atomizer, small liquid drops are uniformly and finely dispersed on the porous medium sponge, hot air is sent from the lower part of the sponge through the air heat collector, is changed into hot and humid air through convective mass transfer and heat transfer, carries a part of water vapor and is mixed with the water vapor and the hot and humid air of the solar evaporator through a draught fan;
(6) the mixed water vapor and hot humid air enter a gas-liquid heat exchanger, are changed into dry and cold air after condensation and dehumidification, enter an air heat collector, and are subjected to next circulation, and the obtained fresh water and a natural device are sent to a user or a collection station for storage;
(7) in severe weather, solar energy resources are seriously insufficient, in order to keep the continuous production of fresh water, the preheated seawater enters the combustor to be heated by adjusting a three-way valve connected with the natural gas combustor, and is sent into a solar evaporation device through a water pump at an outlet, so that the seawater is directly evaporated in a negative pressure environment, the heat load of solar heat collection is reduced, meanwhile, the dry and cold air is heated by utilizing the waste heat of tail flue gas to replace an air heat collector, and the rest circulation is the same as the steps (1) - (6).
Example (b):
fig. 2 shows a seawater desalination process under the condition of sufficient solar energy resources, firstly, fresh seawater enters a liquid-liquid heat exchanger 14 through a one-way valve 43 after being pretreated, and exchanges heat with secondary concentrated seawater from a humidifier 13, and the concentrated seawater after heat exchange is discharged through a one-way valve 44; the preheated seawater enters a seawater evaporation pipeline 12 in a seawater evaporation device through a water pump 52, mass transfer and heat transfer are carried out on the preheated seawater and hot air from a solar air heat collector 17 in the pipeline 12, and the obtained hot humid air and water vapor mixed gas is led out through a Roots induced draft fan 21; the primary concentrated seawater obtained after evaporation in the solar seawater evaporation pipeline is introduced into the humidifier under the action of gravity through the one-way valve 41, is finely dispersed into small droplets or water vapor through the atomizer 13, the small droplets are uniformly dispersed on the porous medium sponge 33, the hot air from the solar air heat collector 17 is introduced from the lower part of the humidifier 13, is converted into hot and humid air after carrying the water vapor through convective mass transfer, is led out from the upper part of the humidifier 13, is converged with the hot and humid air and the water vapor from the solar heat collector, and is conveyed to the gas-liquid heat exchanger 15 through a pipeline, the fresh water and the natural gas obtained after condensation and dehumidification are conveyed to a user or a collection station 19, the dry and cold air from the gas-liquid heat exchanger 15 enters the solar air heat collector 17 through a common induced draft fan 22, the heated air conveys 20 percent of the hot air to the solar air heat collector 10 through a regulating three-way, 80% of the hot air is delivered to the humidifier 13 for the next cycle.
Fig. 3 shows a seawater desalination process under the condition of extremely deficient solar energy in severe weather, firstly, fresh seawater is pretreated and then enters a liquid-liquid heat exchanger 14 through a one-way valve 43 to exchange heat with secondary concentrated seawater from a humidifier 13, and the concentrated seawater after heat exchange is discharged through a one-way valve 44; the preheated seawater enters the natural gas combustor 16 through the water pump 52 to be heated, the obtained high-temperature seawater enters the seawater evaporation pipeline 12 through the water pump 53, mass transfer and heat transfer are carried out in the pipeline 12 with hot air from the combustor tail flue gas waste heat utilization air heating device 18, and the obtained hot wet air and water vapor mixed gas is led out through the Roots induced draft fan 21; the primary concentrated seawater obtained after evaporation in the solar seawater evaporation pipeline is introduced into the humidifier through the action of gravity through the one-way valve 41, is finely dispersed into small droplets or water vapor through the atomizer 13, the small droplets are uniformly dispersed on the porous medium sponge 33, hot air from the burner tail flue gas waste heat utilization air heating device 18 is introduced from the lower part of the humidifier 13, and is subjected to heat transfer through convection mass transfer, the hot air carrying the water vapor is changed into hot humid air which is led out from the upper part of the humidifier 13, is converged with the hot humid air and the water vapor from the solar heat collector and is conveyed to the gas-liquid heat exchanger 15 through a pipeline, fresh water and natural gas obtained after condensation and dehumidification are conveyed to a user or a collection station 19, the natural gas from the gas-liquid heat exchanger passes through the adjusting three-way valve 63, a part of the natural gas enters the burner for combustion, dry and cold air from the gas-liquid heat exchanger 15 enters the burner tail, the heated air is delivered to the solar air heat collector 10 by adjusting the three-way valve 61, and the heated air is delivered to the humidifier 13 by 20% and 80%, so that a cycle is completed.
While this patent has been described in detail in connection with the drawings and examples, the same is not to be considered as limited to the particular embodiments disclosed above, which are considered as illustrative and not restrictive in character, and that many modifications may be made by one skilled in the art without departing from the spirit of the invention, which is intended to be covered by the appended claims.
Claims (8)
1. The utility model provides a solar energy and LNG coupled humidification dehumidification method sea water desalination flow, its characterized in that, including utilizing solar energy evaporation plant, humidification device, gas-liquid heat exchanger, liquid-liquid heat exchanger, air heat collector, natural gas combustor and utilizing afterbody flue gas waste heat heating air device, connect through pipeline and send draught fan and water pump order between each device: wherein,
the solar evaporation device comprises a light-gathering heat collector and a seawater heat-absorption evaporation pipeline,
the humidifying device comprises a spraying device and a water-absorbing polyester porous sponge.
2. The solar-LNG coupled humidification and dehumidification seawater desalination process of claim 1, wherein the seawater evaporation plant and the air heat collector both utilize solar energy as a heat source.
3. The solar and LNG coupled humidification dehumidification-desalination process of claim 1, wherein the humidification-dehumidification-desalination and distillation-desalination are combined.
4. The process of claim 1, wherein the hot air at the outlet of the air heater is heated by the air heat collector or the waste heat of the tail flue gas, 20% of the hot air enters the seawater heat absorption evaporation pipeline, and the rest of the hot air enters the humidifying device, and the evaporation device and the outlet of the humidifying device are merged.
5. The solar-LNG coupled humidification dehumidification-desalination process of claim 1, wherein cold energy released from LNG is utilized to condense humid air and water vapor.
6. The process of claim 1, wherein the flow rate of the steam and the wet air at the outlet of the seawater heat absorption evaporation pipeline is slightly larger than the flow rate of the hot air at the inlet when the seawater heat absorption evaporation pipeline is started, and the inlet and the outlet are kept consistent during operation, so that the seawater heat absorption evaporation pipeline is in a constant negative pressure state.
7. The process of claim 1, wherein in severe weather, when solar energy is insufficient, the seawater channel into the natural gas burner is opened through the three-way valve, the natural gas channel into the natural gas burner is opened, and simultaneously the tail flue gas waste heat air heating device is put into operation.
8. The process of claim 1, wherein the pipelines are connected by a draught fan and a water pump, and the series and parallel connection is realized by adjusting a three-way valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624238A (en) * | 2020-10-28 | 2021-04-09 | 华中科技大学 | Inside and outside coagulation formula solar energy distillation sea water desalination |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005185988A (en) * | 2003-12-26 | 2005-07-14 | Xenesys Inc | Seawater desalination system |
| CN102557175A (en) * | 2011-11-19 | 2012-07-11 | 江苏同盛环保技术有限公司 | Device adopting dual-heat-source spray evaporation seawater desalination technology |
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2019
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| JP2005185988A (en) * | 2003-12-26 | 2005-07-14 | Xenesys Inc | Seawater desalination system |
| CN102557175A (en) * | 2011-11-19 | 2012-07-11 | 江苏同盛环保技术有限公司 | Device adopting dual-heat-source spray evaporation seawater desalination technology |
| CN106477658A (en) * | 2016-10-31 | 2017-03-08 | 武汉大学 | A kind of seawater desalination system based on LNG cold energy and method |
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| CN112624238A (en) * | 2020-10-28 | 2021-04-09 | 华中科技大学 | Inside and outside coagulation formula solar energy distillation sea water desalination |
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