CN101503228B - Win-win type solar energy sea water desalination apparatus for LNG ship and seawater desalination method thereof - Google Patents
Win-win type solar energy sea water desalination apparatus for LNG ship and seawater desalination method thereof Download PDFInfo
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- CN101503228B CN101503228B CN2009100475565A CN200910047556A CN101503228B CN 101503228 B CN101503228 B CN 101503228B CN 2009100475565 A CN2009100475565 A CN 2009100475565A CN 200910047556 A CN200910047556 A CN 200910047556A CN 101503228 B CN101503228 B CN 101503228B
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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
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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
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
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Abstract
The invention discloses an LNG shipping win-win type seawater desalination device and a seawater desalination method, belonging to the seawater desalination field. The LNG shipping win-win type seawater desalination device comprises a steam generating device and a condenser; wherein, the steam generating device comprises a greenhouse-shaped thermal-arrest-evaporator which comprise a water containing pool, the upper part of which is provided with an upper top and the bottom of which is provided with a heat collector used for absorbing solar energy so as to heat seawater and cause the seawater to evaporate to form the steam; the lower part of the water containing pool is provided with the condenser so as to cool off water vapor formed by seawater evaporation to form fresh water. The invention also discloses an LNG shipping win-win type seawater desalination method. As the LNG shipping is characterized by low internal temperature, the device has sufficient internal cold energy; therefore, the device not only can be used for making fresh water to meet domestic water of sea man and machinery equipment water, but also can cool off the outer wall of cargo holds, thus leaving out the injection water cooling link and saving energy consumption.
Description
Technical field:
The present invention relates to a kind of sea water desalinating plant and method for desalting seawater thereof, and be particularly related to a kind of LNG boats and ships Win-win type sea water desalinating plant, and utilize sun power to carry out the method for sea water desaltination.Utilize LNG boats and ships low temperature cargo tank to make condenser, saved condenser apparatus, and utilized sun power to carry out sea water desaltination.Improve the goods delivery tonnage and the flying power of boats and ships, improve economy, save energy.
Background technology:
Because China's Freshwater resources are very in short supply, therefore, people are being concerned about how to solve this difficult problem of sea water desaltination.LNG (Liquefied Natural Gas), the i.e. english abbreviation of natural gas liquids.Sweet natural gas is the inflammable gas of exploiting out naturally in the gas field, and main component is made up of methane.LNG is by under normal pressure, and natural gas in gaseous state is cooled to very low temperature-162 ℃, makes it to condense into liquid.Can save storage and transportation space and cost greatly after the natural gas liquefaction, and have characteristics such as calorific value is big, performance height.The LNG ship is meant the Special Ship that LNG is transported to receiving station from liquefaction factory.The storage tank of LNG ship is the special tectonic that is independent of hull.In the design of these boats and ships, the principal element of consideration is the material that can adapt to cryogenic media, to the processing of volatile or inflammable substance.Ship size is subjected to the restriction of port and pier and receiving station's condition usually.
The LNG ship's navigation needs the abundant fresh water of deposit in the sea, satisfying crewman's domestic water, and machinery equipment water.Lay in abundant fresh water, just need fresh-water tank do big especially because the finite volume of ship self like this, just need dwindle the volume of other clothing issue rooms.Simultaneously and since the LNG boats and ships in transportation for safety will keep low temperature, need water that the cargo tank wall is cooled off.
Because the LNG boats and ships itself have the low characteristics of internal temperature (internal temperature reaches-162 ℃), inner cold abundance; And the most navigation of LNG boats and ships have the temperature height in the Middle East, and the sun sunshine duration is long, region characteristics such as serious water shortage, and therefore, we have proposed a kind of LNG boats and ships Win-win type sea water desalinating plant, and utilize sun power to carry out the method for sea water desaltination.Adopt this device back with regard to having saved to making ship in the water spray refrigerative link that operational process keeps low temperature to carry out, reduce expenses, reduce the stress rupture of cargo hold steel plate, prolong the work-ing life of steel plate, guarantee ship security, the equipment novelty realizes doulbe-sides' victory.
Summary of the invention:
The object of the present invention is to provide a kind of LNG boats and ships Win-win type sea water desalinating plant, and utilize sun power to carry out the method for sea water desaltination.Itself have internal temperature low (internal temperature reaches-162 ℃) according to the LNG boats and ships, and most navigation in the characteristics of long region of sunshine duration a kind of solar energy evacuated boiling type seawater desalination system has been proposed.It can be used for making fresh water, thereby can reduce original fresh-water tank volume; Simultaneously, can cool off the cargo hold outer wall again, save water spray refrigerative link, save energy consumption.
To achieve these goals, technical scheme of the present invention is:
LNG boats and ships Win-win type sea water desalinating plant is characterized in that, comprises a steam generation device, a condenser; Described steam generation device comprises the thermal-arrest-vaporizer of a greenhouse shape; Described thermal-arrest-vaporizer comprises a water containing pool and the heat collector that is used to absorb sun power that is positioned at the bottom of water containing pool in order to the splendid attire seawater, is provided with top on described water containing pool top; Described condenser is arranged on described water containing pool bottom; Described condenser comprises internal layer condenser and outer condenser, the internal layer condenser is the cargo tank of LNG boats and ships, form a steam cooling space between internal layer condenser and the outer condenser, the liquid level of described steam cooling spatial top and water containing pool and the space between the inner face of last top communicate with vapour outlet between the last top by being arranged on water containing pool, cool off so that water vapour flow into described steam cooling space, bottom, described steam cooling space communicates with a pump well; Described pump well links to each other with a fresh-water tank by a wet-pit; Described water containing pool also connects a seawater transfer lime, and this seawater transfer lime feeds the sea, and this seawater transfer lime is provided with a lift pump.
Described thermal-arrest-vaporizer connects a vacuum pump by a valve tube; Described thermal-arrest-vaporizer is provided with a vacuum breaker valve.
Make by being convenient to the toughened glass that solar light penetrates on the described top of going up; The sidewall of water containing pool is provided with reflective mirror, is used for solar light is reflexed to water containing pool inside, to improve the heat absorption efficiency of seawater.
Described internal layer condenser is arranged on described water containing pool bottom, is provided with a thermal insulation layer between described water containing pool and the internal layer condenser.
Oval face all is arranged on the bottom surface of described water containing pool, last top, to increase the illumination receiving area.
The black heat-absorbing body of heat collector for making of described water containing pool bottom by isoprene-isobutylene rubber.
Described seawater transfer lime is provided with a feed-regulating valve.
Be provided with a water leg in bottom, described steam cooling space, described water leg is provided with a bottom discharge valve that communicates with described pump well.
Also be provided with a water outlet valve at described water shoot.
On described valve tube, be provided with a gas vacuum breaker.
The present invention connects a salt discharge pipeline on the water containing pool of described thermal-arrest-vaporizer, this salt discharge pipeline connects a blowdown pump.On described salt discharge pipeline, be provided with a salt road vacuum breaker.
Be provided with heat conductive rod between the internal layer condenser of condenser and the outer condenser, to increase cooling area.
LNG shipping win-win type seawater desalination method of the present invention comprises the steps:
(1) feedwater: guarantee that at first vacuum breaker valve, bottom discharge valve close, open feed-regulating valve and lift pump again, seawater is introduced in the water containing pool of thermal-arrest-vaporizer;
(2) vacuumize: open vacuum pump, the aperture of adjustments of gas vacuum breaker makes the vacuum tightness in thermal-arrest-vaporizer reach 90%-98%, and corresponding vaporization temperature is the 30-35 degree;
(3) heating: solar light sees through the upward top of being made by transparent toughened glass and shines on the heat collector and the lateral reflective mirror of water containing pool of water containing pool bottom, heat collector heats seawater after absorbing sun power, simultaneously the lateral reflective mirror of water containing pool reflexes to solar light in the space on top at the bottom of the water containing pool, seawater in the water containing pool is heated, make the seawater start vaporizer, form wetting vapour;
(4) cooling: wetting vapour is in the steam cooling space that enters into by vapour outlet under wet-pit and the diffusion of self between internal layer condenser and the outer condenser, the internal layer condenser is passed to outer condenser by the cold energy of cargo tank transmission and with cold energy by heat conductive rod, cool off entering steam cooling spatial wetting vapour, wetting vapour is fully cooled off the back and is formed water of condensation, be collected in the water leg, open bottom discharge valve water of condensation is entered pump well;
(5) discharge water of condensation:, start wet-pit, and open the water outlet valve, to fresh-water tank row fresh water when the condensate water level in the pump well reaches pump well height half when high.
Because the LNG boats and ships itself have the low characteristics of internal temperature (internal temperature reaches-162 ℃), inner cold abundance; And the most navigation of LNG boats and ships have the temperature height in the Middle East, and the sun sunshine duration is long, region characteristics such as serious water shortage.Therefore, adopt and both can be used for making fresh water behind LNG boats and ships Win-win type sea water desalinating plant of the present invention and the method for desalting seawater thereof, satisfy crewman's domestic water and machinery equipment water, thereby can reduce original fresh-water tank volume, many oil bunkerings, goods, accumulating product etc., the goods that improves boats and ships delivers tonnage and flying power; Simultaneously, can cool off the cargo hold outer wall again, save water spray refrigerative link, save energy consumption, reduce the stress rupture of cargo hold steel plate, prolong the work-ing life of steel plate, guarantee ship security, realize doulbe-sides' victory.The present invention helps energy-conserving and environment-protective, improves economy, has vast potential for future development.
Description of drawings:
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the theory structure synoptic diagram of LNG boats and ships Win-win type sea water desalinating plant of the present invention;
Fig. 2 is a LNG boats and ships Win-win type sea water desalinating plant system architecture synoptic diagram of the present invention.
Embodiment:
For technique means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 1, LNG boats and ships Win-win type sea water desalinating plant of the present invention is made of steam generation device and condenser, and steam generation device is the thermal-arrest-vaporizer of a greenhouse shape, and it comprises a water containing pool 1 and heat collector 12, water containing pool 1 is made one pot of type, in order to the splendid attire seawater.Sidewall in water containing pool 1 is provided with reflective mirror 13, and the effect of reflective mirror 13 is that solar light is reflexed to water containing pool 1 inside, with the seawater in the heating water containing pool 1.Be stamped on the top of water containing pool 1 and push up 11 on one, top 11 adopts toughened glass to make on this, so that solar ray penetrates, shines in the seawater in the water containing pool 1 and shines simultaneously on the reflective mirror 13.The bottom surface of water containing pool 1, on push up 11 and all be arranged to oval face, to increase illuminating area.
Bottom at thermal-arrest-vaporizer is provided with condenser, condenser is divided into outer condenser 2 and internal layer condenser 3, internal layer condenser 3 is the cargo tank of LNG boats and ships, internal layer condenser 3 is located at the bottom of water containing pool 1, be provided with a thermal insulation layer 4 between water containing pool 1 and the internal layer condenser 3, thermal insulation layer 4 is used for thermal insulation, prevents that solar heat from passing to internal layer condenser 3 at the bottom of water containing pool 1 pond, cause unnecessary waste.Be provided with heat conductive rod 21 between outer condenser 2 and the internal layer condenser 3, the purpose one that heat conductive rod 21 is set is to support outer condenser 2, two, and cold energy is passed to outer condenser 2 by internal layer condenser 3, to increase cooling area.
After seawater was evaporated, the formation water vapor can accumulate in the liquid level of water containing pool 1 gradually and go up in the space of pushing up between 11 inner faces.
Referring to Fig. 2, connect a drinking-water pipe 112 on the water containing pool 1 of thermal-arrest-vaporizer, this drinking-water pipe 112 leads to seawater, and this drinking-water pipe 112 connects a lift pump 114 and be provided with feed-regulating valve 113 on drinking-water pipe 112, lift pump 114 is extracted into seawater in the water containing pool 1, and feed-regulating valve 113 is in order to regulate flow.
Between outer condenser 2 and internal layer condenser 3, form a steam cooling space 25, the liquid level of the top in this steam cooling space 25 and water containing pool 1 and the space of going up between 11 inner faces of top communicate with vapour outlet 26 between the last top 11 by being arranged on water containing pool 1, be provided with a return flume 22 in the bottom in this steam cooling space 25, water leg 22 is used to collect the fresh water (water of condensation) that forms through 25 condensations of steam cooling space, be provided with a bottom discharge valve 221 on return flume 22, bottom discharge valve 221 communicates with the pump well 5 that is positioned at water containing pool 1 bottom.Open bottom discharge valve 221, the fresh water (water of condensation) in the water leg 22 just can be transported in the pump well 5.
Pump well 5 links to each other with fresh-water tank 6 by a water shoot 53, is provided with wet-pit 52 and water outlet valve 51 on water shoot 53, and opening water discharge pump 52 and water outlet valve 51 just can be transported to the fresh water (water of condensation) in the pump well 5 in the fresh-water tank 6.
Thermal-arrest-vaporizer also links to each other with a vacuum pump 232 by a valve tube 23, is provided with a gas vacuum breaker 231 on valve tube 23.Before the seawater in the water containing pool 1 is evaporated, need vacuumize thermal-arrest-vaporizer, at this moment just need to open vacuum pump 232, and gas vacuum breaker 231 is adjusted to suitable aperture, when treating that thermal-arrest-vaporizer is extracted into the vacuum tightness of 90%-98%, close vacuum pump 232.On thermal-arrest-vaporizer, also be provided with a vacuum breaker valve 111.Thermal-arrest-vaporizer is extracted into the vacuum tightness of 90%-98%, mainly is the evaporation that is beneficial to seawater.
Water containing pool 1 also links to each other with a blowdown pump 242 by a salt discharge pipeline 24, and salt discharge pipeline 24 is provided with a salt road vacuum breaker 241.The residual many salt of meeting behind the evaporation of seawater in thermal-arrest-vaporizer are so after fresh water is through desalination, need discharge the residual salt in thermal-arrest-vaporizer through salt discharge pipeline 24.
Method for desalting seawater of the present invention when concrete operations, comprises the steps:
(1) feedwater: guarantee that at first vacuum breaker valve 111, bottom discharge valve 221 closed, open feed-regulating valve 113 and lift pump 114 again, seawater is introduced in the water containing pool 1 of thermal-arrest-vaporizer;
(2) vacuumize: open vacuum pump 232, the aperture of adjustments of gas vacuum breaker 231 makes the vacuum tightness in thermal-arrest-vaporizer reach 90%-98%, and corresponding vaporization temperature is the 30-35 degree;
(3) heating: solar light sees through the top 11 of going up of being made by transparent toughened glass and shines on the heat collector 4 and water containing pool 1 lateral reflective mirror 13 of water containing pool 1 bottom, after heat collector 4 absorbs sun power seawater is heated, water containing pool 1 lateral reflective mirror 13 reflexes to solar light in the space on top, 1 end of water containing pool simultaneously, with the heating of the seawater in the water containing pool 1, make the seawater start vaporizer, form wetting vapour;
(4) cooling: wetting vapour is in the steam cooling space 25 that enters into by vapour outlet 26 under wet-pit 52 and the diffusion of self between internal layer condenser 2 and the outer condenser 3, internal layer condenser 3 is passed to outer condenser 2 by the cold energy of cargo tank transmission and with cold energy by heat conductive rod 21, the wetting vapour that enters steam cooling space 25 is cooled off, wetting vapour is fully cooled off the back and is formed water of condensation, be collected in the water leg 22, open bottom discharge valve 221 water of condensation is entered pump well 5;
(5) discharge water of condensation:, start wet-pit 52, and open water outlet valve 51, to fresh-water tank 6 row's fresh water when the condensate water level in the pump well 5 reaches pump well 5 height half when high.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (12)
1.LNG boats and ships Win-win type sea water desalinating plant is characterized in that, comprises a steam generation device, a condenser; Described steam generation device comprises the thermal-arrest-vaporizer of a greenhouse shape; Described thermal-arrest-vaporizer comprises a water containing pool and the heat collector that is used to absorb sun power that is positioned at the bottom of water containing pool in order to the splendid attire seawater, is provided with top on described water containing pool top; Described condenser is arranged on described water containing pool bottom; Described condenser comprises internal layer condenser and outer condenser, the internal layer condenser is the cargo tank of LNG boats and ships, form a steam cooling space between internal layer condenser and the outer condenser, the liquid level of described steam cooling spatial top and water containing pool and the space between the inner face of last top communicate with vapour outlet between the last top by being arranged on water containing pool, cool off so that water vapour flow into described steam cooling space, bottom, described steam cooling space communicates with a pump well; Described pump well links to each other with a fresh-water tank by a wet-pit; Described water containing pool also connects a seawater transfer lime, and this seawater transfer lime feeds the sea, and this seawater transfer lime is provided with a lift pump.
2. LNG boats and ships Win-win type sea water desalinating plant according to claim 1 is characterized in that described thermal-arrest-vaporizer connects a vacuum pump by a valve tube; Described thermal-arrest-vaporizer is provided with a vacuum breaker valve.
3. LNG boats and ships Win-win type sea water desalinating plant according to claim 1 is characterized in that, make by being convenient to the toughened glass that solar light penetrates on the described top of going up; The sidewall of water containing pool is provided with reflective mirror, is used for solar light is reflexed to water containing pool inside, to improve the heat absorption efficiency of seawater.
4. LNG boats and ships Win-win type sea water desalinating plant according to claim 1 is characterized in that described internal layer condenser is arranged on described water containing pool bottom, is provided with a thermal insulation layer between described water containing pool and the internal layer condenser.
5. LNG boats and ships Win-win type sea water desalinating plant according to claim 1 is characterized in that, oval face all is arranged on the bottom surface of described water containing pool, last top, to increase the illumination receiving area.
6. LNG boats and ships Win-win type sea water desalinating plant according to claim 1 is characterized in that, the black heat-absorbing body of heat collector for being made by isoprene-isobutylene rubber of described water containing pool bottom.
7. LNG boats and ships Win-win type sea water desalinating plant according to claim 1 is characterized in that described seawater transfer lime is provided with a feed-regulating valve.
8. LNG boats and ships Win-win type sea water desalinating plant according to claim 1 is characterized in that, is provided with a water leg in bottom, described steam cooling space, and described water leg is provided with a bottom discharge valve that communicates with described pump well.
9. LNG boats and ships Win-win type sea water desalinating plant according to claim 2 is characterized in that, is provided with a gas vacuum breaker on described valve tube.
10. LNG boats and ships Win-win type sea water desalinating plant according to claim 1 is characterized in that connect a salt discharge pipeline on the water containing pool of described thermal-arrest-vaporizer, this salt discharge pipeline connects a blowdown pump, is provided with a salt road vacuum breaker on described salt discharge pipeline.
11. LNG boats and ships Win-win type sea water desalinating plant according to claim 1 is characterized in that, is provided with heat conductive rod between the internal layer condenser of condenser and the outer condenser, to increase cooling area.
12.LNG shipping win-win type seawater desalination method is characterized in that it comprises the steps:
(1) feedwater: guarantee that at first vacuum breaker valve, bottom discharge valve close, open feed-regulating valve and lift pump again, seawater is introduced in the water containing pool of thermal-arrest-vaporizer;
(2) vacuumize: open vacuum pump, the aperture of adjustments of gas vacuum breaker makes the vacuum tightness in thermal-arrest-vaporizer reach 90%-98%, and corresponding vaporization temperature is 3035 degree;
(3) heating: solar light sees through the upward top of being made by transparent toughened glass and shines on the heat collector and the lateral reflective mirror of water containing pool of water containing pool bottom, heat collector heats seawater after absorbing sun power, simultaneously the lateral reflective mirror of water containing pool reflexes to solar light in the space on top at the bottom of the water containing pool, seawater in the water containing pool is heated, make the seawater start vaporizer, form wetting vapour;
(4) cooling: wetting vapour is in the steam cooling space that enters into by vapour outlet under wet-pit and the diffusion of self between internal layer condenser and the outer condenser, the internal layer condenser is passed to outer condenser by heat conductive rod with the cold energy of cargo tank, cool off entering steam cooling spatial wetting vapour, wetting vapour is fully cooled off the back and is formed water of condensation, be collected in the water leg, open bottom discharge valve water of condensation is entered pump well;
(5) discharge water of condensation:, start wet-pit, and open the water outlet valve, to fresh-water tank row fresh water when the condensate water level in the pump well reaches pump well height half when high.
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| CN2009100475565A CN101503228B (en) | 2009-03-13 | 2009-03-13 | Win-win type solar energy sea water desalination apparatus for LNG ship and seawater desalination method thereof |
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| CN2009100475565A CN101503228B (en) | 2009-03-13 | 2009-03-13 | Win-win type solar energy sea water desalination apparatus for LNG ship and seawater desalination method thereof |
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| CN101792193B (en) * | 2010-03-19 | 2012-05-02 | 浙江大学 | Device and method for desalting seawater by using cold energy of liquefied natural gas |
| CN103130291A (en) * | 2013-01-31 | 2013-06-05 | 武汉理工大学 | Solar sea water desalination device applied to lifeboats |
| CN104016431B (en) * | 2013-02-28 | 2016-01-13 | 刘文晏 | Solar energy sea water desalination apparatus |
| CN104671312B (en) * | 2015-02-15 | 2016-06-08 | 中国石油大学(华东) | A kind of emergency semi-submersible type sea water desalinating unit |
| CN106064840B (en) * | 2016-06-30 | 2019-01-11 | 浙江大学 | The poly- sunlight heat evaporator of colored particle |
| CN106477658B (en) * | 2016-10-31 | 2019-09-10 | 武汉大学 | A kind of seawater desalination system and method based on LNG cold energy |
| CN106628094A (en) * | 2016-12-12 | 2017-05-10 | 浙江海洋大学 | Air-based water production device using LNG powered ship for recovering cooling and heating energy |
| CN114314721A (en) * | 2021-12-31 | 2022-04-12 | 王金雨 | Edible salt production equipment and production method |
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