JP2007137765A - Apparatus for producing concentrated salt water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an apparatus for producing concentrated salt water, which requires no vast installation area and the energy consumption of which is made small. <P>SOLUTION: After seawater 90 is stored in a concentrated salt water tank 24 by operating a raw water pump 12, the seawater 90 in the concentrated salt water tank 24 is heated and circulated between the concentrated salt water tank 24 and a membrane distillation module 18 by operating a circulation pump 34 and a heat source 40. Unheated seawater 90 is made to pass through the membrane distillation module 18 so that only fresh water is extracted from the circulating seawater in the membrane distillation module 18 and discharged. Since salinity of the circulating seawater becomes higher gradually, the circulation of the seawater is stopped when the salinity reaches 15%. After that, the concentrated salt water stored in the concentrated salt water tank 24 is transferred to an evaporation tank 42 and heated by operating another heat source 44 to produce the concentrated salt water having about 18% salinity. The concentrated salt water is sprayed toward the inner wall of a rock salt room 54 via a sprayer 52 by operating a pressure pump 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a concentrated salt water generating device, and more particularly to a concentrated salt water generating device that generates concentrated salt water having a salt concentration higher than seawater.

  Conventionally, as a method that can be applied as a technique for generating concentrated salt water having a salt concentration higher than that of seawater, there are a sun salt method, a salt field-sengo method, and an ion exchange membrane method (electrodialysis method).

  FIG. 11 collectively shows the procedures of the sun salt field method, the salt field-sengo method, and the ion exchange membrane method. In addition, the broken line of the arrow in the same figure has shown the flow of each procedure of the sun salt field method, a dashed-dotted line is the Shioda-Sango method, and a solid line is the ion exchange membrane method.

  As shown in the figure, the sun salt field method generates brine with increased salinity by evaporating the water in the seawater stored in the salt field using solar energy, and the salt water continues to generate solar water in the salt field. Evaporation is continued to produce a crystalline salt.

  In addition, the Shioda-Sengou method generates brine with increased salt concentration by evaporating the water in the seawater stored in the saltada with solar energy and wind, and boiles the brine in an evaporating crystal can to boil the brine. The water is evaporated to produce a solid salt.

  In the ion exchange membrane method, as shown in FIG. 12, two ion exchange membranes 97 are provided at a predetermined interval in a container in which seawater 90 is stored, and one ion exchange membrane 97 in the container is placed outside. The positive electrode 98A is installed outside the other ion exchange membrane 97, and the negative electrode 98B is installed so as to be immersed in the seawater 90. Electricity is passed through the seawater 90 to move ions. To produce salt water with increased salinity by discharging only fresh water after separating into salt water and concentrated salt water, and evaporating the water in the brine by boiling the brine in an evaporating crystal can It is.

  Brine water produced as an intermediate stage in each of the above-mentioned sun salt field method, salt field-sengo method, and ion exchange membrane method corresponds to concentrated salt water having a higher salt concentration than sea water.

  On the other hand, the therapy using marine resources such as seawater and seaweed and marine climate, and the effectiveness of thalassotherapy (marine therapy) that enhances the physical and mental functions by utilizing the natural healing power that humans originally possess Are known.

  As one of the facilities for this thalassotherapy, there is a salt room where the inner wall is covered with a salt layer, and the inside of the salt room is a space filled with negative ions emitted from the salt layer. It is effective for health promotion.

Conventionally, there has been no technique for artificially constructing such a salt room.
Japanese Patent Laid-Open No. 10-245219

  However, the above-mentioned Sun Shioda method and Shioda-Sengo method have a problem in that a vast land is required to configure the salt field.

  In addition, the above-described ion exchange membrane method has a problem that the amount of electric energy consumed is very large.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a concentrated salt water generating device that does not require a large installation area and consumes less energy.

  In order to achieve the above object, the concentrated salt water generation device according to claim 1 includes a first tank that stores seawater, a first heating means that heats the seawater stored in the first tank, and an internal And a first passage through which the warm seawater is disposed and a second passage through which the cold seawater passes, and the seawater heated by the first heating means is the first passage. The first concentrated salt water is extracted by extracting only fresh water from the heated seawater when unsealed seawater circulated between the tank and the first passage and unheated in the second passage is passed. First concentrated salt water generating means to be generated, a second tank for storing the first concentrated salt water generated by the first concentrated salt water generating means, and the first tank stored in the second tank Stored in the second tank by heating the concentrated salt water A second heating means for the second concentrated brine to increase the salt concentration of the first concentrated water which has a.

  According to the concentrated salt water generating device of claim 1, the first device is provided with a first passage through which warm seawater is disposed and a second passage through which cold seawater passes, which are arranged across a membrane provided therein. Seawater heated by the first heating means is circulated between the first tank storing the seawater and the first passage by the concentrated salt water generation means, and is not heated by the second passage. Is passed, only fresh water is extracted from the heated seawater to produce a first concentrated salt water. The upper limit of the salt concentration of the first concentrated salt water generated at this time is a predetermined concentration determined based on the characteristics of the membrane provided in the first concentrated salt water generating means. The fresh water extraction method by the first concentrated salt water generating means described above is called a membrane distillation method.

  Next, after the first concentrated salt water generated by the first concentrated salt water generating means is stored in the second tank, the first concentrated salt water stored in the second tank by the second heating means. Is heated to produce a second concentrated salt water in which the salt concentration of the first concentrated salt water is increased.

  Thus, according to the concentrated salt water generator of claim 1, unheated seawater is used as a cooling source in the membrane distillation method, and unheated seawater and heated seawater are respectively used. Since the first concentrated salt water is generated by passing the inside of one concentrated salt water generating means adjacent to each other across the membrane, the energy efficiency is very good and the energy consumption can be reduced. The heating area of seawater can be reduced, and the installation area of equipment can be reduced.

  Further, the concentrated salt water generating device according to claim 2 is the concentrated salt water generating device according to claim 1, wherein the seawater heated by the first heating means is between the first tank and the first passage. And the circulation between the first tank and the first passage is stopped when the salinity of the seawater stored in the first tank reaches a predetermined concentration. Control means for controlling is further provided.

  The concentrated salt water generating device according to claim 3 is the concentrated salt water generating device according to claim 2, wherein the control means is configured to control the first tank based on a salinity concentration of the raw water of the seawater and a dimension of the first tank. The water level when the salinity concentration of the seawater stored in the tank reaches the predetermined concentration is calculated, and stored in the first tank when the water level of the first tank reaches the calculated water level. It is determined that the salinity concentration of the seawater that has been reached has reached the predetermined concentration, and control is made to stop the circulation.

  Further, the concentrated salt water generating device according to claim 4 is the concentrated salt water generating device according to claim 2 or claim 3, wherein the control unit is configured to control the first concentrated salt water stored in the second tank. The heating operation by the second heating unit is controlled, and the heating operation is stopped when the salt concentration of the first concentrated salt water stored in the second tank reaches a second predetermined concentration. It is characterized by controlling to.

  Further, the concentrated salt water generating device according to claim 5 is the concentrated salt water generating device according to claim 4, wherein the control means includes the salt concentration of the first concentrated salt water stored in the second tank and the first concentration. Based on the dimensions of the second tank, the water level when the salt concentration of the first concentrated salt water stored in the second tank reaches the second predetermined concentration is calculated, and the calculated water level is calculated. When the water level of the second tank reaches, it is determined that the salt concentration of the first concentrated salt water stored in the second tank has reached the second predetermined concentration, and the heating operation is stopped. It is characterized by controlling to do.

  According to the concentrated salt water generating apparatus of claim 1, unheated seawater is used as a cooling source in the membrane distillation method, and unheated seawater and heated seawater are respectively generated as first concentrated saltwater. Since the first concentrated salt water is generated by passing the inside of the means adjacent to each other across the membrane, the energy efficiency is very good, the energy consumption can be reduced, and the heating area of the seawater is reduced. The effect that it can be made small and the installation area of an installation can be made small is acquired.

  Hereinafter, with reference to drawings, embodiment of the concentrated salt water generating device concerning the present invention is described in detail. In addition, the following embodiment demonstrates the case where a rock salt room is constructed using the concentrated salt water produced | generated with the concentrated salt water production | generation apparatus which concerns on this invention.

[First Embodiment]
First, with reference to FIG. 1, the principle of the membrane distillation method applied in this embodiment as a 1st concentrated salt water production | generation means of the concentrated salt water production | generation apparatus of this invention is demonstrated.

  As shown in the figure, in the membrane distillation method applied in the present embodiment, warm seawater 90A heated to a predetermined temperature on one side partitioned by a membrane 92 having a thickness of about 300 microns is parallel to the surface of the membrane 92 ( In addition to flowing in the direction of arrow A in FIG. 1, cold seawater 90B having a temperature lower than that of the warm seawater 90A is flowed in the opposite direction (in the direction of arrow B in FIG. 1).

  Accordingly, a temperature difference is generated on both sides of the membrane 92. Due to this temperature difference, the steam of the warm seawater 90A moves through the membrane 92 in the direction of arrow C in FIG. 1, and is cooled by the passage of the cold seawater 90B. The water 94 is condensed on the surface 94 to form water droplets 96, and the water droplets 96 can be moved in the direction of arrow D in FIG. 1 to obtain fresh water. Therefore, the warm seawater 90A after carrying out such a membrane distillation method becomes a salt water whose salt concentration is increased in accordance with the amount of the obtained fresh water.

  Next, with reference to FIG. 2, the structure of the concentrated salt water production | generation apparatus 10, the rock salt room 54, and its periphery which concern on this 1st Embodiment is demonstrated. As shown in the figure, the concentrated salt water generation device 10 according to the first embodiment includes a raw water pump 12 that pumps up seawater 90, and an outlet of the raw water pump 12 that flows out of the seawater 90 is an inlet of the filtration device 14. It is piped in. In addition, the raw | natural water pump 12 is connected to the control panel 32 which controls operation | movement of the concentrated salt water production | generation apparatus 10 whole, The control panel 32 can control the action | operation of the raw | natural water pump 12 at any time.

  The outlet for flowing out the seawater 90 that has been filtered by the filtration device 14 is connected to the inlet for flowing in the cold seawater 90B of the membrane distillation membrane module 18 that realizes the membrane distillation method described above, and the membrane distillation membrane module 18 The outflow port for flowing out the cold seawater 90 </ b> B is connected to the inflow port of the motor valve 22 for 1 inflow and 2 outflow where the outflow direction is changed by the motor 20. The motor 20 is connected to the control panel 32, and the control panel 32 can change the outflow direction of the motor valve 22 at any time.

  One outlet of the motor valve 22 is piped to the inlet of the concentrated salt water tank 24, and the other outlet of the motor valve 22 is connected to the outside of the concentrated salt water generator 10. Further, a level meter 28 for detecting the level of salt water stored in the concentrated salt water tank 24 is installed above the concentrated salt water tank 24, and further, inside the concentrated salt water tank 24, A sensor 30 for detecting the salinity of the stored salt water is installed. The level meter 28 and the sensor 30 are connected to the control panel 32, and the control panel 32 can know the water level and the salinity concentration of the salt water stored in the concentrated salt water tank 24 at any time. As the sensor 30, an electric conductivity meter, a salinity meter, or the like can be applied (the same applies to the sensor 48 described later).

  On the other hand, the outlet of the concentrated salt water tank 24 is connected to the inlet of the circulation pump 34, and the outlet of the circulation pump 34 is connected to the inlet of the motor valve 38 of 1 inflow and 2 outflow whose outflow direction is changed by the motor 36. It is piped. The circulation pump 34 and the motor 36 are connected to the control panel 32. The control panel 32 can control the operation of the circulation pump 34 and change the outflow direction of the motor valve 38 at any time.

  One outlet of the motor valve 38 is connected to the inlet of the evaporation tank 42, and the other outlet is a heat source 40 that heats the salt water that has flowed in to a predetermined temperature (up to about 80 ° C. in this embodiment). It is piped at the inflow port. The heat source 40 is connected to the control panel 32 (connection lines are not shown), and the control panel 32 can control the salt water heating operation by the heat source 40.

  Further, the outlet of the heat source 40 is connected to the inlet of the membrane distillation membrane module 18 through which the warm seawater 90A flows, and the outlet of the membrane distillation membrane module 18 through which the warm seawater 90A flows out is the inlet of the concentrated salt water tank 24. The outlet from which the fresh water of the membrane distillation membrane module 18 flows out is piped to the outside of the concentrated salt water generation apparatus 10.

  On the other hand, a level meter 46 for detecting the level of salt water stored in the evaporation tank 42 is installed above the evaporation tank 42, and the salt water stored in the evaporation tank 42 is provided inside the evaporation tank 42. A sensor 48 for detecting the salinity concentration is installed, and a heat source 44 for heating salt water stored in the evaporation tank 42 is installed integrally with the evaporation tank 42 below the evaporation tank 42. The heat source 44, the level meter 46, and the sensor 48 are connected to the control panel 32 (connection lines from the heat source 44 to the control panel 32 are not shown), and the control panel 32 is stored in the evaporation tank 42 by the heat source 44. It is possible to control the heating operation of the salt water, and to know the water level and salt concentration of the salt water stored in the evaporation tank 42 at any time. Further, by the heating operation by the heat source 44, the water of the salt water stored in the evaporation tank 42 is released to the outside of the evaporation tank 42 as water vapor.

  The outlet of the evaporation tank 42 is connected to the inlet of the pressure pump 50, and the outlet of the pressure pump 50 is connected to the inlet of the sprayer 52 such as a nozzle or a spray gun. At this time, the sprayer 52 can be moved to an arbitrary position in the salt room 54 to be constructed by the installer, and can direct the outlet (outlet) in an arbitrary direction. Has been. The pressure pump 50 is connected to the control panel 32, and the control panel 32 can control the operation of the pressure pump 50 at any time.

  On the other hand, a drainage channel 56 is provided on the floor surface of the rock salt room 54, and the outlet of the drainage channel 56 is located at the outer edge of the upper end of the storage tank 58, and the drainage (salt water) discharged from the drainage channel 56 is It is stored in the storage tank 58. In addition, a level meter 59 that detects the level of salt water stored in the storage tank 58 is installed in the upper part of the storage tank 58. The level meter 59 is connected to the control panel 32, and the control panel 32 can know the water level of the salt water stored in the storage tank 58 at any time.

  Further, in the vicinity of the storage tank 58, a water intake pump 60 whose inlet is connected to the storage tank 58 is installed, and an outlet of the water intake pump 60 is connected to an inlet of the filtration device 62, and further the filtration device. The outlet 62 is connected to the inlet of the evaporation tank 42. The intake pump 60 is connected to the control panel 32, and the control panel 32 can control the operation of the intake pump 60 at any time.

  The membrane distillation membrane module 18 is the first concentrated salt water generating means of the present invention, the concentrated salt water tank 24 is the first tank of the present invention, the heat source 40 is the first heating means of the present invention, and the evaporation tank 42. Corresponds to the second tank of the present invention, and the heat source 44 corresponds to the second heating means of the present invention.

  Next, the operation of the apparatus configured as described above will be described. First, the control panel 32 starts the operation of the raw water pump 12 after the motor 20 sets the outflow direction of the motor valve 22 to the concentrated salt water tank 24 side. As a result, the seawater 90 is pumped up by the raw water pump 12, and the pumped seawater 90 passes through the filtration device 14, the membrane distillation membrane module 18, and the motor valve 22 in order, and then enters the concentrated saltwater tank 24. Storage of the seawater 90 is started.

  Next, the control panel 32 detects the water level in the concentrated salt water tank 24 with the level meter 28, and when the water level reaches the upper limit water level of the concentrated salt water tank 24, the motor 20 controls the outflow method of the motor valve 22 with concentrated salt water. The direction is changed to the outside of the generation device 10. Therefore, the seawater 90 pumped up by the raw water pump 12 is subsequently discharged through the filtration device 14, the membrane distillation membrane module 18, and the motor valve 22 to the outside of the concentrated salt water generation device 10.

  Next, after setting the outflow direction of the motor valve 38 to the membrane distillation membrane module 18 side by the motor 36, the control panel 32 starts the operation of the circulation pump 34 and the heating operation by the heat source 40. As a result, the seawater 90 heated to about 80 ° C. by the heat source 40 is circulated between the concentrated salt water tank 24 and the membrane distillation membrane module 18. During this circulation, unheated seawater 90 is passed through the membrane distillation membrane module 18, so the membrane distillation membrane module is caused by a temperature difference between the unheated seawater 90 and the heated seawater 90. 18, fresh water is extracted from the heated seawater 90, and the extracted fresh water is discharged to the outside of the concentrated salt water generator 10. On the other hand, since the water in the seawater 90 is extracted as fresh water, the amount of the seawater 90 that is heated gradually decreases and the salinity concentration increases. In the concentrated salt water generating apparatus 10 according to the present embodiment, the seawater 90 (salt water) stored in the concentrated salt water tank 24 can be concentrated until the salinity concentration reaches about 15% at the maximum. About 15% is an upper limit set from the characteristics of the membrane material of the membrane distillation membrane module 18 used in the present embodiment. Therefore, this value is an example, and varies depending on the characteristics of the film material used.

  Next, the control panel 32 detects the salinity concentration of the salt water in the concentrated salt water tank 24 by the sensor 30, and when the salinity concentration reaches 15%, the raw water pump 12 and the circulation pump 34 are operated and the heat source 40 is heated. Then, the outflow direction of the motor valve 38 is changed to the evaporation tank 42 side by the motor 36, and the operation of the circulation pump 34 is resumed. Thereby, the water supply to the evaporation tank 42 of the concentrated salt water in which the salt concentration stored in the concentrated salt water tank 24 is 15% is started.

  Next, the control panel 32 detects the water level in the evaporation tank 42 with the level meter 46, stops the operation of the circulation pump 34 when the water level reaches the upper limit water level of the evaporation tank 42, and then performs the heating operation by the heat source 44. To start. As a result, heating of the concentrated salt water stored in the evaporation tank 42 is started, so that moisture of the concentrated salt water becomes steam and is discharged to the outside of the evaporation tank 42 as time elapses. As the salt concentration gradually decreases, the salt concentration gradually increases. Therefore, the control panel 32 detects the salt concentration in the evaporation tank 42 by the sensor 48, and stops the heating operation of the heat source 44 when the salt concentration reaches 18%. The 18% is a salt concentration at which salts in seawater begin to precipitate.

  Thereafter, the control panel 32 starts the operation of the pressure pump 50 in accordance with an instruction from the installer. Accordingly, since the concentrated salt water having a salinity concentration of about 18% stored in the evaporation tank 42 is blown out from the outlet of the spraying device 52, the operator grasps the spraying device 52 and then sprays the spraying device. The concentrated salt water blown from 52 is sprayed over the entire wall surface in the rock salt room 54.

  As a result, the concentrated salt water sprayed on the wall surface in the rock salt room 54 flows down in the direction of arrow E in FIG. 2 along the surface of the wall surface, and salt crystals deposited during this flow adhere to the wall surface. On the other hand, the concentrated salt water that has flowed down to the floor surface of the rock salt room 54 moves in the drainage channel 56 in the direction of arrow F in FIG.

  Thereafter, the control panel 32 operates the water intake pump 60 to take in the concentrated salt water stored in the storage tank 58, and after passing through the filtration device 62, the control panel 32 flows out into the evaporation tank 42. In this way, the concentrated salt water that has flowed into the evaporation tank 42 is pressurized again by the pressure pump 50 and sprayed onto the wall surface of the rock salt room 54.

  The concentrated salt water stored in the evaporation tank 42 is sprayed on the wall surface in the rock salt room 54, flows into the storage tank 58 through the drainage channel 56 of the concentrated salt water that has flowed down to the floor surface of the rock salt room 54, and by the intake pump 60. While repeating a series of operations of taking the concentrated salt water stored in the storage tank 58 and flowing out to the evaporation tank 42 through the filtering device 62, the concentrated salt water is concentrated by evaporation of water. Accordingly, crystals precipitate in the surface of the rock salt room 54 and in the storage tank 58 and the amount of water gradually decreases. Therefore, the level of the concentrated salt water stored in the storage tank 58 is measured by the level meter 59, When the measured value falls below a certain value, the operation of the pressure pump 50 and the water intake pump 60 is stopped, and the seawater 90 is again taken into the concentrated salt water tank 24, concentrated by the membrane distillation membrane module 18, and by the evaporation tank 42. By performing the concentration, the spraying operation on the wall surface in the rock salt room 54 is resumed when concentrated salt water having a salt concentration of about 18% is sufficiently accumulated in the evaporation tank 42.

  Thus, in the concentrated salt water generating apparatus 10 according to the first embodiment, the seawater 90 is concentrated until the salinity concentration reaches about 15% by the membrane distillation method that does not require a relatively large amount of heat. Compared to the case where the method is used, the rock salt room can be constructed with less energy consumption, and the site area for installing the facilities can be made narrower than the case where the salt field is used.

  In the salt room construction method according to the first embodiment, since the salt layer is formed on the inner wall of the salt room 54 only by repeatedly spraying concentrated salt water on the inner wall of the salt room 54, the salt room can be easily formed. Can be constructed.

  In addition, in this 1st Embodiment, although the case where a constructor performs operation which sprays concentrated salt water on the wall surface in the rock salt room 54 was demonstrated, if it is a form which can spray concentrated salt water on the wall surface in the rock salt room 54 Any form may be used, for example, a form as shown in FIG.

  As shown in the figure, in this embodiment, a watering pipe 70 provided with a plurality of outlets at a predetermined interval is provided in the vicinity of the ceiling surface in the salt room 54, and the outlet of the pressure pump 50 is used as the watering pipe 70. It was piped at the inflow port. In this case, the operation of automatically spraying concentrated salt water on the wall surface in the rock salt room 54 or allowing it to flow in a shower-like manner can be repeatedly performed by only driving the pressure pump 50 and the water intake pump 60 without involving the installer. As a result, labor costs can be reduced.

  Moreover, although this 1st Embodiment demonstrated the case where concentrated salt water was sprayed with respect to the wall surface in the salt room 54 in a normal environment and a rock salt layer was formed, the dehumidification inside the salt room 54 was carried out in the case of this spraying By making the inside of the salt room 54 dry by performing heating of the air in the salt room 54, the salt layer on the wall surface in the salt room 54 can be formed more quickly. Further, the wall salt layer sprayed on the wall surface in the rock salt room 54 can be formed more quickly by heating the wall surface around which the concentrated salt water has been sprayed and its periphery with a burner or the like to promote the evaporation of moisture.

  Moreover, although the case where the rock salt layer is formed by spraying concentrated salt water on a normal wall surface has been described in the first embodiment, the wall surface may be provided with unevenness.

  FIG. 4A is a front view and a side view of the wall 68 in the case where the convex portions 74A and the concave portions 74B are provided in a net shape on the surface of the wall 68 on the side on which the rock salt layer is formed, and FIG. It is the front view and side view of the wall 68 at the time of providing the convex part 74A and the recessed part 74B in the grid | lattice form on the surface at the side which forms the rock salt layer of the wall 68. FIG. In this way, by finishing the surface of the wall 68 into an uneven shape, or by attaching a net or net to the wall surface, concentrated salt water stays on the convex portion, and the water of the retained concentrated salt water evaporates. Since crystals precipitate, formation of a rock salt layer can be promoted.

[Second Embodiment]
Although the form shown by the said 1st Embodiment was a form in the case of constructing a rock salt room directly using the concentrated salt water produced | generated by the concentrated salt water production | generation apparatus 10 (henceforth a direct construction method), this 2nd In the embodiment, when a plurality of salt panels having a fixed size and having a salt layer formed on the surface are manufactured by precast in a factory, and the manufactured salt panel 76 is attached to the wall 68 of the salt room, as shown in FIG. Embodiments will be described.

  First, with reference to FIG. 6, the concentrated salt water production | generation apparatus 10 which concerns on this 2nd Embodiment, the factory 55 which manufactures the rock salt panel 76, and the periphery structure are demonstrated. 6 that are the same as those shown in FIG. 2 are assigned the same reference numerals, and descriptions thereof are omitted.

  As shown in FIG. 6, the form according to the second embodiment is a factory 55 in which a salt room 54 is provided with a plurality of panel bases 66 in the first embodiment shown in FIG. 2. Only the difference is.

  In the above configuration, the builder sprays concentrated salt water having a salt concentration of about 18% stored in the evaporation tank 42 on the surface of the panel base 66 with the sprayer 52. Concentrated salt water sprayed on the surface of the panel base 66 flows down the surface of the panel base 66, and salt crystals precipitated during the flow down adhere to the surface of the panel base 66. On the other hand, the concentrated salt water that has flowed down to the floor of the factory 55 flows into the storage tank 58 through the drainage channel 56.

  Thereafter, the control panel 32 operates the water intake pump 60 to take in the concentrated salt water stored in the storage tank 58, and after passing through the filtration device 62, the control panel 32 flows out into the evaporation tank 42. Thus, the concentrated salt water that has flowed into the evaporation tank 42 is pressurized again by the pressure pump 50 and sprayed onto the surface of the panel substrate 66 in the factory 55.

  The concentrated salt water stored in the evaporation tank 42 is sprayed on the surface of the panel base 66, flows into the storage tank 58 via the drainage channel 56 of the concentrated salt water flowing down to the floor of the factory 55, and the storage tank 58 by the intake pump 60. The concentrated salt water is concentrated by evaporating water while repeating a series of operations of taking the concentrated salt water stored in the tank and flowing out to the evaporation tank 42 through the filtering device 62. Accordingly, since salt crystals are deposited on the surface of the panel base 66 in the factory 55 and in the storage tank 58 and the amount of water gradually decreases, the level of the concentrated salt water stored in the storage tank 58 is measured by the level meter 59. Then, when the measured value falls below a certain value, the operation of the pressure pump 50 and the water intake pump 60 is stopped, and the above-described water intake of the seawater 90 to the concentrated salt water tank 24 is again concentrated and evaporated by the membrane distillation membrane module 18. By performing concentration in the tank 42, the spraying operation on the panel base 66 in the factory 55 is resumed when concentrated salt water having a salt concentration of about 18% is sufficiently accumulated in the evaporation tank 42.

  By repeating the above operation, the rock salt panel 76 having a rock salt layer formed on the surface can be manufactured.

  Next, a procedure for attaching the salt panel 76 manufactured as described above to the wall 68 of the salt room 54 will be described with reference to FIG.

  As shown in the figure, the trunk edge 84 is first installed on the wall 68 of the salt room 54, and the salt panel 76 is fixed to the trunk edge 84 with screws 86 through the screw holes provided at the four corners of the salt panel 76.

  Next, the head portion of the screw 86 is filled with a material 88 such as white putty or clay, and a gap between the rock salt panels 76 is caulked with a white caulking material 89.

  Finally, the salt salt layer 64B is formed by spraying concentrated salt water on the surface (exposed surface) of the material 88 and the caulking material 89 by spraying or the like, and is integrated with the surrounding salt salt layer 64.

  As described above, in the concentrated salt water generation apparatus 10 according to the second embodiment, the seawater 90 is supplied until the salinity concentration reaches about 15% by the membrane distillation method that does not require a relatively large amount of heat, as in the first embodiment. Because it is concentrated, the rock salt room can be constructed with less energy consumption compared to the case of using the ion exchange membrane method, and the site area for installing the facilities compared to the case of using the salt field is reduced. Can be narrowed.

  Further, in the salt room construction method according to the second embodiment, the salt panel 76 is manufactured by precasting and then attached to the wall surface of the salt room 54. Therefore, the concentrated salt water generating device 10 is located near the construction place of the salt room 54. It is not necessary to install a rock salt room construction facility including the above, and the degree of freedom of the construction place of the salt room 54 can be increased.

  In addition, in this 2nd Embodiment, although the case where an operator performed operation which sprays concentrated salt water on the panel base 66 installed in the factory 55 was demonstrated, spraying concentrated salt water on the panel base 66 in the factory 55 Any form can be used as long as it can be performed, for example, a form shown in FIG.

  As shown in the figure, in this embodiment, a sprinkling pipe 70 provided with a plurality of outlets at regular intervals is provided in the vicinity of the ceiling surface in the factory 55, and the outlet of the pressure pump 50 is used as the sprinkling pipe 70. And a plurality of panel bases 66 are installed on the wall surface in the factory 55. In this case, it is possible to automatically spray concentrated salt water on the panel base 66 in the factory 55 without flowing through the builder by simply driving the pressure pump 50 and the water intake pump 60, or to flow like a shower. Labor costs can be reduced.

  Moreover, in this 2nd Embodiment, although the case where the rock salt panel 76 was manufactured by spraying concentrated salt water with respect to the panel base 66 installed in the factory 55 in a normal environment was demonstrated, By performing dehumidification inside the factory 55, heating of the air in the factory 55, etc., the inside of the factory 55 is made a dry environment, so that the rock salt layer on the surface of the panel base 66 can be formed more quickly. Also, the rock salt layer on the surface of the panel base 66 can be formed more quickly by heating the panel base 66 sprayed with concentrated salt water with a burner or the like to promote the evaporation of moisture.

  In the second embodiment, the case where the rock salt layer is formed by spraying concentrated salt water onto the panel base 66 having a smooth surface has been described. However, the surface of the panel base 66 may be provided with unevenness. In this case, the concentrated salt water flowing down stays in the convex portion, and the water of the retained concentrated salt water evaporates to precipitate crystals, so that formation of a rock salt layer can be promoted.

[Third Embodiment]
In the second embodiment, the rock salt layer is formed by spraying concentrated salt water on the surface of the panel base 66 installed in the factory 55. However, the third embodiment is shown in FIG. As described above, the rock salt layer is formed by immersing the panel base 66 in the water tank 78 storing the concentrated salt water generated in the concentrated salt water tank 24 (see also FIG. 6) or the evaporation tank 42 in the second embodiment for a long time. Is.

  Therefore, in this case, equipment downstream of the evaporation tank 42 in the concentrated salt water generation apparatus 10, that is, the pressure pump 50, the sprayer 52, the factory 55, the storage tank 58, the intake pump 60, and the filtration device 62 need to be installed. Absent.

  As described above, by immersing the panel base 66 in concentrated salt water, salt crystals are deposited on the surface of the panel base 66 over time, so that the panel base 66 is removed from the water tank 78 at a sufficiently deposited stage. The rock salt panel 76 can be manufactured by taking out and drying.

  As described above, in the rock salt room construction method according to the third embodiment, since the equipment downstream from the evaporation tank 42 is not required, the rock salt room construction equipment can be configured at low cost.

[Fourth Embodiment]
In the fourth embodiment, as shown in FIG. 9B, first, a base material 82 such as an iron plate or an iron net is immersed in a water tank 78 in which seawater 90 is stored, and this is used as a cathode and ferrite. An electrode 80 such as the above is immersed into an anode, and a weak current is passed between the cathode and the anode. Thereby, positive ions such as calcium and magnesium in the seawater 90 adhere to the surface of the base material 82 and are laminated (referred to as an electrodeposition method).

Next, a rock salt layer is formed on the surface of the base material 82 using the base material 82 to which positive ions are attached as the panel base 66 according to the configuration and procedure shown in the second embodiment.
Thus, in the rock salt room construction method according to the fourth embodiment, since the base material 82 on which positive ions such as calcium and magnesium are attached and fine irregularities are formed on the surface is used as the panel base 66, Formation of the surface rock salt layer can be promoted.

  In each of the above embodiments, the case where the production of concentrated salt water in the concentrated salt water tank 24 is stopped when the salt concentration detected by the sensor 30 reaches 15% has been described, but the present invention is not limited to this. The salinity of the concentrated salt water stored in the concentrated salt water tank 24 is 15 based on the concentration of the intake seawater (about 3.5%), the upper limit water level of the concentrated salt water tank 24, the dimensions of the concentrated salt water tank 24, etc. It is also possible to calculate the target water level in the case of% and to stop the production of concentrated salt water in the concentrated salt water tank 24 when the water level detected by the level meter 28 reaches the target water level.

  Moreover, although each said embodiment demonstrated the case where the production | generation of the concentrated salt water in the evaporation tank 42 was stopped when the salt concentration detected by the sensor 48 became 18%, this invention is limited to this. The salinity of concentrated salt water stored in the evaporating tank 42 based on the concentration of concentrated salt water initially stored in the evaporating tank 42 (about 15%), the upper limit water level of the evaporating tank 42, the dimensions of the evaporating tank 42, etc. A target water level when the concentration reaches 18% is calculated in advance, and when the water level detected by the level meter 46 reaches the target water level, the generation of concentrated salt water in the evaporation tank 42 is stopped. Good.

  Moreover, in the said 1st Embodiment, the case where the salt room 54 is constructed by a direct construction method is demonstrated, In the said 2nd thru | or 4th embodiment, after producing the salt panel 76 by precast, it attaches in the salt room 54 Although the case has been described, these embodiments may be combined and applied.

  In this case, for example, when constructing a salt room with a substantially hemispherical shape (so-called dome shape) and a horizontal ceiling surface provided at the center of the ceiling, a salt panel made by precast is attached to the horizontal ceiling surface. Effective rock salt that forms a salt layer on the ceiling surface and the entire wall surface by forming a salt layer on the wall surface that is curved from the outer periphery of the horizontal ceiling surface toward the floor surface by the direct construction method The room can be constructed easily.

  Moreover, after constructing the rock salt room 54 as shown in the first to fourth embodiments, as shown in FIG. 10, the concentrated salt water generating device 10 is left as it is, and the sprayer 52 is made finer. By changing to a nozzle 53 capable of spraying particles and adjusting the degree of concentration of seawater 90, sea salt particles 91 having various salt concentrations can be sprayed in the salt room 54 in the form of a mist. 54 can be used as a facility for filling the inside 54 with negative ions by the sea salt particles 91.

  Moreover, the concentrated salt water production | generation apparatus of this invention can be utilized also as a means to manufacture natural salt from seawater.

It is the schematic used for description of the structure and principle of the membrane distillation method which concerns on each embodiment. It is a block diagram which shows schematic structure of the concentrated salt water production | generation apparatus which concerns on 1st Embodiment, a rock salt room, and its periphery. It is the schematic which shows the modification of the internal structure of the rock salt room in 1st Embodiment. It is a figure which shows the state which provided the unevenness | corrugation in the wall surface in the rock salt room in 1st Embodiment, (A) is the front view and side view at the time of providing a net-like unevenness, (B) provides a grid | lattice-like unevenness | corrugation It is the front view and side view in the case of being. It is the fracture | rupture side view which showed the state attached to a wall surface, after manufacturing a rock salt panel by precast. It is a block diagram which shows schematic structure of the concentrated salt water production | generation apparatus which concerns on 2nd Embodiment, a factory, and its periphery. It is a fracture | rupture side view which shows the procedure at the time of attaching the rock salt panel manufactured by the precast in 2nd Embodiment to a wall. It is the schematic which shows the modification of the internal structure of the factory in 2nd Embodiment. (A) is the schematic which shows the manufacture procedure of the rock salt panel in 3rd Embodiment, (B) is the schematic which shows the manufacture procedure of the rock salt panel in 4th Embodiment. It is a block diagram used for description of the utilization form of the rock salt room construction equipment after rock salt room construction. It is a block diagram which shows the procedure of the sun salt field method which can be applied as a technique for producing | generating the conventional concentrated salt water, the Shioda-Sengo method, and the ion exchange membrane method. It is the schematic which shows the structural example of the part which performs electrodialysis at the time of implementing an ion exchange membrane method.

Explanation of symbols

10 Concentrated salt water generating device 18 Membrane distillation membrane module (first concentrated salt water generating means)
24 Concentrated salt water tank (first tank)
32 Control panel 40 Heat source (first heating means)
42 Evaporation tank (second tank)
44 Heat source (second heating means)
52 Spray gun 54 Rock salt room 55 Factory 58 Reservoir 64 Rock salt layer 66 Panel base (plate member)
68 Wall 70 Sprinkling pipe 76 Rock salt panel 78 Water tank 82 Base material (plate member)
90 Seawater 92 Membrane 99 Concentrated salt water

Claims (5)

A first tank storing seawater;
First heating means for heating seawater stored in the first tank;
The seawater heated by the first heating means is provided with a first passage through which warm seawater disposed and a second passage through which cold seawater passes is disposed across a membrane provided therein. The first concentrated salt water is extracted by extracting only fresh water from the heated seawater when unsealed seawater is circulated between the tank and the first passage and is not heated in the second passage. First concentrated salt water generating means for generating
A second tank for storing the first concentrated salt water generated by the first concentrated salt water generating means;
A second concentrated salt water is obtained by increasing the salinity concentration of the first concentrated salt water stored in the second tank by heating the first concentrated salt water stored in the second tank. Heating means,
Concentrated salt water generating device. The circulation of seawater heated by the first heating means is controlled between the first tank and the first passage, and the salinity of seawater stored in the first tank is set to a predetermined concentration. The concentrated salt water generation device according to claim 1, further comprising control means for controlling to stop the circulation between the first tank and the first passage when the first tank is reached.   The control means calculates a water level when the salt concentration of the seawater stored in the first tank reaches the predetermined concentration based on the salt concentration of the raw water of the seawater and the dimensions of the first tank. When the water level of the first tank reaches the calculated water level, it is determined that the salinity of the seawater stored in the first tank has reached the predetermined concentration, and the circulation is stopped. The concentrated salt water production | generation apparatus of Claim 2 controlled to.   The control means controls the heating operation by the second heating means for the first concentrated salt water stored in the second tank and the first concentrated salt water stored in the second tank. The concentrated salt water production | generation apparatus of Claim 2 or Claim 3 which controls so that the said heating operation | movement is stopped when salt concentration reaches the 2nd predetermined density | concentration.   The control means is configured to control the first concentrated salt water stored in the second tank based on the salinity concentration of the first concentrated salt water stored in the second tank and the dimensions of the second tank. The water level when the salinity concentration reaches the second predetermined concentration is calculated, and the first level stored in the second tank when the water level of the second tank reaches the calculated water level. The concentrated salt water generation device according to claim 4, wherein the heating operation is stopped when it is determined that the salt concentration of the concentrated salt water has reached the second predetermined concentration.

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