JP4601396B2 - Method and system for removing water containing solid using liquefied substance - Google Patents

Description

  The present invention relates to a method and system for removing solid-containing water using a liquefied substance. More specifically, the present invention relates to a method and system for dehydrating a water-containing solid at an operating temperature close to the outside temperature.

  Patent Document 1 discloses a method and system for removing moisture contained in a solid to be treated such as coal using a substance D that becomes a gas under normal temperature and normal pressure such as dimethyl ether. As shown in FIG. 7, the system of Patent Document 1 includes compressors 101 and 101 ′ for pressurizing dimethyl ether vapor, a condenser 102 for liquefying pressurized dimethyl ether vapor, and liquefied dimethyl ether. The dehydrator 103 removes the water contained in the coal by dissolving the water in the coal into the liquefied dimethyl ether by contacting the coal with the solid to be treated, and only dimethyl ether from the liquefied dimethyl ether containing water by the dehydration. An evaporator 104 that selectively evaporates, a separator 106 that separates dimethyl ether vapor and water, and an expander 107 that adiabatically expands the dimethyl ether vapor separated from water by the separator 106 are arranged in the above order by piping. Are connected in series, and the expander 107 is further connected to the first compressor 101. Circulation path (closed circuit) is formed. Through this circulation path, dimethyl ether circulates while changing the state of gas and liquid, so that dehydration and separation of water are repeated.

  The condenser 102 and the evaporator 104 are connected by a heat exchanger 105. The temperature and pressure when vaporizing the liquefied dimethyl ether by the evaporator 104 are adjusted by a cooler 104 ′ and a pressure reducing valve 104 ″. The separator 106 is dissolved in water separated from dimethyl ether vapor. A degassing tower 108 for degassing dimethyl ether is connected to the degassing tower 108. The pressure inside the degassing tower is lowered by a pressure holding valve 108 'to vaporize and recover the dimethyl ether. The tower 108 is connected to the above-mentioned circulation path by a pipe (not shown), and the recovered dimethyl ether is returned to the circulation path again. Is used as a part of the power of the first compressor 101 that pressurizes dimethyl ether. Performed only for 2 compressor 101 '. Condenser 110 is for adjusting the gas temperature exiting the expander 107 to the optimum temperature of the inlet of the first compressor 101.

PCT / JP03 / 068989 (International Publication Number WO 03/101579)

  However, in the dehydration method and system disclosed in Patent Document 1, since the substance D (for example, dimethyl ether) circulates in only one circulation path, when the substance D flows through this circulation path, the heat exchanger 105 and the dehydrator The flow rate of the substance D may decrease due to the pressure loss inside 103. Further, it is conceivable that the processing speed of the compressors 101 and 101 ′ and the pressure and temperature at the outlets of the compressors 101 and 101 ′ change due to various external factors. The flow rate, pressure, and temperature of the substance D in 105, the dehydrator 103, the separator 106, and the expander 107 also change in a chain. Since the substance D returns to the compressors 101 and 101 ′ again through the circulation path, the flow rate, pressure, and temperature of the substance D at the inlets of the compressors 101 and 101 ′ also change. For this reason, there is a risk that changes in the flow rate, pressure, and temperature of the substance D are amplified each time the substance D goes through the circulation path. In order to avoid this danger and to operate the system stably, it is necessary to have a mechanism to measure the flow rate, pressure, and temperature of substance D at many points in the circuit and to control these physical properties at a constant level. It becomes. Such a mechanism complicates the system and increases costs.

  In the dehydration method and system disclosed in Patent Document 1, it is necessary to match the flow rate of the substance D at the outlet of the compressor 101 ′ with the flow rate of the substance D at the inlet of the dehydrator 103. This adjustment is generally difficult because the output of existing compressors is often fixed. In addition, the compressor 101 ′ uses the vapor of the substance D as a processing target, whereas the processing target of the dehydrator 103 is the liquid of the substance D, and the volume ratio of the gas and the liquid of the substance D is usually several hundreds. Therefore, it is extremely difficult to match the processing amount of the substance D between the compressor 101 ′ and the dehydrator 103. Further, when the flow rate of the substance D at the outlet of the compressor 101 ′ under the operating condition where the required power is mechanically lowest and the flow rate of the substance D to the dehydrator 103 chemically suitable for dehydration are different, the compressor It is impossible to optimize the efficiency of both the 101 ′ and the dehydrator 103, and one of the efficiency must be sacrificed. For this reason, in the technique of Patent Document 1, it is impossible to optimize the entire system.

  Therefore, the present invention makes it easy to control the flow rate of the working substance used for dehydration, and the solid-containing moisture using a liquefied substance that can independently set operating conditions for improving the performance of system components such as a compressor and a dehydrator. It is an object of the present invention to provide a method and system for removing the above.

  In order to achieve this object, the solid content moisture removing system using the liquefied substance according to claim 1 is characterized in that the substance which is a gas at 25 ° C. and 1 atm is used as a working substance, and the gas of the working substance is pressurized, or The liquefaction means for liquefying by cooling or a combination of pressurization and cooling, a storage tank for storing the liquefied working substance, and taking out the working substance containing moisture from the storage tank and vaporizing the working substance. The gas of the working substance and the water separating means for separating the water are connected in series, and the working substance vaporized by the water separating means is connected by the water separating means and the liquefying means again by the liquefying means. A first circulation path to be liquefied is formed, and the working substance liquefied from the storage tank and the storage tank is taken out and the working substance is brought into contact with a moisture-containing solid. The dehydrating means for dehydrating by dissolving the components is connected in series, and the working substance containing water discharged from the dehydrating means is returned to the storage tank by connecting the dehydrating means and the storage tank. A second circuit is formed so that the system of the first and second circuits can be operated simultaneously or separately.

  The method for removing moisture containing solids using the liquefied substance according to claim 9 is a method in which a substance that is a gas at 25 ° C. and 1 atm is used as a working substance, and the gas of the working substance is pressurized, cooled, or pressurized. And liquefying means for liquefying by the combined use of cooling, a storage tank for storing the liquefied working substance, a gas of the working substance by taking out the working substance containing moisture from the storage tank and vaporizing the working substance A first circulation in which water separation means for separating water is connected in series, and the working substance vaporized by the water separation means is liquefied again by the liquefaction means by connecting the water separation means and the liquefaction means. A dehydrating means for forming a path, taking out the working substance liquefied from the storing tank and bringing the working substance into contact with a moisture-containing solid to dissolve the moisture to perform dehydration; A second circulation path connected in series and connecting the dehydrating means and the storage tank to return the working substance containing moisture discharged from the dehydrating means to the storage tank; and Water is removed from the contents of the storage tank by circulating in the first circulation path, water is removed from the water-containing solid by circulating the working substance in the second circulation path, and the first The first and second circuit systems are operated simultaneously or separately.

  Therefore, the system of the first circuit and the system of the second circuit are independent of each other, and each system can be operated separately, so that the liquefaction belonging to the system of the first circuit It is not necessary to match the processing amount of the means and the dehydrating means belonging to the system of the second circulation path, and the optimum operating conditions in which the liquefying means and the dehydrating means can each exhibit the highest efficiency and performance are independently determined in the system. It becomes possible to set.

  The invention according to claim 2 is the solid content moisture removal system using the liquefied substance according to claim 1, wherein the working substance is one substance selected from dimethyl ether, ethyl methyl ether, formaldehyde, ketene, and acetaldehyde. Or it shall be the mixture of these 2 or more types. These substances are gases at 25 ° C. and 1 atm, and can be used as working substances according to the present invention.

  The invention described in claim 3 is the solid content moisture removal system using the liquefied substance according to claim 1 or 2, wherein the dehydrating means countercurrently liquefies the working substance and the moisture-containing solid. It is supposed to contact. In this case, dehydration can be performed with high efficiency using a small amount of dimethyl ether.

  According to a fourth aspect of the present invention, there is provided the solid-containing moisture removal system using the liquefied substance according to the third aspect, wherein the dehydrating means includes a casing, a rotating shaft disposed at the axial center of the casing, A rotor having a plurality of rotating cell portions that rotate within the casing via a rotating shaft; and a rotation driving mechanism that rotates the rotor by the rotating shaft, and the moisture-containing solid is charged into the rotating cell portion. In addition, the working substance is supplied and the working substance and the water-containing solid are brought into contact with each other in the rotating cell part while the rotor is rotated by the rotation driving mechanism, and the working substance after the contact is brought into contact with the rotating cell part. A dehydrating device that re-feeds to another rotating cell portion in a direction opposite to the rotating direction of the liquid, and a liquid feed pump that sends the working substance from the storage tank to the dehydrating device. To have. In this case, since the liquid working material moves in the direction opposite to the rotation direction of the rotating cell portion into which the moisture-containing solid is charged, the moisture-containing solid and the working material can be brought into countercurrent contact.

  The invention described in claim 5 is the solid content moisture removal system using the liquefied substance according to any one of claims 1 to 4, wherein the internal space of the storage tank is sent from the liquefying means. A liquid chamber for dehydration into which the liquefied product of the working substance flows in and the liquefied product flows out toward the dehydrating means, and a liquefied product of the working substance containing moisture sent from the dehydrating means flows in and A partition wall is provided to separate the liquefied material from the regenerating liquid chamber from which the liquefied material flows out toward the water separating means. In this case, the liquefied product of the high-purity working substance sent from the liquefying means and the liquefied product of the working substance containing a lot of water sent from the dehydrating means can be configured not to be easily mixed.

  Further, the invention according to claim 6 is the solid content moisture removing system using the liquefied substance according to claim 5, wherein the partition wall is provided between the dehydrating liquid chamber and the regenerating liquid chamber. The liquefied product is configured to be movable. In this case, even when the processing speeds of the first circulation path system and the second circulation path system are greatly different or when these systems are operated separately, the regeneration liquid chamber or the dehydration liquid chamber is not provided. You can avoid the situation of becoming empty.

  Further, the invention according to claim 7 is the solid content moisture removal system using the liquefied substance according to any one of claims 1 to 6, wherein the water separation means is separated by the water separation means. A degassing tower for degassing the working substance contained in the water is connected; the degassing tower is connected to the first circulation path; and the degassed working substance is recovered and the first It is assumed that it is returned to 1 circulation path. In this case, it is possible to prevent discharge of water in which the working substance is dissolved, to minimize the load on the environment, and to minimize the amount of loss of the working substance.

  The invention described in claim 8 is a solid content moisture removal system using the liquefied substance according to any one of claims 1 to 7, wherein the flow path connecting the dehydrating means and the water separating means. The working substance remaining in the dehydrating means is extracted to the water separating means side through the flow path. In this case, when the solid after the dehydrating operation is taken out from the dehydrating means, it is possible to avoid the working substance remaining in the dehydrating means from rapidly expanding under atmospheric pressure.

  Thus, according to the moisture removal system according to claim 1 and the moisture removal method according to claim 9, the system of the first circuit and the system of the second circuit are independent of each other. Since it is possible to operate separately, it is not necessary to match the processing amounts of the liquefaction means belonging to the first circulation path system and the dehydration means belonging to the second circulation path system. It is possible to independently set the optimum operating conditions in which each system can exhibit the highest efficiency and performance.

  In addition, by making it possible to set optimum operating conditions independently in each system, the flow rate, pressure, and temperature of substances in the circulation path are measured at many locations in the circulation path, and these physical property values are obtained. It does not require a mechanism for constant control, prevents the moisture removal system from becoming complicated, and reduces equipment costs.

  Furthermore, the substances listed in claim 2 are gases at 25 ° C. and 1 atm, and can be used as working substances according to the present invention.

  Furthermore, according to the moisture removal system of claims 3 and 4, dehydration can be performed with high efficiency using a small amount of dimethyl ether by bringing the liquefied product of the working substance and the moisture-containing solid into countercurrent contact.

  Furthermore, according to the water removal system of claim 5, by providing a partition wall that partitions the internal space of the storage tank, a high-purity working substance liquefied material sent from the liquefying means and a large amount of water sent from the dehydrating means The liquefied product of the working substance containing can be configured not to be easily mixed. Thereby, the dehydrating means can efficiently perform the dehydrating process using the working substance containing almost no water, and the water separating means can effectively perform gas-liquid separation on the working substance containing a lot of water. it can.

  Furthermore, according to the water removal system of the sixth aspect, since the partition wall is configured so that the liquefied product of the working substance can move between the dehydrating liquid chamber and the regenerating liquid chamber, the first circulation path Even when the processing speeds of the system and the system of the second circulation path are greatly different or when these systems are operated separately, it is possible to avoid a situation where the regeneration liquid chamber or the dehydration liquid chamber becomes empty.

  Furthermore, according to the water removal system of claim 7, since the degassing tower for degassing the working substance contained in the water separated by the water separation means is provided, it is possible to prevent the water in which the working substance is dissolved from being discharged. This minimizes the load on the environment and minimizes the amount of loss of working substances.

  Furthermore, according to the water removal system according to claim 8, when the solid after the dehydration operation is taken out from the dehydration means, it is possible to prevent the working substance remaining in the dehydration means from rapidly expanding under atmospheric pressure. .

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  FIG. 1 to FIG. 5 show an embodiment of a solid content moisture removing method and system using the liquefied substance of the present invention. This moisture removal system 1 is liquefied with a liquefying means 2 for liquefying a gas which is a gas at 25 ° C. and 1 atm using a gas as a working material under pressure, cooling, or a combination of pressure and cooling. The storage tank 3 for storing the working substance and the water separation means 4 for separating the working substance gas and the water by taking out the working substance containing moisture from the storage tank 3 and vaporizing the working substance are connected in series. In addition, the water separation means 4 and the liquefaction means 2 are connected to form a first circulation path C1 in which the working substance vaporized by the water separation means 4 is liquefied again by the liquefaction means 2, and the storage tank 3 and the storage tank The dehydrating means 5 for removing the liquefied working substance from 3 and bringing the working substance into contact with a moisture-containing solid to dissolve the moisture and dehydrating is connected in series, and the dehydrating means 5 and the storage tank 3 are connected. Thus, a second circulation path C2 is formed in which the working substance containing moisture discharged from the dehydrating means 5 is returned to the storage tank 3, and the systems 6 and 7 of the first and second circulation paths C1 and C2 are simultaneously or separately formed. To be able to work.

  In the present invention, as a working substance for removing moisture from a moisture-containing solid, a substance obtained by liquefying a substance that is a gas at around normal temperature and under atmospheric pressure (specifically, at 25 ° C. and 1 atm) is used. In the present invention, the solubility of water is remarkably changed by utilizing the gas-liquid phase transition phenomenon of the working substance. After dissolving the water in the moisture-containing solid in the liquefied working substance, the temperature and pressure are slightly changed to selectively evaporate only the working substance and easily separate the water and working substance gases. The Therefore, the working substance used in the present invention is preferably a substance having a high mutual solubility with water and a high mutual solubility with water in a liquefied state. Also, if the boiling point of the working substance is higher than room temperature, a high-temperature energy source is required to evaporate the working substance when it is separated from water, and it is expected that the energy required for dehydration will increase. In order to enable dehydration with a small amount of required energy, the boiling point of the solvent is preferably near normal temperature or lower. Therefore, in the present invention, a substance that is a gas at 25 ° C. and 1 atm is liquefied and used. Further preferred are substances that are gaseous at 0 ° C. and 1 atm. Examples of substances that are gases at 25 ° C. and 1 atm include dimethyl ether, ethyl methyl ether, formaldehyde, ketene, and acetaldehyde. These may be used alone or in combination of two or more. Among them, dimethyl ether that is easy to handle without toxicity is preferable. In addition, as a substance that is a gas at 25 ° C. and 1 atm, butane and propane are also included. These are not capable of dissolving water alone, but can be mixed with one or a mixture of two or more selected from dimethyl ether, ethyl methyl ether, formaldehyde, ketene, acetaldehyde and the like. Since butane and propane are components such as natural gas, they can be easily obtained, and can be easily liquefied with a boiling point close to that of liquefied dimethyl ether. In addition, even when mixed with liquefied dimethyl ether or the like, the dehydrating performance is slightly lowered, and a sufficiently superior performance can be obtained as compared with existing methods, so that the amount of liquefied dimethyl ether or the like can be reduced.

  For example, in this embodiment, an example in which dimethyl ether (also expressed as DME) is used as the working substance will be described. However, the working substance according to the present invention is not limited to this. Dimethyl ether has a boiling point of approximately −25 ° C. at 1 atmosphere and is in a gaseous state at atmospheric pressure of 0 ° C. to 50 ° C. Thus, since it is in a gaseous state near room temperature and under atmospheric pressure, an operation under pressure is necessary to obtain dimethyl ether in a liquid state. Further, a highly efficient method and apparatus for producing dimethyl ether are disclosed in, for example, JP-A-11-130714, JP-A-10-19509, JP-A-10-195008, JP-A-10-182535 to JP-A-10-182527, JP-A 09-309852 to JP-A 09-309850, JP-A 09-286754, JP-A 09-173863, JP-A 09-173848, JP-A 09-173845, etc. Obtainable.

  For example, this embodiment demonstrates the case where coal is dehydrated as a water-containing solid. According to the present invention, moisture in coal that is strongly bonded to functional groups on the coal surface can be removed with low power from lignite or subbituminous coal, and dehydrated to the same moisture content as bituminous coal. Although lignite and subbituminous coal are low ash and low sulfur coal types, they contain a large amount of moisture, so transportation costs and combustibility deteriorate, and they have not been used anywhere except in the mountains. By using it, it becomes possible to realize combustion performance and transportation cost comparable to high-grade coal. This is extremely effective in reducing power generation costs when comprehensively judging from coal mining to processing after power generation. Of course, the present invention can be applied to removing moisture from any solid other than coal.

  The liquefying means 2 of this embodiment is, for example, a compressor that compresses a working substance gas (dimethyl ether gas). Hereinafter, it is referred to as a compressor 2. The compressor 2 is driven by an electric motor 8, for example. Dimethyl ether gas is pressurized by the compressor 2 to become superheated gas, and then condenses inside the storage tank 3 to become a liquefied product. In addition, what can be condensed inside the storage tank 3 is that the amount of liquefied dimethyl ether already existing inside the storage tank 3 is sufficiently increased with respect to the amount of superheated gas of dimethyl ether flowing into the storage tank 3. This is because the latent heat of evaporation released by dimethyl ether can be absorbed by the temperature rise inside the storage tank 3. However, as shown in FIG. 6, a cooler 9 is disposed between the compressor 2b and the storage tank 3, and the superheated gas of dimethyl ether is reliably condensed and liquefied by the cooler 9 immediately before the storage tank 3. You may do it. Further, as shown in the figure, the compressor may have a multistage configuration. In the case of FIG. 6, the liquefying means 2 is constituted by the compressors 2 a and 2 b and the cooler 9.

  The water separation means 4 of this embodiment includes a pressure reducing valve 10 for extracting liquefied dimethyl ether containing water from the inside of the storage tank 3, an evaporator 11 for vaporizing dimethyl ether from a liquefied dimethyl ether in which water is dissolved, and dimethyl ether vapor. And a separator 12 for separating water and water. By adopting such a configuration, even when the separation performance of the substance D and water by the separator 12 (symptom of the substance D at the outlet of the separator 12) is changed due to disturbance, for example, the separator 12 stores the liquefying means 2 and the reservoir. Since only the tank 3 and the evaporator 11 are connected, it is possible to extremely reduce the influence of the change in the separation performance on other devices. Furthermore, since the sufficient substance D exists in the storage tank 3, it becomes possible to make the change in the property of the substance D flowing into the separator 12 extremely small. For this reason, it is possible to return the separation performance to a predetermined value by changing the output of the evaporator 11 and changing the amount of heat input to the separator 12. The liquefied dimethyl ether supplied to the evaporator 11 evaporates only the dimethyl ether component selectively in the evaporator 11, and the water dissolved in the dimethyl ether remains in a liquid state without evaporating. Dimethyl ether gas and water are separated into gas and liquid by the separator 12.

  Here, since there is a possibility that water droplets are mixed in the dimethyl ether gas separated by the separator 12, in this embodiment, the separation is performed in order to remove the water droplets mixed in the dimethyl ether gas. A water trap 13 is provided after the vessel 12. For example, a demister that removes moisture in the steam by passing the steam through the overlapped mesh can be used as the water trap 13. The water collected by the water trap 13 is returned to the separator 12. The water separated by the separator 12 is discharged by opening the valve 50. Here, when the pressure inside the separator 12 is higher than the atmospheric pressure, dimethyl ether gas is dissolved in the water separated by the separator 12. If this water is discharged as it is, the load on the environment is large, and the loss of dimethyl ether is further increased. Therefore, in order to minimize the load on the environment and the loss of dimethyl ether, a deaeration tower 14 for recovering dimethyl ether dissolved in the waste water is connected to the separator 12 as shown in FIG. Also good. The deaeration tower 14 is provided with a pressure holding valve 15 at its inlet, and is configured to recover dimethyl ether by lowering the pressure inside the deaeration tower 14. Furthermore, the recovery rate of dimethyl ether can also be improved by heating water with the heating can 14a provided in the lower part of the deaeration tower 14. FIG. The dimethyl ether vapor separated from the waste water by the deaeration tower 14 is returned to the first circulation path C1 of the moisture removal system 1 through a pipe (not shown) and used.

  The dehydrating means 5 of the present embodiment includes a dehydrating device 16 and a liquid feed pump 17 that sends a working substance from the storage tank 3 to the dehydrating device 16. By adopting such a configuration, for example, even when the dewatering performance (the property of the substance D (for example, dimethyl ether) at the outlet of the dewatering device 16) in the dewatering device 16 is changed due to disturbance, the dewatering device 16 is connected to the liquid feed pump 17. Since only the storage tank 3 is connected, the influence of the change in the dewatering performance on other devices can be extremely reduced. Furthermore, since the sufficient substance D exists in the storage tank 3, it becomes possible to make the change in the property of the substance D flowing into the liquid feed pump 17 extremely small. For this reason, it becomes possible to return the dehydration performance to a predetermined value by changing the output of the liquid feed pump 17 and changing the amount of the substance D flowing into the dehydrator 16.

  The dehydrator 16 is not particularly limited as long as it has a configuration in which coal as a moisture-containing solid is brought into contact with a liquefied product of dimethyl ether as a working substance, but a small amount of dimethyl ether is used. From the viewpoint of highly efficient dehydration, a counter-current contact type is preferable. As such a counter-current contact type dehydrator 16, it is desirable to use a funnel cell extractor disclosed in, for example, Japanese Patent Publication No. 57-15922 and Japanese Patent Application Laid-Open No. 2004-255248.

  A configuration example of the dehydrating device 16 using the principle of the funnel cell extractor is shown in FIGS. The dehydrating device 16 includes a casing 18, a rotating shaft 19 disposed at the axis of the casing 18, a rotor 21 having a plurality of rotating cell portions 20 that rotate within the casing 18 via the rotating shaft 19, and a rotor 21. A rotary drive mechanism 22 that rotates the rotary cell 19 by rotating the rotary shaft 19. The rotary cell portion 20 is rotated while the rotor 21 is rotated by the rotary drive mechanism 22. The working substance and the water-containing solid are brought into contact with each other in 20, and the working substance after the contact is re-supplied to another rotating cell unit 20 in the direction opposite to the rotating direction of the rotating cell unit 20. The working substance containing moisture and the solid to be dehydrated from which moisture has been removed (coal in this embodiment) are collected separately.

  The casing 18 has a cylindrical side wall 18A, an upper plate 18B that seals the upper surface of the side wall 18A, and faces the upper plate 18B and is inclined downward from the center of the cylindrical side wall 18A toward the side wall 18A. It has a bottom plate 18C and has a sealed structure. The rotor 21 includes an inner cylinder 21B that surrounds the rotary shaft 19 and is connected to the rotary shaft 19 by upper and lower connecting members 21A, and a cylindrical inner wall 21C that surrounds the inner cylinder 21B and has a smaller diameter than the side wall 18A. A ring-shaped space formed between the inner wall 21C and the inner cylinder 21B, and a plurality of wall portions 21D that are radially arranged to divide into a plurality of rotation cell portions 20, Through the bottom plate 18C of the cylindrical casing 18.

  The upper plate 18 </ b> B is provided with a dehydration target charging unit 23, and a moisture-containing solid is charged into the rotating cell unit 20 from the dehydration target charging unit 23. In addition, a gap is formed between the upper end of the rotor 21 and the upper plate 18B of the cylindrical casing 18, and the working substance supply unit 24 is inserted into the gap along the radial direction from the upper end of the side wall 18A. The working substance is supplied from the working substance supply unit 24 into the rotary cell unit 20. The working substance supply unit 24 is formed by a pipe having a sealed end and a plurality of holes or nozzles, for example.

  Further, a liquid working substance outflow portion 25 is formed at the lower end portion of the inner wall 21 </ b> C so as to correspond to each rotating cell portion 20. These outflow portions 25 are each attached with a member having a large number of holes such as a wire mesh or punching metal. Through these outflow portions 25, the liquid working material that has contacted the moisture-containing solid in each rotary cell portion 20 flows out into a ring-shaped liquid receiving portion 26 formed between the side wall 18 </ b> A and the inner wall 21 </ b> C. The ring-shaped liquid receiving portion 26 is partitioned into a plurality of liquid receiving chambers 27 by a partition plate (not shown) arranged radially. Each liquid receiving chamber 27 is formed across, for example, a plurality of rotating cell units 20. A hole is formed in the bottom surface of each liquid receiving chamber 27, and one of the holes functions as a discharge hole 28 for discharging the liquid working material containing moisture after dehydration, and the remaining holes are the outflow holes 29. Function as. As shown in FIG. 4, the outflow hole 29 is connected to a working substance resupply part 32 inserted above the adjacent liquid receiving chamber 27 via a pipe 31 provided with a pump 30. The liquid working material accumulated in the liquid receiving chamber 27 is supplied into the rotary cell unit 20 passing through the liquid receiving chamber 27 on the upstream side by the pump 30, the pipe 31, and the working material resupply unit 32. The working substance resupply unit 32 is configured in the same manner as the working substance supply unit 24.

  Next, the operation of the dehydrator 16 will be described. When the dehydrating device 16 is started and the rotary drive mechanism 22 is driven, the rotor 21 rotates in the clockwise direction in FIG. Coal as a moisture-containing solid is conveyed by, for example, the conveyor 33 and is charged from the dehydration target charging unit 23 into, for example, the most upstream rotary cell unit 20. The liquefied dimethyl ether as the working material is supplied from the working material supply unit 24 into, for example, the most downstream rotary cell unit 20. The liquid working substance supplied from above the rotating cell part 20 moves toward the outflow part 25 by gravity and centrifugal force while contacting the moisture-containing solid in the rotating cell part 20. The liquid working substance flowing out from the outflow part 25 moves in the direction opposite to the rotation direction of the rotation cell part 20 by the action of the pump 30, and enters the other rotation cell part 20 in the direction opposite to the rotation direction of the rotation cell part 20. Resupplied. As described above, the rotating cell portion 20 into which the moisture-containing solid is charged moves clockwise by the rotation of the rotor 21, whereas the liquid working material moves counterclockwise by the action of the pump 30. The solid and the working substance will be in countercurrent contact. This counter-current contact can increase the dewatering efficiency. In addition, a new liquid operation is performed from the working substance supply unit 24 to the rotating cell unit 20 that has reached the most downstream liquid receiving chamber 27 that is the rotating cell unit 20 that holds the dehydration target (coal) having the lowest water content. By supplying the substance, it is possible to efficiently remove the residual moisture of the dehydration target (coal). The liquid working material flows from the downstream liquid receiving chamber 27 toward the upstream liquid receiving chamber 27, and countercurrent contacts with each dehydration target (coal) in the rotating cell unit 20 reaching each liquid receiving chamber 27. Then, it reaches the discharge hole 28 while gradually increasing the concentration of the contained water. The liquid working material containing moisture discharged from the discharge hole 28 is sent to the storage tank 3 through the pipe 40G. On the other hand, the coal in the rotary cell unit 20 after the dehydration process is discharged to the outside through a discharge port 36 that can be opened and closed on the bottom plate 18C located on the downstream side of the working substance supply unit 24, for example, and collected. (See the white arrow shown in FIG. 4).

  Here, a conventional existing funnel cell extractor is usually used for extracting an aroma component contained in a solid using a liquid extractant at normal temperature and pressure. When such a funnel cell extractor is used as the dehydrator 16, it is necessary to consider the following points. That is, in order to use a liquefied product of dimethyl ether as a dehydrating agent, it is necessary to prevent evaporation of dimethyl ether, which becomes a gas under normal temperature and normal pressure, and keep it in a liquid state. For this purpose, it is necessary to make the inside of the dehydrating device 16 in a pressurized state and have a sealed structure that maintains the pressurized state, or to fill the inside of the dehydrating device 16 with saturated vapor of dimethyl ether to form a sealed structure. However, since the funnel extractor has a structure in which the rotor 21 rotates, it is extremely difficult to maintain the airtightness of the peripheral portion of the rotating shaft 19. Therefore, as shown in FIG. 2, it is desirable that the entire dehydrating device 16 is housed in a sealed container 34 filled with, for example, saturated vapor of a working substance (dimethyl ether). In this case, the working substance supply pipe 40 </ b> F / discharge pipe 40 </ b> G that is not a part that rotates together with the rotor 21, the moisture-containing solid supply pipe 35 connected to the dehydration target input unit 23, and the dehydration connected to the discharge port 36. A recovery tube (not shown) for the collected moisture-containing solid is pulled out of the sealed container 34 while maintaining the hermeticity of the sealed container 34 to facilitate connection with other elements constituting the moisture removal system 1. Is possible.

  In the moisture removal system 1 of this embodiment, as shown in FIG. 1, the outlet of the compressor 2 and the storage tank 3 are connected via a first pipe 40 </ b> A, and the storage tank 3 and the inlet of the evaporator 11 are decompressed. The second pipe 40B provided with the valve 10 is connected, the outlet of the evaporator 11 and the inlet of the separator 12 are connected via the third pipe 40C, the outlet of the separator 12 and the inlet of the water trap 13 Are connected via a fourth pipe 40D, the outlet of the water trap 13 and the inlet of the compressor 2 are connected via a fifth pipe 40E, and the first circulation path C1 is formed by these pipes 40A to 40E. . Water is removed from the contents of the storage tank 3 as dimethyl ether circulates in the first circulation path C1 while changing the state of gas and liquid. That is, the water dissolved in the liquefied dimethyl ether in the storage tank 3 is removed.

  Further, in this moisture removal system 1, the storage tank 3 and the working substance supply unit 24 of the dehydrating device 16 are connected via a sixth pipe 40 </ b> F provided with the liquid feed pump 17, and the working substance discharge hole of the dehydrating device 16 is provided. 28 and the storage tank 3 are connected via a seventh pipe 40G, and a second circulation path C2 is formed by these pipes 40F and 40G. As dimethyl ether circulates in the second circulation path C2, moisture is removed from the moisture-containing solid in the dehydrator 16, and the removed moisture is brought into the storage tank 3 in a form dissolved in liquefied dimethyl ether.

  Note that the system 6 of the first circuit C1 and the system 7 of the second circuit C2 do not necessarily need to operate at the same time, and only one of them may operate. For the separation of the first and second circulation paths C1 and C2, for example, the compressor 2 and the dehydrator 16 are started and stopped, and the valves 41, 43, and 49 provided in the pipes 40A to 40G are opened and closed, and the illustration is omitted. This is realized by a check valve.

  In the storage tank 3, for example, an amount of working substance that can dissolve a larger amount of water than the amount of water contained in the water-containing solid fed into the dehydrator 16 is supplied in advance through a pipe 38 that includes a valve 37. Yes. Thereby, even when only the system of the second circulation path C2 is operated, dehydration can be performed on the water-containing solid.

  Further, in the present embodiment, a partition wall 3C is provided that separates the internal space of the storage tank 3 into a dehydrating liquid chamber 3A and a regenerating liquid chamber 3B. In the dehydrating liquid chamber 3 </ b> A, the liquefied product of the working substance sent from the compressor 2 flows in, and the liquefied product flows out toward the dehydrating device 16. In the regenerating liquid chamber 3 </ b> B, the liquefied product of the working substance containing moisture discharged from the dehydrator 16 flows in, and the liquefied product flows out toward the water separation means 4. That is, the liquefied product of the working substance that does not contain moisture or has a very low moisture concentration is stored in the regeneration liquid chamber 3B, and the liquefied product of the working substance in which much moisture is dissolved is stored in the regeneration liquid chamber 3B. The Thereby, the dehydrating device 16 can efficiently perform the dehydration process using the working substance containing almost no water, and the water separation means 4 effectively performs the gas-liquid separation on the working substance containing a lot of water. be able to.

  Here, if the dehydrating liquid chamber 3A and the regenerating liquid chamber 3B are completely separated, the processing speed of the system 6 of the first circulation path C1 and the system 7 of the second circulation path C2 is increased. When they are different or when these systems 6 and 7 are operated separately, there is a possibility that the regenerating liquid chamber 3B or the dehydrating liquid chamber 3A will be emptied, leading to failure or the like. Therefore, for example, in the present embodiment, the partition 3C is configured to allow movement of the liquefied working substance between the dehydrating liquid chamber 3A and the regeneration liquid chamber 3B. Specifically, the height of the partition wall 3C is set so that the vertically upper space inside the storage tank 3 is continuous between the dehydrating liquid chamber 3A and the regenerating liquid chamber 3B, and the dehydrating liquid chamber 3A And the pressure in the regenerating liquid chamber 3B are made equal, and a flow hole 3D is provided in the partition wall 3C. As a result, the liquefied working substance passes between the dehydrating liquid chamber 3A and the regenerating liquid chamber 3B through the flow hole 3D so that the liquid surface heights of the dehydrating liquid chamber 3A and the regenerating liquid chamber 3B are equal. Moving. By configuring in this way, the liquefied product of the working substance that does not contain moisture sent from the compressor 2 and the liquefied product of the working substance that contains a large amount of moisture discharged from the dehydrator 16 are hardly mixed, and It is possible to avoid inconveniences when the processing speeds of the system 6 of the first circuit C1 and the system 7 of the second circuit C2 are greatly different or when these systems 6 and 7 are operated separately. In addition, as a structure which accept | permits the movement of the liquefying operation substance between 3A of dehydration liquid chambers, and the liquid chamber 3B for reproduction | regeneration, it is not necessarily limited to what provides the circulation hole 3D as mentioned above, For example, liquefaction operation It may be configured to allow movement between the dehydrating liquid chamber 3A and the regenerating liquid chamber 3B when the substance overflows from the partition wall 3C.

  Further, when the solid (coal) after the dehydration operation is taken out from the dehydrator 16, if liquefied dimethyl ether remains in the dehydrator 16, the dimethyl ether remaining in the dehydrator 16 is rapidly increased under atmospheric pressure. There is a risk of swelling. For this reason, it is necessary to extract the liquefied dimethyl ether remaining in the dehydrator 16 before taking out the solid (coal) after the dehydration operation from the dehydrator 16. Therefore, for example, in the present embodiment, a flow path 39 that connects the dehydrating means 5 and the water separating means 4 is provided, and the working substance remaining in the dehydrating means 5 is extracted to the water separating means 4 side through the flow path 39. I am doing so. More specifically, the dehydrator 16 and the evaporator 11 are connected via an eighth pipe 39 including a first valve 41 and a pressure reducing valve 42. When the system 7 of the second circulation path C2 is operating, the first valve 41 is closed. When extracting the liquefied dimethyl ether remaining in the dehydrating device 16, the system 7 of the second circulation path C2 is stopped, and the second valve 43 provided in the seventh pipe 40G connecting the dehydrating device 16 and the storage tank 3 is used. Is closed, the first valve 41 is opened, and the liquefied dimethyl ether remaining in the dehydrating device 16 is extracted to the evaporator 11 by the pressure difference by the pressure reducing valve 42 and evaporated by the evaporator 11.

  It is preferable that dimethyl ether which is a working substance performs a series of operations according to the system 1 of the present invention in a temperature range of about 0 ° C. to 50 ° C., for example. Further, in order to keep dimethyl ether in a liquid state, the second circulation path C2 (inside the dehydrator 16) is provided between the outlet of the compressor 2 in the first circulation path C1 and the pressure reducing valve 10 (including the inside of the storage tank 3). Between the dehydrator 16 and the pressure reducing valve 42 is in a pressurized state. Further, the air in the first and second circulation paths C <b> 1 and C <b> 2 is collected in the storage tank 3 and is stored in the upper part of the internal space of the storage tank 3. This accumulated air is discarded from, for example, the valve 44 at the top of the storage tank 3.

  The system 1 involves three things: coal as water-containing solid, water, and dimethyl ether as working material. Below, the flow of this system 1 which paid its attention to each of these substances is demonstrated. 1 and 6, the solid arrows indicate the flow of high-purity dimethyl ether, the broken arrows indicate the flow of water, and the two-dot chain line indicates the flow of dimethyl ether in which water is dissolved. Coal as a moisture-containing solid is put into the dehydrator 16 and dehydrated with liquefied dimethyl ether, and then taken out from the dehydrator 16.

  Water is supplied to the system 1 from the dehydrator 16 as moisture in the moisture-containing solid. First, after elution into the liquefied dimethyl ether by the dehydrator 16, it is stored in the regenerating liquid chamber 3 </ b> B of the storage tank 3 and reaches the evaporator 11 in a form dissolved in the liquefied dimethyl ether. Most of the liquefied dimethyl ether is vaporized in the evaporator 11, and the water dissolved in the liquefied dimethyl ether is separated.

  The dimethyl ether gas is pressurized by the compressor 2 to become superheated gas, and then condensed to form liquefied dimethyl ether, which is stored in the dehydrating liquid chamber 3A of the storage tank 3. The liquefied dimethyl ether in the storage tank 3 is supplied to the dehydrator 16 and the evaporator 11, respectively. The liquefied dimethyl ether supplied to the dehydrator 16 dissolves the moisture of the moisture-containing solid, and the liquefied dimethyl ether containing moisture returns to the storage tank 3 again. On the other hand, in the liquefied dimethyl ether supplied to the evaporator 11, only the dimethyl ether component is selectively evaporated in the evaporator 11, and the water dissolved in the dimethyl ether remains in a liquid state without evaporating. The dimethyl ether gas and moisture are separated into gas and liquid by the separator 12, and the separated dimethyl ether gas passes through the water trap 13 and returns to the compressor 2 again.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. The moisture removal system 1 of the present invention is not limited to the configuration shown in FIG. 1, and may be configured as shown in FIG. 6, for example.

  In the configuration example shown in FIG. 6, a cooler 9 is disposed between the compressor 2b and the storage tank 3, and the superheated gas of dimethyl ether is condensed and liquefied immediately before the storage tank 3 by the cooler 9. Yes. In this case, as shown in the figure, the cooler 9 and the evaporator 11 may be connected by a heat exchanger 45 to recover the latent heat of evaporation of the liquefied dimethyl ether for effective use. Further, the dimethyl ether vapor separated by the separator 12 may be adiabatically expanded by the expander 46 to perform work outside. In the example of FIG. 6, the compressor has two stages, the first compressor 2 a and the expander 46 are connected, the work performed by the expander 46 is recovered, and used as power for the first compressor 2 a. Note that the cooler 47 adjusts the temperature of the gas discharged from the expander 46 to the optimum temperature at the inlet of the first compressor 2a. The temperature of the liquefied dimethyl ether vaporized by the evaporator 11 is adjusted by the cooler 48.

  Below, the example of a setting of the pressure in the system 1, the temperature, and the processing amount when using dimethyl ether as an operating substance is shown. In order to simplify the design of pressure and temperature, it was assumed that the deaeration tower 14 was omitted and the separator 12 could completely separate water and dimethyl ether. Further, it was assumed that the water-containing solid treated by the dehydrator 16 did not contain dimethyl ether. First, the temperature and pressure conditions in the first circulation path C1 were set starting from the inlet of the compressor 2.

  For dimethyl ether at the inlet of the compressor 2, when the temperature is 25 ° C. and the saturation temperature is 15 ° C., the pressure is 0.44 MPa. The higher the saturation temperature at the inlet of the compressor 2, the higher the pressure at the inlet of the compressor 2, so the power of the compressor 2 decreases. Further, since the heat capacity ratio of dimethyl ether is as small as 1.11, the temperature rise during adiabatic compression is small. For example, assuming adiabatic compression, when the outlet pressure of the compressor 2 is 0.78 MPa, the outlet temperature of the compressor 2 is 43 ° C. and the saturation temperature is 35 ° C. Thus, the superheat degree at the compressor 2 outlet becomes smaller than the superheat degree at the compressor 2 inlet.

  Since the temperature of the liquefied dimethyl ether in the storage tank 3 is substantially the same as the outside air temperature, it is lower than the outlet temperature of the compressor 2. Further, since the amount of liquefied dimethyl ether in the storage tank 3 is larger than the amount of dimethyl ether gas to be compressed, the dimethyl ether gas discharged from the compressor 2 is cooled and condensed by the liquefied dimethyl ether in the storage tank 3. The latent heat of evaporation released at this time escapes to the outside as heat dissipation from the system 1.

  In the storage tank 3, the high-purity liquefied dimethyl ether flowing from the compressor 2 and the water-containing liquefied dimethyl ether flowing from the dehydrator 16 are partially mixed. The liquefied dimethyl ether flowing from the storage tank 3 to the evaporator 11 is depressurized by the pressure reducing valve 10 to 0.44 MPa which is equal to the pressure at the inlet of the compressor 2. Since the saturation temperature of dimethyl ether at 0.44 MPa is 15 ° C., liquefied dimethyl ether at room temperature evaporates and expands in the evaporator 11. The temperature of the expanded dimethyl ether gas falls to the saturation temperature of 15 ° C. This is lower than the original inlet temperature of the compressor 2 of 25 ° C., and if it is circulated as it is, there is a possibility that the temperature in the first circulation path C1 is lowered, so the evaporator 11 is heated to 25 ° C. .

  Further, the temperature and pressure conditions in the second circulation path C2 are substantially the same as the temperature and pressure of the liquefied dimethyl ether in the storage tank 3, but in order to supply the liquefied dimethyl ether to the dehydrator 16, the first condition in the storage tank 3 is used. Differential pressure is generated at the 6th pipe 40F side inlet and the 7th pipe 40G side outlet. Since the pressure difference is increased by the liquid feed pump 17, the pressure from the liquid feed pump 17 to the outlet on the seventh pipe 40G side in the storage tank 3 is higher than that of other parts in the second circulation path C2. . The value is about 0.1 MPa to several MPa.

  For example, let us consider a case where the dehydrator 16 is filled with 5 liters (≈5 kg) of a water-containing solid having a water content of 50% to dehydrate. In this case, the initial moisture content in the dehydrator 16 is 2.5 kg. Since the water solubility of liquefied dimethyl ether is 6.7% by mass at room temperature, the minimum liquefied dimethyl ether necessary to dissolve 2.5 kg of water is 2.5 ÷ 0.067 = 37.3 kg. is there. Moreover, since the density of liquefied dimethyl ether at room temperature is 0.67 kg / liter, the volume of 37.3 kg of liquefied dimethyl ether is 55.7 liters. In contrast, the storage tank 3 is assumed to be filled with 200 liters of liquefied dimethyl ether.

  The system 6 of the first circuit C1 is not operated, the system 7 of the second circuit C2 is operated for 1 hour, and operating conditions are set during which moisture-containing solids are almost completely dehydrated. As dehydration progresses, the water concentration in the liquefied dimethyl ether in the storage tank 3 increases. However, since the partition tank 3C is provided in the storage tank 3, the liquefied dimethyl ether in the storage tank 3 is uniformly mixed. is not.

  In the least preferred case, it is assumed that all of the moisture in the moisture-containing solid has been dehydrated and this moisture has been thoroughly mixed with the liquefied dimethyl ether in the reservoir 3. Even in this case, the water concentration in the liquefied dimethyl ether in the storage tank 3 rises only to 55.7 / 200 * 6.7% = 1.87%. This is significantly lower than the saturation concentration of 6.7% and does not impair the dewatering performance. Furthermore, in practice, by providing the partition wall 3C in the storage tank 3, the water is not completely mixed with the liquefied dimethyl ether in the storage tank 3, so the water concentration in the liquefied dimethyl ether supplied to the dehydrator 16 Is lower than the above value (1.87%), and the amount of liquefied dimethyl ether required for dehydration does not increase significantly.

When the supply rate of liquefied dimethyl ether to the dehydrator 16 is set to 200 liter / h, the dehydration operation is completed in 17 minutes. On the other hand, the processing amount of the dimethyl ether gas by the compressor 2 in the system of the first circuit C1 is set to 20 Nm ³ / h. The density of dimethyl ether gas 2.06 kg / ^{m 3,} the density of the liquefied dimethyl ether because it is 670 kg / ^{m 3,} when the processing speed of the compressor 2 is converted to the volume of dimethyl ether liquified state is 61.5 l / h.

If it is assumed that water and liquefied dimethyl ether are completely mixed in the storage tank 3, 200 liters of liquefied dimethyl ether having a moisture concentration of 1.87% exists in the storage tank 3. Assume that the water in the liquefied dimethyl ether is separated by the system 6 of the first circulation path C1, and that the pure liquefied dimethyl ether flowing into the storage tank 3 from the compressor 2 is instantaneously completely mixed with the liquefied dimethyl ether in the storage tank 3. The change in the water concentration in the liquefied dimethyl ether in the storage tank 3 can be calculated by the following formula 1.

Here, V in Formula 1 is the volume of liquefied dimethyl ether in the storage tank 3, and C is the water concentration in the liquefied dimethyl ether. v is the processing rate in terms of volume of dimethyl ether in the liquefied state of the compressor 2. t is time. In the above equation 1, since the boundary condition of t = 0, C = 1.87%; t = t, C = C is satisfied, the following equation 2 is satisfied.

Therefore, the change over time of the water concentration in the liquefied dimethyl ether in the reservoir accompanying the operation of the system 6 of the first circuit C1 is expressed by the following formula 3 and the graph shown in FIG. The unit of C is% and the unit of t is 1 hour.

   As shown in FIG. 5, for example, when the system 6 of the first circulation path C1 is operated for 3 hours, the water concentration in the liquefied dimethyl ether in the storage tank 3 is reduced to 0.74%, which is equivalent to almost pure liquefied dimethyl ether. become. When the system 6 of the first circulation path C1 is operated for 10 hours, the water concentration in the liquefied dimethyl ether in the storage tank 3 is 0.047%, and when the system is further operated for 24 hours, the water concentration is reduced to 0.0012%. To do.

  The above calculation is based on the assumption that the pure liquefied dimethyl ether flowing from the compressor 2 into the storage tank 3 is instantaneously completely mixed with the liquefied dimethyl ether in the storage tank 3, and in fact, the existence of the partition wall 3C. Therefore, it is difficult to mix the pure liquefied dimethyl ether flowing from the compressor 2 into the storage tank 3 and the liquefied dimethyl ether in the storage tank 3, so that water can be separated from the liquefied dimethyl ether in the storage tank 3 in a shorter time. Thus, the first and second circulation paths are operated by the present system 1, for example, the system 7 of the second circulation path C2 is operated for 17 minutes and the system 6 of the first circulation path C1 is operated for 3 hours. By making the operating conditions of the C1 and C2 systems 6 and 7 optimum, respectively, the water-containing solid can be dehydrated easily and efficiently.

  As described above, according to the present invention, the system 6 of the first circuit C1 and the system 7 of the second circuit C2 are independent from each other, and each system 6, 7 can be operated separately. Since it is possible, it is not necessary to match the throughput of the compressor 2 belonging to the system 6 of the first circuit C1 and the dehydrator 16 belonging to the system 7 of the second circuit C2, and the compressor 2 and the dewatering It is possible to independently set optimum operating conditions in the systems 6 and 7 so that the apparatus 16 can exhibit the highest efficiency and performance.

It is a block diagram which shows an example of a structure of the removal system of the solid content water | moisture content using the liquefied substance of this invention. An example of the structure of a dehydrating apparatus is shown, and a part is cut away. It is sectional drawing seen from the side surface of the spin-drying | dehydration apparatus of FIG. It is a conceptual diagram which shows the flow of the working substance in the dehydration apparatus of FIG. It is a graph which shows the relationship between the water concentration in the liquefied dimethyl ether in a storage tank, and the operation time of the system of the 1st circuit. It is a block diagram which shows the other structural example of the removal system of the solid content water | moisture content using the liquefied substance of this invention. It is a block diagram which shows the removal system of the solid content water | moisture content using the conventional liquefied substance.

Explanation of symbols

1 Moisture removal system 2 Compressor (liquefaction means)
DESCRIPTION OF SYMBOLS 3 Storage tank 3A Dehydrating liquid chamber 3B Regenerating liquid chamber 3C Partition 4 Water separation means 5 Dehydrating means C1 First circulation path C2 Second circulation path 6 First circulation path system 7 Second circulation path system 14 Deaeration tower 16 Dehydrator 17 Liquid feed pump 18 Casing 19 Rotating shaft 20 Rotating cell part 21 Rotor 22 Rotation drive mechanism

Claims (9)

  25.degree. C., a substance that is a gas at 1 atm, using as a working substance, a liquefying means for liquefying the working substance gas by pressurization, cooling, or a combination of pressurization and cooling, and storage for storing the liquefied working substance. A tank and a water separation means for separating the gas and moisture of the working substance by taking out the working substance containing moisture from the storage tank and vaporizing the working substance are connected in series, and the water separation means A first circulation path is formed in which the working substance vaporized by the water separation means is connected to the liquefying means and liquefied again by the liquefying means, and the operation is liquefied from the storage tank and the storage tank A dehydrating means for taking out the substance and bringing the working substance into contact with the water-containing solid to dissolve the water and dehydrating is connected in series, and the dehydrating means and the storage tank are in contact with each other. A second circulation path is formed in which the working substance containing moisture discharged from the dehydrating means is returned to the storage tank, and the first and second circulation paths can be operated simultaneously or separately. A solid content moisture removing system using a liquefied substance.   The solid-containing moisture using a liquefied substance according to claim 1, wherein the working substance is one substance selected from dimethyl ether, ethyl methyl ether, formaldehyde, ketene, and acetaldehyde, or a mixture of two or more thereof. Removal system.   3. The solid-containing moisture removal system using a liquefied substance according to claim 1, wherein the dehydrating means brings the liquefied product of the working substance into contact with the moisture-containing solid countercurrently.   The dehydrating means includes a casing, a rotating shaft disposed at the axial center of the casing, a rotor having a plurality of rotating cell portions that rotate within the casing via the rotating shaft, and the rotor by the rotating shaft. A rotary drive mechanism for rotating the rotary cell unit, supplying the working substance into the rotary cell part and supplying the working substance, and rotating the rotor by the rotary drive mechanism, the working substance in the rotary cell part And the moisture-containing solid are brought into contact with each other, and the dehydrating device that re-feeds the working substance after the contact to another rotating cell part in a direction opposite to the rotating direction of the rotating cell part, and the working substance from the storage tank The system for removing solid-containing water using the liquefied substance according to claim 3, further comprising: a liquid feed pump for feeding the liquid to the dehydrator.   A dehydrating liquid chamber into which the liquefied product of the working substance sent from the liquefying unit flows into the internal space of the storage tank and the liquefied product flows out toward the dehydrating unit, and moisture sent from the dehydrating unit 5. A partition wall that is separated from a regeneration liquid chamber into which a liquefied product of the working substance containing the liquefied material flows in and the liquefied material flows out toward the water separation means. The solid content moisture removal system using the liquefied substance described in 1.   6. The solid-containing moisture using a liquefied substance according to claim 5, wherein the partition wall is configured such that a liquefied product of the working substance can move between the dehydrating liquid chamber and the regeneration liquid chamber. Removal system.   A degassing tower for degassing the working substance contained in the water separated by the water separation means is connected to the water separation means, and the degassing tower is connected to the first circulation path. The system for removing solid-containing water using a liquefied substance according to any one of claims 1 to 6, wherein the degassed working substance is recovered and returned to the first circulation path. .   It has a flow path connecting the dehydrating means and the water separating means, and the working substance remaining in the dehydrating means is extracted to the water separating means side through the flow path. A solid content moisture removing system using the liquefied substance according to any one of claims 1 to 7. 25.degree. C., a substance that is a gas at 1 atm, using as a working substance a liquefying means for liquefying the gas of the working substance by pressurization, cooling, or a combination of pressurization and cooling, and storage for storing the liquefied working substance. A tank and a water separation means for separating the gas and moisture of the working substance by removing the working substance containing moisture from the storage tank and evaporating the working substance in series; and the water separation means A first circulation path for connecting the liquefying means and liquefying the working substance vaporized by the water separating means again by the liquefying means is formed, and the storage tank and the working substance liquefied from the storage tank are The dehydrating means for dehydrating by dissolving the water by bringing the working substance into contact with the water-containing solid and connecting the dehydrating means and the storage tank are connected in series. Forming a second circulation path for returning the working substance containing moisture discharged from the means to the storage tank, and circulating the working substance in the first circulation path to thereby remove water from the contents of the storage tank. Removing the water from the moisture-containing solid by circulating the working substance in the second circuit, and operating the systems of the first and second circuits simultaneously or separately. A method for removing moisture containing solids using a liquefied substance.

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