High-efficiency steam power cycle system with cascaded energy utilization

Abstract

The present invention relates to the field of energy and power engineering technology, and provides a high-efficiency steam power cycle system with cascaded energy utilization, comprising: a steam cycle system and an organic working medium Rankine cycle system; the steam cycle system comprises a steam generator, a steam turbine, a condenser and a separation device, the separation device is provided with a first outlet and a second outlet; the outlet of the steam generator, the steam turbine, the condenser, the inlet of the separation device, the first outlet and the inlet of the steam generator are connected in sequence; the organic working medium Rankine cycle system comprises a heat exchanger, the heat exchanger has a water-based absorbent inlet and a water-based absorbent outlet; the water-based absorbent outlet, the inlet of the condenser, the inlet of the separation device, the second outlet and the water-based absorbent inlet are connected in sequence; the separation device is used to separate a mixed liquid discharged from the condenser into water and a water-based absorbent solution; wherein the water flows to the steam generator through the first outlet, and the water-based absorbent solution flows to the heat exchanger through the second outlet.

Description

Technical Field

[0001] The present invention relates to the field of energy and power engineering technology, and in particular to a high-efficiency steam power cycle system with cascaded energy utilization. Background Art

[0002] The Steam Rankine Cycle plays a vital role in the field of energy and power engineering. This system converts thermal energy into mechanical energy, powering industrial production or generating electricity, making it a core component of modern energy conversion technology. The basic operating principle of the Steam Rankine Cycle is that water is heated in a boiler to produce steam, which then passes through a steam turbine to generate work before being discharged into a condenser to condense into water, which is then pumped back into the boiler, forming a closed loop.

[0003] The thermal efficiency of a steam Rankine cycle system reflects the system's ability to convert thermal energy into mechanical energy and is a key indicator of its performance. Existing steam Rankine cycle systems have low thermal efficiency, resulting in a large amount of energy being wasted. Summary of the Invention

[0004] The present invention provides a high-efficiency steam power cycle system with cascaded energy utilization, which is used to solve the problem in the prior art that the steam Rankine cycle system has low thermal efficiency and causes a large amount of energy to be wasted.

[0005] The present invention provides a high-efficiency steam power cycle system for cascaded energy utilization, comprising: a steam cycle system and an organic working fluid Rankine cycle system; the steam cycle system comprises a steam generator, a steam turbine, a condenser and a separation device, the separation device being provided with a first outlet and a second outlet; the outlet of the steam generator, the steam turbine, the condenser, the inlet of the separation device, the first outlet and the inlet of the steam generator being connected in sequence; the organic working fluid Rankine cycle system comprises a heat exchanger, the heat exchanger having a water-based absorbent inlet and a water-based absorbent outlet; the water-based absorbent outlet, the inlet of the condenser, the inlet of the separation device, the second outlet and the water-based absorbent inlet being connected in sequence; the separation device being used to separate the mixed liquid discharged from the condenser into water and a water-based absorbent solution; wherein the water flows to the steam generator through the first outlet, and the water-based absorbent solution flows to the heat exchanger through the second outlet.

[0006] According to the high-efficiency steam power cycle system with cascaded energy utilization provided by the present invention, the outlet of the condenser is connected to the inlet of the water-based absorbent.

[0007] According to a high-efficiency steam power cycle system with cascaded energy utilization provided by the present invention, the organic working fluid Rankine cycle system also includes a turbine, and the heat exchanger also has an organic working fluid inlet and an organic working fluid outlet, and the organic working fluid outlet, the turbine and the organic working fluid inlet are connected in sequence; the turbine is used to convert thermal energy into mechanical energy or electrical energy.

[0008] According to the high-efficiency steam power cycle system with cascaded energy utilization provided by the present invention, the organic working medium Rankine cycle system further includes a cooler, the inlet of the cooler is connected to the outlet of the turbine, and the outlet of the cooler is connected to the inlet of the organic working medium.

[0009] According to the high-efficiency steam power cycle system with cascaded energy utilization provided by the present invention, the organic working medium Rankine cycle system further includes a first pumping element, which is provided between the outlet of the cooler and the inlet of the organic working medium.

[0010] According to the present invention, a high-efficiency steam power cycle system with cascaded energy utilization is provided, wherein the steam cycle system further includes a second pumping member, which is arranged between the first outlet and the steam generator.

[0011] According to the high-efficiency steam power cycle system with cascaded energy utilization provided by the present invention, a regulating member is provided between the outlet of the condenser and the inlet of the water-based absorbent or between the inlet of the separation device.

[0012] According to a high-efficiency steam power cycle system with cascaded energy utilization provided by the present invention, the steam cycle system also includes a third pumping member, the inlet of the third pumping member is connected to the outlet of the condenser, and the outlet of the third pumping member is respectively connected to the inlet of the water-based absorbent and the inlet of the separation device.

[0013] According to the high-efficiency steam power cycle system with cascaded energy utilization provided by the present invention, the water-based absorbent includes a salt solution.

[0014] According to the high-efficiency steam power cycle system with cascaded energy utilization provided by the present invention, the separation device includes a membrane distillation separation device.

[0015] The present invention provides a high-efficiency steam power circulation system with cascaded energy utilization. Under the condition that the steam pressure in the condenser is constant and the work of the turbine remains unchanged, a water-based absorbent is input into the condenser through the water-based absorbent outlet of the heat exchanger, which can greatly increase the outlet temperature of the condenser; after the mixed liquid at the condenser outlet is separated by a separation device, it enters the heat exchanger to exchange heat with the organic working fluid, and the heat energy is transferred to the organic working fluid circulation system and converted into mechanical energy or electrical energy, thereby improving the thermal efficiency of the system and improving the utilization rate of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of a high-efficiency steam power cycle system for cascaded energy utilization provided by the present invention;

[0018] Reference numerals:

[0019] 100. Steam circulation system;

[0020] 110, steam generator; 120, steam turbine; 130, condenser; 140, separation device; 141, first outlet; 142, second outlet; 150, second pumping element; 160, third pumping element;

[0021] 200. Organic working fluid Rankine cycle system; 210. Heat exchanger; 220. Turbine; 230. Cooler; 240. First pumping element. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the embodiments of the present invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0026] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will appreciate the applicability of other processes and / or the use of other materials.

[0028] In order to improve the thermal efficiency of the steam Rankine cycle system, the most direct way is to increase the maximum temperature of the circulation system or reduce the minimum pressure in the circulation system. The maximum temperature in the circulation system is limited by the temperature of the heat source and the temperature resistance of the material, which makes it difficult to increase. However, the lowest pressure in the circulation system is located in the condenser. Since the medium discharged from the turbine into the condenser is saturated steam, the minimum pressure is related to the minimum temperature. Therefore, reducing the medium pressure means reducing the temperature, and the reduction in medium temperature is limited by the ambient cold source temperature. Based on this, an embodiment of the present invention proposes to use the temperature difference between the minimum temperature of the circulation system and the ambient temperature to generate electricity while keeping the maximum temperature and minimum pressure of the circulation system unchanged, thereby improving the thermal efficiency of the circulation system.

[0029] The following combination Figure 1 The invention describes a high-efficiency steam power cycle system for cascaded energy utilization.

[0030] The high-efficiency steam power cycle system for cascaded energy utilization provided in an embodiment of the present invention includes a steam cycle system 100 and an organic working fluid Rankine cycle system 200 .

[0031] The steam cycle system 100 is a thermodynamic cycle system that converts thermal energy into mechanical energy, which can then be used to generate electricity or provide power. The steam cycle system 100 includes a steam generator 110, a steam turbine 120, and a condenser 130. The outlet of the steam generator 110 is connected to the inlet of the steam turbine 120, which in turn is connected to the inlet of the condenser 130. The outlet of the condenser 130 is connected to the inlet of the steam generator 110. The steam generator 110 heats water, converting it into high-temperature, high-pressure steam, which is then fed into the steam turbine 120. The high-temperature, high-pressure steam expands in the steam turbine 120, generating mechanical energy that drives a generator or other mechanical device connected to the shaft of the steam turbine 120. As the steam passes through the steam turbine 120, its pressure and temperature gradually decrease. The low-pressure steam discharged from the steam turbine 120 enters the condenser 130, where it is cooled by cooling water or air to form condensate. The condensed water is returned to the steam generator 110, completing the cycle.

[0032] A water-based absorbent has a saturated vapor pressure lower than that of pure water at the same temperature. At the same saturated vapor pressure, the temperature of the water-based absorbent is higher than that of pure water. To increase the temperature at the outlet of condenser 130, embodiments of the present invention introduce a water-based absorbent into condenser 130. The water-based absorbent mixes with the low-pressure steam discharged from turbine 120. While maintaining a constant steam pressure within condenser 130, this significantly increases the water temperature within condenser 130, forming a water-based absorbent solution above the ambient temperature. It should be understood that low-pressure water vapor exists within condenser 130. The water-based absorbent in embodiments of the present invention can be formed by uniformly dissolving a certain concentration of salt in water. This salt solution exhibits absorption properties, namely, a saturated vapor pressure lower than that of pure water at the same temperature, and a temperature higher than that of pure water at the same saturated vapor pressure. The salt can be lithium bromide or other salts with similar properties.

[0033] The organic working medium Rankine cycle system 200 includes a heat exchanger 210 having a water-based absorbent inlet and a water-based absorbent outlet. The water-based absorbent exchanges heat with the organic working medium in the organic working medium Rankine cycle system in the heat exchanger 210 , and the water-based absorbent after heat exchange enters the condenser 130 .

[0034] The steam cycle system 100 includes two circulation loops, steam and water-based absorbent. In order to prevent the water-based absorbent from entering the steam loop, a separation device 140 is provided between the condenser 130 and the steam generator 110 in an embodiment of the present invention. The separation device 140 is used to separate the mixed liquid discharged from the condenser 130 into water and a water-based absorbent solution. Specifically, the separation device 140 has an inlet, a first outlet 141, and a second outlet 142. The water-based absorbent outlet, the inlet of the condenser 130, the inlet of the separation device 140, the second outlet 142, and the water-based absorbent inlet are connected in sequence. The water-based absorbent exchanges heat with the organic working fluid in the organic working fluid Rankine cycle system in the heat exchanger 210. After the heat exchange, the water-based absorbent enters the condenser 130 and mixes with the low-pressure steam discharged from the turbine 120 to form a mixed liquid of the water-based absorbent solution and water at a temperature higher than the ambient temperature. The mixed liquid enters separation device 140 for separation. The water separated by separation device 140 flows to steam generator 110 through first outlet 141 and enters the next cycle. The water-based absorbent solution separated by separation device 140 enters heat exchanger 210 through second outlet 142, exchanges heat with the organic working fluid, and then enters condenser 130 again. It should be noted that the parameters of the water separated by separation device 140 and the water formed in condenser 130 are the same. In one embodiment, separation device 140 is a membrane distillation separation device.

[0035] The embodiment of the present invention provides a high-efficiency steam power cycle system with cascaded energy utilization. When the steam pressure in the condenser 130 is constant and the work of the turbine 120 remains unchanged, a water-based absorbent is input into the condenser 130 through the water-based absorbent outlet of the heat exchanger 210, which can greatly increase the outlet temperature of the condenser 130; the mixed liquid at the outlet of the condenser 130 is separated by the separation device 140, and then enters the heat exchanger 210 to exchange heat with the organic working fluid. The heat energy is transferred to the organic working fluid circulation system and converted into mechanical energy or electrical energy, thereby improving the thermal efficiency of the system and improving the utilization rate of energy.

[0036] In this embodiment of the present invention, the outlet of condenser 130 is connected to the inlet of separation device 140 and the water-based absorbent inlet of heat exchanger 210, respectively. Specifically, the water-based absorbent solution formed in condenser 130, which is higher than the ambient temperature, partially enters heat exchanger 210 to exchange heat with the organic working fluid, and partially enters separation device 140 for separation. The water-based absorbent enters heat exchanger 210 to exchange heat with the organic working fluid, and the separated water enters steam generator 110 for the next cycle.

[0037] The embodiment of the present invention reduces the separation pressure of separation device 140 by diverting the flow, and also adjusts the medium flow rate in the steam circulation system. It should be noted that the water-based absorbent solution discharged from the outlet of condenser 130 and the water-based absorbent solution separated by separation device 140 can be mixed and then enter heat exchanger 210 to exchange heat with the organic working medium.

[0038] In the embodiments of the present invention, the flow rate entering heat exchanger 210 and the flow rate entering separation device 140 through condenser 130 are not specifically limited and can be adjusted according to actual operating conditions. In one embodiment, a regulating member is provided between the outlet of condenser 130 and the inlet of the water-based absorbent of heat exchanger 210 to adjust the flow rate from the outlet of condenser 130 into heat exchanger 210. Alternatively, a regulating member is provided between the outlet of condenser 130 and the inlet of separation device 140 to adjust the flow rate from the outlet of condenser 130 into separation device 140.

[0039] like Figure 1 As shown, the organic working fluid Rankine cycle system 200 in the embodiment of the present invention further includes a turbine 220. The heat exchanger 210 also has an organic working fluid inlet and an organic working fluid outlet. The organic working fluid outlet, the turbine 220, and the organic working fluid inlet are sequentially connected to form the organic working fluid Rankine cycle system 200, whose circulating medium is the organic working fluid. The water-based absorbent outlet, the inlet of the condenser 130, the inlet and second outlet 142 of the separator 140, and the water-based absorbent inlet are sequentially connected, and its circulating medium is the water-based absorbent. The water-based absorbent enters the condenser 130 through the water-based absorbent outlet and the inlet of the condenser 130, mixes with water, forms a water-based absorbent solution, and its temperature rises; then enters the heat exchanger 210 through the outlet of the condenser 130 or the second outlet 142 of the separator 140, and exchanges heat with the organic working fluid to convert it into high-temperature and high-pressure steam. High-temperature, high-pressure steam enters turbine 220, where it expands and performs work, converting the heat energy carried by the high-temperature, high-pressure organic working fluid into mechanical or electrical energy. This effectively utilizes the temperature difference and improves the system's thermal efficiency. After performing work in turbine 220, the organic working fluid is converted into low-temperature, low-pressure gas and enters the next cycle. After exchanging heat with the organic working fluid, the water-based absorbent enters condenser 130 again and enters the next cycle. In this embodiment of the present invention, multiple turbines 220 may be provided, forming a turbine train.

[0040] Furthermore, the organic working fluid Rankine cycle system 200 also includes a cooler 230. The inlet of cooler 230 is connected to the outlet of turbine 220, and the outlet of cooler 230 is connected to the organic working fluid inlet of heat exchanger 210. Cooler 230 is used to cool the organic working fluid exiting turbine 220, forming a low-temperature, low-pressure organic working fluid. The organic working fluid then enters heat exchanger 210 through the organic working fluid inlet, exchanges heat with the water-based absorbent, and then proceeds to the next cycle. Cooler 230 may include an air cooler, a water cooler, or the like.

[0041] In the present invention, a water-based absorbent is input into the condenser 130 via the heat exchanger 210. The water-based absorbent is mixed with the low-pressure steam discharged from the turbine 120 in the condenser 130, thereby increasing the water temperature in the condenser 130 and forming a water-based absorbent solution higher than the ambient temperature, thereby forming an energy ladder. The heat is transferred to the organic working fluid Rankine cycle system 200 via the separation device 140 or directly through the heat exchanger 210, and converted into mechanical energy or electrical energy, thereby improving the thermal efficiency of the system.

[0042] The organic working fluid Rankine cycle system 200 according to the present embodiment further includes a first pumping element 240 , which is disposed between the outlet of the cooler 230 and the organic working fluid inlet of the heat exchanger 210 . The first pumping element 240 increases the flow rate of the fluid, reduces the thermal resistance of the fluid, and allows the liquid organic working fluid at the outlet of the cooler 230 to quickly enter the heat exchanger 210 , thereby improving the heat exchange efficiency of the heat exchanger 210 . The first pumping element 240 can be an organic working fluid pump.

[0043] The steam circulation system 100 in this embodiment of the present invention further includes a second pumping element 150 , which is disposed between the first outlet 141 and the steam generator 110 . This second pumping element 150 allows the water separated by the separation device 140 to quickly enter the steam generator 110 , ensuring continuous water flow and efficient circulation. This also helps reduce pressure and heat losses in the system, thereby improving overall system efficiency. Second pumping element 150 can be a feedwater pump.

[0044] Steam cycle system 100 also includes a third pumping element 160. The inlet of third pumping element 160 is connected to the outlet of condenser 130. The outlet of third pumping element 160 is connected to the water-based absorbent inlet of heat exchanger 210 and the inlet of separator 140, respectively. Third pumping element 160 quickly distributes the low-temperature fluid (a mixture of water and water-based absorbent) at the outlet of condenser 130 to heat exchanger 210 or to separator 140 for separation, thereby improving heat recovery efficiency, ensuring stable system operation, and maximizing heat energy utilization. Third pumping element 160 can be a condensate pump.

[0045] In embodiments of the present invention, a water-based absorbent, rather than pure water, is used as the medium in the steam power cycle system. This water-based absorbent can be formed by uniformly dissolving a certain concentration of salt in water. This salt solution exhibits absorption properties, namely, its saturated vapor pressure is lower than that of pure water at the same temperature, and its temperature is higher than that of pure water at the same saturated vapor pressure. Condenser 130 employs a hybrid direct condensation structure. Concentrated brine is sprayed into condenser 130, where it directly condenses with steam discharged from turbine 120 to form dilute brine. After pressurization, a portion of the dilute brine discharged from condenser 130 passes through a membrane distillation separation device to produce concentrated brine and pure water. The pure water enters steam generator 110 to generate high-temperature steam, which then enters turbine 120 for expansion and work. The concentrated brine mixes with the remaining brine discharged from condenser 130 to form concentrated brine. This brine is cooled in heat exchanger 210 and then sprayed back into condenser 130. Simultaneously, heat is transferred via heat exchanger 210 to the organic working fluid of the organic Rankine cycle system for power generation.

[0046] While maintaining a constant steam pressure within condenser 130 and maintaining the power output of steam turbine 120, the water temperature within condenser 130 can be significantly increased. The organic working fluid Rankine cycle system 200 utilizes the energy of the high-temperature water in a cascaded manner, thereby increasing the overall thermal efficiency of the steam power cycle system. This embodiment of the present invention leverages both the established steam Rankine cycle system and the organic working fluid Rankine cycle system 200. It can be implemented based on existing power plant steam Rankine cycle systems with only minor modifications. Equipment such as the steam turbine 120, steam generator 110, and second pumping unit 150 require no modifications. Equipment such as the condenser 130 and third pumping unit 160 only require component-level material replacement, replacing the medium with a water-based absorbent (e.g., a saline solution). This can be accomplished by adding an organic working fluid Rankine cycle system 200 and a membrane distillation separation unit.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A high-efficiency steam power cycle system with cascaded energy utilization, characterized in that: include: Steam cycle system and organic working fluid Rankine cycle system; The steam cycle system includes a steam generator, a steam turbine, a condenser, and a separation device, wherein the separation device is provided with a first outlet and a second outlet; the outlet of the steam generator, the steam turbine, the condenser, the inlet of the separation device, the first outlet, and the inlet of the steam generator are sequentially connected; The organic working medium Rankine cycle system includes a heat exchanger having a water-based absorbent inlet and a water-based absorbent outlet; the water-based absorbent outlet, the condenser inlet, the separator inlet, the second outlet and the water-based absorbent inlet are sequentially connected; The separation device is used to separate the mixed liquid discharged from the condenser into water and a water-based absorbent solution; Water flows to the steam generator through the first outlet, and the water-based absorbent solution flows to the heat exchanger through the second outlet.

2. The high-efficiency steam power cycle system with cascaded energy utilization according to claim 1 is characterized in that: The outlet of the condenser is in communication with the water-based absorbent inlet.

3. The high-efficiency steam power cycle system with cascaded energy utilization according to claim 2, characterized in that: The organic working fluid Rankine cycle system further includes a turbine, and the heat exchanger further has an organic working fluid inlet and an organic working fluid outlet. The organic working fluid outlet, the turbine and the organic working fluid inlet are sequentially connected; the turbine is used to convert thermal energy into mechanical energy or electrical energy.

4. The high-efficiency steam power cycle system with cascaded energy utilization according to claim 3 is characterized in that: The organic working medium Rankine cycle system further includes a cooler, the inlet of the cooler is communicated with the outlet of the turbine, and the outlet of the cooler is communicated with the inlet of the organic working medium.

5. The high-efficiency steam power cycle system with cascaded energy utilization according to claim 4 is characterized in that: The organic working medium Rankine cycle system further includes a first pumping element, which is provided between the outlet of the cooler and the organic working medium inlet.

6. The high-efficiency steam power cycle system with cascaded energy utilization according to claim 1 is characterized in that: The steam circulation system further includes a second pumping member disposed between the first outlet and the steam generator.

7. The high-efficiency steam power cycle system with cascaded energy utilization according to claim 1 is characterized in that: An adjusting member is provided between the outlet of the condenser and the inlet of the water-based absorbent or between the inlet of the separation device.

8. The high-efficiency steam power cycle system with cascaded energy utilization according to claim 1 is characterized in that: The steam circulation system further includes a third pumping member, an inlet of the third pumping member is communicated with the outlet of the condenser, and an outlet of the third pumping member is communicated with the inlet of the water-based absorbent and the inlet of the separation device respectively.

9. The high-efficiency steam power cycle system with cascaded energy utilization according to claim 1, characterized in that: The water-based absorbent includes a saline solution.

10. The high-efficiency steam power cycle system with cascaded energy utilization according to claim 1, characterized in that: The separation device comprises a membrane distillation separation device.

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