CN111690380A - Circulating working medium for phase-change heat exchanger and application thereof - Google Patents
Circulating working medium for phase-change heat exchanger and application thereof Download PDFInfo
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
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- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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Abstract
The invention discloses a cycle medium for a phase-change heat exchanger and application thereof. The circulating working medium for the phase-change heat exchanger is a hygroscopic aqueous solution; the solute of the hygroscopic aqueous solution comprises a halogenated inorganic salt and/or a polyhydric alcohol; when the solute of the hygroscopic aqueous solution comprises the halogenated inorganic salt, the concentration of the halogenated inorganic salt is 5-50%, and the concentration of the halogenated inorganic salt is the ratio of the mass of the halogenated inorganic salt to the mass of the hygroscopic aqueous solution; when the solute of the hygroscopic aqueous solution contains the polyhydric alcohol, the concentration of the polyhydric alcohol is 60 to 95%, and the concentration of the polyhydric alcohol is a ratio of the mass of the polyhydric alcohol to the mass of the hygroscopic aqueous solution. The invention takes the hygroscopic water solution as the circulating working medium of the phase-change heat exchanger, has larger temperature adaptation range, good adjustability, high working pressure resistance level and high heat exchange efficiency, and can stably operate in wider different pressure and temperature ranges.
Description
Technical Field
The invention relates to a cycle working medium for a phase-change heat exchanger and application thereof.
Background
At present, most of the phase-change heat exchangers in China adopt organic homogeneous mixtures such as water or Freon and the like as the circulating working media of the phase-change heat exchangers. Under normal pressure, the boiling point of water is 100 ℃, the freezing point is 0 ℃, and the temperature of a heat source and a cold source cannot be too high or too low. And the boiling point of Freon or other refrigerant circulating working media is relatively low. In the phase change process of the phase change heat exchanger, the liquid phase concentration is constant, the vapor pressure and the saturation temperature are often constant or higher, and the phase change heat exchanger cannot adapt to heat source and cold source heat exchange processes in different ranges. Meanwhile, organic matters such as Freon and the like serving as circulating media can pollute the environment, are inflammable, explosive, toxic and harmful, and have high requirement on the air tightness of the whole phase-change heat exchanger. When the temperature of an external heat source or cold source changes greatly, the heat exchange balance of the whole phase change heat exchanger is seriously influenced.
Therefore, a cycle working medium is sought, and the technical problems of the phase-change heat exchanger are solved, which is urgent.
Disclosure of Invention
The invention provides a circulating working medium for a phase-change heat exchanger and application thereof, aiming at overcoming the defects of narrow temperature adaptation range, poor adjustability, low working pressure-resistant grade and poor heat exchange efficiency when water and Freon are used as the circulating working medium of the phase-change heat exchanger in the prior art. The invention takes the hygroscopic water solution as the circulating working medium of the phase-change heat exchanger, has larger temperature adaptation range, good adjustability, high working pressure resistance level and high heat exchange efficiency, and can stably operate in wider different pressure and temperature ranges.
The technical problem of the present invention is mainly solved by the following technical solutions.
The invention provides a cycle working medium for a phase-change heat exchanger, which is a hygroscopic aqueous solution;
the solute of the hygroscopic aqueous solution comprises a halogenated inorganic salt and/or a polyol;
when the solute of the hygroscopic aqueous solution comprises the halogenated inorganic salt, the concentration of the halogenated inorganic salt is 5-50%, and the concentration of the halogenated inorganic salt is the ratio of the mass of the halogenated inorganic salt to the mass of the hygroscopic aqueous solution;
when the solute of the hygroscopic aqueous solution contains the polyhydric alcohol, the concentration of the polyhydric alcohol is 60 to 95%, and the concentration of the polyhydric alcohol is a ratio of the mass of the polyhydric alcohol to the mass of the hygroscopic aqueous solution.
In the invention, the phase-change heat exchanger is known to those skilled in the art to exchange heat in an indirect contact manner. The hygroscopic water solution is used as a filler for independent phase change circulation, does not contact with a heat exchange material, and only transfers heat. The hygroscopic aqueous solution does not corrode the internal structure of the phase-change heat exchanger, has good stability and wide application field, and can also achieve higher heat exchange coefficient. If the concentration of the hygroscopic aqueous solution in the present invention is not within the above-defined range, the heat exchange efficiency or heat exchange coefficient, and the pressure-resistant grade are greatly reduced.
In the present invention, the total number of the kinds of the halogenated inorganic salt and/or the polyol in the hygroscopic aqueous solution may be 1 or 2. Compared with hygroscopic water solution containing various solutes, the stability is better.
In the present invention, the kind of the halogenated inorganic salt may be a halogenated inorganic salt conventionally used in the art for preparing a hygroscopic aqueous solution. Preferably one or a mixture of two or more of sodium bromide, lithium chloride and magnesium chloride. Such as lithium bromide or magnesium chloride.
In the present invention, the kind of the polyol may be a polyol conventionally used in the art for preparing a hygroscopic aqueous solution. Preferably one or a mixture of two or more of ethylene glycol, glycerol and triethylene glycol. Such as ethylene glycol.
In the present invention, the concentration of the halogenated inorganic salt is preferably 15 to 45%, for example, 20%, 25%, 30% or 35%, and the concentration is a ratio of the mass of the halogenated inorganic salt to the mass of the hygroscopic aqueous solution.
In a preferred embodiment of the present invention, the solute of the hygroscopic aqueous solution is magnesium chloride, and the concentration of the magnesium chloride is 10 to 35% by mass, which is the ratio of the mass of the magnesium chloride to the mass of the hygroscopic aqueous solution.
In a preferred embodiment of the present invention, the solute of the hygroscopic aqueous solution is lithium bromide, and the concentration of the lithium bromide is 10 to 45%, for example, 20%, 25%, 30%, or 35%, and the concentration is a ratio of the mass of the lithium bromide to the mass of the hygroscopic aqueous solution.
In a preferred embodiment of the present invention, the solute of the hygroscopic aqueous solution is magnesium chloride and lithium bromide, and the mass ratio of the magnesium chloride to the lithium bromide is 0.5:1, the total concentration of the magnesium chloride and the lithium bromide is 5-35%, for example 15% or 25%, and the concentration refers to the ratio of the total mass of the magnesium chloride and the lithium bromide to the mass of the hygroscopic aqueous solution.
In the present invention, when the solute of the hygroscopic aqueous solution is a polyol, the concentration of the polyol is preferably 70 to 95%, for example, 70 to 80% or 80 to 90%, and the concentration refers to the ratio of the mass of the polyol to the mass of the hygroscopic aqueous solution.
In a preferred embodiment of the present invention, the solute in the hygroscopic aqueous solution is ethylene glycol, and the concentration of the ethylene glycol is 70 to 95%, for example, 80%, and the concentration is a ratio of the mass of the ethylene glycol to the mass of the hygroscopic aqueous solution.
In a preferred embodiment of the present invention, when the solute of the hygroscopic aqueous solution is triethylene glycol, the concentration of the triethylene glycol is 60 to 85%, for example, 70% or 80%, and the concentration is a ratio of the mass of the triethylene glycol to the mass of the hygroscopic aqueous solution.
In a preferred embodiment of the present invention, the solute of the hygroscopic aqueous solution is ethylene glycol and lithium chloride, and the mass ratio of the ethylene glycol to the lithium chloride is (0.5 to 1): 2.
in the present invention, a surfactant or a corrosion inhibitor, which is conventional in the art, may be added to the hygroscopic aqueous solution according to actual needs by those skilled in the art.
Wherein, in the hygroscopic aqueous solution, the ratio of the mass of the surfactant to the total mass of the hygroscopic aqueous solution is preferably 0.1 to 0.01 percent, for example 1 to 2 per thousand;
wherein, the surfactant is preferably sodium dodecyl sulfate.
When the hygroscopic aqueous solution contains sodium dodecyl sulfate, the ratio of the mass of the sodium dodecyl sulfate to the mass of the hygroscopic aqueous solution is preferably 0.1 to 2%, for example, 1 to 2%.
In the present invention, the solute of the hygroscopic aqueous solution is preferably a halogenated inorganic salt and sodium dodecylsulfate; the concentration of the halogenated inorganic salt is 15-35%, the concentration of the sodium dodecyl sulfate is 0.1-2 per thousand, the type of the halogenated inorganic salt is one or a mixture of two of sodium bromide, lithium chloride and magnesium chloride, and the concentration is the ratio of the mass of each solute to the mass of the hygroscopic aqueous solution.
In a preferred embodiment of the present invention, the solute of the hygroscopic aqueous solution is preferably lithium bromide and sodium dodecyl sulfate; the concentration of the lithium bromide is 35%, the concentration of the sodium dodecyl sulfate is 1-2 thousandths, and the concentration is the ratio of the mass of each solute to the mass of the hygroscopic aqueous solution.
In the present invention, the solute of the hygroscopic aqueous solution is preferably a polyhydric alcohol and sodium dodecylsulfate; the concentration of the polyhydric alcohol is 70-95%, the concentration of the sodium dodecyl sulfate is 0.1-2 thousandths, the type of the polyhydric alcohol is ethylene glycol and/or triethylene glycol, and the concentration is the ratio of the mass of each solute to the mass of the hygroscopic aqueous solution.
In a preferred embodiment of the present invention, the solute of the hygroscopic aqueous solution is preferably ethylene glycol and sodium dodecyl sulfate; the concentration of the ethylene glycol is 80%, the concentration of the sodium dodecyl sulfate is 1-2 thousandths, and the concentration is the ratio of the mass of each solute to the mass of the hygroscopic aqueous solution.
The invention also provides application of the hygroscopic aqueous solution as the circulating working medium of the phase-change heat exchanger, wherein the hygroscopic aqueous solution is as described above.
In the present invention, the phase-change heat exchanger may be a conventional phase-change heat exchanger in the art. Generally comprising an evaporation section and a condensation section. The evaporator or condenser in the evaporation section or the condensation section can be one or more of a shell and tube type, a spiral tube type, a plate type and a finned tube type.
Wherein, the heat source of the evaporation section can be a heat source conventional in the field. The temperature of the heat source is preferably 5 to 20 ℃ higher than the evaporation temperature of the hygroscopic aqueous solution.
The type of the heat source of the evaporation section can be high-temperature flue gas, hot steam, electric heating or high-temperature hot water. When the heat source is high-temperature flue gas, the temperature of the high-temperature flue gas is preferably higher than 100 ℃.
Wherein, the cold source of the condensation segment can be a cold source conventional in the field. Such as demineralized water, process water or heating water.
Wherein, the flow of the cold source of the condensation segment can be the flow of the cold source conventional in the field. For example 100 kg/h.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows: the invention takes the specific hygroscopic aqueous solution as the circulating working medium of the phase-change heat exchanger, and has the advantages of large and stable temperature adaptation range, good adjustability and high working pressure resistance level. The circulating working medium has the advantages of common market, low price, safe and nontoxic running working medium, simple preparation, low corrosivity and low requirement on equipment tightness, has important application value in the field of heat exchangers, and is suitable for large-scale popularization and application.
Drawings
Fig. 1 is a schematic view of the working structure of the phase change heat exchanger in embodiments 1 to 7.
FIG. 2 is a schematic view of fins on the outer wall of the inner heat pipe in the evaporation section in embodiments 1 to 7.
Description of reference numerals: a heat pipe 1; a heat pipe evaporation section 11; a heat pipe condensation section 12; a fin 13; an evaporator 3; a condenser 4; a hygroscopic aqueous solution 5; water vapor 6; steam condensate 7; a heat source inlet a; a heat source outlet b; a cold source inlet c; and a cold source outlet d.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
The structure of the phase change heat exchanger used in the following embodiments 1 to 7 is shown in fig. 1 and 2, and is a heat pipe heat exchanger, which includes a heat pipe evaporation section and a heat pipe condensation section, each of which is provided with an evaporator and a condenser, the evaporation section is provided with a heat source inlet a and a heat source outlet b, and the condensation section is provided with a cold source inlet c and a cold source outlet d. The inner diameter of a heat pipe in the heat pipe exchanger is DN32, the heat pipe 1 is a finned pipe, the length of fins 13 is 10mm, the distance between the fins 13 is 1mm, the length of the heat pipe 1 is 500mm, and steam (0.1-1.0 Mpa) is used as the heat source temperature of the evaporation section 11. The temperature of the heat source is 100-350 ℃, is 5-20 ℃ higher than the evaporation temperature of the corresponding hygroscopic water solution 5, the temperature of the cold source is 40-80 ℃ of heating water, and the flow rate of the cold source is 100 kg/h.
Example 1
In this embodiment, the circulating working medium for the phase-change heat exchanger is a mixed aqueous solution of magnesium chloride and lithium bromide, and the mass ratio of the magnesium chloride to the lithium bromide is 0.5: 1. Mixed aqueous solutions of different concentrations, 5%, 15%, 25%, 35%, respectively, were prepared and labeled as solutions A, B, C, D, referring to the total concentration of magnesium chloride and lithium bromide. And respectively placing the circulating working media with different concentrations in the heat pipe of the phase-change heat exchanger. The hygroscopic water solution 5 is heated and boiled under the evaporation of a heat source to generate steam 6, flows upwards in the heat pipe, is cooled by a cold source of a condensation section of the heat pipe to become steam condensate 7, and flows downwards under the action of gravity to return to the evaporation section. The hygroscopic aqueous solution at a certain concentration maintains relatively stable evaporation temperature and saturated vapor pressure, and then the pressure resistance grade and the evaporation temperature are tested.
The temperature of the heating water in this embodiment is set to 45 ℃, and then the related evaporation and condensation experiments of the heat pipe are performed, and the related experimental data are recorded.
The formula of the cycle fluid used for the phase change heat exchanger in the embodiments 2 to 5 is shown in the following table 1.
TABLE 1
| Solute | Concentration of | |
| Example 2 | Magnesium chloride | 10～35％ |
| Example 3 | Ethylene glycol | 60～95％ |
| Example 4 | Triethylene glycol | 60～85％ |
| Example 5 | Lithium bromide | 10～45％ |
Example 6
In example 5, sodium dodecylbenzenesulfonate is added in an amount of 1 to 2% by mass based on 35% of lithium bromide. The control group was an aqueous solution of lithium bromide with 35% of the cycle fluid of example 5. In the embodiment, the temperature of the evaporation section can be reduced by about 3-5 ℃, the solution is light yellow, and the evaporation boiling time is shortened compared with that of the control group. Compared with the heat exchange efficiency of the control group, the heat exchange efficiency is improved by 10-30%.
Example 7
In example 3, sodium dodecylbenzenesulfonate is added in an amount of 1 to 2% by mass based on 80% ethylene glycol concentration. The ethylene glycol aqueous solution with 80% of the cycle fluid in example 3 was used as a control. In this example, the temperature in the evaporation zone was reduced by about 4 ℃ and the evaporation boiling time was reduced compared to the control. Compared with the control group, the heat exchange efficiency is improved by 20 percent.
The heat exchange efficiency in the above embodiments 6 and 7 is the comprehensive heat exchange coefficient of the heat pipe heat exchanger, and the heat exchange load and the heat exchange temperature difference are obtained by measuring under the same heat pipe heat exchanger at the same cold source flow rate and the same inlet temperature, wherein Q is KA Δ T, Q is the total heat exchange load, K is the medium heat transfer coefficient, and Δ T is the heat exchange temperature difference, and the heat pipe heat exchange coefficient K is obtained as the comparison index.
Effect example 1
1. Testing of withstand voltage rating
For the phase-change heat exchangers in which the circulating mediums with different concentrations were placed in examples 1, 3, 4, and 7, the evaporation and condensation experiments of the heat pipe were performed at the same temperature, and the pressure in the heat pipe was detected, and the test results are shown in table 2 below. Wherein A, B, C and D correspond to concentrations of 60%, 70%, 80% and 95% for example 3, respectively. Example 4 corresponds to concentrations of 60%, 70%, 80% and 95%, respectively. Example 7 corresponds to concentrations of 60%, 70%, 80% and 95%, respectively.
TABLE 2
As can be seen from Table 2, the saturated water vapor partial pressure of the evaporation experiments of the circulating working media with different concentrations is greatly reduced compared with that of water at the same temperature. And the pressure resistance grade of the phase-change heat exchanger is further improved. Wherein, 15-35% of the cycle working medium of the halogenated inorganic salt water solution and 60-95% of the polyhydric alcohol water solution or the polyhydric alcohol water solution added with the sodium dodecyl sulfate can meet the cycle requirement of the phase-change heat exchanger, and the operation is stable. Within this range, the higher the solution concentration, the lower the saturated vapor pressure, and the easier the heat pipe condensation stage will proceed at the same temperature. However, when the above-mentioned circulation fluids are not within the scope of the present invention (for example, when the total concentration of the circulation fluid exceeds 50% in example 1), the condensation section begins to have a few crystallization points, which affects the operation of the entire phase-change heat exchanger.
2. Measurement of boiling and freezing temperatures
Experimental records were carried out at the heat pipe evaporation temperature and the crystallization temperature of the hygroscopic aqueous solutions of examples 1 to 7 at a certain concentration under phase pressure, and the test results are shown in table 3 below.
TABLE 3
As can be seen from table 3, the hygroscopic aqueous solutions in the certain ranges in examples 1 to 7 can greatly broaden the heat exchange temperature of the phase change heat exchanger. Under the same pressure, the heat exchanger can meet different heat exchange requirements. In examples 6 and 7, sodium dodecylsulfate was added to examples 5 and 3, respectively, and it can be seen from table 3 above that the addition of sodium dodecylsulfate has little effect on the temperature ranges of the boiling point and the freezing point of the hygroscopic aqueous solution.
3. Measurement of Heat transfer coefficient
The comprehensive heat exchange coefficient of the heat pipe heat exchanger is measured under the same heat pipe heat exchanger under the same cold source flow and inlet temperature, the heat exchange load and the heat exchange temperature difference are obtained, Q is KA delta T, Q is the total heat exchange load, K is the medium heat transfer coefficient, and delta T is the heat exchange temperature difference, and the heat pipe heat exchange coefficient K is obtained.
The heat pipe heat exchangers in embodiments 3 to 5 are used, the cold source is constant temperature water of 25 ℃, 100kg/h is used as the cold source medium of the heat pipe heat exchanger, the pyrogen is saturated steam of 0.4MPa, and the heat pipe evaporation and condensation experiment is performed, so that the overall heat exchange coefficients of the heat pipe heat exchangers under different concentrations of the ethylene glycol aqueous solution are shown in the following table 4.
TABLE 4
| Example 3 | Concentration of ethylene glycol aqueous solution | 60％ | 70％ | 80％ | 95％ | 100％ |
| Heat transfer coefficient W/m2.k | 220 | 350 | 560 | 450 | 180 | |
| Example 4 | Concentration of triethylene glycol aqueous solution | 60％ | 70％ | 80％ | 85％ | 96％ |
| Heat transfer coefficient W/m2.k | 200 | 330 | 500 | 430 | 150 | |
| Example 5 | Concentration of lithium bromide aqueous solution | 10％ | 20％ | 30％ | 45％ | 55％ |
| Heat transfer coefficient W/m2.k | 550 | 500 | 600 | 520 | 300 |
In experiments, the inventor finds that if the concentration of the ethylene glycol aqueous solution or the triethylene glycol aqueous solution is lower than 60% and higher than 95%, and the concentration of the lithium bromide aqueous solution is higher than 50%, the heat exchange coefficient is remarkably reduced, and the use requirement cannot be met.
The experiments of the above embodiments ensure that the flow of cold and heat sources is consistent, the phase-change heat exchanger is consistent, strict comparison experiments are carried out, and the experiments are repeated repeatedly, so that the conclusion is reliable, and the method has theoretical and practical significance for the technical application of the phase-change heat exchanger.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. A cycle working medium for a phase-change heat exchanger is characterized in that the cycle working medium is a hygroscopic aqueous solution;
the solute of the hygroscopic aqueous solution comprises a halogenated inorganic salt and/or a polyol;
when the solute of the hygroscopic aqueous solution comprises the halogenated inorganic salt, the concentration of the halogenated inorganic salt is 5-50%, and the concentration of the halogenated inorganic salt is the ratio of the mass of the halogenated inorganic salt to the mass of the hygroscopic aqueous solution;
when the solute of the hygroscopic aqueous solution contains the polyhydric alcohol, the concentration of the polyhydric alcohol is 60 to 95%, and the concentration of the polyhydric alcohol is the ratio of the mass of the polyhydric alcohol to the mass of the hygroscopic aqueous solution.
2. The working fluid for phase-change heat exchanger as claimed in claim 1, wherein the halogenated inorganic salt is one or a mixture of two or more of sodium bromide, lithium chloride and magnesium chloride, such as lithium bromide or magnesium chloride;
the polyol is one or more of ethylene glycol, glycerol and triethylene glycol, such as ethylene glycol or triethylene glycol.
3. The working fluid for phase-change heat exchanger according to claim 1 or 2, wherein the concentration of the halogenated inorganic salt is 15-45%, such as 20%, 25%, 30% or 35%, and the concentration is the ratio of the mass of the halogenated inorganic salt to the mass of the hygroscopic aqueous solution.
4. The working fluid for phase-change heat exchanger as claimed in claim 1 or 2, wherein the concentration of the polyhydric alcohol is 70 to 95%, such as 70 to 80% or 80 to 90%, the concentration being the ratio of the mass of the polyhydric alcohol to the mass of the hygroscopic aqueous solution.
5. The working fluid for phase-change heat exchanger according to claim 4, wherein when the polyhydric alcohol is ethylene glycol, the concentration of the ethylene glycol is 70 to 95%, such as 70% or 80%, the concentration being the ratio of the mass of the ethylene glycol to the mass of the hygroscopic aqueous solution;
when the polyhydric alcohol is triethylene glycol, the concentration of the triethylene glycol is 60 to 85%, for example, 70% or 80%, and the concentration refers to the ratio of the mass of the triethylene glycol to the mass of the hygroscopic aqueous solution.
6. The working fluid circulation for the phase-change heat exchanger as claimed in any one of claims 1 to 5, wherein the hygroscopic aqueous solution further comprises a surfactant or a corrosion inhibitor;
wherein, in the hygroscopic aqueous solution, the ratio of the mass of the surfactant to the total mass of the hygroscopic aqueous solution is preferably 0.1 to 0.01 percent, for example 1 to 2 per thousand;
wherein, the surfactant is preferably sodium dodecyl sulfate.
7. The working fluid for phase-change heat exchanger as claimed in claim 6, wherein the solute of the hygroscopic aqueous solution is halogenated inorganic salt and sodium dodecyl sulfate; the concentration of the halogenated inorganic salt is 15-35%, the concentration of the sodium dodecyl sulfate is 0.1-2 per thousand, the type of the halogenated inorganic salt is one or a mixture of two of sodium bromide, lithium chloride and magnesium chloride, and the concentration is the ratio of the mass of each solute to the mass of the hygroscopic aqueous solution;
or the solute in the hygroscopic water solution is polyalcohol and sodium dodecyl sulfate; the concentration of the polyhydric alcohol is 70-95%, the concentration of the sodium dodecyl sulfate is 0.1-2 thousandths, the type of the polyhydric alcohol is ethylene glycol and/or triethylene glycol, and the concentration is the ratio of the mass of each solute to the mass of the hygroscopic aqueous solution.
8. The working fluid circulation for phase change heat exchangers according to claim 6 wherein the solutes in the hygroscopic aqueous solution are lithium bromide and sodium dodecyl sulfate; the concentration of the lithium bromide is 35%, the concentration of the sodium dodecyl sulfate is 1-2 per mill, and the concentration is the ratio of the mass of each solute to the mass of the hygroscopic aqueous solution;
or the solute in the hygroscopic water solution is glycol and sodium dodecyl sulfate; the concentration of the ethylene glycol is 80%, the concentration of the sodium dodecyl sulfate is 1-2 thousandths, and the concentration is the ratio of the mass of each solute to the mass of the hygroscopic aqueous solution.
9. The application of the hygroscopic aqueous solution as the circulating working medium of the phase-change heat exchanger is characterized in that the hygroscopic aqueous solution is the hygroscopic aqueous solution as claimed in any one of claims 1 to 8.
10. The use according to claim 9, wherein the phase-change heat exchanger comprises an evaporator section and a condenser section;
wherein the evaporator or condenser in the evaporation section or the condensation section is preferably one or more of a shell and tube type, a spiral tube type, a plate type and a finned tube type;
the type of the heat source of the evaporation section is preferably high-temperature flue gas, hot steam, electric heating or high-temperature hot water;
the type of the cold source of the condensation section is preferably desalted water, process water or heating water.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114874753A (en) * | 2021-07-29 | 2022-08-09 | 东南大学 | Saturated vapor pressure temperature sensitive dehumidifying solution |
| CN114874753B (en) * | 2021-07-29 | 2024-05-10 | 东南大学 | Saturated vapor pressure temperature-sensitive dehumidifying solution |
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