TWI750607B - Method of using eutectic salt phase change material and clay preparation device - Google Patents

Abstract

The invention discloses a method for using a device for preparing a phase change material of eutectic salt and clay, comprising a stirring tank, wherein the stirring tank includes a tank body, a manhole, a speed-regulating motor, a gear reducer, a stirring shaft and an expansion oil tank , electric heater, down-pressure paddle, thermometer and control cabinet, the present invention is provided with the oxidant lauric acid. Compared with the oxidant n-decanoic acid, the latent heat of phase transition of the oxidant lauric acid is obviously increased, and the oxidant lauric acid is added. The eutectic salt phase change material of clay can play the role of phase change energy storage under different temperature conditions; by setting the eutectic salt phase change material in the present invention, the application temperature is from -114 degrees Celsius to +164 degrees Celsius, which can be suitable for many For cooling and heating applications, the stored cold/heat energy is used to offset the peak power consumption during the day. Compared with its physical size, it has a large thermal energy storage capacity. The air pressure is 0.55kPa and the temperature is 200℃. Biodegradation does not occur under relative vacuum, and it does not expand and contract during solid-liquid phase transition.

Description

Phase change material of eutectic salt and method of using clay preparation device

The invention relates to the technical field of preparation methods for eutectic salts, in particular to a method for using a device for preparing a phase change material of eutectic salts and clay.

With the rapid development of China's economy, the demand for electricity is also growing very rapidly. In particular, the gap between the peak and trough of electricity consumption in a day is constantly widening, and the uneven operation of the power grid is becoming more and more serious. Overload, in order to ensure the safe operation of the power grid, the Ministry of Electric Power can only limit the power supply, which affects the use of users. In addition, it has to invest huge amounts of money to build power stations to meet the needs of power supply; when electricity is used in low valleys, the production capacity of power generation and transmission equipment is large and serious. Excess and waste lead to inefficient operation of the power grid and rising costs. Because electricity has the characteristic that power generation, transmission, distribution and use occur at the same instant, that is, the inherent characteristic that electricity cannot be stored in large quantities, there is excess power generation during the day and night. The phenomenon of waste that cannot be stored; China's electricity distribution is very uneven, some areas have sufficient electricity, some areas have poor electricity, large cities and industrial areas have insufficient electricity during the day and excess electricity at night; as long as the electricity is fully and reasonably utilized, the country will Benefit, users will also benefit. The higher the power utilization rate, the lower the cost, and to solve the problem of unbalanced power load, the power sector gradually implements peak-shaving and valley-filling measures.

In the 1970s, taking the worldwide energy crisis as an opportunity, some developed countries successively introduced some advanced cold storage technologies as a means of power peak regulation. At this stage, energy is still in a tense period, especially the power consumption of urban air conditioners is basically in the peak period of power load, which is destined to become cold storage. It is an important field of technology application. Therefore, air-conditioning cold storage technology can play the role of shifting peaks and filling valleys by storing cold during the trough period of electricity consumption at night and releasing cold during the peak period of electricity consumption during the day, so as to alleviate the contradiction between power supply and demand and save operation. Cost to obtain good environmental benefits.

Aiming at the deficiencies of the prior art, the present invention provides a method for using a eutectic salt phase change material and a clay preparation device, which solves the problem that the gap between the peak and the valley of electricity consumption is constantly widening, and the uneven operation of the power grid is becoming more and more serious. When electricity is used, the power generation and transmission equipment is seriously overloaded. In order to ensure the safe operation of the power grid, the Ministry of Electric Power can only limit the power supply, which affects the use of users. The production capacity of power generation and transmission equipment is seriously excessive and wasted, resulting in low operating efficiency of the power grid and rising costs. Because electricity has the characteristic that electricity generation, transmission, distribution and use occur at the same instant, that is, electricity cannot be stored in large quantities. During the day and night, there is a waste of excess power generation that cannot be stored.

In order to achieve the above purpose, the present invention provides the following technical solutions: a preparation device and method for a phase change material of a eutectic salt and clay, including a stirring tank, and the stirring tank includes a tank body, a manhole, a speed regulating motor, and a gear deceleration. machine, stirring shaft, expansion oil tank, electric heater, push-down paddle, temperature gauge and control cabinet, the manhole is welded on the upper end of the tank body; the speed regulating motor and the gear reducer are connected by bolts , and connected with the control cabinet by wires; the gear reducer is installed on the top of the tank by bolts; the stirring shaft and the output shaft of the gear reducer are connected by a coupling, and the lower end extends into the tank The expansion oil tank is installed on one side of the upper end of the tank body by a flange; the electric heater adopts at least two, which are embedded on the side wall of the stirring tank and are connected with the control cabinet by wires; down pressure At least one type paddle is used, all of which are connected with the stirring shaft; the temperature gauge is threaded on one side of the top of the tank; the control cabinet is connected with the mains by wires.

A method of using a eutectic salt phase change material and a clay preparation device includes the following steps: Step 1: put the clay and water into a stirring tank, and heat it to 90°C by an electric heater; Step 2: mix the liquid The inorganic salt phase change material is put into the stirring tank, and the gear reducer is driven to rotate by the speed regulating motor, so that the downward pressure paddle installed on the stirring shaft is stirred, and heated to 200 ° C by the electric heater; step Step 3: Add the oxidant lauric acid to the inorganic hydrated salt phase change material, so that the phase change temperature of the inorganic hydrated salt phase change material is 5~55°C above zero to obtain a mixed solution A; Step 4: Add the mixed solution A into the stirring tank , vacuumize the mixing tank until the vacuum pressure is less than or equal to 0.55MPa; Step 5: Add clay with a particle size of less than 2 μm into the mixing tank to completely immerse the clay, keep the working pressure less than or equal to 0.55MPa, and the working temperature at 200°C The standing time is 5~10min, the pressure is eliminated, the pressure is less than or equal to 0.55MPa to normal pressure, and then filtered to obtain the eutectic salt phase change material.

In the third step, the inorganic hydrated salt phase change materials are: 4H ₂ ONH ₄ Cl, Na ₂ B ₄ O ₇ . 10H ₂ O, KCl, Al ₂ O ₃ . 2SiO ₂ . 2H ₂ O, Al ₂ [(OH) ₄ |Si ₂ O ₅ ]. nH ₂ O,(Al,Mg) ₂ [(OH) ₂ |Si ₄ O ₁₀ ](Na,Ca) _x ． nH ₂ O,(Mg,Ca) _0.31 (H ₂ O) _n {Ti _0.18 Al _0.03 Fe(III) _1.09 Mg _1.25 [Si _2.80 Al _1.20 O ₁₀ (OH) ₂ ]},K _0.65 Al _2.0 Al _0.65 Si _3.35 O ₁₀ (OH) ₂ , Al ₂ O ₃ . SiO ₂ . _{2.5H 2 O, C 12 H 24} O.

The clay in the fifth step is a hydrous aluminosilicate product, including kaolinite, petrolatum, montmorillonite, vermiculite and illite.

The preparation method of the liquid mixed inorganic salt phase change material is as follows: the mixed inorganic salt phase change material and the oxidant lauric acid are put into a stirring tank, and heated to 90 by an electric heater under normal pressure. ℃, then adjust the working pressure to 0.55kPa, adjust the working pressure time to 10min, and then make a liquid mixed inorganic salt phase change material under the action of negative pressure.

The 100% ratio of each weight component in the eutectic salt phase change material in the step 5 is: water 40%, ammonium chloride 13%, sodium tetraborate hydrate 10%, potassium chloride 20%, clay 16%, oxidant Lauric acid 1%.

The invention provides a preparation device and method for a phase change material of eutectic salt and clay. Has the following beneficial effects:

(1) In the present invention, by setting the oxidant lauric acid, compared with the oxidant n-decanoic acid, the latent heat of phase change of the oxidant lauric acid is significantly increased, and the eutectic salt phase change material of the clay can be used under different temperature conditions. Play the role of phase change energy storage.

(2) By setting the eutectic salt phase change material, the application temperature of the present invention is from -114 degrees Celsius to +164 degrees Celsius, which can be suitable for many cooling and heating applications, and the stored cold/heat energy can offset the peak during the day. Power consumption, relative to its physical size, it has a large thermal energy storage capacity, and will not biodegrade under a relative vacuum of 0.55kPa at a pressure of 0.55kPa and a temperature of 200°C. Does not expand and contract.

(3) By setting clay and using clay as an additive, the present invention will not separate into layers during the solid-liquid phase transition process, has plasticity, has high latent heat of phase transition, and can exert phase transition storage at multiple temperatures It can solve the problem that the latent heat of phase change is smaller than that of ice, and its cold storage capacity is larger than that of water.

1: mixing tank

11: Tank

12: Manhole

13: Speed regulating motor

14: Gear reducer

15: Stirring shaft

16: Expansion oil tank

17: Electric heater

18: Down pressure paddles

19: Thermometer

20: Control cabinet

Figure 1 is a schematic diagram of the stirring tank mechanism of the present invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present invention.

Example 1

As shown in Figure 1, the present invention provides a technical solution: a preparation device and method for a phase change material of a eutectic salt and clay, the preparation device for a phase change material of a eutectic salt and clay comprises a stirring tank, the said The mixing tank includes a tank body, a manhole, a speed regulating motor, a gear reducer, a stirring shaft, an expansion oil tank, an electric heater, a push-down paddle, a temperature gauge and a control cabinet. The manhole is welded on the upper end of the tank body. ; The speed regulating motor is connected with the gear reducer by bolts, and is connected with the control cabinet by wires; the gear reducer is installed on the top of the tank by bolts; the stirring shaft is connected with the gear reducer The output shaft is connected by a coupling, and the lower end extends to the inside of the tank body; the expansion oil tank is installed on one side of the upper end of the tank body by a flange; at least two electric heaters are used, which are embedded in the stirring tank. The side wall of the tank is connected with the control cabinet by wires; at least one of the push-down paddles is used, and all of them are connected with the stirring shaft; the temperature gauge is threaded on one side of the top of the tank; so The control cabinet described above is connected to the mains by wires.

Example 2

A method for using a phase change material of eutectic salt and a device for preparing clay comprises the following steps: Step 1: put the clay and water into a stirring tank, and heat it to 90° C. by an electric heater; Step 2: Put the liquid mixed inorganic salt phase change material into the stirring tank, and drive the gear reducer to rotate by the speed regulating motor, so that the downward pressure paddle installed on the stirring shaft is stirred, and heated by electricity. The device is heated to 200 ℃; step 3: add the oxidant lauric acid to the inorganic hydrated salt phase change material, so that the phase change temperature of the inorganic hydrated salt phase change material is 5~55 ℃ above zero to obtain mixed solution A; step 4: add The mixture A is added into the mixing tank, and the mixing tank is evacuated until the vacuum pressure is less than or equal to 0.55MPa; Step 5: Add clay with a particle size of less than 2 μm into the mixing tank to completely immerse the clay and keep the working pressure less than or equal to 0.55MPa, the working temperature is 200℃, the standing time is 5~10min, the pressure is eliminated, the pressure is less than or equal to 0.55MPa to normal pressure, and then filtered to obtain the eutectic salt phase change material.

Preferably, the inorganic hydrated salt phase change material in the third step is: 4H ₂ ONH ₄ Cl, Na ₂ B ₄ O ₇ . 10H ₂ O, KCl, Al ₂ O ₃ . 2SiO ₂ . 2H ₂ O, Al ₂ [(OH) ₄ |Si ₂ O ₅ ]. nH ₂ O,(Al,Mg) ₂ [(OH) ₂ |Si ₄ O ₁₀ ](Na,Ca) _x ． nH ₂ O,(Mg,Ca) _0.31 (H ₂ O) _n {Ti _0.18 Al _0.03 Fe(III) _1.09 Mg _1.25 [Si _2.80 Al _1.20 O ₁₀ (OH) ₂ ]},K _0.65 Al _2.0 Al _0.65 Si _3.35 O ₁₀ (OH) ₂ , Al ₂ O ₃ . SiO ₂ . _{2.5H 2 O, C 12 H 24} O.

Example 3

A method of using a eutectic salt phase change material and a clay preparation device includes the following steps: Step 1: put the clay and water into a stirring tank, and heat it to 90°C by an electric heater; Step 2: mix the liquid The inorganic salt phase change material is put into the stirring tank, and the gear reducer is driven to rotate by the speed regulating motor, so that the downward pressure paddle installed on the stirring shaft is stirred, and heated to 200 ° C by the electric heater; step Three: adding the oxidant lauric acid to the inorganic hydrated salt phase-change material, so that the phase-change temperature of the inorganic hydrated salt phase-change material is 5-55°C above zero to obtain mixed solution A; Step 4: Add the mixed solution A into the stirring tank, and evacuating the stirring tank until the vacuum pressure is less than or equal to 0.55MPa; The working pressure is less than or equal to 0.55MPa, the working temperature is 200 ℃ and the standing time is 5~10min, the pressure is eliminated, and the pressure is less than or equal to 0.55MPa to normal pressure, and then filtered to obtain the eutectic salt phase change material.

Preferably, the clay in the fifth step is a hydrous aluminosilicate product, including kaolinite, petrolatum, montmorillonite, vermiculite and illite.

Example 4

A method of using a eutectic salt phase change material and a clay preparation device includes the following steps: Step 1: put the clay and water into a stirring tank, and heat it to 90°C by an electric heater; Step 2: mix the liquid The inorganic salt phase change material is put into the stirring tank, and the gear reducer is driven to rotate by the speed regulating motor, so that the downward pressure paddle installed on the stirring shaft is stirred, and heated to 200 ° C by the electric heater; step Step 3: Add the oxidant lauric acid to the inorganic hydrated salt phase change material, so that the phase change temperature of the inorganic hydrated salt phase change material is 5~55°C above zero to obtain a mixed solution A; Step 4: Add the mixed solution A into the stirring tank , vacuumize the mixing tank until the vacuum pressure is less than or equal to 0.55MPa; Step 5: Add clay with a particle size of less than 2 μm into the mixing tank to completely immerse the clay, keep the working pressure less than or equal to 0.55MPa, and the working temperature at 200°C The standing time is 5~10min, the pressure is eliminated, the pressure is less than or equal to 0.55MPa to normal pressure, and then filtered to obtain the eutectic salt phase change material.

Preferably, the preparation method of the liquid mixed inorganic salt phase change material is as follows: put the mixed inorganic salt phase change material and the oxidant lauric acid into a stirring tank, and add the mixed inorganic salt phase change material under normal pressure by an electric heater. Heat to 90°C, adjust the working pressure to 0.55kPa, adjust the working pressure for 10 minutes, and then make a liquid mixed inorganic salt phase change material under the action of negative pressure.

Example 5

A method of using a eutectic salt phase change material and a clay preparation device includes the following steps: Step 1: put the clay and water into a stirring tank, and heat it to 90°C by an electric heater; Step 2: mix the liquid The inorganic salt phase change material is put into the stirring tank, and the gear reducer is driven to rotate by the speed regulating motor, so that the downward pressure paddle installed on the stirring shaft is stirred, and heated to 200 ° C by the electric heater; step Step 3: Add the oxidant lauric acid to the inorganic hydrated salt phase change material, so that the phase change temperature of the inorganic hydrated salt phase change material is 5~55°C above zero to obtain a mixed solution A; Step 4: Add the mixed solution A into the stirring tank , vacuumize the mixing tank until the vacuum pressure is less than or equal to 0.55MPa; Step 5: Add clay with a particle size of less than 2 μm into the mixing tank to completely immerse the clay, keep the working pressure less than or equal to 0.55MPa, and the working temperature at 200°C The standing time is 5~10min, the pressure is eliminated, the pressure is less than or equal to 0.55MPa to normal pressure, and then filtered to obtain the eutectic salt phase change material.

Preferably, the 100% ratio of each weight component in the eutectic salt phase change material in the step 5 is: water 40%, ammonium chloride 13%, sodium tetraborate hydrate 10%, potassium chloride 20%, clay 16%, oxidant lauric acid 1%.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and variations, the scope of the invention is defined by the appended claims and their equivalents.

1: mixing tank

11: Tank

12: Manhole

13: Speed regulating motor

14: Gear reducer

15: Stirring shaft

16: Expansion oil tank

17: Electric heater

18: Down pressure paddles

19: Thermometer

20: Control cabinet

Claims (5)

A method for using a device for preparing a phase change material of a eutectic salt and clay, the device for preparing a phase change material of a eutectic salt and clay comprising a stirring tank (1), the stirring tank (1) comprising a tank body (11) , manhole (12), a speed regulating motor (13), gear reducer (14), stirring shaft (15), expansion oil tank (16), electric heater (17), pressing paddle (18), The temperature gauge (19) and the control cabinet (20), the manhole (12) is welded on the upper end of the tank body (11); the speed regulating motor (13) and the gear reducer (14) are connected by bolts, and Connected with the control cabinet (20) by wires; the gear reducer (14) is mounted on the top of the tank (11) by bolts; the stirring shaft (15) and the output shaft of the gear reducer (14) Connected by a coupling, the lower end extends to the inside of the tank body (11); the expansion oil tank (16) is mounted on one side of the upper end of the tank body (11) by means of a flange; the electric heater (17) at least adopts 2, which are embedded on the side wall of the stirring tank (1), and are connected with the control cabinet (20) by wires; at least one of the down-pressing paddles (18) is used, both of which are connected to the stirring shaft (15). ) is matched and connected; the thermometer (19) is screwed on one side of the top of the tank body (11); the control cabinet (20) is connected with the mains by wires, wherein: the use method includes the following steps: Step 1: Put clay and water into the stirring tank (1), and heat it to 90°C by the electric heater (17); Step 2: put a liquid mixed inorganic salt phase change material into the stirring tank (1) Inside, the gear reducer (14) is driven to rotate by the speed regulating motor (13), so that the downward pressure paddle (18) installed on the stirring shaft (15) is stirred, and heated by the electric The device (17) is heated to 200°C; step 3: adding the oxidant lauric acid to an inorganic hydrated salt phase change material, so that the The phase change temperature of the inorganic hydrated salt phase change material is 5 to 55°C above zero to obtain a mixed solution A; Step 4: add the mixed solution A into the stirring tank (1), and vacuum the stirring tank (1) until The vacuum degree pressure is less than or equal to 0.55MPa; Step 5: Add clay with a particle size of less than 2 μm in the stirring tank (1), so that the clay is completely immersed, keep the working pressure less than or equal to 0.55MPa, and the working temperature is 200 ℃ for a standing time of 5~ 10min, eliminate the pressure, make the pressure less than or equal to 0.55MPa to normal pressure, and then filter to obtain the eutectic salt phase change material. The method for using a eutectic salt phase change material and a clay preparation device according to claim 1, wherein: in the third step, the inorganic hydrated salt phase change material is: 4H ₂ ONH ₄ Cl, Na ₂ B ₄ O ₇ . 10H ₂ O, KCl, Al ₂ O ₃ . 2SiO ₂ . 2H ₂ O, Al ₂ [(OH) ₄ |Si ₂ O ₅ ]. nH ₂ O,(Al,Mg) ₂ [(OH) ₂ |Si ₄ O ₁₀ ](Na,Ca) _x ． nH ₂ O,(Mg,Ca) _0.31 (H ₂ O) _n {Ti _0.18 Al _0.03 Fe(III) _1.09 Mg _1.25 [Si _2.80 Al _1.20 O ₁₀ (OH) ₂ ]},K _0.65 Al _2.0 Al _0.65 Si _3.35 O ₁₀ (OH) ₂ , Al ₂ O ₃ . SiO ₂ ． _{2.5H 2 O, C 12 H 24} O. The method for using a device for preparing a eutectic salt phase change material and clay as claimed in claim 1, wherein: the clay in step 5 is a hydrous aluminosilicate product, comprising: kaolinite, petrolatum, montmorillonite Stone, Vermiculite and Illite. The method for using a device for preparing a eutectic salt phase change material and clay as claimed in claim 1, wherein: the liquid state mixed inorganic salt phase change material preparation method is: mixing the mixed inorganic salt phase change material and the oxidant lauryl The acid is put into the stirring tank (1), heated to 90°C by the electric heater (17) under normal pressure, and then the working pressure is adjusted to 0.55kPa, and the time for adjusting the working pressure is 10 minutes, and then the mixture is prepared under the action of negative pressure. into the liquid mixed inorganic salt phase change material. The phase change material of the eutectic salt according to claim 1 and the device for preparing clay The use method, wherein: the 100% ratio of each weight component in the eutectic salt phase change material in step 5 is: water 40%, ammonium chloride 13%, sodium tetraborate hydrate 10%, potassium chloride 20%, clay 16%, oxidant lauric acid 1%.

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