CN102746677A - Electric heating energy storage material and preparation method thereof - Google Patents
Electric heating energy storage material and preparation method thereof Download PDFInfo
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- CN102746677A CN102746677A CN2012102435511A CN201210243551A CN102746677A CN 102746677 A CN102746677 A CN 102746677A CN 2012102435511 A CN2012102435511 A CN 2012102435511A CN 201210243551 A CN201210243551 A CN 201210243551A CN 102746677 A CN102746677 A CN 102746677A
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- electric heating
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- heating energy
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- carbon nanofiber
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Abstract
The invention discloses an electric heating energy storage material and a preparation method of the electric heating energy storage material, and relates to an energy storage material and the preparation method of the energy storage material. The problem that the conventional electric heating energy storage material needs higher heating temperature and an additional heating unit is solved. The electric heating energy storage material consists of a wax and a carbon nanofiber, wherein the doping quantity of the carbon nanofiber is 0.1-5 percent by mass of the wax. The preparation method comprises the following steps of: heating and thawing the wax; adding the carbon nanofiber into the thawed wax for mechanically stirring for 1-5 minutes; ultrasonically dispersing the mixture for 15-60 minutes at the temperature of 70-90 DEG C; and cooling the mixture to prepare the electric heating energy storage material. The carbon nanofiber has good conductivity and higher length-diameter ratio; and moreover, the carbon nanofiber is compounded with the wax under the smaller doping quantity so as to have the good conductivity property. The electric heating energy storage material and the preparation method can be applied to the field of electric heating energy storage.
Description
Technical field
The present invention relates to a kind of energy storage material and preparation method thereof.
Background technology
It is the problem that the whole world is concerned about that energy is preserved, and wherein the electric energy preservation is the aspect of an important among energy is preserved.A major issue of over-drastic energy requirement and low peak interval lower energy requirement having become electrical energy fed aspect because this not only can reduce the end-use performance of generating set, and can be ordered about electrovalent rising during the peak of power consumption.Using the electric heating memory technology to heat is an effective way that solves this complicated power supply-needs of problems.The electric heating memory technology is that the electric energy with the electricity consumption ebb converts heat energy into and the heat energy of this low price is stored, and during peak of power consumption, heat energy is discharged then and warms oneself.Because electric energy converts the efficient of heat energy near a hundred per cent, the electric heating storage is very efficiently.The electric heating storage has reduced the demand to the peak of power consumption electric energy, therefore can alleviate the contradiction of power tense, also can reduce resident's electricity cost.In addition, electric heating energy-storage can also utilize renewable energy sources such as sun power or wind energy.
The most frequently used electric heating energy-storage system comprises electric heating unit and heat-storing medium two portions.Traditional hot storage media is to have the ceramic tile that high heat keeps performance.Existing report, the ceramic tile of 78 kilogram weights is heated to 760 degrees centigrade, can store the roughly heat energy of 4000 kilojoules.Because ceramic tile has low thermal capacitance, and non-conductive, the electric heating storage system of using the ceramic tile preparation mainly contains two shortcomings: the hot storage capacity that needs higher Heating temperature to need with realization needs extra electric heating unit to carry out electrically heated.
Summary of the invention
The objective of the invention is and provides a kind of electric heating energy-storage material and preparation method thereof in order to solve the higher Heating temperature of existing electric heating storage medium needs and to need the unitary problem of extra-heated.
A kind of electric heating energy-storage material of the present invention is made up of wax and carbon nanofiber, and wherein, the carbon nanofiber volume is 0.1% ~ 5% of a wax amount.
A kind of electric heating energy-storage preparation methods of the present invention; Carry out according to following steps: wax is heated to 70 ℃ ~ 90 ℃ melts, treat that wax melts fully after, add carbon nanofiber; Mechanical stirring 1 ~ 5min; Carry out ultra-sonic dispersion 15 ~ 60min at 70 ℃ ~ 90 ℃ then, be cooled to normal temperature then, promptly get the electric heating energy-storage material; Wherein, the carbon nanofiber volume is 0.1% ~ 5% of a wax amount.
The present invention comprises following beneficial effect:
Electric heating storage medium of the present invention is to adopt the preparation of carbon nanofiber compound wax.Because carbon nanofiber has excellent conducting performance, and has higher length-to-diameter ratio, itself and wax are compound under the less volume promptly has a good conductance property.Do not need higher Heating temperature just can have good thermal storage performance, and the present invention only is made up of carbon nanofiber and wax, do not need the extra-heated unit.
Carbon nano-tube fibre of the present invention is at the inner conductive network that is communicated with that forms of wax; Thereby make the compound prepared material of carbon nanofiber and wax have the favorable conductive characteristic; This matrix material integral body can be regarded a resistance as, in through electric current, can carry out from heating.And ceramic tile electric heating energy-storage material need be laid extra wire spiral and heat in ceramic tile.In addition, carbon nanofiber is at the inner favorable conductive network that forms of wax, and whole material can be regarded as uniformly, so matrix material can heat up equably during electrically heated, and the intensification of ceramic tile electric heating energy-storage material internal material is uneven.In addition, wax has higher heat storage capacity, and ceramic tile has low heat storage capacity, and ceramic tile need just have high quantity of heat storage under the very high situation of Heating temperature, but too high Heating temperature has potential to threaten to the person and property safety in use.Therefore, this composite material concurrent can be realized high hot store content from heating and lower Heating temperature.This material can be set in traditional electric heating storage system, also can be set in the body of wall of dwelling house.
Description of drawings
Fig. 1 carries out the ultrasonic Performance Detection histogram to resistivity of different time for the electric heating energy-storage material;
Fig. 2 carries out the relationship detection graphic representation of carbon nanofiber volume and resistivity for the electric heating energy-storage material;
Fig. 3 carries out from heating energy-storage property and storage heat energy release performance detection curve figure for the electric heating energy-storage material; Wherein, curve 1 is for heat energy storage and energy storage exotherm certainly, and curve 2 is the interior temperature variation curve of the enclosed space of electric heating energy-storage material.
Embodiment
Technical scheme of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: a kind of electric heating energy-storage material of this embodiment is made up of wax and carbon nanofiber, and wherein, the carbon nanofiber volume is 0.1% ~ 5% of a wax amount.
The carbon nanofiber of this embodiment is bought from U.S. Pyrograf Products ltd.
The wax of this embodiment is paraffin, buys from U.S. Candlewic company.
The electric heating storage medium of this embodiment is to adopt the preparation of carbon nanofiber compound wax.Because carbon nanofiber has excellent conducting performance, and has higher length-to-diameter ratio, itself and wax are compound under the less volume promptly has a good conductance property.Do not need higher Heating temperature just can have good thermal storage performance, and the present invention only is made up of carbon nanofiber and wax, do not need the extra-heated unit.
The carbon nano-tube fibre of this embodiment is at the inner conductive network that is communicated with that forms of wax; Thereby the compound prepared material of carbon nanofiber and wax has the favorable conductive characteristic; This matrix material integral body can be regarded a resistance as, in through electric current, can carry out from heating.And ceramic tile electric heating energy-storage material need be laid extra wire spiral and heat in ceramic tile.In addition, carbon nanofiber is at the inner favorable conductive network that forms of wax, and whole material can be regarded as uniformly, so matrix material can heat up equably during electrically heated, and the intensification of ceramic tile electric heating energy-storage material internal material is uneven.In addition, wax has higher heat storage capacity, and ceramic tile has low heat storage capacity, and ceramic tile need just have high quantity of heat storage under the very high situation of Heating temperature, but too high Heating temperature has potential to threaten to the person and property safety in use.Therefore, this composite material concurrent can be realized high hot store content from heating and lower Heating temperature.This material can be set in traditional electric heating storage system, also can be set in the body of wall of dwelling house.
Embodiment two: what this embodiment and embodiment one were different is: described wax is paraffin.Other is identical with embodiment one.
Embodiment three: what this embodiment and embodiment one to two were different is: the carbon nanofiber volume is 1% ~ 3% of a wax amount.Other is identical with embodiment one to two.
Embodiment four: what this embodiment was different with one of embodiment one to three is: the carbon nanofiber volume is 2% of a wax amount.Other is identical with one of embodiment one to three.
Embodiment five: a kind of electric heating energy-storage preparation methods of this embodiment; Carry out according to following steps: wax is heated to 70 ℃ ~ 90 ℃ melts, treat that wax melts fully after, add carbon nanofiber; Mechanical stirring 1 ~ 5min; Carry out ultra-sonic dispersion 15 ~ 60min at 70 ℃ ~ 90 ℃ then, be cooled to normal temperature then, promptly get the electric heating energy-storage material; Wherein, the carbon nanofiber volume is 0.1% ~ 5% of a wax amount.
The carbon nanofiber of this embodiment is bought from U.S. Pyrograf Products ltd.
The wax of this embodiment is paraffin, buys from U.S. Candlewic company.
The electric heating storage medium of this embodiment is to adopt the preparation of carbon nanofiber compound wax.Because carbon nanofiber has excellent conducting performance, and has higher length-to-diameter ratio, itself and wax are compound under the less volume promptly has a good conductance property.Do not need higher Heating temperature just can have good thermal storage performance, and the present invention only is made up of carbon nanofiber and wax, do not need the extra-heated unit.
The carbon nano-tube fibre of this embodiment is at the inner conductive network that is communicated with that forms of wax; Thereby the compound prepared material of carbon nanofiber and wax has the favorable conductive characteristic; This matrix material integral body can be regarded a resistance as, in through electric current, can carry out from heating.And ceramic tile electric heating energy-storage material need be laid extra wire spiral and heat in ceramic tile.In addition, carbon nanofiber is at the inner favorable conductive network that forms of wax, and whole material can be regarded as uniformly, so matrix material can heat up equably during electrically heated, and the intensification of ceramic tile electric heating energy-storage material internal material is uneven.In addition, wax has higher heat storage capacity, and ceramic tile has low heat storage capacity, and ceramic tile need just have high quantity of heat storage under the very high situation of Heating temperature, but too high Heating temperature has potential to threaten to the person and property safety in use.Therefore, this composite material concurrent can be realized high hot store content from heating and lower Heating temperature.This material can be set in traditional electric heating storage system, also can be set in the body of wall of dwelling house.
Embodiment six: what this embodiment and embodiment five were different is: described wax is paraffin.Other is identical with embodiment five.
Embodiment seven: what this embodiment and embodiment five to six were different is: the carbon nanofiber volume is 1% ~ 3% of a wax amount.Other and embodiment five to six phase are together.
Embodiment eight: what this embodiment was different with one of embodiment five to seven is: the carbon nanofiber volume is 2% of a wax amount.Other is identical with one of embodiment five to seven.
Embodiment nine: what this embodiment was different with one of embodiment five to eight is: the ultrasonic frequency of described ultra-sonic dispersion is 20 ~ 100kHz.Other is identical with one of embodiment five to eight.
Through following verification experimental verification effect of the present invention:
The preparation method of the electric heating storage medium of this test is: the heating paraffin to 80 of 100g ℃ is melted, treat that wax melts fully after, add the carbon nanofiber of 1.5g; Mechanical stirring 1min; Carry out ultra-sonic dispersion 15min at 80 ℃ then, be cooled to normal temperature then, promptly get the electric heating energy-storage material.
Electric heating energy-storage material to this test obtains is tested; Test shows; 30.5kJ the electric energy input electric heating storage medium at ambient temperature about 1 hour that can make this test about 100g; Temperature is warmed up to 70 ℃ from 25 ℃, and the electric heating storage capacity of promptly prepared electric heating storage medium is 280kJ/kg, and this numerical value is apparently higher than traditional ceramics brick electric heating storage capacity 54kJ/kg (ceramic tile about 100g is warmed up to 70 ℃ from 25 ℃ only can heat energy storage 4kJ).Under 25 ℃ room temperature condition, the electric heating storage medium that is heated to about 70 ℃ 100g is positioned over 4000cm
3Enclosed space in, can make that maximum temperature rise is higher than 9 ℃ in the enclosed space; After 7 hours, the temperature in the enclosed space is still high 1.5 ℃ than room temperature.
The carbon nanofiber of this test is bought from U.S. Pyrograf Products ltd.
The paraffin of this test is bought from U.S. Candlewic company.
The carbon nanofiber performance that this test is adopted is as shown in table 1, and the performance of paraffin is as shown in table 2.
Table 1 adopts the performance perameter of carbon nanofiber
Table 2 adopts the performance of paraffin
The electric heating energy-storage material that this test obtains and the comparative result of ceramic tile performance are as shown in table 3; Can know by table 3; The hot storage capacity of the electric heating energy-storage material of this test is far superior to traditional ceramic tile, on Heating temperature, again well below traditional ceramic tile, explains that the electric heating energy-storage material of this test has good heat storage capacity; Do not need higher Heating temperature, can reach good thermal storage performance.
The comparison of table 3 electric heating energy-storage material and traditional ceramics brick performance
The electric heating energy-storage material that this test is obtained carries out the ultrasonic Performance Detection to resistivity of different time; The result is as shown in Figure 1; Can know by Fig. 1; The electric heating energy-storage material that this test obtains is under the supersound process of 15 ~ 60min, and carbon nanofiber can be evenly dispersed among the wax, has good resistivity.
The electric heating energy-storage material that this test is obtained carries out the relationship detection of carbon nanofiber volume and resistivity, and the result is as shown in Figure 2, by shown in Figure 2, is 0.5 ~ 2% o'clock at the carbon nanofiber volume, has good electrical conductivity.
The electric heating energy-storage material that this test is obtained carries out detecting with storage heat energy release performance from heating energy-storage property; The result is as shown in Figure 3; Among the figure rising part of curve 1 for matrix material behind the electric heating energy-storage material making alive that this test about 100g obtains from heating curve; The input electric energy is that 30.5kJ can make the electric heating energy-storage material at ambient temperature about 1 hour, and temperature is warmed up to 70 ℃ from 25 ℃.After the sloping portion of curve 1 was close current among the figure, prepared electric heating energy-storage material was placed on 4000cm
3The dispose procedure of the heat energy stored of enclosed space, curve 2 is 4000cm
3Enclosed space in temperature variation, can know by Fig. 3, under 25 ℃ room temperature condition, be heated to electric heating energy-storage material about 70 ℃ 100g and be positioned over and can make its inner maximum temperature rise be higher than 9 ℃ in the enclosed space; After 7 hours, the temperature in the enclosed space is still high 1.5 ℃ than room temperature.Explain that the electric heating energy-storage material that this test obtains has good thermal storage performance.
Claims (9)
1. electric heating energy-storage material is characterized in that the electric heating energy-storage material is made up of wax and carbon nanofiber, and wherein, the carbon nanofiber volume is 0.1% ~ 5% of a wax amount.
2. a kind of electric heating energy-storage material according to claim 1 is characterized in that described wax is paraffin.
3. a kind of electric heating energy-storage material according to claim 1 is characterized in that the carbon nanofiber volume is 1% ~ 3% of a wax amount.
4. a kind of electric heating energy-storage material according to claim 1 and 2 is characterized in that the carbon nanofiber volume is 2% of a wax amount.
5. a kind of electric heating energy-storage preparation methods as claimed in claim 1; It is characterized in that a kind of electric heating energy-storage preparation methods carries out according to following steps: wax is heated to 70 ℃ ~ 90 ℃ melts, treat that wax melts fully after, add carbon nanofiber; Mechanical stirring 1 ~ 5min; Carry out ultra-sonic dispersion 15 ~ 60min at 70 ℃ ~ 90 ℃ then, be cooled to normal temperature then, promptly get the electric heating energy-storage material; Wherein, the carbon nanofiber volume is 0.1% ~ 5% of a wax amount.
6. a kind of electric heating energy-storage preparation methods according to claim 5 is characterized in that described wax is paraffin.
7. a kind of electric heating energy-storage preparation methods according to claim 5 is characterized in that the carbon nanofiber volume is 1% ~ 3% of a wax amount.
8. a kind of electric heating energy-storage preparation methods according to claim 5 is characterized in that the carbon nanofiber volume is 2% of a wax amount.
9. a kind of electric heating energy-storage preparation methods according to claim 5, the ultrasonic frequency that it is characterized in that described ultra-sonic dispersion is 20 ~ 100kHz.
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Citations (3)
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|---|---|---|---|---|
| CN1834190A (en) * | 2005-03-19 | 2006-09-20 | 清华大学 | Thermal dielectric surface material and prepn. process |
| CN101407714A (en) * | 2008-09-16 | 2009-04-15 | 上海第二工业大学 | Paraffinic based carbon nano-tube compound phase transformation heat accumulating material and preparation thereof |
| CN102517793A (en) * | 2011-12-15 | 2012-06-27 | 江南大学 | Method for enhancing thermal conductivity of phase-change energy-storage superfine composite polyamide fiber and method for producing phase-change energy-storage superfine composite polyamide fiber |
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Patent Citations (3)
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|---|---|---|---|---|
| CN1834190A (en) * | 2005-03-19 | 2006-09-20 | 清华大学 | Thermal dielectric surface material and prepn. process |
| CN101407714A (en) * | 2008-09-16 | 2009-04-15 | 上海第二工业大学 | Paraffinic based carbon nano-tube compound phase transformation heat accumulating material and preparation thereof |
| CN102517793A (en) * | 2011-12-15 | 2012-06-27 | 江南大学 | Method for enhancing thermal conductivity of phase-change energy-storage superfine composite polyamide fiber and method for producing phase-change energy-storage superfine composite polyamide fiber |
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| Title |
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| 《Carbon》 20050902 Ahmed Elgafy, et al. Effect of carbon nanofiber additives on thermal behavior of phase change materials 第3068页第2栏第3段第1-4行和第4段第1-2行 5-9 第43卷, 第15期 * |
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Application publication date: 20121024 |