CN108219751A - A kind of phase-change heat-storage material and preparation method applied to the solar energy drying of wood - Google Patents
A kind of phase-change heat-storage material and preparation method applied to the solar energy drying of wood Download PDFInfo
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- CN108219751A CN108219751A CN201611154080.1A CN201611154080A CN108219751A CN 108219751 A CN108219751 A CN 108219751A CN 201611154080 A CN201611154080 A CN 201611154080A CN 108219751 A CN108219751 A CN 108219751A
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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Abstract
The invention discloses a kind of phase-change heat-storage material applied to the solar energy drying of wood and preparation method thereof, which is prepared by stearic acid and expanded graphite by mechanical mixture and melting absorption method.Solar energy phase-change heat storage material prepared by the method, stearic acid can be effectively filled in the hole of expanded graphite, and expanded graphite is compound rear that chemical change does not occur with stearic acid；The thawing of composite material and solidification phase transition temperature are respectively 52.74 DEG C and 53.70 DEG C, melt and solidification latent heat of phase change is respectively 169.90 J/g and 166.10 J/g；It is in a slight decrease compared with stearic acid, still meet practical application request.The composite phase-change heat-storage material of preparation has good thermal cycling stability after 500 times and 1000 hot SAPMAC methods.Compared with stearic acid, 39.74% and 45.09% has been respectively shortened in the composite phase-change heat-storage material storage of preparation, Exotherm Time, effectively increases the storing discharging thermal efficiency.The addition of expanded graphite improves stearic acid heat release unevenness problem.
Description
Technical field
The present invention relates to a kind of solar energy phase-change heat storage material, specifically a kind of phase transformation applied to the solar energy drying of wood
Heat accumulating and preparation method thereof.
Background technology
In recent years, increasingly serious with the worsening shortages of fossil energy and environmental pollution, energy conservation and environmental protection utilizes new energy
One of hot subject as present age research.The drying of wood is a necessary links of timber industry production, in actual production
It is the highest link of energy consumption in timber processing largely using heat-force dry in journey.Therefore the variation of the drying of wood from now on
It may not be the methods of the drying of wood, and should be that the continuous of the required energy changes so as to influence entirely to dry industry.
Solar energy is a kind of cleaning, free of contamination regenerative resource, but due to regional influence, China's solar energy resources
In different regions, the amount of radiation of solar energy is also different, and wherein western Tibet solar energy resources enrich and the ground such as Sichuan and Chongqing the most
Area's solar energy resources are then relatively deficient.In addition round the clock with the alternating in season, the randomness for causing solar energy resources is larger, available
It measures unstable.In today that Green Development theory is rooted in the hearts of the people, solar energy heat utilization technology is for timber industry energy conservation and environmental protection
It is of great significance.The stability and reliability of Solar Energy Heat Utilization System are improved, heat-storage technology becomes indispensable.At present I
State's solar energy heat-storage technology focuses mostly in low temperature and high-temperature heat-storage field, and the application in solar energy drying field is less.Storage
Hot material is core and the basis of heat-storage technology.Therefore it researches and develops suitable for the novel heat accumulating of the solar energy drying of wood, for
The energy utilization rate for improving drying system and the energy consumption for reducing traditional timber industry are of great significance.
Invention content
The object of the present invention is to provide a kind of solar energy drying of wood water tank phase-change heat-storage material, the phase transformations of the heat accumulating
Temperature matches with the operating temperature of solar energy drying of wood heat storage water tank, and latent heat of phase change is higher, no supercooling and phenomenon of phase separation,
The storing discharging thermal efficiency is high, and thermal stability is good.
The purpose of the present invention is achieved through the following technical solutions：A kind of phase transformation applied to the solar energy drying of wood
Heat accumulating is as follows：The phase-change heat-storage material is combined by stearic acid and expanded graphite, stearic acid and expansion
The ratio of graphite is 6:1-11:1, mechanical agitation 20min after the two mixing, it is to be mixed uniformly after put it into -0.1MPa, 75 DEG C
Vacuum drying chamber in adsorb 12h, and primary every stirring in 2 hours, stir 2min every time.It is cooled to room temperature, obtains tristearin
Acid/expanded graphite composite phase-changing heat storage material.The composite phase-change material of preparation melts and solidification phase transition temperature is respectively 52.66-
52.77 DEG C and 53.66-53.77 DEG C；Melt and solidification latent heat of phase change is respectively 165.10-173.60 J/g and 158.20-
168.60J/g。
Wherein, used expanded graphite is that 12 h are dried in vacuo under conditions of 60 DEG C by inflatable crystalline flake graphite.Often
It is secondary weigh 2-3g and may expand crystalline flake graphite be placed in high-temperature ceramic copple, 60 s are heat-treated in 800 DEG C of Muffle furnaces, are prepared
Loose porous expanded graphite.
Wherein, the mixed proportion of stearic acid and expanded graphite is 6:1-11:1, optimal mixed proportion is 9:1.
Wherein, stearic acid/expanded graphite composite phase-changing heat storage material obtained is encapsulated in solar heat storage water tank, led to
Storage heat test is crossed to be detected.
Phase-change thermal storage technology is that the storage of energy is carried out using the latent heat of phase-change material, and the present invention uses phase-change thermal storage skill
Stearic acid and expanded graphite are prepared a kind of phase-change thermal storage efficiently, stable by art by way of melt blending, physical absorption
Material, compared with prior art, the present invention have the following advantages.
（1）The phase-change heat-storage material packaging effect is good, and uniformly absorption in the hole of expanded graphite, has no stearic acid
Stearic acid group more than needed is gathered in its surface, does not leak.The phase structure of stearic acid and expanded graphite is preserved preferably, after compound
Chemical change does not occur and generates novel substance, there is good chemical stability.
（2）The phase-change heat-storage material can apply in the solar heat storage water tank of the drying of wood, effectively increase water storage
The emission capacity of case improves the thermal efficiency of solar energy heat-storage.Meanwhile the volume and cost of heat-storing device can be reduced, improve heat accumulation
The economic benefit of system.
（3）The addition of expanded graphite to composite material decomposition have certain inhibiting effect, composite material 180 DEG C with
There is good thermal stability, suitable for solar energy drying system when lower.Experiments have shown that in solar radiation intensity deficiency,
Phase-change thermal storage drying room temperature is apparently higher than common water tank heat accumulation drying room temperature, and hothouse diurnal temperature in arid cycle
Amplitude of variation is substantially reduced.
Specific embodiment
Embodiment 1：Stearic acid and expanded graphite are pressed 6:1 ratio mixing, mechanical agitation 20min is carried out by mixture,
It is to be mixed uniformly after put it into 0.1MPa, adsorb 12h in 75 DEG C of vacuum drying chamber, and primary every stirring in 2 hours.Cooling
To room temperature, palmitic acid/expanded graphite composite phase-changing heat storage material is obtained.The composite material of preparation melts and solidification phase transition temperature
Respectively 52.66 DEG C and 52.20 DEG C；Melt and solidification latent heat of phase change is respectively 165.10J/g and 158.20J/g.It does not find to ooze
Leakage has good packaging effect.
Embodiment 2：Stearic acid and expanded graphite are pressed 9:1 ratio mixing, mechanical agitation 20min is carried out by mixture,
It is to be mixed uniformly after put it into 0.1MPa, adsorb 12h in 75 DEG C of vacuum drying chamber, and primary every stirring in 2 hours.Cooling
To room temperature, stearic acid/expanded graphite composite phase-changing heat storage material is obtained.The composite material of preparation melts and solidification phase transition temperature
Respectively 52.74 DEG C and 53.70 DEG C；Melt and solidification latent heat of phase change is respectively 169.90J/g and 166.10 J/g.It does not find to ooze
Leakage has good packaging effect.Consider the latent heat of phase change and packaging effect of composite material, select stearic acid and expansion stone
The optimum quality ratio of ink is 9：1, it obtains suitable for the sizing phase-change heat-storage material of the solar energy drying of wood.
Embodiment 3：Stearic acid and expanded graphite are pressed 10:1 ratio mixing, mechanical agitation 20min is carried out by mixture,
It is to be mixed uniformly after put it into 0.1MPa, adsorb 12h in 75 DEG C of vacuum drying chamber, and primary every stirring in 2 hours.Cooling
To room temperature, stearic acid/expanded graphite composite phase-changing heat storage material is obtained.The composite material of preparation melts and solidification phase transition temperature
Respectively 52.76 DEG C and 53.68 DEG C；Melt and solidification latent heat of phase change is respectively 171.50 J/g and 167.20 J/g.Composite wood
Material leaks.
Embodiment 4：Stearic acid and expanded graphite are pressed 11:1 ratio mixing, mechanical agitation 20min is carried out by mixture,
It is to be mixed uniformly after put it into 0.1MPa, adsorb 12h in 75 DEG C of vacuum drying chamber, and primary every stirring in 2 hours.Cooling
To room temperature, stearic acid/expanded graphite composite phase-changing heat storage material is obtained.The composite material of preparation melts and solidification phase transition temperature
Respectively 52.77 DEG C and 53.66 DEG C；Melt and solidification latent heat of phase change is respectively 173.60 J/g and 168.60 J/g.Composite wood
Material leaks.
Claims (4)
1. a kind of phase-change heat-storage material applied to the solar energy drying of wood, it is characterised in that：The phase-change heat-storage material is by tristearin
Acid and expanded graphite are combined, and the ratio of stearic acid and expanded graphite is 6:1-11:1, mechanical agitation after the two mixing
20min, it is to be mixed uniformly after put it into -0.1MPa, adsorb 12h in 75 DEG C of vacuum drying chamber, and one was stirred every 2 hours
It is secondary, 2min is stirred every time；It is cooled to room temperature, obtains stearic acid/expanded graphite composite phase-changing heat storage material.
2. a kind of preparation of phase-change heat-storage material applied to the solar energy drying of wood according to claim 1, feature
It is：Used expanded graphite is that 12 h are dried in vacuo under conditions of 60 DEG C by inflatable crystalline flake graphite；Weigh 2- every time
3g may expand crystalline flake graphite and be placed in high-temperature ceramic copple, is heat-treated 60s in Muffle furnace under the conditions of 800 DEG C, is prepared
Loose porous expanded graphite.
3. a kind of preparation of phase-change heat-storage material applied to the solar energy drying of wood according to claim 1, feature
It is：Stearic acid is mixed with expanded graphite, mixed proportion 6:1-11:1, optimal mixed proportion is 9:1.
4. a kind of preparation of phase-change heat-storage material applied to the solar energy drying of wood according to claim 1, feature
It is：Stearic acid/expanded graphite composite phase-changing heat storage material obtained is encapsulated in solar heat storage water tank, carries out storage heat
Experiment；The composite material thawing and solidification phase transition temperature for measuring preparation are respectively 52.66-52.77 DEG C and 53.66-53.77 DEG C；
Melt and solidification latent heat of phase change is respectively 165.10-173.60 J/g and 158.20-168.60J/g.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611154080.1A CN108219751A (en) | 2016-12-14 | 2016-12-14 | A kind of phase-change heat-storage material and preparation method applied to the solar energy drying of wood |
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| CN201611154080.1A CN108219751A (en) | 2016-12-14 | 2016-12-14 | A kind of phase-change heat-storage material and preparation method applied to the solar energy drying of wood |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100999657A (en) * | 2006-12-22 | 2007-07-18 | 华南理工大学 | Organism/expansion graphite composite phase transformation heat storaging material and preparation process and heat storing apparatus thereof |
| CN101239798A (en) * | 2008-01-04 | 2008-08-13 | 华南理工大学 | Organic matter/expandable graphite composite phase change heat-storing building material and preparation method thereof |
| CN105627804A (en) * | 2016-02-23 | 2016-06-01 | 上海交通大学 | Modular phase-change heat storage and supply unit and production method thereof |
-
2016
- 2016-12-14 CN CN201611154080.1A patent/CN108219751A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100999657A (en) * | 2006-12-22 | 2007-07-18 | 华南理工大学 | Organism/expansion graphite composite phase transformation heat storaging material and preparation process and heat storing apparatus thereof |
| CN101239798A (en) * | 2008-01-04 | 2008-08-13 | 华南理工大学 | Organic matter/expandable graphite composite phase change heat-storing building material and preparation method thereof |
| CN105627804A (en) * | 2016-02-23 | 2016-06-01 | 上海交通大学 | Modular phase-change heat storage and supply unit and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 于海涛: "硬脂酸/膨胀石墨相变储热材料的制备与应用", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
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