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Application of nanocarbon/expanded graphite-chloride salt composite adsorption material

A composite adsorption material and expanded graphite technology, which is applied in the field of nano-carbon/expanded graphite-chloride salt composite adsorption material, can solve the problems such as the influence of ammonia adsorption rate and desorption rate not mentioned, and achieve the improvement of adsorption refrigeration efficiency, Significant application value, the effect of improving the desorption rate

Inactive Publication Date: 2017-07-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current research is generally to mix chloride salt with graphite, activated carbon, etc. to form a composite adsorbent. For example, patent 2004100667810 discloses a calcium chloride-expanded graphite mixed adsorbent, which mainly improves the refrigeration efficiency by increasing the thermal conductivity of the adsorbent. , but its effect on the adsorption rate and desorption rate of ammonia is not mentioned

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve 1.5 parts of carbon-coated nickel nanoparticles in ethanol, sonicate for 25 minutes, then add 33 parts of expanded graphite, continue to sonicate for 25 minutes, add 65.5 parts of strontium chloride, and sonicate for 20 minutes to obtain a mixed suspension. Put the mixed suspension into a 75°C water bath to heat and stir at the same time to make the ethanol volatilize quickly to obtain a viscous object and dry it to obtain carbon-coated nickel nanoparticles / expanded graphite-strontium chloride composite adsorption with a particle size of 50nm-200nm Material.

[0027] Dry the carbon-coated nickel nanoparticles / expanded graphite-chloride composite adsorption material and fill it into the adsorption bed after drying to remove water. The density of the carbon-coated nickel nanoparticle / expanded graphite-chloride composite adsorption material on the adsorption bed is 450Kg / m 3 , the adsorption bed is connected to the condensation / evaporation end storing liquid ammon...

Embodiment 2

[0031] When the temperature of the adsorption bed is adjusted to be 110°C, and the condensation / evaporation end temperature is -20°C, the ammonia is desorbed, and the desorption time is 80min. The desorption rate of ammonia by strontium chloride was increased by about 30% on average.

[0032] When the temperature of the adsorption bed is adjusted to be 170°C, and the condensation / evaporation end temperature is -20°C, the ammonia is desorbed, and the desorption time is 60min. The desorption rate of ammonia by strontium chloride increased by about 3% on average.

Embodiment 3

[0034] Dissolve 1.5 parts of carbon-coated aluminum nanoparticles in ethanol, sonicate for 25 minutes, then add 33 parts of expanded graphite, continue to sonicate for 25 minutes, add 65.5 parts of strontium chloride, and sonicate for 20 minutes to obtain a mixed suspension. The mixed suspension is heated in a 75°C water bath and stirred at the same time, so that the ethanol is quickly volatilized to obtain a viscous object, and dried to obtain carbon-coated aluminum nanoparticles / expanded graphite-strontium chloride composite adsorption with a particle size of 50nm-200nm Material.

[0035] Dry the carbon-coated aluminum nanoparticles / expanded graphite-chloride composite adsorption material and fill it into the adsorption bed after drying and removing water. The density of the carbon-coated aluminum nanoparticles / expanded graphite-chloride composite adsorption material on the adsorption bed is 500 Kg / m 3 , the adsorption bed is connected to the condensation / evaporation end s...

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Abstract

The invention discloses application of a composite adsorption material to an adsorption refrigeration system, a combined cold-electricity system or a combined cold-heat-electricity system. The composite adsorption material comprises 60 to 70 parts of a chloride salt, 30 to 40 parts of expanded graphite and 1 to 6 parts of nanocarbon particles. An application method comprises the following concrete steps: filling an adsorption bed with the composite adsorption material and allowing the density of the composite adsorption material on the adsorption bed to be 300 to 600 Kg / m<3>; and adjusting the temperature of the adsorption bed and the temperature of a condensation / evaporation terminal for adsorption and desorption of ammonia, wherein adsorption and desorption separately last for 1 to 2 h. Compared with conventional chloride salt-expanded graphite adsorbents, the nanocarbon / expanded graphite-chloride salt composite adsorption material provided by the invention is obviously improved in ammonia adsorption rate and ammonia desorption rate; and when the nanocarbon / expanded graphite-chloride salt composite adsorption material is applied to an adsorption refrigeration system employing a chloride salt-ammonia working substance pair and a combined cold-electricity system and a combined cold-heat-electricity system based on adsorption refrigeration, adsorption refrigeration efficiency of the systems is improved, and the composite adsorption material has substantial application value in the field of adsorption refrigeration.

Description

technical field [0001] The invention belongs to the field of adsorption refrigeration, in particular to a composite adsorption material of nano-carbon / expanded graphite-chloride salt [0002] Adsorption refrigeration systems and applications in adsorption refrigeration-based cogeneration systems or trigeneration systems. Background technique [0003] As a green refrigeration technology driven by low-grade heat energy, ammonia adsorption refrigeration technology has broad application space, such as solar air conditioners or heat pumps, industrial waste heat utilization, and ice making from fishing boats. Chloride salt-ammonia is a commonly used adsorption working medium pair, and refrigeration is performed through the transfer of heat during the adsorption and desorption of ammonia by chloride salt. At present, the improvement of adsorption refrigeration system and the development of new adsorbent materials are mainly used to promote the development of adsorption refrigerati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20F25B17/08
CPCY02P80/15B01J20/205F25B17/08
Inventor 吴起白张海燕余小芬王耀东钱艳楠
Owner GUANGDONG UNIV OF TECH
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