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Chemical heat-storage material and method for manufacturing same, and chemical heat pump and method for operating same

A technology of chemical heat storage and manufacturing method, applied in chemical instruments and methods, materials for heat exchange, heat storage equipment, etc., to achieve the effect of high reaction rate

Active Publication Date: 2020-02-07
TATEHO CHEM IND CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since these calcium hydroxide and magnesium hydroxide do not undergo an effective dehydration reaction at a low temperature range of 100 to 400°C, there is a problem that they do not function as practical heat storage materials.

Method used

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  • Chemical heat-storage material and method for manufacturing same, and chemical heat pump and method for operating same
  • Chemical heat-storage material and method for manufacturing same, and chemical heat pump and method for operating same
  • Chemical heat-storage material and method for manufacturing same, and chemical heat pump and method for operating same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0082] Weigh 5g magnesium hydroxide (purity over 99%, BET specific surface area 8.4m 2 / g, the volume average particle diameter is 3.5 μm), and acetic acid (Kanto Chemical Reagent, special grade) was weighed in an amount of 2.4 mol % with respect to the magnesium hydroxide. Dissolve the weighed acetic acid in 50 mL of deionized water to obtain an aqueous solution of acetic acid. The above-mentioned weighed magnesium hydroxide was added to the aqueous acetic acid solution, and stirred with an electromagnetic stirrer at a rotation speed of 60 (rpm) for 300 seconds to prepare a slurry. The slurry was dried at 110° C. for 12 hours or more in a drier (DRA430DA manufactured by Advantec Co., Ltd.) to remove water, thereby producing a chemical heat storage material. The thermal behavior of the obtained chemical heat storage material was confirmed by the evaluation method described above, and the reaction rate was calculated.

Embodiment 2）

[0091] Weigh 5 g of magnesium hydroxide, weigh 2.4 mol% of nitric acid (Kanto Chemical Reagent, special grade) relative to the magnesium hydroxide, weigh 20 mol% of lithium hydroxide relative to the magnesium hydroxide Monohydrate (Kanto Chemical Reagent, special grade, purity 98.0%). The weighed nitric acid was completely dissolved in 50 mL of deionized water to obtain a nitric acid aqueous solution. The aforementioned weighed magnesium hydroxide and lithium hydroxide monohydrate were added to the nitric acid aqueous solution, and stirred with an electromagnetic stirrer at a rotation speed of 60 (rpm) for 300 seconds to prepare a slurry. The slurry was dried at 110° C. for 12 hours or more in a drier (DRA430DA manufactured by Advantec Co., Ltd.) to remove water, thereby producing a chemical heat storage material. The thermal behavior of the obtained chemical heat storage material was confirmed by the evaluation method described above, and the reaction rate was calculated.

Embodiment 3）

[0095] Except having changed the quantity of nitric acid into the quantity of 4.8 mol% with respect to magnesium hydroxide, the chemical heat storage material was manufactured by the method similar to Example 2, and the reaction rate was calculated similarly.

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Abstract

Provided is a chemical heat-storage material that stores heat using a dehydration reaction of a hydroxide of an alkaline earth metal, said chemical heat-storage material exhibiting a higher reaction rate and enabling heat storage at a lower temperature. Also provided is a chemical heat pump for using said chemical heat-storage material to store and emit heat. The chemical heat-storage material contains an oxide and / or a hydroxide of an alkaline earth metal, and an acid, the acid content being 0.05-30mol% with respect to the alkaline earth metal. The chemical heat pump (10) uses an endothermicdehydration reaction and an exothermic hydration reaction, and comprises: a reactor (11) that accommodates the chemical heat-storage material (21) containing an oxide and / or hydroxide of an alkaline earth metal; a heat-supply means (12) that is thermally connected to the reactor and supplies heat from outside to the chemical heat-storage material; a heat-recovery means (13) that is thermally connected to the reactor and extracts heat created from the chemical heat-storage material to the outside; a storage tank (14) that stores water (22); a connecting pipe (15) that connects the reactor and the storage tank, and through which water passes; and an acid-supply mechanism (17) that supplies acid into the chemical heat pump.

Description

technical field [0001] The present invention relates to a chemical heat storage material and its manufacturing method, as well as a chemical heat pump and its operating method. Background technique [0002] In recent years, the use of fossil fuels has been required to be reduced due to carbon dioxide emission restrictions, and it is necessary to promote the utilization of exhaust heat in addition to energy saving in each process. Warm water heat storage at 100° C. or lower that utilizes water is known as a means for utilizing exhaust heat. However, in warm water heat storage, there are: (1) it is impossible to store heat for a long time due to heat loss, (2) a large amount of water is required due to the small sensible heat, and it is difficult to compact the heat storage equipment, (3) the output temperature Based on utilization rather than constant, gradual decline, etc. issues. Therefore, in order to promote the livelihood utilization of such exhaust heat, it is necessa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D20/00C01F5/14C09K5/16F25B17/08
CPCC01F5/14C09K5/16F25B17/08F28D20/00Y02B30/62Y02P20/129Y02A30/27Y02E60/14Y02P20/10C01F5/02C02F5/14
Inventor 冈田翔太刘醇一
Owner TATEHO CHEM IND CO
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