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Thermochemical heat storage shaped granules with optimized permeability and preparation method thereof

A technology of thermochemistry and permeability, applied in the field of thermochemistry, can solve the problems of low mechanical strength and easy cracking of permeability, and achieve the effect of improving energy utilization rate, improving heat transfer performance, and simple and easy-to-operate preparation method

Active Publication Date: 2020-06-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of the existing heat storage particles that are easy to break after heat storage and release cycle, permeability and mechanical strength are not high, the present invention proposes a thermochemical heat storage molded particle with optimized permeability and a preparation method thereof. Good shape characteristics can be guaranteed after heat storage and discharge cycle, with high mechanical strength and high heat storage density, which can meet the needs of industrial application of thermochemical heat storage system

Method used

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  • Thermochemical heat storage shaped granules with optimized permeability and preparation method thereof
  • Thermochemical heat storage shaped granules with optimized permeability and preparation method thereof
  • Thermochemical heat storage shaped granules with optimized permeability and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] This example relates to the preparation process of thermochemical heat storage shaped particles with optimized permeability, specifically as follows:

[0026] Step 1, take by weighing 15g calcium hydroxide (analytically pure, produced by Sinopharm Group Chemical Reagent Co., Ltd.), 2.1255g carboxymethyl cellulose (analytical purely, McLean Biochemical Technology Co., Ltd.) and 0.7085g expanded vermiculite (Wancheng Mineral Products Co., Ltd.) into a beaker, using a glass rod to stir for 5 minutes; put the stirred mixture in a ball mill, put in an appropriate amount of agate balls, and ball mill and stir for 2 hours.

[0027] Step 2: Pour the uniformly dispersed mixture into a beaker, add deionized water at a ratio of 1.0 g / mL and stir well, so as to play the role of the carboxymethyl cellulose binder.

[0028] Step 3, using a tablet press to compress the mixture into cylindrical granules with a size of 8mm in diameter and 6mm in thickness.

[0029] Step 4, place the co...

Embodiment 2

[0035] This example relates to the preparation process of thermochemical heat storage shaped particles with optimized permeability, specifically as follows:

[0036] Step 1, take by weighing 10g calcium hydroxide (analytically pure, produced by Sinopharm Chemical Reagent Co., Ltd.), 1.0g carboxymethyl cellulose (analytical purely, McLean Biochemical Technology Co., Ltd.) and 1.0g expanded vermiculite (Wancheng ore Products Co., Ltd.) into a beaker and stirred for 15 minutes with a glass rod; put the stirred mixture in a mortar and grind for 1 hour.

[0037] Step 2: Pour the uniformly dispersed mixture into a beaker, add deionized water at a ratio of 0.9 g / mL and stir well, so as to play the role of carboxymethyl cellulose binder.

[0038] Step 3, using a tablet press to compress the mixture into cylindrical granules with a size of 8mm in diameter and 6mm in thickness.

[0039] Step 4, place the compressed columnar particles in a vacuum drying oven, set the temperature at 75 d...

Embodiment 3

[0045] This example relates to the preparation process of thermochemical heat storage shaped particles with optimized permeability, specifically as follows:

[0046] Step 1, take by weighing 20g calcium hydroxide (analytically pure, produced by Sinopharm Group Chemical Reagent Co., Ltd.), 2.834g carboxymethyl cellulose (analytical purely, McLean Biochemical Technology Co., Ltd.) and 0.945g expanded vermiculite (Wancheng Mineral Products Co., Ltd.) into a beaker and stirred with a glass rod for 20 minutes; put the stirred mixture in a mortar and grind for 1 hour.

[0047] Step 2: Pour the uniformly dispersed mixture into a beaker, add deionized water at a ratio of 1.0 g / mL and stir well, so as to play the role of the carboxymethyl cellulose binder.

[0048] Step 3, using a tablet press to compress the mixture into cylindrical granules with a size of 8mm in diameter and 6mm in thickness.

[0049]Step 4, place the compressed columnar particles in a vacuum drying oven, set the te...

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Abstract

The invention discloses thermochemical heat storage forming granules with optimized permeability and a preparation method thereof. The thermochemical heat storage forming granules comprise the following components by mass percentage: 80-85% of calcium hydroxide taken as a heat storage material, 10-15% of carboxymethyl cellulose taken as an adhesive and 5-10% of expanded vermiculite taken as a skeleton material; the thermochemical heat storage forming granules are obtained by fully mixing calcium hydroxide, carboxymethyl cellulose and expanded vermiculite, pressing into granules, curing and molding, and sintering the cured and molded granules so that carboxymethyl cellulose is decomposed into activated carbon and forms a porous skeleton together with expanded vermiculite. The thermochemicalheat storage forming granules have the advantages that the shape feature can be ensured to be good after heat storage and exothermic cycle, and the granules have relatively good mechanical strength;at the same time, the temperature required for heat storage is reduced, thereby facilitating heat storage reaction to be in progress; and internal pores of the granules are plentiful and the pore sizedistribution range is relatively wide, so that the gas permeation for an exothermic reaction is facilitated, and the demands of industrial application of thermochemical heat storage systems can be met.

Description

technical field [0001] The present invention relates to a technology in the field of thermochemistry, in particular to a thermochemical heat storage molding particle with optimized permeability and a preparation method thereof for industrial waste heat, waste heat recovery systems and concentrated solar thermal power plants, etc. . Background technique [0002] Thermochemical heat storage fluidized bed devices have high requirements on the size of heat storage material particles, and smaller particles cannot achieve a fluidized state. In order to make heat storage materials form larger particles, the existing technology wraps ceramic materials Shell-core semi-permeable spherical particles are formed outside the calcium hydroxide heat storage material. However, due to the barrier effect of ceramics, water vapor is not easy to react internally through the ceramic shell, so the heat release efficiency and conversion rate of the heat storage material are greatly reduced. The in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14
CPCC09K5/14Y02P20/10
Inventor 赵长颖夏伯谦闫君
Owner SHANGHAI JIAO TONG UNIV
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