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Low-cost calcium-based heat storage material and preparation method thereof

A heat storage material and thermal material technology, applied in the field of heat storage materials, can solve problems such as difficult to reach the decomposition temperature of calcium carbonate, weak optical absorption, weak solar energy collection ability, etc., and achieve simple and easy operation of acidification method, simple preparation method and low cost Reduced effect

Inactive Publication Date: 2021-11-05
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, few scholars have made research on the solar calcination process and the low solar radiation absorption rate of calcium-based materials.
Calcium carbonate has a weak optical absorption of solar radiation (less than 10%), and this very weak solar energy harvesting capability makes it difficult to reach the decomposition temperature of calcium carbonate required to drive the reverse endothermic reaction

Method used

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  • Low-cost calcium-based heat storage material and preparation method thereof
  • Low-cost calcium-based heat storage material and preparation method thereof
  • Low-cost calcium-based heat storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of Ca / Mg100 Calcium-Based Heat Storage Material

[0030] Preparation of dolomite-based calcium-based heat storage materials based on the sol-gel method, specifically:

[0031] Step 1, prepare 90 mL of propionic acid solution with a concentration of 50 Vol.%, and calcinate dolomite with a particle size of 75-150 μm for 1 hour at 900° C. in a muffle furnace.

[0032] Step 2: Weigh 6 g of the calcined dolomite sample, pour it into a 50 Vol.% propionic acid solution, and stir the mixed solution for 30 minutes at 50°C in a constant temperature heating stirrer until the dolomite is completely dissolved.

[0033] In step 3, the mixed solution is placed in an oven and dried at 110° C. for 24 hours.

[0034] Step 4: Put the dried sample into a muffle furnace at a heating rate of 5°C / min, raise the temperature to 800°C, and keep at a constant temperature for 120 minutes to obtain a Ca / Mg100 dolomite-based acid-modified calcium-based heat storage material.

Embodiment 2

[0036] Preparation of Ca / Mg100-Mn0.5-Fe1 Calcium-Based Heat Storage Material

[0037] Ca / Mg:Mn:Fe=100:0.5:1 calcium-based heat storage materials were prepared based on sol-gel method. Specifically:

[0038] Step 1, prepare 90 mL of propionic acid solution with a concentration of 50 Vol.%, and calcinate dolomite with a particle size of 75-150 μm at 900° C. for 1 hour in a muffle furnace.

[0039] Step 2: Weigh 6 g of the calcined dolomite sample, pour it into a 50 Vol.% propionic acid solution, and stir the mixed solution for 30 minutes at 50°C in a constant temperature heating stirrer until the dolomite is completely dissolved.

[0040] Step 3, heat the stirrer at a constant temperature to raise the temperature to 80°C, and add 25.88g of complexing agent citric acid C to the mixed solution in sequence 6 h 8 o 7 ·H 2 O, 141 μL light-absorbing component manganese nitrate Mn(NO 3 ) 2 and 0.49g iron nitrate Fe(NO 3 ) 3 9H 2 O.

[0041] Step 4, place the filtrate in an o...

Embodiment 3

[0044] Preparation of Ca / Mg100-Mn1-Fe2 Calcium-Based Heat Storage Material

[0045] Ca / Mg:Mn:Fe=100:1:2 calcium-based heat storage materials were prepared based on sol-gel method. Specifically:

[0046] Step 1, prepare 90 mL of propionic acid solution with a concentration of 50 Vol.%, and calcinate dolomite with a particle size of 75-150 μm at 900° C. in a muffle furnace for 1 hour.

[0047] Step 2: Weigh 6 g of the calcined dolomite sample, pour it into a 50 Vol.% propionic acid solution, and stir the mixed solution for 30 minutes at 50°C in a constant temperature heating stirrer until the dolomite is completely dissolved.

[0048] Step 3, heat the stirrer at a constant temperature to raise the temperature to 80°C, and add 26.27g of complexing agent citric acid C to the mixed solution in sequence 6 h 8 o 7 ·H 2 O, 282 μL light-absorbing component manganese nitrate Mn (NO 3 ) 2 and 0.98g iron nitrate Fe(NO 3 ) 3 9H 2 O.

[0049] Step 4, place the filtrate in an oven...

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Abstract

The invention discloses a low-cost calcium-based heat storage material and a preparation method thereof, and belongs to the technical field of heat storage materials. A calcium-based raw material of the calcium-based heat storage material is natural dolomite which is doped with light absorption components in different proportions, including manganese nitrate Mn (NO3)2 and ferric nitrate Fe (NO3)3.9H2O. Through acidification pretreatment of calcined dolomite, the heat storage / release performance of the dolomite material is enhanced. By doping light absorption components in different molar ratios (Ca / Mg: Mn: Fe = 100: 0.5: 1, 100: 1: 2, or 100: 2: 4), the defect of poor optical absorption performance of a traditional calcium-based material is overcome. The calcium-based material doped with the light absorption components can directly interact with solar radiation photons, so that more solar radiation can be absorbed. In the invention, the acidification method is simple, the cost of the calcium-based raw material is low, and the method is suitable for large-scale technical route, large-scale mass production and industrial application.

Description

technical field [0001] The invention belongs to the technical field of heat storage materials, and in particular relates to a calcium-based heat storage material based on acid modification of natural dolomite and doped with light-absorbing components Fe / Mn and a preparation method thereof. Background technique [0002] In order to alleviate the problems of energy shortage and environmental pollution, realize a smooth transition from fossil fuels to clean and renewable energy. Concentrated Solar Power (CSP), as one of the two main technologies for solar energy utilization, provides the possibility of large-scale power generation and commercial expansion. Efficient and cost-competitive thermal energy storage systems play a vital role in overcoming the limitations of solar energy utilization. Compared with the first-generation sensible heat storage and the second-generation latent heat storage, thermochemical energy storage has broad application prospects due to its high energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/03C04B35/622C04B35/624
CPCC04B35/03C04B35/622C04B35/624C04B2235/3272C04B2235/3262C04B2235/6562C04B2235/6567C04B2235/9607
Inventor 孙健柏生斌隆芸栗珂珂李和雯赵传文
Owner NANJING NORMAL UNIVERSITY