A double-shell phase change heat storage ball and its preparation method
A technology of phase-change heat storage balls and double shells, which is applied in heat storage equipment, lighting and heating equipment, chemical instruments and methods, etc., can solve the problems of poor thermal shock stability of alumina and high-temperature phase change storage of dense alumina shells. Hot microcapsule cycle life is short and other problems, to achieve the effect of strong stability, good sealing, simple process
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preparation example Construction
[0042] The preparation method of the alumina refractory slurry:
[0043] 80-90wt% corundum fine powder, 3-5wt% α-alumina powder, 4-8wt% Guangxi soil, 1-3wt% silica powder, 1-2wt% wood calcium and 1-2wt% The dextrin is premixed to obtain a premixed material; then 6-8wt% of aluminum dihydrogen phosphate solution and 8-10wt% of water are added to the premixed material, and the mixture is evenly stirred to prepare alumina refractory slurry.
[0044] Preparation method of mullite refractory slurry:
[0045] Mix 68-82wt% mullite fine powder, 6-10wt% α-alumina powder, 4-8wt% Guangxi soil, 5-9wt% silica powder, 1-2wt% wood calcium and 2-3wt% % dextrin is premixed to obtain a premix; then 6-8wt% of aluminum dihydrogen phosphate solution and 8-10wt% of water are added to the premix and stirred evenly to obtain mullite refractory slurry material.
[0046] The organic burn-off is one of starch, sawdust and rice chaff, and the particle size of the organic burn-off is ≤180 μm.
[0047] ...
Embodiment 1
[0064] A double-shell phase change thermal storage ball and a preparation method thereof. The steps of the preparation method described in this example are: Step 1. According to the batching of 50wt% paraffin and 50wt% organic burnt matter, at 80°C, first place the paraffin in an oven and keep it for 1h to obtain a paraffin melt Then add the organic lost matter to obtain a paraffin wax melt containing lost matter; then place the metal ball in the paraffin melt containing lost matter and impregnate it for 20s, cool naturally in a fume hood to obtain lost matter & paraffin wax coating metal ball.
[0065] Step 2, put 15wt% alumina refractory slurry in the disc granulator, then add 85wt% of the burnt matter & paraffin-coated metal balls into the disc granulator, / min rotation for 1 hour, take it out, place it in a fume hood for 4 hours, and keep it at 80°C for 24 hours to prepare an alumina composite phase change heat storage ball green body.
[0066] Step 3: Put 40wt% mullite ...
Embodiment 2
[0076] A double-shell phase change thermal storage ball and a preparation method thereof. This example is except that the Al content of described aluminum ball is different, all the other are the same as embodiment 1:
[0077] The Al content of the aluminum balls is 98wt%.
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