Apparatus for incinerating rice husk and producing SiO2 rice husk ash with nano structure therefor

Abstract

The invention is a rice hull burning device and the nano structural SiO2 rice hull ashes produced by it, and the device includes a burning container, where the bottom board is distributed with many small hole, the inside of the container is distributed with heat exchange water pipes, it regulates the distribution density of these water pipes to control the burning temperature under 600 deg.C in the rice hulls, thus able to ensure the produced rice hull ashes are nano structural rice hull ashes, using the produced heat energy in burning course, and simultaneously solving the problem of limitation to the bulk of a rice hull pile; the produced nano structural SiO2 rice hull ashes contain many about 50 nm-sized SiO2 particles loosely bound together and many holes, where the content of SiO2 exceeds 90%, and has superhigh activity of volcanic ash and strong reinforcement action on ordinary concrete and high-strength concrete, and when the quantity of replacing the cement is 5-20%, can heighten the pressive strength of high-strength concrete by above 10MPa.

Description

technical field [0001] The invention is a rice husk incineration device and the nanostructured SiO produced therefrom 2 Rice husk ash. technical background [0002] The quantity of agricultural by-product rice husk is huge, and only my country just exceeds 4,000,000 tons every year. But so far, rice husks have not found a good way of development and utilization. Many places use rice husks as agricultural waste, which not only wastes resources, but also causes great pressure on the rural environment. In fact, rice husks contain about 20% amorphous SiO 2 , which is a valuable mineral resource and should be extracted and utilized. In some current rice husk utilization technologies, rice husk is mainly used as a heat source, and air is blown in when burning rice husk to increase the combustion temperature as much as possible. The rice husk ash obtained in this way, because the temperature during incineration is too high, its SiO 2 It is in a crystall...

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Problems solved by technology

However, this technical solution actually has three defects: first, when the rice husk is piled up carbonized and ashed, the heat in it is not effectively exported, and the heat accumulated inside causes the incineration temperature to still be too high, reaching 700-750°C; A large number of studies have shown that when the incineration temperature of rice husk exceeds 600 °C, its chemical activity is not high; second, in order to avoid a large amount of heat accumulation, the volume of the conical pile of rice husk accumulation should not be too large, and the amount of rice husk burned each time is only a few. 100 kilograms, the production scale is limited; the third is that when producing rice husk ash, the heat of rice husk is not utilized, resulting in a waste of energy

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