Inorganic salt/ceramic based composite heat-storing material produced with waste chromic hydroxide and producing method thereof

Abstract

The invention discloses an inorganic salt / ceramic based composite thermal storage material produced from waste chromium hydroxide and a method for producing the same. The products such as honeycomb ceramic thermal storage bodies, thermal storage balls, lattice bricks, vault furnace decks and slide blocks which are produced from the inorganic salt / ceramic based composite thermal storage material are advantageous to protect the environment and can reduce the production cost simultaneously; the thermal storage performance and the heat conductivity are improved to a large extent, and the use temperature is above 1,250 DEG C; the thermal storage density is 2 to 3 times of that of mullite and cordierite honeycomb ceramic thermal storage bodies; the corrosion resistance is strong, and the coefficient of thermal expansion is very low; and the defect is improved that the thermal transmission effect at the interface of a liquid phase and a solid phase is poor when the honeycomb ceramic thermal storage bodies generate (phase change) latent heat.

Description

technical field [0001] The invention relates to a ceramic heat storage material and a production method. Background technique [0002] In recent years, developed countries in the world have competed to develop high-temperature air oxygen-poor combustion technology (HTAC), honeycomb regenerative combustion system, in order to improve the thermal efficiency of industrial furnaces and reduce greenhouse gas CO 2 The emissions have produced a very significant effect. In this advanced environmental protection and energy-saving combustion system, the most critical component is the honeycomb ceramic regenerator. At present, the honeycomb ceramic regenerator mainly uses mullite and cordierite as raw materials, and mullite has a large density and specific heat capacity. , the price is relatively cheap, cordierite has the advantages of good anti-seismic performance and low price, but it has the following defects: one is the hazard of iron oxide, the furnace gas fume in the heating fur...

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Problems solved by technology

In this advanced environmental protection and energy-saving combustion system, the most critical component is the honeycomb ceramic regenerator. At present, the honeycomb ceramic regenerator mainly uses mullite and cordierite as raw materials, and mullite has a large density and specific heat capacity. , the price is relatively cheap, cordierite has the advantages of good anti-seismic performance and low price, but it has the following defects: one is the hazard of iron oxide, the furnace gas fume in the heating furnace contains a large amount of iron oxide and ferrous oxide , once in contact with the mullite honeycomb ceramic regenerator, under the temperature conditions of the heating furnace, it will react with the mullite honeycomb ceramic regenerator to form a eutectic, reducing the reflow temperature of the honeycomb ceramic regenerator, The reflow of the honeycomb ceramic regenerator or the continuous adhesion and thickening of iron oxide block the airflow channel, forcing the heating furnace to stop for maintenance due to the failure of normal operation; the second is acid and alkali corrosion. The high temperature flue gas of the heating furnace is generally above 1250°C. Contains alkali metal vapor and SO 2 Such acid gases are highly corrosive to mullite and cordierite honeycomb ceramic regenerators, causing the honeycomb ceramic regenerators to melt, bond and volatilize; third, the heat storage density is low, and mullite and cordierite honeycomb ceramic regenerators The body is mainly for sensible heat storage, and the sensible heat storage density is not high, especially the heat storage capacity of the cordierite honeycomb ceramic regenerator is small, and these two honeycomb ceramic regenerators are white and reflect heat. It is difficult to maintain a certain temperature for rapid heat absorption and heat release, resulting in low temperature of the preheated air, which is not conducive to high-temperature dilute oxygen combustion, and there will be insufficient oxygen in the furnace, which will cause the furnace head to suck air and the furnace tail The phenomenon of fire, due to insufficient combustion in the furnace, the temperature of the exhaust gas discharged is also high, it is difficult to achieve real environmental protection and energy saving, increase production and reduce consumption, so that the thermal efficiency of the kiln is far lower than 20% compared with developed countries The above; the fourth is the hazard of carbon deposition. In the furnace with high carbon content, it is easy to produce carbonized iron, and the carbonized iron is decomposed into iron and carbon. The fine carbon particles can easily penetrate into mullite and cordierite honeycomb ceramics for heat storage. In the loose pores or cracks of the body, under the action of thermal expansion and contraction of carbon, the honeycomb ceramic regenerator is cracked, broken and pulverized

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