Research on the melting technology of the hottest

Research on glass melting technology II

2 vacuum clarification technology

Figure 2 shows the schematic diagram of vacuum clarification test. The chemical composition of glass and clarifier used in the test are shown in Table 2

the initial test furnaces are small kilns with the scale of 2 ~ 6t/D and 20t/d. The initial purpose of the test is to reduce the residual bubbles after glass clarification and obtain better fused glass. Figure 3 shows the structure of the vacuum clarification zone. The continuous test results show that the number of bubbles with a diameter of 0.05 ~ 0.5mm in the glass before decompression clarification is 500 ~ 5000/kg, while after passing through the decompression clarification zone, the number of bubbles is reduced to 0.2/kg, and the clarification temperature under decompression is 250 ~ 300 ℃ lower than that under normal pressure. The temperature and pressure of the decompression clarification zone of the above four glasses are shown in Table 3. The refractories in the decompression zone are not completely made of platinum, but are made of refractories with less bubbles and some platinum, thus avoiding the reduction of platinum mechanical strength under high temperature

due to the reduced pressure clarification, the clarification temperature is reduced, and the clarification quality is greatly improved, resulting in good energy-saving benefits. The test results of Asahi nitrate subsidiary in Japan confirm that the energy consumption can be reduced by 30%. In addition, the maximum temperature of the original melting pool is about 1600 ℃, and the temperature of the melting pool is reduced by 100 ℃ by reducing pressure clarification. In addition to saving a lot of energy, it also extends the service life of refractory materials and reduces the emissions of CO2 and NOx. The volume of the clarification area also becomes smaller, and its size is equivalent to one twentieth of the volume of the daily discharge. Figure the testing instruments purchased by our company Jinan new era Gold Testing Instrument Co., Ltd. in this month include: quantitative sampling knife, electronic balance, paper thickness gauge, ring pressure gauge (paperboard compression gauge), tension machine, moisture tester, bursting tester, folding tester, surface absorption weight tester, smoothness tester, whiteness tester, stiffness tester Customers of gloss tester and other inspection machines have preferential gifts. 4 is the schematic diagram of total oxygen combustion technology and decompression clarification technology applied to the furnace at the same time [6]

3 conclusion

total oxygen combustion technology has been gradually promoted and applied in bottle glass and flat glass furnaces. The flame brightness of full oxygen combustion is high, the concentration of CO2 and H2O in the flame is large, and it has strong heat absorption and heat radiation, which is higher than the thermal efficiency of air combustion, but it is difficult to get a long flame. When used in large furnaces, the temperature distribution in the kiln is problematic, and the concentration of volatile components in the flue gas is large. The erosion of refractory materials in the flame space above the melting pool will intensify, so it needs to be replaced with electrofusion cast refractories, Therefore, the adoption in large-scale furnaces is delayed. The combination of total oxygen combustion technology and decompression clarification technology can not only reduce the temperature of the melting pool, but also make use of the high brightness flame radiation generated by total oxygen combustion. Due to the low temperature and miniaturization of the kiln, it is beneficial to the heat consumption of the kiln and refractory materials

the vacuum clarification technology may also be used in combination with other melting technologies other than total oxygen combustion. The vacuum clarification technology has better solved the problem of "removing bubbles" in glass production. At the same time, it saves energy, improves glass quality, and is very suitable for the production of refractory glass

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