Although the energy consumption of flat glass in my country only accounts for 2~3% of the total consumption of building materials, it is about 1 times higher than the advanced level abroad. The reasons for the high energy consumption are, first, backward technology. Advanced energy-saving float glass only accounts for 6% of the total output, while vertical drawing and small flat drawing glass, which belong to the level of the 1930s, account for about 80%; second, the output proportion of small kilns (referring to three-machine kilns or less) is as high as 36%, and small kilns are not only of poor quality and high cost, but also 1~2 times higher in energy consumption than large and medium-sized kilns; third, sintered zirconium corundum bricks were originally used, which have poor quality, short kiln life and poor insulation, low thermal efficiency (about 40% abroad, about 20% in my country), and high fuel consumption.
In view of the above situation, corresponding technical transformation methods and new energy-saving technologies can be adopted.
(1) Strive to increase the proportion of float glass. Float glass adopts the advanced process of using tin bath as floating liquid. It not only has good glass quality (equivalent to mechanically polished glass), but also has large output (Japan's daily output can reach 700~900t, more than 3 times that of Jiuji Kiln). Fuel consumption can also be reduced to about 16~18kg/weight box, which is the future development direction. my country has built three production lines with a daily output of 250t and one production line with a daily output of 400-500t, with good economic benefits. In the future, in addition to adopting the above method and expanding the scale of new factories, it can also be adopted when renovating old factories if conditions permit.
(2) Actively develop large and medium-sized kilns. Except for remote areas, stop building small kilns with high energy consumption. Existing small factories should be jointly upgraded and transformed into medium-sized kilns. The recently appeared float kilns with a daily output of about 100t have good energy saving and economic benefits and can be adopted first.
(3) Improve the life of the kiln and improve the quality of refractory materials, such as using high-grade fused zirconium corundum bricks, zirconium ramming materials, high-density silica bricks and magnesia bricks, etc., and improve the kiln structure and masonry quality, while striving to double the life of the kiln, to achieve insulation of most of the furnace body and increase the thermal efficiency of the kiln to about 40%.
(4) Strengthen raw material preparation. For example, reasonable use of materials can reduce alkali consumption. Reasonable ingredients and preheating measures can also improve production, quality and reduce energy consumption.
In short, improving production technology and selecting high-quality fused zirconium corundum bricks and raw materials are effective ways to reduce energy consumption.
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