In addition, domestic preheaters for preheated air have been used in industrial furnaces since the 1950s. The main forms are heat exchangers in the form of tubular, cylindrical radiant and cast iron blocks, but the exchange efficiency is low. In the 1980s, domestically developed heat exchangers such as jet flow, jet radiation, and multiple benches were mainly used to solve the waste heat recovery of medium and low temperature. Significant effects have been achieved in the recovery of flue gas waste heat below 100 degrees, and the heat exchange efficiency is improved. However, at high temperatures, due to the material of the heat exchanger, the service life is low, the maintenance workload is large or the solid cost is expensive, which affects the promotion.
At the beginning of the 21st century, Gongyi City, Henan Province, China finally developed a silicon carbide ceramic heat exchanger. The production process is basically the same as that of the kiln furniture. The thermal conductivity and oxidation resistance are the main application properties of the material. Its principle is to place the ceramic heat exchanger in the place where the flue outlet is near and the temperature is high. It does not need to be mixed with cold air and high temperature protection. When the temperature of the furnace is 1250-1450 °C, the temperature of the flue outlet should be 1000- At 1300 °C, the recovered heat of the ceramic heat exchanger can reach 450-750 °C, and the recovered hot air is sent to the kiln to form a mixed gas with the gas for combustion, thereby directly reducing the production cost and increasing the economic benefit.
The ceramic heat exchanger has been well developed under the limitation of the use of the metal heat exchanger, because it solves the problems of corrosion resistance and high temperature resistance, and becomes the optimal heat exchanger for recovering high temperature waste heat. After years of production practice, it shows that the ceramic heat exchanger works well. Its main advantages are: good thermal conductivity, high temperature strength, good resistance to oxidation and thermal shock. Long life, small maintenance, reliable and stable performance, easy to operate. It is the best device for recovering the residual heat of high temperature flue gas.
CCTV reported that it was the first time in China to overcome the problem that traditional materials such as metals are easily damaged under high temperature or harsh environment. The new technology for heat exchangers that replace ceramics with ceramics, which was first developed and put into use, has been included in the National Torch Program. This new technology turns the cold air originally used in industrial kilns into hot air, which not only improves work efficiency but also saves a lot of energy. Since ceramic heat exchangers are one of the main equipments for improving energy efficiency and have a wide range of industrial applications, their application prospects are considerable.
At present, ceramic heat exchangers can be used in the main thermal kiln of metallurgy, non-ferrous, refractory, chemical, building materials and other industries, and are making great contributions to the world's energy-saving and emission reduction undertakings.
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