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Advantages of SiC heat exchanger

Publish time:2020-01-18 15:26:00
Silicon carbide heat exchanger is a new type of heat exchanger which uses silicon carbide ceramic material as heat transfer medium. Due to the excellent properties of SiC ceramic, such as corrosion resistance, high temperature resistance, high thermal conductivity, high hardness, wear resistance, etc., SiC ceramic heat exchanger is suitable for high temperature and corrosion-resistant environment.

Features of SiC heat exchanger:
The tubular silicon carbide insert high temperature heat exchanger is a new type of heat exchanger developed to replace the metal heat exchanger, solve its unreasonable operation in the high temperature flue gas for a long time and need to mix cold air to reduce the use effect. The heat exchanger made of this material is a new generation product of high temperature flue gas waste heat recovery in the world. The tubular silicon carbide insert high temperature heat exchanger has compact structure and large heat exchange area per unit volume. It adopts internal spring to compress and absorb heat expansion. When the flue gas temperature is 1300 ℃, the air preheating temperature can reach above 600 ℃. The interface part of the heat exchanger adopts corresponding technology to reduce vibration and strengthen sealing to reduce air leakage. The air leakage rate is less than 5% of the professional requirements.

The silicon carbide heat exchanger consists of a number of square air channel sections and rectangular silicon carbide pipes with cross-section of flue gas channel. The air channel and flue gas channel partition are double-layer, with firm structure and high mechanical strength. It solves the problem that the corrugated ceramic heat exchanger partition is easy to crack and leak air. Four L-shaped seals are pasted at the junction of air and flue gas channels, the shell is made of steel plate, and the middle is filled with aluminum silicate refractory fiber, which plays the role of sealing, heat insulation and mechanical vibration resistance. The air inlet and outlet disc is of internal connection type. The cold and hot air will generate stable flow in the connecting pipe, and the flow rate is stable. The heat exchanger can be widely used in the flue gas recovery of various industrial furnaces and is an ideal energy-saving device.

The high temperature ceramic heat exchanger of silicon carbide tube is characterized by a fire-resistant ceramic heat exchanger tube made of a tube disc with a length of 380-1600mln. The joint disc of the tube is square, octagonal or polygonal, the joint seam is stepped or flat joint, the middle part of the tube is provided with a fire-resistant hoop, and the tube is coated with glaze. The top and bottom layers of the heat exchanger are sealed by pouring. The ceramic heat exchanger constructed by this method has high air tightness, high heat exchange efficiency, and the air leakage rate is at least 50% lower than the original one, which can prolong the service life of the heat exchanger and the service life of the furnace.

The utility model is characterized in that the joint of the ceramic heat exchange pipe and the pipe body are integrated as a whole, and the joint adopts a U-shaped groove plug-in sealing structure, which can effectively prevent the preheating medium with higher pressure from leaking into the preheating medium with lower pressure, and can be used in the soaking pit of the iron and steel enterprise, the large continuous heating furnace, the vertical retort zinc smelting distillation furnace of the non-ferrous metallurgy system, the tower zinc distillation furnace and other high-temperature industrial furnaces, The temperature of air preheating can reach 800 ℃, and the fuel saving rate is 40%.
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