Glass kiln regenerator structure and working principle
The regenerator is a waste heat recovery device that performs heat exchange through heat release and heat storage of gas. The temperature of the flue gas (exhaust gas) discharged from the glass kiln is very high, usually about 1400-1500°C. There is also a large amount of heat energy in the exhaust gas, and this heat energy must be utilized. The purpose of a glass kiln equipped with a heat storage rate is, on the one hand, to save energy, and on the other hand, to make the flame reach a higher temperature. In glass melting, the flame temperature needs to reach about 1700°C. In addition to the heat energy provided by fuel combustion, It is also necessary to use the high temperature of the exhaust gas to preheat the air and gas to ensure that the flame reaches a high temperature.
Glass kiln regenerators can be divided into vertical and horizontal types according to the direction of air flow, and connected and separated types according to their structures. Among them, the vertical regenerator has a regenerator grate on the top of the gas flue, and checkered bricks are built on top of the grate. The wind and fire partition wall is the partition wall between the gas and the air. Due to the high temperature in the upper part, flying materials corrode , it is easy for fire to occur after burning, so its thickness is relatively large, and it requires tight masonry construction. The exterior walls of the heat storage are lined with insulating bricks to reduce heat loss. The regenerator often needs to repair the checker bricks and clean the dust, so generally the exterior walls are equipped with hot repair doors and cleaning holes, and an ash pit is built in the flue.
When the high-temperature exhaust gas in the glass kiln passes through the regenerator from top to bottom, the lattice body in the regenerator is heated, the temperature of the lattice body slowly rises, and the volume of the lattice body absorbs a certain amount of heat; after changing the direction, when the combustion-supporting air and When the gas passes through the flue at the bottom of the regenerator and enters the regenerator from bottom to top, the grid body uses the accumulated heat to heat the air and gas, raising the gas temperature to achieve the purpose of preheating. The regenerator works cyclically. One cycle is the heating period and the other cycle is the cooling period. Therefore, its function is to use the checker bricks as the regenerator to accumulate the heat in the exhaust gas, and then use this heat to convert the air and gas. Warm up. Generally, air can be preheated to 1000~1200℃; coal gas can be preheated to 800~1000℃; the temperature of exhaust gas leaving the regenerator is about 600℃.
During the heat transfer process, the exhaust gas mainly transfers heat to the surface of the lattice body through radiation, and then transfers the heat to the interior through thermal conduction; when heating the air, the lattice body mainly transfers heat to the air through convection and radiation, because the heat in the air 02 and N2 are symmetrical diatomic atoms that neither radiate nor absorb, so the temperature is still dominated by convection heat transfer. When the gas is heated, the radiation effect is enhanced. The reversal time has a great influence on the heat exchange efficiency of the regenerator. In addition, the specific heat capacity, density, arrangement and gas flow in the channels also affect the heat exchange process. The air flow within the heat storage rate is mainly the uniform distribution of air flow on the cross section, which is of great significance for improving heat transfer and increasing thermal efficiency.
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