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What is the principle of using an atmospheric tube furnace?

What is the principle of using an atmospheric tube furnace?
The atmospheric tube furnace generally consists of three parts: the convection chamber, the radiation chamber and the chimney. A furnace tube is laid in the convection chamber and the radiation chamber, and a flue baffle is arranged in the chimney. A high temperature atmosphere furnace is installed at the bottom, side walls or upper portion of the radiation chamber, and a burner is installed. A more advanced furnace is also equipped with a heat recovery system for flue gas and an air/fuel ratio control system. Fuel oil or fuel gas is burned in a tube furnace, and oil or other medium flows at a very high speed in the furnace tube. The function of the heating furnace is to create conditions for the conversion energy. The heat released by the combustion of the fuel is first transmitted to the outer surface of the tubular tube and then transmitted to the soil or other medium through the metal tube wall of the furnace tube. In this way, the oil or other medium is heated to the temperature required by the process, with sufficient heat to enter the next process equipment, phase change, or cracking reaction process to produce petroleum and chemical products.
Principles of atmospheric tube furnace use:
(1) Before use, first connect the burner to the power conditioning equipment and indicator equipment according to the instructions.
(2) silicon carbon rods are hard and brittle, so be careful when installing them, otherwise they will be easily broken. Two silicon carbon rods installed each time should have the same or close resistance (as specified on the package). This principle should also be followed when replacing silicon carbide rods.
(3) Cl2 or hall gas can affect the heating part of silicon carbon rod when it is above 500 °C, but CO2, and N2 only affect the thick joint part, and hydrogen can loosen the structure of silicon carbon rod, thus affecting its life. . Various alkali silicate and borate should not be in direct contact with the heat generating portion. Corrosive gas can damage the silicon carbide rod metal joints at high temperatures, so the burners are generally installed in places where these gases are not affected.
(4) The upper end of the thermocouple should have an asbestos rope, and slowly insert it into the fire hole in the electric furnace. The depth of the insertion should be appropriate, so that the even end and the combustion tube happen to be in contact with each other, and no pressure should be applied, so that it is not difficult to be damaged. If the insertion is too deep or too shallow, the correct reading will not be obtained. If it is too deep, it will pass over the bottom of the combustion tube and contact the silicon carbon rod, both of which are easily damaged. Thermocouples should not be inserted or removed at high temperatures to avoid bursting.

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