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        1. Calculation of surface load density of silicon carbide rods:

        The surface load density of silicon carbide rod refers to the electric power that the heating part of the rod bears in use per unit surface area, namely: surface load

        Density= Under the same furnace temperature, if the unit surface load density of the rod is large, the service life of the rod will be short.
        Therefore, avoid overloading. The load density has the following relationship with furnace temperature and rod surface temperature:
        The correct selection of surface load density is an important way to rationally use silicon carbide rods and extend the life of the rods. The following shows the maximum allowable surface load density reference value of the silicon carbide rod under different furnace temperatures when the surface is at the rated use temperature.
        Rod surface temperature Furnace temperature ℃ Allowable maximum load W/Cm 2
        1450°C 1000 31
        1100 twenty four
        1200 twenty one
        1250 18
        1300 14
        1350 10
        1400 6

        2. Selection of silicon carbide rod specifications and calculation of required counts:

        The selection of silicon carbide rod specifications should mainly meet the requirements of electric furnace structure size, furnace power, furnace temperature and temperature field distribution, etc., and pay attention to the external wiring and power adjustment when using it. The number of silicon carbide rods required can be calculated by the following calculation: After the specification is determined, the load power number of each rod is:
        1 =F*W (watts)
        F-surface area of heating part of each rod (Cm 2 )
        W- in calculation The allowable load density (W/Cm 2 ) of the heating part at the furnace temperature
        needs count:

                 P --- Furnace power
           U --- Terminal voltage of series branch (V) u --- Voltage of each rod (V)
        Voltage of each rod:
           R- the nominal resistance value of a single rod.

        3. Selection of power supply equipment and connection method of silicon carbide rods:

        The power supply equipment is best to choose equipment with a large voltage regulation range and stable and continuous voltage regulation, such as magnetic voltage regulator, thyristor AC and DC voltage regulator, etc. If you choose a stepped regulating transformer, you should also choose a transformer with a small voltage difference and a large number of regulating gears. The connection mode of the silicon carbide rod elements can be connected in series or in parallel, preferably in parallel. When used in series, the number of branches in series should not be more than 3.

        4. Silicon carbide rod accessories

        Products can be provided according to the electrical parameters and specifications required by users

        5. Precautions for use and maintenance of silicon carbide rods

        1. Check the resistance (Ω) value marked on the cold end of the silicon carbide rod before installation and use. If the writing is unclear, it must be re-tested. The test method is the voltage measured when the silicon carbide rod is energized and heated to a high temperature of 1050°C , Current, resistance calculated by Ohm’s law, the test principle is shown in the figure below.

        2. When silicon carbide rods are used, each group of rods should be matched with high temperature resistance. The allowable difference in electrical resistance is: ≥φ12mm rod with resistance, tolerance of resistance value ≤0.2Ω, ≤φ8mm rod with resistance, resistance value The tolerance is ≤0.5Ω.

        3. After the rod passes through the rod holes on both sides (or up and down) of the furnace wall, it should be freely rotated 360 degrees to prevent forced installation and knocking. Before the rod is installed, it can be installed with an iron pipe of the rod diameter.

        4. The use of silicon carbide rods must be equipped with voltage regulator or thyristor voltage regulator and voltage, ammeter and temperature automatic control instruments. During use, the resistance of the rod will gradually increase due to oxidation of the rod. In order to keep the furnace temperature normal, the operating voltage should be increased. When the voltage is increased to the maximum limit of the voltage transformer used and still cannot meet the requirements, the furnace can be stopped to change the wiring method of the rod and continue to use .

        5. When the new furnace starts to transmit power, in order to prevent the rod from breaking, use 1/2 of the rated power of the electric furnace for a period of time, and then gradually increase the voltage after everything is normal. The temperature should be raised according to the temperature of the electric furnace to avoid excessive power. Broken silicon carbide rod.

        6. For new furnaces or electric furnaces (kilns) that have not been used for a long time, the furnaces (kilns) must be baked before use, and old rods or other heat sources should be used as much as possible when baking the furnaces (kilns).

        7. It is strictly forbidden to use the silicon carbide rod with overload. If the rod is broken for some reason or the rod is found to be unevenly heated, and the part is incandescent or dark red for a period of time, it means that the rod body is inconsistent in aging, and the resistance of the section is too different. It is best to replace all the new rods for maintenance and replacement. For example, when replacing some new rods or single rods, the resistance of the new rods and the used rods are not matched properly, resulting in unbalanced load and uneven furnace temperature. Due to the large resistance difference, the rod temperature is also correlated, which will seriously affect the service life.

        8. If moisture is discharged during the heating process when the device or material plant is fired, the resistance furnace (kiln) used should be provided with exhaust holes to remove the moisture or other exhaust gas in the furnace (kiln) so as not to affect the rod Service life.

        9. The storage process of the stick should be protected from moisture. If the aluminum sprayed on the rod end is found to be deliquescence, the aluminum can be sprayed again after surface treatment. If there is no aluminum spray condition, you can wrap several layers of aluminum foil on the rod spray aluminum section.

        10. The silicon carbide rod is hard and brittle, so be careful when transporting, unpacking, installing and replacing. Handle with care, handle with care, and prevent mechanical knocks to avoid breaking the rod.

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