Introduction of arc voltage construction of electric heater in air duct
The arc voltage of the air duct electric heater is not high, but its current is very strong. Its powerful current is maintained by relying on the large amount of ions evaporated on the electrode, so the arc is easily affected by the surrounding magnetic field. When a gas such as an arc is formed between the electrodes, the temperature of the arc column can even reach 6000K. This method is suitable for the high-temperature melting of metals. General objects do not need such high temperatures to heat, and some objects will be This strong temperature heating method is destroyed. The construction of electric heat tracing can also be solved with a single heating belt, but there are many points that need to be paid attention to during the construction process.
First of all, when performing electric heat tracing construction, the glass fiber pressure-sensitive tape or aluminum tape should be fixed on the pipe every 50 centimeters. When laying flat, try to place it on the side under the pipe. The angle is controlled at about 45 degrees. In addition, the first heating point and the end of the line should be left with a heating belt of about one centimeter. The temperature of the electric heating cable is uniform, and it is neither too hot nor too cold, so it is very safe and reliable. The electric heating cable can save electricity to a large extent, and the energy saving is well done. Sometimes there will be intermittent during operation, you don't need to worry about the speed problem when restarting, because the electric heating cable can guarantee the speed of restarting, very fast. Arc heating has its unique characteristics. The temperature of the arc is very high and the energy is very concentrated. When the surface power of the steel-making electric arc furnace is the highest, it can reach 1,200 kilowatts per square meter. However, the noise of the arc is also very large, and its volt-ampere characteristic is also a characteristic of decline. In order to ensure the stability of the arc when the arc is heated, when the arc current instantaneously crosses zero, the instantaneous voltage value of the circuit is higher than the arc voltage value. It is larger to limit the short-circuit current. Therefore, in the power circuit, a resistor with a certain value must be connected in series to ensure its normal operation.
