What are the common types of tubular electric heating elements?

Single-ended heating element

Single-ended heating element, also known as single-ended heating element or cartridge heaters, is a type of heating element (tubular heating element). In the Chinese heating industry, there's a long-standing designation for this element: M3. Since the late 1990s, heating element applications in China have expanded, and a variety of shapes have emerged. In southern China, these mold-use heating elements with a single-ended outlet have been referred to as single-ended or single-ended heating elements.

Overseas, they're called cartridge heaters, a descriptive term because the cartridge case is cylindrical and sealed at one end. This is similar to the term "single-ended heating element" in China. They feature a simple structure, high mechanical strength, high thermal efficiency, safety and reliability, easy installation, long service life, zero pollution, and a low price. They also save energy, are safe to use, can be bent into various shapes, are lightweight, and are easy to assemble and disassemble.

Finned electric heating tubes

Finned electric heating tubes convert electrical energy into heat energy to heat the material being heated. During operation, a low-temperature fluid enters the heating element under pressure through a pipe. It flows along a specific heat exchange path within the heating vessel, using a path designed using fluid thermodynamics principles. This path removes the high-temperature heat energy generated by the heating element, raising the temperature of the heated medium. The outlet of the finned electric heating tube receives the high-temperature medium required by the process.

Finned tubular electric heating elements are constructed by wrapping metal fins around the surface of conventional elements. This increases the heat dissipation area by 2-3 times compared to conventional elements, meaning the permissible surface power load of finned elements is 3-4 times that of conventional elements. The shortened element length reduces heat loss. Under the same power conditions, they offer advantages such as rapid heating, high thermal efficiency, long service life, compact size, and low cost. It can be installed in air ducts or other applications where static or flowing air is heated.

Flange Heating Tubes

Flange heating tubes (also known as plug-in electric heaters) utilize U-shaped tubular electric heating elements. These elements are assembled on flange covers according to the power configuration requirements and designed for different heating media. Inserted into the material to be heated, the substantial heat generated by the heating element is transferred to the heated medium, raising its temperature to meet the desired process requirements. When the medium temperature reaches the setpoint, the control system, based on the temperature sensor signal and performing PID calculations, adjusts the heater output power to achieve temperature control for the resistive load of the heating element, ensuring a uniform medium temperature and meeting the desired requirements. If the heating element overheats or the liquid level is low, an interlocking protection device immediately shuts off the heating power to prevent burnout and extend its service life.

Flange heating tubes are primarily used for heat preservation and heating of materials in various storage tanks, containers, and fuel tanks in the petroleum, chemical, food, and machinery industries. Connections can be flanged or threaded.

Titanium Heating Tubes

Titanium heating tubes feature a titanium tube as the outer shell, with heating alloy wires uniformly distributed along the central axis of the tube. The interstices are filled with compacted magnesia sand, which has excellent insulating and thermal conductivity properties. The tube ends are sealed with silicone or ceramic. These metal heating elements are designed for use in highly corrosive liquids. They feature a simple structure, high mechanical strength, high thermal efficiency, safety and reliability, easy installation, and a long service life. They are widely used in a variety of highly corrosive liquids. Titanium's low specific gravity makes it widely used for heating water, nitrate solutions, acid solutions, and alkaline solutions. Practice has proven that titanium, when used in anti-corrosion equipment, does not affect the plating solution, significantly improving the efficiency of the electroplating industry. The effective length of the heating element must be fully immersed in the liquid.

Teflon

Teflon heating tubes are a new type of highly corrosion-resistant heating tube designed for heating various corrosive liquids. They offer excellent aging resistance, good flexural properties, and a low surface load design. The joints are fully enclosed, acid- and alkali-resistant, and the non-heating section and overheating safety system are customizable to your needs. The heater is guaranteed to be durable, durable, and fully enclosed, corrosion-resistant, and leak-proof, with grounding protection for safety and reliability.

Our corrosion-resistant Teflon electric heating tubes offer high thermal efficiency, energy-saving features, and a cost-effective price-performance ratio. They can be designed in a variety of shapes, including spiral, L-shaped, U-shaped, W-shaped, mosquito coil-shaped, and combination-shaped. We have been recognized by numerous listed companies as their long-term supplier of mosquito coil-shaped Teflon heaters. We can also handle non-standard products, allowing our engineers to design voltage, power, size, shape, and wiring configurations to meet customer requirements. Custom production is welcome upon request.

Quartz Heating Tubes

The most commonly used quartz heating tube is a carbon fiber quartz heating tube. Carbon fiber heating tubes, also known as carbon fiber electric heating tubes, infrared heating tubes, infrared electric heating tubes, and carbon fiber infrared heating tubes, generate heat by placing a carbon fiber filament in a sealed, vacuum-evacuated quartz tube. Voltage is applied to the carbon fiber filament, causing it to heat up and generate heat. They offer advantages such as high power margin, high-temperature resistance, strong heat capacity, long service life, and adjustable power.

Radiant Heating Tubes

Radiant heating tubes are electric heating elements enclosed in a protective sheath. The heating element is then energized and heated, with the sheath indirectly radiating heat to the furnace lining and workpiece. They are widely used in various heating furnaces in the heat treatment industry. The electric heating alloy material used in radiant heating tubes has high resistivity and a high heat conversion rate. Because the radiant tube is placed within the sheath, the heat transfer process differs from that of conventional exposed heating elements. The heat shield is greater, and the element temperature must be controlled during the heating process to prevent overheating. When radiant tubes are enclosed for heating, the surface temperature of the heating element is approximately 100°C to 150°C higher than the furnace temperature. Therefore, when selecting the appropriate heating material, it is important to analyze the furnace temperature and the ambient air temperature inside the furnace.