The electric heater is often used to raise, keep warm and heat the flowing liquid and gaseous media. For example: water, superheated steam, gas heating; and heating of heat transfer oil, fuel oil, asphalt, paraffin, powder, etc. When the heating medium passes through the heating chamber of the electric heater under pressure, the principle of fluid thermodynamics is used to uniformly remove the huge heat generated by the electric heating element, so that the temperature of the heated medium meets the user's process requirements.

Working principle: Circulating electric heater is a kind of consuming electric energy converted into heat energy to heat the materials to be heated. During work, the low-temperature fluid medium enters its input port under pressure through the pipeline, and takes away the high-temperature heat energy generated by the electric heating element along the specific heat exchange channel inside the electric heating vessel, using the path designed by the principle of fluid thermodynamics, The temperature of the heated medium is increased, and the high temperature medium required by the process is obtained at the outlet of the electric heater. The internal control system of the electric heater automatically adjusts the output power of the electric heater according to the temperature sensor signal of the output port, so that the medium temperature of the output port is uniform; when the heating element is overheated, the independent overheat protection device of the heating element immediately cuts off the heating power to avoid The over-temperature of the heating material can cause coking, deterioration, and carbonization, and in severe cases, the heating element will burn out, effectively extending the service life of the electric heater.

The circulating heater mainly adopts clustered tubular heating elements, which can be used in explosion-proof or ordinary occasions. Its explosion-proof grade can reach B and C grades, and its pressure resistance can reach 20Mpa. And the cylinder can be installed vertically or horizontally according to user needs.

 

Advantages and disadvantages of cluster electric heaters

 

1. Advantages of cluster electric heater:

1. Occupies a small space.

 

2. Compared with separate elements, more electric heating elements can be placed in the same space, so that the power density (power per unit heating area) of the electric heating elements is lower and the service life is longer.

 

3. High thermal efficiency, because the electric heating elements are relatively concentrated, the contact surface with the environment is small, and the heat loss is low.

 

4. The wiring is convenient. Since the internal wiring of the heater of the cluster element has been completed, the user only needs to pass in the power cable; and the separate element, the wiring is complicated, and each small heater needs the power cable access, which also increases the fault Probability.

 

5. For pressure vessels, the number of openings required for the installation of separate components will naturally increase. The pressure vessel needs to be reinforced, which increases the design difficulty and cost of the pressure vessel. The clustering component only needs to open one hole.

 

6. Fast hot start.

 

7. There are spare components inside the cluster components. In case the heating components are damaged, they can be replaced and the materials do not need to be unloaded. In case of damage to the sorted components, the materials must be removed before replacement.

 

 

2. Disadvantages of cluster electric heater:

 

 

The thermal uniformity of the heating medium of the separate element is relatively good.