Working Principle
Fluid explosion-proof electric heater is a device that converts electrical energy into thermal energy to heat the material to be heated. During operation, the low-temperature fluid medium enters the input port under pressure through the pipeline, flows along the specific heat exchange channel inside the electric heating container, following the path designed based on fluid thermodynamics, and carries away the high-temperature thermal energy generated by the electric heating elements during operation, thereby raising the temperature of the heated medium. The outlet of the electric heater provides the high-temperature medium required by the process. The internal control system of the electric heater automatically adjusts the output power of the electric heater based on the temperature sensor signal at the outlet, ensuring uniform temperature of the medium at the outlet. When the heating element overheats, the independent overheat protection device of the heating element immediately cuts off the heating power supply, preventing the heated material from overheating, coking, deteriorating, or carbonizing, which could otherwise damage the heating element. This effectively extends the service life of the electric heater.
Application Scope
Typical applications of fluid explosion-proof electric heaters mainly include:
1. Heating of chemical materials in the chemical industry, drying of certain powders under pressure, chemical processes, and spray drying.
2. Heating of hydrocarbons, including crude oil, heavy oil, fuel oil, thermal oil, lubricating oil, paraffin, etc.
3. Heating of process water, superheated steam, molten salt, nitrogen (air) gas, water gas, and other fluids that need to be heated.
4. Due to the explosion-proof structure, the equipment can be widely used in chemical, military, petroleum, natural gas, offshore platforms, ships, mining areas, and other places requiring explosion-proof measures.
Functional Features
1. Small size, high power: The heater mainly uses bundled tubular electric heating elements.
2. Fast thermal response, high temperature control accuracy, and high overall thermal efficiency.
3. High heating temperature: The maximum working temperature of the heater can reach 850°C.
4. Uniform outlet temperature, high temperature control accuracy.
5. Wide application range, strong adaptability: The heater can be used in explosion-proof or ordinary environments, with explosion-proof rating up to dⅡB and C levels, and pressure resistance up to 20MPa.
6. Long life, high reliability: The heater is made of special electric heating materials, designed with low surface power load, and equipped with multiple protections, greatly enhancing the safety and service life of the electric heater.
7. Fully automatic control: According to requirements, through the heater circuit design, automatic control of parameters such as outlet temperature, flow rate, and pressure can be easily achieved, and it can be networked with computers.
8. Significant energy-saving effect: Almost 100% of the electrical energy is converted into heat and transferred to the heating medium.
Converting electrical energy into thermal energy to heat objects is a form of electrical energy utilization. Compared with conventional fuel heating, electric heating can achieve higher temperatures (e.g., arc heating can reach temperatures above 3000°C), and it is easy to achieve automatic temperature control and remote control (e.g., vehicle-mounted electric heating cup). It can maintain a certain temperature distribution of the heated object as needed. Electric heating can generate heat directly inside the heated object, resulting in high thermal efficiency, fast heating speed, and can achieve overall uniform heating or local heating (including surface heating) according to the heating process requirements. It is easy to achieve vacuum heating and controlled atmosphere heating. During the electric heating process, less waste gas, residue, and dust are produced, keeping the heated object clean and not polluting the environment. Therefore, electric heating is widely used in production, scientific research, and testing fields. Especially in the manufacturing of single crystals and transistors, mechanical parts and surface quenching, smelting of ferroalloys, and manufacturing of artificial graphite, electric heating methods are used.
According to the different methods of electrical energy conversion, electric heating is usually divided into resistance heating, induction heating, arc heating, electron beam heating, infrared heating, and dielectric heating.
1. This SRY6-3/380V/4KW sheath electric heater consists of a heating core and a sheath tube. The heating core uses tubular electric heating elements as the heat source, and the sheath tube is made of thin stainless steel, which has a large heat dissipation area and fast heat transfer. The terminal part is divided into ordinary type (using iron stretched cup-shaped shell) and special type (using bolted flameproof device seal). The special type meets the requirements of explosion-proof mark dIICT4 and protection level IP65 series standards.
2. The electric heater is connected to the oil tank container body by flange. The sheath isolates the heating core from the heated oil. When maintaining the electric heater, there is no need to drain the oil from the tank; only the heating core needs to be pulled out and replaced with a new one, making maintenance convenient.
3. During design, the contact area between the sheath and the heated oil should be considered to prevent local carbonization of the oil due to excessive heating temperature. This model of heater is only suitable for thermal oil or oil with good heat transfer effect, used for heating within the medium.
Technical Parameters of SRY6-3/380V/4KW Sheath Electric Heater:
Rated Voltage: Single-phase 220V, Three-phase 380V
Surface Heating Power: As far as possible ≤0.7W/cm² as design standard
Heat Transfer Temperature: ≤300°C
Working Medium: Mineral
Working Pressure: ≤0.8MPa
Heater Installation Size: Ø81mm
Application:
SRY6-3/380V/4KW sheath electric heater is used for heating hydraulic and lubricating oil in hydraulic and lubrication devices, and can also be used for heating non-corrosive gases or liquids. 
