Mineral Insulated Electric Circulation Heater for Circulating Pipeline is generally used for the industries where the pipeline circulation requires the media viscocity decreasing. Circulation Heaters, also known as in line heaters, are widely used in many applications. The heater shell can be in use steel, stainless steel, or titanium depending on the application conditions. For example, lube oil and waste oil applications often use steel as its better cost efficiency compared to stainless steel counterpart. For water media stainless steel should be used because of its anti-corrosive qualities on the ingredient in the water.

In both applications, a pump flows the liquid, such as water or glycerol, through a closed pipe circuit. The liquid is reheated as it flows through the circulation heater. A major consideration for this application is viscosity. Electric circulation heaters generate heat, making the medium less viscous. The less viscous the fluid, the easier it is to pump through a circuit of pipes.Explosion-proof Mineral Insulated Electric Heater for Flowing Liquid in Pipeline (hereinafter referred to as electric heaters) are heating devices designed to raise the temperature of the flowing medium in pipeline.

The mineral insulated (MI) heating cable is used as the heating element. The structure is firm and durable, reliable in operation and long service life to ensure that the heated medium does not coke. It is suitable for the temperature rise of various flowable media, especially suitable for heating mediums with heavy, high viscosity or high temperature or quality requirements (such as crude oil, asphalt, residual oil, heavy diesel oil, animal fat and vegetable oils, etc.). It is widely used in various industrial sectors such as petroleum, chemical, pharmaceutical, metallurgy, glass, power generation, etc. Typical applications include offshore oil platforms, wellhead heating in oil fields, high-temperature atomization before combustion in oil-fired kiln, and centralized air-conditioning hot water boilers.

Second, technical properties

1. The heat transfer performance of the heating element of this product is good, and the temperature difference between the heating core and the metal sheath is small. At the same time, according to the process requirements, the surface heat load density of the heating element of the MI heating cable can be accurately designed. Under the premise of ensuring the total heating power, the heated medium will not coke. It solves the shortcomings of the traditional tubular electric heaters for long-term carbon deposition, blasting, core breaking and short life. The heating element can with a copper or a stainless steel sheath according to the application temperature and location.

2. The outer shell of the electric heater is welded by seamless steel pipe and flange. The overall structure is tight and firm and the pressure sealing performance is good for safe use. The normal working pressure is 0.6MPa~6.4MPa.

3. The device connection and electrical connection meet the explosion-proof requirements with an explosion-proof grade d IIBT1—T6.

4. Two sets of temperature sensors are installed in electric heater to detect the temperature of the oil and the surface temperature of the heating element. At the same time, the flow locking device can be optionally selected according to the user's needs. When the medium does not flow, the electric heater automatically stops heating.

5. No daily maintenance is required and it is easy to be installed and convenient to be maintained.

6. The product is practical and adaptable. Various non-standard types of electric heaters can be designed according to the different uses and special requirements put forward by users.

Note: When designing an electric heater for using outdoors, the explosion-proof junction box should have a rainproof shed to prevent rainwater from impregnating the gap of the explosion-proof surface through the wet insulation material.

Third, structure and working principle

1. Structure

The electric heater structure consists of nine parts. (See Figure 1)

1 Inlet pipe 2 Diversion Chamber 3 Heating Chamber 4 Temperature Measuring Resistor 5 Over Temperature Protector 6 Junction Box 7 Oil Outlet Pipe 8 Mixed Flow Chamber 9 Sewage Outlet

Figure 1: Schematic diagram of liquid electric mineral insulated heater

2. Working Principle

The cold medium enters the diversion chamber through the oil inlet, so that the medium flows into the mixing chamber along the periphery of the heating element, and the mixed medium flows out from the oil outlet at a uniform temperature. The mixing chamber is equipped with a temperature measuring sensor, and the temperature signal is collected and transmitted to the electronic control system. The temperature control instrument controls the primary circuit to realize automatic control of the oil temperature. When the oil products or electric heating element of the heater is overheated, the protection device automatically cuts off the power supply and the control cabinet emits an audible and visual alarm signal.

Fourth, technical specification

1. Model meaning

2. Technical data

The main technical data are shown in Table 1.

Table 1 Technical Data and Outer Dimension Sheet for Vertical Electric Heater

Table 2 Technical Data and Outer Dimension Sheet for Horizontal Electric Heater