Sheathed tubular electric heater precautions

Precautions:

1. The component is allowed to work under the following conditions:

A. The relative humidity of air is not more than 95%, and there is no blasting and corrosive gas. (explosion-proof heater outside)

B. The operating voltage should not be greater than 1.1 times the additional value and the enclosure should be usefully grounded.

C. Insulation resistance ≥ 1MΩ Dielectric strength: 2KV/1min.

2. The electric heating pipe should be well positioned and fixed. It is necessary that all the heating areas are completely immersed in liquid or metal solids and no air burning is allowed. When it is found that there is scale or carbon on the surface of the pipe, it should be eradicated and reused in a timely manner so as to avoid heat radiation and shorten the service life.

3. When heating fusible metal or solid nitrates, alkalis, bitumen, paraffin, etc., the voltage should be lowered first. After the medium is melted, it can rise to extra voltage.

4. When the air is heated, the components should be placed evenly across each other, so that the components have excellent heat dissipation conditions so that the flowing air can be heated.

5, safety measures should be considered when heating nitrate salt to avoid blasting events.

6, the wiring part should be placed outside the insulation layer, to avoid contact with corrosive, explosive media, moisture; lead wire should be able to accept the temperature and heating load of the wiring part for a long time, the fastening screw should be avoided when the fastening screw too fast.

7. The components should be stored in a dry place. If the insulation resistance is less than 1MΩ for a long time, it can be boring in an oven at about 200°C or it can be heated by a voltage drop until the insulation resistance is recovered.

8. The magnesium oxide powder at the outlet end of the electric heating pipe should be protected from the infiltration of pollutants and moisture in the place where it is used to avoid the onset of leakage.

Heat

You can use a regulator to change the input voltage and current to change the heat.

The amount of heat is proportional to the square of the voltage and is proportional to the square of the current.

When the voltage becomes 1/2 of the original, the calorific value becomes 1/4

When the current becomes 1/2 of the original, the calorific value also becomes 1/4

C (specific heat capacity of the substance to be heated) * M (total mass of substance to be heated) * T (temperature difference) = P (power) * T (time)

Power accounting

1. Calculate the required power heated from the initial temperature to the set temperature within the regular time [1]

2. Calculate the power required to maintain the temperature under the premise of maintaining the temperature of the medium.

3. Based on the above two kinds of accounting results, select the type and quantity of heaters. The total power takes the maximum of the above two powers and considers the 1.2 factor.

formula:

1, the initial heating required power KW = (C1M1T + C2M2T) ÷ 864/P + P/2

Where: C1C2 is the specific heat of the container and the medium (Kcal/Kg°C)

M1M2 is the mass of container and media (Kg)

T is the difference between the desired temperature and the initial temperature (°C)

H is the time required for the initial temperature to reach the set temperature (h)

P Heat capacity (Kw) of the container at final temperature

2, to maintain the temperature of the medium to extract the required power KW=C2M3T/864+P

Where: M3 added per hour kg/h

Short circuit problems

Fusing resistance wire [1]

Reasons: A. Short circuit caused by incineration of electric heating pipes;

B. The drop of the lead or lead of the heating tube causes a short circuit;

C, resistance wire diameter is too small, lack of capacity;

D. Electric hot plugs accumulate dust or carbonization to cause short circuits

E, the power cord plug and electric socket short circuit;

Treatment: A, replace the heating pipe;

B. From scratch welding;

C, replace the appropriate resistance wire heating tube, under normal circumstances, iron chromium aluminum resistance wire can be used.

D, shovel dirt, repair or replace parts

E, repair or replace the power plug or electric outlet;

Not hot

Reasons: A, for the adjustable temperature control heating tube, the temperature controller contacts bad touch or burn off.

B. The power supply is abnormal or blackout;

C, resistance wire has been broken;

D. The power cord plug and the electric socket have poor touch, or the power cord wire is broken;

E. Heater has been burned;

F, drop of heater tube lead or lead;

Treatment: A, heating tube is not good repair, advocate replacement;

B. Apply after normal power supply;

C. The heating pipe is abolished, and the same type of resistance wire is used to produce the device from scratch;

D, view the line to repair or replace;

E, replace the equipment with the standard heating pipe;

F, welding the lead or lead from scratch;

Leakage

Reasons: A. The drop of the circuit wire collided with the cup body;

B. Burnout of electric heating tube and short circuit of cup body;

C, not connected to the ground;

D. Too much dust on electric sockets or power plugs;

E, insulation damage to the heating pipe;

F, improper cleaning, moisture exposure into the cup;

Treatment: A, check the drop wire, welding from scratch;

B. The electric heating pipe has been damaged and replaced with the standard electric heating pipe;

C. Connect the ground wire as required and check if it is correct;

D, correct cleaning and boring treatment;

E, View repair if it also presents such things advocate replacement;

F, correct cleaning and boring treatment;

feature of product:

1. The electric heater is composed of a heating core and a jacket tube. The heating core uses a tubular heating element as a heat source, and the jacket tube is made of a thin stainless steel. It has a large heat dissipation area, fast heat transfer, and a part of the terminal equipment. It is an ordinary type (selecting an iron stretching cup type cover) and a special type (selecting a bolt type flameproof type device cover for sealing), and the special type has the requirements of the explosion-proof mark dIICT4. Protection degree IP65 series specification.

2. The electric heater and the tank body are connected by flanges. The jacket blocks the heating core and the heated fluid. When the electric heater is repaired, there is no need to release the oil in the tank. Only the heating core needs to be extracted. Replacement of a new heating core can be easily repaired.

3, in the design should consider the jacket and hot oil touch area, so that the oil will not be due to heating temperature is too high and partially carbonized, this type of heating

Technical Parameters:

Additional voltage: Single phase 220V Three phase 380V

Surface heating power: ≤ 0.7/cm2 as design specification

Heat transfer temperature: ≤300°C

Operating medium: Minerals

Operating pressure: ≤0.8Mpa

Heater equipment size: φ81mm device is only suitable for thermal oil or heating effect of oil and medium heating applications.

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Product introduction:

The electric heating tube is also called a heating tube and a heating tube. The scientific name of the tubular electric heater element is that a wire-shaped heating wire (resistance wire) is placed in a metal tube, and an excellent heat resistance is filled in the surrounding and open space parts thereof. Thermal insulating and insulating insulating powder (MgO), both ends of the heating wire have lead-out rods or lead-out wires. It has a simple structure, high mechanical strength, high thermal efficiency, safety, reliability, simple equipment, long service life and other characteristics. Widely used in a variety of saltpetre tanks, tanks, oil tanks, acid and alkali tanks, melting metal melting furnace, air heating furnace, dry furnace, dry box, hot stamping die and other equipment.

The electric heating tube is an electrical component that converts electrical energy into heat energy because it is cheap, easy to use, convenient, and non-polluting. It is widely used in various heating applications.