Explosion proof electric heater is a type of explosion-proof electric heating equipment specially designed for flammable and explosive environments. Its core feature is that it can effectively prevent sparks or high temperatures generated by internal electric heating elements from igniting surrounding explosive gas mixtures.

When selecting explosion-proof electric heaters, it is necessary to comprehensively consider factors such as explosion-proof performance and heating requirements to ensure safe and reliable operation. Here is a detailed purchasing guide:

1. Clearly define the usage environment and explosion-proof requirements

Explosive environment classification:

Gas/vapor (such as methane, hydrogen): must comply with Ex d IIB or Ex d IIC rating.

Dust environment (such as coal powder, aluminum powder): choose anti dust ignition type (Ex tD).

Regional division:

Zone 0 (continuous presence of explosive gas): requires special design (such as intrinsic safety+explosion-proof composite).

Zone 1/Zone 2 (occasional or short-term presence): Conventional explosion-proof type (Ex d) is sufficient.

Temperature group (T1-T6): Select based on the ignition point of the gas, such as T4 or above (surface temperature ≤ 135 ℃) for hydrogen environments.

2. Determine heating requirements

Power calculation:

Calculate the required power based on the heating medium (air, liquid, solid), target temperature, flow rate/volume (formula: power=specific heat capacity x mass flow rate x temperature rise).

Example: Heating air flow rate of 1000m ³/h, temperature rise of 50 ℃, requires about 15-20kW.

Heating method:

Pipeline heating: Choose flange or threaded installation, and consider flow rate to prevent dry burning.

Container heating: Immersion type (with explosion-proof junction box) is selected.

Space heating: explosion-proof fan (circulating heat dissipation) is required.

3. Key performance parameters