Compact design and minimal heat losses

Features

The main advantage regarding the energy efficiency of Metso electric heater lies in very quick response time to fluctuating thermal demand. The electric elements are located in the bed of fluidized material inside a stainless steel tubes. The gap between the element and the inside of the tube is minimal hence the thermal resistance is very low allowing the heat to penetrate to the outside of the tube very easily. On the outside of the tube the constantly moving bed of mineral receives the heat generated by the elements in a rapid and very efficient process.

Benefits

  • Quick response time
  • One of the most important is its small size. The footprint of the EH 120 is only 1.000 x 1.350m x 2.600m high.
  • The heater can be hanging if required.
  • The live load of the unit is approximately 2250 kg.
  • The unit can be fitted into an existing pipeline with out loosing any height. In fact a height of 835 mm is gained after the heater is installed.
  • Year of experience with all types of incinerators & rotary kilns
  • Capable of installation anywhere in world
  • True understanding of process conditions
  • In house engineering for custom fit applications

Primary dust collection consists of a baffle chamber arrangement, which forms an integral part of the heater expansion chamber. The heated dust collected by the baffle chamber is mixed back with the heated bed product. The exhaust gases are then directed to a common baghouse dust collection system.

Control of the heating operation is automatic. A thermocouple in the fluidized bed controls the power input to the electric elements and hence the thermal requirement of the heater.

 

Metso electric heater advantage

The fluidized bed electric heater consists of a rectangular steel vessel separated by an air distributor or fluoplate. Ambient temperature air from the fluidizing fan is introduced into the lower portion (or windbox) of the vessel and enters the upper portion (or expansion chamber) via tuyeres in the fluoplate. The material to be heated is fed onto the fluoplate where it is fluidized and heated by electrical elements immersed in the bed of material. The heated material is discharged from the heater over a weir, onto a discharge conveyor.

The Metso EH 120 electric heater features high concentration of electrical elements in a relatively small volume (240 kW of energy is generated in the volume of 0.27m3) and hence the thermal inertia of the system is very low.

When the temperature or rate of the feed changes the thermal demand of the heater changes. Because the heat transfer from the elements to the bed is very fast the energy generated by the elements is adjusted immediately thus reducing fluctuations in the product temperature. In most Mineral Separation Plants such a fluctuations are very common. For every second that the product temperature is higher than set by the plant operator unnecessary energy is carried out by the product thus reducing the efficiency of the system.

Electrical heaters ranging from 67 to 330kW
Model Number
Max output [kW]
415VAC
Max output [kW]
525VAC
Fan [kW]
EH36
67
72
4.0
EH48
90
96
5.5
EH81
150
162
5.5
EH120
224
240
7.5
EH165
300
330
11.0

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