Electrical Pool Type Holding Furnace for Aluminum Smelting
1.Application
The electrical pool type holding furnace is mainly used for heat
preservation of nonferrous metals solution.
Structural Introduction
The pool type holding furnace consists of the following three parts:
furnace body, heating elements and electrical control system. The
upper part of the electrical control box is control circuit. The lower
part is power circuit.
The furnace body is comprised of charging hole, holding chamber,
discharging hole and furnace cover. The charging hole, discharging hole
and holding chamber are casted as a whole by 84ACX castable which is
produced by Allied Mineral Products. (compressive strength is 140MPA
when temperature reaches 110℃. The line rate is 0.1%) This kind of
castable has the advantage of aluminum non-stick, high strength, easy
clean and long service life. The furnace cover adopts refractory fiber
cotton with Janpnese brand which has good heat preservation performance
and easy maintenance.
The electrical control system adopts PID control with the intelligent
temperature controller, and the power regulator. The temperature
control accuracy is ±3℃. The holding furnace for die casting also
has the over-temperature alarm.
Power supply prepared by the buyer:
Power supply: 3-phase 5-wire , 380V±10%, 50Hz±3 Hz;
Control power: 220V±10%,50Hz±3 Hz.
2.Technical Parameters
| Technical Parameters | Unit | Model |
| WDL-BCD-1500 | ||
| Rated power | KW | 27 |
| Rated voltage | V | 380 |
| Connection method | Y | |
| Max temperature | ℃ | 850 |
| Working temperature | ℃ | 0-800 |
| Furnace surface temperature | ℃ | ＜30℃+room temperature |
| Frequency | HZ | 50 |
| Phases | 3 | |
| Temperature rising time for empty furnace | h | ≤3 |
| Pool capacity | Kg | 1500 |
| Furnace weight | kg | 5500 |
3.Heating system and electrical control system
3.1.Heating System
a)heating components—silicon carbide rod (6 pieces in total)
Control system: temperature controller (imported from Taiwan, 2 pieces),
electronic power regulator, contactor, relay.
Temperature sensing component: thermal coupling (2 pieces together,
1 for measuring the hearth atmosphere temperature and another for
measuring the molten aluminum temperature)
3.2.Electrical control system (PID control)
The thyristors are the main controlling component of the electrical control
system. The output current is controlled through the change of the
conduction angle of the thyristor. The electric aluminum holding furnace
employs the advanced phase control and firing circuit to control the conduction
angle of the thyristor. The temperature controller has various protection
functions. When the aluminum smelting furnace temperature rises over the
upper limit or the current is abnormal due to faults, the controller can
automatically stop pulse output, and stop power supply.
3.3. main technical parameters
a) working voltage: 380V 3 phases 50Hz;
b) control method: manual potentiometer regulation or automatic
control signal of 0-5VDC;
c) soft start-up function: moves started after 0.5 second;
d) Temperature control accuracy: ±5℃( under standard working conditions)
3.4.main electrical components
a) control cabinet, 1 piece;
b) temperature controller, Taiwan origin, 2 pieces (one controller
with PID regulation).
c) power regulator, 1 set;
d) low voltage electrical components, 1 set;
e) thermal coupling, 2 pieces (the piece measuring the molten
aluminum temperature is sheathed in a protection casing pipe);
