Equipment Details

CT – Conductive Trough

Unlike conventional radiant heated troughs, the conductive trough (CT) uses cartridge type electric resistance heaters contained within heat transfer tubes that are cast directly into the sidewall of the trough. Heat application is direct and exclusively sub-surface. The sidewall consists of a three component refractory package using a metallophobic and extremely durable silicon carbide working liner in the form of a pre-cast kiln fired insert. This insert contains 20 individual heaters per linear meter of trough. A backup lining and state of the art low-density microporous insulation, for freeze plane containment and low shell temperature, supports the insert. A typical shell temperature is 49 ˚C (120 ˚F) at 21 ˚C (70 ˚F) in still air (natural convection).

The lid design of a CT is simplified relative to a radiant trough. Electrical connections to the lid assembly are not required because the heat source of the CT is not contained within the lid structure. Heat losses are minimized by prudent design and lightweight insulating materials. Moreover, pneumatic assist and/or counterweights are not required since the lid shell is made of aluminum. Importantly, CT lids can be raised without interrupting electrical power, and the operator is not exposed to the red hot heating elements, as is the case with radiant trough lids. The cover lifting mechanism allows one person to completely lift the hinged cover. A safety device may be incorporated to prevent the lid from unintentionally closing. CT heat losses under isothermal conditions results in a measured power consumption of 1724 W/m (526 W/ft) at a metal holding temperature of 760 ˚C (1400 ˚F). Such losses are reduced with decreasing holding temperature. Since each meter of CT has in excess of 7500 W (2287 W/ft) installed heating capacity, a 1.8˚C/m metal temperature increase can be expected at 9 t/h (20,000 lb/h) metal flow rate.

Benefits

  • Low energy consumption;
  • Metal quality retention;
  • Sub-surface conduction heating;
  • Uniform temperature throughout metal depth;
  • Precise temperature control;
  • Isotherm holding capabilities up to 1450 ºF (790 ºC);
  • In-line metal heating capabilities;
  • Cool lid and wall temperatures;
  • Longer refractory life;
  • Vitual skimless;
  • Low maintenance;

Properties

Feature Unit Value
Operating Temperature ºC 750
Cold Face Temperature ºC 50 - 80
Capacity kgAl/m 37 or 95
Length (std. segment) mm 1830
Width mm 750
Height with lid mm 890
Heating elements pc/m 20
Installed Power kW/m 7,46
Energetic Consumption kWh/h.m 2
Voltage VCA 380
Phases - 3
Control - PID Dual-Loop Cascade
Communication - Modbus, RS485
Updated date: 09/09/2016