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Machines & equipment for sale

Carbolite High Temperature Heavy Duty Electric 600°C Oven

Stock No
OD2509J
Manufacturer
Carbolite
Model
Calcination Electric Oven
Year of Manufacture
2005
Condition
Excellent Condition, Seen powered at RSW
Internal Size (WxDxH mm) [?]
1200 x 1200 x 2500 mm
Max Temp
600°C
Other Info
4 Air Circ' Fans superb Temp Uniformity.
Location
Our Central Warehouse, Aldridge, UK
Weight (kgs)
4500
External Dimensions (WxDxH mm) [?]
3,190 x 2,057 x 3,350 mm high
Delivery
Your delivery options

Description

Carbolite high temperature, heavy duty 600°C oven with left hand opening door designed for calcination.

This specification covers the design and construction of a sealed chamber high temperature oven suitable for use in a batch production environment.

** Please watch the videos that shows a Carbolite High Temperature Very Heavy Duty Electric 600°C Oven machine on site and working in a production environment. This oven was sold to Pumped Heat by Riley Surface World primarily for R&D of their energy storage products. Included in the video is a time lapse of ramp up and dwell. Also included is a sequence showing drawings that support the electrical and mechanical recommissioning and re-purposing of controls systems undertaken by Pumped Heat. We would like to thank Pumped Heat for permission to film and their offer to share their experience recommissioning this ovens. **

Internal Dimension

The clear internal working dimensions of the chamber are 1200 mm wide x 2500 mm high x 1200 mm deep.

Thermal Performance

Ovens are designed to run at a maximum continuous working temperature is 600°C. The reproducible accuracy of the controller is better ±1°C and the temperature uniformity of the unloaded chamber is better than ±5°C at the maximum temperature. Total heater load 72kW.

Air Flow Characteristics

The air is circulated around the chamber by two centrifugal fans located one  above the other on each side of the chamber giving a total of four fans. An air guide system ensures that the airflow is generally horizontal across the chamber. Each fan is indirectly driven by a 1.5 kW motor. The fan shaft itself is fitted with a seal to prevent air leakage down the fan shaft tube. At ambient temperature each fan delivers approximately 24 cubic metres per minute. With four fans this  equates to 27 chamber volume changes per minute with an empty chamber.

Chamber Access

The oven is fitted with a one piece centrally pivoting door. After manual closing the door is  clamped by four pneumatic cylinders. The door clamps  are interlocked with the control system to prevent the oven door being opened during the process cycle and when the chamber temperature is above a present level. A temperature controller allows the door to be opened only below at present temperatures. The door is fitted with heat seals and a high temperature silicone rubber gas seal to prevent leakage of fumes into the workshop. A door switch is fitted to turn off the fans and heaters when the door is open. Voltage free   contacts are provided to send signals to indicate when the door is closed and locked. The oven is fitted with a Castell key interlock system to allow the door lock mechanism to be isolated when personnel are carrying out maintenance inside the chamber.

Shelves and Runners

The oven is supplied without any shelves or runners. It is designed to accepted stillages loaded into the chamber by a fork lift truck.

Internal Chamber Construction

The internal chamber is fabricated from grade 430 ferritic stainless steel. All metal works used inside the main chamber to form air guides and shelf runners are also fabricated from 430 grade stainless steel.

External Construction

The main outer case is fabricated from mild steel rectangular hollow section and panelled with zinc coated mild steel sheet folded and sealed to form a gas tight enclosure.

Thermal Insulation

The oven is insulated with high quality ceramic fibre and mineral wool blanket to ensure a safe outer case temperature.

Heating System

The chamber is heated by mineral insulated metal-sheathed elements. The low surface watt loading of the elements ensures a long and reliable service life.

Chamber Ventilation

The oven is fitted with an exhaust fan to remove air from the chamber on a continuous basis during the heat up and dwell part of the process cycle. Fresh air is drawn in through a fixed aperture in the inlet damper assembly. The exhaust  fan is rated at 3 cubic meters per minute discharging directly to atmosphere.

Based on the chamber volume being 50% occupied this gives approximately two air changes per minute. The purpose of the exhaust fan is to enable a slight negative pressure to be maintained even if the main extract duct fan fails.

Cooling System

An air inlet vent is provided to enable the cool down rate of the oven to be significantly increased. The air is supplied to the inlet vent via a speed controlled inlet blower fan. The inlet blower and damper assembly are  mounted on the top  of the oven.

The cold air enters the oven behind a baffle plate where it mixes with the recirculating air before entering the workspace. Air is discharged  through  a port on the top of the oven. Pneumatically operated fail closed butterfly dampers are included to close off the inlet and exhaust vents when the cooling facility is not in operation. The inlet blower fan is capable of delivering 27 cubic  metres  per  minute against a static pressure of 250 Pascals. The inlet blower fan is  fitted with a variable speed drive so that its performance may be automatically adjusted to achieve controlled rates of cooling. The fan performance quoted is based on the exhaust vent discharging directly to atmosphere. If the exhaust vent is connected to extract ductwork that itself includes an extract fan then the amount of exhaust air passing through the chamber may well increase.

Temperature Sensors

The chamber temperature is sensed by a type "K" mineral insulated metal- sheathed thermocouple. The chamber is divided into four individually controlled zones. In each zone there are two thermocouples, one for the main controller and one for the over temperature controller. A further four thermocouples are provided to give temperature indication in other parts of the chamber. These terminate in standard thermocouple sockets on the control panel.

Temperature Control

Each of the four zones is controlled by a Eurotherm 3508 single setpoint PID temperature controller. The instruments have the facility to accept a 4-20mA remote setpoint from a master time/temperature programmer supplied by others. Each of the controllers is able to transmit its measured value via a 4 – 20mA current output. The purpose of the 4 zones is to ensure temperature uniformity throughout the chamber. It is not possible to run the oven with significant temperature differences between the zones.

Over Temperature Control

Each zone has its own independent over temperature circuit. A Eurotherm 3116 solid-state on/off controller will switch off the heating elements if a fault causes the set temperature to be exceeded. If any of the over temperature circuits trip then the whole oven heating circuit is shut down. In an over temperature condition an audible alarm sounds and an indicator illuminates. A pair of voltage free contacts is provided to send a signal to an external annunciator.

Power Control

The power to the heating elements is controlled by three phase thyristor based solid-state relays. The control system works silently with no mechanical parts to wear out. The fast cycle zero voltage switching mode of the solid-state relay gives good control and reduces the generation of radio frequency interference.

Chamber Sealing

The air tightness of the oven is achieved by sealing the outer case. This arrangement has been chosen in preference to sealing the inner chamber because there is a requirement to provide expansion joints in the inner panels due to the large size and high working temperature. Where the elements and thermocouples pass through the case they are sealed by compression fittings. The fan shafts are fitted with twin lip seals to prevent fumes leaking out.

Location of Controls

All the temperature controllers, and power control equipment is housed within the oven casing, opposite the door hinge.

Power Supply Requirements

The installed heating power rating of the oven is 72 kW. The installed fan power is 6.55 kW giving a total power rating of 78.55 kW. It requires a 415 volt three phase and neutral supply rated at 125 amps per phase.

Stand

The oven has an integral stand to raise the oven approximately 300 mm above floor level.

 Finish & Guarding

The oven interior has a natural finish. The external case panels and control panel are finished in light grey epoxy/polyester powder paint with the main external frame wet sprayed with dark grey two pack epoxy paint.

Overall Dimensions

The approximate external overall dimensions are 3190 mm wide x 3500 mm high x 2057 mm deep. Estimated weight is 4500 kgs. For shipping purposes the height can be reduced to approximately 3400 mm by removal of the exhaust fan, dampers and air inlet blower.

Calcination

Calcination (also referred to as calcining) is a thermal treatment process, in presence of air or oxygen, applied to ores and other solid materials to bring about a thermal decomposition, phase transition, or removal of a volatile fraction. The calcination process normally takes place at temperatures below the melting point of the product materials.

pdf icon Print / Download Carbolite High Temperature Heavy Duty Electric 600°C Oven Datasheet

Photographs taken prior refurbishment. Our refurbishment service is not available on all machines.