VT CORP’s Technology

The VT CORP Indurating Machine is basically an endless chain of pellets. The lifting wheel guides the pellets up onto the rails of the upper strand, and the lowering wheel guides them down again at the discharge end onto the rails of the lower strand. Each Pellet consists of two end sections & a center part. The end sections incorporate the running and pressure rolls. The Indurating machine has wind boxes, connected to the process gas/air lines and fitted with dust removal equipments. Wind boxes are equipped with motorised throttle dampers, so as to be able to adapt the flow of gases in these sections to the process requirements. All wind box pipes are fitted with compensators to allow for thermal expansion between the wind boxes and gas mains. Vaned sealing plates between the wind boxes are position in certain area, where the gas flow reverses. These sealing plates restrict the extent to which the gases take shortcuts at these points.

Above the Indurating machine, hoods with refractory material are installed. Burner chambers are arranged along both sides of the hood in alternative sections. These Burner chambers are connected to the direct recuperation line via connecting pipes.

Dividing walls with refractory cladding are situated between various zones in the hoods. To restrict the movement of infiltrating air or process air between hood and moving pellets to a minimum, sealing air is blown in special sealing elements. Cooling water system is installed to cool the traveling grates. Burners with flame detectors are installed for firing of fuel from burner hoods.

Use of a single unit for pellet drying, preheating, firing and cooling:

Pellets remain undisturbed throughout the entire process (including cooling).
Uniform heat treatment.
Minimized dust and fines generation.

Several burners in preheating and firing zones:
Superior process flexibility.
Adjustable temperature profile.
Adaptation of different firing profiles to changing raw materials.

Stationary refractory, grate maintenance off-line:
Low maintenance costs and high availability.

Several recuperation techniques:
Low specific heat consumption.

Heat transfer by convection instead of radiation

Uniform heat treatment, leading to uniform product quality.

Straight-Travelling-Grate-Technology, offered by us, has its inherent advantage that it can be used with any available iron ore as against any specific iron ore by Chinese Grate Kiln Technology.