Herewith frequently asked questions and answers. If you have further queries please complete the 'Message Field' on our 'Contact Us' page and we will get back to you.
Instructions
Click on the question to view the answer, click on the question again to close the answer.
Q: How can we achieve optimised energy consumption?The areas are as follows:
a) Furnace design/furnace profile.
b) High tech control system.
c) Excellent combustion at the burners.
d) Well defined and executed delay strategies.
e) Excellent furnace refractory, burner and mechanical maintenance.
Q: How much time should be made available for the yearly shut-down?
for cooling down and 3 days for heating up.
Q: What do you understand under optimum combustion?
A: Optimum combustion should achieve the highest possible flame temperatures. This in turn
will give the highest heat transfer to the rolling stock. The heating media (gas/oil),
combustion air pre-heat and optimised oxygen control will determine the maximum
obtainable flame temperature.
Q: What is a good energy consumption on a reheating furnace?A: The energy consumption depends largely on the stock extraction temperatures. Usually
billet re-heaters have a lower extraction temperature and energy consumption varies between
1.0 to 1.2 GJ/ton. Slab re-heaters normally have a higher extraction temperature and energy
consumption is in the area of 1.4GJ/ton.
Q: With all the modern control systems installed on the furnaces is there still room
for improvements?
A: In principle there is always room for improvements. During investigations we usually see that the delay
strategies are not correctly defined and applied. Operators often have a very lenient approach towards inputting
and updating the relevant information. This does not only lead to unnecessary high energy inputs during furnace
idling times but also creates a thick scale layer. Usually the scale losses have a higher monetary value than the
energy input.
