Pre-fire ramp - Sacmi

Scheme of pre-fire ramp
INDUSTRIAL FURNACES
FOR CARBON PRODUCTS
9 9
12
11
10
3
16
5 17
7
3
2
1
13
14
15
8
1
Components
Coupling
7 Manometer
13 Ball cock
2 Hose 8 Orifice plate
14 Solenoid valve
3 Ball cock
9 Pressure monitor
15 Hose
4 Solenoid valve
10 Ball cock
16 Safety blowoff valve
5 Gas pressure
11 Zero pressure governors 17 Safety shutoff valve
6 Filters
12 Manometer
PRE-FIRE RAMP
RIEDHAMMER GmbH • Industrial kiln plants
Klingenhofstrasse 72 • 90411 Nürnberg • Germany
Telephone: +49 911 52 18-0 • Telefax: +49 911 52 18-231
e-mail: mail@riedhammer.de • www.riedhammer.de
C105_e_01/02/04

RIEDHAMMER has been an innovative partner for the production of carbon products for
decades.
Functional scheme
CARBON DIVISION
THE FUNCTION
For the production of high-quality anodes
the heating-up rate is a decisive factor for
obtaining excellent physical and eletrical
product properties. By using a pre-fire ramp
an optimum heating-up rate can be realized.
Thereby a flatter heating-up gradient is
rendered possible in the "critical" temperature
range between approx. 280 °C
and 460 °C on the product (degasifying
phase). This is a decisive factor for the
product quality.
Setpoint value curve
Flue gas transfer bend:
Modification of the furnace
draught
Expected
product curve
Burner ramps:
Modification of the fuel
supply
In the first section of the preheating zone
a steep gradient is adjusted on the product
up to a temperature of 250 °C
(see functional scheme).
The optimized heating-up in the first section
shortens the total baking cycle.
Pre-fire ramp:
Modification of the
fuel supply
Moreover the volatiles contained in the flue gases are partly burnt out leading to a reduced
Burner ramp (gas)
Burner ramp
(heavy oil / tar)
pollutant emission.
Pre-fire ramp (gas)
Flue gas transfer bend
THE TECHNOLOGY
Fire direction
Igniting and monitoring:
variable air. Thereby an optimum gas/air
TECHNICAL DATA
Since the pre-fire ramp works within a temperature
range below the auto-ignition temperature
of > 750 °C, automatic flame supervisors
are used. These automatic flame
supervisors permit an optimum ignition and
also ensure a flame monitoring by means
of ionization electrodes.
ratio and an efficient combustion is realized.
Operation mode:
Owing to the three available operation
modes, automatic remote-controlled operation,
local automatic operation and manual
operation, the system reaches a relia-
Number of burners
Burner power
Possible heating media
Calorific value
Inlet pressure
Connected load
1 burner per fireshaft
40 kW / burner
Gas (natural gas, producer gas,
coke gas and others)
2 500 - 14 000 Kcal / Nm³
150 - 4 000 mbar
6 kVA
Double operation safety:
bility of 100 % and permits flexible use.
All ramps are equipped with one additional
pressure measuring converter each which
releases the gas valves in connection with
the downstream arranged safety chain. In
case of a furnace draught failure, the main
gas valve is automatically closed.
Wireless system:
The pre-fire ramp is equipped with a wireless
link transmitting relevant data such as for
example temperature and pressure values,
burner functions etc. from and to the central
Switchboard with three operation modes:
Automatic, remote-controlled operation
Local, automatic operation
Manual operation
It serves for regulating the gas/air volume
in dependence of the setpoint tempera-
Switchboard
computer and the visualization system. The
ture value and for controlling all further
Economic baking:
system recognizes the position of the indivi-
electrical devices on the ramp.
The required gas flow is dosed in the pre-
dual ramps and integrates this information
It is constantly connected by wireless link
scribed ratio in dependence of the reference
in the control circuit.
with the central computer.