High Manganese Gas Fired Steel Heat Treat Furnace Car Bottom Furnace 7200×2200×1800mm
1. Application
The gas fired bogie hearth heat treat furnace is mainly used for heat
treatment of metal parts.
2.Structural Introduction
2.1 furnace body
The body of bogie hearth furnace for heat treatment of metal is made from
12# -18# channel steel and 4-14mm steel plates. The side pillar and back
pillars are made from sectional steel, and are reinforced with sectional steel
bracings. The external wall of the furnace is painted with 2 layers of primers,
and 2 layers of coating paint. The key part of the furnace is painted with
heat resistant paint.
2.2 lining
The lining material is 1100℃ 1360type high aluminum refractory fibre
compacted block. This refractory lining structure has the advantages of low
heat conductivity, strong anti-shock capacity, and anti-erosion. Aluminum
silicate fiber compression block with thickness of 350mm is designed as
the high temperature refractory layer.
The total thickness of the furnace lining is 325mm. The lining adopts
composite large module structure and stainless steel round steel fixation technology.
The lining at high temperature section adopts aluminum silicate fiber
compression block, the thickness is 300mm.
2.3 bogie
The car bottom furnace design is comprised of heat preservation material,
bogie frame and moving mechanism. The refractory layer is divided into 3 sub-layers,
i.e., 1st top high-alumina brick layer, and 2nd and 3rd layer with both light clay bricks.
The bogie framework is made of 20# I-steel beam and 20# I-steel beam. The edges
of the bogie are made of 20# channel steel. The bogie is equipped with 10pieces of
wheels. Each wheel diameter is 350mm.
The car bottom furnace price is driven by motor reducer gear driving mechanism.
The moving speed of the bogie is 6-8m/min.
2.4 Sealing System
The sealing between
the bogie hearth furnace door and the furnace body uses the electric push rod to press the closed
furnace door on the furnace door frame and the end face of the trolley.
2.5 furnace door
The furnace door is comprised of all-fiber lining and steel structure shell.
2.6 burning system
The burning system is comprised of Krom technology high speed burners, proportional
combustion control system, gas valve, solenoid valve, burner control box, etc. The
burner has the functions of automatic ignition, flame detection, and flame out alarm.
The burner controller receives the control signal of the temperature controller and
controls the large/small fire status of the burner based on the heat load requirement
so that adjustment of the temperature is realized.
2.6.1 air system
The air piping system is comprised of high pressure centrifugal fan, automatic
regulation valve, pressure gauge and pipes. The air volume is to match the gas
volume, and the air excess rate is lower than 1.20.
2.6.2 gas supply system
The general gas supply pipe is equipped with a pressure regulation device
(equipped with a filter), a low pressure switch and a pressure gauge. For the sake
of safety there is one fast cut-off valve on the general gas pipe.
2.6.3 discharge system
The heat treating furnace pressure is controlled
in the optimum state (the surface of the trolley is in a slightly positive pressure). At this
time, the exhaust gas is in a dynamic equilibrium state, which can not only ensure that
the furnace gas does not overflow, but also ensure that the cold air outside the furnace
is not sucked into the furnace, so as to save energy and maximize the efficiency
of the furnace.
2.6.5 Heat exchange and flue system
A flue is set at the back of the furnace, and it is carried out with the heat exchanger
(according to the national standard GB3486-83). The flue leads to the outside of the
factory building.
2.6.6 fault detection and alarm system
The heat treatment furnace has a complete fault detection, alarm, diagnosis, and safety protection
system. On the control cabinet there is an alarm lamp.
2.7 control system
control system has the following parts: Ⅰ. Burning control system; Ⅱ. Electrical
power control system; Ⅲ.temperature control system .
C) temperature control and record system
The system has the functions of temperature setup, control and digital display.
And also there is an audible and visual alarm at over-temperature situations.
Temperature control zone arrangement
A:temperature control system
B: instrument temperature control
3. Main Technical Parameters
| No. | Item | Technical Parameters |
| 1 | bogie hearth furnace effective working size |
7200*2200*1800mm (excluding the height of support iron) |
|
2 |
Furnace hearth size |
7600*2600*2300mm (including the height of support iron) |
| 3 | Bogie loading capacity | ≤20ton |
| 4 | Max working temperature | 1050℃ |
| 5 | Furnace body surface temperature | ≤45℃+room temperature |
| 6 | Max temperature rise speed | 200℃/hour at full loading capacity |
| 7 | Temperature measurement accuracy | ≤±1℃ |
| 8 | Temperature uniformity | ≤±10℃ |
| 9 | Heating zone | 4 zones |
| 10 | Fuel | Natural gas |
| 11 |
fuel gases calorific value Gas pressure before furnace |
8600kcal/m3 20-70Kpa |
| 12 | Temperature control method |
Shimaden Intelligence temperature controller, 10 inch touch screen+Siemens PLC and manual control; |
| 13 | Temperature record | K type thermocouple in the furnace hearth |
| 14 | Hot air pipe surface temperature rise | ≤30℃ |
| 15 | Bogie moving speed | 6-8m/min, with manual operate remote control |
| 16 | Furnace door sealing method | By electric push rod, 4 sets |
| 17 | Furnace door opening method | Electric up and down , speed 6-8m/min, with manual operate remote control |
| 18 | Furnace lining | heat resistant all fiber structure |
| 19 | Gas burner |
AGS100HB burner, 230KW/h, 8pcs (German technology) |
| 20 | Consumption index | Heat efficiency at full load η≥40% |
| 21 | Furnace door surface temperature | ≤50℃+ room temperature |
| 22 | Full power gas consumption | 136Nm3/h |
| 23 | Gas pipe line demand | 185Nm3/h |
| 24 | Air consumption | 2392Nm3/h |
| 25 | Bogie motor power | 7.5KW*1 set |
| 26 | Combustion fan power | 7.5KW |
| 27 | Bogie transmission method |
Motor reducer sprocket drive Bogie wheel moving method: remote control |
| 28 | Sealing between bogie and side wall | Electric push rod, 4sets |
| 29 | Sealing between bogie and back wall | By spring fiber blocks |
