Heating and heat-treatment furnaces

HEATING AND HEAT-TREATMENT FURNACES

NKMZ manufactures and supplies complete sets of the following furnace types:

Car-bottom and fixed-bottom chamber-type furnaces;
Cover-type furnaces;
Rotary-hearth furnaces;
Continuous roller-hearth or walking-beam furnaces;
Vertical furnaces;
Conveyor-type furnaces;
High-speed heating furnaces.

Design-features of these furnaces meet the latest world's market requirements, namely:

High accuracy (+5°C) and Uniformity of heating;
Metal cooling within a wide range of speeds and temperatures;
High reliability of the parts and assemblies;
Availability of modern gas burners including high speed burners integrated with the cooling air feed tnyeres;
Automatic-operated burner devices provide almost complete fuel combustion;
High-speed burners provide high rates of the combustion product exhausts and almost complete fuel combustion both in the continuous and pulse modes;
Specific facilities are employed to pressure tight the furnace working areas;
Up-to-date low inertia fibre materials and heat resistant concrete are used for the furnace refractory linings;
Automatic heat control facilities provide the furnace heat mode stability through the use of the power-saving algorithms and the shop data network.

The advanced designes adopted in such furnaces enable to:

Improve finished steel product quality;
Shorten the heat treatment cycle;
Save fuel within 40%;
Secure the furnace environmental safety.

NKMZ provides designing, manufacture, supply and erection of the equipment and fiber-type refractory linings as well as commissioning and staff training.

CAR-BOTTOM THERMAL FURNACES

This type of furnaces is designed for precision heat treatment of products based on the efficient pulse heating and cooling system through the aid of the advanced gas burners fitted with the electric lighting and flame control facilities built in the cooling air feed tugeres.

The furnace comprises the following components:

Furnace binding;
Car-bottom hearth on wheels fitted with the frame plates and lift gate employed to seal its front, rear and side faces;
Working door fitted with the gate lifting and water-cooling facilities;
Hearth track;
Hearth wheel out mechanism;
Gate lifting device;
Servodrive;
Gas and air supply facilities;
Smoke exhaust facilities;
Electric equipment;
Instrumentation.

Advantages:

Product heating and cooling uniformity (within + 5°C);
High output;
High efficiency (fuel saving within 40%).

TECHNICAL DATA

Parameters	Values
Hearth size, m	3.2×8.0	3.9×10.5
Metal heating temperature, °C	1000
Charge size, ton	100	180
Fuel type:	natural gas
- Calorific power, MJ/m³	34
Max. fuel flowrate, m³/hr	400	600
Burner type	GBC-40	GBC-60
- No. of burners, pcs	10	12
Max. combustion air flowrate, m³/hr	4000	6000
Max. cooling air flowrate, m³/hr	13000	22000
Required gas pressure upstream of the burner, kPa	8.0
Required air pressure upstream of the burner, kPa	7.0
Combustion air preheating temperature, °C	200
Jet recuperator type	panel-type
- No. of recuperators, pcs	4	6
Max. combustion product amount, m³/hr	4500	6600
Shop heat emission, kW	170	250
Max. water flowrate, m³/hr	4	4.5
No. of temperature control zones	3