Unitherm Cemcon - Hot Gas Generators

UNITHERM CEMCON Hot Gas Generators (HGG) are designed to be used for drying applications for:

Coal grinding plants
Cement mills
Raw mills
Mineral drying plants

Hot Gas generators in different designs are available. On the one hand HGG‘s for low outlet temperatures, fabricated of heat resistant steel, with the advantage to save refractory costs.
When high outlet temperatures are demanded we also provides HGG‘s designed with combustion chamber, totally lined with refractory. All HGG‘s can either be installed horizontally (most common) or vertically. Coal fired HGG‘s are exclusively horizontally executed.

Fuels in use are:

Heavy fuel oil
Light fuel oil
Diesel, Waste oil
LPG
Natural gas
Landfill gas
Corex gas
Several Low Caloric Gases
Pulverized Coal
Petcoke
Solid alternetive fuels

Type HR

Hot gas generator for liquid and gaseous fuels for hot gas temperatures up to 400°C.
Fresh air or air from a process up to 100°C can be used as dilution air.
Performance 1-20 Gcal/h.
Horizontal or vertical installation.

Hot gas generators of “type HR” consists of a burner muffle and a chamber of several air layers, mainly fabricated of heat resistant steel. The burner muffle, used only for flame forming and stabilizing, is lined with compacted refractory or with bricks. Gaseous or liquid fuels are used as combustible. Commonly horizontal HGG designs are installed, but vertical designs are also possible. The flame is generated by a standard monoblock burner when standard fuels are in use, or by a tailor made Unitherm burner for special gases. The prevailing temperature in the burner muffle is about 1000°C. The dilution air is introduced by the encasing housing of the HGG. Right at the end of the burner muffle the cold dilution air is mixed with the hot combustion gases. This mixing is performed two (or three) times. The dilution air flow depends on the desired outlet temperature (direct mixing) of the HGG.

Design features:

High efficiency
Quick start and stop
Low cost design (less refractory)
Low weight
No emergency chimney needed
Preheated process air can be used as dilution air

Technical Data:

Dilution air: Fresh air -15/+45°C
Process air: Up to +100°C
HGG outlet temperature: Up to +400°C
Performance: 0,5-20 MW
Hot air back pressure: -10mbar / +15mbar

Type HG-Standard

Hot gas generator for liquid and gaseous fuels for hot gas temperatures up to 1000°C.
Fresh air or air from a process up to 300°C can be used as dilution air.
Performance 1-20 Gcal/h.
Horizontal or vertical installation.

Hot gas generators of “type HG-standard” are basically designed as combustion chambers with an encasing cooling air channel, This construction is mainly fabricated of carbon steel. The combustion chamber is generally lined with compacted refractory and partly with bricks. Gaseous or liquid fuels are used as combustible. Commonly horizontal HGG designs are installed, but vertical designs are also possible. The flame is generated by a standard monoblock burner when standard fuels are in use, or by a tailor made Unitherm burner for special gases. To limit the furnace temperature to about 1000°C a part of the dilution air is added to the combustion air to provide a high air excess. This air is introduced by a separate chamber on the HGG, which is equipped with several nozzles located around the circumference of the combustion chamber for air intake. The other part of the dilution air is primarily used for cooling of the combustion chamber surface and thereafter mixed with the combustion gases at the exit socket of the HGG in dependence of the desired outlet temperature (direct mixing).

Design features:

High efficiency
Large heat storage capacity
High outlet temperature possible
Preheated process air can be used as dilution air

Technical Data:

Dilution air: Fresh air -15/+45°C
Process air: Up to +300°C
HGG outlet temperature: Up to +1000°C
Performance: 0,5-40 MW
Hot air back pressure: -10mbar / +15mbar

Type HG

Hot gas generator for liquid and gaseous fuels and for coal dust for hot gas temperatures up to 1000°C.
Fresh air or air from a process up to 300°C can be used as dilution air.
Performance 1-80 Gcal/h.
Horizontal or vertical installation if gas/oil fired, vertical installation when coal dust fired.

Hot gas generators of “type HG” are designed as combustion chambers, mainly fabricated of carbon steel. The combustion chamber is generally lined with bricks in different layers and partly with compacted refractory. When fired with solid fuels like coal, the HGG is strictly executed in vertical design to enable ash removal. When fired with gaseous or liquid fuels only, a horizontal design is commonly used. The flame is generated by a standard monoblock burner when standard fuels are in use, or by a tailor made Unitherm burner for coal or special gases. To limit the furnace temperature to about 1000°C a part of the dilution air is added to the combustion air to provide a high air excess. This air is introduced by a ring chamber (on top of the HGG) which is equipped with several nozzles located around the circumference of the combustion chamber for air intake. The other part of the dilution air is mixed with the combustion gases at the exit socket of the HGG in dependence of the desired outlet temperature (direct mixing).

Design features: