High Performance Industrial Metal Melting Furnace For Aluminum Cans Carbonization And Paint Removal

High-Performance Industrial Metal Melting Furnace for Aluminum Cans Carbonization and Paint Removal

1.Overview of the Process Scheme

The working process of the whole set of equipment: raw materials —

belt conveyor — crusher — belt conveyor — screw conveyor — horizontal

carbonization machine — discharger — finished products; the whole set of

equipment is equipped with 1 cyclone dust collector, a set of Venturi dust

collector, and a flue gas condenser. The following briefly describes the whole

process from feeding to discharging: In this set of processes, first, the

aluminum cans are conveyed to the crusher by the belt conveyor. After being

crushed by the crusher, the aluminum cans are sent to the carbonization

machine by the screw conveyor for carbonization and paint removal. The

combustible gas emitted during the carbonization process is led outside

the carbonization machine and ignited to provide continuous heat for the

carbonization pyrolysis. At this point, the aluminum cans after carbonization

and paint removal are turned into aluminum sheets.

Overview of Carbonization: The main body of the carbonization machine

consists of two nested inner and outer cylinders. During operation, the

materials enter the inner cylinder for carbonization treatment. Since the heat

source is located in the high-temperature area in the middle of the outer

cylinder and directly heats the inner cylinder made of 304S material, the

temperature of the cylinder will reach about 700 degrees Celsius. After

preheating, the materials slowly pass through the high-temperature area

and undergo pyrolysis and carbonization reactions. The carbonization

machine is equipped with a variable frequency speed-regulating motor,

which can adjust the rotation speed of the cylinder at any time to control

the carbonization temperature and time of the materials. In this process,

our goal is to make the materials undergo a high-temperature carbonization

reaction, and we cannot allow excessive oxygen to participate in the reaction.

Therefore, sealing is particularly important. For this machine, we adopt a

sealing type of labyrinth plus high-temperature resistant ceramic fiber packing,

which can better adapt to the axial displacement of the cylinder and the

circumferential ovality, so that the ceramic fiber packing can always be in

contact with the cylinder, thus achieving a good sealing effect. This sealing

is mainly located at the contact part between the feeding bin and the inner

cylinder, and the contact part between the discharging bin and the outer and

inner cylinders. The feeding screw conveys the materials to the inner cylinder

of the main machine. Since a large amount of water vapor will be generated

when the materials are carbonized in the inner cylinder, this water vapor needs

to be discharged in a timely manner. Therefore, an exhaust gas pipeline needs to

be set at the top of the feeding bin, and the exhaust gas is pumped to the dust

removal equipment by the induced draft fan for dust collection treatment. The

high-temperature exhaust gas in the heating furnace of the equipment is collected

and cooled by the primary dust removal equipment (cyclone dust collector) and

then enters the secondary dust removal equipment (selected components) for

further dust collection treatment before being discharged into the air. Finally, the

finished products are conveyed by the screw conveyor at the lower part of the

discharging bin to the next cooling process for cooling treatment. After the

cooling treatment, they are then packaged and formed. The materials processed

by the carbonization machine have a temperature of about 300 degrees Celsius.

During the entire cooling process when they enter the cooler, a sealing structure

similar to that of the integrated machine is required to isolate the air to prevent

spontaneous combustion. "Material sealing" is adopted at the discharging

screw to prevent air from flowing back. As for the negative pressure problem

after the cooler cools down, in this set of processes, it is considered to connect

the sealing end head of the cooler to the inner cylinder of the integrated machine

for compensation. After the problems of the cooler's sealing and pressure

compensation are solved, the cooling water continuously circulates and cools down

under the action of the water pump, gradually cooling the finished products to about

30 degrees Celsius, and then they are pulled out by the screw conveyor for standby.

This equipment makes full use of the pyrolysis of biomass and the waste heat of flue

gas to dry the materials; by optimizing and centrally designing multiple channels such

as the tail gas collection channel of the hot blast stove, the heat energy collection

channel of carbonization pyrolysis, and the flue gas collection channel, the heat energy

utilization is improved, thus achieving environmental protection and energy conservation.

2.Main Technical Parameters of cans decoating machine

3.Supply Scope