Product Description

Low-temperature Rotary Carbonization Furnace

1. Operation Principle of Rotary Carbonization Furnace

The furnace carbonizes materials through a destructive distillation process at a low temperature. In the process, materials are heated gradually to form maximum amount of fixed carbon in cage structure though an ordered pyrolysis of plastic mass in them. Graphitization is prevented by the
low terminal carbonization temperature, which provides the activating reaction comes next with more C-H chemical bonds available in carbonized materials.
II.  Process of Carbonization Furnace
Retorting gas (volatiles) generated from pyrolysis of materials in the furnace is injected into the combustor through a tube. and the high-temperature waste gas generated from the combustion is injected into the external heating jacket to provide heat required by carbonization, cutting extra heat demand, saving fuels, and reducing gas emission.
1)Process of Materials
●Materials are put into feeder bin through feeding inlet, conveyed into materials channel of carbonization furnace stack by the screw feeder in feeding bin, and moved towards the discharge outlet following rotation and gradient of the stack.
●Materials go through pre-drying at **0°C,and then pyrolysis and pre-carbonization at ******0°C to expel moisture and pyroligneous liquid before the carbonization at ******0°C.
Temperatures mentioned above are material temperatures. During the process, materials are carbonized in the furnace by heat radiation to discharge volatile organic gases before discharged through output bin.
2) Process of Gas
A mass of volatile gas and liquid are separated out from materials being heated and carbonized. Volatile gas is induced into combustion chamber through a tube after flowing reversely with materials. Temperature of the tube must be above **0°C. Excess-oxygen combustion of the volatile gas with air supplied through an air distribution tube releases a large quantity of heat, and high-temperature waste gas generated thereby is induced into the heating jacket of carbonization furnace stack through the specialized tube, providing heat required for materials carbonization by radiation. Low- temperature gas ejected by the furnace stack flows into the end gas treatment device through the heat exchanger and end gas exhausting tube.
Tubes and devices mentioned above must have resistance against high-temperature and corrosion.
 
III. Feature of Carbonization Furnace
1) High-temperature waste gas
●At the normal final temperature of carbonization, which is between ******0°C, volatile gas in external thermal carbonization furnace is inflammable with exposure to oxygen, flame generated thereby would transmit heat to materials, even ignite them. Temperature of flames is around **0°C, and temperature of materials could hardly be controlled below ******0°C as required. Excessively high temperature would form an ordered graphite crystal structure, shrink interspaces among microcrystals, and thereby compromise the pore-forming process.
●The design adopted a material channel with high-temperature waste gas radiation to avoid flames, which offers an adjustable temperature of waste gas, a controllable carbonization temperature, and a higher carbonized material quality for the benefit of activation process next.
2) Deferred carbonization at low-temperature
●Prolonged duration offers low-temperature pyrolysis with a high selectivity. Initial pyrolysis breaks weak bonds in material molecular to generate free radicals which form liquid plastic mass. The deferred heating process allows such plastic mass to fully diffuse in materials and react with them. Climbing temperature urges further pyrolysis of the plastic mass to form a aromatic nucleus structure with higher stability among coal granules, which provides sufficient bonds among materials, and thereby reduces yield of volatiles from pyrolysis for a higher yield of carbonized materials.
3) Reverse flow of volatile gas and materials
●Heat required for pyrolysis of materials in the channel is provided by radiation, volatile gas generated thereby flows in the direction from feeding end to discharging end along with materials while being heated gradually. The process is free of volatile gas coagulation and agglomeration. Yet, carbonization temperature in the furnace is crucial at this point. since a minor deviation would cause a blockage in the fume channel. Temperature of materials must be
controlled at a level above **0°C, and temperature of fume channel above **0°C by a thermocouple sensor.
●Aromatic compound in the volatile gas works as a recarburizer in the heat condensation stage of carbonization in high-temperature section of the furnace, unstable chemical bonds in carbons generated thereby will accelerate the subsequent activation reaction, and form more pores;
4) Structure of carbonization furnace
●Channel structure of the furnace allows materials to be distributed evenly (**0° ) in the channel for a larger heating area, longer heating duration, and thus a more sufficient absorption of heat.
●Even distribution of materials in the furnace, and the low stacking height provided by the lifter reduces internal abrasion of materials, decelerates sliding of materials following rotation of the furnace stack, and thereby lowers impact force of materials. Hence, breakage of materials in the softening phase is limited.
5) Special design of lifter blade
●Heat transferred from fume is deferred by the lifter blade mounted in material channel, which is designed for evenly heating, before solidified materials are conveyed into high-temperature section;
●Position of lifter blade shall be determined with consideration of circular distribution of temperature in the material channel. Lifter blade in a low-temperature position allows even distribution of materials on the inner surface of channel, facilitating sufficient heat absorption and heat transfer efficiency in the channel.
 
 
 
 
 
 

Country:	China
Model No:	Justfine-1003
FOB Price:	(Negotiable) Get Latest Price
Place of Origin:	-
Price for Minimum Order:	-
Minimum Order Quantity:	1 Set
Packaging Detail:	-
Delivery Time:	-
Supplying Ability:	-
Payment Type:	-
Product Group :	-