BIOMASS CARBONIZATION PLANT
AGICO manufactures fully automatic & large capacity biomass carbonization plants with a daily output of 8-25 tons. Our advanced carbonization plants enjoy ex-factory prices.
What is carbonization? Biomass carbonization is the first step in the production of activated carbon. In the carbonization process, biomass materials are gradually heated under a certain low temperature and air isolation conditions so that the non-carbon substances in the material are reduced, finally producing carbonaceous materials suitable for the following activation process.
AGICO is a professional activated carbon plant supplier. We mainly adopt activated carbon rotary kiln and advanced carbonization process to realize high-efficiency biomass carbonization. In our biomass carbonization plants, we offer indirect-fired carbonization rotary kiln and direct-fired carbonization rotary kiln, two different carbonization processes for customers to choose from.
Indirect-fired Carbonization Rotary Kiln
When the biomass material is carbonized in the rotary kiln, a large amount of volatile gas is precipitated. These gases enter the incinerator through the pipeline to be heated and burned and then are fed back to the heating jacket outside the carbonization kiln to provide heat for the carbonization process through thermal radiation, so there is no need to provide additional heat sources.
Direct-fired Carbonization Rotary Kiln
When the biomass material is carbonized in the rotary kiln, a large amount of volatile gas is precipitated. The combustion point on one side of the kiln heats the gas and the gas heats the material by high-temperature radiation. The material in the bottom of the kiln is micro-oxygen contact, and will not be burnt out. An open flame is burning at the kiln top.
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Biomass Carbonization Process
The biomass carbonization process can be divided into two parts: biomass material carbonization and secondary utilization of exhaust gas.
1. Biomass Material Carbonization
Biomass material carbonization mainly takes out in a carbonization rotary kiln. In the kiln, the biomass material is gradually heated, and then undergoes a series of physical changes (dehydration and degassing) and chemical changes (polycondensation and pyrolysis). Finally, the carbonized material with a primary-pore structure is formed.
The appearance of the carbonized material should meet certain specifications and shape requirements, the internal structure must be the primary-pore structure, and at the same time, it should have high mechanical strength. The carbonization process can be divided into the following stages:
Drying Stage (<150℃):
At this stage, the external moisture and internal moisture of biomass raw materials evaporate by the heat supplied from the kiln, and the shape of the raw materials does not change at this time.
Pyrolysis Stage (150-300℃):
Raw material begins to decompose and releases gaseous products (such as CO, CO2, H2S, etc.), in addition to this, the chemical composition of the raw material begins to change. Different materials start pyrolysis at different temperatures.
Carbonization Stage (300-650℃):
Through polycondensation and thermal decomposition reactions, a large amount of volatiles is precipitated from the raw materials, such as tar, methanol, and ethylene. The material gradually softens and melts to form a colloid with three phases of gas, liquid, and solid coexisting. After that, it is transformed into semi-coke, needle semi-coke, or block semi-coke through the processes of flow, polycondensation, and solidification.
Cooling Stage (<50℃):
After the carbon is produced, it is rotated and discharged through the cooling tube on the rotary kiln, and then enters the water cooler, where it is water-cooled for about 3 minutes in an oxygen-free state. After that, it gets into the finished product silo through a closed air conveying device.
2. Secondary Utilization Of Exhaust Gas
The exhaust gas produced in the biomass carbonization process is mainly composed of two parts: the high-temperature gas produced by fuel combustion and the volatile components produced by material thermal decomposition. These gases contain small amounts of harmful substances, so they need to be treated before being released into the atmosphere.
AGICO carbonization plant mainly adopts combustion methods to treat exhaust gas. After the exhaust gas is discharged from the rotary kiln, it is sent into an incinerator to be fully burned at 800-950 ℃, so that the combustible gas and harmful substances are all transferred into CO2. The heat generated by combustion can be recovered by the waste heat boiler to generate steam.
AGICO Biomass Carbonization Machine
All production equipment in AGICO biomass carbonization plant adopts a PLC control system, which has small labor demand, controllable production quality, and safe operation.
Main Equipment Configuration: bucket elevator, screw feeder, feed bin, carbonization rotary kiln, waste heat boiler, cyclone dust collector, bag filter, water cooler, PLC control system cabinet, incinerator, draught fan, spray tower, chimney, etc.
* All of the above equipment is optional and customizable. The configuration is according to the customer’s production needs.
|Raw material||Moisture＜15%; Granularity:1-20cm; Ash＜3%;|
|Finished carbonized material||Moisture＜1%; Ash＜5%; Volatile component:15-18%; Granularity:1-10cm;|
|Temperature after cooling||＜50℃|
|Steam volume||1.5-3t/h (saturated superheated steam)|
|Steam flow rate||1.5-2.2t/h|
|Carbonization kiln inside temperature||＜650℃|
|Flue gas incinerator temperature||800-950℃|
|Induced draft fan||Power:40kW; Air volume:35000m³/h; Wind pressure:2530mpa;|
|Feeding method||Elevator & Screw feeder|
|Carbonization condition||Anoxic carbonization|
|Dust removal method||Cyclone dust collector + Bag filter + Spray system|
|Cooling method||Rotary kiln cooling pipe + Water cooling device|
|Equipment material||Q345 heat-resistant steel|
|Refractory material||Steel wire fibre castable,High aluminum refractory brick|
|Refractory material aluminum content||＞45%|
|Refractory material temperature resistance||＞1300℃|
|Flue gas volume||15000m³/h|
|Temperature sensing thermocouple||Quantity:5; Temperature resistance＞1200℃;|
|Carbonization Rotary Kiln Size (m)||Capacity (t/d)|
The output and equipment configuration of the AGICO carbonization plant can be customized according to the customer’s production needs.
AGICO carbonization rotary kiln adopts a special lifting plate design so that the material is heated evenly and the heat transfer efficiency is improved.
The whole carbonization plant adopts a PLC control system to realize automatic and efficient production, which can effectively avoid the probability of failure.
Our carbonization plant uses thermal radiation to heat the biomass material. The temperature can be adjusted by mixing high-temperature exhaust gas with low-temperature exhaust gas.
Part or all of the heat source comes from the heat released by the volatile gas combustion. The exhaust gas discharged after carbonization is recycled by the heat exchange device for drying and activation processes.
Highlights Of AGICO Biomass Carbonization Plant
Successful EPC Projects
|Location||Project||Quantity (set)||Annual Capacity (t)||Cooperation Method||Date|
|Thailand||Biomass carbonization plant||1||4000||EPC||2015|
|Guangzhou||Biomass carbonization rotary kiln||1||2000||EPC||2015|
|Uzbekistan||Biomass carbonization plant||1||1500||EPC||2016|
|Pakistan||Biomass carbonization plant||1||8000||EPC||2017|
|Yunnan||Biomass carbonization plant||2||6000||EPC||2018|
|Russia||Biomass carbonization plant||1||10000||EPC||2019|
|India||Biomass carbonization plant||1||8000||EPC||2020|
|Nigeria||Biomass carbonization plant||1||4000||EPC||2021|