Detailed introduction
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Sludge Incineration:
Under conditions of enriched oxygen and specific temperatures, water (H₂O) evaporates from the sludge. Organic matter reacts with oxygen (O₂) to produce gaseous byproducts such as water vapor (H₂O) and carbon dioxide (CO₂), along with solid residues. This process serves as a primary method for sludge reduction and disposal.
Sludge Pyrolysis:
By exploiting the thermal instability of organic matter in sludge, it is heated under anaerobic conditions to induce thermal cracking of organic compounds. This process generates valuable gaseous (pyrolysis gas) and solid (residual ash) fractions, serving as an effective approach for sludge treatment that achieves reduction, stabilization, harmless disposal, and resource recovery.
Energy-saving and Environmental Advantages of Sludge Pyrolysis:
Suppression or Decomposition of Dioxins:
The pyrolysis process occurs under a reducing atmosphere, effectively inhibiting dioxin synthesis. After purification (dust removal, acid removal), the pyrolysis gas contains no catalytic substances (metals or their oxides). In the high-temperature combustion process within the dioxin
combustion in the combustion chamber/RTO is a thorough and clean oxidation process. Under specific conditions, dioxins present in the material can be effectively decomposed during pyrolysis.
Reduced flue gas volume:
Pyrolysis gas volume is only 1/2 to 1/3 of solid waste combustion emissions, minimizing the scale and operating costs of flue gas purification equipment.
High energy utilization with minimal losses:
Sludge requires no drying; pyrolysis gas directly dries materials within the furnace. Combustion in the afterburner chamber generates high-temperature flue gas for steam production in the waste heat boiler. Compared to incineration, pyrolysis produces significantly less exhaust gas, resulting in substantially lower energy loss.
Reduced atmospheric pollutant emissions:
Emissions of particulate matter, SO₂, NOx, heavy metals, and other pollutants from pyrolysis gas combustion are more than 50% lower than those from direct solid waste incineration.
Three Stages of Sludge Pyrolysis:
DRYING
100°C~250°C. Rising hot flue gas and descending sludge undergo convective heat transfer within the furnace bed, causing moisture within the sludge to evaporate.
THERMOLYSIS
250°C–750°C. As sludge temperature rises, complex chemical reactions occur, releasing significant volatiles. Continued heating allows deeper volatiles to diffuse outward, while residual carbon weight decreases and stabilizes. Strict control of furnace layer temperatures and ventilation (O₂) ensures reductive pyrolysis-gasification reactions.
COOLING
400°C–300°C. Ash and residual carbon from pyrolysis cool within the furnace layer.
Advantages of Multi-Stage Furnace Sludge Pyrolysis Mode:
• Enables self-sustaining thermal equilibrium operation at high moisture content with low energy consumption;
• Allows easy zoned control of furnace temperature and atmosphere;
• Separation of solid and gaseous products enables optimal reactions for each phase;
• Minimal moving parts and low power requirements;
• Superior airtightness facilitates straightforward oxygen control;
• Enhanced flexibility in operating condition control (residence time);
• Robust construction ensures extended furnace lifespan;
• Minimal granular discharge;
• Easily scalable for large-scale applications.
Sludge pyrolysis process flow diagram 1 (municipal sludge)
Sludge pyrolysis process flow diagram 2 (hazardous waste sludge)
Sludge Pyrolysis Technology
Keywords: Sludge Pyrolysis Technology
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Nanjing Yuding Environmental Technology Co., Ltd. is a wholly-owned subsidiary of Jiangsu Huanan Petrochemical Engineering Group Co., Ltd., dedicated to the research, development, design, manufacturing, installation, and operation of environmental protection technologies and equipment.
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