Detailed introduction
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Sludge incineration:
Under oxygen-rich and certain temperature conditions, H₂O in sludge evaporates, and organic matter reacts with O₂ to produce gaseous and solid-phase residues such as H₂O and CO₂. This is a major process used for the volume reduction and disposal of sludge.
Sludge Pyrolysis:
By leveraging the thermal instability of organic matter in sludge, heating it under anaerobic conditions induces thermal cracking of the organic compounds, yielding a gas phase (pyrolysis gas) and a solid phase (solid residue) with higher utilization value. This approach represents an effective method for reducing the volume, stabilizing, rendering harmless, and recovering resources from sludge disposal.
Energy-saving and environmentally friendly advantages of sludge pyrolysis:
● Inhibit or decompose dioxins:
The pyrolysis process is carried out under a reducing atmosphere, which can effectively inhibit the formation of dioxins. The pyrolysis gas, after purification (dust removal and acid removal), contains no catalytically active substances (such as metals or their oxides). Consequently, the high-temperature combustion process in the secondary combustion chamber/RTO is a thorough and clean oxidation process. Under specific conditions, the pyrolysis process can effectively decompose dioxins present in the feedstock.
●Low flue gas emissions:
The amount of flue gas generated from pyrolysis gas is only 1/2 to 1/3 of that produced by the combustion of solid waste, thereby reducing the size and operating costs of flue gas purification equipment.
● High energy utilization rate and low losses:
The sludge does not need to be dried; the pyrolysis gas generated from pyrolysis is directly used for in-furnace drying. The high-temperature flue gas produced by combustion in the afterburner is then fed into a waste heat boiler to generate steam. Compared with incineration, the pyrolysis process produces a smaller volume of exhaust gas, resulting in significantly less energy carried away by the tail gas.
● Low emissions of atmospheric pollutants:
The emissions of particulate matter, SO2, NOx, heavy metals, and other pollutants from the combustion of pyrolysis gas produced from sludge are more than half lower than those from the direct combustion of solid waste.
Three stages of sludge pyrolysis:
Drying: 100℃ to 250℃. Rising hot flue gases and descending sludge undergo convective heat transfer within the furnace layer, causing the moisture in the sludge to evaporate.
Thermal Pyrolysis: 250℃ to 750℃. As the sludge temperature rises, complex chemical reactions occur within the sludge, leading to the release of large amounts of volatile substances. As the temperature continues to increase, deeper-lying volatile components continue to diffuse toward the outer layers, causing the residual char weight to decrease and eventually stabilize. It is crucial to strictly control the temperature and oxygen (O2) supply in each furnace layer to ensure that a reductive pyrolysis-gasification reaction is effectively achieved.
Cooling: 400℃ to 300℃. The ash and residual carbon after pyrolysis cool down within the furnace bed.
Introduction to Main Types of Sludge Pyrolysis Furnaces
Process characteristics of three types of industrial furnaces
multiple hearth furnace Rotary kiln Fluidized bed Slow Pyrolysis Slow Pyrolysis Rapid pyrolysis The drying and pyrolysis processes occur in stages. The drying and pyrolysis processes occur in stages. The drying and pyrolysis processes occur simultaneously. Temperature and atmosphere can be easily controlled in layers. Temperature and atmosphere can only be controlled in vague segments. Temperature and atmosphere are difficult to distinguish and control. Oxygen control is simple. Oxygen control is simple. Oxygen control operations are relatively difficult. Capable of achieving high-water-content self-heating equilibrium operation. Capable of achieving high-water-content self-heating equilibrium operation. Difficult to achieve high-water self-thermal equilibrium operation. Low fly ash volume Low fly ash volume High fly ash content The syngas outlet temperature is low. The syngas outlet temperature is low. The syngas outlet temperature is high. Low power demand High power demand High power demand The furnace structure is complex. The furnace structure is simple. The furnace structure is simple. Small footprint Large land area Small footprint Advantages of the multiple hearth furnace sludge pyrolysis process:
◎ Enables high-water-content self-heating equilibrium operation with low energy consumption;
◎ The furnace temperature and atmosphere can be easily controlled in layers;
◎ Separate solid products from gaseous products to allow each to undergo the optimal reaction;
◎ Few moving parts, low power demand;
◎ Excellent airtightness and simple oxygen control operation;
◎ More flexible control of operating conditions (residence time);
◎ Durable and long-lasting; furnace body has a long service life.
◎ Low particulate emissions;
◎ Easy to scale up.
Sludge pyrolysis
Keywords: Sludge pyrolysis
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