System and method for continuously treating domestic sludge

Abstract

The invention discloses a system and a method for continuously treating domestic sludge. The system comprises a spiral drying and carbonizing furnace and a rotary-bed pyrolysis furnace. A domestic sludge inlet is formed in one end of a spiral drying and carbonizing furnace body, a carbonized sludge outlet is formed in the other end of the spiral drying and carbonizing furnace body, a feeding zone, a primary drying zone, a secondary drying zone, a carbonizing zone and a discharging zone are sequentially formed in the body along the direction from the domestic sludge inlet to the carbonized sludge outlet, the various drying zones are provided with combustors, water vapor outlets are formed in the various drying zones, a combustible gas outlet is formed in the carbonizing zone, and a flue gas outlet is formed in the discharging zone; a spiral conveyor of the spiral drying and carbonizing furnace is arranged in the body along the direction from the domestic sludge inlet to the carbonized sludge outlet; a carbonized sludge inlet, a pyrolysis oil and gas outlet and a solid residue outlet are formed in the rotary-bed pyrolysis furnace, and a radiant tube is arranged in the rotary-bed pyrolysis furnace. The system and the method have the advantages that the domestic sludge can be pre-dehydrated by the system, accordingly, the quality of pyrolysis oil and gas can be obviously improved, and the oil and gas separation cost can be reduced; equipment can stably continuously run, and accordingly the system and the method are high in heat efficiency and have obvious economic benefits.

Description

technical field [0001] The invention relates to the field of environmental energy, in particular, the invention relates to a system and method for continuously treating domestic sludge. Background technique [0002] Thermochemical conversion (such as carbonization, pyrolysis, gasification) of domestic sludge and other viscous carbonaceous materials (such as oilfield oily sludge, mineral dust sludge, industrial sludge, hazardous waste liquid) can produce solid, liquid and gaseous states These products are made into recyclable, easy-to-use, easy-to-transport and easy-to-storage energy forms according to needs, which can be used for thermal power generation or as raw materials for chemical and other industries. Depending on the raw material and the purpose of heat treatment, carbonization, gasification, pyrolysis, liquefaction or other related thermochemical reactions and processes can be used. [0003] Pyrolysis uses many reactor forms, such as moving bed, fixed bed, fluidize...

AI Technical Summary

Problems solved by technology

However, materials with high oil and water content, such as sludge and oil sludge, cannot be directly pyrolyzed by this method due to their viscosity.

[0008] The conventional fixed-bed pyrolysis system is fed in batches and cannot be operated continuously for a long time, and the pyrolysis conditions are not easy to maintain for a long time

[0009] Therefore, the existing means of treating domestic sludge still need to be improved

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