Sludge pyrolysis and gasification system

Abstract

The invention discloses a sludge pyrolysis and gasification system which comprises a screw feeder, a nozzle, a sludge heat drying chamber, a stirrer, a sludge pyrolysis and gasification chamber, a catalytic modification tower, a synthesis gas storage tank, a coke combustion chamber, a steam drum, a first cyclone separator, a second cyclone separator, a synthesis gas preheater, a superheater, an air preheater, an air blower and a water treatment workshop; sludge is fed into the nozzle rotating at a high speed through the screw feeder to be granulated and then sprayed into the sludge heat dryingchamber, and the sludge makes direct contact with superheated steam and heat circulating ash under the action of the stirrer for heat exchange; the dried sludge enters the sludge pyrolysis and gasification chamber to generate synthesis gas and coke; and the coke and a part of synthesis gas enter the coke combustion chamber to be combusted, and water is heated into saturated steam. The superheatedsteam and the heat circulating ash are used as drying media, sludge is subjected to heat drying in a multi-stage coupling heat exchange mode, so that the drying effect is improved, and meanwhile, sludge resource utilization is achieved through the sludge gasification-coke roasting gradient utilization technology.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and relates to a sludge pyrolysis gasification system. Background technique [0002] Sludge is a sediment produced in chemical, oil refining, papermaking, municipal and other sewage treatment processes. It is a solid-liquid mixture composed of bacterial micelles formed by various microorganisms and the organic and inorganic substances adsorbed by them. The moisture content of the sludge after mechanical dehydration is generally about 80%, and it also contains refractory organic matter, heavy metals and salts, as well as a small amount of pathogenic microorganisms and parasite eggs. If left untreated, it will cause serious damage to the environment. [0003] At present, the commonly used method in China is to heat-dry the sludge with a moisture content of about 80% after mechanical dehydration to reduce the moisture content of the sludge to about 50% before direct incineration. Generally...

AI Technical Summary

Problems solved by technology

In addition, sludge contains a large amount of nitrogen, and direct incineration treatment tends to produce higher concentrations of nitrogen oxides, and the organic components in sludge cannot be effectively recovered

Traditional dryers, such as the sludge fluidized bed drying device in CN201410437609.5, use a grinding bed, a return bed and a drying bed to dry the sludge, and it is necessary to add abrasives to prevent the sludge from drying and agglomerating ; The circulating fluidized bed integrated sludge incineration system in CN 110748894A adopts an incinerator and a drier to dry and incinerate the sludge. The above-mentioned drier mostly uses a fluidized bed drier, because the wet sludge has Higher viscosity may easily cause loss of fluidity and affect drying effect

Due to the indirect contact with the sludge of the paddle type dryer, the sludge drying effect is poor

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