A membrane wall reactor for continuous thermal hydrolysis of sludge for supercritical water oxidation system

Abstract

The invention discloses a sludge continuous thermal hydrolysis membrane type wall reactor for a supercritical water oxidization system and belongs to the technical field of supercritical water oxidization. The sludge continuous thermal hydrolysis membrane type wall reactor comprises a barrel body, wherein an upper sealing head is arranged at the top of the barrel body and a lower sealing head is arranged at the bottom of the barrel body; a motor is mounted outside the upper sealing head; the barrel body is internally provided with a rotary shaft driven by the motor; the bottom of the rotary shaft is fixed on the lower sealing head; a sludge inlet is arranged on the upper sealing head and a sludge outlet is arranged at the bottom of the lower sealing head; the barrel body is internally further provided with a membrane type wall heat exchanger which is coaxial with the barrel body and is clung to a side wall of the barrel body; the rotary shaft is provided with a stirring device; the stirring device penetrates through a cavity of the membrane type wall heat exchanger; the upper sealing head is further provided with a hot fluid inlet and a hot fluid outlet; the hot fluid inlet and thehot fluid outlet are communicated with the membrane type wall heat exchanger. The sludge continuous thermal hydrolysis membrane type wall reactor is used for providing heat for sludge to raise the temperature of the sludge; thermal hydrolysis reaction occurs so that the viscosity is reduced; the technical problems in the aspects of sludge conveying, heat exchange and the like in the background technology are solved, so that the sludge continuous thermal hydrolysis membrane type wall reactor can be widely applied to the SCWO (Supercritical Water Oxidation) system for continuously treating thehigh-viscosity sludge.

Description

technical field [0001] The invention belongs to the technical field of supercritical water oxidation, and in particular relates to a continuous thermal hydrolysis membrane wall reactor for sludge used in a supercritical water oxidation system. Background technique [0002] Sludge is a by-product of municipal sewage treatment. With the increase of population and the improvement of urbanization level, the sewage treatment plant has been continuously expanded. Every 10,000 tons of sewage treated produces an average of 5.6 tons of wet sludge with a moisture content of 80%. In 2016, the sludge production has exceeded 40 million tons. The harmless rate of municipal sludge is still less than 25%, which has not reached the planned 80% rate of sludge treatment and disposal. Taking Beijing as an example, as of 2015, the rate of harmless sludge treatment in Beijing was only about 23%. At present, according to the planning requirements, by 2020, the sludge harmless treatment and dispo...

AI Technical Summary

Problems solved by technology

The SCWO sludge treatment system is in a long-term continuous operation state, and most of the current thermal hydrolysis processes are intermittent, which do not have the conditions for continuous operation, and cannot be effectively applied to the SCWO sludge treatment system

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