Device and method for oxidizing sludge by using supercritical water

Abstract

The invention discloses a device and a method for oxidizing sludge by using supercritical water. The device comprises a reactor body for supercritical sludge oxidation reaction, a discharge pipe connected to the bottom end of the reactor, a valve arranged on the discharge pipe and a deslagging funnel connected to the bottom end of the discharge pipe. A scraping driving device for preventing precipitated salt in the reactor body from being precipitated and blocked at the bottom end in the reactor body is arranged at the bottom end of the reactor body and is positioned between the reactor body and the discharge pipe. When liquid flowing in the reactor body contains salt, a plurality of first telescopic rods of the device are driven to be connected with telescopic soft strips to move along the interior of the reactor body for scraping so as to prevent crystalline salt from being precipitated at the bottom end of the interior of the reactor body. Meanwhile, during discharging, the device is driven to rotate again through flowing of the fluid, the device moves up and down at the position of the discharge pipe to achieve an anti-blocking effect on the discharge pipe, and therefore precipitated salt is prevented from blocking a feeding port.

Description

technical field [0001] The invention relates to the technical field of supercritical water oxidation, in particular to a device and a method for utilizing supercritical water to oxidize sludge. Background technique [0002] The treatment of sludge, especially urban municipal sludge, is an important environmental issue. At present, landfill and incineration are used for disposal. However, landfill treatment will occupy a certain amount of landfill space, and may pollute groundwater bodies due to the presence of heavy metals and possible harmful microorganisms in the sludge. Incineration technology is currently a treatment technology for organic matter commonly used at home and abroad, but high-temperature combustion is likely to produce toxic substances such as dioxins and nitrogen oxides, causing secondary pollution. In addition, for sludge treatment with high water content, the input and operating costs of incineration facilities are high; [0003] SCWO (Supercritical Wa...

AI Technical Summary

Problems solved by technology

[0005] The precipitated salt will enter the reactor even under the condition of high flow rate, and with the change of the reaction parameters, a large amount of salt will eventually be precipitated in the reactor, resulting in precipitation in the reactor, and even at a certain pressure and density Under certain conditions, some salts will dissolve, however, the separation of bases will occur, leading to internal corrosion of the reactor.

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