Sludge super-critical water oxidation system with heat-conducting oil used as heat exchanging medium and sludge treatment method

Abstract

The invention discloses a sludge super-critical water oxidation system with heat-conducting oil used as a heat exchanging medium and a sludge treatment method. Sludge is introduced into a sludge pyrohydrolysis pot, and then is transferred to a heat exchanger through a material pump for heating, the sludge and oxygen are mixed, in a reactor, super-critical water oxidation reaction is carried out, and a lot of heat is released. Reacted high-temperature fluid passes the heat exchanger at first, and then passes a heat-conducting oil heat exchanger to pass the heat to heat-conducting oil. The heat-conducting oil enters an outer wall coil of the sludge pyrohydrolysis pot to heat the sludge pyrohydrolysis pot, so that pyrohydrolysis reaction is ensured. Through the heat-conducting oil heat exchanger, the heat, which is released by the super-critical water oxidation reaction, of a high-pressure highly-corrosive heat source is converted into a constant-pressure non-corrosive heat source by means of the heat-conducting oil used as the heat exchanging medium, the system safety, economical efficiency and reliability are improved comprehensively, the super-critical water oxidation reaction is completed, and up-to-standard discharge is achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and specifically relates to a sludge supercritical water oxidation system and a sludge treatment method using heat transfer oil as a heat exchange medium. Background technique [0002] Supercritical water refers to water in a special state where the temperature and pressure exceed the critical point of water (374°C, 22.1MPa). As the phase state of water enters the supercritical state, the density and ion product constant of water decrease significantly, and the viscosity significantly decreases. The decline leads to increased liquidity. At the same time, supercritical water tends to be a non-polar fluid, and can almost completely dissolve organic matter and gas. [0003] Supercritical water oxidation (supercritical water oxidation) technology takes advantage of many advantages of supercritical water, and uses supercritical water as a medium for the oxidatio...

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Problems solved by technology

[0012] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a sludge supercritical water oxidation system and a sludge treatment method using heat transfer oil as the heat exchange medium. The problem of sludge scaling and coking on the surface of the inner coil pipe in the sludge thermal hydrolysis tank, improving the stability and reliability of the system

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