A sludge supercritical water oxidation system and sludge treatment method using heat transfer oil as heat exchange medium

Abstract

Disclosed in the present invention are a sludge supercritical water oxidation system using heat-conducting oil as a heat exchange medium and a sludge treatment method. Sludge is introduced into a sludge pyrohydrolysis tank, then conveyed to a heat exchanger by means of a material pump for heating and mixed with oxygen to undergo a supercritical water oxidation reaction in a reactor to release a lot of heat. The high-temperature fluid obtained by the reaction first passes through the heat exchanger, and then passes through a heat-conducting oil heat exchanger to transfer the heat to heat-conducting oil. The heat-conducting oil enters an outer wall coil of the sludge pyrohydrolysis tank to heat the sludge pyrohydrolysis tank, so as to ensure the progress of pyrohydrolysis reaction. By means of the heat-conducting oil heat exchanger using the heat-conducting oil as a heat exchange medium for the heat released by the super-critical water oxidation reaction, the heat from a high-pressure strongly-corrosive heat source is converted to a normal-pressure non-corrosive heat source, and therefore, the safety, economy and reliability of the system are improved comprehensively, the super-critical water oxidation reaction is accomplished, 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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