System and treatment method for dealing with sudden power failure accidents of sludge supercritical water oxidation device

Abstract

The invention discloses a system and treatment method for dealing with sudden power failure accidents of a sludge supercritical water oxidation device. A high-level water tank and a pneumatic valve are arranged, when an emergency power failure accident happens, a high-pressure area of the supercritical water oxidation device is divided into a plurality of working sections through opening and closing of the pneumatic valve, and pressure relief operations are performed; and then, pipelines are forcedly flushed by utilizing stored water in the high-level water tank, so that the operations of sludge removal and cleaning in the supercritical water oxidation device are finished in a non-power-supply state, and the risk that equipment is irreversibly damaged due to the fact that the sludge is blocked in the supercritical water oxidation device and cannot be discharged due to sudden power failure accidents is effectively avoided. Meanwhile, the problem that the equipment investment is increased due to the arrangement of a high-power diesel generating set is solved, and the risk that the system unsafety is increased due to introduction of flammable and combustible diesel is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and specifically relates to a system and a treatment method for dealing with sudden power failures of a sludge supercritical water oxidation device. Background technique [0002] Under normal circumstances, water exists in three common states of steam, liquid water and ice. Liquid water is a polar solvent whose density hardly changes with the increase of pressure. It can dissolve most electrolytes including salts. And most organic matter is slightly soluble or insoluble. Supercritical water refers to water in a special state where the temperature and pressure are higher than its critical point (374.15°C, 22.1MPa). The properties of supercritical water will change greatly, and its density, dielectric constant, diffusion coefficient and thermal conductivity are different from ordinary water. Moreover, the solubility of organic substances and gases in supercr...

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Problems solved by technology

[0008] However, there is a fatal flaw in the above-mentioned scheme of sludge preheating and viscosity reduction: in the system, the sludge in the equipment pipeline between the sludge delivery pump and the reactor must ensure high temperature and low viscosity before being transported. Some failures lead to the shutdown of power equipment, such as sudden power failure, damage to the sludge delivery pump, etc., which will lead to the deposition of sludge in the equipment pipeline that has not completed the oxidation reaction in the equipment and pipeline. As time goes by, the sludge The temperature of the mud is getting lower and lower, and the viscosity is getting higher and higher

That is to say, once the sludge is deposited in the pipeline of the equipment, it can only be repaired by cutting a large number of pipelines. System cleared

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