A supercritical water oxidation reaction device and control method

Abstract

The invention relates to a vertical supercritical water oxidation reaction device and a control method. The device includes an injector, a vertical reaction kettle, an isolation sleeve with cooling and isolation functions, an external heating device, a salt discharge valve, a salt discharge kettle, Brine discharge valve, stop valve, discharge nozzle, temperature sensor and pressure sensor. The reactants are atomized and mixed in advance through the injector, and the heat management structure adopts the cold and hot separation mode; the structural layout of the built-in sleeve and the top of the inlet and outlet is used; the continuous discharge of small flow and intermittent discharge of large flow are used. The pressure control method effectively prolongs the service life of the discharge valve; the parallel control of multiple discharge valves is adopted, and the working method of the salt discharge kettle and its corresponding control valve is adopted to improve the use efficiency of the reaction device; in practical applications, long-term Unmanned operation and online maintenance and detection under some fault conditions greatly improve the operation efficiency of the device and effectively reduce the waste liquid treatment cycle and cost.

Description

A kind of supercritical water oxidation reaction device and control method technical field The present invention is used for the treatment of conventional organic waste liquid or nuclear-related organic waste liquid, belongs to the technical field of environmental protection equipment, especially A device structure for supercritical water oxidation reaction and a control method for supercritical water oxidation reaction. Background technique Along with the improvement of national industrial system development and environmental protection requirements, existing waste liquid treatment such as incineration, extraction, adsorption, etc. It has been difficult to meet the emission requirements by the management method. [0003] Because supercritical water (temperature ≥ 373.99 ° C, pressure ≥ 22.064MPa) has the ability to dissolve non-polar organic compounds The ability of it is completely miscible with organic matter, oxygen, air, etc. under high enough temperature and pres...

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Problems solved by technology

[0004] In the existing supercritical water oxidation reaction device and control method, due to the limitation of the structure of the reactor, the heating device and the cooling device are located outside the reactor shell. The cooling and heating efficiency is extremely low, which is not conducive to the rapid control of the reactor temperature, but also increases the cost of waste liquid treatment

When the waste liquid is passed into the reactor, the existing device adopts a separate independent pipeline for direct feeding, which is not conducive to the atomization and mixing of the reactants, and prolongs the reaction preparation time; because there is no special structure inside and effective control measures , the ability to resist discharge pressure fluctuations is poor, and it is easy to cause the reactants and reaction products to be excluded from the device at the same time, resulting in low processing efficiency

And the control of each parameter requires close human participation, and the degree of equipment automation control is low

On the other hand, because most of the existing reaction devices adopt intermittent discharge control, the valves work frequently, with short service life and poor reliability.

When the reaction device fails, the reaction device must be shut down for troubleshooting, which affects the ability of the reaction device to process waste liquid, resulting in high operation and maintenance costs for the treatment system, which is not conducive to the realization of industrialization and industrialization

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