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 comprises an injector, a vertical reaction kettle, an isolation sleeve with cooling and isolation effects, an external heating device, a salt discharge valve, a salt discharge kettle, a salt discharge kettle vent valve, a stop valve, a discharge spray pipe, a temperature sensor and a pressure sensor. Reactants are atomized and mixed in advance through an injector, and a heat management structure adopts a cold and hot separation mode; the structural layout that a built-in sleeve, a feed port and a discharge port are arranged at the top is utilized; the service life of the blow-off valve is effectively prolonged by using a pressure control mode of small-flow continuous discharge and large-flow intermittent discharge; the use efficiency of the reaction device is improved by adopting a parallel control mode of a plurality of discharge valves and a working mode of a salt discharge kettle and a corresponding control valve thereof; in practical application, long-term unmanned operation and online maintenance and detection under partial fault conditions can be realized, the operation efficiency of the device is greatly improved, and the waste liquid treatment period and cost are effectively reduced.

Description

technical field [0001] The invention is used for conventional organic waste liquid or nuclear-related organic waste liquid treatment, and belongs to the technical field of environmental protection equipment, in particular to a device structure for supercritical water oxidation reaction and a control method for supercritical water oxidation reaction. Background technique [0002] With the development of the national industrial system and the improvement of environmental protection requirements, the existing waste liquid treatment methods such as incineration, extraction, and adsorption have been difficult to meet the discharge requirements. [0003] Since supercritical water (temperature ≥ 373.99 ° C, pressure ≥ 22.064 MPa) has the ability to dissolve non-polar organic compounds, it is completely miscible with organic matter, oxygen, air, etc. under sufficiently high temperature and pressure, so these organic compounds can be Homogeneous oxidation in supercritical water, not ...

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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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