Supercritical water processing control system and control method thereof

Abstract

The invention relates to a supercritical water processing control system and a control method thereof. The supercritical water processing control system provided by the invention comprises a control unit, an analog signal acquisition unit, a digital signal acquisition unit and a field execution device, wherein the control unit is the control core of the system; the input end of the control unit is accessed to the field signals of the analog signal acquisition unit and the digital signal acquisition unit; the output end of the control unit is connected with the field execution device; the control unit is singly operated and automatically switched through the form configuration of redundancy pairs; and the control unit is in communication connection with an upper machine through Ethernet. The method provided by the invention comprises the starting course and stopping course of the supercritical water processing control system, the overvoltage protection course at the top of a reactor and the over-temperature protection course of the bearing wall of a mixer, the top cover of the reactor and a bearing barrel body. In the invention, the automation control degree is enhanced; the manual labor intensity and the number of personnel are greatly reduced; the operating cost is further lowered; and a digital signal processing technique is applied in software, thus the supercritical water processing control system has the advantages of excellent disturbance resistance and zero stability.

Description

technical field [0001] The invention relates to the technical field of supercritical water treatment equipment, in particular to a supercritical water treatment control system and a control method thereof. Background technique [0002] Supercritical water means that water is in a supercritical state when the temperature and pressure exceed the critical state temperature of 374°C and critical pressure of 22MPa respectively. Since supercritical water is an excellent solvent for both organic matter and oxygen, the critical water oxidation method can be used in the treatment of various toxic and harmful wastewater and waste, and can have a high removal rate for most refractory organic matter. Experiments have shown that the organic carbon content of organic wastewater between 27000-33000mg / L is treated by supercritical water oxidation, and the destruction rate of organic carbon exceeds 99.97%, and all organic matter is converted into carbon dioxide and inorganic matter. [0003...

AI Technical Summary

Problems solved by technology

[0003] The existing supercritical water treatment device is manually controlled, with low degree of automation, low security and reliability of the control system, unstable system performance, and requires a large number of operators. The shutdown rate is relatively high, regardless of the reason for the shutdown. Errors / faults or maintenance, the longer the production downtime, the higher the cost of downtime, so it is necessary to improve the supercritical water treatment plant and use a fault-tolerant system to reduce its downtime

However, the control system with fault-tolerant function that can implement automatic control of supercritical water treatment equipment has not been reported yet.

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