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. Tests have shown that the destruction rate of organic carbon exceeds 99.97% when organic wastewater with organic carbon content between 27000 and 33000mg / L is treated by supercritical water oxidation, and all organic matter is converted into carbon dioxide and inorganic matter. [0003] E...

AI Technical Summary

Problems solved by technology

[0003] Existing supercritical water treatment methods, such as the invention patent with publication number CN101580320A, are controlled manually, with low degree of automation, and the safety and reliability of the control system are not good. High, the system performance is unstable, and requires a large number of operators, the downtime rate is relatively high, no matter the reason for the downtime is error / fault or maintenance, the longer the production downtime, the higher the cost of downtime, so it is necessary to use supercritical water Improvement of the processing unit to reduce its downtime by using a fault-tolerant system

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

Images