Device and method for controlling temperature and pressure of reactor of hypercritical water treatment system

Abstract

The invention discloses a device and method for controlling temperature and pressure of a reactor of a hypercritical water treatment system. The device comprises a control unit, a pressure transmitter, a back pressure valve and a heater, wherein the acquisition signal input end of the control unit is connected with the pressure transmitter in the reactor in a critical water treatment system, and the output end of the control unit is connected to a control loop of an electric actuator of the back pressure valve; and the back pressure valve is arranged on the top of the reactor. The method comprises the following steps of: initializing the device and setting the pressure control value of the reactor and the PID (Proportion Integration Differentiation) parameter of the back pressure valve; acquiring the pressure of the reactor through the pressure transmitter by using the control unit; judging whether the pressure of the reactor is higher than a set value or not; if the pressure of the reactor is not higher than the set value, performing PID operation and outputting a control signal by using the control unit and reducing the opening of the back pressure valve; and returning to the step for judging whether the pressure of the reactor is higher than the set value or not. By adopting the device and the method, reliability, stability, high accuracy and intelligentization are achieved, the requirements for industrial field application are met, and high anti-jamming capability and zero point stability are achieved.

Description

technical field [0001] The invention relates to the technical field of supercritical water treatment equipment, in particular to a supercritical water treatment system reactor pressure control device and a control method thereof. Background technique [0002] Supercritical water refers to water in a special state whose temperature and pressure are higher than its critical point (T=374.15°C, P=22.12MPa). Supercritical water treatment technology utilizes the special properties of supercritical water as a good solvent for both organic matter and oxidants. Under the premise of providing different amounts of oxidants, organic matter undergoes a homogeneous reaction in a supercritical water environment, rapidly, completely and thoroughly Deeply destroy the structure of organic matter and convert it into harmless CO 2 、H 2 (without adding or adding a small amount of oxidizing agent) and H 2 O and other harmless small molecule compounds. Supercritical water treatment technology ...

AI Technical Summary

Problems solved by technology

[0003] Supercritical water treatment technology requires harsh reaction conditions. The pressure is generally higher than 22MPa, generally stable at about 25MPa, and the temperature is generally higher than 450°C, which puts higher requirements on the normal and safe operation of supercritical water treatment reactors. The existing supercritical water treatment reactors set a safety valve to ensure the safety of the reactor under the condition of overpressure, and the automatic adjustment performance is poor, which affects the reliable and durable operation of the reactor

Images