Pressure control system and method for supercritical water oxidation treatment system

Abstract

The invention discloses a pressure control method for a supercritical water oxidation treatment system. A control system comprises a starting and stopping branch circuit, a pressure regulation branchcircuit, a standby pressure regulation branch circuit, a washing branch circuit, an accident branch circuit and a resistance water branch circuit. Stable raising and reduction of pressure of normal starting and stopping phases of the system are realized through the starting and stopping branch circuit; the pressure drop of the system of a normal operation phase is realized through the pressure regulation branch circuit and the standby pressure regulation branch circuit; accurate control of the pressure of the system at the normal operation phase is realized through the resistance water branchcircuit; rapid and safe pressure drop of the pressure of the system is realized through the accident branch circuit when the pressure of the system is rapidly increased; washing operation of the system is realized through the washing branch circuit after stopping. In the pressure regulation branch circuit, the pressure drop of the system is realized through on-way resistance of fluid passing through a capillarity tube; the problems of abrasion, blocking, noises and the like in a pressure reduction process can be effectively avoided, so that stable and safe control of the pressure of the systemis ensured.

Description

technical field [0001] The invention belongs to the fields of environmental protection and chemical industry, and relates to a pressure control system and method for a supercritical water oxidation treatment system. Background technique [0002] Supercritical water (Supercritical Water, SCW) refers to water whose temperature and pressure are above its critical point (374.1°C, 22.1MPa). Compared with ordinary liquid water, various physical and chemical properties of supercritical water have undergone significant changes: the hydrogen bonds between water molecules are weakened; the density, viscosity, and ion product are significantly reduced, and the diffusion coefficient is higher; the dielectric constant becomes It is extremely small, dropping from about 80 at room temperature to 2-30 in the supercritical state, roughly equivalent to the dielectric constant of general organic solvents in the standard state. Therefore, the solubility of supercritical water to inorganic salt...

AI Technical Summary

Problems solved by technology

However, there are still deficiencies. The multi-stage depressurization technology only solves the problems of cavitation and noise of the high-pressure differential fluid, but cannot solve the problems of erosion and sticking of the valve by the particle fluid.

The high-speed flowing particle fluid will have a strong erosion of the valve trim, resulting in serious wear

When the granular fluid flows through the small flow channel, it is easy to cause problems such as blockage and stagnation, which will eventually lead to system failure

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