A small supercritical water oxidation reaction system and its control method

Abstract

The invention relates to a small-size supercritical water oxidation reaction system which comprises a gas pressurization unit, a fuel pressurization unit, a material pressurization unit, a desalted water supply unit, a reactor unit and a gas-liquid separation unit, wherein the reactor unit comprises a reactor and a group of temperature sensors distributed in the reactor; the gas pressurization unit comprise an air pressurization unit; the fuel pressurization unit comprises a fuel tank, a fuel high-pressure pump and a fuel heater, which are connected through a fuel pipeline; the material pressurization unit comprises a material storage tank, a material high-pressure pump and a material heater, which are connected through a material pipeline; the desalted water supply unit comprises a desalted water storage tank, a group of metering pumps and a cooling water high-pressure pump; the metering pumps and the cooling water high-pressure pump are connected with the desalted water storage tank; and the gas-liquid separation unit comprises a liquid outlet pipeline and a gas-liquid separator. The invention further relates to a control method of the small-size supercritical water oxidation reaction system. The small-size supercritical water oxidation reaction system can be used for simulating a physicochemical reaction under severe conditions of supercritical water oxidation reaction to improve experimental environment.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to the use of supercritical water as a medium and oxygen or hydrogen peroxide as an oxidizing agent to perform harmless treatment and recycling of organic waste such as high-concentration salt-containing organic waste water / urban sludge / human waste that is difficult to biochemically degrade Utilization, in particular, a supercritical water oxidation small-scale reaction system and a control method thereof. Background technique [0002] Traditional sewage treatment technologies include: physical and chemical treatment technology, chemical treatment technology and biological treatment technology. Physicochemical method is often used as a pretreatment method for sewage treatment; chemical treatment technology is often used as a pretreatment method for biochemical treatment; the more commonly used treatment methods are basically biological methods, but the removal of refractory org...

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Problems solved by technology

However, due to the high cost of membrane products, short service life, susceptibility to pollution, secondary pollution caused by incomplete treatment, etc., this technology faces obstacles in the development process and difficult problems in popularization and application.

Generally speaking, the main problems in the current sewage treatment technology are: (1) Different types of treatment methods are required according to the types of wastewater and water quality characteristics; (2) The economic value of recovery in the process is not high, resulting in waste of resources and energy. Waste; (3) Sewage, especially some refractory organic wastewater, is very expensive to treat; (4) Incomplete treatment will cause secondary pollution

[0005] However, due to the harsh conditions of the supercritical water oxidation reaction at 374.15°C and 22.12Mpa, many processes are difficult to maintain stable operation, so in many processes, the wastewater and oxidant fluid are preheated to supercritical conditions and enter the reactor, so that in the preheating stage The problem of pipeline blockage and material corrosion caused by salt precipitation has greatly restricted the development of this technology

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