Tubular evaporation wall reactor used for supercritical water oxidation treatment

Abstract

The invention discloses a tubular evaporation wall reactor used for supercritical water oxidation treatment. According to the reactor provided by the invention, evaporation wall structure reactors areconnected, each evaporation wall section independently adjust a water volume to form an excellent protective water film, segmentation oxygen implantation is adopted to avoid local overheating of thereactor, temperature partition zones are arranged in the reactor to dissolve precipitated inorganic salts while ensuring high-efficiency organic matter degradation, reactor corrosion and salt deposition blocking are avoided while treatment capacity amplification of the reactor is solved, a pressure bearing function and a corrosion resistant function are separated, the manufacturing costs are reduced, and the system economy is improved; and meanwhile, safe and stable operation of the reactor is guaranteed through a perfect temperature and pressure monitoring system, and the technology is more suitable for industrial large-scale applications.

Description

technical field [0001] The invention relates to the fields of environmental protection and chemical industry, in particular to a tubular evaporation wall reactor used in supercritical water oxidation treatment of high-concentration refractory biochemically degradable waste. Background technique [0002] Supercritical water oxidation technology uses the special properties of water in the supercritical state to completely dissolve oxidants and organic substances in supercritical water and undergo a homogeneous oxidation reaction to rapidly and thoroughly convert organic substances into harmless CO. 2 , N 2 、H 2 O and other small molecular compounds, chlorine is converted into metal salts of chloride ions, nitro is converted into nitrogen, sulfur is converted into sulfate, and phosphorus is converted into phosphate. The use of SCWO to treat hazardous waste liquids has high oxidation efficiency, and the removal rate of organic matter can reach more than 99.9%; the reaction spa...

AI Technical Summary

Problems solved by technology

Under such harsh reaction conditions, the prominent problems faced by supercritical water oxidation reactors are heat release control, material corrosion and salt deposition clogging, etc.

Treating materials with high organic content is a necessary condition for supercritical water oxidation technology to maintain self-heating reaction, while the oxidation reaction of high-concentration organic matter will exotherm violently, resulting in local high temperature. Excessively high temperature will reduce the pressure bearing capacity of the material and lead to high temperature corrosion

High oxygen and high salt concentrations (such as halide ions or phosphate ions) in high-temperature and high-pressure environments will cause severe corrosion of service materials, and passively improving corrosion resistance by improving the corrosion resistance of materials will lead to high manufacturing costs

Under the condition of supercritical water, the solubility of inorganic salts is extremely low, and the precipitated inorganic salts will also block the reactor, resulting in overpressure of the system and causing safety accidents or shutdowns

Local high temperature, material corrosion and salt deposition blockage will seriously affect the safe and stable operation of the reactor

At present, supercritical water oxidation reactors mainly adopt two forms: tank reactor and tubular reactor. The two reactors have their own characteristics: the tubular reactor is easy to manufacture and beneficial to industrial scale-up, but the single structure is not conducive to the installation of anti-corrosion and anti-corrosion. Salt deposition structure, suitable for large-scale industrialization and weakly corrosive and low-salt materials; tank reactor manufacturing is relatively complicated, and industrial scale-up is limited, but it is beneficial to set up special structures for anti-corrosion and anti-salt deposition, suitable for small-scale and corrosive materials strong material

In practical applications, materials with large processing capacity, high organic concentration and high salt content are common, and large processing capacity is the key to achieving the scale effect of this technology and improving the economy. At this time, the design and selection of the reactor will be facing difficulty

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