A supercritical reactor with internal gas product heat exchange

Abstract

The invention relates to a supercritical reactor capable of realizing gaseous product heat exchange inside. The supercritical reactor comprises a cylinder, an upper end closure, a deflection baffle, a heat exchange device and a spray burner, wherein the upper end closure is arranged at the upper end of the cylinder; the deflection baffle is arranged on the lower surface of the upper end closure; the heat exchange device is fixedly mounted at the lower part of the deflection baffle; the spray burner of the reactor penetrates through the heat exchange device to enter the cylinder; the heat exchange device comprises a sleeve and coil pipes; the sleeve comprises an innermost layer barrel, an outermost layer barrel and an intermediate layer barrel; the space between every two adjacent layer barrels is used for accommodating a layer of coil pipe; a gas phase outlet is formed in the upper end closure; a liquid phase inlet, a liquid phase outlet, a material inlet and a fuel inlet are formed in the upper end closure. According to the invention, heat exchange between supercritical vapor and low-temperature fluid in the coil pipes can be completed inside the reactor; the internal temperature of the reactor can be adjusted and controlled to reduce heat loss due to external heat exchange, which is beneficial to energy recovery; the supercritical vapor temperature after heat exchange is controlled to be about 300 DEG C, which brings convenience for follow-up processing.

Description

technical field [0001] The invention relates to high-temperature and high-pressure chemical equipment, in particular to a supercritical reactor for heat exchange of gas products inside. Background technique [0002] Supercritical water oxidation (SCWO) technology was first proposed by American scholar Modell in the mid-1980s as a deep oxidation technology that can completely and thoroughly destroy the structure of organic matter. In "Energy and Environment", one of the six major fields listed in the US National Key Technologies, it is pointed out that the most promising waste treatment technology is the SCWO method. [0003] Supercritical water (SCW) refers to water in a special state with a temperature exceeding 374.15°C and a pressure exceeding 22.12Mpa. Under this condition, the dielectric coefficient of water is greatly reduced, and oxidants and various organic substances form a homogeneous phase in the water system, eliminating mass transfer. Resistance, so that the he...

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Problems solved by technology

[0004] Due to the large amount of heat released during the supercritical water oxidation reaction, the temperature and pressure inside the reactor rise sharply. The superposition will cause serious corrosion damage to the inner wall of the equipment shell and internal parts

Therefore, reactor materials for supercritical water oxidation often need to withstand high temperature, high pressure, and corrosion, resulting in high production costs

[0005] In addition to the damage to the equipment, usually the gas products need to be exported to the outside of the reactor for cooling and then discharged. The heat exchange process is completed in the pipeline outside the reactor. The condition puts forward very high requirements on the material, sealing and strength of the pipeline, which in turn increases the manufacturing cost.

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