Controllable heating-heat regeneration device for preparing nano-powder by supercritical hydrothermal synthesis technology

Abstract

The invention discloses a controllable heating-heat regeneration device for preparing nano-powder by a supercritical hydrothermal synthesis technology. Cold and hot fluid inlet and outlet flow channels are formed in a shunt matrix; a cold fluid forward flow channel, a cold fluid reverse flow channel, a hot fluid forward flow channel and a hot fluid reverse flow channel are arranged in a heat exchange matrix, electric heating rods are arranged in a central layer, a cold fluid connecting cavity, an upper annular cavity A, an upper annular cavity B and an upper annular cavity C are formed in theupper part of the heat exchange matrix, a lower annular cavity A, a lower annular cavity B, a lower annular cavity C and a lower annular cavity D are formed in the lower part of the heat exchange matrix, the hot fluid inlet flow channel, the upper annular cavity A, the hot fluid forward flow channel, the lower annular cavity B, a heat communication flow channel, the lower annular cavity C, the hotfluid reverse flow channel, the upper annular cavity B and the hot fluid outlet flow channel form a hot fluid loop; and the cold fluid inlet flow channel, the upper annular cavity C, the cold fluid forward flow channel, the lower annular cavity D, a cold communication flow channel, the lower annular cavity A, the cold fluid reverse flow channel, the cold fluid connecting cavity and the cold fluidoutlet flow channel form a cold fluid loop. According to the invention, the preheating temperature can be accurately controlled, the floor space is reduced, and heater microchannelizationI is achieved.

Description

technical field [0001] The invention relates to a regenerator in the technical fields of energy, chemical industry, environmental protection, synthetic materials, etc., and in particular to a controllable heating-regenerator for preparing nano powder by supercritical hydrothermal synthesis technology. Background technique [0002] Supercritical Water (SCW for short) refers to water whose temperature and pressure are in a supercritical state (T>374.15°C, P>22.12MPa). At this time, the density of water expanded due to high temperature is the same as that of water vapor compressed due to high pressure, and there is no difference between liquid and gas of water. Strictly speaking, supercritical water is neither gas nor liquid, but a new type of high-pressure and high-temperature fluid with both properties. Supercritical water (SCW) changes the reaction rate and equilibrium by changing the dielectric constant and solvent density with pressure and temperature, thus providin...

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Problems solved by technology

[0004] There are some problems in the heaters and regenerators currently on the market: (1) The heating of the heaters is not sufficient. As the pressure and temperature of the feed water subjected to the supercritical hydrothermal synthesis system increase accordingly, tube bundle leakage and water pipe blockage often occur during operation. And problems such as poor heat transfer characteristics have a great impact on system load and economy

(2) The utilization rate of the heat exchange area of ​​the regenerator is low, and the cycle efficiency is poor, which makes the system unable to achieve rapid heating and efficient mixing

(3) The regenerator crystal product is prone to agglomeration due to its long residence time in the tube and the slow cooling of the high-temperature hot fluid, which will cause blockage and deposition of the regenerator and affect the stability of the entire system

At present, there are few highly integrated heater and regenerator devices on the market for supercritical hydrothermal synthesis technology, and the above problems are even more prominent for large-scale batch continuous production of nanoparticles

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