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Tube type device respondent to water heat in high temperature and pressure

A technology of high-temperature and high-pressure water and tubular reactors, applied in pressure vessels used in chemical processes, chemical instruments and methods, chemical/physical processes, etc., can solve the requirements that non-metallic anti-corrosion materials cannot obtain the required temperature, and wall heat conduction Coefficient reduction, low wall heat transfer coefficient, etc., to achieve the effect of ensuring safe and stable operation, saving heating energy, and increasing heat transfer area

Inactive Publication Date: 2005-01-19
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

As the main structural type of liquid-phase hydrothermal reactor, the tank reactor is the most used at present. The high-temperature and high-temperature autoclave reactor is limited by the following aspects when it is lined with anti-corrosion non-metallic materials: ①The heat transfer coefficient of the wall surface It is relatively low, which greatly prolongs the heating time and increases energy consumption; ②When the powder particles in the slurry have high adhesion to the wall, the thermal conductivity of the wall surface is further reduced; ③The sealing of the kettle body is difficult and the safety is reduced; ④Non-metallic anti-corrosion The material is limited by the creep temperature and cannot obtain the required temperature requirements, etc.
Therefore, for hydrothermal reactors with high temperature, high corrosion resistance, and high particle wall adhesion, it is unreasonable to design a kettle type

Method used

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  • Tube type device respondent to water heat in high temperature and pressure
  • Tube type device respondent to water heat in high temperature and pressure

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Effect test

Embodiment 1

[0017] When using the above-mentioned tubular high-temperature and high-pressure hydrothermal reaction device for hydrothermal reaction of high-purity and fine flame retardant magnesium hydroxide (chloride ions are contained in the slurry), the lining anti-corrosion material is polytetrafluoroethylene, which can well prevent chloride ions corrosion. The temperature in the tube was controlled at 200°C, the hydrothermal time was set at 4 hours, and the flow rate in the tube was 4m / s. As a result, the crystallization properties of the obtained magnesium hydroxide particles were greatly improved compared with those before the hydrothermal reaction, and the morphology was regular, Hexagonal flaky magnesium hydroxide product with uniform particle size distribution and high dispersion.

Embodiment 2

[0019] The hydrothermal reaction of basic magnesium sulfate whiskers is carried out by using the above-mentioned tubular high-temperature and high-pressure hydrothermal reaction device, and the reactor tube is lined with nickel alloy, which can effectively prevent the corrosion of hydroxide ions. The temperature inside the tube is controlled at 180-200°C, and the hydrothermal time is set at 6 hours, so that high-quality basic magnesium sulfate whiskers with needle-like morphology can be obtained.

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Abstract

A high-temp and-perssure hydrothermal tubular reactor for preparing powder material is composed of a main body of tuber reactor with forced circulation, high-temp circulating pump, heater, gas-liquid separator and valves. Its advantages are large heat-transfer area, high heat exchanging efficiency, small size, simple structure, and less chemical corrosion.

Description

technical field [0001] The invention relates to a high-temperature and high-pressure reaction device for hydrothermal preparation of powder materials, belonging to the technical field of powder material preparation. Background technique [0002] With the increasing demand for high-performance new functional powder materials in modern society, the development of powder material preparation technology has been promoted. As one of the powder material preparation technologies, the room temperature synthesis method has the advantages of easy control of components, simple equipment, and low production cost; however, the synthesized powder usually has irregular shape, poor crystallinity, easy agglomeration, and difficult solid-liquid separation , so that its application is limited. If the hydrothermal reaction and surface modification treatment are carried out on the basis of normal temperature synthesis, the performance of the normal temperature synthesis product can be significa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D43/00B01J3/04B01J8/08
Inventor 李志强魏飞向兰
Owner TSINGHUA UNIV
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