Spirally wound type quencher used for supercritical hydrothermal synthesis of nano powder

Abstract

The invention provides a spirally wound type quencher used for supercritical hydrothermal synthesis of nano powder. The spiral wound type quencher used for the supercritical hydrothermal synthesis ofthe nano powder comprises a cylinder, a plurality of layers of spirally wound heat exchange tubes are arranged in the cylinder, a spray pipe with a downward spray hole is arranged on the upper portionin the cylinder, the bottom end of each heat exchange tube communicates with a hot fluid inlet, the top end of each heat exchange tube communicates with a hot fluid outlet, the spray pipe is connected with a cooling water inlet, and the lower portion of the cylinder is provided with a cooling water outlet. Each layer of heat exchange tubes consists of a plurality of pipelines which are wound upwards or downwards in an inclined mode, the inclined directions of every two adjacent layers of heat exchange tubes are opposite, and spirals formed by winding are coaxial with the cylinder. Fins of a spiral structure can be arranged on the heat exchange tubes, a diversion collection box can be arranged at the bottom end of the cylinder, and a gathering collection box can be arranged at the top endof the cylinder. A spirally wound type heat exchanger structure is adopted, a spray structure is additionally arranged, heat exchange is enhanced, and the cooling efficiency of the quencher is improved. The heat exchange area is fully utilized, the occupied area of the quencher is greatly reduced, and the quenching requirement of the supercritical hydrothermal synthesis of the nano powder is met.

Description

Technical field [0001] The invention relates to a quench cooler used in the technical fields of energy, chemical industry and material technology, in particular to a spiral wound quench cooler used for supercritical hydrothermal synthesis of nano powder. Background technique [0002] Supercritical hydrothermal synthesis is an emerging technology for preparing nano-powder materials and has broad development prospects. Nano-powder materials have broad application prospects in magnetic materials, electronic materials, optical materials, high-density materials, etc., because they exhibit characteristics that conventional materials do not have in terms of light, electricity, and magnetism. The preparation of organic compounds has become an emerging field of research in the fields of chemical engineering and energy. The existing preparation methods of nanopowders are divided into two categories: physical methods and chemical methods. Among them, chemical methods are further divided in...

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Problems solved by technology

[0005] However, due to the extremely high reaction rate of supercritical hydrothermal synthesis technology, nano-powders are formed in a very short time. If the time under high temperature conditions increases, nano-powders will quickly aggregate into large particles, which will affect the production of nano-powders. Therefore, the supercritical hydrothermal synthesis technology often requires extremely short reaction time and rapid cooling and cooling, which puts forward strict requirements on the quenching device in the process system, so that the temperature of the reactant fluid can be rapidly reduced for a period of time. below the critical temperature for crystal growth

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