Multi-layer structure micro-channel mixer and fluid mixing method thereof

Abstract

The invention relates to a multi-layer structure micro-channel mixer, which comprises a base plate and a sealing plate, wherein two sample injection liquid storage chambers, two inlet channels, two groups of fluid distribution channel nets, two groups of process fluid channels, a fluid collision mixing cavity, a fluid reinforced mixing channel and an outlet buffer chamber are arranged on the baseplate in a bilateral symmetry manner and are arranged on the two sides of the fluid collision mixing cavity. Two fluids to be mixed are respectively conveyed to two sample injection liquid storage chambers, respectively enter an inlet channel through the sample injection liquid storage chambers, enter a process fluid channel after being distributed through a multi-stage fluid distribution channel,and form two opposite impinging streams after flowing out of the process fluid channel,and after mixing, vortex or secondary flow is generated under the action that the fluid collides with a bafflingbaffle or an inner component in the mixing cavity, and finally the mixed fluid mixture flows out of the mixer through the outlet buffer chamber. The multi-layer structure micro-channel mixer has theadvantages of wide operation condition range, good mixing effect, high mass transfer coefficient, small pressure drop and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a microchannel mixer, which is a device and method for rapid and efficient mixing of homogeneous and immiscible solution-liquid two-phase and gas-liquid two-phase fluids. Background technique [0002] A microchannel mixer refers to a micromixing device (W.Enrfeld, V.Hessel, H.Lowe, Microreactors: New Technology for Modern Chemistry, Wiley VCH, Weinheim, Germany, 2000; Chemical Micro Process Engineering, V. Hessel, H. Lowe, Wiley VCH, Weinheim, Germany, 2004). This equipment is a key component in the synthesis system of Micro Reaction Flow Chemistry (Micro Reaction Flow Chemistry) to realize the mixing of fluid materials, and its performance directly determines the conversion rate, selectivity, yield, energy consumption and product quality of the chemical reaction. Because the Reynolds number of the fluid flow in the micro-scale channel is small, it is in a...

AI Technical Summary

Problems solved by technology

[0004] Among the passive micro-mixers, the common T-type or Y-type micro-mixers are simple in structure and easy to process, but the flow pattern is complex, and the mixing process depends on a specific flow pattern that can only be generated under very limited operating conditions, resulting in difficulty in process control , poor practicability (Jovanovic et al., Liquid–Liquid Flow in a Capillary Microreactor: Hydrodynamic Flow Patterns and Extraction Performance, Industrial & Engineering Chemistry Research, 2012,51,1015-1026; Kashid et al., Hydrodynamics of Liquid–Liquid Capillary Microreactor : Flow Regimes, Slug Size and PressureDrop, Chemical Engineering Journal, 2007, 131, 1-13; Zhao et al., Liquid-LiquidTwo-phase Mass Transfer in the T-junction Microchannels, AIChE Journal, 2007, 53, 3042-3053 )

Chinese patent CN101873890B, U.S. patent US7939033 and world patent WO2009 / 009129 all disclose a microchannel reactor with a "heart-shaped" structure, which can achieve better mixing effect and higher Mass transfer coefficient, but the pressure drop is too large, and the problem of stratification of immiscible two-phase fluids is prone to occur under the condition of bottom flow velocity (Wu et al., Hydrodynamic Study of Single-and Two-Phase Flow inan Advanced Flow Reactor, Industrial & Engineering Chemistry Research, 2015, 54, 7554-7564)

Stroock et al. (Chaotic Mixer for Microchannels, Science, 2002, 295, 647-651) proposed a staggered arrangement of herringbone micro-mixers, which generate transverse flow, thus generating chaotic convection and accelerating mixing. However, this mixer usually only obtains a better mixing effect under the condition of a large Reynolds number. In addition, there are disadvantages such as large pressure drop, high energy consumption, easy clogging, and inconvenient installation and cleaning.

Images