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A Method and System for Steady and Rapid Atmosphere Switching and Their Application

A fast switching and gas flow switching technology, which is applied in the field of fluid control technology and chemical analysis, can solve the problem that the reversing valve system cannot replace the atmosphere in the microreactor smoothly and quickly, which affects the reliability, repeatability and accuracy of the analysis process, etc. problem, to achieve the effect of rapid replacement, promotion of development, and avoidance of dead volume

Active Publication Date: 2018-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Based on the above research, the present invention proposes a stable and fast atmosphere switching method to solve the problem that the existing reversing valve system cannot replace the atmosphere in the microreactor smoothly and quickly, thereby affecting the reliability, repeatability and accuracy of the analysis process. The method and system and its application

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  • A Method and System for Steady and Rapid Atmosphere Switching and Their Application

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specific Embodiment approach 1

[0016] Specific implementation plan one: combine figure 1 Describe this embodiment. This embodiment provides a method and system for switching atmospheres smoothly and quickly. The airflows A and B are connected to the outlet airflow and exhaust airflow through simple pipelines and the airflow reversing unit 1 composed of one or more two-position direct-acting solenoid valves; the two inlet airflows A and B flow continuously and stably Inlet airflow reversing unit 1, airflow reversing unit 1 switches two inlet airflows (A, B), respectively forms outlet airflow and exhaust airflow according to timing settings, and realizes fast switching of airflow; uses pressure transmitter to detect two inlet airflows Use the inlet pressure controller to adjust the back pressure of the exhaust air flow, so that the pressure states of the two intake air streams A and B are the same, so that during the air flow switching process, the two intake air streams A, B The pressure and flow of B are s...

specific Embodiment approach 2

[0019] Specific implementation plan two: combine figure 1 This embodiment will be described. In this embodiment, the effective diameter of the flow channel in the switching system is 1 mm to 4 mm. Such setting reasonably increases the airflow velocity and makes the flow in the tube more similar to plug flow, so the residual airflow in the tube after switching can be slowed down, thereby speeding up the speed of atmosphere switching, and it is easy to manufacture and use. The other components and connections of this embodiment are the same as those in the first embodiment.

specific Embodiment approach 3

[0020] Specific implementation plan three: combination figure 1 Describe this embodiment. In this embodiment, the differential pressure value of the pressure transmitter 3 is stabilized at -100Pa to 100Pa. Negative feedback is automatically adjusted to achieve. With this setting, the pressure difference between the intake airflow (A, B) is intelligently controlled to be close to zero; the disturbance range of the pipeline state parameters such as pressure and flow at the moment of switching is minimized, so that the atmosphere quickly stabilizes to the target state after switching, so that The reliability, repeatability and accuracy of atmosphere switching are greatly improved; and it is easy to operate and use. The other components and connections of this embodiment are the same as those of Embodiment 1 or Embodiment 2.

[0021] Specific implementation plan four: combination figure 1 and figure 2 To illustrate this embodiment, the airflow reversing unit of this embodimen...

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Abstract

A method and system for switching atmosphere smoothly and quickly and its application, which can solve the problem that the existing reversing valve system cannot replace the atmosphere in the microreactor smoothly and quickly, thereby affecting the reliability, repeatability and accuracy of the analysis process . The airflow reversing unit of the present invention quickly switches the intake airflow flowing to the downstream; the inlet pressure controller and the pressure transmitter jointly control the pressure difference between the intake airflows to be close to zero, so that the switching process is smooth and fast. The invention can realize the smooth and rapid switching of the component concentration of the downstream airflow in a manner close to the ideal rectangular wave. The invention can be applied to analyze the multi-stage in-situ reaction process of solid particles based on atmosphere switching; and quantitatively characterize the diffusion and back-mixing of the gas flow in the microreactor.

Description

technical field [0001] The invention relates to a method and system for switching gas flow components and their applications, in particular to a method and system for switching atmospheres smoothly and quickly and their applications, and belongs to the fields of fluid control technology and chemical analysis technology. Background technique [0002] Instrument systems, chemical reaction analysis devices, and high-temperature reaction experimental devices often involve rapid changes in atmosphere (composition and concentration of gases) or replacement of residual gas in container pipelines. In the prior art, a single or a simple combination of manual and automatic reversing valves is often used to realize the reversing of the gas flow, thereby changing the atmosphere or displacing the residual gas in the pipeline of the container. These conventional methods cannot meet the performance requirements of rapid (≤1s), complete (residual amount ≤ 1‰ of concentration switching amoun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/04G01N27/62B01J19/00
CPCB01J19/0093G05B19/04G01N27/62
Inventor 孙绍增郭洋洲严泰森赵虹翔孟顺冯冬冬赵义军
Owner HARBIN INST OF TECH
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