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Preparation device and method of low-concentration gas of certain humidity

A technology of gas preparation and low concentration, which is applied in the direction of mixing methods, chemical instruments and methods, gas and gas/steam mixing, etc. It can solve the problems of limited applicable gas types, complicated and cumbersome operation, and large gas consumption to achieve gas dilution ratio The effect of wide range, overcoming the influence of adsorption factors, and low concentration of gas distribution

Inactive Publication Date: 2009-02-04
ZHEJIANG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims at the current technical problems such as difficult preparation of low-concentration gas, unstable gas distribution, complex and cumbersome operation, large gas consumption, limited applicable gas types, difficulty in preparing gas with a certain humidity, etc., and provides a dynamic gas distribution method using diffusion and dilution. The preparation method and device of low-concentration gas containing a certain humidity have the characteristics of low cost, simple operation, small gas consumption, stable gas distribution and wide application

Method used

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  • Preparation device and method of low-concentration gas of certain humidity
  • Preparation device and method of low-concentration gas of certain humidity
  • Preparation device and method of low-concentration gas of certain humidity

Examples

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Embodiment 1

[0036] application figure 1 The device for preparing low-concentration toluene with a certain humidity:

[0037] The materials and parameters of each part of the low-concentration toluene preparation device in this example are as follows: 1- The carrier gas cylinder is an air cylinder; 21, 22- The range of the mass flow controller is 0-1.5L / min; 23- The mass flow controller 3- The length of the capillary tube is 5-8cm, and the inner diameter is 0.2-0.3mm; 4- The heating diffusion bottle is made of quartz material, and the volume is 200-250ml; 5- The heater is a multi-function constant temperature Water bath, the temperature range of water bath is 30~65℃; 6-capillary is made of stainless steel, polytetrafluoroethylene in the order of carrier gas control part, diffusion gas control part, dry air gas path part, humidity generating part and gas concentration mixing and stabilizing part. Made of ethylene, aluminum and PTFE, the capillaries of each gas path are connected by two-way...

Embodiment 2

[0044] To prepare a mixed gas of low concentration benzene and toluene with a certain humidity:

[0045] Use the attached figure 2 A gas preparation device system containing n kinds of components (n is between 1 and 10) with a certain humidity, the number of diffusion gas control parts in the device is 2, the volume of 2 heating diffusion bottles is 200-250ml; The length of the needle tube is 8~12cm, and the inner diameter is 0.2~0.3mm; the capillary tube is mixed according to the carrier gas control part, the diffusion gas control part benzene gas path, the diffusion gas control part toluene gas path, the dry air gas path, the humidity generating part and the gas concentration. The order of the stable part is made of PTFE, brass, stainless steel, stainless steel, PTFE and PTFE in sequence, and each section of capillary is connected by a two-way air-tight stainless steel joint, and the inner diameter of the stainless steel capillary is 0.4~0.8. mm, brass capillary 0.2-1.0 mm...

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Abstract

A preparation device of low-concentration gas with certain humidity consists of a capillary tube and a tee or two-way air-tight joint which are communicated with a carrier gas cylinder, a mass flow controller, a heating diffusion bottle, a humidity generating bottle and a gas mixing tank. The diffusion bottle is arranged in a heater, is communicated with the capillary tube by a capillary needle tube, and a diffusion gas control section is arranged with corresponding numbers and parameters according to the varieties and numbers of the prepared gas components. The gas mixing tank is provided with a hygrometer for real-time determination of the humidity of the prepared gas. The device of the invention adopts a diffusion-dilution type dynamic gas distribution method, can prepare the low-concentration gas with certain humidity, and is characterized by low cost, simple operation, low gas consumption, stable gas distribution, wide humidity regulation range, wide application, etc.

Description

technical field [0001] The invention belongs to the technical field of gas preparation, and relates to a preparation method and device for low-concentration gas, in particular to a preparation device and preparation method for realizing low-concentration gas with a certain humidity by utilizing the characteristics of volatilization or sublimation diffusion of substances. Background technique [0002] Low-concentration gases with a certain humidity are widely used in experimental research and product inspection. Low-concentration specific gas with a certain humidity can be used for the performance inspection of gas-sensitive materials, inspection and calibration of analytical instruments, etc., and low-concentration smoke can be used in the inspection of fire and toxic gas alarms. In addition, low-concentration gases can be widely used in environmental protection, national defense measurement and experimental research. In the process of gas-sensitive material development, lo...

Claims

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Application Information

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IPC IPC(8): B01F3/02B01F15/04B01F23/10
Inventor 赵伟荣鲍家泽董帆郭森
Owner ZHEJIANG UNIV
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