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Oxygen and nitrogen mixing type high-precision proportioning device and method

A high-precision, oxygen-nitrogen technology, applied in the direction of material thermal development, to achieve the effects of stable gas source, simple process and low maintenance cost

Inactive Publication Date: 2017-06-13
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no device and method in the prior art that can realize the high-precision ratio of nitrogen and oxygen and accurately determine the oxygen concentration.

Method used

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  • Oxygen and nitrogen mixing type high-precision proportioning device and method
  • Oxygen and nitrogen mixing type high-precision proportioning device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The oxygen and nitrogen mixing high-precision proportioning device includes an oxygen cylinder 1, a nitrogen cylinder 2, an oxygen mass flow controller 3, a nitrogen mass flow controller 4 and a proportioning bin 5; in the working state, the oxygen cylinder 1 outputs Oxygen, after the flow is adjusted by the oxygen mass flow controller 3, the oxygen is delivered to the proportioning chamber 5, and at the same time, the nitrogen cylinder 2 outputs nitrogen, and after the flow is adjusted by the nitrogen mass flow controller 4, the nitrogen Transported into the proportioning chamber 5, oxygen and nitrogen are output after being mixed and proportioned by the proportioning chamber 5.

[0032] An oxygen stabilizing valve 6, an oxygen stabilizing valve 8 and an oxygen gas resistance 10 are also equipped between the oxygen cylinder 1 and the oxygen mass flow controller 3, and the nitrogen cylinder 2 and the nitrogen mass flow controller 4 A nitrogen pressure stabilizing valve ...

Embodiment 2

[0042] The difference from Embodiment 1 is:

[0043] The cylindrical mesh has a length of 235 mm, a diameter of 30 mm, and a mesh diameter of 0.1 mm.

Embodiment 3

[0045] The difference from Embodiment 1 is:

[0046] The oxygen cylinder 1 and the nitrogen cylinder 2 are high-pressure gas cylinders, an oxygen pressure reducing valve 12 is also equipped between the oxygen cylinder 1 and the oxygen mass flow controller 3, and the nitrogen cylinder 2 and the nitrogen mass flow controller 3 A nitrogen pressure reducing valve 13 is also installed between the flow controllers 4 .

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Abstract

The invention provides an oxygen and nitrogen mixing type high-precision proportioning device. The oxygen and nitrogen mixing type high-precision proportioning device comprises an oxygen gas bottle, a nitrogen gas bottle, an oxygen gas mass and flow controller, a nitrogen gas mass and flow controller and a proportioning cabin; under a working state, oxygen gas is output by the oxygen gas bottle; after flow is adjusted by the oxygen gas mass and flow controller, the oxygen gas is conveyed into the proportioning cabin; meanwhile, nitrogen gas is output by the nitrogen gas bottle; after the flow is adjusted by the nitrogen gas mass and flow controller, the nitrogen gas is conveyed into the proportioning cabin; after the oxygen gas and the nitrogen gas are mixed and proportioned through the proportioning cabin, the mixed gas is output; the proportioning cabin comprises a cylindrical sealed pipe and is only provided with an input opening and an output opening which are used for inputting the oxygen gas and the nitrogen gas and outputting the mixed and proportioned gas; one section of cylindrical net is internally arranged, the length is 200mm to 240mm and the diameter is 28mm to 36mm; the diameter of net meshes is 0.03mm to 0.12mm. The oxygen and nitrogen mixing type high-precision proportioning device can be used for accurately controlling the proportion of oxygen and nitrogen; high-purity oxygen and nitrogen mixed gas with the oxygen concentration more than 3 percent and less than or equal to 21 percent is provided for a coal spontaneous ignition simulation device.

Description

technical field [0001] The invention relates to an oxygen and nitrogen mixing high-precision proportioning device and method. Background technique [0002] The spontaneous combustion of coal is due to the oxidation of coal in contact with oxygen. The air leakage in the coal cracks carries oxygen. As it enters into the coal, the oxygen concentration will decrease due to being absorbed by the coal. When the oxygen concentration decreases to a certain value, the heat generated by the coal oxidation will be dissipated, and the coal body will The temperature no longer rises, and the oxygen concentration at this time is called the lower limit oxygen concentration. Studying the oxidation characteristics of coal under different oxygen concentrations and determining the critical oxygen concentration of coal spontaneous combustion is of great significance to prevent coal spontaneous combustion and ensure safe production. [0003] Using the coal spontaneous combustion simulation devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/22
CPCG01N25/22
Inventor 徐长富樊少武姚海飞张群郑忠亚吴海军王海燕李艳川
Owner CCTEG CHINA COAL RES INST
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