Device and method for detecting component concentration of mixed gas and application

A mixed gas and concentration detection technology, applied in the direction of material thermal development, etc., can solve the problems of limited application range, high cost, and large volume

Active Publication Date: 2022-01-21
武汉祺璞科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the deficiencies of the existing mixed gas sensing technology and gas calorific value measurement technology, as well as the limitation of application range due to high cost and large volume, the present invention proposes a sensor for constant volume gas thermal conductivity spectrum analysis of mixed gas components, And this sensing technology is applied to the gas calorific value instrument module, which solves the difficulty of gas calorific value detection technology

Method used

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  • Device and method for detecting component concentration of mixed gas and application
  • Device and method for detecting component concentration of mixed gas and application
  • Device and method for detecting component concentration of mixed gas and application

Examples

Experimental program
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Effect test

Embodiment 1

[0124] Such as figure 1 , a device for detecting the component concentration of a mixed gas. The measuring gas chamber 1 with a fixed volume is a cylinder made of Invar. The inner size of the container is Φ3cm×length 5cm. The inner surface of steel is smooth and clean, and it is made by welding process. The measuring gas chamber 1 is a closed chamber with an input pipe 2 and an output pipe 3. The input pipe 2 and the output pipe 3 are stainless steel pipes with a diameter of Φ3mm, and equipped with a miniature electric stop valve 4 to realize the opening of the input and output gases , Shut-off control, under the control of the controller 5, input 35.34ml of the mixed gas to be tested at 1 atmosphere into the measuring gas chamber 1, and output the gas to be tested after the test is completed. If the gas to be tested has no pressure, it is necessary to increase the suction pump to inhale the gas to be tested.

[0125] A micro MEMS gas pressure sensor 6 and a temperature sens...

Embodiment 2

[0147] Such as figure 2 , a device for detecting the component concentration of a mixed gas, the measuring gas chamber 1 and the reference gas chamber 11 with a fixed volume are fired by ceramics, and the cavity is separated to form two sealed cavities (the measuring gas chamber and the reference gas chamber ), the inner surface of the cavity is smooth. Both cavities have a volume of 20ml, the internal dimensions of the container are 5cm in length x 2cm in width x 2cm, and the thickness of the ceramic is 2mm. The measuring gas chamber 1 is a closed chamber with an input pipe 2 and an output pipe 3. The input pipe 2 and the output pipe 3 are stainless steel pipes with a diameter of Φ2mm, and equipped with a miniature electric stop valve 4 to realize the opening of the input and output gases 1. Shut-off control, under the control of the controller 5, input 20ml of mixed gas to be tested at 1 atmosphere into the container, and output the gas to be tested after the test is compl...

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Abstract

The invention discloses a component concentration detection device, method and application of a mixed gas, which regulates the temperature of the mixed gas in the measuring gas chamber to T 1 , the heating element is heated to a temperature T 1 +ΔT, at the same time measure the temperature of the mixed gas at the distance L from the heating element, and feedback the heating power of the heating element to keep the temperature of the heating element constant, so that the heat dissipated by the gas conduction is equal to the consumption of maintaining the constant temperature of the heating element The electric power can measure the thermal conductivity of the combined gas. When the mixed gas to be tested is adjusted to multiple temperatures sequentially, the thermal conductivity of the mixed gas is measured by the above method, and then a multivariate linear equation system is established based on the thermal conductivity of the gas with known components and types. The number of equations in the equation group is greater than or equal to the number of the unknown quantity to be measured, that is, the gas concentration, and the concentration of each gas in the mixed gas is obtained by solving the linear equation group according to the least square method.

Description

technical field [0001] The invention belongs to the field of gas component measurement and measurement, and in particular relates to a component concentration detection device, method and application of a mixed gas. Background technique [0002] A gas sensor is a device that converts a certain gas concentration, or information such as the component type and concentration of a mixed gas into a corresponding electrical signal, and outputs gas data information that can be used by personnel, instruments, computers, etc. The main sensitive characteristics of gas sensors include technical indicators such as sensitivity, selectivity, stability, and corrosion resistance, which are mainly determined by the sensitive principle of the gas sensor and the selection of sensitive materials. In different application scenarios, different indicators of the sensitivity characteristics of gas sensors are emphasized. [0003] A single gas sensor such as methane sensor, oxygen sensor, hydrogen s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 吴亚明肖效薛智
Owner 武汉祺璞科技有限公司
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