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A vehicle exhaust gas nitrogen oxide detection system

A nitrogen oxide and detection system technology, which is applied in the direction of measuring devices, preparation of test samples, and analysis through chemical reactions of materials, can solve the problems of low reduction rate of carbon reduction reaction and affecting the accuracy of measurement, etc.

Active Publication Date: 2019-05-24
ZHEJIANG UNIV MINGQUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the heating temperature limit of the device is 250°C, the content of the reaction chamber at this temperature is carbon, and the reduction rate of the carbon reduction reaction is not high, which will affect the accuracy of the measurement
At present, the most efficient reducing agent for converting nitrogen dioxide into nitrogen monoxide is metal molybdenum, and the reduction reaction of metal molybdenum needs to reach a high temperature of 350°C. The device with application number: 201510766902.0 cannot withstand such a high temperature

Method used

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  • A vehicle exhaust gas nitrogen oxide detection system
  • A vehicle exhaust gas nitrogen oxide detection system
  • A vehicle exhaust gas nitrogen oxide detection system

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Effect test

Embodiment 1

[0024] Such as Figure 1~Figure 4 A conversion device for converting nitrogen dioxide into nitric oxide is shown. The gas conversion device includes an inlet pipe 5, a heating section, a reaction section and an outlet pipe 17. The inlet pipe 5 is arranged in the heating section, and the outlet pipe 5 The air pipe 17 is arranged in the reaction section, and the heating section and the reaction section are connected to each other; the outside of the heating section and the reaction section are respectively provided with insulation layers 21 to realize heat insulation from the outside. Such as figure 1 As shown, the heating section includes a heating part 2, a heating cylinder 4 and a thermally conductive filling wire 6. A heating chamber is arranged inside the heating cylinder 4, and the heating part 2 is arranged on the heating cylinder 4. The heating part 2 is a heating rod, the heating rod is inserted into the heating cylinder 4, the outside of the heating rod is fastened by...

Embodiment 2

[0036] A vehicle exhaust nitrogen oxide detection system, the system includes an exhaust gas collection device, an air pump, a gas conversion device and an optical detection platform, the front end of the air pump is connected to the exhaust gas collection device through a pipeline, and the rear end of the air pump is connected to the gas conversion device through a pipeline The air inlet pipe 5, the optical detection platform is connected to the gas outlet pipe 17 of the gas conversion device through a pipeline, and the gas conversion device adopts a conversion device for converting nitrogen dioxide into nitric oxide described in Embodiment 1 to convert the nitrogen dioxide into nitric oxide through heating and reduction. Nitric oxide is converted to nitric oxide.

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Abstract

The invention relates to the field of detection of automobile tail gas and particularly relates to a detection system for nitrogen oxide in the automobile tail gas. The system comprises a tail gas collection device, a gas pump, a gas conversion device and an optical detection platform, wherein the front end of the gas pump is connected with the tail gas collection device through a pipeline; the rear end of the gas pump is connected with a gas inlet pipe of the gas conversion device through a pipeline; the optical detection platform is connected with a gas outlet pipe of the gas conversion device through a pipeline; and the gas conversion device is used for converting nitrogen dioxide into nitrogen monoxide through heating reduction. According to the detection system provided by the invention, the gas conversion device can be used for enabling a gas temperature to reach a high temperature which is more than or equal to 600 DEG C and the device is not damaged; and furthermore, molybdenum reduction is adopted and the conversion rate of the nitrogen dioxide can reach 95% or more.

Description

technical field [0001] The invention relates to the field of automobile exhaust detection, in particular to an automobile exhaust nitrogen oxide detection system. Background technique [0002] According to statistics from the Traffic Management Bureau of the Ministry of Public Security, as of the first half of 2016, the number of motor vehicles in the country reached 285 million, including 184 million cars. The number of cars keeps growing rapidly, and at the same time, the total amount of pollutants emitted by cars is also rising. [0003] With the "Twelfth Five-Year Plan" binding target: the total amount of nitrogen oxide emissions in 2015 will be reduced by 10% compared with 2010. One of the four binding indicators of electricity, industry, motor vehicles and life. Various regions have issued motor vehicle emission control policies one after another. [0004] Automobile exhaust nitrogen oxide detector is an instrument for measuring the concentration of nitrogen oxide e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/75G01N1/44G01N1/22
CPCG01N1/2252G01N1/44G01N21/75
Inventor 朱坚磊康野丁宗英赖月邵高卿范佳刘天虹
Owner ZHEJIANG UNIV MINGQUAN TECH