A gas nitrogen oxide content detection device

Abstract

The invention discloses a detection device for the nitrogen oxide content of a gas, which is used for detecting the concentration of nitrogen oxides contained in the gas. The detection device comprises a treater, a program-controlled current source, a laser, a gas absorption pool, a detector and a signal conditioner. By applying the detection device disclosed by the invention, a high-temperature conversion process is not needed, thus reducing power consumption and energy consumption; and moreover, because the content of the nitrogen oxides in the gas is directly measured, the influence of the existence of other substances on a content detection for the to-be-detected gas is avoided, so that the detection result is more accurate. Furthermore, because a ZrO2 sensor does not need to be used, the problem of poisoning of the ZrO2 sensor due to the compounds of P, S and Si, such as H2S is avoided. Meanwhile, because a ZrO2 sensor technology is a technology monopolized by foreign companies, and the ZrO2 sensor does not need to be used in the detection device disclosed by the invention, the existing technical barrier is broken.

Description

technical field [0001] The invention relates to the technical field of gas content detection, in particular to a gas nitrogen oxide content detection device. Background technique [0002] With the rapid development of my country's automobile industry, the demand will exceed 10 million vehicles. While it has achieved remarkable results in terms of facilitating people's travel and stimulating GDP growth, it has also caused serious environmental protection problems. Motor vehicle exhaust has become an important source of air pollution, which has a serious impact on the health of the people and the sustainable development of the country and society. Therefore, countries all over the world have continuously put forward higher and higher requirements for the treatment of motor vehicle exhaust. my country has enforced the National 3 (Euro 3) standard, and it is expected that the National IV (Euro IV) standard will be enforced on July 1, 2012, which means that the installation of ...

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Problems solved by technology

[0005] 1. After converting NO to O through catalytic reaction 2 In the process of conversion, the temperature of the conversion environment needs to reach a high temperature of 300 degrees Celsius, and the power consumption is high, and the energy consumption is large;

[0006] 2. Since the temperature of the conversion environment needs to reach a high temperature of 300 degrees Celsius, it is subjected to flammable gases such as H 2 , CH 4 , CO content, etc., make the test results greatly affected by the flammable gas content, and the accuracy of the test results is low;

[0007] 3. Compounds of P, S, Si, such as H 2 S, will lead to ZrO 2 Sensor poisoning, resulting in ZrO 2 sensor failure

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