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NOx analyzer

A technology for analyzers and separators, applied in the field of NOx analyzers, can solve the problems of large consumption of calibration gas, short zero drift period, large interference, etc., and achieve the effect of strong corrosion resistance

Active Publication Date: 2010-06-09
广东盈峰科技有限公司
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Problems solved by technology

This method has high measurement accuracy, but there are the following problems: 1. It is greatly disturbed by gaseous water molecules. When the water molecule content in the mixed gas is too large, it will directly affect the measured value; 2. The zero drift period is short, and the calibration gas The consumption is large; 3. The mixed gas should be dehydrated and dust-removed for pretreatment

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Embodiment Construction

[0010] The present invention will be described in further detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0011] NOx analyzer, including an infrared light source 1, which can divide the infrared light emitted by the infrared light source 1 into two beam splitters 2, a chopper 3 behind the splitter 2, and a sealed reference parallel behind the chopper 3 Chamber 4 and detection chamber 7, optical filter 5 and optical filter 8 arranged at the optical path exit of reference chamber 4 and detection chamber 7, and a sealed optical coupler is arranged at the optical path exit of reference chamber 4 through optical filter 5 6, and be arranged on the photoelectric sensor 9 between the optical path outlet of the optical coupler 6 and the optical filter 8, the photoelectric sensor 9 is electrically connected with the processor 10 that can carry out signal amplification and signal processing to the electrical signal that the photoelectric...

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Abstract

The invention discloses an NOx analyzer comprising an infrared light source, a chopper, a detection chamber, optical filters and photoelectric sensor. A separator is arranged between the infrared light source and the chopper; a sealed reference chamber parallel to the detection chamber is arranged between the chopper and the optical filter; infrared light emitted by the infrared light source is divided equally into two bundles of light beams which respectively pass through the detection chamber and the reference chamber through the separator; the optical filters are respectively arranged at light path outlets of the detection chamber and the reference chamber; a sealed optical coupler is arranged at the light path outlet of the optical filter, through which the reference chamber passes; and the light path outlet of the optical coupler leads to the photoelectric sensor which is electrically connected with a processor capable of amplifying and processing an electric signal transmitted by the photoelectric sensor. The invention has the advantages that the influence of water molecule on the measurement is effectively overcome, remarkable zero drift does not exist and a gas detection chamber has stronger corrosion resistance.

Description

technical field [0001] The invention relates to a gas analysis instrument in environmental monitoring, in particular to a NOx analyzer for detecting nitrogen oxide (NOx) content in polluted air. Background technique [0002] At present, in the continuous emission monitoring system (CEMS) of stationary pollution sources, the NOx analyzer is a device for detecting the NOx content in the sample gas drawn by the CEMS. The NOx analyzer mainly measures the NOx content in the sampled gas through the selective absorption of infrared light by NOx. By changing the optical signal into a pressure signal and then into an electrical signal, the signal is processed and amplified, and processed by the microprocessor, and finally the NOx concentration is displayed in real time on the LCD on the front panel. [0003] At present, the NOx analyzer of the infrared absorption method emits infrared light of a specific wavelength. Since NOx selectively absorbs infrared light, the intensity of the ...

Claims

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Application Information

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IPC IPC(8): G01N21/35G01N21/3504
Inventor 吕俊鹏陈传富韦常贤
Owner 广东盈峰科技有限公司
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