Nitrogen oxide detector and small automatic nitrogen oxide monitoring device using detector

Abstract

The invention discloses a nitrogen oxide detector and a small automatic nitrogen oxide monitoring device using the detector. The nitrogen oxide detector comprises a reactor with a conical cavity reaction chamber, wherein a heater is arranged at one end of the reactor; a heat insulation plate and a refrigerator are arranged at the other end of the reactor in sequence; an optical filter is arranged on the heat insulation plate; due to the adoption of the high-finish conical cavity reaction chamber, fluorescent light generated by the reaction of NO and O3 is absorbed by a diode after being reflected and refracted by the inner wall surface of the reaction chamber repeatedly; the content of a nitrogen oxide in a sample gas is determined by a detected weak fluorescent light signal. The detector has high stability; the size of the overall detector is small; accurate nitrogen oxide monitoring data can be provided; the small automatic nitrogen oxide monitoring device manufactured by utilizing the nitrogen oxide detector can be directly arranged outdoors for sampling and measuring, can be hung on a wall or a telegraph pole randomly, and online, real-time, accurate, automatic and on-site monitoring of NO, NO2 and NOx in air can be realized; compared with the conventional monitoring equipment, the small automatic nitrogen oxide monitoring device has the advantages that the cost for installation, operation and maintenance can be saved.

Description

technical field [0001] The invention relates to monitoring equipment for nitrogen oxide gas concentration in the air, and belongs to the technical field of atmospheric monitoring equipment. Background technique [0002] In recent years, with the rapid development of my country's social economy, coal-based energy consumption has risen sharply, and the number of motor vehicles has increased sharply. Economically developed areas NO 2 and VOCs emissions have increased significantly. [0003] NO 2 It has become a routine pollutant that pollutes the air, and it is also a must-measure parameter in air quality standards. [0004] NO 2 The hazards are relatively large, and short-term exposure of vegetation and materials to NO 2 The threshold limit is 940μg / m 3 , the threshold limit for long-term exposure is 190 μg / m 3 . According to the results of population epidemiology and toxicology studies, the short-term exposure concentration exceeds 200μg / m 3 It can cause significant h...

AI Technical Summary

Problems solved by technology

The instruments of most manufacturers are large in size and have harsh operating conditions. They must be installed in a temperature-controlled monitoring station, and the outside air is sampled and measured through the sampling main pipe; the station also has strict requirements on the surrounding environment, such as within a range of 360 degrees. There should be no high obstacles. It is often difficult to select a site in a city with dense high-rise buildings and a lot of land. It is more difficult to realize multi-point networking

Especially in inaccessible areas, it is obviously extremely difficult to set up monitoring stations and maintain them daily

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