In situ nitrogen oxide detection equipment

In situ nitrogen oxide detection equipment：It is a device that can be directly installed in the flue or chimney to monitor the concentration of NOx in the flue gas in real time without sampling pretreatment. Its core advantages are fast response speed and strong anti-interference ability, especially suitable for complex projects such as high temperature, high humidity, and high dust

1、 Technical Principles and Core Technologies

1. Mainstream detection technology

Dual cell thick film zirconia sensor technology

Calculate the NOx concentration based on the maximum current generated by the oxygen concentration difference on both sides of the zirconia ceramic tube, using typical products such as Shaanxi Bochun PUE-601A. This technology can directly measure at high temperatures ranging from 0-500 ℃ without the need for condensation dehumidification. The response time is less than 60 seconds, and the accuracy can reach ± 2% FS to ± 10ppm at different ranges. However, attention should be paid to the humidity of the flue gas, as the sensor may be damaged due to condensation when the temperature is below 100 ℃.

Laser Spectroscopy Technology (TDLAS)

Based on the principle of tunable semiconductor laser absorption spectroscopy, such as PUE-601A from Shaanxi Bochun, it can penetrate high dust environments with a response time of less than 1 second, an accuracy of ± 1% FS, and does not require frequent calibration. This technology is particularly suitable for real-time monitoring of SCR denitrification inlet/outlet.

Ultraviolet Differential Absorption Spectroscopy (DOAS)

By utilizing the characteristic absorption spectrum of NO2 in the ultraviolet band, such as the Shaanxi Bochun PUE-601A portable monitoring system, it is possible to simultaneously measure NO, NO2, and SO2 with an accuracy of 0.05mg/m ³. This technology does not require chemical reagents and has low maintenance costs, but it requires regular cleaning of optical lenses to avoid dust pollution.

2. Key technological innovation

The anti-interference design of Shaanxi Bochun PUE-601A series adopts mid infrared laser spectroscopy technology, which eliminates background gas interference such as CO2 and H2O through wavelength modulation, and achieves NOx measurement error<± 2% in the flue gas of steel sintering machine.

Intelligent operation and maintenance: Equipped with dual detector redundancy design, it can automatically switch between primary and backup channels and perform in-situ calibration, with a maintenance cycle extended to 3-6 months.

Explosion proof and safety: ATEX certified, suitable for explosive gas environments, such as high concentration VOCs scenarios in waste incineration plants.

2、 Market Applications and Typical Cases

1. Key industry applications

Thermal power and gas-fired power generation: In SCR denitrification systems, in-situ detectors are used for precise control of ammonia injection rate.

Steel and Metallurgy/Chemical Industry and Waste Incineration: FT-Nox5000 in a flame environment operates stably under high temperature (550 ℃) and high sulfur (H2S concentration>1000ppm) conditions, helping a chemical enterprise achieve a denitrification efficiency of over 95%.

2. Special scenario adaptation

High temperature and high dust: Shaanxi Bochun PUE-601A adopts 316L stainless steel sintered filter element (precision 20 μ m) and timed blowback function. It has been continuously operated for 18 months without blockage at the kiln tail of the cement plant (dust concentration>200g/m ³).

High humidity environment: Hot wet in-situ detection technology is used to heat the entire process up to 180 ℃, avoiding SO2 dissolution in condensed water, and achieving stable measurement at 90% RH in the alkali recovery furnace of the paper mill.

5、 Selection suggestions and technological trends

1. Key points of selection

Working condition adaptation:

Laser spectroscopy type (such as PUE-601A) is preferred for high temperature (>300 ℃) and high dust;

Recommended hot wet zirconia sensor for high humidity (humidity>80% RH);

Complex components (such as NH3 and HCl) require the use of strong anti-interference mid infrared laser technology.

Compliance: Confirm whether the equipment has passed CCEP certification and whether the data output protocol is compatible with local environmental protection platforms (such as the HJ212 protocol required by Shaanxi Province).

Cost balance: For long-term operating projects (>5 years), it is recommended to choose laser spectroscopy type, while for short-term projects, zirconia type can be considered to reduce initial investment.

3、 Technical parameters

4、 Application Fields

Detection of NOx in combustion devices such as high-temperature boilers;

Detection of NOx in denitrification systems and desulfurization units;

Diesel engine and marine engine exhaust testing;

Detection of combustion exhaust gases in industries such as steel, cement, and power plants;

Real time concentration detection of NOx and O2 at the inlet and outlet of SCR for denitrification, and calculation of denitrification removal rate;

Multi industry application of precise ammonia spraying scenarios.

In situ nitrogen oxide detection equipment：Our store specializes in smoke and gasCEMSOnline monitoring, water quality online monitoring,VOCsOnline monitoring, industrial process gas analysis, ammonia escape gas online analysis, nitrogen oxide detector, acid dew point meter and other gas detection instruments and accessories, data acquisition and analysis systemManufacturer direct sales, welcome to call for inquiry and comparison.