Online detector for nitrogen oxides in exhaust gas

1、 Instrument Overview

Online detector for nitrogen oxides in exhaust gasIt is a method used for continuous and real-time monitoring of nitrogen oxides (mainly including nitric oxide) in exhaust gases emitted from fixed pollution sources such as thermal power plants, industrial boilers, chemical enterprises, etcNOAnd nitrogen dioxideNO₂Usually, inNOxA specialized analytical instrument for measuring the concentration of its total amount. This instrument can provide accurate and timely monitoring data for doors, helping enterprises achieve standard emission management of pollutants, and providing scientific basis for air pollution prevention and control decisions. Its core function is to automate and continuously analyze complex gas composition processes, and achieve remote monitoring and data reporting through a data transmission system.

2、 Main components

1. Sampling preprocessing systemResponsible for extracting representative exhaust gas samples from the emission pipeline and performing necessary treatments on the samples, such as dust removal, dehumidification, filtration, pressure stabilization, and flow stabilization, to remove interfering substances, protect subsequent analysis units, and ensure that the gas entering the analytical instrument meets detection requirements. The performance of the preprocessing system directly affects the accuracy and stability of the detection results, usually including components such as sampling probes, heat tracing pipelines, filters, condensers, gas-liquid separators, etc.

2. Analysis UnitCore detection component, based on specific gas analysis principles, measures the concentration of nitrogen oxides in pre treated samples.

3. Data Collection and Processing SystemComposed of a data acquisition card, industrial control computer (or dedicated embedded controller), and corresponding software. Responsible for collecting and analyzing electrical signals output by the unit, performing analog-to-digital conversion, data calculation, result display, storage, and communication with the upper computer or data platform. The system has functions such as data recording, historical data query, report generation, and fault alarm, and can report monitoring data in the format and frequency required by national or local environmental standards.

4. Calibration and auxiliary systemsIncluding standard gas calibration devices, zero gas generators, etc. Standard gases are used for regular calibration of instrument accuracy to ensure the reliability of detection data; The zero gas generator provides clean air or nitrogen as the zero calibration gas and background gas for instrument operation. In addition, the instrument may also be equipped with auxiliary modules such as temperature control and pressure monitoring to ensure stable operation of each system under suitable environmental conditions.

5. data transmission systemUsually wired (such as EthernetRS485/232）Or wireless (such asGPRS/4G/5GTheLoRaTheNB-IoT）Communication method: Real time monitoring data and instrument status information are sent to the internal monitoring center of the enterprise or the remote monitoring platform of the environmental protection department, achieving real-time data sharing and remote supervision.

threeTechnical features and advantages

1. Real time online monitoring: Capable of continuous operation24Continuous operation for hours, real-time reflection of changes in nitrogen oxide emission concentration in exhaust gas. Compared with traditional manual sampling analysis, it has higher time resolution and timeliness, and can detect emission anomalies in a timely manner.

2. High degree of automationThe process from sample collection, preprocessing, analysis to data processing, transmission, calibration, etc. can be automated, reducing manual intervention, lowering human errors, and improving work efficiency.

3. High measurement accuracy and good stabilityThe detection principle and high-precision sensors and electronic components used, combined with comprehensive temperature and pressure control and data compensation algorithms, ensure that the instrument has high measurement accuracy and good long-term operational stability.

4. Strong data reliabilityEquipped with comprehensive calibration functions and quality control measures, it can regularly perform zero point calibration and span calibration, and can monitor and diagnose instrument operation status in real time to ensure the effectiveness and reliability of monitoring data.

5. Compliant with environmental standardsInstrument design and manufacturing strictly follow relevant national technical specifications and standards (such asHJ 654-2013Gaseous pollutants in ambient air（SO₂TheNO₂TheO₃TheCO）The technical requirements and detection methods for continuous automatic monitoring systems, as well as the specific standards, need to be confirmed according to the application scenario. The data format and communication protocol meet the data networking requirements of the environmental protection department and can be directly used for the execution of pollutant discharge permits, environmental supervision, etc.

6. Adapt to complex working conditionsThe pre-treatment system can effectively remove interfering substances such as dust, water vapor, and corrosive gases from exhaust gas. The instrument as a whole has certain anti-interference ability and environmental adaptability, and can work stably under harsh conditions in industrial sites.

5、 Typical application scenarios

1. Thermal power generation industryUsed to monitor the emission concentration of nitrogen oxides in the flue gas of coal-fired power generation unit boilers, it is an important basis for thermal power enterprises to implement ultra-low emission standards, evaluate the efficiency of desulfurization and denitrification facilities, and optimize their operation.

2. Industrial boilers and kilnsReal time monitoring of emissions from industrial boilers, sintering machines, rotary kilns, and other sources in industries such as steel, cement, glass, and ceramicsNOxEmission status helps enterprises achieve clean production and meet emission standards.

3. Chemical and petrochemical industryNitrogen oxides are common characteristic pollutants in processes such as nitric acid production, ammonia synthesis, coal chemical industry, and petroleum refining. Online detectors can effectively monitor process exhaust gases and emissions.

4. Garbage incineration treatmentDuring the process of garbage incineration, a large amount of nitrogen oxides are generated. The online monitoring system is used to ensure that the waste gas emissions from the incineration plant meet environmental requirements and prevent secondary pollution.

5. Other fixed sources of pollutionFor industries such as non-ferrous metal smelting, painting, printing, etc., this type of instrument can be used for fixed pollution sources that involve nitrogen oxide emissions and require continuous monitoring.

Environmental Air Quality Warning and ResearchIn some cases, it can also be used for long-term continuous observation of nitrogen oxides in the ambient air of specific areas (such as industrial park boundaries), providing data support for atmospheric environmental quality research and early warning forecasting.

(Note:Online detector for nitrogen oxides in exhaust gasThe specific configuration needs to be customized according to the boiler tonnage, fuel type, and local environmental requirements