Products/ AQMS
AQMS Air Quality Monitoring System
The AQMS Ambient Air Quality Online Monitoring System serves as an innovative solution designed to monitor and manage air quality effectively. By gathering and analyzing data on environmental pollutants, it empowers organizations to evaluate air quality standards and devise strategies for improvement. This system is essential for implementing control measures that protect both public health and the environment.
The significance of AQMS Air Quality Monitoring Systems extends beyond mere data collection; it plays a vital role in urban management and environmental conservation. With its precise air quality information, this system aids governments and community organizations alike, enabling them to make informed decisions tailored to their specific needs. It bridges the gap between data and practical application, ensuring that the measurements translate into actionable improvements.
In a world where air quality directly impacts public health, AQMS Air Quality Monitoring System does more than just report numbers. It provides a comprehensive framework for understanding and tackling air pollution, making it an indispensable tool in the ongoing challenge of maintaining a clean environment. Ultimately, by facilitating better air quality management, AQMS not only enhances our understanding of pollutants but also contributes to healthier communities.
System Composition
Gaseous pollutant monitoring : SO2, NO, NO2, NOX, O3, CO, PM2.5 and PM10, etc.
Five Meteorological Parameters Analyzer: temperature, humidity, wind direction, wind speed, and atmospheric pressure
System control device, data acquisition system:industrial computer
The AQMS Air Quality Monitoring System comprises four parts: the sampling device, analyzer, calibration device, and data collection system. The gaseous pollutant analyzers consist of SO2, NO, O3, CO, VOCs, Laser Gas (HCl, HF, NH,) Analyzer, and NO2 Analyzer (CAPS Cavity Decay PhaseShift Spectroscopy). The particulate analyzers include PM2.5 Analyzer, PM10 Analyzer, and Extinction Analyzer (Aerosol Analyzer).
AQMS typically consists of the following components:
Principle of chemiluminescence method:
The basic principle of NOx Analyzer is Chemiluminescence. NOx is composed of NO and NO2. The measurement of NO employs that NO absorbs chemical energy after reacting with O3 produce NO2* in excited state.
NO+O3→NO2*+O2
The NO2* in the excited state is not stable and it will release fluorescence in the form of the light quantum in the process of ground state returning. The fluorescence intensity can be measured through PMT and the NO concentration can be calculated.
NO2*→NO+hv1200nm
The NO2 in NOx can be converted into NO through the converter to obtain NO2 concentration after measurement. The NOx concentration can be calculated by adding the two concentrations together.
Principle of Ultraviolet fluorescence method:
The basic principle of SO2 Analyzer is the Ultraviolet Fluorescence Method. Under the excitation of ultraviolet radiation, the SO2 molecules will have the energy level transition and radiate fluorescence of the specific wavelength, The intensity of fluorescence is in direction proportion to SO2 concentration. The SO2 concentration in the air under standard working conditions can be calculated by measuring fluorescence intensity and temperature & pressure compensation.
Principle of Non-Dispersive Infrared Absorption Method (NDIR):
The basic principle of CO Analyzer is Non-Dispersive Infrared Absorption Method (NDIR) Technology. The absorption from CO molecule to infrared light meets with Beer-Lambert Law. The high-energy infrared light passes through a gas chamber full of CO and another gas chamber without CO alternately via a filter wheel. Then it enters a sample absorption cell of which the effective optical path is 14m. The CO concentration in the sample can be calculated by comparing the absorption of infrared energy in the sample and that in the reference gas, and utilizing absorption law.
Principle of UV Spectrophotometry:
The basic principle of Ozone Analyzer is UV Spectrophotometry. The high energy ultraviolet light of the photometer passes through the sample absorption cell and the sample absorption cell will be pumped into sample gas without O3 (remove O3) and sample gas with O3 (not remove O3). The absorbed light intensity can be measured via light detector. At last, O3 concentration can be calculated based on Lambert-Beer Law.
The proportional dilution principle is based on two high-precision mass flow controllers: one passes through a large flow of diluent gas (zero gas), and the other passes through a small flow of standard gas. The gases will be mixed evenly through a quartz gas phase titration chamber and then the proportionally diluted standard gas can be output. The ozonator adopts Ultraviolet lonization Principle: it employs ultraviolet photometer to accurately control oxygen ionization in the air and produce high-precision O3.
The Zero Gas Generator includes an external oil-free air compressor pressure flow controller, water removal system, SO2, NO, NO2, O3 and H2S remover, CO and hydrocarbon remover. The Zero Gas Generator is based on catalytic combustion reaction and absorption filtering principle of molecular sieve to remove SO2, NO, NO2, O3, H2S, CO, NH3, hydrocarbons and particulate matters in the air, and output dry and clean air.
Function: sampling, filtration, heat preservation, anti-corrosion, dilution, backflushing
Dilution ratio: 1:100
Heating temperature: 180°C
Filtration precision: 2μm
Probe temperature, dilution gas pressure and vacuum data show zero air purging to extend the probe maintenance cycle; The gas circuit module and the circuit module are designed separately, which is convenient for later maintenance;
The high temperature in the flue will not affect the dilution core, and the dilution core should still be heated to 180 °C to ensure that the water in the flue gas does not precipitate, and the probe is heated to reduce the adsorption of the gas to be measured in the pipeline; The sampling volume is small, the probe is not easy to block, and the service life of the probe filter is prolonged;
The whole process of hot and humid sampling avoids the measurement interference caused by the dissolution of the components to be measured in water;
The dilution method can lead to more stable readings, resulting in less frequent calibration, saving time and resources. Many modern systems feature intuitive interfaces and automated functions that simplify operation.
This protective measure helps prolong the life of monitoring equipment, ultimately reducing maintenance and replacement costs. By diluting the gases before reaching the analyzers, the risk of damaging sensitive components is significantly reduced.
The accurate measurement and reporting capabilities of dilution extraction CEMS ensure that data submitted to regulatory agencies are reliable. Continuous monitoring allows operators to detect and address emissions issues promptly, enhancing compliance.
This technique ensures that the sample is representative of the overall emissions, allowing for precise monitoring of pollutants. By diluting the sample gas at a controlled ratio, variations in concentration that could lead to inaccuracies in measurement are minimized.
Accurate monitoring aids in identifying and mitigating excessive emissions, thereby helping to minimize environmental impact. The ability to monitor emissions precisely supports companies in their commitment to sustainable and responsible operations.
The system can be utilized in diverse industrial processes, from power generation to manufacturing, ensuring compliance with environmental regulations. This system effectively measures a variety of pollutants, including NOx, SO2, O2, CO, and CO2, using different analyzers tailored to specific gases.
The dilution system significantly enhances system reliability while reducing operational and maintenance expenses. Its average operating cost is only 1/3 to 1/2 of a direct sampling system.
Instant dilution within the probe eliminates condensation effects, removing the need for heated or insulated sampling lines. This prevents potential instrument damage caused by condensation
The accurate measurement and reporting capabilities of dilution extraction CEMS ensure that data submitted to regulatory agencies are reliable. Continuous monitoring allows operators to detect and address emissions issues promptly, enhancing compliance.
This technique ensures that the sample is representative of the overall emissions, allowing for precise monitoring of pollutants. By diluting the sample gas at a controlled ratio, variations in concentration that could lead to inaccuracies in measurement are minimized.
Rapid sample gas transmission, reduced maintenance workload, and minimal consumable usage. Additionally, it supports data processing and report generation
The system can be utilized in diverse industrial processes, from power generation to manufacturing, ensuring compliance with environmental regulations. This system effectively measures a variety of pollutants, including NOx, SO2, O2, CO, and CO2, using different analyzers tailored to specific gases.
AQMS is widely used for real-time urban air quality monitoring. High-precision sensors capture changes in pollutant concentrations, providing data support for city managers. It aids in developing effective pollution control policies, such as traffic restrictions or industrial emission reduction plans. By analyzing pollution data, it helps trace pollution sources and provides scientific guidance for mitigation efforts.
In industrial zones, AQMS monitors whether pollutant emissions from enterprises meet regulatory standards, supporting compliance checks by environmental authorities. Real-time monitoring quickly detects abnormal emissions and warns of potential pollution incidents, ensuring robust environmental oversight in industrial areas.
By publishing Air Quality Index (AQI) data, AQMS assesses the impact of air pollution on public health, particularly for vulnerable groups such as children, the elderly, and those with health conditions. It helps individuals take protective measures and provides data for medical institutions to study the link between air pollution and health issues.
AQMS data provides scientific support for traffic management. During high-pollution days, it helps implement vehicle restrictions, optimize road designs, and reduce the impact of traffic flow and vehicle emissions on air quality, while improving travel efficiency for residents.
AQMS, combined with meteorological data, predicts air quality trends and aids in studying atmospheric dispersion patterns and regional pollution changes. These long-term datasets support academic research and policymaking, offering a theoretical foundation for improving environmental quality.
During pollution events or natural disasters, AQMS provides real-time monitoring of pollution extent and spread, guiding emergency response measures. In incidents such as chemical plant leaks, fires, or sandstorms, AQMS data assists authorities in rapid response and impact assessment.
The sampling probe features a supersonic orifice that ensures a constant gas flow rate when the pressure differential across the orifice exceeds 0.46 times the upstream pressure. This condition is maintained as long as the vacuum level behind the orifice is greater than -53 kPa, regardless of changes in temperature or pressure. Venturi tube downstream of the orifice creates sufficient vacuum by directing the dilution air flow, enabling consistent gas intake. The entire process relies on aerodynamic principles, with stable operation ensured by a continuous supply of instrument air (0.6 MPa, 20 L/min).
The Venturi tube also acts as a flow restrictor, controlling the flow rate of the dilution air. Multi-stage pressure regulators maintain the dilution air at a consistent pressure (typically 0.35 kPa). Stable dilution air pressure not only ensures a consistent vacuum in the Venturi tube but also guarantees a steady flue gas intake, maintaining the overall dilution ratio.
The supersonic orifice minimizes the influence of temperature and pressure fluctuations on the dilution ratio. By operating at critical flow conditions, the orifice ensures that the volumetric flow rate of gas through it depends solely on the gas velocity, which is close to the speed of sound.
Calibration gas is introduced at the probe's front end and follows the same path as the sample gas to the analyzer. This method validates the consistency of the dilution ratio and eliminates system-wide errors, ensuring accuracy across the entire system.
The probe integrates a critical orifice (supersonic orifice) with a 0.1 µm fine filter to prevent dust blockages. 2.A Venturi tube, powered by pressurized clean air, generates the necessary vacuum. This system uses 3–7 liters of compressed air, which is directed through a nozzle to create suction, ensuring efficient and stable operation of the dilution system.
It is essential to integrate effective sample conditioning units that can remove moisture, particulate matter, and other contaminants. Maintaining appropriate temperatures within the system is vital to prevent condensation, which can skew results. Systems must be insulated and, if necessary, heated to avoid inaccuracies due to temperature fluctuations.
Standard dilution ratios, such as 100:1, may be employed to mix the flue gas with clean, dry air. This dilution must be precisely controlled to match the requirements for specific gases being detected. Incorporating adjustable dilution mechanisms allows operators to modify settings based on real-time conditions of the gas being monitored and regulatory requirements.
Analyzers must be selected for their robustness and capability to function optimally in the specific environmental and operational conditions of the facility. Different gases require distinct analytical techniques.
Incorporating self-diagnostics can alert operators to system malfunctions before they impact data collection. Designing systems that are straightforward to maintain, with easily accessible components, can help ensure technicians can perform regular checks and repairs without significant downtime
The design should facilitate continuous real-time monitoring capabilities to allow for immediate responses to emissions changes, enhancing operational control.Systems must support seamless integration with data reporting tools to ensure accurate compliance documentation can be generated without manual entry, thereby minimizing human error.
The design must consider varying environmental parameters and include features that allow the system to adapt. For instance, if ambient temperatures are prone to fluctuation, temperature-regulating equipment needs to be factored into the CEMS design. Robust Material Selection: Materials used in the construction of sampling lines, probes, and other components must be resistant to corrosion and degradation from environmental influences to enhance longevity and reliability.
| Measurement Factors | NOx, NO2, NO, SO2, O3,CO | Unit | nmol/mol (ppb), μmol/mol 33 (ppm) μg/m, mg/m (Optional) |
|---|---|---|---|
| Measuring Range | NOx, NO2, NO: 0-500ppb or 0-20ppm SO2: Min:(0-500)nmol/mol (ppb); Max:(0~20)μmol/mol (ppm) (Optional) O3: 0-500ppb or 0-20ppm CO: (0~50)μmol/mol (ppm) | Voltage stability | ±0.5% F.S. |
| Response Time | NOx, NO2, NO: <120s SO2: <120s O3: <60s CO: <120s | Flow stability | NOx, NO2, NO: (500±10%)sccm CO: (800±80)sccm O3: (800±80)sccm CO: |
| Zero noise | NOx, NO2, NO: <0.2ppb SO2: <0.5ppb O3: <0.2ppb(RMS) CO: ≤0.25ppm | Effect of ambient temperature changes | NOx, NO2, NO: <1 ppb/°C SO2: <0.5 ppb/°C O3: <0.5 ppb/°C CO: <0.1 ppm/°C |
| LDL | NOx, NO2, NO: 0.4 nmol/mol (ppb) SO2: ≤1ppb O3: 0.4ppb CO: ≤0.5ppm | Concentration Deviation | NOx, NO2, NO: ≤0.5% SO2: <15kg, external pump: 5kg O3: ≤0.5% CO: |
| 24h Zero Drift | NOx, NO2, NO: ±2ppb SO2: ±2.5ppb O3: ±2.5ppb CO: ±0.25ppm | 7d long term zero drift | NOx, NO2, NO:±5ppb/7d SO2: 200V~240V, 50/60Hz, 400W O3: ±5ppb/7d CO: ±0.5ppm/7d (24h range drift: ±2ppm) |
| 24h 20% span drift | NOx, NO2, NO: ±2ppb/24h SO2: ±2ppb/24h O3: ±2ppb/24h CO: <0.2ppm/24h | 7d long term span drift | NOx, NO2, NO: ±10ppb/7d SO2: 10V, 5V, 1V,0.1V (optional) O3: ±10ppb/7d CO: ±1ppm/7d |
| 24h 80% span drift | NOx, NO2, NO: ±5ppb/24h SO2: ±5ppb/24h O3: ±5ppb/24h CO: <0.5 ppm/24h | Repeatability | < 1% |
| Linearity | <1%/F.S. | Span noise | NOx, NO2, NO: ≤1ppb SO2: ≤ 2ppb O3: ≤0.5% F.S. CO: ≤0.5ppm |
| Indication error | ±1%F.S. | Working Humidity | (0~85)% RH |
| Working temperature | 15°C ~ 35°C | Weight | NOx, NO2, NO: <16kg SO2: <15kg O3: <10kg CO: < 20kg |
| Dimension | 178 mmx432 mmx635 mm | Communication | RS232/RS485 |
| Power Supply | (220±20)V;(50±1)HZ | 80% range precision | NOx, NO2, NO: ≤2ppb SO2: ≤2ppb O3: CO: ≤0.4ppm |
| 20% Range Precision | NOx, NO2, NO: ≤2ppb SO2: ≤2ppb O3: CO: ≤0.4ppm | Sample Gas Flow | SO2: 5°C ~ 40°C |