Continuous Emission Monitoring Systems are used to monitor flue gas for the presence of Carbon Monoxide (CO), Sulphur Di-Oxide (SO2), Oxides of Nitrogen (NOx), Carbon Di-Oxide (CO¬2) and Oxygen (O2). CEMS analyzers provide crucial information on the industrial combustions and are used to tune and control emissions.
Flue gases are one of the chief causing factors of Acid Rain and their composition of hazardous gases shall be controlled as per CPCB guidelines. In addition to afore-mentioned gases, other gases such as Ammonia (NH3), Hydrogen Chloride (HCl), Hydrogen Flouride (HF), Methane (CH4), etc are also measured using CEMS analyzers.
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Continuous Emission Monitoring System (CEMS)
Apart from Oxygen, all the other gases are measured using Non-Dispersive Infra Red (NDIR), Laser Absorption Spectroscopy (LAS), Tunable LAS (TDLAS), Electro Chemical (EC), Chemiluminescence (CLD), and Photo Acoustic (PAS) sensors. Oxygen is measured using EC, Paramagnetic or Zirconia measurement. In these gases, CO2 and O2 are measured in percentage (%) while the others are measured in parts per million (ppm) or parts per billion (ppb).
Working principle :
Our CEMS analyzers use Cool-Dry Extraction method to extract the flue gases for measurement. A sampling probe with built-in mesh filter is installed in the stack to extract the flue gas. The extractive type CEMS systems cool the sample under controlled conditions to condense the water out and dry the sample. Once the sample has been cooled and dried, it is then sent to an analyzer. This method is referenced as the cool, dry or just dry basis analysis. But some of the gases are either partially or fully water soluble. By cooling the sample and removing the water for a cool dry analysis, some of these gasses that have dissolved in the moisture can also be removed from the gas as the water is condensed. An error can be induced on gasses such as SO2 and NO2. Along these same lines, it is impossible to measure highly water soluble gasses like NH3, HCl and HF.
Features :
Fast Response time, High Sensitivity, High Precision, Low Drift and easy for Maintenance.
Immune to cross sensitivity between the gases.
5” to 7” TFT display to monitor the gases simultaneously.
The LAS, TDLAS, PAS, CLD type of CEMS analyzers offers high sensitivity in the order of ppb to ppm.
Our CEMS analyzers have auto calibration and remote calibration features making them easy to maintain.
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Portable Flue gas Detector
In some industries, the flue gas analyzers need to portable which are carried to the stack locations and the presence of gases are measured by installing the sample probe inside the stack as the stacks will be in operation for a very small duration of time. Hence, the sampling probe has to be easily inserted and removed unlike the fixed CEMS analyzers.
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Stack Dust Monitor
PRINCIPLE OF OPERATION :
MIP LM3189 Laser Dust Monitor - The measuring system is based on the single pass principle. The light beam crosses the measuring section once only and the receiver unit measures and evaluates the light beam’s weakening caused by the dust content. The optical value will be shown as optical density on analogue display and optical density related to mass value on digital display. Manual-calibration check can be done using optical filter.
Features :
Laser light source-ultimate wavelength stability, excellent collimation and high sensitivity
Minimum optics needed - less maintenance
Optimal for stacks up to 20 meters (with optional 100mm lens up to 40 meters)
No moving parts-minimal maintenance
Large operation range ( 0 ... 90 %)
Good stability and reliability
Advantages of using a Laser Light Source :
Measuring path up to 20 meters possible, due to a narrow and intense laser light beam.
Excellent beam collimation (0,04 °) - no need to use lenses or mirrors in the transmitter making the system reliable and simple
Standard wavelength guarantees long-term accuracy and stability
The analyser can be transferred to another location without factory calibration.
The alignment of the beam is easy because the beam is narrow.
Features of the monitor unit :
4 operator selectable measuring ranges
Analogue and digital display
Settable alarm relay limit
0 ... 1 V DC and 4 … 20 mA current outputs
Typical Applications :
Power plants
Cement factories
Incinerators