54 AIR MONITORING
New versatile and accurate laser gas analysers for the measurement of NH3 CH4
, CO2 , (H2 O)
Latest tailor made solution for nitrous oxide monitoring
, HCl,
Nitrogen oxides (NOx) are a by-product of nearly every combustion process. The term “nitrogen oxides” usually describes two gases: nitrogen monoxide (NO), a colourless and odourless gas, and nitrogen dioxide (NO₂), a reddish-brown gas with an irritating odour. Both gaseous pollutants have diverse negative effects on the environment and human health. They react with ozone molecules in the stratosphere, accounting for the destruction of the ozone layer. They also play a significant role in the formation of “unwanted ozone” (or ground level ozone) that contributes to the creation of photochemically induced smog.
ETG Risorse e Technologia’s new gas analysers, the ETG 6900 P (Portable & Stationary), are a perfect, laser-based tool for the detection of NH3, HCl, CH4, CO2 in a variety of applications. For example, the accurate measurement of unreacted ammonia (NH3), or ammonia slip, is of great concern for operators of utility boiler systems which use urea - or ammonia-based selective catalytic reduction (SCR) or selective non- catalytic reduction (SNCR) processes for NOx control.
The ETG 6900 P is also ideal for the measurement of HCl in the incineration process. HCl is not only of importance for environmental issues, it can also cause significant damage to plant equipment. In the incineration process, the organic component is destroyed and chlorine is converted to HCl. HCI is a colourless and pungent smelling gas, which forms corrosive hydrochloric acid which is then a destructive presence within the atmospheric humidity. Typically affected plants include waste incinerators (municipal, hazardous and sewage sludge) and plants that use waste for co-incineration (e. g. cement plants, power plants or biomass plants).
Moreover, ETG’s new analyser effective for measuring CH4 and CO2 greenhouse gases, both of which are very important problem for planet life. The most important anthropogenic greenhouse gases (GHGs) are CH4 and CO2, and the CH4 global warming potential is 20–28 times of the CO2’s one over a 100-year time frame.
ETG detects all of these compounds using TDLS enhanced technology for gas detection This operates whereby a 0.1 nm narrow bandwidth diode laser beam scans across an absorption band of the target gas, thus performing a high-resolution near-infrared absorption measurement.
The ETG 6900 series are highly reliable and ready-to-use devices for the measurement of gases such as NH3, HCl, CH4, CO2, (H2O). The high level of sensitivity and large dynamic range of the Tunable Diode Laser Spectrometry detection technology enables measurements from sub- ppm level to high percentages of concentration to be taken by the same analyser, without the need to adapt it to the very different environments.
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To ensure compliance with TUV QAL1 (EN 15267) and future regulations, along with savings in NOx taxes, the use of precise and reliable chemiluminescence detectors, which are the standard reference method for determination of nitrogen oxides in stationary source emissions according to the European Norm EN 14792 (2017), is the key factor. Based upon the experience with the widely applied CLD 700 ELht, CLD 822 Mh and CLD 822 CMhr, not only in the field of continuous emissions monitoring but also in research on low NOx burner design and testing of catalysts for SCR, ECO PHYSICS has developed the standardised nCLD EL2. The two-channel, chemiluminescence-based NOx analyser detects NO, NO2 and NOx at concentrations ranging from 5ppm to 5000ppm with minimal detection limits averaging from 0.05ppb to 0.5ppm. To ensure accordance with the sample conditions, the nCLD EL2 is tailor-made, equipped with a metal converter for highest conversion efficiency in the related measurement range and a heated sample inlet for increased humidity tolerance.
New gas cooler solves the costly problems of excessive heat in gas conditioning units
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The removal of moisture is an essential step for extractive sample gas conditioning systems. However, this process generates problematic, excessive heat inside the cabinets and thus very often requires a costly solution such as air conditioning to reduce the temperature.
The new TC- kit (+) gas cooler series from Bühler Technologies eliminates this problem. Peltier elements used as a temperature transmitter are the middle part of a sandwich consisting of a heat sink with integrated fan forming the outer part and a cooling block with exchangeable heat exchangers and the attached electrical terminals as the inner part. For the installation a cut out has to be made at the appropriate side wall of the cabinet.
With the heat sink geometrically counter-balancing the internal parts, the unit slides into the cut out and is finally attached to the outside wall of the cabinet and sealed by a gasket. The electrical leads and the sample gas lines are kept
inside the cabinet whereas the thermal load is dissipated to the exterior keeping the inside of the cabinet considerably cooler.
The TC Kit (+) requires 24VDC as power supply. As an option an extension unit for 115/ 230V AC supply is available and will be attached directly to the main unit. This extension also provides all necessary connections to auxiliary units such as sample gas and condensate pumps as well as moisture detectors and heated sample lines.
The operational parameters and alarm settings are programmable by a remote controller with a digital display. This controller can be installed at the most convenient location within the conditioning cabinet. The TC Kit+ version also has special heat exchangers with minimised wash out effect as required by EN 15267-4 and therefore suitable for automated emission monitoring (AMS) systems. The protection class of the mounted unit is IP 54.
Site Boundary Monitoring
• Configurable with dust, noise, vibration, VOC, wind speed and direction sensors
• Automated text/email alerts to multiple people
• Mains, solar or battery powered with simple plug and play installation
• Online data portal with optional FTP data transfer
Regent House, Wolseley Road, Kempston, Bedford, MK42 7JY, UK T: +44 (0)1234 844179 E:
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continuous emission monitors ACOEM Dynoptic’s range of continuous emission monitors include simple-to-install single and double pass dust monitors that use DDP technology (dynamic detection principle) to measure the concentration of dust or particulate matter in exhaust gas passing through a duct, stack or flue.
The innovative DDP technique, sometimes referred to as scintillation or dynamic opacity, measures fluctuations in the intensity of a light beam as it passes across the stack. Increased dust or particulate
density in the stack causes the amplitude of these fluctuations to rise. When calibrated against standard reference measurements, the amplitude of this signal relates directly to the dust concentration in the stack and this can be presented as a reading in mg/m³.
A major advantage of DDP over opacity measurements is that the signal is almost independent of the mean transmission value. As a result, maintenance periods can be extended because the instrument can tolerate higher levels of optical contamination and greater optical misalignment before the measurement sensitivity is adversely affected. This can help reduce costs and downtime.
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