34 Air Monitoring Continuous Measurement of Flue Gases in Rotary Kilns of Cement Plants
Hot cement raw meal with temperatures of up to 950 °C, high speeds and high temperatures of the dust-laden flue gas of up to 1200 °C: The difficult conditions found directly at the measuring point in the furnace inlet of rotary kilns making capturing of gas values difficult.
Thanks to the InSitu measurement, the smallest changes can be quickly detected and thus the consumption of fuel can be precisely controlled. It is necessary to regulate to the smallest possible oxygen value in order to keep emissions low and at the same time ensure that the system runs efficiently and safely. By continuously measuring the gas concentration it is possible to determine if the combustion process is optimised, and when not, the airflow can be adjusted accordingly.
The CEMTEC system features a patented swivel drive, through which the probe shaft rotates at set intervals in a radial direction. This prevents the probe from cementing stuck within the combustion chamber and prevents the probe tube from being thermally deformed. If for instance a power failure or coolant leakage occurs, the 200 kilogram probe is automatically driven out of the oven on rails by a pneumatic traversing device. The required compressed air for this is supplied by a reserve tank.
In addition, the system cleans itself every three minutes. "In the cooling tube we can have installed a large surface dust filter with a pneumatic impact plate which moves out at certain intervals and removes even the toughest of deposits," explains Fred Gumprecht, managing director of ENOTEC (Germany).
Reader Reply Card No. Bar Raised for Emissions Analysers
Gasmet Technologies (Finland) have announced that their FTIR-based Continuous Emissions Monitoring System (CEMS) has received approval from TÜV, the international certification body, for the EN 15267-3 standard, which is more recent and more stringent than the existing German Type Approval and QAL1 certificate, EN14181. This means that the Gasmet CEMS is approved for additional calibration ranges and an increased H2O range up to 40%.
Highlighting the importance of this certificate, Gasmet’s Antti Heikkilä says “The ranges for CO, NO, SO2, H2O have been increased and this certificate demonstrates the low, fully compliant, measurement uncertainties that we can achieve. This is a good indicator of the high quality of the analyser, but it
also offers practical advantages. For example, the low measurement uncertainties for N2O and CO2 (5% of measuring range or less) mean that the CEMS system can now be used to monitor Greenhouse gases for emissions trading in addition to measuring pollutants for compliance monitoring purposes.”
The TÜV certificate confirms that, following rigorous QAL1 testing, the Gasmet CEMS fully complies with EN15267-1:2009, EN15267-2:2009, EN15267-
3:2009 and EN14181:2004. Covering CO, NO, NO2, N2O, SO2, HCl, HF, NH3, CO2, H2O and O2, the certificate confirms the additional calibration ranges for which the Gasmet CEMS is now approved. Gasmet’s corresponding MCERTS certificate will be updated accordingly in the near future.
Reader Reply Card No. Weather Data Critical to Pollution Monitoring
We all know that accurate, relevant data is important to making the best management decisions possible. The quality of that data is even more relevant when monitoring sensitive sites, or trying to ensure increasingly stringent environmental licence conditions are met.
Questions such as; When do we need to be careful of emissions drift and put management strategies into place? How much rain have we had, will there be overflow or leachate issues to deal with? What were the evaporation rates last week? Your site will almost certainly experience weather conditions that will be quite different from what the weather bureau records. You will have your own micro-climate, with unique wind movement, rainfall, temperature and evaporation rates. With on site conditions that can vary wildly from the official reports, collecting on-site weather data is becoming increasingly important.
Why Do Over 18 Metrology Institutes Worldwide
Use Tiger as a Transfer Standard? AET 17.1
So how do you collect accurate, relevant and reliable weather data for your site? The answer is to install your own Environdata (Australia) automatic weather station, to keep historical records, provide live data on demand, provide the information you need to be confident in the management decisions you make, with accurate records to back you up.
Not all weather stations are created equal. With an Environdata weather station - a true professional station - you will receive the quality you deserve, PLUS 10 years free phone and email support, high quality windows software, full system integration capability, quality backup, service and advice.
Reader Reply Card No. 113 112 111
Analyser for Sulphur Compounds
Chromatotec (France) offers a wide range of complete solutions for gas analysis and especially for sulphur analysis. Since 1986, Chromatotec’s strength is precise and resistant systems such as the TRS MEDOR analyser.
The TRS MEDOR analyser is an automatic and isothermal gas
chromatograph dedicated to sulphur compounds analysis (H2S, SO2, DMS, DMDS, Me-SH, Et-SH, TRS (Total Reduced Sulphur), odour calculation …), in different matrices. It is able to give accurate results in 5 min and MODBUS communication protocol offers the opportunity to program threshold alarms.
Following the ASTM method for natural gas analysis, our range of measurement varies from ppb to ppm.
Other possible uses are for waste water plants or for emissions analysis.
This product is also available with CSA international: Class 1, Div 2, Group C&D, T3 explosive proof cabinet option.
Reader Reply Card No. Reader Reply Card No. 114 AET Annual Buyers’ Guide 2013
www.envirotech-online.com 115
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