Air Monitoring


An appropriate particulate monitor fitted in the duct downstream of the filter plant can monitor the pulses of dust created by the cleaning process and discriminate this from the filter plant’s particulate emission during routine operation. Consequently, the dust profile monitored by such an instrument includes periodic dust pulses resulting from the bag cleaning sequence. The magnitude of these dust peaks reflects the condition of the filter media being cleaned, with a failing or worn media generating a higher dust pulse emission peak than those operating efficiently. The cleaning pulse peaks present in the emission profile can be used to indicate the relative condition of the different rows of filter media and, therefore, isolate which row is failing ahead of catastrophic failure. Instruments designed to locate filter leaks can display this pulse profile on a graphical display and connected to the digital controller for the filtration plant’s cleaning cycle so that the row being cleaned can be identified and marked alongside the appropriate dust peak.


Filtration plants that operate with periodic sequential cleaning cycles, require only the input pulse from the first row of the cleaning sequence, as the sequence of bag row cleaning is predictable and can be programmed into the instrument. Filtration plants that operate more complex cleaning sequences (eg clean on demand), require a connection to be made between the filter plant and the particulate sensor control unit for each row of filter media.


Using these techniques, failing bag rows can be easily identified but also the general condition of the filter plant can be compared over time and facilitate early warning of deteriorating operation and thus assist preventative maintenance.


Filter media leak location functionality can also be provided by PC software connected to appropriate particulate monitors. This enables maintenance staff to monitor the condition of filtration plant in a central location and efficiently monitor multiple filters simultaneously.


Filter Leak Monitors


Instruments are used for monitoring changes in emissions from particulate arrestment plant (e.g. Electrofilters or Bagfilters) and provide a tool to minimise emissions from processes and monitor for arrestment plant malfunction (eg. leaking or failing filtration media).


•Approved Filter Leak Monitors (e.g. to MCERTS Class 3 requirements or TA Luft) where quality assurance features are required in addition to reliable measurement. Performance standard is similar to the ASTM standard D7392-07 for bag leak detectors which has relevance for MACT monitoring in the US.


•Filter Leak Monitors which are not certified to any performance standard but still provide a variety of quality assurance and functionality options


Filter Performance Monitors


In addition to providing leak monitoring capability for filtration-type arrestment plant, these more advanced instruments have the capability of monitoring the dynamic operation of the filter cleaning system and to diagnose the location of faulty media rows and compartments. Valuable information is therefore provided for maintenance teams in solving leakage problems and thus reducing bag replacements costs.


•Functionality is often combined with particulate measurement systems or may be added via a separate control unit to filter leak sensors hence permitting approved versions of these instruments


•In large multi-compartment bag compartments, multi-sensor systems are used to monitor emissions from each compartment to diagnose the location of failed compartments


Filter Performance Monitor: LEAK LOCATE 660


33


The benefits of leak location and failed filter media row identification are threefold:


•Leaking filter media are rapidly identified ahead of gross failure so that they may be replaced on a proactive and necessity basis only.


•Only faulty or leaking media need be replaced and thus those performing satisfactorily can be left in situ and their lifespan continued, when previously all filter media, regardless of condition, was replaced in a single event


•Following filter media replacement, a check can be made that all are properly fitted without seal problems.


To assist Plant Operators with the identification and selection of the appropriate level of Particulate Emission Monitor for their specific requirement, PCME have introduced product categories which reflect instrument monitoring capabilities: Filter Leak Monitors and Filter Performance Monitors. It is, therefore, much easier for a Plant Operator or Regulator to see which product category a specific instrument is intended to serve.


Automation with PC software


In conclusion, operational costs of filtration-type arrestment plant can be reduced by the installation of particulate emission monitors. By providing assistance in the identification of leaking bag rows before large scale emissions occur, diagnostic timescales and filter media replacement costs are decreased.


AUTHOR DETAILS


William Averdieck, MD Linda Furnell,


MarComs Manager PCME Ltd


Clearview Building, 60 Edison Road, St Ives,Cambs PE27 3GH, UK Tel: +44 (0) 1480 468200 Fax: +44 (0) 1480 463400 Email:


williama@pcme.co.uk lindaf@pcme.co.uk Web: www.pcme.co.uk


Filter Leak Monitor: LEAK ALERT 73


If you would like to have your products featured in Asia’s leading Environmental Magazine, contact us today.


info@aet-pub.com EN Approval for Gas Analyser Series


Ecotech (Australia) is pleased to announce EN approval for its Serinus gas analyser range. According to Ecotech's General Manager, Nicholas Dal Sasso, "The approvals are a vital step in Ecotech's expansion within Europe and provides the European community with a greater choice of ambient gas analysers". Nicholas went on to say "We are confident that the Serinus will give our European customers the performance they need, with Ecotech's proven reliability, along with enhanced data transfer and communication."


The Serinus series includes the following, Model Parameter, MCERTS certificate # EN standard, Serinus 10, Ozone


(O3), Sira MC 100165/00, EN14625, Serinus 30, Carbon Monoxide (CO), Sira MC 100166/00, EN14626 Serinus 40, Oxides of Nitrogen (NOx) , Sira MC 100167/00, EN14211, Serinus 50, Sulphur Dioxide (SO2), Sira MC 100168/00,EN14212.


The Serinus gas analyser series are utilised in many different applications including air quality monitoring stations, roadside monitoring, EPA networks and research organizations. Further specialist models will be progressively released.


The Serinus series ambient gas analyser derives its name from the genus (group) of the canary, which was the first effective 'method' used to detect harmful gases in coalmines. Just as the humble canary helped protect the health of early coal miners, so too will the new Serinus gas analysers play their part in helping deliver a cleaner, safer, healthier global environment.


Reader Reply Card no 120


Looking for world-class particulate emission monitoring?


We’re right at the top.


To give you everything you need to measure particulate


emissions in the most demanding of stack monitoring applications.


Hot, cold, humid, dry, large and small


stacks, all backed up by market-leading insight and industry expertise.


So if you are looking for the best, look


no further. We’re right up there with you. Find out more: www.pcme.co.uk


Particulate Measurement Systems


Filter Performance Monitors


Reader Reply Card no 121 April/May 2010 AET


Filter Leak Monitors


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44