[{"data":1,"prerenderedAt":564},["ShallowReactive",2],{"site-footer-common":3,"glossary:en-14181-en-13284":45,"glossary-related:en-14181-en-13284":150},{"id":4,"extension":5,"footer":6,"meta":40,"navbar":41,"stem":43,"__hash__":44},"common\u002Fcommon.yml","yml",{"tagline":7,"links":8,"sections":9},"Acoustic cleaning intelligence for industrial fouling, soot, ash, dust and build-up.",[],[10,19,31],{"title":11,"links":12},"Product",[13,16],{"label":14,"to":15},"How it works","\u002F#product",{"label":17,"to":18},"Cost assessment","\u002F#hero",{"title":20,"links":21},"Company",[22,25,28],{"label":23,"to":24},"What we build","\u002F#about",{"label":26,"to":27},"Careers","\u002F#careers",{"label":29,"to":30},"Contact","\u002F#contact",{"title":32,"links":33},"Resources",[34,37],{"label":35,"to":36},"Blog","\u002Fresources\u002Fblog",{"label":38,"to":39},"Glossary","\u002Fglossary",{},{"links":42},[],"common","YocmZRy1AYfBbpgGVms-zhdiABlF8VTxHx6h4rDmZBA",{"id":46,"title":47,"aliases":48,"body":52,"category":131,"description":132,"extension":133,"meta":134,"navigation":135,"path":136,"relatedTerms":137,"seo":140,"sources":143,"stem":147,"term":148,"__hash__":149},"glossary\u002Fglossary\u002Fen-14181-en-13284.md","EN 14181 \u002F EN 13284 (CEMS \u002F particulate)",[49,50,51],"EN 14181","EN 13284","CEMS QAL",{"type":53,"value":54,"toc":125},"minimark",[55,65,70,73,89,103,107],[56,57,58,61,62,64],"p",{},[59,60,49],"strong",{}," sets the European quality-assurance levels (QAL1, QAL2, QAL3 and AST) for continuous emissions monitoring systems (CEMS) installed on stationary industrial sources. ",[59,63,50],{}," covers manual reference methods for low-range particulate determination — typically used as the reference method against which the CEMS is calibrated.",[66,67,69],"h2",{"id":68},"why-they-matter-operationally","Why they matter operationally",[56,71,72],{},"Industrial operators in the EU must:",[74,75,76,80,83,86],"ul",{},[77,78,79],"li",{},"Install QAL1-certified CEMS instruments",[77,81,82],{},"Perform QAL2 site calibration against EN 13284 reference measurements",[77,84,85],{},"Conduct QAL3 daily drift checks",[77,87,88],{},"Schedule AST (Annual Surveillance Test) once a year",[56,90,91,92,97,98,102],{},"Performance of upstream particulate-control equipment (",[93,94,96],"a",{"href":95},"\u002Fglossary\u002Felectrostatic-precipitator","ESP",", ",[93,99,101],{"href":100},"\u002Fglossary\u002Fbaghouse","baghouse",") shows up in the CEMS trace. Any drift in collection efficiency from fouling immediately appears as a rising particulate signal — making the case for active cleaning visible to operators in near-real-time.",[66,104,106],{"id":105},"related-terms","Related terms",[74,108,109,115,120],{},[77,110,111],{},[93,112,114],{"href":113},"\u002Fglossary\u002Fopacity","Opacity",[77,116,117],{},[93,118,119],{"href":95},"Electrostatic precipitator",[77,121,122],{},[93,123,124],{"href":100},"Baghouse",{"title":126,"searchDepth":127,"depth":127,"links":128},"",2,[129,130],{"id":68,"depth":127,"text":69},{"id":105,"depth":127,"text":106},"standards-regulations","EN 14181 sets the European quality-assurance levels (QAL1, QAL2, QAL3 and AST) for continuous emissions monitoring systems (CEMS) installed on stationary industrial sources. EN 13284 covers manual reference methods for low-range particulate determination — typically used as the reference method against which the CEMS is calibrated.","md",{},true,"\u002Fglossary\u002Fen-14181-en-13284",[138,139,101],"opacity","electrostatic-precipitator",{"title":141,"description":142},"EN 14181 and EN 13284 — European CEMS quality assurance and low-range particulate measurement","EN 14181 sets European quality-assurance levels for stationary-source CEMS. EN 13284 covers manual reference methods for low-range particulate determination.",[144],{"title":145,"url":146},"BSI — EN 14181","https:\u002F\u002Fwww.bsigroup.com\u002F","glossary\u002Fen-14181-en-13284","EN 14181 and EN 13284","SepvnkFack-r-g5FVkzJgSsXBq5N8GNtYbmMPShcTy0",[151,261,439],{"id":152,"title":114,"aliases":153,"body":156,"category":245,"description":246,"extension":133,"meta":247,"navigation":135,"path":113,"relatedTerms":248,"seo":251,"sources":254,"stem":258,"term":259,"__hash__":260},"glossary\u002Fglossary\u002Fopacity.md",[154,155],"stack opacity","opacity excursion",{"type":53,"value":157,"toc":240},[158,166,170,173,205,209,216,218],[56,159,160,162,163,165],{},[59,161,114],{}," is the percentage of light obscured by particulate matter in stack flue gas, measured continuously by a transmissometer (opacity monitor) installed in the stack. Opacity is the headline visual KPI for ",[93,164,96],{"href":95}," performance and is permit-limited in most jurisdictions — typically 20–40% on a 6-minute rolling average, with absolute peaks limited to 60% for shorter periods.",[66,167,169],{"id":168},"opacity-excursions","Opacity excursions",[56,171,172],{},"Opacity excursions are typically driven by:",[74,174,175,187,192,199,202],{},[77,176,177,181,182,186],{},[93,178,180],{"href":179},"\u002Fglossary\u002Fesp-rapper","ESP rapping"," ",[93,183,185],{"href":184},"\u002Fglossary\u002Fre-entrainment","re-entrainment"," puffs",[77,188,189,191],{},[93,190,124],{"href":100}," bag failure (sudden particulate breakthrough)",[77,193,194,198],{},[93,195,197],{"href":196},"\u002Fglossary\u002Fback-corona","ESP back-corona"," collapse",[77,200,201],{},"Combustion upsets producing unusually high inlet particulate",[77,203,204],{},"Soot-blower-triggered re-entrainment",[66,206,208],{"id":207},"how-sonic-horns-reduce-opacity","How sonic horns reduce opacity",[56,210,211,215],{},[93,212,214],{"href":213},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," deliver continuous gentle dust release rather than periodic aggressive rapping puffs. Plants retrofitting horns on opacity-limited ESPs commonly see 20–40% opacity-peak reduction without other changes — the headline business case for many sonic-horn ESP installations.",[66,217,106],{"id":105},[74,219,220,226,230,235],{},[77,221,222],{},[93,223,225],{"href":224},"\u002Fglossary\u002Fcems","CEMS",[77,227,228],{},[93,229,119],{"href":95},[77,231,232],{},[93,233,234],{"href":184},"Re-entrainment",[77,236,237],{},[93,238,239],{"href":213},"Sonic horn",{"title":126,"searchDepth":127,"depth":127,"links":241},[242,243,244],{"id":168,"depth":127,"text":169},{"id":207,"depth":127,"text":208},{"id":105,"depth":127,"text":106},"kpis-measurements","Opacity is the percentage of light obscured by particulate matter in stack flue gas, measured continuously by a transmissometer (opacity monitor) installed in the stack. Opacity is the headline visual KPI for ESP performance and is permit-limited in most jurisdictions — typically 20–40% on a 6-minute rolling average, with absolute peaks limited to 60% for shorter periods.",{},[249,139,185,250],"cems","sonic-horn",{"title":252,"description":253},"Opacity — visual stack-emission KPI measured by continuous monitor","Opacity is the percentage of light obscured by particulate in stack flue gas. The headline visual KPI for ESP performance; continuously monitored and permit-limited.",[255],{"title":256,"url":257},"Wikipedia — Opacity","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FOpacity_(optics)","glossary\u002Fopacity","Opacity (stack)","-4RIuJbd3zg7kip6GHWTZ5efGSK8D9bOiK_nb9oMGWo",{"id":262,"title":263,"aliases":264,"body":267,"category":414,"description":415,"extension":133,"meta":416,"navigation":135,"path":95,"relatedTerms":417,"seo":424,"sources":427,"stem":437,"term":119,"__hash__":438},"glossary\u002Fglossary\u002Felectrostatic-precipitator.md","Electrostatic precipitator (ESP)",[96,265,266],"electrostatic precipitators","dry ESP",{"type":53,"value":268,"toc":408},[269,285,289,307,311,345,349,380,382],[56,270,271,272,275,276,280,281,284],{},"An ",[59,273,274],{},"electrostatic precipitator (ESP)"," is an air-pollution-control device that removes particulate matter from a flue-gas stream by electrostatically charging dust particles and collecting them on grounded plate electrodes. ESPs are the dominant particulate-control technology on coal-fired boilers, cement kilns, ",[93,277,279],{"href":278},"\u002Fglossary\u002Fwaste-to-energy","waste-to-energy"," plants, ",[93,282,283],{"href":278},"biomass"," plants, sinter strands and many other heavy-industry off-gas streams.",[66,286,288],{"id":287},"how-an-esp-works","How an ESP works",[56,290,291,292,296,297,301,302,306],{},"Flue gas flows horizontally between a parallel array of vertical ",[93,293,295],{"href":294},"\u002Fglossary\u002Fcollecting-electrode","collecting electrodes"," (plates) and ",[93,298,300],{"href":299},"\u002Fglossary\u002Fdischarge-electrode","discharge electrodes"," (high-voltage wires or rigid spikes). A negative DC potential of 40–80 kV applied to the discharge electrodes generates a ",[93,303,305],{"href":304},"\u002Fglossary\u002Fcorona-discharge","corona discharge"," that ionises the gas. Charged dust particles drift to the collecting plates, accumulate as a dust layer, are rapped down into hoppers below and removed by ash-handling equipment.",[66,308,310],{"id":309},"where-sonic-horns-fit","Where sonic horns fit",[56,312,313,314,318,319,321,322,326,327,330,331,334,335,339,340,344],{},"ESPs accumulate dust faster than mechanical rapping can release it, and hoppers below ESP fields routinely ",[93,315,317],{"href":316},"\u002Fglossary\u002Fbridging","bridge"," and choke. ",[93,320,214],{"href":213}," installed on the ESP ",[93,323,325],{"href":324},"\u002Fglossary\u002Fesp-penthouse","penthouse"," and on hopper walls keep dust dislodged, supplement ",[93,328,329],{"href":179},"rappers",", prevent ",[93,332,333],{"href":196},"back-corona"," by limiting plate dust thickness, and eliminate hopper ",[93,336,338],{"href":337},"\u002Fglossary\u002Frat-holing","rat-holing"," without the structural fatigue of ",[93,341,343],{"href":342},"\u002Fglossary\u002Ftumbling-hammer-rapper","tumbling-hammer rappers",".",[66,346,348],{"id":347},"common-failure-modes","Common failure modes",[74,350,351,357,363,368,374],{},[77,352,353,356],{},[59,354,355],{},"High opacity \u002F particulate emissions"," from thick dust layers reducing collection efficiency",[77,358,359,362],{},[59,360,361],{},"Back-corona"," in high-resistivity ash that reverses ionisation and collapses collection",[77,364,365,367],{},[59,366,234],{}," as rapper puffs return dust to the gas stream",[77,369,370,373],{},[59,371,372],{},"Hopper bridging"," that stops ash extraction and triggers field shutdowns",[77,375,376,379],{},[59,377,378],{},"Discharge-electrode breakage"," from rapper fatigue or sparking",[66,381,106],{"id":105},[74,383,384,389,394,398,404],{},[77,385,386],{},[93,387,388],{"href":294},"Collecting electrode",[77,390,391],{},[93,392,393],{"href":299},"Discharge electrode",[77,395,396],{},[93,397,361],{"href":196},[77,399,400],{},[93,401,403],{"href":402},"\u002Fglossary\u002Fesp-hopper","ESP hopper",[77,405,406],{},[93,407,239],{"href":213},{"title":126,"searchDepth":127,"depth":127,"links":409},[410,411,412,413],{"id":287,"depth":127,"text":288},{"id":309,"depth":127,"text":310},{"id":347,"depth":127,"text":348},{"id":105,"depth":127,"text":106},"esp","An electrostatic precipitator (ESP) is an air-pollution-control device that removes particulate matter from a flue-gas stream by electrostatically charging dust particles and collecting them on grounded plate electrodes. ESPs are the dominant particulate-control technology on coal-fired boilers, cement kilns, waste-to-energy plants, biomass plants, sinter strands and many other heavy-industry off-gas streams.",{},[418,419,420,421,422,423,333,250],"wet-esp","collecting-electrode","discharge-electrode","corona-discharge","esp-hopper","esp-rapper",{"title":425,"description":426},"Electrostatic precipitator (ESP) — how it works and how it fouls","An ESP removes particulate from flue gas by charging dust and collecting it on plate electrodes. Sonic horns are widely used to dislodge ash from plates and to keep hoppers from bridging.",[428,431,434],{"title":429,"url":430},"Wikipedia — Electrostatic precipitator","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FElectrostatic_precipitator",{"title":432,"url":433},"EPA — Monitoring Knowledge Base: Electrostatic Precipitators","https:\u002F\u002Fwww.epa.gov\u002Fair-emissions-monitoring-knowledge-base\u002Fmonitoring-control-technique-electrostatic-precipitators",{"title":435,"url":436},"Babcock & Wilcox — Basics of ESP Operation","https:\u002F\u002Fwww.babcock.com\u002Fhome\u002Fabout\u002Fresources\u002Flearning-center\u002Fbasic-esp-operation","glossary\u002Felectrostatic-precipitator","hT_C4hmid3iZaYWhLpiSJ2tBfL0bSJ-uhzn7TY4Vtj4",{"id":440,"title":124,"aliases":441,"body":445,"category":101,"description":548,"extension":133,"meta":549,"navigation":135,"path":100,"relatedTerms":550,"seo":555,"sources":558,"stem":562,"term":124,"__hash__":563},"glossary\u002Fglossary\u002Fbaghouse.md",[442,443,444],"baghouses","bag filter house","dust collector house",{"type":53,"value":446,"toc":543},[447,467,471,483,487,490,507,509],[56,448,449,450,452,453,97,457,461,462,466],{},"A ",[59,451,101],{}," is the structural enclosure that houses the bags, cages, cleaning system, ",[93,454,456],{"href":455},"\u002Fglossary\u002Ftubesheet","tubesheet",[93,458,460],{"href":459},"\u002Fglossary\u002Fplenum-clean-side-dirty-side","plenums"," and hoppers of a ",[93,463,465],{"href":464},"\u002Fglossary\u002Ffabric-filter","fabric-filter"," dust collector. The word is used in both broad (\"the plant has a 12-compartment baghouse\") and narrow (\"a baghouse is the housing, the fabric filter is the system\") senses; in everyday industry practice the two terms overlap.",[66,468,470],{"id":469},"compartmented-design","Compartmented design",[56,472,473,474,478,479,482],{},"Large industrial baghouses are subdivided into several compartments — each with its own gas-flow damper — so that one compartment can be isolated for offline cleaning or bag replacement while the rest stay online. The standard ",[93,475,477],{"href":476},"\u002Fglossary\u002Fpulse-jet-baghouse","pulse-jet"," compartment count for utility duty is 8–16; cement and ",[93,480,481],{"href":278},"WtE"," baghouses may run 20+.",[66,484,486],{"id":485},"why-sonic-horns-help","Why sonic horns help",[56,488,489],{},"Sonic horns mounted at compartment level address fouling that the primary cleaning system (pulse-jet, reverse-air or shaker) cannot reach:",[74,491,492,495,501,504],{},[77,493,494],{},"Bag-row dead zones at the back of the compartment",[77,496,497,500],{},[93,498,499],{"href":455},"Tubesheet"," area dust deposits",[77,502,503],{},"Hopper bridging below the bags",[77,505,506],{},"Inlet-plenum dust dropout",[66,508,106],{"id":105},[74,510,511,516,521,527,533,539],{},[77,512,513],{},[93,514,515],{"href":464},"Fabric filter",[77,517,518],{},[93,519,520],{"href":476},"Pulse-jet baghouse",[77,522,523],{},[93,524,526],{"href":525},"\u002Fglossary\u002Freverse-air-baghouse","Reverse-air baghouse",[77,528,529],{},[93,530,532],{"href":531},"\u002Fglossary\u002Fshaker-baghouse","Shaker baghouse",[77,534,535],{},[93,536,538],{"href":537},"\u002Fglossary\u002Fcompartment-isolation","Compartment isolation",[77,540,541],{},[93,542,239],{"href":213},{"title":126,"searchDepth":127,"depth":127,"links":544},[545,546,547],{"id":469,"depth":127,"text":470},{"id":485,"depth":127,"text":486},{"id":105,"depth":127,"text":106},"A baghouse is the structural enclosure that houses the bags, cages, cleaning system, tubesheet, plenums and hoppers of a fabric-filter dust collector. The word is used in both broad (\"the plant has a 12-compartment baghouse\") and narrow (\"a baghouse is the housing, the fabric filter is the system\") senses; in everyday industry practice the two terms overlap.",{},[465,551,552,553,554,250],"pulse-jet-baghouse","reverse-air-baghouse","shaker-baghouse","compartment-isolation",{"title":556,"description":557},"Baghouse — vessel that houses fabric-filter bags for industrial dust control","A baghouse is the structural enclosure that holds the bags, cages, tubesheet, cleaning system and hoppers of a fabric-filter dust collector. Sized in compartments for online isolation.",[559],{"title":560,"url":561},"Wikipedia — Baghouse","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBaghouse","glossary\u002Fbaghouse","TraeRQp5lNGOrkFkwjsoYRrhIIRrMkFonwryXyc1wGw",1782613754488]