[{"data":1,"prerenderedAt":781},["ShallowReactive",2],{"site-footer-common":3,"glossary:wet-esp":45,"glossary-related:wet-esp":161},{"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":140,"description":141,"extension":142,"meta":143,"navigation":144,"path":145,"relatedTerms":146,"seo":151,"sources":154,"stem":158,"term":159,"__hash__":160},"glossary\u002Fglossary\u002Fwet-esp.md","Wet ESP (WESP)",[49,50,51],"WESP","wet electrostatic precipitator","wet ESPs",{"type":53,"value":54,"toc":133},"minimark",[55,79,84,87,91,103,107],[56,57,58,59,63,64,69,70,73,74,78],"p",{},"A ",[60,61,62],"strong",{},"wet electrostatic precipitator (WESP)"," is an ",[65,66,68],"a",{"href":67},"\u002Fglossary\u002Felectrostatic-precipitator","ESP"," in which the collecting surfaces are continuously washed with water rather than rapped dry. WESPs are specified where the particulate is sub-micron, sticky, hygroscopic or acidic — typically downstream of ",[65,71,72],{"href":67},"FGD scrubbers",", on ",[65,75,77],{"href":76},"\u002Fglossary\u002Fwaste-to-energy","biomass"," and waste-to-energy plants, in coke-oven flue paths and on certain refinery and metals off-gas streams.",[80,81,83],"h2",{"id":82},"tube-type-vs-plate-type-wesps","Tube-type vs plate-type WESPs",[56,85,86],{},"Most WESPs are tube-type, with vertical cylindrical collectors and a coaxial discharge electrode in each tube. Plate-type WESPs also exist for retrofit duty into existing dry-ESP shells. Water sluicing is either continuous, intermittent flushing, or condensate-driven.",[80,88,90],{"id":89},"where-sonic-horns-help","Where sonic horns help",[56,92,93,94,97,98,102],{},"The wash-water film usually keeps the collecting surfaces clean, but solids accumulate in the ",[60,95,96],{},"sumps and dust-handling hoppers below the WESP",". ",[65,99,101],{"href":100},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," prevent sludge bridging and pluggage in these low-level hoppers and pipework, where conventional rapping is impractical and manual cleaning is hazardous.",[80,104,106],{"id":105},"related-terms","Related terms",[108,109,110,116,122,128],"ul",{},[111,112,113],"li",{},[65,114,115],{"href":67},"Electrostatic precipitator",[111,117,118],{},[65,119,121],{"href":120},"\u002Fglossary\u002Fplate-type-esp-tube-type-esp","Plate-type ESP \u002F tube-type ESP",[111,123,124],{},[65,125,127],{"href":126},"\u002Fglossary\u002Fcorona-discharge","Corona discharge",[111,129,130],{},[65,131,132],{"href":100},"Sonic horn",{"title":134,"searchDepth":135,"depth":135,"links":136},"",2,[137,138,139],{"id":82,"depth":135,"text":83},{"id":89,"depth":135,"text":90},{"id":105,"depth":135,"text":106},"esp","A wet electrostatic precipitator (WESP) is an ESP in which the collecting surfaces are continuously washed with water rather than rapped dry. WESPs are specified where the particulate is sub-micron, sticky, hygroscopic or acidic — typically downstream of FGD scrubbers, on biomass and waste-to-energy plants, in coke-oven flue paths and on certain refinery and metals off-gas streams.","md",{},true,"\u002Fglossary\u002Fwet-esp",[147,148,149,150],"electrostatic-precipitator","plate-type-esp-tube-type-esp","corona-discharge","sonic-horn",{"title":152,"description":153},"Wet ESP (WESP) — definition, applications and cleaning issues","A wet electrostatic precipitator continuously washes its collecting surfaces with water, used for sub-micron particulate, acid mist and sticky aerosols downstream of FGD or biomass scrubbers.",[155],{"title":156,"url":157},"Wikipedia — Electrostatic precipitator","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FElectrostatic_precipitator","glossary\u002Fwet-esp","Wet electrostatic precipitator","y9WXPV9UgI-euyX7Gvtpd4HQjiXQ-8yMrDGvpZkJcgM",[162,336,437,543],{"id":163,"title":164,"aliases":165,"body":168,"category":140,"description":315,"extension":142,"meta":316,"navigation":144,"path":67,"relatedTerms":317,"seo":323,"sources":326,"stem":334,"term":115,"__hash__":335},"glossary\u002Fglossary\u002Felectrostatic-precipitator.md","Electrostatic precipitator (ESP)",[68,166,167],"electrostatic precipitators","dry ESP",{"type":53,"value":169,"toc":309},[170,184,188,205,209,245,249,281,283],[56,171,172,173,176,177,180,181,183],{},"An ",[60,174,175],{},"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, ",[65,178,179],{"href":76},"waste-to-energy"," plants, ",[65,182,77],{"href":76}," plants, sinter strands and many other heavy-industry off-gas streams.",[80,185,187],{"id":186},"how-an-esp-works","How an ESP works",[56,189,190,191,195,196,200,201,204],{},"Flue gas flows horizontally between a parallel array of vertical ",[65,192,194],{"href":193},"\u002Fglossary\u002Fcollecting-electrode","collecting electrodes"," (plates) and ",[65,197,199],{"href":198},"\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 ",[65,202,203],{"href":126},"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.",[80,206,208],{"id":207},"where-sonic-horns-fit","Where sonic horns fit",[56,210,211,212,216,217,219,220,224,225,229,230,234,235,239,240,244],{},"ESPs accumulate dust faster than mechanical rapping can release it, and hoppers below ESP fields routinely ",[65,213,215],{"href":214},"\u002Fglossary\u002Fbridging","bridge"," and choke. ",[65,218,101],{"href":100}," installed on the ESP ",[65,221,223],{"href":222},"\u002Fglossary\u002Fesp-penthouse","penthouse"," and on hopper walls keep dust dislodged, supplement ",[65,226,228],{"href":227},"\u002Fglossary\u002Fesp-rapper","rappers",", prevent ",[65,231,233],{"href":232},"\u002Fglossary\u002Fback-corona","back-corona"," by limiting plate dust thickness, and eliminate hopper ",[65,236,238],{"href":237},"\u002Fglossary\u002Frat-holing","rat-holing"," without the structural fatigue of ",[65,241,243],{"href":242},"\u002Fglossary\u002Ftumbling-hammer-rapper","tumbling-hammer rappers",".",[80,246,248],{"id":247},"common-failure-modes","Common failure modes",[108,250,251,257,263,269,275],{},[111,252,253,256],{},[60,254,255],{},"High opacity \u002F particulate emissions"," from thick dust layers reducing collection efficiency",[111,258,259,262],{},[60,260,261],{},"Back-corona"," in high-resistivity ash that reverses ionisation and collapses collection",[111,264,265,268],{},[60,266,267],{},"Re-entrainment"," as rapper puffs return dust to the gas stream",[111,270,271,274],{},[60,272,273],{},"Hopper bridging"," that stops ash extraction and triggers field shutdowns",[111,276,277,280],{},[60,278,279],{},"Discharge-electrode breakage"," from rapper fatigue or sparking",[80,282,106],{"id":105},[108,284,285,290,295,299,305],{},[111,286,287],{},[65,288,289],{"href":193},"Collecting electrode",[111,291,292],{},[65,293,294],{"href":198},"Discharge electrode",[111,296,297],{},[65,298,261],{"href":232},[111,300,301],{},[65,302,304],{"href":303},"\u002Fglossary\u002Fesp-hopper","ESP hopper",[111,306,307],{},[65,308,132],{"href":100},{"title":134,"searchDepth":135,"depth":135,"links":310},[311,312,313,314],{"id":186,"depth":135,"text":187},{"id":207,"depth":135,"text":208},{"id":247,"depth":135,"text":248},{"id":105,"depth":135,"text":106},"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.",{},[318,319,320,149,321,322,233,150],"wet-esp","collecting-electrode","discharge-electrode","esp-hopper","esp-rapper",{"title":324,"description":325},"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.",[327,328,331],{"title":156,"url":157},{"title":329,"url":330},"EPA — Monitoring Knowledge Base: Electrostatic Precipitators","https:\u002F\u002Fwww.epa.gov\u002Fair-emissions-monitoring-knowledge-base\u002Fmonitoring-control-technique-electrostatic-precipitators",{"title":332,"url":333},"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":337,"title":121,"aliases":338,"body":341,"category":140,"description":426,"extension":142,"meta":427,"navigation":144,"path":120,"relatedTerms":428,"seo":429,"sources":432,"stem":434,"term":435,"__hash__":436},"glossary\u002Fglossary\u002Fplate-type-esp-tube-type-esp.md",[339,340],"plate type ESP","tube type ESP",{"type":53,"value":342,"toc":420},[343,356,360,377,381,388,392,400,402],[56,344,345,348,349,352,353,244],{},[60,346,347],{},"Plate-type"," and ",[60,350,351],{},"tube-type"," describe the two principal collecting-electrode geometries of an ",[65,354,355],{"href":67},"electrostatic precipitator",[80,357,359],{"id":358},"plate-type-esps","Plate-type ESPs",[56,361,362,363,366,367,369,370,373,374,244],{},"Plate-type ESPs have vertical parallel ",[65,364,365],{"href":193},"collecting plates"," spaced 250–400 mm apart, with ",[65,368,199],{"href":198}," hanging in the gas-flow lanes between them. They dominate dry ESP installations on coal-fired boilers, cement kilns, ",[65,371,372],{"href":76},"WtE",", biomass and sinter plants. Gas flows horizontally; cleaning is by rapping or ",[65,375,376],{"href":100},"sonic horns",[80,378,380],{"id":379},"tube-type-esps","Tube-type ESPs",[56,382,383,384,387],{},"Tube-type ESPs use vertical cylindrical collecting tubes with a single discharge electrode along the axis of each tube. Gas flows vertically. The geometry is preferred for ",[65,385,386],{"href":145},"wet ESPs (WESPs)",", acid-mist scrubbing and small specialised duties.",[80,389,391],{"id":390},"cleaning-differences","Cleaning differences",[56,393,394,395,399],{},"Plate-type fields benefit from ",[65,396,398],{"href":397},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency sonic horns"," projecting along the gas-flow direction to dislodge dust across multiple plate rows. Tube-type fields use water in WESP service; their dry equivalent is uncommon outside specialised metallurgical and chemical applications.",[80,401,106],{"id":105},[108,403,404,408,412,416],{},[111,405,406],{},[65,407,115],{"href":67},[111,409,410],{},[65,411,47],{"href":145},[111,413,414],{},[65,415,289],{"href":193},[111,417,418],{},[65,419,294],{"href":198},{"title":134,"searchDepth":135,"depth":135,"links":421},[422,423,424,425],{"id":358,"depth":135,"text":359},{"id":379,"depth":135,"text":380},{"id":390,"depth":135,"text":391},{"id":105,"depth":135,"text":106},"Plate-type and tube-type describe the two principal collecting-electrode geometries of an electrostatic precipitator.",{},[147,318,319,320],{"title":430,"description":431},"Plate-type vs tube-type ESPs — geometry and typical applications","Plate-type ESPs use vertical parallel collecting plates with discharge wires between rows. Tube-type ESPs use cylindrical collectors with a coaxial discharge electrode, common in WESPs.",[433],{"title":156,"url":157},"glossary\u002Fplate-type-esp-tube-type-esp","Plate-type and tube-type ESPs","aMtH8QjbAHVkfQqemXvWKKIn7b-_cYhl_GePU1hyoAs",{"id":438,"title":127,"aliases":439,"body":442,"category":140,"description":531,"extension":142,"meta":532,"navigation":144,"path":126,"relatedTerms":533,"seo":534,"sources":537,"stem":541,"term":127,"__hash__":542},"glossary\u002Fglossary\u002Fcorona-discharge.md",[440,441],"corona (electrical)","negative corona",{"type":53,"value":443,"toc":526},[444,459,463,466,470,502,505,507],[56,445,58,446,448,449,451,452,455,456,458],{},[60,447,203],{}," is a self-sustaining electrical discharge that occurs when the field gradient around a sharp electrode exceeds the breakdown threshold of the surrounding gas. In an ",[65,450,68],{"href":67}," the corona forms around the ",[65,453,454],{"href":198},"discharge electrode",", ionises flue-gas molecules, and the resulting ions attach to dust particles. The charged particles then drift to the ",[65,457,194],{"href":193}," under the electric field.",[80,460,462],{"id":461},"negative-corona-dominates","Negative corona dominates",[56,464,465],{},"Industrial ESPs almost always run on negative corona because it sustains a higher voltage before sparking — but it also produces some ozone, which is one of the reasons WESPs in confined ventilation paths sometimes use positive corona instead.",[80,467,469],{"id":468},"what-disrupts-the-corona","What disrupts the corona",[108,471,472,478,490,496],{},[111,473,474,477],{},[60,475,476],{},"Excessive dust on the collecting plate"," — raises plate-face voltage, narrows the working gap",[111,479,480,487,488],{},[60,481,482,483],{},"High ash ",[65,484,486],{"href":485},"\u002Fglossary\u002Fresistivity","resistivity"," — traps charge in the dust layer, leading to ",[65,489,233],{"href":232},[111,491,492,495],{},[60,493,494],{},"Bent or broken discharge electrodes"," — local field collapse, sparking, eventual short",[111,497,498,501],{},[60,499,500],{},"Fouled discharge electrode tips"," — suppressed corona, reduced ion current",[56,503,504],{},"Acoustic cleaning addresses two of these (plate dust thickness and discharge-electrode fouling) without the broken-electrode risk of aggressive mechanical rapping.",[80,506,106],{"id":105},[108,508,509,513,517,521],{},[111,510,511],{},[65,512,115],{"href":67},[111,514,515],{},[65,516,294],{"href":198},[111,518,519],{},[65,520,261],{"href":232},[111,522,523],{},[65,524,525],{"href":485},"Resistivity (fly-ash)",{"title":134,"searchDepth":135,"depth":135,"links":527},[528,529,530],{"id":461,"depth":135,"text":462},{"id":468,"depth":135,"text":469},{"id":105,"depth":135,"text":106},"A corona discharge is a self-sustaining electrical discharge that occurs when the field gradient around a sharp electrode exceeds the breakdown threshold of the surrounding gas. In an ESP the corona forms around the discharge electrode, ionises flue-gas molecules, and the resulting ions attach to dust particles. The charged particles then drift to the collecting electrodes under the electric field.",{},[147,320,233,486],{"title":535,"description":536},"Corona discharge — the ionisation mechanism that powers an ESP","Corona discharge is the electrical breakdown around an ESP's discharge electrode that ionises gas molecules and charges dust particles for collection.",[538],{"title":539,"url":540},"Wikipedia — Corona discharge","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FCorona_discharge","glossary\u002Fcorona-discharge","dShpP0lym_kkFMbohrkUgv75_uA0O8qlKu9VJ1eimyA",{"id":544,"title":132,"aliases":545,"body":548,"category":756,"description":757,"extension":142,"meta":758,"navigation":144,"path":100,"relatedTerms":759,"seo":766,"sources":769,"stem":779,"term":132,"__hash__":780},"glossary\u002Fglossary\u002Fsonic-horn.md",[376,546,547],"sonic cleaning horn","industrial sonic horn",{"type":53,"value":549,"toc":749},[550,581,585,593,597,665,669,705,709,717,719],[56,551,58,552,555,556,560,561,564,565,564,569,564,573,348,577,244],{},[60,553,554],{},"sonic horn"," is a pneumatically-driven sound emitter that produces high-intensity, low-frequency sound waves — typically between 60 and 400 Hz at sound pressure levels of 140 to 180 dB — used to dislodge particulate fouling from inside industrial process equipment. Sonic horns are the most common form of ",[65,557,559],{"href":558},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[65,562,563],{"href":67},"ESPs",", ",[65,566,568],{"href":567},"\u002Fglossary\u002Ffabric-filter","baghouses",[65,570,572],{"href":571},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[65,574,576],{"href":575},"\u002Fglossary\u002Fsuperheater","boiler heat-transfer surfaces",[65,578,580],{"href":579},"\u002Fglossary\u002Fhopper","hoppers and silos",[80,582,584],{"id":583},"how-a-sonic-horn-works","How a sonic horn works",[56,586,587,588,592],{},"Compressed plant air admitted through a ",[65,589,591],{"href":590},"\u002Fglossary\u002Fsolenoid-valve","solenoid valve"," drives a metal diaphragm — typically titanium or 316 stainless — into resonant oscillation at the horn's fundamental frequency. The oscillating pressure field is amplified by an exponential bell horn and projected into the vessel as a near-spherical sound wave. Particulate already deposited on internal surfaces receives an oscillating acceleration that overcomes adhesion; loosened material is then carried out with the gas flow before it can sinter, bridge or bond. Because the cleaning is acoustic and non-contact, the horn can fire while the plant is online without tube erosion, refractory damage or thermal shock.",[80,594,596],{"id":595},"key-parameters","Key parameters",[598,599,600,613],"table",{},[601,602,603],"thead",{},[604,605,606,610],"tr",{},[607,608,609],"th",{},"Parameter",[607,611,612],{},"Typical range",[614,615,616,625,633,641,649,657],"tbody",{},[604,617,618,622],{},[619,620,621],"td",{},"Fundamental frequency",[619,623,624],{},"60–400 Hz",[604,626,627,630],{},[619,628,629],{},"Sound pressure level",[619,631,632],{},"140–180 dB",[604,634,635,638],{},[619,636,637],{},"Compressed-air consumption",[619,639,640],{},"8–14 Nm³\u002Fmin at 4–7 bar",[604,642,643,646],{},[619,644,645],{},"Operating temperature (with appropriate materials)",[619,647,648],{},"−40 °C to +500 °C",[604,650,651,654],{},[619,652,653],{},"Firing cycle",[619,655,656],{},"5–15 s burst, repeated every 3–15 minutes",[604,658,659,662],{},[619,660,661],{},"Mass",[619,663,664],{},"15–60 kg depending on horn size",[80,666,668],{"id":667},"frequency-selection","Frequency selection",[56,670,671,672,564,676,680,681,564,685,689,690,564,693,697,698,348,701,244],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[65,673,675],{"href":674},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[65,677,679],{"href":678},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters",", large ",[65,682,684],{"href":683},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[65,686,688],{"href":687},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[65,691,692],{"href":567},"fabric-filter compartments",[65,694,696],{"href":695},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[65,699,700],{"href":397},"low-frequency acoustic cleaner",[65,702,704],{"href":703},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[80,706,708],{"id":707},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[56,710,711,712,716],{},"Sonic horns are increasingly specified alongside or in place of ",[65,713,715],{"href":714},"\u002Fglossary\u002Fsteam-sootblower","steam sootblowers"," because they consume no boiler-grade steam, cause no tube erosion, require almost no moving parts and can fire every few minutes without operator intervention. They are less effective on hard, fused slag than retractable steam lances, so on furnace waterwalls and high-temperature superheaters they typically complement rather than replace mechanical cleaning.",[80,718,106],{"id":105},[108,720,721,726,732,738,744],{},[111,722,723],{},[65,724,725],{"href":558},"Acoustic cleaner",[111,727,728],{},[65,729,731],{"href":730},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[111,733,734],{},[65,735,737],{"href":736},"\u002Fglossary\u002Fbell-horn","Bell horn",[111,739,740],{},[65,741,743],{"href":742},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[111,745,746],{},[65,747,748],{"href":397},"Low-frequency acoustic cleaner",{"title":134,"searchDepth":135,"depth":135,"links":750},[751,752,753,754,755],{"id":583,"depth":135,"text":584},{"id":595,"depth":135,"text":596},{"id":667,"depth":135,"text":668},{"id":707,"depth":135,"text":708},{"id":105,"depth":135,"text":106},"core-technology","A sonic horn is a pneumatically-driven sound emitter that produces high-intensity, low-frequency sound waves — typically between 60 and 400 Hz at sound pressure levels of 140 to 180 dB — used to dislodge particulate fouling from inside industrial process equipment. Sonic horns are the most common form of acoustic cleaner and the default specification for cleaning ESPs, baghouses, SCR catalysts, boiler heat-transfer surfaces and hoppers and silos.",{},[760,761,762,763,764,765],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":767,"description":768},"Sonic horn — definition, frequency, SPL and industrial applications","A sonic horn is a pneumatically-driven low-frequency sound emitter (typically 60–400 Hz at 140–180 dB SPL) used to dislodge particulate fouling from boilers, ESPs, baghouses and process vessels.",[770,773,776],{"title":771,"url":772},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":774,"url":775},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":777,"url":778},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613738570]