[{"data":1,"prerenderedAt":1247},["ShallowReactive",2],{"site-footer-common":3,"glossary:infrasonic-cleaner":45,"glossary-related:infrasonic-cleaner":286},{"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":262,"description":263,"extension":264,"meta":265,"navigation":266,"path":267,"relatedTerms":268,"seo":274,"sources":277,"stem":284,"term":47,"__hash__":285},"glossary\u002Fglossary\u002Finfrasonic-cleaner.md","Infrasonic cleaner",[49,50,51],"infrasound cleaner","infrasonic cleaning system","sub-audible acoustic cleaner",{"type":53,"value":54,"toc":254},"minimark",[55,79,84,186,190,210,214,222,226],[56,57,58,59,63,64,67,68,73,74,78],"p",{},"An ",[60,61,62],"strong",{},"infrasonic cleaner"," (also written ",[65,66,49],"em",{},") is an ",[69,70,72],"a",{"href":71},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," that operates below the threshold of human hearing — typically 12 to 30 Hz, against the 60–400 Hz range of a conventional ",[69,75,77],{"href":76},"\u002Fglossary\u002Fsonic-horn","sonic horn",". The very long wavelength of an infrasonic wave (above 10 metres at 30 Hz) fills a large vessel almost uniformly and penetrates further into deep, baffled or obstructed cavities than higher-frequency horns can reach.",[80,81,83],"h2",{"id":82},"how-it-differs-from-a-sonic-horn","How it differs from a sonic horn",[85,86,87,102],"table",{},[88,89,90],"thead",{},[91,92,93,97,99],"tr",{},[94,95,96],"th",{},"Attribute",[94,98,47],{},[94,100,101],{},"Sonic horn",[103,104,105,117,128,139,150,161],"tbody",{},[91,106,107,111,114],{},[108,109,110],"td",{},"Frequency",[108,112,113],{},"12–30 Hz (sub-audible)",[108,115,116],{},"60–400 Hz (audible)",[91,118,119,122,125],{},[108,120,121],{},"Wavelength",[108,123,124],{},"10–28 m",[108,126,127],{},"0.85–5.7 m",[91,129,130,133,136],{},[108,131,132],{},"Penetration",[108,134,135],{},"Excellent, fills the whole vessel",[108,137,138],{},"Directional, projected from the bell",[91,140,141,144,147],{},[108,142,143],{},"Audible noise at the work area",[108,145,146],{},"Very low (mostly inaudible)",[108,148,149],{},"Significant, often requires hearing protection",[91,151,152,155,158],{},[108,153,154],{},"Bell size",[108,156,157],{},"Large (low cut-off frequency demands physical bulk)",[108,159,160],{},"Compact",[91,162,163,166,183],{},[108,164,165],{},"Typical applications",[108,167,168,172,173,177,178,182],{},[69,169,171],{"href":170},"\u002Fglossary\u002Frecovery-boiler","Recovery boilers",", ",[69,174,176],{"href":175},"\u002Fglossary\u002Fwaste-to-energy","WtE"," flue paths, ",[69,179,181],{"href":180},"\u002Fglossary\u002Fheat-recovery-steam-generator","HRSGs",", marine boilers",[108,184,185],{},"Cross-application; default specification",[80,187,189],{"id":188},"where-infrasonic-cleaners-are-preferred","Where infrasonic cleaners are preferred",[56,191,192,193,196,197,201,202,205,206,209],{},"Infrasonic technology was popularised by Swedish suppliers (Infrafone \u002F Heat Management) on pulp-and-paper ",[69,194,195],{"href":170},"kraft recovery boilers",", where the combination of deep superheater cavities and the strict need to extend the interval between ",[69,198,200],{"href":199},"\u002Fglossary\u002Fchill-and-blow","chill-and-blow"," wash cycles rewards the deeper penetration of long waves. The same logic carries over to large ",[69,203,204],{"href":175},"WtE boilers"," with sticky chloride-laden ash, to ",[69,207,208],{"href":180},"HRSG harp tube banks"," and to large marine boilers where work-area noise must be kept low.",[80,211,213],{"id":212},"when-to-choose-a-sonic-horn-instead","When to choose a sonic horn instead",[56,215,216,217,221],{},"For most baghouse, ESP, hopper and silo applications, a 60–250 Hz ",[69,218,220],{"href":219},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency sonic horn"," projects enough penetration with a smaller bell, lower capital cost, lower air consumption and simpler integration. Infrasonic cleaners earn their cost where vessel geometry, deposit depth or noise-exposure limits make the long wavelength specifically valuable.",[80,223,225],{"id":224},"related-terms","Related terms",[227,228,229,235,239,244,249],"ul",{},[230,231,232],"li",{},[69,233,234],{"href":71},"Acoustic cleaner",[230,236,237],{},[69,238,101],{"href":76},[230,240,241],{},[69,242,243],{"href":219},"Low-frequency acoustic cleaner",[230,245,246],{},[69,247,248],{"href":170},"Recovery boiler",[230,250,251],{},[69,252,253],{"href":175},"Waste-to-energy",{"title":255,"searchDepth":256,"depth":256,"links":257},"",2,[258,259,260,261],{"id":82,"depth":256,"text":83},{"id":188,"depth":256,"text":189},{"id":212,"depth":256,"text":213},{"id":224,"depth":256,"text":225},"core-technology","An infrasonic cleaner (also written infrasound cleaner) is an acoustic cleaner that operates below the threshold of human hearing — typically 12 to 30 Hz, against the 60–400 Hz range of a conventional sonic horn. The very long wavelength of an infrasonic wave (above 10 metres at 30 Hz) fills a large vessel almost uniformly and penetrates further into deep, baffled or obstructed cavities than higher-frequency horns can reach.","md",{},true,"\u002Fglossary\u002Finfrasonic-cleaner",[269,270,271,272,273],"acoustic-cleaner","sonic-horn","low-frequency-acoustic-cleaner","recovery-boiler","waste-to-energy",{"title":275,"description":276},"Infrasonic cleaner — sub-20 Hz acoustic cleaning for deep penetration","An infrasonic cleaner operates below the audible threshold (typically 12–30 Hz). The very long wavelength penetrates further than a conventional sonic horn and is preferred on recovery boilers and WtE flue paths.",[278,281],{"title":279,"url":280},"Heat Management — Infrasound Cleaning for Boiler Efficiency","https:\u002F\u002Fheatmanage.com\u002Fknowledge\u002Funlocking-infrasound-cleaning-data-for-boiler-efficiency\u002F",{"title":282,"url":283},"Power Magazine — The Theory and Application of Acoustic Cleaners","https:\u002F\u002Fwww.powermag.com\u002Fthe-theory-and-application-of-acoustic-cleaners\u002F","glossary\u002Finfrasonic-cleaner","Oqfo1uKF8ioWxXKH687wPi188BqvEoa3EWC_w2jXmG4",[287,464,675,867,1050],{"id":288,"title":234,"aliases":289,"body":292,"category":262,"description":444,"extension":264,"meta":445,"navigation":266,"path":71,"relatedTerms":446,"seo":451,"sources":454,"stem":462,"term":234,"__hash__":463},"glossary\u002Fglossary\u002Facoustic-cleaner.md",[290,291],"acoustic cleaners","acoustic cleaning device",{"type":53,"value":293,"toc":438},[294,299,303,306,310,313,398,402,414,416],[56,295,58,296,298],{},[60,297,72],{}," is any device that uses high-intensity sound waves — typically at audible low frequencies between 60 and 450 Hz and sound pressure levels of 140 to 180 dB — to dislodge particulate fouling from inside industrial process equipment. The acoustic energy vibrates dust, ash, soot and other accreted solids, keeping them airborne and entrained in the gas flow so they cannot bond, bridge or harden on internal surfaces.",[80,300,302],{"id":301},"how-an-acoustic-cleaner-works","How an acoustic cleaner works",[56,304,305],{},"A pneumatic driver — usually compressed air at 4 to 7 bar — sets a metal diaphragm or piston-whistle assembly vibrating at the cleaner's design frequency. The vibration is amplified through an exponential bell horn and projected into the equipment as a near-spherical pressure field. Particulate already deposited on tube banks, plates, catalyst layers or hopper walls receives an oscillating force that overcomes adhesion. Because the cleaner is non-contact, it can run while the plant is online, every few minutes, without thermal shock, tube erosion or refractory damage.",[80,307,309],{"id":308},"where-acoustic-cleaners-are-used","Where acoustic cleaners are used",[56,311,312],{},"Acoustic cleaners are installed throughout the gas path and bulk-solids path of heavy industry:",[227,314,315,333,351,370,387],{},[230,316,317,320,321,172,325,172,329],{},[60,318,319],{},"Combustion plant"," — boilers, ",[69,322,324],{"href":323},"\u002Fglossary\u002Feconomiser","economisers",[69,326,328],{"href":327},"\u002Fglossary\u002Fsuperheater","superheaters",[69,330,332],{"href":331},"\u002Fglossary\u002Fair-heater","air heaters",[230,334,335,338,339,172,343,172,347],{},[60,336,337],{},"Air-pollution control"," — ",[69,340,342],{"href":341},"\u002Fglossary\u002Felectrostatic-precipitator","electrostatic precipitators",[69,344,346],{"href":345},"\u002Fglossary\u002Ffabric-filter","fabric filters",[69,348,350],{"href":349},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[230,352,353,338,356,360,361,365,366],{},[60,354,355],{},"Bulk solids",[69,357,359],{"href":358},"\u002Fglossary\u002Fhopper","hoppers, silos and bunkers"," prone to ",[69,362,364],{"href":363},"\u002Fglossary\u002Fbridging","bridging"," and ",[69,367,369],{"href":368},"\u002Fglossary\u002Frat-holing","rat-holing",[230,371,372,338,375,172,379,172,383],{},[60,373,374],{},"Cement",[69,376,378],{"href":377},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[69,380,382],{"href":381},"\u002Fglossary\u002Fcalciner","calciners",[69,384,386],{"href":385},"\u002Fglossary\u002Fkiln-inlet-riser-duct","kiln inlets",[230,388,389,338,392,172,394],{},[60,390,391],{},"Pulp and paper",[69,393,195],{"href":170},[69,395,397],{"href":396},"\u002Fglossary\u002Flime-kiln","lime kilns",[80,399,401],{"id":400},"acoustic-cleaners-are-not-ultrasonic-cleaners","Acoustic cleaners are not ultrasonic cleaners",[56,403,404,405,408,409,413],{},"The two terms are routinely confused but describe completely different technologies. Acoustic cleaners operate in the audible low-frequency band and clean dry industrial surfaces ",[65,406,407],{},"in situ"," with airborne sound. Ultrasonic cleaners operate above 20 kHz inside a liquid bath and clean small parts off-line by cavitation. See ",[69,410,412],{"href":411},"\u002Fglossary\u002Facoustic-cleaning-vs-ultrasonic-cleaning","acoustic cleaning vs ultrasonic cleaning",".",[80,415,225],{"id":224},[227,417,418,424,428,434],{},[230,419,420],{},[69,421,423],{"href":422},"\u002Fglossary\u002Facoustic-cleaning-system","Acoustic cleaning system",[230,425,426],{},[69,427,101],{"href":76},[230,429,430],{},[69,431,433],{"href":432},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[230,435,436],{},[69,437,47],{"href":267},{"title":255,"searchDepth":256,"depth":256,"links":439},[440,441,442,443],{"id":301,"depth":256,"text":302},{"id":308,"depth":256,"text":309},{"id":400,"depth":256,"text":401},{"id":224,"depth":256,"text":225},"An acoustic cleaner is any device that uses high-intensity sound waves — typically at audible low frequencies between 60 and 450 Hz and sound pressure levels of 140 to 180 dB — to dislodge particulate fouling from inside industrial process equipment. The acoustic energy vibrates dust, ash, soot and other accreted solids, keeping them airborne and entrained in the gas flow so they cannot bond, bridge or harden on internal surfaces.",{},[447,270,448,449,271,450],"acoustic-cleaning-system","sonic-sootblower","infrasonic-cleaner","high-frequency-acoustic-cleaner",{"title":452,"description":453},"Acoustic cleaner — definition, principle, industrial uses","An acoustic cleaner is any device that uses high-intensity sound waves to dislodge particulate fouling from inside industrial process equipment such as boilers, ESPs, baghouses and silos.",[455,456,459],{"title":282,"url":283},{"title":457,"url":458},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":460,"url":461},"Wikipedia — Acoustic cleaning","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAcoustic_cleaning","glossary\u002Facoustic-cleaner","MwPOKb4JllxnhygiJ3--SHn7B_zEw8BdkQXIXUCoV0E",{"id":465,"title":101,"aliases":466,"body":470,"category":262,"description":657,"extension":264,"meta":658,"navigation":266,"path":76,"relatedTerms":659,"seo":662,"sources":665,"stem":673,"term":101,"__hash__":674},"glossary\u002Fglossary\u002Fsonic-horn.md",[467,468,469],"sonic horns","sonic cleaning horn","industrial sonic horn",{"type":53,"value":471,"toc":650},[472,495,499,507,511,573,577,610,614,622,624],[56,473,474,475,477,478,480,481,172,484,172,487,172,489,365,492,413],{},"A ",[60,476,77],{}," 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 ",[69,479,72],{"href":71}," and the default specification for cleaning ",[69,482,483],{"href":341},"ESPs",[69,485,486],{"href":345},"baghouses",[69,488,350],{"href":349},[69,490,491],{"href":327},"boiler heat-transfer surfaces",[69,493,494],{"href":358},"hoppers and silos",[80,496,498],{"id":497},"how-a-sonic-horn-works","How a sonic horn works",[56,500,501,502,506],{},"Compressed plant air admitted through a ",[69,503,505],{"href":504},"\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.",[80,508,510],{"id":509},"key-parameters","Key parameters",[85,512,513,523],{},[88,514,515],{},[91,516,517,520],{},[94,518,519],{},"Parameter",[94,521,522],{},"Typical range",[103,524,525,533,541,549,557,565],{},[91,526,527,530],{},[108,528,529],{},"Fundamental frequency",[108,531,532],{},"60–400 Hz",[91,534,535,538],{},[108,536,537],{},"Sound pressure level",[108,539,540],{},"140–180 dB",[91,542,543,546],{},[108,544,545],{},"Compressed-air consumption",[108,547,548],{},"8–14 Nm³\u002Fmin at 4–7 bar",[91,550,551,554],{},[108,552,553],{},"Operating temperature (with appropriate materials)",[108,555,556],{},"−40 °C to +500 °C",[91,558,559,562],{},[108,560,561],{},"Firing cycle",[108,563,564],{},"5–15 s burst, repeated every 3–15 minutes",[91,566,567,570],{},[108,568,569],{},"Mass",[108,571,572],{},"15–60 kg depending on horn size",[80,574,576],{"id":575},"frequency-selection","Frequency selection",[56,578,579,580,172,582,585,586,172,590,594,595,172,598,602,603,365,606,413],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[69,581,378],{"href":377},[69,583,584],{"href":170},"recovery-boiler superheaters",", large ",[69,587,589],{"href":588},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[69,591,593],{"href":592},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[69,596,597],{"href":345},"fabric-filter compartments",[69,599,601],{"href":600},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[69,604,605],{"href":219},"low-frequency acoustic cleaner",[69,607,609],{"href":608},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[80,611,613],{"id":612},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[56,615,616,617,621],{},"Sonic horns are increasingly specified alongside or in place of ",[69,618,620],{"href":619},"\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.",[80,623,225],{"id":224},[227,625,626,630,634,640,646],{},[230,627,628],{},[69,629,234],{"href":71},[230,631,632],{},[69,633,433],{"href":432},[230,635,636],{},[69,637,639],{"href":638},"\u002Fglossary\u002Fbell-horn","Bell horn",[230,641,642],{},[69,643,645],{"href":644},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[230,647,648],{},[69,649,243],{"href":219},{"title":255,"searchDepth":256,"depth":256,"links":651},[652,653,654,655,656],{"id":497,"depth":256,"text":498},{"id":509,"depth":256,"text":510},{"id":575,"depth":256,"text":576},{"id":612,"depth":256,"text":613},{"id":224,"depth":256,"text":225},"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.",{},[269,447,448,660,661,271],"bell-horn","diaphragm-horn",{"title":663,"description":664},"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.",[666,669,670],{"title":667,"url":668},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":457,"url":458},{"title":671,"url":672},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",{"id":676,"title":243,"aliases":677,"body":681,"category":262,"description":856,"extension":264,"meta":857,"navigation":266,"path":219,"relatedTerms":858,"seo":859,"sources":862,"stem":865,"term":243,"__hash__":866},"glossary\u002Fglossary\u002Flow-frequency-acoustic-cleaner.md",[678,679,680],"low frequency sonic horn","low-frequency horn","LF acoustic cleaner",{"type":53,"value":682,"toc":850},[683,695,699,705,708,760,764,825,827],[56,684,474,685,687,688,690,691,694],{},[60,686,605],{}," is an industrial ",[69,689,77],{"href":76}," whose fundamental frequency sits in the 60–250 Hz band. The long acoustic wavelength — between 1.4 and 5.7 metres in air — projects further from the ",[69,692,693],{"href":638},"bell horn"," than higher-frequency designs, fills large open vessels more uniformly and is the default choice for cleaning bulky industrial equipment.",[80,696,698],{"id":697},"why-frequency-choice-matters","Why frequency choice matters",[56,700,701,702,704],{},"Acoustic energy at long wavelengths diffracts around obstructions (tube banks, electrode rows, baffles) instead of being absorbed or scattered. That makes low-frequency horns the appropriate selection where the cleaning target is several metres deep and partly obstructed — most large industrial vessels fall into this category. Higher-frequency horns concentrate more energy per unit volume but lose effectiveness in deep cavities; see ",[69,703,609],{"href":608}," for the complementary case.",[80,706,165],{"id":707},"typical-applications",[227,709,710,716,724,735,741,754],{},[230,711,712,715],{},[69,713,714],{"href":341},"Electrostatic precipitators"," — collecting-plate cleaning, hopper de-bridging",[230,717,718,365,721,723],{},[69,719,720],{"href":377},"Preheater cyclones",[69,722,382],{"href":381}," in cement plants",[230,725,726,729,730,734],{},[69,727,728],{"href":170},"Kraft recovery boilers"," — superheaters, ",[69,731,733],{"href":732},"\u002Fglossary\u002Fgenerating-bank","generating banks",", economisers",[230,736,737,740],{},[69,738,739],{"href":331},"Air heater"," cold-end basket cleaning",[230,742,743,744,172,748,365,750],{},"Large ",[69,745,747],{"href":746},"\u002Fglossary\u002Ffly-ash-hopper","fly-ash hoppers",[69,749,593],{"href":592},[69,751,753],{"href":752},"\u002Fglossary\u002Fbunker-coal-bunker","bunkers",[230,755,756,759],{},[69,757,758],{"href":180},"HRSG harp-tube banks"," in combined-cycle plants",[80,761,763],{"id":762},"indicative-selection-bands","Indicative selection bands",[85,765,766,779],{},[88,767,768],{},[91,769,770,773,776],{},[94,771,772],{},"Band",[94,774,775],{},"Wavelength in air at 20 °C",[94,777,778],{},"Typical use",[103,780,781,792,803,814],{},[91,782,783,786,789],{},[108,784,785],{},"60 Hz",[108,787,788],{},"~5.7 m",[108,790,791],{},"Very large ESPs, recovery boilers, deep silos",[91,793,794,797,800],{},[108,795,796],{},"75 Hz",[108,798,799],{},"~4.6 m",[108,801,802],{},"ESPs, preheater cyclones, large hoppers",[91,804,805,808,811],{},[108,806,807],{},"125 Hz",[108,809,810],{},"~2.7 m",[108,812,813],{},"Mid-size ESPs, baghouse compartments, calciners",[91,815,816,819,822],{},[108,817,818],{},"230 Hz",[108,820,821],{},"~1.5 m",[108,823,824],{},"Boiler convective passes, smaller hoppers, baghouses",[80,826,225],{"id":224},[227,828,829,833,837,842,846],{},[230,830,831],{},[69,832,101],{"href":76},[230,834,835],{},[69,836,234],{"href":71},[230,838,839],{},[69,840,841],{"href":608},"High-frequency acoustic cleaner",[230,843,844],{},[69,845,47],{"href":267},[230,847,848],{},[69,849,639],{"href":638},{"title":255,"searchDepth":256,"depth":256,"links":851},[852,853,854,855],{"id":697,"depth":256,"text":698},{"id":707,"depth":256,"text":165},{"id":762,"depth":256,"text":763},{"id":224,"depth":256,"text":225},"A low-frequency acoustic cleaner is an industrial sonic horn whose fundamental frequency sits in the 60–250 Hz band. The long acoustic wavelength — between 1.4 and 5.7 metres in air — projects further from the bell horn than higher-frequency designs, fills large open vessels more uniformly and is the default choice for cleaning bulky industrial equipment.",{},[269,270,450,449,660],{"title":860,"description":861},"Low-frequency acoustic cleaner — 60–250 Hz horn selection guide","Low-frequency acoustic cleaners operate at 60–250 Hz. The long wavelength penetrates deep into large open vessels such as ESPs, recovery boilers and cement preheater cyclones.",[863,864],{"title":667,"url":668},{"title":457,"url":458},"glossary\u002Flow-frequency-acoustic-cleaner","m6cj771ScgiY0798OZ0cdR03A65ardaL1YsF3e8jwFM",{"id":868,"title":248,"aliases":869,"body":873,"category":1032,"description":1033,"extension":264,"meta":1034,"navigation":266,"path":170,"relatedTerms":1035,"seo":1038,"sources":1041,"stem":1048,"term":248,"__hash__":1049},"glossary\u002Fglossary\u002Frecovery-boiler.md",[870,871,872],"kraft recovery boiler","black-liquor recovery boiler","BLRB",{"type":53,"value":874,"toc":1026},[875,889,893,899,929,939,943,972,976,984,986],[56,876,474,877,880,881,172,883,885,886,888],{},[60,878,879],{},"recovery boiler"," (also ",[65,882,870],{},[65,884,871],{},", or ",[65,887,872],{},") is a unique industrial boiler at the centre of every kraft pulp mill. It burns concentrated black liquor — the spent cooking-chemicals stream — to generate steam, electrical power and to recover the sodium and sulphur compounds that re-enter the pulping cycle as smelt. Recovery boilers are large, complex, expensive and irreplaceable to mill operation.",[80,890,892],{"id":891},"the-iconic-sonic-horn-application","The iconic sonic-horn application",[56,894,895,896,898],{},"Recovery boilers are the iconic application for ",[69,897,467],{"href":76},". Three features combine to make them so:",[227,900,901,914,923],{},[230,902,903,906,907,365,910,913],{},[60,904,905],{},"Sticky, alkali-rich ash"," — sodium-sulphate carry-over deposits aggressively on ",[69,908,909],{"href":327},"superheater",[69,911,912],{"href":732},"generating-bank"," tubes",[230,915,916,919,920,922],{},[60,917,918],{},"Long-run-time targets"," — mills target 12–18 months between ",[69,921,200],{"href":199}," wash cycles, and every extra week of run time is worth tens of thousands of dollars",[230,924,925,928],{},[60,926,927],{},"Deep cavities"," — the superheater bundles are tall and bafflingly inaccessible to short-throw cleaning",[56,930,931,932,934,935,938],{},"Both conventional ",[69,933,467],{"href":76}," at 60–125 Hz and ",[69,936,937],{"href":267},"infrasonic cleaners"," below 30 Hz are deployed on recovery boilers. Major OEM aftermarket teams (ANDRITZ, Valmet, Babcock & Wilcox Vølund) all integrate acoustic cleaning into their service portfolios.",[80,940,942],{"id":941},"other-applications-inside-the-recovery-island","Other applications inside the recovery island",[227,944,945,951,957,966],{},[230,946,947,950],{},[60,948,949],{},"ESP hoppers"," — sodium-rich fly-ash bridging",[230,952,953,956],{},[60,954,955],{},"Economiser pluggage"," — salt-cake build-up on tube bundles",[230,958,959,962,963],{},[60,960,961],{},"Lime kiln preheater"," — see ",[69,964,965],{"href":396},"lime kiln",[230,967,968,971],{},[60,969,970],{},"Smelt dissolving tank"," vent stack — sodium-fume build-up",[80,973,975],{"id":974},"safety","Safety",[56,977,978,979,983],{},"Recovery-boiler operations are governed by ",[69,980,982],{"href":981},"\u002Fglossary\u002Fblrbac","BLRBAC"," Recommended Good Practices. Any cleaning intervention — including acoustic — is reviewed against BLRBAC water-side-incident and emergency-shutdown protocols.",[80,985,225],{"id":224},[227,987,988,994,999,1004,1009,1014,1018,1022],{},[230,989,990],{},[69,991,993],{"href":992},"\u002Fglossary\u002Fboiler","Boiler",[230,995,996],{},[69,997,998],{"href":732},"Generating bank",[230,1000,1001],{},[69,1002,1003],{"href":327},"Superheater",[230,1005,1006],{},[69,1007,1008],{"href":323},"Economiser",[230,1010,1011],{},[69,1012,1013],{"href":199},"Chill-and-blow",[230,1015,1016],{},[69,1017,982],{"href":981},[230,1019,1020],{},[69,1021,101],{"href":76},[230,1023,1024],{},[69,1025,47],{"href":267},{"title":255,"searchDepth":256,"depth":256,"links":1027},[1028,1029,1030,1031],{"id":891,"depth":256,"text":892},{"id":941,"depth":256,"text":942},{"id":974,"depth":256,"text":975},{"id":224,"depth":256,"text":225},"boiler","A recovery boiler (also kraft recovery boiler, black-liquor recovery boiler, or BLRB) is a unique industrial boiler at the centre of every kraft pulp mill. It burns concentrated black liquor — the spent cooking-chemicals stream — to generate steam, electrical power and to recover the sodium and sulphur compounds that re-enter the pulping cycle as smelt. Recovery boilers are large, complex, expensive and irreplaceable to mill operation.",{},[1032,912,909,1036,200,1037,270,449],"economiser","blrbac",{"title":1039,"description":1040},"Recovery boiler — kraft pulp mill steam-and-chemicals plant","A recovery boiler burns kraft black liquor to generate steam, electrical power and recovered pulping chemicals. Iconic application for sonic horns on superheater cleaning.",[1042,1045],{"title":1043,"url":1044},"Wikipedia — Recovery boiler","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FRecovery_boiler",{"title":1046,"url":1047},"BLRBAC — Recovery Boilers in Service","https:\u002F\u002Fblrbac.net\u002Frecovery-boilers-in-service\u002F","glossary\u002Frecovery-boiler","mXzBGZ7hSMEgl58wabmRAArKMR06mHldZvB1HJLRt0g",{"id":1051,"title":1052,"aliases":1053,"body":1057,"category":1227,"description":1228,"extension":264,"meta":1229,"navigation":266,"path":175,"relatedTerms":1230,"seo":1235,"sources":1238,"stem":1245,"term":253,"__hash__":1246},"glossary\u002Fglossary\u002Fwaste-to-energy.md","Waste-to-energy (WtE \u002F EfW)",[176,1054,1055,1056],"EfW","energy-from-waste","MSW incineration",{"type":53,"value":1058,"toc":1222},[1059,1081,1107,1111,1114,1143,1155,1159,1193,1195],[56,1060,1061,1064,1065,1068,1069,172,1073,1077,1078,1080],{},[60,1062,1063],{},"Waste-to-energy (WtE)"," — equivalently ",[65,1066,1067],{},"energy-from-waste (EfW)"," — burns ",[69,1070,1072],{"href":1071},"\u002Fglossary\u002Fmunicipal-solid-waste","municipal solid waste (MSW)",[69,1074,1076],{"href":1075},"\u002Fglossary\u002Frdf-srf-tdf","RDF, SRF and TDF",", commercial waste and some industrial waste streams to generate steam and electricity. WtE is the fastest-growing application for industrial ",[69,1079,467],{"href":76}," worldwide, driven by:",[227,1082,1083,1089,1095,1101],{},[230,1084,1085,1088],{},[60,1086,1087],{},"EU policy"," — landfill diversion targets, EU ETS extension to WtE from 2028",[230,1090,1091,1094],{},[60,1092,1093],{},"UK"," — recent tightening of criteria for new WtE plants raises operating-efficiency expectations",[230,1096,1097,1100],{},[60,1098,1099],{},"EPC pipeline"," — major projects from Hitachi Zosen Inova \u002F Kanadevia Inova, Babcock & Wilcox Vølund, Paprec Énergies, Keppel Seghers, ANDRITZ, Valmet",[230,1102,1103,1106],{},[60,1104,1105],{},"Operator economics"," — tipping fees underwrite high-availability targets",[80,1108,1110],{"id":1109},"why-wte-is-uniquely-fouling-prone","Why WtE is uniquely fouling-prone",[56,1112,1113],{},"Three converging factors make WtE boilers harder to clean than conventional fossil-fuel plants:",[227,1115,1116,1127,1137],{},[230,1117,1118,1121,1122,1126],{},[60,1119,1120],{},"High chlorine content"," in waste fuels → ",[69,1123,1125],{"href":1124},"\u002Fglossary\u002Fchloride-induced-corrosion","chloride corrosion"," and sticky deposits",[230,1128,1129,1132,1133],{},[60,1130,1131],{},"High alkali content"," (Na, K from food, paper, biomass fractions) → ",[69,1134,1136],{"href":1135},"\u002Fglossary\u002Flow-melt-sticky-ash","low-melt sticky ash",[230,1138,1139,1142],{},[60,1140,1141],{},"Variable fuel composition"," → unpredictable fouling intensity",[56,1144,1145,1146,1149,1150,1154],{},"Conventional steam ",[69,1147,1148],{"href":619},"sootblowing"," accelerates ",[69,1151,1153],{"href":1152},"\u002Fglossary\u002Ftube-erosion-tube-wastage","tube wastage"," on the chloride-rich, low-melt deposits typical of WtE; acoustic cleaning is the safer alternative.",[80,1156,1158],{"id":1157},"where-sonic-horns-sit-in-wte-plants","Where sonic horns sit in WtE plants",[227,1160,1161,1167,1177,1183,1188],{},[230,1162,1163,1166],{},[60,1164,1165],{},"Boiler convective pass"," — superheater, evaporator, economiser tube banks",[230,1168,1169,1172,1173,1176],{},[60,1170,1171],{},"SCR catalyst layers"," — high-dust ",[69,1174,1175],{"href":349},"SCR"," on WtE",[230,1178,1179,1182],{},[60,1180,1181],{},"Flue-gas ducting"," between boiler and treatment train",[230,1184,1185],{},[60,1186,1187],{},"Bag-filter compartments and hoppers",[230,1189,1190],{},[60,1191,1192],{},"Bottom-ash and fly-ash hoppers",[80,1194,225],{"id":224},[227,1196,1197,1202,1207,1213,1218],{},[230,1198,1199],{},[69,1200,1201],{"href":1071},"Municipal solid waste (MSW)",[230,1203,1204],{},[69,1205,1206],{"href":1075},"RDF \u002F SRF \u002F TDF",[230,1208,1209],{},[69,1210,1212],{"href":1211},"\u002Fglossary\u002Fgrate-fired-boiler-mass-burn-incinerator","Grate-fired boiler \u002F mass-burn incinerator",[230,1214,1215],{},[69,1216,1217],{"href":1124},"Chloride-induced corrosion",[230,1219,1220],{},[69,1221,101],{"href":76},{"title":255,"searchDepth":256,"depth":256,"links":1223},[1224,1225,1226],{"id":1109,"depth":256,"text":1110},{"id":1157,"depth":256,"text":1158},{"id":224,"depth":256,"text":225},"wte-biomass","Waste-to-energy (WtE) — equivalently energy-from-waste (EfW) — burns municipal solid waste (MSW), RDF, SRF and TDF, commercial waste and some industrial waste streams to generate steam and electricity. WtE is the fastest-growing application for industrial sonic horns worldwide, driven by:",{},[1231,1232,1233,1234,270],"municipal-solid-waste","rdf-srf-tdf","grate-fired-boiler-mass-burn-incinerator","chloride-induced-corrosion",{"title":1236,"description":1237},"Waste-to-energy (WtE \u002F EfW) — fastest-growing sonic-horn market","WtE plants burn municipal solid waste, RDF, SRF and biomass to generate steam and electricity. Sticky chloride-rich ash defeats conventional cleaning; sonic horns are the dominant fit.",[1239,1242],{"title":1240,"url":1241},"Wikipedia — Waste-to-energy","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FWaste-to-energy",{"title":1243,"url":1244},"ESWET — UK tightens criteria for new waste-to-energy plants","https:\u002F\u002Feswet.eu\u002Fuk-government-tightens-criteria-for-new-waste-to-energy-plants\u002F","glossary\u002Fwaste-to-energy","n1jacm4CfEzWzKgFtb3zWUtawVRCvFMnoypq0mxk6h8",1782613733356]