[{"data":1,"prerenderedAt":1206},["ShallowReactive",2],{"site-footer-common":3,"glossary:high-frequency-acoustic-cleaner":45,"glossary-related:high-frequency-acoustic-cleaner":263},{"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":240,"description":241,"extension":242,"meta":243,"navigation":244,"path":245,"relatedTerms":246,"seo":251,"sources":254,"stem":261,"term":47,"__hash__":262},"glossary\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner.md","High-frequency acoustic cleaner",[49,50,51],"high frequency sonic horn","HF acoustic cleaner","high-frequency horn",{"type":53,"value":54,"toc":231},"minimark",[55,75,80,103,107,151,155,168,172,197,201],[56,57,58,59,63,64,69,70,74],"p",{},"A ",[60,61,62],"strong",{},"high-frequency acoustic cleaner"," is a ",[65,66,68],"a",{"href":67},"\u002Fglossary\u002Fsonic-horn","sonic horn"," operating in the upper end of the audible industrial-cleaning band, typically 250 to 450 Hz. The shorter wavelength — 0.75 to 1.4 metres in air — couples more energy into smaller geometries and finer dust loads than long-wavelength ",[65,71,73],{"href":72},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency horns"," can deliver.",[76,77,79],"h2",{"id":78},"where-high-frequency-horns-earn-their-place","Where high-frequency horns earn their place",[56,81,82,83,87,88,92,93,97,98,102],{},"The cleaning target dictates the choice. Where deposits are fine and surfaces are densely packed — ",[65,84,86],{"href":85},"\u002Fglossary\u002Ffabric-filter","fabric-filter"," bag rows, ",[65,89,91],{"href":90},"\u002Fglossary\u002Fhoneycomb-catalyst","honeycomb SCR catalyst"," cell faces, small ",[65,94,96],{"href":95},"\u002Fglossary\u002Fcyclone-separator","cyclone separators",", tight ",[65,99,101],{"href":100},"\u002Fglossary\u002Fair-heater","air-heater"," basket geometries — the higher energy density of a 250–450 Hz horn lifts particulate more reliably than a long wave that would diffract past it.",[76,104,106],{"id":105},"selection-guide","Selection guide",[108,109,110,123],"table",{},[111,112,113],"thead",{},[114,115,116,120],"tr",{},[117,118,119],"th",{},"Frequency",[117,121,122],{},"Best for",[124,125,126,135,143],"tbody",{},[114,127,128,132],{},[129,130,131],"td",{},"250 Hz",[129,133,134],{},"Mid-size baghouse compartments, smaller boiler convective passes",[114,136,137,140],{},[129,138,139],{},"350 Hz",[129,141,142],{},"SCR catalyst layers, fine-particulate fabric filters",[114,144,145,148],{},[129,146,147],{},"400–450 Hz",[129,149,150],{},"Compact hoppers, fine-cell honeycomb catalysts, small ducting",[76,152,154],{"id":153},"construction-differences-from-low-frequency-horns","Construction differences from low-frequency horns",[56,156,157,158,162,163,167],{},"A higher fundamental frequency means a smaller ",[65,159,161],{"href":160},"\u002Fglossary\u002Fbell-horn","bell horn"," cut-off and therefore a physically smaller, lighter unit — useful where mounting clearance is tight or where a large array of horns must be distributed across a baghouse roof. High-frequency designs are often ",[65,164,166],{"href":165},"\u002Fglossary\u002Fpiston-whistle-horn","piston-whistle"," rather than diaphragm-driven, with a different wear profile and shorter individual firing bursts.",[76,169,171],{"id":170},"when-to-step-down-to-low-frequency","When to step down to low frequency",[56,173,174,175,179,180,179,184,179,188,192,193,196],{},"For deep, open vessels and bulk-solids storage — ",[65,176,178],{"href":177},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",", ",[65,181,183],{"href":182},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[65,185,187],{"href":186},"\u002Fglossary\u002Fsilo","silos",[65,189,191],{"href":190},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters"," — a ",[65,194,195],{"href":72},"low-frequency horn"," projects further and is normally specified instead. Many real installations combine both bands: low-frequency horns clean the bulk volume; high-frequency horns clean the dense bag rows or catalyst faces nearby.",[76,198,200],{"id":199},"related-terms","Related terms",[202,203,204,210,216,221,226],"ul",{},[205,206,207],"li",{},[65,208,209],{"href":67},"Sonic horn",[205,211,212],{},[65,213,215],{"href":214},"\u002Fglossary\u002Facoustic-cleaner","Acoustic cleaner",[205,217,218],{},[65,219,220],{"href":72},"Low-frequency acoustic cleaner",[205,222,223],{},[65,224,225],{"href":165},"Piston-whistle horn",[205,227,228],{},[65,229,230],{"href":85},"Fabric filter",{"title":232,"searchDepth":233,"depth":233,"links":234},"",2,[235,236,237,238,239],{"id":78,"depth":233,"text":79},{"id":105,"depth":233,"text":106},{"id":153,"depth":233,"text":154},{"id":170,"depth":233,"text":171},{"id":199,"depth":233,"text":200},"core-technology","A high-frequency acoustic cleaner is a sonic horn operating in the upper end of the audible industrial-cleaning band, typically 250 to 450 Hz. The shorter wavelength — 0.75 to 1.4 metres in air — couples more energy into smaller geometries and finer dust loads than long-wavelength low-frequency horns can deliver.","md",{},true,"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner",[247,248,249,250,86],"acoustic-cleaner","sonic-horn","low-frequency-acoustic-cleaner","piston-whistle-horn",{"title":252,"description":253},"High-frequency acoustic cleaner — 250–450 Hz horns for fine dust","High-frequency acoustic cleaners operate at 250–450 Hz. The shorter wavelength carries more energy per unit volume and suits fabric filters, SCR catalysts and small hopper geometries.",[255,258],{"title":256,"url":257},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":259,"url":260},"Micronics — Sonic Horns for Baghouses","https:\u002F\u002Fwww.micronicsinc.com\u002Fdry-baghouse-filtration\u002Fparts\u002Fbaghouse-accessories\u002Fsonic-horns\u002F","glossary\u002Fhigh-frequency-acoustic-cleaner","lNIvkPALQGjCAhpfwsyKTlK4g-5X34MBQgtefiuEWTM",[264,444,644,835,1015],{"id":265,"title":215,"aliases":266,"body":269,"category":240,"description":422,"extension":242,"meta":423,"navigation":244,"path":214,"relatedTerms":424,"seo":429,"sources":432,"stem":442,"term":215,"__hash__":443},"glossary\u002Fglossary\u002Facoustic-cleaner.md",[267,268],"acoustic cleaners","acoustic cleaning device",{"type":53,"value":270,"toc":416},[271,278,282,285,289,292,373,377,390,392],[56,272,273,274,277],{},"An ",[60,275,276],{},"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.",[76,279,281],{"id":280},"how-an-acoustic-cleaner-works","How an acoustic cleaner works",[56,283,284],{},"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.",[76,286,288],{"id":287},"where-acoustic-cleaners-are-used","Where acoustic cleaners are used",[56,290,291],{},"Acoustic cleaners are installed throughout the gas path and bulk-solids path of heavy industry:",[202,293,294,311,327,346,361],{},[205,295,296,299,300,179,304,179,308],{},[60,297,298],{},"Combustion plant"," — boilers, ",[65,301,303],{"href":302},"\u002Fglossary\u002Feconomiser","economisers",[65,305,307],{"href":306},"\u002Fglossary\u002Fsuperheater","superheaters",[65,309,310],{"href":100},"air heaters",[205,312,313,316,317,179,320,179,323],{},[60,314,315],{},"Air-pollution control"," — ",[65,318,319],{"href":177},"electrostatic precipitators",[65,321,322],{"href":85},"fabric filters",[65,324,326],{"href":325},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[205,328,329,316,332,336,337,341,342],{},[60,330,331],{},"Bulk solids",[65,333,335],{"href":334},"\u002Fglossary\u002Fhopper","hoppers, silos and bunkers"," prone to ",[65,338,340],{"href":339},"\u002Fglossary\u002Fbridging","bridging"," and ",[65,343,345],{"href":344},"\u002Fglossary\u002Frat-holing","rat-holing",[205,347,348,316,351,179,353,179,357],{},[60,349,350],{},"Cement",[65,352,183],{"href":182},[65,354,356],{"href":355},"\u002Fglossary\u002Fcalciner","calciners",[65,358,360],{"href":359},"\u002Fglossary\u002Fkiln-inlet-riser-duct","kiln inlets",[205,362,363,316,366,179,369],{},[60,364,365],{},"Pulp and paper",[65,367,368],{"href":190},"kraft recovery boilers",[65,370,372],{"href":371},"\u002Fglossary\u002Flime-kiln","lime kilns",[76,374,376],{"id":375},"acoustic-cleaners-are-not-ultrasonic-cleaners","Acoustic cleaners are not ultrasonic cleaners",[56,378,379,380,384,385,389],{},"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 ",[381,382,383],"em",{},"in situ"," with airborne sound. Ultrasonic cleaners operate above 20 kHz inside a liquid bath and clean small parts off-line by cavitation. See ",[65,386,388],{"href":387},"\u002Fglossary\u002Facoustic-cleaning-vs-ultrasonic-cleaning","acoustic cleaning vs ultrasonic cleaning",".",[76,391,200],{"id":199},[202,393,394,400,404,410],{},[205,395,396],{},[65,397,399],{"href":398},"\u002Fglossary\u002Facoustic-cleaning-system","Acoustic cleaning system",[205,401,402],{},[65,403,209],{"href":67},[205,405,406],{},[65,407,409],{"href":408},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[205,411,412],{},[65,413,415],{"href":414},"\u002Fglossary\u002Finfrasonic-cleaner","Infrasonic cleaner",{"title":232,"searchDepth":233,"depth":233,"links":417},[418,419,420,421],{"id":280,"depth":233,"text":281},{"id":287,"depth":233,"text":288},{"id":375,"depth":233,"text":376},{"id":199,"depth":233,"text":200},"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.",{},[425,248,426,427,249,428],"acoustic-cleaning-system","sonic-sootblower","infrasonic-cleaner","high-frequency-acoustic-cleaner",{"title":430,"description":431},"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.",[433,436,439],{"title":434,"url":435},"Power Magazine — The Theory and Application of Acoustic Cleaners","https:\u002F\u002Fwww.powermag.com\u002Fthe-theory-and-application-of-acoustic-cleaners\u002F",{"title":437,"url":438},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":440,"url":441},"Wikipedia — Acoustic cleaning","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAcoustic_cleaning","glossary\u002Facoustic-cleaner","MwPOKb4JllxnhygiJ3--SHn7B_zEw8BdkQXIXUCoV0E",{"id":445,"title":209,"aliases":446,"body":450,"category":240,"description":628,"extension":242,"meta":629,"navigation":244,"path":67,"relatedTerms":630,"seo":633,"sources":636,"stem":642,"term":209,"__hash__":643},"glossary\u002Fglossary\u002Fsonic-horn.md",[447,448,449],"sonic horns","sonic cleaning horn","industrial sonic horn",{"type":53,"value":451,"toc":621},[452,473,477,485,489,551,555,582,586,594,596],[56,453,58,454,456,457,459,460,179,462,179,465,179,467,341,470,389],{},[60,455,68],{}," 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 ",[65,458,276],{"href":214}," and the default specification for cleaning ",[65,461,178],{"href":177},[65,463,464],{"href":85},"baghouses",[65,466,326],{"href":325},[65,468,469],{"href":306},"boiler heat-transfer surfaces",[65,471,472],{"href":334},"hoppers and silos",[76,474,476],{"id":475},"how-a-sonic-horn-works","How a sonic horn works",[56,478,479,480,484],{},"Compressed plant air admitted through a ",[65,481,483],{"href":482},"\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.",[76,486,488],{"id":487},"key-parameters","Key parameters",[108,490,491,501],{},[111,492,493],{},[114,494,495,498],{},[117,496,497],{},"Parameter",[117,499,500],{},"Typical range",[124,502,503,511,519,527,535,543],{},[114,504,505,508],{},[129,506,507],{},"Fundamental frequency",[129,509,510],{},"60–400 Hz",[114,512,513,516],{},[129,514,515],{},"Sound pressure level",[129,517,518],{},"140–180 dB",[114,520,521,524],{},[129,522,523],{},"Compressed-air consumption",[129,525,526],{},"8–14 Nm³\u002Fmin at 4–7 bar",[114,528,529,532],{},[129,530,531],{},"Operating temperature (with appropriate materials)",[129,533,534],{},"−40 °C to +500 °C",[114,536,537,540],{},[129,538,539],{},"Firing cycle",[129,541,542],{},"5–15 s burst, repeated every 3–15 minutes",[114,544,545,548],{},[129,546,547],{},"Mass",[129,549,550],{},"15–60 kg depending on horn size",[76,552,554],{"id":553},"frequency-selection","Frequency selection",[56,556,557,558,179,560,562,563,179,567,569,570,179,573,576,577,341,580,389],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[65,559,183],{"href":182},[65,561,191],{"href":190},", large ",[65,564,566],{"href":565},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[65,568,187],{"href":186},". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[65,571,572],{"href":85},"fabric-filter compartments",[65,574,575],{"href":90},"catalyst layers"," and smaller hopper geometries. See ",[65,578,579],{"href":72},"low-frequency acoustic cleaner",[65,581,62],{"href":245},[76,583,585],{"id":584},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[56,587,588,589,593],{},"Sonic horns are increasingly specified alongside or in place of ",[65,590,592],{"href":591},"\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.",[76,595,200],{"id":199},[202,597,598,602,606,611,617],{},[205,599,600],{},[65,601,215],{"href":214},[205,603,604],{},[65,605,409],{"href":408},[205,607,608],{},[65,609,610],{"href":160},"Bell horn",[205,612,613],{},[65,614,616],{"href":615},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[205,618,619],{},[65,620,220],{"href":72},{"title":232,"searchDepth":233,"depth":233,"links":622},[623,624,625,626,627],{"id":475,"depth":233,"text":476},{"id":487,"depth":233,"text":488},{"id":553,"depth":233,"text":554},{"id":584,"depth":233,"text":585},{"id":199,"depth":233,"text":200},"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.",{},[247,425,426,631,632,249],"bell-horn","diaphragm-horn",{"title":634,"description":635},"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.",[637,638,639],{"title":256,"url":257},{"title":437,"url":438},{"title":640,"url":641},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",{"id":645,"title":220,"aliases":646,"body":649,"category":240,"description":824,"extension":242,"meta":825,"navigation":244,"path":72,"relatedTerms":826,"seo":827,"sources":830,"stem":833,"term":220,"__hash__":834},"glossary\u002Fglossary\u002Flow-frequency-acoustic-cleaner.md",[647,195,648],"low frequency sonic horn","LF acoustic cleaner",{"type":53,"value":650,"toc":818},[651,662,666,672,676,729,733,794,796],[56,652,58,653,655,656,658,659,661],{},[60,654,579],{}," is an industrial ",[65,657,68],{"href":67}," 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 ",[65,660,161],{"href":160}," than higher-frequency designs, fills large open vessels more uniformly and is the default choice for cleaning bulky industrial equipment.",[76,663,665],{"id":664},"why-frequency-choice-matters","Why frequency choice matters",[56,667,668,669,671],{},"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 ",[65,670,62],{"href":245}," for the complementary case.",[76,673,675],{"id":674},"typical-applications","Typical applications",[202,677,678,684,692,703,709,722],{},[205,679,680,683],{},[65,681,682],{"href":177},"Electrostatic precipitators"," — collecting-plate cleaning, hopper de-bridging",[205,685,686,341,689,691],{},[65,687,688],{"href":182},"Preheater cyclones",[65,690,356],{"href":355}," in cement plants",[205,693,694,697,698,702],{},[65,695,696],{"href":190},"Kraft recovery boilers"," — superheaters, ",[65,699,701],{"href":700},"\u002Fglossary\u002Fgenerating-bank","generating banks",", economisers",[205,704,705,708],{},[65,706,707],{"href":100},"Air heater"," cold-end basket cleaning",[205,710,711,712,179,716,341,718],{},"Large ",[65,713,715],{"href":714},"\u002Fglossary\u002Ffly-ash-hopper","fly-ash hoppers",[65,717,187],{"href":186},[65,719,721],{"href":720},"\u002Fglossary\u002Fbunker-coal-bunker","bunkers",[205,723,724,728],{},[65,725,727],{"href":726},"\u002Fglossary\u002Fheat-recovery-steam-generator","HRSG harp-tube banks"," in combined-cycle plants",[76,730,732],{"id":731},"indicative-selection-bands","Indicative selection bands",[108,734,735,748],{},[111,736,737],{},[114,738,739,742,745],{},[117,740,741],{},"Band",[117,743,744],{},"Wavelength in air at 20 °C",[117,746,747],{},"Typical use",[124,749,750,761,772,783],{},[114,751,752,755,758],{},[129,753,754],{},"60 Hz",[129,756,757],{},"~5.7 m",[129,759,760],{},"Very large ESPs, recovery boilers, deep silos",[114,762,763,766,769],{},[129,764,765],{},"75 Hz",[129,767,768],{},"~4.6 m",[129,770,771],{},"ESPs, preheater cyclones, large hoppers",[114,773,774,777,780],{},[129,775,776],{},"125 Hz",[129,778,779],{},"~2.7 m",[129,781,782],{},"Mid-size ESPs, baghouse compartments, calciners",[114,784,785,788,791],{},[129,786,787],{},"230 Hz",[129,789,790],{},"~1.5 m",[129,792,793],{},"Boiler convective passes, smaller hoppers, baghouses",[76,795,200],{"id":199},[202,797,798,802,806,810,814],{},[205,799,800],{},[65,801,209],{"href":67},[205,803,804],{},[65,805,215],{"href":214},[205,807,808],{},[65,809,47],{"href":245},[205,811,812],{},[65,813,415],{"href":414},[205,815,816],{},[65,817,610],{"href":160},{"title":232,"searchDepth":233,"depth":233,"links":819},[820,821,822,823],{"id":664,"depth":233,"text":665},{"id":674,"depth":233,"text":675},{"id":731,"depth":233,"text":732},{"id":199,"depth":233,"text":200},"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.",{},[247,248,428,427,631],{"title":828,"description":829},"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.",[831,832],{"title":256,"url":257},{"title":437,"url":438},"glossary\u002Flow-frequency-acoustic-cleaner","m6cj771ScgiY0798OZ0cdR03A65ardaL1YsF3e8jwFM",{"id":836,"title":225,"aliases":837,"body":841,"category":240,"description":1005,"extension":242,"meta":1006,"navigation":244,"path":165,"relatedTerms":1007,"seo":1008,"sources":1011,"stem":1013,"term":225,"__hash__":1014},"glossary\u002Fglossary\u002Fpiston-whistle-horn.md",[838,839,840],"piston whistle horn","rotary-disc horn","whistle horn",{"type":53,"value":842,"toc":1000},[843,855,859,862,890,904,908,980,982],[56,844,58,845,63,848,850,851,854],{},[60,846,847],{},"piston-whistle horn",[65,849,68],{"href":67}," whose sound is generated by a reciprocating piston or rotating slotted disc inside the driver, rather than by a flexing ",[65,852,853],{"href":615},"diaphragm",". The mechanism is closer to a steam-whistle or ship's siren scaled to industrial duty, and tends to occupy the upper end of the audible cleaning band — 250 to 450 Hz.",[76,856,858],{"id":857},"where-piston-whistle-horns-are-preferred","Where piston-whistle horns are preferred",[56,860,861],{},"Higher frequencies carry more acoustic energy per unit volume and couple efficiently into compact internal geometries. That makes piston-whistle and related high-frequency designs the usual choice for:",[202,863,864,870,880],{},[205,865,866,869],{},[65,867,868],{"href":85},"Fabric-filter"," compartments where filter bag spacing is tight",[205,871,872,875,876,879],{},[65,873,874],{"href":90},"Catalyst layers"," in ",[65,877,878],{"href":325},"SCR reactors"," where ash needs to be lifted from cell faces rather than projected across a large open volume",[205,881,882,883,341,886,889],{},"Small ",[65,884,885],{"href":334},"hoppers",[65,887,888],{"href":95},"cyclones"," where wavelength matching benefits from shorter waves",[56,891,892,893,179,895,179,897,899,900,903],{},"In larger open vessels — ",[65,894,566],{"href":565},[65,896,183],{"href":182},[65,898,191],{"href":190}," — long-wavelength ",[65,901,902],{"href":72},"low-frequency"," diaphragm horns penetrate further and are usually preferred.",[76,905,907],{"id":906},"trade-offs-versus-diaphragm-horns","Trade-offs versus diaphragm horns",[108,909,910,923],{},[111,911,912],{},[114,913,914,917,919],{},[117,915,916],{},"Attribute",[117,918,225],{},[117,920,921],{},[65,922,616],{"href":615},[124,924,925,936,947,958,969],{},[114,926,927,930,933],{},[129,928,929],{},"Typical frequency band",[129,931,932],{},"250–450 Hz",[129,934,935],{},"60–250 Hz",[114,937,938,941,944],{},[129,939,940],{},"Penetration in large vessels",[129,942,943],{},"Limited",[129,945,946],{},"Excellent",[114,948,949,952,955],{},[129,950,951],{},"Energy density at the target",[129,953,954],{},"High at short range",[129,956,957],{},"Moderate over longer range",[114,959,960,963,966],{},[129,961,962],{},"Wear part",[129,964,965],{},"Piston, seals, slot disc",[129,967,968],{},"Single diaphragm",[114,970,971,974,977],{},[129,972,973],{},"Best suited to",[129,975,976],{},"Fine dust, dense catalyst, small geometries",[129,978,979],{},"Open vessels, bulk solids",[76,981,200],{"id":199},[202,983,984,988,992,996],{},[205,985,986],{},[65,987,209],{"href":67},[205,989,990],{},[65,991,616],{"href":615},[205,993,994],{},[65,995,47],{"href":245},[205,997,998],{},[65,999,610],{"href":160},{"title":232,"searchDepth":233,"depth":233,"links":1001},[1002,1003,1004],{"id":857,"depth":233,"text":858},{"id":906,"depth":233,"text":907},{"id":199,"depth":233,"text":200},"A piston-whistle horn is a sonic horn whose sound is generated by a reciprocating piston or rotating slotted disc inside the driver, rather than by a flexing diaphragm. The mechanism is closer to a steam-whistle or ship's siren scaled to industrial duty, and tends to occupy the upper end of the audible cleaning band — 250 to 450 Hz.",{},[248,632,631,428],{"title":1009,"description":1010},"Piston-whistle horn — high-frequency sonic horn for fine dust","A piston-whistle horn generates sound through a moving piston or rotating disc rather than a vibrating diaphragm. Best suited to high-frequency cleaning duty on fabric filters and catalyst layers.",[1012],{"title":434,"url":435},"glossary\u002Fpiston-whistle-horn","YxUfCUOtrxNHj_LV3SdU9kaBYw-blqPp1Z_0-cyW3Qo",{"id":1016,"title":230,"aliases":1017,"body":1020,"category":1135,"description":1189,"extension":242,"meta":1190,"navigation":244,"path":85,"relatedTerms":1191,"seo":1196,"sources":1199,"stem":1204,"term":230,"__hash__":1205},"glossary\u002Fglossary\u002Ffabric-filter.md",[322,1018,1019],"bag filter","dust collector (fabric)",{"type":53,"value":1021,"toc":1184},[1022,1042,1046,1122,1126,1156,1158],[56,1023,58,1024,1027,1028,1032,1033,1037,1038,1041],{},[60,1025,1026],{},"fabric filter"," is an air-pollution-control device that removes particulate from a gas stream by passing the gas through woven or felted fibre media — usually in the form of cylindrical ",[65,1029,1031],{"href":1030},"\u002Fglossary\u002Ffilter-bag","filter bags"," — collecting dust as a cake on the bag surface and periodically releasing the cake into a hopper below. Fabric filters are the dominant particulate-control choice on cement plants, ",[65,1034,1036],{"href":1035},"\u002Fglossary\u002Fwaste-to-energy","waste-to-energy"," plants, ",[65,1039,1040],{"href":1035},"biomass"," boilers, metallurgical off-gas, food and chemical process exhaust.",[76,1043,1045],{"id":1044},"why-fabric-filters-compete-with-esps","Why fabric filters compete with ESPs",[108,1047,1048,1061],{},[111,1049,1050],{},[114,1051,1052,1054,1056],{},[117,1053,916],{},[117,1055,230],{},[117,1057,1058],{},[65,1059,1060],{"href":177},"ESP",[124,1062,1063,1074,1089,1100,1111],{},[114,1064,1065,1068,1071],{},[129,1066,1067],{},"Outlet particulate",[129,1069,1070],{},"\u003C 5 mg\u002FNm³ typical, \u003C 1 mg\u002FNm³ achievable",[129,1072,1073],{},"10–30 mg\u002FNm³ typical",[114,1075,1076,1083,1086],{},[129,1077,1078,1079],{},"Insensitivity to dust ",[65,1080,1082],{"href":1081},"\u002Fglossary\u002Fresistivity","resistivity",[129,1084,1085],{},"Yes",[129,1087,1088],{},"No (back-corona risk)",[114,1090,1091,1094,1097],{},[129,1092,1093],{},"Energy consumption",[129,1095,1096],{},"Higher (ΔP overcomes filter resistance)",[129,1098,1099],{},"Lower (electrostatic field only)",[114,1101,1102,1105,1108],{},[129,1103,1104],{},"Sensitivity to moisture \u002F dew point",[129,1106,1107],{},"High",[129,1109,1110],{},"Lower",[114,1112,1113,1116,1119],{},[129,1114,1115],{},"Footprint",[129,1117,1118],{},"Typically smaller",[129,1120,1121],{},"Typically larger",[76,1123,1125],{"id":1124},"where-sonic-horns-fit","Where sonic horns fit",[56,1127,1128,1131,1132,1136,1137,179,1141,1145,1146,1150,1151,1155],{},[65,1129,1130],{"href":67},"Sonic horns"," installed on a ",[65,1133,1135],{"href":1134},"\u002Fglossary\u002Fbaghouse","baghouse"," supplement the primary cleaning system (",[65,1138,1140],{"href":1139},"\u002Fglossary\u002Fpulse-jet-baghouse","pulse-jet",[65,1142,1144],{"href":1143},"\u002Fglossary\u002Freverse-air-baghouse","reverse-air"," or ",[65,1147,1149],{"href":1148},"\u002Fglossary\u002Fshaker-baghouse","shaker",") by reaching dust the primary cleaning misses, reducing ",[65,1152,1154],{"href":1153},"\u002Fglossary\u002Fdifferential-pressure-baghouse","differential pressure",", extending bag life and dislodging cake bridging in hoppers below the bags.",[76,1157,200],{"id":199},[202,1159,1160,1165,1170,1175,1180],{},[205,1161,1162],{},[65,1163,1164],{"href":1134},"Baghouse",[205,1166,1167],{},[65,1168,1169],{"href":1139},"Pulse-jet baghouse",[205,1171,1172],{},[65,1173,1174],{"href":1030},"Filter bag",[205,1176,1177],{},[65,1178,1179],{"href":1153},"Differential pressure (baghouse)",[205,1181,1182],{},[65,1183,209],{"href":67},{"title":232,"searchDepth":233,"depth":233,"links":1185},[1186,1187,1188],{"id":1044,"depth":233,"text":1045},{"id":1124,"depth":233,"text":1125},{"id":199,"depth":233,"text":200},"A fabric filter is an air-pollution-control device that removes particulate from a gas stream by passing the gas through woven or felted fibre media — usually in the form of cylindrical filter bags — collecting dust as a cake on the bag surface and periodically releasing the cake into a hopper below. Fabric filters are the dominant particulate-control choice on cement plants, waste-to-energy plants, biomass boilers, metallurgical off-gas, food and chemical process exhaust.",{},[1135,1192,1193,1194,248,1195],"pulse-jet-baghouse","reverse-air-baghouse","filter-bag","differential-pressure-baghouse",{"title":1197,"description":1198},"Fabric filter — principle, types and acoustic-cleaning benefits","A fabric filter removes particulate from a gas stream by passing it through woven or felted bag media. Sonic horns supplement primary cleaning and reduce differential pressure.",[1200,1203],{"title":1201,"url":1202},"Wikipedia — Baghouse","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBaghouse",{"title":259,"url":260},"glossary\u002Ffabric-filter","8AjQCKacGq0ZjbUhSjLFzVTtXfqr32f0IVjT2bihoZo",1782613733145]