[{"data":1,"prerenderedAt":1093},["ShallowReactive",2],{"site-footer-common":3,"glossary:fouling":45,"glossary-related:fouling":246},{"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":51,"category":227,"description":228,"extension":229,"meta":230,"navigation":231,"path":232,"relatedTerms":233,"seo":236,"sources":239,"stem":243,"term":244,"__hash__":245},"glossary\u002Fglossary\u002Ffouling.md","Fouling",[49,50],"process fouling","heat-transfer fouling",{"type":52,"value":53,"toc":220},"minimark",[54,120,125,165,169,182,186],[55,56,57,60,61,66,67,66,71,66,75,66,79,66,83,66,87,66,91,95,96,66,100,66,104,66,108,66,112,66,116,119],"p",{},[58,59,47],"strong",{}," is the accumulation of unwanted deposits on the surfaces of process equipment. It is the universal phenomenon that connects every application Sylio addresses: ",[62,63,65],"a",{"href":64},"\u002Fglossary\u002Fboiler","boilers",", ",[62,68,70],{"href":69},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",[62,72,74],{"href":73},"\u002Fglossary\u002Fbaghouse","baghouses",[62,76,78],{"href":77},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[62,80,82],{"href":81},"\u002Fglossary\u002Fhopper","hoppers and silos",[62,84,86],{"href":85},"\u002Fglossary\u002Fheat-recovery-steam-generator","HRSGs",[62,88,90],{"href":89},"\u002Fglossary\u002Fpreheater-tower","cement preheaters",[62,92,94],{"href":93},"\u002Fglossary\u002Frecovery-boiler","recovery boilers",". Different industries use different specific names for the resulting deposits — ",[62,97,99],{"href":98},"\u002Fglossary\u002Fslagging","slagging",[62,101,103],{"href":102},"\u002Fglossary\u002Fscaling","scaling",[62,105,107],{"href":106},"\u002Fglossary\u002Fcoking","coking",[62,109,111],{"href":110},"\u002Fglossary\u002Fbridging","bridging",[62,113,115],{"href":114},"\u002Fglossary\u002Fbuild-up-coating-accretion","coating",[62,117,118],{"href":114},"build-up"," — but fouling is the umbrella that connects them.",[121,122,124],"h2",{"id":123},"consequences-of-fouling","Consequences of fouling",[126,127,128,135,141,147,153,159],"ul",{},[129,130,131,134],"li",{},[58,132,133],{},"Heat-transfer loss"," — reducing thermal efficiency and raising fuel cost",[129,136,137,140],{},[58,138,139],{},"Pressure-drop rise"," — derating fans and raising power consumption",[129,142,143,146],{},[58,144,145],{},"Flow blockage"," — interrupting material flow in storage and process vessels",[129,148,149,152],{},[58,150,151],{},"Tube corrosion"," — beneath the deposit, accelerated by local chemistry",[129,154,155,158],{},[58,156,157],{},"Forced outages"," — when fouling becomes severe enough to force a shutdown",[129,160,161,164],{},[58,162,163],{},"Emission excursions"," — when air-pollution-control equipment loses effectiveness",[121,166,168],{"id":167},"mitigation-philosophy","Mitigation philosophy",[55,170,171,172,176,177,181],{},"The Sylio philosophy is ",[173,174,175],"em",{},"prevention over remediation",". Continuous low-amplitude ",[62,178,180],{"href":179},"\u002Fglossary\u002Fsonic-horn","sonic-horn"," cleaning keeps deposits from consolidating into the bonded layers that demand intensive periodic cleaning. The economic case is clear: every avoided forced outage typically justifies the entire acoustic-cleaning installation.",[121,183,185],{"id":184},"related-terms","Related terms",[126,187,188,193,198,203,209,215],{},[129,189,190],{},[62,191,192],{"href":98},"Slagging",[129,194,195],{},[62,196,197],{"href":102},"Scaling",[129,199,200],{},[62,201,202],{"href":106},"Coking",[129,204,205],{},[62,206,208],{"href":207},"\u002Fglossary\u002Fsintering-deposit","Sintering (deposit)",[129,210,211],{},[62,212,214],{"href":213},"\u002Fglossary\u002Fheat-transfer-surface-fouling","Heat-transfer surface fouling",[129,216,217],{},[62,218,219],{"href":179},"Sonic horn",{"title":221,"searchDepth":222,"depth":222,"links":223},"",2,[224,225,226],{"id":123,"depth":222,"text":124},{"id":167,"depth":222,"text":168},{"id":184,"depth":222,"text":185},"fouling","Fouling is the accumulation of unwanted deposits on the surfaces of process equipment. It is the universal phenomenon that connects every application Sylio addresses: boilers, ESPs, baghouses, SCR catalysts, hoppers and silos, HRSGs, cement preheaters, recovery boilers. Different industries use different specific names for the resulting deposits — slagging, scaling, coking, bridging, coating, build-up — but fouling is the umbrella that connects them.","md",{},true,"\u002Fglossary\u002Ffouling",[99,103,107,234,235,180],"sintering-deposit","heat-transfer-surface-fouling",{"title":237,"description":238},"Fouling — accumulation of unwanted deposits on process equipment surfaces","Fouling is the accumulation of unwanted deposits on process-equipment surfaces. The general umbrella term covering slagging, scaling, coking, sintering and many other specific mechanisms.",[240],{"title":241,"url":242},"Wikipedia — Fouling","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FFouling","glossary\u002Ffouling","Fouling (general)","vsFkT5ifjz3ggye30lYBeL42wZVcgPLYcyF9bwo9YnA",[247,414,538,636,729,867],{"id":248,"title":192,"aliases":249,"body":253,"category":227,"description":400,"extension":229,"meta":401,"navigation":231,"path":98,"relatedTerms":402,"seo":405,"sources":408,"stem":412,"term":192,"__hash__":413},"glossary\u002Fglossary\u002Fslagging.md",[250,251,252],"slag deposit","slag bonding","molten slag deposit",{"type":52,"value":254,"toc":395},[255,278,282,296,300,362,368,370],[55,256,257,259,260,264,265,269,270,274,275,277],{},[58,258,192],{}," is the deposition of molten or semi-molten ash on high-temperature surfaces inside a boiler — primarily the ",[62,261,263],{"href":262},"\u002Fglossary\u002Ffurnace","furnace"," ",[62,266,268],{"href":267},"\u002Fglossary\u002Fwaterwall","waterwalls"," and the finishing ",[62,271,273],{"href":272},"\u002Fglossary\u002Fsuperheater","superheater",". Slag is distinguished from ",[62,276,227],{"href":232}," generally by being formed at temperatures high enough to melt the ash; once cooled against the tube it solidifies as a hard, bonded layer.",[121,279,281],{"id":280},"why-slag-is-hard-to-clean","Why slag is hard to clean",[126,283,284,287,290,293],{},[129,285,286],{},"Bonded directly to the tube — not a loose surface deposit",[129,288,289],{},"Hardness comparable to the tube metal itself",[129,291,292],{},"Resists acoustic cleaning — sound energy cannot dislodge a bonded interface",[129,294,295],{},"Removable only with high-energy mechanical methods",[121,297,299],{"id":298},"cleaning-options","Cleaning options",[301,302,303,316],"table",{},[304,305,306],"thead",{},[307,308,309,313],"tr",{},[310,311,312],"th",{},"Tool",[310,314,315],{},"Use case",[317,318,319,331,343,354],"tbody",{},[307,320,321,328],{},[322,323,324],"td",{},[62,325,327],{"href":326},"\u002Fglossary\u002Fwater-cannon","Water cannon",[322,329,330],{},"Standard for furnace waterwall slag",[307,332,333,340],{},[322,334,335,336],{},"Steam ",[62,337,339],{"href":338},"\u002Fglossary\u002Fretract-sootblower","retract sootblower",[322,341,342],{},"Finishing superheater slag, with care for tube erosion",[307,344,345,351],{},[322,346,347],{},[62,348,350],{"href":349},"\u002Fglossary\u002Fexplosive-deslagging","Explosive deslagging",[322,352,353],{},"Severe build-up, periodic intervention",[307,355,356,359],{},[322,357,358],{},"Manual lancing (offline)",[322,360,361],{},"During major outages",[55,363,364,367],{},[62,365,366],{"href":179},"Sonic horns"," are not effective on furnace slag, but they are effective immediately downstream where deposits cool to a friable consistency. Sylio's value on slag-prone units lies in the convective pass, not in the furnace itself.",[121,369,185],{"id":184},[126,371,372,377,382,387,391],{},[129,373,374],{},[62,375,376],{"href":267},"Waterwall",[129,378,379],{},[62,380,381],{"href":272},"Superheater",[129,383,384],{},[62,385,386],{"href":262},"Furnace",[129,388,389],{},[62,390,47],{"href":232},[129,392,393],{},[62,394,327],{"href":326},{"title":221,"searchDepth":222,"depth":222,"links":396},[397,398,399],{"id":280,"depth":222,"text":281},{"id":298,"depth":222,"text":299},{"id":184,"depth":222,"text":185},"Slagging is the deposition of molten or semi-molten ash on high-temperature surfaces inside a boiler — primarily the furnace waterwalls and the finishing superheater. Slag is distinguished from fouling generally by being formed at temperatures high enough to melt the ash; once cooled against the tube it solidifies as a hard, bonded layer.",{},[403,273,263,227,404],"waterwall","water-cannon",{"title":406,"description":407},"Slagging — molten ash bonding to high-temperature boiler surfaces","Slagging is the deposition of molten or semi-molten ash on radiant and high-temperature surfaces in the boiler furnace. Hard, bonded; usually requires water cannons or explosive deslagging.",[409],{"title":410,"url":411},"Power Engineering — How to Deal with Ceaseless Slagging","https:\u002F\u002Fwww.power-eng.com\u002Foperations-maintenance\u002Fhow-to-deal-with-ceaseless-slagging\u002F","glossary\u002Fslagging","ETHZyOpE6ep9L5Ko6HI45eGDis7f8SAGpAWqJo3Z414",{"id":415,"title":197,"aliases":416,"body":419,"category":227,"description":525,"extension":229,"meta":526,"navigation":231,"path":102,"relatedTerms":527,"seo":530,"sources":533,"stem":535,"term":536,"__hash__":537},"glossary\u002Fglossary\u002Fscaling.md",[417,418],"scale deposit","mineral scale",{"type":52,"value":420,"toc":521},[421,431,435,497,502,504],[55,422,423,425,426,430],{},[58,424,197],{}," is the deposition of inorganic mineral salts (calcium carbonate, calcium sulphate, silica, magnesium silicate) on heat-transfer surfaces — typically the liquid side of an exchanger or boiler tube. Scaling is the dominant fouling mechanism in cooling-water systems, ",[62,427,429],{"href":428},"\u002Fglossary\u002Fmulti-effect-evaporator","multi-effect evaporators",", water-side boiler tubes and process heat exchangers.",[121,432,434],{"id":433},"distinguishing-scaling-from-gas-side-fouling","Distinguishing scaling from gas-side fouling",[301,436,437,451],{},[304,438,439],{},[307,440,441,444,446],{},[310,442,443],{},"Attribute",[310,445,197],{},[310,447,448,449],{},"Gas-side ",[62,450,227],{"href":232},[317,452,453,464,475,486],{},[307,454,455,458,461],{},[322,456,457],{},"Side of the tube",[322,459,460],{},"Liquid side",[322,462,463],{},"Gas side",[307,465,466,469,472],{},[322,467,468],{},"Mechanism",[322,470,471],{},"Inverse-solubility chemistry",[322,473,474],{},"Particulate adhesion",[307,476,477,480,483],{},[322,478,479],{},"Cleaning",[322,481,482],{},"Chemical, hydroblast",[322,484,485],{},"Mechanical, acoustic, steam",[307,487,488,491,494],{},[322,489,490],{},"Sonic-horn applicability",[322,492,493],{},"None",[322,495,496],{},"Where dry, friable",[55,498,499,501],{},[62,500,366],{"href":179}," address gas-side fouling, not water-side scaling. Liquid-side scale removal is the province of chemical cleaning campaigns, hydroblasting and other specialised techniques.",[121,503,185],{"id":184},[126,505,506,510,515],{},[129,507,508],{},[62,509,47],{"href":232},[129,511,512],{},[62,513,514],{"href":428},"Multi-effect evaporator",[129,516,517],{},[62,518,520],{"href":519},"\u002Fglossary\u002Fcold-end-corrosion-dew-point-corrosion","Cold-end corrosion \u002F dew-point corrosion",{"title":221,"searchDepth":222,"depth":222,"links":522},[523,524],{"id":433,"depth":222,"text":434},{"id":184,"depth":222,"text":185},"Scaling is the deposition of inorganic mineral salts (calcium carbonate, calcium sulphate, silica, magnesium silicate) on heat-transfer surfaces — typically the liquid side of an exchanger or boiler tube. Scaling is the dominant fouling mechanism in cooling-water systems, multi-effect evaporators, water-side boiler tubes and process heat exchangers.",{},[227,528,529],"multi-effect-evaporator","cold-end-corrosion-dew-point-corrosion",{"title":531,"description":532},"Scaling — mineral-deposit fouling typically associated with liquid-side equipment","Scaling is the deposition of inorganic mineral salts on heat-transfer surfaces, usually on the liquid side. Distinct from gas-side fouling; primarily addressed by chemical or mechanical means.",[534],{"title":241,"url":242},"glossary\u002Fscaling","Scaling (process)","iNgGAR6V18DGw1iG00M5EiTgVDd_BGRv66ubfmL4mVw",{"id":539,"title":202,"aliases":540,"body":543,"category":227,"description":621,"extension":229,"meta":622,"navigation":231,"path":106,"relatedTerms":623,"seo":626,"sources":629,"stem":633,"term":634,"__hash__":635},"glossary\u002Fglossary\u002Fcoking.md",[541,542],"coke deposition","cracking-furnace coking",{"type":52,"value":544,"toc":616},[545,550,554,575,578,589,597,599],[55,546,547,549],{},[58,548,202],{}," in refining and petrochemicals is the formation of hard carbonaceous deposits on hot process surfaces — typically inside ethylene-cracker furnace tubes, delayed-coker drums, and the radiant tubes of fired heaters. Coke forms by thermal cracking of hydrocarbons in stagnant or low-velocity zones, accumulating until a planned decoking outage removes it.",[121,551,553],{"id":552},"where-it-dominates","Where it dominates",[126,555,556,559,562,565,568],{},[129,557,558],{},"Ethylene-cracker furnace radiant tubes",[129,560,561],{},"Visbreaker furnaces",[129,563,564],{},"Delayed-coker process drums",[129,566,567],{},"Some refinery heater tubes",[129,569,570,574],{},[62,571,573],{"href":572},"\u002Fglossary\u002Ffluid-catalytic-cracking","FCC"," catalyst (different mechanism — burned off in the regenerator)",[121,576,479],{"id":577},"cleaning",[55,579,580,581,584,585,588],{},"Coke is hard, bonded, and refractory — far beyond what ",[62,582,583],{"href":179},"sonic horns"," can address. Standard cleaning is by ",[173,586,587],{},"decoking",": a campaign in which the heater is run with a steam-air mixture at elevated temperature, oxidising the deposit out of the tubes. Manual mechanical pigging is sometimes used on selected sections.",[55,590,591,592,596],{},"Acoustic cleaning is not a primary tool against coking, but downstream particulate-handling equipment (decoking-effluent dust collection, ",[62,593,595],{"href":594},"\u002Fglossary\u002Fclaus-unit-sulphur-recovery-unit","SRU"," adjacency) can benefit from sonic-horn coverage.",[121,598,185],{"id":184},[126,600,601,606,612],{},[129,602,603],{},[62,604,605],{"href":572},"Fluid catalytic cracking (FCC)",[129,607,608],{},[62,609,611],{"href":610},"\u002Fglossary\u002Freformer-furnace","Reformer furnace",[129,613,614],{},[62,615,47],{"href":232},{"title":221,"searchDepth":222,"depth":222,"links":617},[618,619,620],{"id":552,"depth":222,"text":553},{"id":577,"depth":222,"text":479},{"id":184,"depth":222,"text":185},"Coking in refining and petrochemicals is the formation of hard carbonaceous deposits on hot process surfaces — typically inside ethylene-cracker furnace tubes, delayed-coker drums, and the radiant tubes of fired heaters. Coke forms by thermal cracking of hydrocarbons in stagnant or low-velocity zones, accumulating until a planned decoking outage removes it.",{},[624,625,227],"fluid-catalytic-cracking","reformer-furnace",{"title":627,"description":628},"Coking — carbonaceous deposit on refining and petrochemical hot surfaces","Coking is the formation of hard carbonaceous deposits on hot process surfaces, typically inside ethylene crackers, delayed cokers and refining heaters. Removed by decoking campaigns.",[630],{"title":631,"url":632},"Wikipedia — Coking","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FCoking","glossary\u002Fcoking","Coking (process fouling)","YNgADF1QSopBqRugwNPIPIssGOa4lrCrnxZ70BvpBmg",{"id":637,"title":208,"aliases":638,"body":641,"category":227,"description":715,"extension":229,"meta":716,"navigation":231,"path":207,"relatedTerms":717,"seo":719,"sources":722,"stem":726,"term":727,"__hash__":728},"glossary\u002Fglossary\u002Fsintering-deposit.md",[639,640],"deposit sintering","ash sintering",{"type":52,"value":642,"toc":710},[643,649,653,659,663,674,688,690],[55,644,645,648],{},[58,646,647],{},"Sintering",", when applied to fouling deposits, is the bonding-together of particles into harder consolidated layers under sustained temperature. A fresh deposit is friable and easy to remove; an aged deposit on a hot tube surface gradually fuses into a bonded film that resists all but the most aggressive cleaning.",[121,650,652],{"id":651},"why-early-intervention-matters","Why early intervention matters",[55,654,655,656,658],{},"The asymmetry between fresh and sintered deposit cleanability is the underlying argument for continuous acoustic cleaning. A fresh dust layer responds to a single ",[62,657,180],{"href":179}," pulse; the same dust two days later may resist a full steam-sootblower cycle; two weeks later only water-washing during an outage removes it.",[121,660,662],{"id":661},"temperature-drives-sintering-rate","Temperature drives sintering rate",[126,664,665,668,671],{},[129,666,667],{},"Below 600 °C — sintering is slow; deposits remain friable for days",[129,669,670],{},"600–800 °C — sintering accelerates; friable phase lasts hours",[129,672,673],{},"Above 800 °C — sintering is rapid; partly molten components bond on contact",[55,675,676,677,66,679,683,684,687],{},"This temperature-driven asymmetry is why ",[62,678,94],{"href":93},[62,680,682],{"href":681},"\u002Fglossary\u002Fwaste-to-energy","WtE"," boilers and high-AFR ",[62,685,686],{"href":89},"cement plants"," — all running at the higher end of these ranges — benefit most from continuous cleaning.",[121,689,185],{"id":184},[126,691,692,696,700,706],{},[129,693,694],{},[62,695,47],{"href":232},[129,697,698],{},[62,699,192],{"href":98},[129,701,702],{},[62,703,705],{"href":704},"\u002Fglossary\u002Flow-melt-sticky-ash","Low-melt sticky ash",[129,707,708],{},[62,709,219],{"href":179},{"title":221,"searchDepth":222,"depth":222,"links":711},[712,713,714],{"id":651,"depth":222,"text":652},{"id":661,"depth":222,"text":662},{"id":184,"depth":222,"text":185},"Sintering, when applied to fouling deposits, is the bonding-together of particles into harder consolidated layers under sustained temperature. A fresh deposit is friable and easy to remove; an aged deposit on a hot tube surface gradually fuses into a bonded film that resists all but the most aggressive cleaning.",{},[227,99,718,180],"low-melt-sticky-ash",{"title":720,"description":721},"Sintering (of deposits) — bonding of fouling particles into harder consolidated layers","Sintering is the bonding-together of fouling particles into harder consolidated layers under sustained temperature. Why early intervention matters: cleaning before sintering is far easier.",[723],{"title":724,"url":725},"Wikipedia — Sintering","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSintering","glossary\u002Fsintering-deposit","Sintering (of deposits)","12PC9mViC73tqQ2ZrBxVyQPykY44a6F8mhzZyearbxE",{"id":730,"title":214,"aliases":731,"body":734,"category":227,"description":855,"extension":229,"meta":856,"navigation":231,"path":213,"relatedTerms":857,"seo":860,"sources":863,"stem":865,"term":214,"__hash__":866},"glossary\u002Fglossary\u002Fheat-transfer-surface-fouling.md",[732,733],"HTS fouling","heat transfer fouling",{"type":52,"value":735,"toc":850},[736,746,750,753,807,819,823,828,830],[55,737,738,740,741,745],{},[58,739,214],{}," is the engineering term for ",[62,742,744],{"href":743},"\u002Fglossary\u002Ftube-fouling","tube fouling"," viewed from the thermodynamic-impact angle. A fouling layer adds a thermal-resistance term in series with the underlying tube wall and the inside\u002Foutside film coefficients, reducing the overall heat-transfer coefficient (U) for the tube.",[121,747,749],{"id":748},"quantifying-the-effect","Quantifying the effect",[55,751,752],{},"The added fouling resistance R_f is reported in m²·K\u002FW (or h·ft²·°F\u002FBtu in US units). Typical published values:",[301,754,755,765],{},[304,756,757],{},[307,758,759,762],{},[310,760,761],{},"Service",[310,763,764],{},"R_f (m²·K\u002FW)",[317,766,767,775,783,791,799],{},[307,768,769,772],{},[322,770,771],{},"Clean steam-side",[322,773,774],{},"0",[307,776,777,780],{},[322,778,779],{},"Clean coal-fired boiler gas-side",[322,781,782],{},"~0.0005",[307,784,785,788],{},[322,786,787],{},"Fouled coal-fired economiser",[322,789,790],{},"0.001–0.003",[307,792,793,796],{},[322,794,795],{},"Heavily-fouled biomass \u002F WtE superheater",[322,797,798],{},"0.005+",[307,800,801,804],{},[322,802,803],{},"Acid-dew-point-corroded air heater",[322,805,806],{},"severe + corrosion",[55,808,809,810,813,814,818],{},"Doubling R_f roughly halves the ",[173,811,812],{},"useful"," heat-transfer coefficient for the surface, with proportional impact on ",[62,815,817],{"href":816},"\u002Fglossary\u002Fheat-rate","heat rate",".",[121,820,822],{"id":821},"why-sonic-horns-matter-here","Why sonic horns matter here",[55,824,825,827],{},[62,826,366],{"href":179}," keep R_f close to its design value over the operating campaign by preventing the friable-to-bonded transition that drives R_f up. Plants commonly report 1–3% heat-rate improvement on retrofitting horns to a unit with established fouling drift.",[121,829,185],{"id":184},[126,831,832,837,841,846],{},[129,833,834],{},[62,835,836],{"href":743},"Tube fouling",[129,838,839],{},[62,840,47],{"href":232},[129,842,843],{},[62,844,845],{"href":816},"Heat rate",[129,847,848],{},[62,849,219],{"href":179},{"title":221,"searchDepth":222,"depth":222,"links":851},[852,853,854],{"id":748,"depth":222,"text":749},{"id":821,"depth":222,"text":822},{"id":184,"depth":222,"text":185},"Heat-transfer surface fouling is the engineering term for tube fouling viewed from the thermodynamic-impact angle. A fouling layer adds a thermal-resistance term in series with the underlying tube wall and the inside\u002Foutside film coefficients, reducing the overall heat-transfer coefficient (U) for the tube.",{},[858,227,859,180],"tube-fouling","heat-rate",{"title":861,"description":862},"Heat-transfer surface fouling — the economic-impact framing of tube fouling","Heat-transfer surface fouling describes tube fouling from the economic-impact angle: thermal-resistance addition that reduces heat absorption and degrades plant heat rate.",[864],{"title":241,"url":242},"glossary\u002Fheat-transfer-surface-fouling","HOgx9fE9OodHg7wlwZ1yOIB394kDR0pB_D6XdluG3VA",{"id":868,"title":219,"aliases":869,"body":872,"category":1068,"description":1069,"extension":229,"meta":1070,"navigation":231,"path":179,"relatedTerms":1071,"seo":1078,"sources":1081,"stem":1091,"term":219,"__hash__":1092},"glossary\u002Fglossary\u002Fsonic-horn.md",[583,870,871],"sonic cleaning horn","industrial sonic horn",{"type":52,"value":873,"toc":1061},[874,899,903,911,915,977,981,1017,1021,1029,1031],[55,875,876,877,880,881,885,886,66,888,66,891,66,893,896,897,818],{},"A ",[58,878,879],{},"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 ",[62,882,884],{"href":883},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[62,887,70],{"href":69},[62,889,74],{"href":890},"\u002Fglossary\u002Ffabric-filter",[62,892,78],{"href":77},[62,894,895],{"href":272},"boiler heat-transfer surfaces"," and ",[62,898,82],{"href":81},[121,900,902],{"id":901},"how-a-sonic-horn-works","How a sonic horn works",[55,904,905,906,910],{},"Compressed plant air admitted through a ",[62,907,909],{"href":908},"\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.",[121,912,914],{"id":913},"key-parameters","Key parameters",[301,916,917,927],{},[304,918,919],{},[307,920,921,924],{},[310,922,923],{},"Parameter",[310,925,926],{},"Typical range",[317,928,929,937,945,953,961,969],{},[307,930,931,934],{},[322,932,933],{},"Fundamental frequency",[322,935,936],{},"60–400 Hz",[307,938,939,942],{},[322,940,941],{},"Sound pressure level",[322,943,944],{},"140–180 dB",[307,946,947,950],{},[322,948,949],{},"Compressed-air consumption",[322,951,952],{},"8–14 Nm³\u002Fmin at 4–7 bar",[307,954,955,958],{},[322,956,957],{},"Operating temperature (with appropriate materials)",[322,959,960],{},"−40 °C to +500 °C",[307,962,963,966],{},[322,964,965],{},"Firing cycle",[322,967,968],{},"5–15 s burst, repeated every 3–15 minutes",[307,970,971,974],{},[322,972,973],{},"Mass",[322,975,976],{},"15–60 kg depending on horn size",[121,978,980],{"id":979},"frequency-selection","Frequency selection",[55,982,983,984,66,988,991,992,66,996,1000,1001,66,1004,1008,1009,896,1013,818],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[62,985,987],{"href":986},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[62,989,990],{"href":93},"recovery-boiler superheaters",", large ",[62,993,995],{"href":994},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[62,997,999],{"href":998},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[62,1002,1003],{"href":890},"fabric-filter compartments",[62,1005,1007],{"href":1006},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[62,1010,1012],{"href":1011},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[62,1014,1016],{"href":1015},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[121,1018,1020],{"id":1019},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[55,1022,1023,1024,1028],{},"Sonic horns are increasingly specified alongside or in place of ",[62,1025,1027],{"href":1026},"\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.",[121,1030,185],{"id":184},[126,1032,1033,1038,1044,1050,1056],{},[129,1034,1035],{},[62,1036,1037],{"href":883},"Acoustic cleaner",[129,1039,1040],{},[62,1041,1043],{"href":1042},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[129,1045,1046],{},[62,1047,1049],{"href":1048},"\u002Fglossary\u002Fbell-horn","Bell horn",[129,1051,1052],{},[62,1053,1055],{"href":1054},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[129,1057,1058],{},[62,1059,1060],{"href":1011},"Low-frequency acoustic cleaner",{"title":221,"searchDepth":222,"depth":222,"links":1062},[1063,1064,1065,1066,1067],{"id":901,"depth":222,"text":902},{"id":913,"depth":222,"text":914},{"id":979,"depth":222,"text":980},{"id":1019,"depth":222,"text":1020},{"id":184,"depth":222,"text":185},"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.",{},[1072,1073,1074,1075,1076,1077],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":1079,"description":1080},"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.",[1082,1085,1088],{"title":1083,"url":1084},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":1086,"url":1087},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":1089,"url":1090},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613738855]