[{"data":1,"prerenderedAt":1089},["ShallowReactive",2],{"site-footer-common":3,"glossary:low-melt-sticky-ash":45,"glossary-related:low-melt-sticky-ash":195},{"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":175,"description":176,"extension":177,"meta":178,"navigation":179,"path":180,"relatedTerms":181,"seo":186,"sources":189,"stem":193,"term":47,"__hash__":194},"glossary\u002Fglossary\u002Flow-melt-sticky-ash.md","Low-melt sticky ash",[49,50,51],"sticky ash","low-melting ash","alkali-rich sticky ash",{"type":53,"value":54,"toc":167},"minimark",[55,77,82,90,94,106,110,134,138],[56,57,58,61,62,67,68,71,72,76],"p",{},[59,60,47],"strong",{}," is the universal headache of ",[63,64,66],"a",{"href":65},"\u002Fglossary\u002Fwaste-to-energy","biomass"," and ",[63,69,70],{"href":65},"waste-to-energy"," boiler operation. It forms when ash particles rich in ",[63,73,75],{"href":74},"\u002Fglossary\u002Falkali-metals-in-ash","alkali metals"," (K, Na) and chlorides soften at typical convective-pass gas temperatures (700–900 °C) and bond to cooler tube surfaces on contact.",[78,79,81],"h2",{"id":80},"why-it-defeats-steam-sootblowers","Why it defeats steam sootblowers",[56,83,84,85,89],{},"A steam jet from an ",[63,86,88],{"href":87},"\u002Fglossary\u002Fik-long-retract-sootblower","IK retract sootblower"," is highly effective on dry, friable ash but largely ineffective on a deposit that has bonded as a continuous sticky film. The steam removes only the loose surface layer; the bonded under-layer remains and continues to grow.",[78,91,93],{"id":92},"why-sonic-horns-help","Why sonic horns help",[56,95,96,100,101,105],{},[63,97,99],{"href":98},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," work ",[102,103,104],"em",{},"before"," the deposit consolidates. Continuous low-amplitude vibration during the early sticky phase prevents the deposit from forming a bonded interface with the tube. The ash remains friable enough to be released by sootblowers or by the next horn pulse, rather than building up into a self-reinforcing sticky mass.",[78,107,109],{"id":108},"where-it-dominates","Where it dominates",[111,112,113,121,128,131],"ul",{},[114,115,116,117],"li",{},"Recovery boilers — see ",[63,118,120],{"href":119},"\u002Fglossary\u002Fcarry-over","carry-over",[114,122,123,127],{},[63,124,126],{"href":125},"\u002Fglossary\u002Fstraw-agricultural-residue-firing","Straw"," and high-alkali biomass",[114,129,130],{},"WtE boilers, especially with high-RDF feed",[114,132,133],{},"Petcoke firing in some configurations",[78,135,137],{"id":136},"related-terms","Related terms",[111,139,140,145,151,156,162],{},[114,141,142],{},[63,143,144],{"href":74},"Alkali metals in ash",[114,146,147],{},[63,148,150],{"href":149},"\u002Fglossary\u002Fchloride-induced-corrosion","Chloride-induced corrosion",[114,152,153],{},[63,154,155],{"href":65},"Waste-to-energy",[114,157,158],{},[63,159,161],{"href":160},"\u002Fglossary\u002Fsuperheater","Superheater",[114,163,164],{},[63,165,166],{"href":98},"Sonic horn",{"title":168,"searchDepth":169,"depth":169,"links":170},"",2,[171,172,173,174],{"id":80,"depth":169,"text":81},{"id":92,"depth":169,"text":93},{"id":108,"depth":169,"text":109},{"id":136,"depth":169,"text":137},"wte-biomass","Low-melt sticky ash is the universal headache of biomass and waste-to-energy boiler operation. It forms when ash particles rich in alkali metals (K, Na) and chlorides soften at typical convective-pass gas temperatures (700–900 °C) and bond to cooler tube surfaces on contact.","md",{},true,"\u002Fglossary\u002Flow-melt-sticky-ash",[182,183,70,184,185],"alkali-metals-in-ash","chloride-induced-corrosion","superheater","sonic-horn",{"title":187,"description":188},"Low-melt sticky ash — the universal headache of biomass and WtE cleaning","Low-melt sticky ash forms when alkali-rich ash particles soften at typical convective-pass temperatures and bond to tube surfaces. Defeats steam sootblowers; primary target for sonic horns.",[190],{"title":191,"url":192},"Wikipedia — Slagging and fouling in boilers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBoiler#Slagging","glossary\u002Flow-melt-sticky-ash","T-fxgBz2Ckq6-Jqq1LywnOSrLjgAelnaRUCmw8i4qQA",[196,391,515,707,863],{"id":197,"title":144,"aliases":198,"body":202,"category":175,"description":377,"extension":177,"meta":378,"navigation":179,"path":74,"relatedTerms":379,"seo":384,"sources":387,"stem":389,"term":144,"__hash__":390},"glossary\u002Fglossary\u002Falkali-metals-in-ash.md",[199,200,201],"sodium in ash","potassium in ash","alkali loading",{"type":53,"value":203,"toc":371},[204,213,217,297,301,335,339,345,347],[56,205,206,209,210,212],{},[59,207,208],{},"Alkali metals"," — primarily sodium (Na) and potassium (K) — are the dominant drivers of low-melting fouling in biomass, ",[63,211,70],{"href":65}," and certain coal boilers. Alkali compounds (KCl, NaCl, K₂SO₄, Na₂SO₄) melt or soften at temperatures (650–900 °C) lower than typical convective-pass tube-metal temperatures, so they arrive at the tube surface partly molten and bond tenaciously.",[78,214,216],{"id":215},"where-alkali-concentration-is-high","Where alkali concentration is high",[218,219,220,233],"table",{},[221,222,223],"thead",{},[224,225,226,230],"tr",{},[227,228,229],"th",{},"Fuel",[227,231,232],{},"Approximate alkali-in-ash range",[234,235,236,245,257,268,279,289],"tbody",{},[224,237,238,242],{},[239,240,241],"td",{},"Wood (clean stems)",[239,243,244],{},"Low (1–5%)",[224,246,247,254],{},[239,248,249,250],{},"Bark, ",[63,251,253],{"href":252},"\u002Fglossary\u002Fhog-fuel","hog fuel",[239,255,256],{},"Medium (5–15%)",[224,258,259,265],{},[239,260,261,262],{},"Straw and ",[63,263,264],{"href":125},"agricultural residues",[239,266,267],{},"High (10–25%)",[224,269,270,276],{},[239,271,272],{},[63,273,275],{"href":274},"\u002Fglossary\u002Fbagasse","Bagasse",[239,277,278],{},"Medium-high",[224,280,281,286],{},[239,282,283],{},[63,284,285],{"href":65},"MSW \u002F RDF \u002F SRF",[239,287,288],{},"High (variable)",[224,290,291,294],{},[239,292,293],{},"Coal",[239,295,296],{},"Low",[78,298,300],{"id":299},"operational-consequences","Operational consequences",[111,302,303,308,316,323],{},[114,304,305,307],{},[63,306,47],{"href":180}," bonding to superheater and economiser tubes",[114,309,310,311,315],{},"Accelerated ",[63,312,314],{"href":313},"\u002Fglossary\u002Ftube-erosion-tube-wastage","tube wastage"," from corrosive deposits",[114,317,318,322],{},[63,319,321],{"href":320},"\u002Fglossary\u002Fcatalyst-poisoning","SCR catalyst poisoning"," by alkali species",[114,324,325,326,67,330,334],{},"Bed-material agglomeration in ",[63,327,329],{"href":328},"\u002Fglossary\u002Fbfb-boiler","BFB",[63,331,333],{"href":332},"\u002Fglossary\u002Fcfb-boiler","CFB"," boilers",[78,336,338],{"id":337},"cleaning","Cleaning",[56,340,341,342,344],{},"Active ",[63,343,185],{"href":98}," cleaning prevents fresh alkali-rich deposits from consolidating into bonded slag, which is the only practical mitigation short of fuel substitution.",[78,346,137],{"id":136},[111,348,349,353,357,362,366],{},[114,350,351],{},[63,352,47],{"href":180},[114,354,355],{},[63,356,150],{"href":149},[114,358,359],{},[63,360,361],{"href":320},"Catalyst poisoning",[114,363,364],{},[63,365,275],{"href":274},[114,367,368],{},[63,369,370],{"href":125},"Straw \u002F agricultural-residue firing",{"title":168,"searchDepth":169,"depth":169,"links":372},[373,374,375,376],{"id":215,"depth":169,"text":216},{"id":299,"depth":169,"text":300},{"id":337,"depth":169,"text":338},{"id":136,"depth":169,"text":137},"Alkali metals — primarily sodium (Na) and potassium (K) — are the dominant drivers of low-melting fouling in biomass, waste-to-energy and certain coal boilers. Alkali compounds (KCl, NaCl, K₂SO₄, Na₂SO₄) melt or soften at temperatures (650–900 °C) lower than typical convective-pass tube-metal temperatures, so they arrive at the tube surface partly molten and bond tenaciously.",{},[380,183,381,382,383],"low-melt-sticky-ash","catalyst-poisoning","bagasse","straw-agricultural-residue-firing",{"title":385,"description":386},"Alkali metals in ash — sodium and potassium drive low-melt biomass fouling","Alkali metals (Na, K) in biomass and waste-fuel ash form low-melting compounds that bond to boiler tubes as sticky deposits and poison SCR catalysts.",[388],{"title":191,"url":192},"glossary\u002Falkali-metals-in-ash","geS4Q08TCk13dlbSDSxT-BXr_OYi5LW7UIKYIEm_0_0",{"id":392,"title":150,"aliases":393,"body":397,"category":175,"description":501,"extension":177,"meta":502,"navigation":179,"path":149,"relatedTerms":503,"seo":506,"sources":509,"stem":513,"term":150,"__hash__":514},"glossary\u002Fglossary\u002Fchloride-induced-corrosion.md",[394,395,396],"Cl corrosion","chloride corrosion","high-temperature chloride corrosion",{"type":53,"value":398,"toc":495},[399,411,415,418,420,437,441,468,470],[56,400,401,403,404,407,408,410],{},[59,402,150],{}," is the accelerated tube-wall thinning caused by chlorine-rich deposits on the steam-side surfaces of ",[63,405,406],{"href":65},"WtE",", ",[63,409,66],{"href":65}," and waste-fired boilers. Chloride corrosion is the dominant tube-failure mechanism in WtE and a major maintenance cost driver.",[78,412,414],{"id":413},"mechanism","Mechanism",[56,416,417],{},"Chlorine in the fuel enters the gas phase as HCl and metal chlorides. Inside a thin deposit on the tube, chloride and metal-chloride species shuttle electrons between the gas atmosphere and the tube surface. The result is rapid metal loss far in excess of what the temperature alone would predict. The \"active oxidation\" mechanism describes one variant; chloride attack on the protective oxide scale describes another.",[78,419,109],{"id":108},[111,421,422,425,431,434],{},[114,423,424],{},"WtE superheaters — design temperatures kept low (380–420 °C) specifically to limit chloride corrosion",[114,426,427,428],{},"Straw-fired boilers — see ",[63,429,430],{"href":125},"straw firing",[114,432,433],{},"RDF \u002F SRF boilers — variable but generally high",[114,435,436],{},"Heavy-petroleum-fired boilers with chloride contamination",[78,438,440],{"id":439},"mitigation","Mitigation",[111,442,443,449,455,461],{},[114,444,445,448],{},[59,446,447],{},"Material selection"," — Inconel-625 weld overlays, nickel-based alloys on the most-exposed tubes",[114,450,451,454],{},[59,452,453],{},"Lower steam temperature"," at the superheater outlet to keep tube-metal below the corrosion threshold",[114,456,457,460],{},[59,458,459],{},"Fuel control"," — limit chloride loading where the contract permits",[114,462,463,467],{},[59,464,465],{},[63,466,99],{"href":98}," — preventing deposits from consolidating reduces the chloride concentration immediately adjacent to the tube surface, indirectly slowing corrosion",[78,469,137],{"id":136},[111,471,472,476,480,484,490],{},[114,473,474],{},[63,475,155],{"href":65},[114,477,478],{},[63,479,144],{"href":74},[114,481,482],{},[63,483,47],{"href":180},[114,485,486],{},[63,487,489],{"href":488},"\u002Fglossary\u002Fcold-end-corrosion-dew-point-corrosion","Cold-end corrosion \u002F dew-point corrosion",[114,491,492],{},[63,493,494],{"href":313},"Tube erosion \u002F tube wastage",{"title":168,"searchDepth":169,"depth":169,"links":496},[497,498,499,500],{"id":413,"depth":169,"text":414},{"id":108,"depth":169,"text":109},{"id":439,"depth":169,"text":440},{"id":136,"depth":169,"text":137},"Chloride-induced corrosion is the accelerated tube-wall thinning caused by chlorine-rich deposits on the steam-side surfaces of WtE, biomass and waste-fired boilers. Chloride corrosion is the dominant tube-failure mechanism in WtE and a major maintenance cost driver.",{},[70,182,380,504,505],"cold-end-corrosion-dew-point-corrosion","tube-erosion-tube-wastage",{"title":507,"description":508},"Chloride-induced corrosion — accelerated tube wastage in WtE and biomass boilers","Chloride-induced corrosion is the accelerated tube-wall thinning caused by chlorine-rich deposits on WtE and biomass boilers. The dominant tube-failure mechanism in WtE.",[510],{"title":511,"url":512},"npj Materials Degradation — Low-temperature corrosion in biomass boilers","https:\u002F\u002Fwww.nature.com\u002Farticles\u002Fs41529-025-00640-4","glossary\u002Fchloride-induced-corrosion","PVL_lGkefdByes5ldZdrOSzMPRd3dW-6jJv-GqlhciY",{"id":516,"title":517,"aliases":518,"body":522,"category":175,"description":689,"extension":177,"meta":690,"navigation":179,"path":65,"relatedTerms":691,"seo":695,"sources":698,"stem":705,"term":155,"__hash__":706},"glossary\u002Fglossary\u002Fwaste-to-energy.md","Waste-to-energy (WtE \u002F EfW)",[406,519,520,521],"EfW","energy-from-waste","MSW incineration",{"type":53,"value":523,"toc":684},[524,547,573,577,580,606,617,621,656,658],[56,525,526,529,530,533,534,407,538,542,543,546],{},[59,527,528],{},"Waste-to-energy (WtE)"," — equivalently ",[102,531,532],{},"energy-from-waste (EfW)"," — burns ",[63,535,537],{"href":536},"\u002Fglossary\u002Fmunicipal-solid-waste","municipal solid waste (MSW)",[63,539,541],{"href":540},"\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 ",[63,544,545],{"href":98},"sonic horns"," worldwide, driven by:",[111,548,549,555,561,567],{},[114,550,551,554],{},[59,552,553],{},"EU policy"," — landfill diversion targets, EU ETS extension to WtE from 2028",[114,556,557,560],{},[59,558,559],{},"UK"," — recent tightening of criteria for new WtE plants raises operating-efficiency expectations",[114,562,563,566],{},[59,564,565],{},"EPC pipeline"," — major projects from Hitachi Zosen Inova \u002F Kanadevia Inova, Babcock & Wilcox Vølund, Paprec Énergies, Keppel Seghers, ANDRITZ, Valmet",[114,568,569,572],{},[59,570,571],{},"Operator economics"," — tipping fees underwrite high-availability targets",[78,574,576],{"id":575},"why-wte-is-uniquely-fouling-prone","Why WtE is uniquely fouling-prone",[56,578,579],{},"Three converging factors make WtE boilers harder to clean than conventional fossil-fuel plants:",[111,581,582,591,600],{},[114,583,584,587,588,590],{},[59,585,586],{},"High chlorine content"," in waste fuels → ",[63,589,395],{"href":149}," and sticky deposits",[114,592,593,596,597],{},[59,594,595],{},"High alkali content"," (Na, K from food, paper, biomass fractions) → ",[63,598,599],{"href":180},"low-melt sticky ash",[114,601,602,605],{},[59,603,604],{},"Variable fuel composition"," → unpredictable fouling intensity",[56,607,608,609,613,614,616],{},"Conventional steam ",[63,610,612],{"href":611},"\u002Fglossary\u002Fsteam-sootblower","sootblowing"," accelerates ",[63,615,314],{"href":313}," on the chloride-rich, low-melt deposits typical of WtE; acoustic cleaning is the safer alternative.",[78,618,620],{"id":619},"where-sonic-horns-sit-in-wte-plants","Where sonic horns sit in WtE plants",[111,622,623,629,640,646,651],{},[114,624,625,628],{},[59,626,627],{},"Boiler convective pass"," — superheater, evaporator, economiser tube banks",[114,630,631,634,635,639],{},[59,632,633],{},"SCR catalyst layers"," — high-dust ",[63,636,638],{"href":637},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR"," on WtE",[114,641,642,645],{},[59,643,644],{},"Flue-gas ducting"," between boiler and treatment train",[114,647,648],{},[59,649,650],{},"Bag-filter compartments and hoppers",[114,652,653],{},[59,654,655],{},"Bottom-ash and fly-ash hoppers",[78,657,137],{"id":136},[111,659,660,665,670,676,680],{},[114,661,662],{},[63,663,664],{"href":536},"Municipal solid waste (MSW)",[114,666,667],{},[63,668,669],{"href":540},"RDF \u002F SRF \u002F TDF",[114,671,672],{},[63,673,675],{"href":674},"\u002Fglossary\u002Fgrate-fired-boiler-mass-burn-incinerator","Grate-fired boiler \u002F mass-burn incinerator",[114,677,678],{},[63,679,150],{"href":149},[114,681,682],{},[63,683,166],{"href":98},{"title":168,"searchDepth":169,"depth":169,"links":685},[686,687,688],{"id":575,"depth":169,"text":576},{"id":619,"depth":169,"text":620},{"id":136,"depth":169,"text":137},"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:",{},[692,693,694,183,185],"municipal-solid-waste","rdf-srf-tdf","grate-fired-boiler-mass-burn-incinerator",{"title":696,"description":697},"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.",[699,702],{"title":700,"url":701},"Wikipedia — Waste-to-energy","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FWaste-to-energy",{"title":703,"url":704},"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",{"id":708,"title":161,"aliases":709,"body":714,"category":846,"description":847,"extension":177,"meta":848,"navigation":179,"path":160,"relatedTerms":849,"seo":854,"sources":857,"stem":861,"term":161,"__hash__":862},"glossary\u002Fglossary\u002Fsuperheater.md",[710,711,712,713],"superheaters","primary superheater","secondary superheater","finishing superheater",{"type":53,"value":715,"toc":841},[716,727,731,768,770,779,803,806,808],[56,717,718,719,721,722,726],{},"A ",[59,720,184],{}," is a tube bank in a boiler's ",[63,723,725],{"href":724},"\u002Fglossary\u002Fconvective-pass-backpass","convective pass"," that raises the steam temperature beyond its saturation point using residual heat from the flue gas. Most utility boilers have at least two superheater stages: a primary superheater (cooler gas) and a secondary or finishing superheater (closest to the furnace, hottest gas).",[78,728,730],{"id":729},"fouling","Fouling",[111,732,733,747,753],{},[114,734,735,741,742,746],{},[59,736,737],{},[63,738,740],{"href":739},"\u002Fglossary\u002Fslagging","Slagging"," on the finishing superheater — semi-molten ash from the ",[63,743,745],{"href":744},"\u002Fglossary\u002Ffurnace","furnace"," deposits on the hottest tubes",[114,748,749,752],{},[59,750,751],{},"Bonded ash"," on the primary superheater — drier deposits that sinter under sustained temperature",[114,754,755,758,759,407,761,67,763,767],{},[59,756,757],{},"Sodium \u002F potassium-rich deposits"," on ",[63,760,66],{"href":65},[63,762,406],{"href":65},[63,764,766],{"href":765},"\u002Fglossary\u002Frecovery-boiler","recovery boilers"," — sticky, low-melting, aggressive",[78,769,338],{"id":337},[56,771,772,773,67,776,778],{},"Steam ",[63,774,775],{"href":611},"sootblowers",[63,777,545],{"href":98}," work together:",[111,780,781,784,792],{},[114,782,783],{},"Sootblowers attack hard slag on the finishing superheater",[114,785,786,787,791],{},"Sonic horns (",[63,788,790],{"href":789},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","60–125 Hz",") keep dry ash from consolidating on the primary superheater and convective superheater",[114,793,794,798,799,802],{},[63,795,797],{"href":796},"\u002Fglossary\u002Finfrasonic-cleaner","Infrasonic cleaners"," below 30 Hz are used on deep ",[63,800,801],{"href":765},"recovery-boiler"," superheater cavities",[56,804,805],{},"The combination extends the interval between major water-washes and reduces steam-attemperation requirements that mask deteriorating heat transfer.",[78,807,137],{"id":136},[111,809,810,816,821,827,831,835],{},[114,811,812],{},[63,813,815],{"href":814},"\u002Fglossary\u002Fboiler","Boiler",[114,817,818],{},[63,819,820],{"href":724},"Convective pass \u002F backpass",[114,822,823],{},[63,824,826],{"href":825},"\u002Fglossary\u002Freheater","Reheater",[114,828,829],{},[63,830,740],{"href":739},[114,832,833],{},[63,834,166],{"href":98},[114,836,837],{},[63,838,840],{"href":839},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",{"title":168,"searchDepth":169,"depth":169,"links":842},[843,844,845],{"id":729,"depth":169,"text":730},{"id":337,"depth":169,"text":338},{"id":136,"depth":169,"text":137},"boiler","A superheater is a tube bank in a boiler's convective pass that raises the steam temperature beyond its saturation point using residual heat from the flue gas. Most utility boilers have at least two superheater stages: a primary superheater (cooler gas) and a secondary or finishing superheater (closest to the furnace, hottest gas).",{},[846,850,851,852,185,853],"convective-pass-backpass","reheater","slagging","sonic-sootblower",{"title":855,"description":856},"Superheater — boiler tube bank that raises steam temperature beyond saturation","A superheater is a tube bank that raises steam temperature beyond the saturation point using flue-gas heat. Sticky alkali ash and slag deposits are the dominant fouling concerns.",[858],{"title":859,"url":860},"Wikipedia — Superheater","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSuperheater","glossary\u002Fsuperheater","hYVXyyVmlWCU3AXfAl0l3YAhHpWty_akkDsBJGC_NDs",{"id":864,"title":166,"aliases":865,"body":868,"category":1065,"description":1066,"extension":177,"meta":1067,"navigation":179,"path":98,"relatedTerms":1068,"seo":1074,"sources":1077,"stem":1087,"term":166,"__hash__":1088},"glossary\u002Fglossary\u002Fsonic-horn.md",[545,866,867],"sonic cleaning horn","industrial sonic horn",{"type":53,"value":869,"toc":1058},[870,900,904,912,916,978,982,1017,1021,1028,1030],[56,871,718,872,875,876,880,881,407,885,407,889,407,892,67,895,899],{},[59,873,874],{},"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 ",[63,877,879],{"href":878},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[63,882,884],{"href":883},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",[63,886,888],{"href":887},"\u002Fglossary\u002Ffabric-filter","baghouses",[63,890,891],{"href":637},"SCR catalysts",[63,893,894],{"href":160},"boiler heat-transfer surfaces",[63,896,898],{"href":897},"\u002Fglossary\u002Fhopper","hoppers and silos",".",[78,901,903],{"id":902},"how-a-sonic-horn-works","How a sonic horn works",[56,905,906,907,911],{},"Compressed plant air admitted through a ",[63,908,910],{"href":909},"\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.",[78,913,915],{"id":914},"key-parameters","Key parameters",[218,917,918,928],{},[221,919,920],{},[224,921,922,925],{},[227,923,924],{},"Parameter",[227,926,927],{},"Typical range",[234,929,930,938,946,954,962,970],{},[224,931,932,935],{},[239,933,934],{},"Fundamental frequency",[239,936,937],{},"60–400 Hz",[224,939,940,943],{},[239,941,942],{},"Sound pressure level",[239,944,945],{},"140–180 dB",[224,947,948,951],{},[239,949,950],{},"Compressed-air consumption",[239,952,953],{},"8–14 Nm³\u002Fmin at 4–7 bar",[224,955,956,959],{},[239,957,958],{},"Operating temperature (with appropriate materials)",[239,960,961],{},"−40 °C to +500 °C",[224,963,964,967],{},[239,965,966],{},"Firing cycle",[239,968,969],{},"5–15 s burst, repeated every 3–15 minutes",[224,971,972,975],{},[239,973,974],{},"Mass",[239,976,977],{},"15–60 kg depending on horn size",[78,979,981],{"id":980},"frequency-selection","Frequency selection",[56,983,984,985,407,989,992,993,407,997,1001,1002,407,1005,1009,1010,67,1013,899],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[63,986,988],{"href":987},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[63,990,991],{"href":765},"recovery-boiler superheaters",", large ",[63,994,996],{"href":995},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[63,998,1000],{"href":999},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[63,1003,1004],{"href":887},"fabric-filter compartments",[63,1006,1008],{"href":1007},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[63,1011,1012],{"href":789},"low-frequency acoustic cleaner",[63,1014,1016],{"href":1015},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[78,1018,1020],{"id":1019},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[56,1022,1023,1024,1027],{},"Sonic horns are increasingly specified alongside or in place of ",[63,1025,1026],{"href":611},"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.",[78,1029,137],{"id":136},[111,1031,1032,1037,1041,1047,1053],{},[114,1033,1034],{},[63,1035,1036],{"href":878},"Acoustic cleaner",[114,1038,1039],{},[63,1040,840],{"href":839},[114,1042,1043],{},[63,1044,1046],{"href":1045},"\u002Fglossary\u002Fbell-horn","Bell horn",[114,1048,1049],{},[63,1050,1052],{"href":1051},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[114,1054,1055],{},[63,1056,1057],{"href":789},"Low-frequency acoustic cleaner",{"title":168,"searchDepth":169,"depth":169,"links":1059},[1060,1061,1062,1063,1064],{"id":902,"depth":169,"text":903},{"id":914,"depth":169,"text":915},{"id":980,"depth":169,"text":981},{"id":1019,"depth":169,"text":1020},{"id":136,"depth":169,"text":137},"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.",{},[1069,1070,853,1071,1072,1073],"acoustic-cleaner","acoustic-cleaning-system","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":1075,"description":1076},"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.",[1078,1081,1084],{"title":1079,"url":1080},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":1082,"url":1083},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":1085,"url":1086},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613759594]