[{"data":1,"prerenderedAt":1082},["ShallowReactive",2],{"site-footer-common":3,"glossary:waste-to-energy":45,"glossary-related:waste-to-energy":266},{"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":53,"category":241,"description":242,"extension":243,"meta":244,"navigation":245,"path":246,"relatedTerms":247,"seo":253,"sources":256,"stem":263,"term":264,"__hash__":265},"glossary\u002Fglossary\u002Fwaste-to-energy.md","Waste-to-energy (WtE \u002F EfW)",[49,50,51,52],"WtE","EfW","energy-from-waste","MSW incineration",{"type":54,"value":55,"toc":234},"minimark",[56,85,113,118,121,150,163,167,202,206],[57,58,59,63,64,68,69,74,75,79,80,84],"p",{},[60,61,62],"strong",{},"Waste-to-energy (WtE)"," — equivalently ",[65,66,67],"em",{},"energy-from-waste (EfW)"," — burns ",[70,71,73],"a",{"href":72},"\u002Fglossary\u002Fmunicipal-solid-waste","municipal solid waste (MSW)",", ",[70,76,78],{"href":77},"\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 ",[70,81,83],{"href":82},"\u002Fglossary\u002Fsonic-horn","sonic horns"," worldwide, driven by:",[86,87,88,95,101,107],"ul",{},[89,90,91,94],"li",{},[60,92,93],{},"EU policy"," — landfill diversion targets, EU ETS extension to WtE from 2028",[89,96,97,100],{},[60,98,99],{},"UK"," — recent tightening of criteria for new WtE plants raises operating-efficiency expectations",[89,102,103,106],{},[60,104,105],{},"EPC pipeline"," — major projects from Hitachi Zosen Inova \u002F Kanadevia Inova, Babcock & Wilcox Vølund, Paprec Énergies, Keppel Seghers, ANDRITZ, Valmet",[89,108,109,112],{},[60,110,111],{},"Operator economics"," — tipping fees underwrite high-availability targets",[114,115,117],"h2",{"id":116},"why-wte-is-uniquely-fouling-prone","Why WtE is uniquely fouling-prone",[57,119,120],{},"Three converging factors make WtE boilers harder to clean than conventional fossil-fuel plants:",[86,122,123,134,144],{},[89,124,125,128,129,133],{},[60,126,127],{},"High chlorine content"," in waste fuels → ",[70,130,132],{"href":131},"\u002Fglossary\u002Fchloride-induced-corrosion","chloride corrosion"," and sticky deposits",[89,135,136,139,140],{},[60,137,138],{},"High alkali content"," (Na, K from food, paper, biomass fractions) → ",[70,141,143],{"href":142},"\u002Fglossary\u002Flow-melt-sticky-ash","low-melt sticky ash",[89,145,146,149],{},[60,147,148],{},"Variable fuel composition"," → unpredictable fouling intensity",[57,151,152,153,157,158,162],{},"Conventional steam ",[70,154,156],{"href":155},"\u002Fglossary\u002Fsteam-sootblower","sootblowing"," accelerates ",[70,159,161],{"href":160},"\u002Fglossary\u002Ftube-erosion-tube-wastage","tube wastage"," on the chloride-rich, low-melt deposits typical of WtE; acoustic cleaning is the safer alternative.",[114,164,166],{"id":165},"where-sonic-horns-sit-in-wte-plants","Where sonic horns sit in WtE plants",[86,168,169,175,186,192,197],{},[89,170,171,174],{},[60,172,173],{},"Boiler convective pass"," — superheater, evaporator, economiser tube banks",[89,176,177,180,181,185],{},[60,178,179],{},"SCR catalyst layers"," — high-dust ",[70,182,184],{"href":183},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR"," on WtE",[89,187,188,191],{},[60,189,190],{},"Flue-gas ducting"," between boiler and treatment train",[89,193,194],{},[60,195,196],{},"Bag-filter compartments and hoppers",[89,198,199],{},[60,200,201],{},"Bottom-ash and fly-ash hoppers",[114,203,205],{"id":204},"related-terms","Related terms",[86,207,208,213,218,224,229],{},[89,209,210],{},[70,211,212],{"href":72},"Municipal solid waste (MSW)",[89,214,215],{},[70,216,217],{"href":77},"RDF \u002F SRF \u002F TDF",[89,219,220],{},[70,221,223],{"href":222},"\u002Fglossary\u002Fgrate-fired-boiler-mass-burn-incinerator","Grate-fired boiler \u002F mass-burn incinerator",[89,225,226],{},[70,227,228],{"href":131},"Chloride-induced corrosion",[89,230,231],{},[70,232,233],{"href":82},"Sonic horn",{"title":235,"searchDepth":236,"depth":236,"links":237},"",2,[238,239,240],{"id":116,"depth":236,"text":117},{"id":165,"depth":236,"text":166},{"id":204,"depth":236,"text":205},"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:","md",{},true,"\u002Fglossary\u002Fwaste-to-energy",[248,249,250,251,252],"municipal-solid-waste","rdf-srf-tdf","grate-fired-boiler-mass-burn-incinerator","chloride-induced-corrosion","sonic-horn",{"title":254,"description":255},"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.",[257,260],{"title":258,"url":259},"Wikipedia — Waste-to-energy","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FWaste-to-energy",{"title":261,"url":262},"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","Waste-to-energy","n1jacm4CfEzWzKgFtb3zWUtawVRCvFMnoypq0mxk6h8",[267,427,596,721,850],{"id":268,"title":212,"aliases":269,"body":273,"category":241,"description":413,"extension":243,"meta":414,"navigation":245,"path":72,"relatedTerms":415,"seo":417,"sources":420,"stem":424,"term":425,"__hash__":426},"glossary\u002Fglossary\u002Fmunicipal-solid-waste.md",[270,271,272],"MSW","household waste","residual waste",{"type":54,"value":274,"toc":408},[275,284,288,371,374,378,387,389],[57,276,277,279,280,283],{},[60,278,212],{}," is mixed household and commercial waste — the primary fuel for mass-burn ",[70,281,282],{"href":246},"waste-to-energy"," plants. Composition varies daily and seasonally with the source catchment area, weather, recycling rates and economic activity, and that variability translates directly into variable fouling behaviour in the boiler.",[114,285,287],{"id":286},"typical-composition-mass","Typical composition (mass %)",[289,290,291,304],"table",{},[292,293,294],"thead",{},[295,296,297,301],"tr",{},[298,299,300],"th",{},"Fraction",[298,302,303],{},"Approximate share",[305,306,307,316,324,332,340,348,356,364],"tbody",{},[295,308,309,313],{},[310,311,312],"td",{},"Paper and card",[310,314,315],{},"20–30%",[295,317,318,321],{},[310,319,320],{},"Food waste",[310,322,323],{},"15–25%",[295,325,326,329],{},[310,327,328],{},"Plastics",[310,330,331],{},"10–15%",[295,333,334,337],{},[310,335,336],{},"Wood and garden waste",[310,338,339],{},"5–15%",[295,341,342,345],{},[310,343,344],{},"Textiles",[310,346,347],{},"3–7%",[295,349,350,353],{},[310,351,352],{},"Glass",[310,354,355],{},"3–8%",[295,357,358,361],{},[310,359,360],{},"Metals",[310,362,363],{},"2–5%",[295,365,366,369],{},[310,367,368],{},"Inerts \u002F fines",[310,370,339],{},[57,372,373],{},"The plastics fraction is the dominant source of chlorine, the food fraction contributes alkali and moisture, and the inerts pass through as bottom ash.",[114,375,377],{"id":376},"composition-variability-and-operations","Composition variability and operations",[57,379,380,381,383,384,386],{},"WtE operators see daily swings of 10–20% in calorific value and 30%+ in chlorine loading. This variability defeats steady-state combustion control and produces episodic ",[70,382,143],{"href":142}," events. Active ",[70,385,252],{"href":82}," cleaning that can ride through these events without operator intervention is one of the underlying reasons acoustic horns are increasingly the default cleaning specification on new WtE plants.",[114,388,205],{"id":204},[86,390,391,395,399,403],{},[89,392,393],{},[70,394,264],{"href":246},[89,396,397],{},[70,398,217],{"href":77},[89,400,401],{},[70,402,223],{"href":222},[89,404,405],{},[70,406,407],{"href":142},"Low-melt sticky ash",{"title":235,"searchDepth":236,"depth":236,"links":409},[410,411,412],{"id":286,"depth":236,"text":287},{"id":376,"depth":236,"text":377},{"id":204,"depth":236,"text":205},"Municipal solid waste (MSW) is mixed household and commercial waste — the primary fuel for mass-burn waste-to-energy plants. Composition varies daily and seasonally with the source catchment area, weather, recycling rates and economic activity, and that variability translates directly into variable fouling behaviour in the boiler.",{},[282,249,250,416],"low-melt-sticky-ash",{"title":418,"description":419},"Municipal solid waste (MSW) — household and commercial waste as boiler fuel","MSW is mixed household and commercial waste — the primary fuel for mass-burn WtE plants. Variable composition produces variable fouling and ash chemistry.",[421],{"title":422,"url":423},"Wikipedia — Municipal solid waste","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FMunicipal_solid_waste","glossary\u002Fmunicipal-solid-waste","Municipal solid waste","3__oVHZu8gXIV0vsizj806gZP5gLiYK7SEWOviQUFQo",{"id":428,"title":217,"aliases":429,"body":436,"category":581,"description":582,"extension":243,"meta":583,"navigation":245,"path":77,"relatedTerms":584,"seo":587,"sources":590,"stem":594,"term":78,"__hash__":595},"glossary\u002Fglossary\u002Frdf-srf-tdf.md",[430,431,432,433,434,435],"refuse-derived fuel","solid recovered fuel","tyre-derived fuel","RDF","SRF","TDF",{"type":54,"value":437,"toc":576},[438,456,524,528,545,549,557,559],[57,439,440,74,442,444,445,447,448,452,453,455],{},[60,441,433],{},[60,443,434],{}," and ",[60,446,435],{}," are the three dominant waste-derived ",[70,449,451],{"href":450},"\u002Fglossary\u002Falternative-fuel","alternative fuels"," used in cement kilns, ",[70,454,282],{"href":246}," plants and industrial boilers.",[289,457,458,474],{},[292,459,460],{},[295,461,462,465,468,471],{},[298,463,464],{},"Fuel",[298,466,467],{},"Source",[298,469,470],{},"Specification",[298,472,473],{},"Calorific value",[305,475,476,492,508],{},[295,477,478,483,486,489],{},[310,479,480,482],{},[60,481,433],{}," (Refuse-Derived Fuel)",[310,484,485],{},"Municipal solid waste, lightly processed",[310,487,488],{},"Loose, no formal CEN\u002FTS specification",[310,490,491],{},"12–18 MJ\u002Fkg",[295,493,494,499,502,505],{},[310,495,496,498],{},[60,497,434],{}," (Solid Recovered Fuel)",[310,500,501],{},"MSW + commercial waste, processed to CEN\u002FTS 15359 spec",[310,503,504],{},"Defined particle size, ash content, calorific value, Cl, Hg",[310,506,507],{},"15–20 MJ\u002Fkg",[295,509,510,515,518,521],{},[310,511,512,514],{},[60,513,435],{}," (Tyre-Derived Fuel)",[310,516,517],{},"End-of-life tyres, shredded",[310,519,520],{},"Shred-size grade or whole-tyre",[310,522,523],{},"28–35 MJ\u002Fkg",[114,525,527],{"id":526},"trade-offs","Trade-offs",[86,529,530,535,540],{},[89,531,532,534],{},[60,533,433],{},": cheap, high availability, variable composition; high chlorine swings",[89,536,537,539],{},[60,538,434],{},": more consistent and predictable than RDF; commands premium gate fees",[89,541,542,544],{},[60,543,435],{},": very high calorific value, supplies iron and sulphur to clinker chemistry; rubber-handling logistics",[114,546,548],{"id":547},"fouling-implications","Fouling implications",[57,550,551,552,556],{},"All three add chlorine, sulphur and alkali metals beyond what fossil coal contributes. The chloride loading from chlorinated plastics in RDF \u002F SRF is the dominant driver of ",[70,553,555],{"href":554},"\u002Fglossary\u002Fchloride-bypass","chloride-bypass"," sizing. TDF adds zinc and iron oxides that can affect clinker chemistry.",[114,558,205],{"id":204},[86,560,561,566,572],{},[89,562,563],{},[70,564,565],{"href":450},"Alternative fuel (AFR)",[89,567,568],{},[70,569,571],{"href":570},"\u002Fglossary\u002Fthermal-substitution-rate","Thermal substitution rate (TSR)",[89,573,574],{},[70,575,264],{"href":246},{"title":235,"searchDepth":236,"depth":236,"links":577},[578,579,580],{"id":526,"depth":236,"text":527},{"id":547,"depth":236,"text":548},{"id":204,"depth":236,"text":205},"cement","RDF, SRF and TDF are the three dominant waste-derived alternative fuels used in cement kilns, waste-to-energy plants and industrial boilers.",{},[585,586,282],"alternative-fuel","thermal-substitution-rate",{"title":588,"description":589},"RDF, SRF and TDF — the three main waste-derived alternative fuels","RDF (refuse-derived fuel), SRF (solid recovered fuel, higher spec) and TDF (tyre-derived fuel) are the three dominant waste-derived alternative fuels for cement kilns and WtE boilers.",[591],{"title":592,"url":593},"Wikipedia — Refuse-derived fuel","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FRefuse-derived_fuel","glossary\u002Frdf-srf-tdf","RoQpf87g_jG3WY3RTYBUUo8tH9DaZr_5iiSblH89SVk",{"id":597,"title":223,"aliases":598,"body":602,"category":241,"description":708,"extension":243,"meta":709,"navigation":245,"path":222,"relatedTerms":710,"seo":713,"sources":716,"stem":718,"term":719,"__hash__":720},"glossary\u002Fglossary\u002Fgrate-fired-boiler-mass-burn-incinerator.md",[599,600,601],"grate-fired boiler","moving-grate incinerator","mass-burn incinerator",{"type":54,"value":603,"toc":702},[604,625,629,651,655,670,674,680,682],[57,605,606,607,609,610,612,613,615,616,619,620,624],{},"A ",[60,608,599],{}," (also ",[65,611,600],{}," or ",[65,614,601],{},") burns mixed ",[70,617,618],{"href":72},"municipal solid waste"," on a slowly moving grate without significant fuel pre-processing. As waste advances along the grate, it dries, ignites, burns out, and finally discharges as ",[70,621,623],{"href":622},"\u002Fglossary\u002Fincinerator-bottom-ash","bottom ash",". Mass-burn is the dominant design for municipal WtE plants worldwide.",[114,626,628],{"id":627},"why-mass-burn-dominates-municipal-duty","Why mass-burn dominates municipal duty",[86,630,631,634,637,640,648],{},[89,632,633],{},"Tolerates unprocessed mixed waste",[89,635,636],{},"Simple fuel handling — no shredding or pelletising needed",[89,638,639],{},"Mature, robust, well-supported supply chain",[89,641,642,643,647],{},"Established regulatory acceptance under ",[70,644,646],{"href":645},"\u002Fglossary\u002Findustrial-emissions-directive","IED"," and equivalent",[89,649,650],{},"Scales from 50 t\u002Fday local plants to 3,000+ t\u002Fday urban facilities",[114,652,654],{"id":653},"where-fluidised-bed-designs-compete","Where fluidised-bed designs compete",[57,656,657,444,661,665,666,669],{},[70,658,660],{"href":659},"\u002Fglossary\u002Fcfb-boiler","CFB",[70,662,664],{"href":663},"\u002Fglossary\u002Fbfb-boiler","BFB"," designs compete with mass-burn for specific duties — pre-sorted ",[70,667,668],{"href":77},"RDF\u002FSRF",", sewage sludge co-firing, biomass-only plants. Fluidised beds need more fuel preparation but offer lower NOx and better fuel flexibility.",[114,671,673],{"id":672},"cleaning","Cleaning",[57,675,676,677,679],{},"Grate-fired WtE boilers benefit from ",[70,678,83],{"href":82}," on the convective pass, ESP\u002Fbaghouse hoppers and SCR. The fluidised-bed alternatives add cyclone-cleaning duty to the same list.",[114,681,205],{"id":204},[86,683,684,688,692,697],{},[89,685,686],{},[70,687,264],{"href":246},[89,689,690],{},[70,691,212],{"href":72},[89,693,694],{},[70,695,696],{"href":663},"BFB boiler",[89,698,699],{},[70,700,701],{"href":659},"CFB boiler",{"title":235,"searchDepth":236,"depth":236,"links":703},[704,705,706,707],{"id":627,"depth":236,"text":628},{"id":653,"depth":236,"text":654},{"id":672,"depth":236,"text":673},{"id":204,"depth":236,"text":205},"A grate-fired boiler (also moving-grate incinerator or mass-burn incinerator) burns mixed municipal solid waste on a slowly moving grate without significant fuel pre-processing. As waste advances along the grate, it dries, ignites, burns out, and finally discharges as bottom ash. Mass-burn is the dominant design for municipal WtE plants worldwide.",{},[282,248,711,712],"bfb-boiler","cfb-boiler",{"title":714,"description":715},"Grate-fired boiler — moving-grate WtE design that dominates municipal waste burning","Grate-fired (mass-burn) WtE boilers burn MSW on a moving grate without fuel pre-processing. The dominant design for municipal waste incineration.",[717],{"title":258,"url":259},"glossary\u002Fgrate-fired-boiler-mass-burn-incinerator","Grate-fired boiler and mass-burn incinerator","V-3wHrFBgxJiD2Am-W-xgmaBL4P57FNupmZusnxi0Ws",{"id":722,"title":228,"aliases":723,"body":726,"category":241,"description":835,"extension":243,"meta":836,"navigation":245,"path":131,"relatedTerms":837,"seo":841,"sources":844,"stem":848,"term":228,"__hash__":849},"glossary\u002Fglossary\u002Fchloride-induced-corrosion.md",[724,132,725],"Cl corrosion","high-temperature chloride corrosion",{"type":54,"value":727,"toc":829},[728,739,743,746,750,768,772,800,802],[57,729,730,732,733,74,735,738],{},[60,731,228],{}," is the accelerated tube-wall thinning caused by chlorine-rich deposits on the steam-side surfaces of ",[70,734,49],{"href":246},[70,736,737],{"href":246},"biomass"," and waste-fired boilers. Chloride corrosion is the dominant tube-failure mechanism in WtE and a major maintenance cost driver.",[114,740,742],{"id":741},"mechanism","Mechanism",[57,744,745],{},"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.",[114,747,749],{"id":748},"where-it-dominates","Where it dominates",[86,751,752,755,762,765],{},[89,753,754],{},"WtE superheaters — design temperatures kept low (380–420 °C) specifically to limit chloride corrosion",[89,756,757,758],{},"Straw-fired boilers — see ",[70,759,761],{"href":760},"\u002Fglossary\u002Fstraw-agricultural-residue-firing","straw firing",[89,763,764],{},"RDF \u002F SRF boilers — variable but generally high",[89,766,767],{},"Heavy-petroleum-fired boilers with chloride contamination",[114,769,771],{"id":770},"mitigation","Mitigation",[86,773,774,780,786,792],{},[89,775,776,779],{},[60,777,778],{},"Material selection"," — Inconel-625 weld overlays, nickel-based alloys on the most-exposed tubes",[89,781,782,785],{},[60,783,784],{},"Lower steam temperature"," at the superheater outlet to keep tube-metal below the corrosion threshold",[89,787,788,791],{},[60,789,790],{},"Fuel control"," — limit chloride loading where the contract permits",[89,793,794,799],{},[60,795,796],{},[70,797,798],{"href":82},"Sonic horns"," — preventing deposits from consolidating reduces the chloride concentration immediately adjacent to the tube surface, indirectly slowing corrosion",[114,801,205],{"id":204},[86,803,804,808,814,818,824],{},[89,805,806],{},[70,807,264],{"href":246},[89,809,810],{},[70,811,813],{"href":812},"\u002Fglossary\u002Falkali-metals-in-ash","Alkali metals in ash",[89,815,816],{},[70,817,407],{"href":142},[89,819,820],{},[70,821,823],{"href":822},"\u002Fglossary\u002Fcold-end-corrosion-dew-point-corrosion","Cold-end corrosion \u002F dew-point corrosion",[89,825,826],{},[70,827,828],{"href":160},"Tube erosion \u002F tube wastage",{"title":235,"searchDepth":236,"depth":236,"links":830},[831,832,833,834],{"id":741,"depth":236,"text":742},{"id":748,"depth":236,"text":749},{"id":770,"depth":236,"text":771},{"id":204,"depth":236,"text":205},"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.",{},[282,838,416,839,840],"alkali-metals-in-ash","cold-end-corrosion-dew-point-corrosion","tube-erosion-tube-wastage",{"title":842,"description":843},"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.",[845],{"title":846,"url":847},"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":851,"title":233,"aliases":852,"body":855,"category":1057,"description":1058,"extension":243,"meta":1059,"navigation":245,"path":82,"relatedTerms":1060,"seo":1067,"sources":1070,"stem":1080,"term":233,"__hash__":1081},"glossary\u002Fglossary\u002Fsonic-horn.md",[83,853,854],"sonic cleaning horn","industrial sonic horn",{"type":54,"value":856,"toc":1050},[857,888,892,900,904,966,970,1007,1011,1018,1020],[57,858,606,859,862,863,867,868,74,872,74,876,74,879,444,883,887],{},[60,860,861],{},"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 ",[70,864,866],{"href":865},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[70,869,871],{"href":870},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",[70,873,875],{"href":874},"\u002Fglossary\u002Ffabric-filter","baghouses",[70,877,878],{"href":183},"SCR catalysts",[70,880,882],{"href":881},"\u002Fglossary\u002Fsuperheater","boiler heat-transfer surfaces",[70,884,886],{"href":885},"\u002Fglossary\u002Fhopper","hoppers and silos",".",[114,889,891],{"id":890},"how-a-sonic-horn-works","How a sonic horn works",[57,893,894,895,899],{},"Compressed plant air admitted through a ",[70,896,898],{"href":897},"\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.",[114,901,903],{"id":902},"key-parameters","Key parameters",[289,905,906,916],{},[292,907,908],{},[295,909,910,913],{},[298,911,912],{},"Parameter",[298,914,915],{},"Typical range",[305,917,918,926,934,942,950,958],{},[295,919,920,923],{},[310,921,922],{},"Fundamental frequency",[310,924,925],{},"60–400 Hz",[295,927,928,931],{},[310,929,930],{},"Sound pressure level",[310,932,933],{},"140–180 dB",[295,935,936,939],{},[310,937,938],{},"Compressed-air consumption",[310,940,941],{},"8–14 Nm³\u002Fmin at 4–7 bar",[295,943,944,947],{},[310,945,946],{},"Operating temperature (with appropriate materials)",[310,948,949],{},"−40 °C to +500 °C",[295,951,952,955],{},[310,953,954],{},"Firing cycle",[310,956,957],{},"5–15 s burst, repeated every 3–15 minutes",[295,959,960,963],{},[310,961,962],{},"Mass",[310,964,965],{},"15–60 kg depending on horn size",[114,967,969],{"id":968},"frequency-selection","Frequency selection",[57,971,972,973,74,977,981,982,74,986,990,991,74,994,998,999,444,1003,887],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[70,974,976],{"href":975},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[70,978,980],{"href":979},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters",", large ",[70,983,985],{"href":984},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[70,987,989],{"href":988},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[70,992,993],{"href":874},"fabric-filter compartments",[70,995,997],{"href":996},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[70,1000,1002],{"href":1001},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[70,1004,1006],{"href":1005},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[114,1008,1010],{"id":1009},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[57,1012,1013,1014,1017],{},"Sonic horns are increasingly specified alongside or in place of ",[70,1015,1016],{"href":155},"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.",[114,1019,205],{"id":204},[86,1021,1022,1027,1033,1039,1045],{},[89,1023,1024],{},[70,1025,1026],{"href":865},"Acoustic cleaner",[89,1028,1029],{},[70,1030,1032],{"href":1031},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[89,1034,1035],{},[70,1036,1038],{"href":1037},"\u002Fglossary\u002Fbell-horn","Bell horn",[89,1040,1041],{},[70,1042,1044],{"href":1043},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[89,1046,1047],{},[70,1048,1049],{"href":1001},"Low-frequency acoustic cleaner",{"title":235,"searchDepth":236,"depth":236,"links":1051},[1052,1053,1054,1055,1056],{"id":890,"depth":236,"text":891},{"id":902,"depth":236,"text":903},{"id":968,"depth":236,"text":969},{"id":1009,"depth":236,"text":1010},{"id":204,"depth":236,"text":205},"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.",{},[1061,1062,1063,1064,1065,1066],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":1068,"description":1069},"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.",[1071,1074,1077],{"title":1072,"url":1073},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":1075,"url":1076},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":1078,"url":1079},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613760432]