[{"data":1,"prerenderedAt":790},["ShallowReactive",2],{"site-footer-common":3,"glossary:apc-residue":45,"glossary-related:apc-residue":172},{"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":152,"description":153,"extension":154,"meta":155,"navigation":156,"path":157,"relatedTerms":158,"seo":162,"sources":165,"stem":169,"term":170,"__hash__":171},"glossary\u002Fglossary\u002Fapc-residue.md","APC residue",[47,49,50,51],"APCr","WtE fly ash","air pollution control residue",{"type":53,"value":54,"toc":145},"minimark",[55,73,78,81,97,101,119,123],[56,57,58,61,62,67,68,72],"p",{},[59,60,47],"strong",{}," (air-pollution-control residue, or APCr) is the fine fly-ash combined with reagent salts (calcium hydroxide, activated carbon, sodium bicarbonate) captured by the flue-gas-treatment train downstream of a ",[63,64,66],"a",{"href":65},"\u002Fglossary\u002Fwaste-to-energy","WtE"," boiler. APC residue typically accounts for 2–5% of original waste mass — much less than ",[63,69,71],{"href":70},"\u002Fglossary\u002Fincinerator-bottom-ash","incinerator bottom ash (IBA)",", but more hazardous because heavy metals (Hg, Pb, Cd) and dioxins concentrate here.",[74,75,77],"h2",{"id":76},"classification-and-disposal","Classification and disposal",[56,79,80],{},"In the EU and UK, APC residue is classified as hazardous waste. Disposal routes include:",[82,83,84,88,91,94],"ul",{},[85,86,87],"li",{},"Stabilisation and landfilling in specialised hazardous-waste facilities",[85,89,90],{},"Underground storage (former salt mines in Germany)",[85,92,93],{},"Treatment for partial reuse in construction materials",[85,95,96],{},"Specialised commercial processing for metals recovery",[74,98,100],{"id":99},"sonic-horn-relevance","Sonic-horn relevance",[56,102,103,104,108,109,113,114,118],{},"APC residue is collected in ",[63,105,107],{"href":106},"\u002Fglossary\u002Ffly-ash-hopper","fly-ash hoppers"," below the boiler economiser, SCR, ",[63,110,112],{"href":111},"\u002Fglossary\u002Fbaghouse","baghouse"," and any reagent-injection equipment. Hopper bridging is a frequent problem because APC residue is fine, sticky and partly hygroscopic. ",[63,115,117],{"href":116},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," on APC-residue hoppers are routine specification on modern WtE plants.",[74,120,122],{"id":121},"related-terms","Related terms",[82,124,125,130,135,140],{},[85,126,127],{},[63,128,129],{"href":65},"Waste-to-energy",[85,131,132],{},[63,133,134],{"href":70},"Incinerator bottom ash (IBA)",[85,136,137],{},[63,138,139],{"href":111},"Baghouse",[85,141,142],{},[63,143,144],{"href":106},"Fly-ash hopper",{"title":146,"searchDepth":147,"depth":147,"links":148},"",2,[149,150,151],{"id":76,"depth":147,"text":77},{"id":99,"depth":147,"text":100},{"id":121,"depth":147,"text":122},"wte-biomass","APC residue (air-pollution-control residue, or APCr) is the fine fly-ash combined with reagent salts (calcium hydroxide, activated carbon, sodium bicarbonate) captured by the flue-gas-treatment train downstream of a WtE boiler. APC residue typically accounts for 2–5% of original waste mass — much less than incinerator bottom ash (IBA), but more hazardous because heavy metals (Hg, Pb, Cd) and dioxins concentrate here.","md",{},true,"\u002Fglossary\u002Fapc-residue",[159,160,112,161],"waste-to-energy","incinerator-bottom-ash","fly-ash-hopper",{"title":163,"description":164},"APC residue — hazardous fly-ash fraction captured downstream of WtE boilers","APC residue is the fine fly-ash plus reagent salts captured by the WtE flue-gas treatment train. Classified as hazardous waste; requires specialised disposal.",[166],{"title":167,"url":168},"Wikipedia — Waste-to-energy","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FWaste-to-energy","glossary\u002Fapc-residue","Air-pollution-control residue","Dq9DWR0zY4FpNpHASpSopELBE2o4Tc-9UH0A64hzf2g",[173,374,465,589],{"id":174,"title":175,"aliases":176,"body":180,"category":152,"description":356,"extension":154,"meta":357,"navigation":156,"path":65,"relatedTerms":358,"seo":364,"sources":367,"stem":372,"term":129,"__hash__":373},"glossary\u002Fglossary\u002Fwaste-to-energy.md","Waste-to-energy (WtE \u002F EfW)",[66,177,178,179],"EfW","energy-from-waste","MSW incineration",{"type":53,"value":181,"toc":351},[182,207,233,237,240,269,282,286,321,323],[56,183,184,187,188,192,193,197,198,202,203,206],{},[59,185,186],{},"Waste-to-energy (WtE)"," — equivalently ",[189,190,191],"em",{},"energy-from-waste (EfW)"," — burns ",[63,194,196],{"href":195},"\u002Fglossary\u002Fmunicipal-solid-waste","municipal solid waste (MSW)",", ",[63,199,201],{"href":200},"\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 ",[63,204,205],{"href":116},"sonic horns"," worldwide, driven by:",[82,208,209,215,221,227],{},[85,210,211,214],{},[59,212,213],{},"EU policy"," — landfill diversion targets, EU ETS extension to WtE from 2028",[85,216,217,220],{},[59,218,219],{},"UK"," — recent tightening of criteria for new WtE plants raises operating-efficiency expectations",[85,222,223,226],{},[59,224,225],{},"EPC pipeline"," — major projects from Hitachi Zosen Inova \u002F Kanadevia Inova, Babcock & Wilcox Vølund, Paprec Énergies, Keppel Seghers, ANDRITZ, Valmet",[85,228,229,232],{},[59,230,231],{},"Operator economics"," — tipping fees underwrite high-availability targets",[74,234,236],{"id":235},"why-wte-is-uniquely-fouling-prone","Why WtE is uniquely fouling-prone",[56,238,239],{},"Three converging factors make WtE boilers harder to clean than conventional fossil-fuel plants:",[82,241,242,253,263],{},[85,243,244,247,248,252],{},[59,245,246],{},"High chlorine content"," in waste fuels → ",[63,249,251],{"href":250},"\u002Fglossary\u002Fchloride-induced-corrosion","chloride corrosion"," and sticky deposits",[85,254,255,258,259],{},[59,256,257],{},"High alkali content"," (Na, K from food, paper, biomass fractions) → ",[63,260,262],{"href":261},"\u002Fglossary\u002Flow-melt-sticky-ash","low-melt sticky ash",[85,264,265,268],{},[59,266,267],{},"Variable fuel composition"," → unpredictable fouling intensity",[56,270,271,272,276,277,281],{},"Conventional steam ",[63,273,275],{"href":274},"\u002Fglossary\u002Fsteam-sootblower","sootblowing"," accelerates ",[63,278,280],{"href":279},"\u002Fglossary\u002Ftube-erosion-tube-wastage","tube wastage"," on the chloride-rich, low-melt deposits typical of WtE; acoustic cleaning is the safer alternative.",[74,283,285],{"id":284},"where-sonic-horns-sit-in-wte-plants","Where sonic horns sit in WtE plants",[82,287,288,294,305,311,316],{},[85,289,290,293],{},[59,291,292],{},"Boiler convective pass"," — superheater, evaporator, economiser tube banks",[85,295,296,299,300,304],{},[59,297,298],{},"SCR catalyst layers"," — high-dust ",[63,301,303],{"href":302},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR"," on WtE",[85,306,307,310],{},[59,308,309],{},"Flue-gas ducting"," between boiler and treatment train",[85,312,313],{},[59,314,315],{},"Bag-filter compartments and hoppers",[85,317,318],{},[59,319,320],{},"Bottom-ash and fly-ash hoppers",[74,322,122],{"id":121},[82,324,325,330,335,341,346],{},[85,326,327],{},[63,328,329],{"href":195},"Municipal solid waste (MSW)",[85,331,332],{},[63,333,334],{"href":200},"RDF \u002F SRF \u002F TDF",[85,336,337],{},[63,338,340],{"href":339},"\u002Fglossary\u002Fgrate-fired-boiler-mass-burn-incinerator","Grate-fired boiler \u002F mass-burn incinerator",[85,342,343],{},[63,344,345],{"href":250},"Chloride-induced corrosion",[85,347,348],{},[63,349,350],{"href":116},"Sonic horn",{"title":146,"searchDepth":147,"depth":147,"links":352},[353,354,355],{"id":235,"depth":147,"text":236},{"id":284,"depth":147,"text":285},{"id":121,"depth":147,"text":122},"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:",{},[359,360,361,362,363],"municipal-solid-waste","rdf-srf-tdf","grate-fired-boiler-mass-burn-incinerator","chloride-induced-corrosion","sonic-horn",{"title":365,"description":366},"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.",[368,369],{"title":167,"url":168},{"title":370,"url":371},"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":375,"title":134,"aliases":376,"body":379,"category":152,"description":451,"extension":154,"meta":452,"navigation":156,"path":70,"relatedTerms":453,"seo":455,"sources":458,"stem":462,"term":463,"__hash__":464},"glossary\u002Fglossary\u002Fincinerator-bottom-ash.md",[377,378],"IBA","bottom ash (WtE)",{"type":53,"value":380,"toc":446},[381,390,394,397,417,425,427,430,432],[56,382,383,385,386,389],{},[59,384,134],{}," is the non-combustible residue discharged from the bottom of a ",[63,387,388],{"href":339},"grate-fired WtE boiler",". IBA accounts for ~20–25% of the original waste mass and consists of glass, ceramics, metals, fused inorganics and small quantities of unburned organics.",[74,391,393],{"id":392},"recovery-and-reuse","Recovery and reuse",[56,395,396],{},"IBA is increasingly processed rather than landfilled:",[82,398,399,405,411],{},[85,400,401,404],{},[59,402,403],{},"Metal recovery"," — magnetic and eddy-current separation extracts ferrous and non-ferrous metals (typically 8–12% of IBA mass)",[85,406,407,410],{},[59,408,409],{},"Aggregate use"," — the processed mineral fraction is used as secondary aggregate in road sub-base, concrete blocks and other applications",[85,412,413,416],{},[59,414,415],{},"Landfill"," — residual material that fails leaching tests goes to landfill",[56,418,419,420,424],{},"Distinguish IBA from ",[59,421,422],{},[63,423,47],{"href":157}," (air-pollution-control residue), which is the much smaller but more hazardous fraction captured from the flue gas downstream of the boiler.",[74,426,100],{"id":99},[56,428,429],{},"IBA itself is not a sonic-horn target — it is wet, coarse, and gravity-discharged. The associated bottom-ash conveyors and downstream metal-recovery processing hoppers occasionally benefit from acoustic flow aids.",[74,431,122],{"id":121},[82,433,434,438,442],{},[85,435,436],{},[63,437,129],{"href":65},[85,439,440],{},[63,441,340],{"href":339},[85,443,444],{},[63,445,47],{"href":157},{"title":146,"searchDepth":147,"depth":147,"links":447},[448,449,450],{"id":392,"depth":147,"text":393},{"id":99,"depth":147,"text":100},{"id":121,"depth":147,"text":122},"Incinerator bottom ash (IBA) is the non-combustible residue discharged from the bottom of a grate-fired WtE boiler. IBA accounts for ~20–25% of the original waste mass and consists of glass, ceramics, metals, fused inorganics and small quantities of unburned organics.",{},[159,361,454],"apc-residue",{"title":456,"description":457},"Incinerator bottom ash (IBA) — non-combustible residue from WtE grates","IBA is the non-combustible residue discharged from the bottom of a WtE grate-fired boiler. Mostly inert; can be processed for aggregate reuse or landfilled.",[459],{"title":460,"url":461},"Wikipedia — Bottom ash","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBottom_ash","glossary\u002Fincinerator-bottom-ash","Incinerator bottom ash","glqcn8ZzxPjPupnH6Z_dJs4bu0dfKUCrg2NSAhxMHis",{"id":466,"title":139,"aliases":467,"body":471,"category":112,"description":573,"extension":154,"meta":574,"navigation":156,"path":111,"relatedTerms":575,"seo":580,"sources":583,"stem":587,"term":139,"__hash__":588},"glossary\u002Fglossary\u002Fbaghouse.md",[468,469,470],"baghouses","bag filter house","dust collector house",{"type":53,"value":472,"toc":568},[473,493,497,508,512,515,532,534],[56,474,475,476,478,479,197,483,487,488,492],{},"A ",[59,477,112],{}," is the structural enclosure that houses the bags, cages, cleaning system, ",[63,480,482],{"href":481},"\u002Fglossary\u002Ftubesheet","tubesheet",[63,484,486],{"href":485},"\u002Fglossary\u002Fplenum-clean-side-dirty-side","plenums"," and hoppers of a ",[63,489,491],{"href":490},"\u002Fglossary\u002Ffabric-filter","fabric-filter"," dust collector. The word is used in both broad (\"the plant has a 12-compartment baghouse\") and narrow (\"a baghouse is the housing, the fabric filter is the system\") senses; in everyday industry practice the two terms overlap.",[74,494,496],{"id":495},"compartmented-design","Compartmented design",[56,498,499,500,504,505,507],{},"Large industrial baghouses are subdivided into several compartments — each with its own gas-flow damper — so that one compartment can be isolated for offline cleaning or bag replacement while the rest stay online. The standard ",[63,501,503],{"href":502},"\u002Fglossary\u002Fpulse-jet-baghouse","pulse-jet"," compartment count for utility duty is 8–16; cement and ",[63,506,66],{"href":65}," baghouses may run 20+.",[74,509,511],{"id":510},"why-sonic-horns-help","Why sonic horns help",[56,513,514],{},"Sonic horns mounted at compartment level address fouling that the primary cleaning system (pulse-jet, reverse-air or shaker) cannot reach:",[82,516,517,520,526,529],{},[85,518,519],{},"Bag-row dead zones at the back of the compartment",[85,521,522,525],{},[63,523,524],{"href":481},"Tubesheet"," area dust deposits",[85,527,528],{},"Hopper bridging below the bags",[85,530,531],{},"Inlet-plenum dust dropout",[74,533,122],{"id":121},[82,535,536,541,546,552,558,564],{},[85,537,538],{},[63,539,540],{"href":490},"Fabric filter",[85,542,543],{},[63,544,545],{"href":502},"Pulse-jet baghouse",[85,547,548],{},[63,549,551],{"href":550},"\u002Fglossary\u002Freverse-air-baghouse","Reverse-air baghouse",[85,553,554],{},[63,555,557],{"href":556},"\u002Fglossary\u002Fshaker-baghouse","Shaker baghouse",[85,559,560],{},[63,561,563],{"href":562},"\u002Fglossary\u002Fcompartment-isolation","Compartment isolation",[85,565,566],{},[63,567,350],{"href":116},{"title":146,"searchDepth":147,"depth":147,"links":569},[570,571,572],{"id":495,"depth":147,"text":496},{"id":510,"depth":147,"text":511},{"id":121,"depth":147,"text":122},"A baghouse is the structural enclosure that houses the bags, cages, cleaning system, tubesheet, plenums and hoppers of a fabric-filter dust collector. The word is used in both broad (\"the plant has a 12-compartment baghouse\") and narrow (\"a baghouse is the housing, the fabric filter is the system\") senses; in everyday industry practice the two terms overlap.",{},[491,576,577,578,579,363],"pulse-jet-baghouse","reverse-air-baghouse","shaker-baghouse","compartment-isolation",{"title":581,"description":582},"Baghouse — vessel that houses fabric-filter bags for industrial dust control","A baghouse is the structural enclosure that holds the bags, cages, tubesheet, cleaning system and hoppers of a fabric-filter dust collector. Sized in compartments for online isolation.",[584],{"title":585,"url":586},"Wikipedia — Baghouse","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBaghouse","glossary\u002Fbaghouse","TraeRQp5lNGOrkFkwjsoYRrhIIRrMkFonwryXyc1wGw",{"id":590,"title":144,"aliases":591,"body":594,"category":774,"description":775,"extension":154,"meta":776,"navigation":156,"path":106,"relatedTerms":777,"seo":781,"sources":784,"stem":788,"term":144,"__hash__":789},"glossary\u002Fglossary\u002Ffly-ash-hopper.md",[592,593],"fly ash hopper","ash hopper",{"type":53,"value":595,"toc":769},[596,627,631,634,638,641,734,736],[56,597,475,598,601,602,197,606,197,608,612,613,617,618,197,622,626],{},[59,599,600],{},"fly-ash hopper"," is any inverted-pyramid or trough-shaped vessel that collects particulate ash from a combustion plant's flue-gas-cleaning equipment — ",[63,603,605],{"href":604},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",[63,607,468],{"href":490},[63,609,611],{"href":610},"\u002Fglossary\u002Feconomiser","economiser"," hoppers, ",[63,614,616],{"href":615},"\u002Fglossary\u002Fair-heater","air-heater"," hoppers, duct dropouts. Fly-ash hoppers across the gas-path system are notorious for ",[63,619,621],{"href":620},"\u002Fglossary\u002Fbridging","bridging",[63,623,625],{"href":624},"\u002Fglossary\u002Frat-holing","rat-holing"," and pluggage.",[74,628,630],{"id":629},"why-fly-ash-bridges","Why fly ash bridges",[56,632,633],{},"Dry fly ash is a Geldart-C type powder — fine, cohesive, and prone to forming stable arches across narrowing geometries. Cohesion increases with moisture pickup, condensation at the cold end, residual unburnt carbon and chemical composition (high CaO ashes from biomass and lime are especially sticky). Once an arch forms, it tends to consolidate under continued dust accumulation above it.",[74,635,637],{"id":636},"sonic-horns-vs-air-cannons-on-fly-ash-hoppers","Sonic horns vs air cannons on fly-ash hoppers",[56,639,640],{},"The two technologies compete head-to-head:",[642,643,644,664],"table",{},[645,646,647],"thead",{},[648,649,650,654,658],"tr",{},[651,652,653],"th",{},"Attribute",[651,655,656],{},[63,657,350],{"href":116},[651,659,660],{},[63,661,663],{"href":662},"\u002Fglossary\u002Fair-cannon-air-blaster","Air cannon",[665,666,667,679,690,701,712,723],"tbody",{},[648,668,669,673,676],{},[670,671,672],"td",{},"Mechanism",[670,674,675],{},"Continuous low-amplitude vibration",[670,677,678],{},"Periodic high-pressure blast",[648,680,681,684,687],{},[670,682,683],{},"Coverage",[670,685,686],{},"Whole hopper volume from one unit",[670,688,689],{},"Localised to the cannon nozzle",[648,691,692,695,698],{},[670,693,694],{},"Structural stress",[670,696,697],{},"None",[670,699,700],{},"Significant; fatigue cracking documented",[648,702,703,706,709],{},[670,704,705],{},"Air consumption",[670,707,708],{},"Continuous, low",[670,710,711],{},"Episodic, high",[648,713,714,717,720],{},[670,715,716],{},"Retrofit complexity",[670,718,719],{},"Single roof or wall mounting",[670,721,722],{},"Multiple wall mountings + reservoirs",[648,724,725,728,731],{},[670,726,727],{},"Best suited to",[670,729,730],{},"Most ash types, retrofit-friendly",[670,732,733],{},"Hardest-packed deposits, large silos",[74,735,122],{"id":121},[82,737,738,744,750,755,760,764],{},[85,739,740],{},[63,741,743],{"href":742},"\u002Fglossary\u002Fesp-hopper","ESP hopper",[85,745,746],{},[63,747,749],{"href":748},"\u002Fglossary\u002Fhopper","Hopper",[85,751,752],{},[63,753,754],{"href":620},"Bridging",[85,756,757],{},[63,758,759],{"href":624},"Rat-holing",[85,761,762],{},[63,763,350],{"href":116},[85,765,766],{},[63,767,768],{"href":662},"Air cannon (air blaster)",{"title":146,"searchDepth":147,"depth":147,"links":770},[771,772,773],{"id":629,"depth":147,"text":630},{"id":636,"depth":147,"text":637},{"id":121,"depth":147,"text":122},"esp","A fly-ash hopper is any inverted-pyramid or trough-shaped vessel that collects particulate ash from a combustion plant's flue-gas-cleaning equipment — ESPs, baghouses, economiser hoppers, air-heater hoppers, duct dropouts. Fly-ash hoppers across the gas-path system are notorious for bridging, rat-holing and pluggage.",{},[778,779,621,625,363,780],"esp-hopper","hopper","air-cannon-air-blaster",{"title":782,"description":783},"Fly-ash hopper — pluggage problems and sonic-horn flow aids","A fly-ash hopper collects particulate ash from ESP, baghouse, economiser and air-heater equipment. Bridging and rat-holing of fly ash are persistent operational problems.",[785],{"title":786,"url":787},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F","glossary\u002Ffly-ash-hopper","bMJn5P2k_mbOQpek1uyPwzpxFkcSFi5BK-ujWWfDvwc",1782613758306]