[{"data":1,"prerenderedAt":1079},["ShallowReactive",2],{"site-footer-common":3,"glossary:chloride-bypass":45,"glossary-related:chloride-bypass":185},{"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":164,"description":165,"extension":166,"meta":167,"navigation":168,"path":169,"relatedTerms":170,"seo":176,"sources":179,"stem":183,"term":47,"__hash__":184},"glossary\u002Fglossary\u002Fchloride-bypass.md","Chloride bypass",[49,50,51],"cement chloride bypass","bypass system (cement)","Cl bypass",{"type":53,"value":54,"toc":157},"minimark",[55,75,80,98,102,105,118,125,129],[56,57,58,59,63,64,69,70,74],"p",{},"A ",[60,61,62],"strong",{},"chloride bypass"," is a flue-gas slipstream system that extracts a fraction (typically 3–15%) of the kiln gas before it enters the ",[65,66,68],"a",{"href":67},"\u002Fglossary\u002Fpreheater-tower","preheater tower",", cooling it and removing the chlorine-rich dust to prevent chlorine accumulation in the ",[65,71,73],{"href":72},"\u002Fglossary\u002Fsulphur-cycle-chloride-cycle-alkali-cycle","chloride cycle",".",[76,77,79],"h2",{"id":78},"why-bypasses-are-increasingly-needed","Why bypasses are increasingly needed",[56,81,82,83,87,88,92,93,97],{},"Conventional cement raw materials and fossil fuels carry modest chlorine and sulphur. ",[65,84,86],{"href":85},"\u002Fglossary\u002Falternative-fuel","Alternative fuels"," — especially ",[65,89,91],{"href":90},"\u002Fglossary\u002Frdf-srf-tdf","RDF, SRF and TDF"," and sewage sludge — carry much more. Above a TSR threshold (typically 30–50% depending on raw materials), the chloride cycle saturates and starts to drive heavy ",[65,94,96],{"href":95},"\u002Fglossary\u002Fkiln-inlet-ring-snowman","kiln-inlet build-up"," that ultimately causes kiln stops. The bypass extracts chlorine fast enough to stabilise the cycle and let the plant operate at high TSR.",[76,99,101],{"id":100},"bypass-specific-fouling","Bypass-specific fouling",[56,103,104],{},"The bypass duct itself, the quenching tower, and the bypass dust hopper all foul aggressively:",[106,107,108,112,115],"ul",{},[109,110,111],"li",{},"Hot kiln gas containing high concentrations of chlorides condenses on the cooler bypass-duct walls",[109,113,114],{},"Quench water dropout creates sticky chloride-rich slurry",[109,116,117],{},"Bypass dust hopper bridges with fine sticky chloride material",[56,119,120,124],{},[65,121,123],{"href":122},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," on the bypass duct and dust hopper are the standard cleaning fit.",[76,126,128],{"id":127},"related-terms","Related terms",[106,130,131,137,142,147,152],{},[109,132,133],{},[65,134,136],{"href":135},"\u002Fglossary\u002Fkiln-inlet-riser-duct","Kiln inlet \u002F riser duct",[109,138,139],{},[65,140,141],{"href":72},"Sulphur \u002F chloride \u002F alkali cycles",[109,143,144],{},[65,145,146],{"href":85},"Alternative fuel",[109,148,149],{},[65,150,151],{"href":67},"Preheater tower",[109,153,154],{},[65,155,156],{"href":122},"Sonic horn",{"title":158,"searchDepth":159,"depth":159,"links":160},"",2,[161,162,163],{"id":78,"depth":159,"text":79},{"id":100,"depth":159,"text":101},{"id":127,"depth":159,"text":128},"cement","A chloride bypass is a flue-gas slipstream system that extracts a fraction (typically 3–15%) of the kiln gas before it enters the preheater tower, cooling it and removing the chlorine-rich dust to prevent chlorine accumulation in the chloride cycle.","md",{},true,"\u002Fglossary\u002Fchloride-bypass",[171,172,173,174,175],"kiln-inlet-riser-duct","sulphur-cycle-chloride-cycle-alkali-cycle","alternative-fuel","preheater-tower","sonic-horn",{"title":177,"description":178},"Chloride bypass — extracting a kiln-gas slipstream to control Cl cycles","A chloride bypass extracts a slipstream of kiln gas before the preheater to remove chlorine from the recirculating Cl cycle. Essential at high TSR; the bypass duct itself fouls heavily.",[180],{"title":181,"url":182},"VDZ — Bypass Systems","https:\u002F\u002Fwww.scribd.com\u002Fdocument\u002F499939627\u002FVDZ-3-5-en-Bypass-Systems","glossary\u002Fchloride-bypass","igkOavGw_l8HvBNezdUpZrruMof8Bd1RlhJPxqRLeVE",[186,314,534,713,847],{"id":187,"title":136,"aliases":188,"body":192,"category":164,"description":299,"extension":166,"meta":300,"navigation":168,"path":135,"relatedTerms":301,"seo":304,"sources":307,"stem":311,"term":312,"__hash__":313},"glossary\u002Fglossary\u002Fkiln-inlet-riser-duct.md",[189,190,191],"kiln inlet","riser duct","kiln riser",{"type":53,"value":193,"toc":294},[194,214,218,237,244,248,267,269],[56,195,196,197,200,201,205,206,210,211,213],{},"The ",[60,198,199],{},"kiln inlet \u002F riser duct"," is the connection between the upper end of the ",[65,202,204],{"href":203},"\u002Fglossary\u002Frotary-kiln","rotary kiln"," and the ",[65,207,209],{"href":208},"\u002Fglossary\u002Fcalciner","calciner"," \u002F ",[65,212,68],{"href":67}," above. Hot kiln gas rises through the inlet into the calciner, and pre-calcined meal descends from the calciner into the kiln. The geometry — narrow, hot, dust-laden — makes this the single most fouled location in any cement plant.",[76,215,217],{"id":216},"why-it-fouls-so-heavily","Why it fouls so heavily",[106,219,220,223,226,229,234],{},[109,221,222],{},"Temperature is in the alkali \u002F chloride condensation window (~800 °C at the inlet)",[109,224,225],{},"Gas-side velocity is high",[109,227,228],{},"Sticky pre-calcined meal contacts cooler steel and refractory",[109,230,231,233],{},[65,232,146],{"href":85}," firing in the calciner adds chlorine and sulphur to the gas",[109,235,236],{},"The bend geometry creates dead zones where build-up accelerates",[56,238,239,240,243],{},"The visible result is the ",[65,241,242],{"href":95},"kiln-inlet ring or \"snowman\""," — a massive accretion that can completely block the gas path if untreated.",[76,245,247],{"id":246},"cleaning-intensity","Cleaning intensity",[56,249,250,251,257,258,262,263,74],{},"Cement plants typically run ",[60,252,253,254],{},"multiple ",[65,255,256],{"href":122},"sonic horns"," concentrated on the kiln inlet, supplemented by ",[65,259,261],{"href":260},"\u002Fglossary\u002Fair-cannon-air-blaster","air cannons"," for periodic remediation and manual water-lancing during planned outages. The mix and intensity scale up sharply on plants running > 50% ",[65,264,266],{"href":265},"\u002Fglossary\u002Fthermal-substitution-rate","TSR",[76,268,128],{"id":127},[106,270,271,276,280,285,290],{},[109,272,273],{},[65,274,275],{"href":203},"Rotary kiln",[109,277,278],{},[65,279,151],{"href":67},[109,281,282],{},[65,283,284],{"href":95},"Kiln-inlet ring \u002F snowman",[109,286,287],{},[65,288,289],{"href":208},"Calciner",[109,291,292],{},[65,293,156],{"href":122},{"title":158,"searchDepth":159,"depth":159,"links":295},[296,297,298],{"id":216,"depth":159,"text":217},{"id":246,"depth":159,"text":247},{"id":127,"depth":159,"text":128},"The kiln inlet \u002F riser duct is the connection between the upper end of the rotary kiln and the calciner \u002F preheater tower above. Hot kiln gas rises through the inlet into the calciner, and pre-calcined meal descends from the calciner into the kiln. The geometry — narrow, hot, dust-laden — makes this the single most fouled location in any cement plant.",{},[302,174,303,209,175],"rotary-kiln","kiln-inlet-ring-snowman",{"title":305,"description":306},"Kiln inlet and riser duct — the most-fouled point in any cement plant","The kiln inlet \u002F riser duct is the connection between the rotary kiln and the calciner \u002F preheater. It is the most-fouled location in any cement plant, the focal point for sonic-horn cleaning.",[308],{"title":309,"url":310},"Wikipedia — Cement kiln","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FCement_kiln","glossary\u002Fkiln-inlet-riser-duct","Kiln inlet and riser duct","mSo67H5oiYYmuvreXfG8RTQB2lyD_SYb0CEy4PCxPPk",{"id":315,"title":141,"aliases":316,"body":320,"category":164,"description":520,"extension":166,"meta":521,"navigation":168,"path":72,"relatedTerms":522,"seo":524,"sources":527,"stem":531,"term":532,"__hash__":533},"glossary\u002Fglossary\u002Fsulphur-cycle-chloride-cycle-alkali-cycle.md",[317,73,318,319],"sulphur cycle","alkali cycle","volatile cycles",{"type":53,"value":321,"toc":514},[322,343,347,424,428,437,440,460,464,494,496],[56,323,196,324,327,328,331,332,335,336,338,339,342],{},[60,325,326],{},"sulphur",", ",[60,329,330],{},"chloride"," and ",[60,333,334],{},"alkali cycles"," describe how volatile species evaporate from the ",[65,337,302],{"href":203}," burning zone, rise with the gas flow, condense in the cooler ",[65,340,341],{"href":67},"preheater"," above, return to the kiln in the descending raw meal, and recirculate. Each cycle has its own behaviour and operational consequences.",[76,344,346],{"id":345},"the-three-cycles","The three cycles",[348,349,350,369],"table",{},[351,352,353],"thead",{},[354,355,356,360,363,366],"tr",{},[357,358,359],"th",{},"Cycle",[357,361,362],{},"Volatile species",[357,364,365],{},"Condensation window",[357,367,368],{},"Operational consequence",[370,371,372,389,408],"tbody",{},[354,373,374,380,383,386],{},[375,376,377],"td",{},[60,378,379],{},"Sulphur cycle",[375,381,382],{},"SO₂, SO₃, alkali sulphates",[375,384,385],{},"800–1,000 °C",[375,387,388],{},"Sticky alkali-sulphate coatings in preheater stages 4–5",[354,390,391,396,399,402],{},[375,392,393],{},[60,394,395],{},"Chloride cycle",[375,397,398],{},"KCl, NaCl",[375,400,401],{},"700–900 °C",[375,403,404,405],{},"Aggressive sticky coatings; primary driver of ",[65,406,407],{"href":95},"kiln-inlet snowmen",[354,409,410,415,418,421],{},[375,411,412],{},[60,413,414],{},"Alkali cycle",[375,416,417],{},"K₂O, Na₂O",[375,419,420],{},"wide",[375,422,423],{},"Sets cement chemistry; affects strength development",[76,425,427],{"id":426},"why-the-cycles-matter-operationally","Why the cycles matter operationally",[56,429,430,431,87,434,436],{},"All three cycles concentrate volatiles in the gas-phase recirculation loop unless something extracts them. Conventional cement raw materials and fossil fuels carry modest loadings; ",[65,432,433],{"href":85},"alternative fuels",[65,435,91],{"href":90}," — add substantially more chlorine, sulphur and sometimes alkali.",[56,438,439],{},"When a cycle saturates:",[106,441,442,450,455],{},[109,443,444,446,447,449],{},[60,445,395],{}," — heavy ",[65,448,96],{"href":95},"; kiln stop unavoidable",[109,451,452,454],{},[60,453,379],{}," — preheater coatings; cyclone pluggage",[109,456,457,459],{},[60,458,414],{}," — clinker quality issues; cement performance drift",[76,461,463],{"id":462},"cycle-management","Cycle management",[106,465,466,473,479,485],{},[109,467,468,472],{},[60,469,470],{},[65,471,47],{"href":169}," — extracts a slipstream of gas from the kiln inlet to remove chlorine",[109,474,475,478],{},[60,476,477],{},"Raw-material substitution"," — selecting lower-Cl\u002F-S\u002F-alkali raw materials",[109,480,481,484],{},[60,482,483],{},"Fuel blending"," — controlling AFR chlorine and sulphur content",[109,486,487,493],{},[60,488,489,331,491],{},[65,490,123],{"href":122},[65,492,261],{"href":260}," on the preheater and kiln inlet to keep accumulating coatings under control",[76,495,128],{"id":127},[106,497,498,502,506,510],{},[109,499,500],{},[65,501,151],{"href":67},[109,503,504],{},[65,505,284],{"href":95},[109,507,508],{},[65,509,146],{"href":85},[109,511,512],{},[65,513,47],{"href":169},{"title":158,"searchDepth":159,"depth":159,"links":515},[516,517,518,519],{"id":345,"depth":159,"text":346},{"id":426,"depth":159,"text":427},{"id":462,"depth":159,"text":463},{"id":127,"depth":159,"text":128},"The sulphur, chloride and alkali cycles describe how volatile species evaporate from the rotary-kiln burning zone, rise with the gas flow, condense in the cooler preheater above, return to the kiln in the descending raw meal, and recirculate. Each cycle has its own behaviour and operational consequences.",{},[174,303,173,523],"chloride-bypass",{"title":525,"description":526},"Sulphur, chloride and alkali cycles — recirculating volatiles in cement kilns","Sulphur, chloride and alkali cycles describe how volatile species evaporate from the kiln burning zone, condense in the cooler preheater, and recirculate. Their build-up drives kiln-stop fouling.",[528],{"title":529,"url":530},"ECRA — Sulphur and Chloride Cycles","https:\u002F\u002Fwww.ecra-online.org\u002Fnewsletters\u002Fsulphur-and-chloride-cycles-and-the-use-of-alternative-fuels-or-raw-materials","glossary\u002Fsulphur-cycle-chloride-cycle-alkali-cycle","Sulphur, chloride and alkali cycles","1q8xkjwUqGJNxldxfJ12G0VfAG8TsdalMouPDL7DUl8",{"id":535,"title":536,"aliases":537,"body":541,"category":164,"description":701,"extension":166,"meta":702,"navigation":168,"path":85,"relatedTerms":703,"seo":706,"sources":709,"stem":711,"term":146,"__hash__":712},"glossary\u002Fglossary\u002Falternative-fuel.md","Alternative fuel (AFR)",[538,433,539,540],"AFR","secondary fuel","waste-derived fuel",{"type":53,"value":542,"toc":695},[543,558,562,597,601,626,630,633,662,669,671],[56,544,545,547,548,551,552,554,555,557],{},[60,546,536],{}," — sometimes ",[549,550,539],"em",{}," or ",[549,553,540],{}," — refers to non-fossil energy sources used to replace coal, petcoke and natural gas in cement-kiln combustion. The cement industry is the largest single user of AFR worldwide because the high temperatures and long residence times in a ",[65,556,204],{"href":203}," destroy organic contaminants, and the alkaline raw materials neutralise acidic combustion products.",[76,559,561],{"id":560},"common-afr-streams","Common AFR streams",[106,563,564,570,576,582,585,588,591,594],{},[109,565,566,569],{},[65,567,568],{"href":90},"RDF"," — refuse-derived fuel",[109,571,572,575],{},[65,573,574],{"href":90},"SRF"," — solid recovered fuel (higher-spec RDF)",[109,577,578,581],{},[65,579,580],{"href":90},"TDF"," — tyre-derived fuel",[109,583,584],{},"Sewage sludge (dried)",[109,586,587],{},"Animal-meal residues",[109,589,590],{},"Agricultural residues",[109,592,593],{},"Used solvents and waste oils",[109,595,596],{},"Plastic and paper fractions",[76,598,600],{"id":599},"drivers","Drivers",[106,602,603,609,615,621],{},[109,604,605,608],{},[60,606,607],{},"CO₂ reduction"," — biomass fractions reduce net carbon emissions",[109,610,611,614],{},[60,612,613],{},"Waste-disposal economics"," — gate fees offset fuel cost",[109,616,617,620],{},[60,618,619],{},"EU ETS pressure"," — carbon prices punish fossil-fuel firing",[109,622,623],{},[60,624,625],{},"Regional waste-management policies",[76,627,629],{"id":628},"operational-consequences","Operational consequences",[56,631,632],{},"AFR firing typically intensifies several existing operational problems:",[106,634,635,641,650,656],{},[109,636,637,638],{},"More chlorine and sulphur in the ",[65,639,640],{"href":72},"sulphur and chloride cycles",[109,642,643,644,331,646],{},"More ",[65,645,96],{"href":95},[65,647,649],{"href":648},"\u002Fglossary\u002Fbuild-up-coating-accretion","preheater coatings",[109,651,652,653,655],{},"More frequent ",[65,654,62],{"href":169}," operation",[109,657,658,659,661],{},"More demanding ",[65,660,209],{"href":208}," burner control",[56,663,664,331,666,668],{},[65,665,123],{"href":122},[65,667,261],{"href":260}," on the preheater and kiln inlet become more important as TSR rises.",[76,670,128],{"id":127},[106,672,673,678,683,687,691],{},[109,674,675],{},[65,676,677],{"href":90},"RDF \u002F SRF \u002F TDF",[109,679,680],{},[65,681,682],{"href":265},"Thermal substitution rate (TSR)",[109,684,685],{},[65,686,289],{"href":208},[109,688,689],{},[65,690,47],{"href":169},[109,692,693],{},[65,694,141],{"href":72},{"title":158,"searchDepth":159,"depth":159,"links":696},[697,698,699,700],{"id":560,"depth":159,"text":561},{"id":599,"depth":159,"text":600},{"id":628,"depth":159,"text":629},{"id":127,"depth":159,"text":128},"Alternative fuel (AFR) — sometimes secondary fuel or waste-derived fuel — refers to non-fossil energy sources used to replace coal, petcoke and natural gas in cement-kiln combustion. The cement industry is the largest single user of AFR worldwide because the high temperatures and long residence times in a rotary kiln destroy organic contaminants, and the alkaline raw materials neutralise acidic combustion products.",{},[704,705,209,523,172],"rdf-srf-tdf","thermal-substitution-rate",{"title":707,"description":708},"Alternative fuel (AFR) — non-fossil fuels for cement kilns","Alternative fuels (AFR) replace fossil fuel in cement kilns. They cut CO2 emissions and waste-disposal cost but increase chlorine, sulphur and alkali loading in the kiln gas.",[710],{"title":309,"url":310},"glossary\u002Falternative-fuel","8a9Wktj3h9L0w-C7tMXKI-y1T31K4IsFiIBPj8b461Y",{"id":714,"title":151,"aliases":715,"body":719,"category":164,"description":835,"extension":166,"meta":836,"navigation":168,"path":67,"relatedTerms":837,"seo":839,"sources":842,"stem":845,"term":151,"__hash__":846},"glossary\u002Fglossary\u002Fpreheater-tower.md",[716,717,718],"cement preheater","preheater tower cement","cyclone preheater",{"type":53,"value":720,"toc":830},[721,734,738,748,760,764,767,797,800,802],[56,722,58,723,725,726,730,731,733],{},[60,724,68],{}," is a vertical stack of ",[65,727,729],{"href":728},"\u002Fglossary\u002Fpreheater-cyclone","cyclone separators"," that pre-heats incoming raw meal with hot exhaust gas from the ",[65,732,204],{"href":203}," before the meal enters the kiln itself. Modern cement plants use 4-, 5- or 6-stage preheater towers, recovering enough heat from kiln exhaust to deliver raw meal to the kiln at 800–900 °C.",[76,735,737],{"id":736},"why-preheater-towers-are-fouling-prone","Why preheater towers are fouling-prone",[56,739,740,741,743,744,747],{},"The lower preheater stages — and especially the ",[65,742,199],{"href":135}," — sit in a temperature window (700–900 °C) where alkali sulphates and chlorides condense from the gas onto cooler refractory and steel surfaces. The resulting ",[65,745,746],{"href":648},"build-up \u002F coating \u002F accretion"," grows progressively, narrows the gas path, and eventually causes a kiln stop for manual cleaning.",[56,749,750,751,754,755,757,758,74],{},"The fouling intensifies when ",[65,752,753],{"href":85},"alternative fuels (AFR)"," — ",[65,756,677],{"href":90}," — replace conventional fossil fuels, because waste fuels release more chlorine and sulphur into the ",[65,759,640],{"href":72},[76,761,763],{"id":762},"cleaning-the-preheater","Cleaning the preheater",[56,765,766],{},"Acoustic cleaning is the dominant preventive technology on modern cement preheater towers:",[106,768,769,777,785,791],{},[109,770,771,776],{},[60,772,773,775],{},[65,774,123],{"href":122}," at 75–125 Hz"," mounted on the lower-stage cyclones and the kiln-inlet area",[109,778,779,784],{},[60,780,781],{},[65,782,783],{"href":260},"Air cannons"," as periodic remediation for the heaviest deposits",[109,786,787,790],{},[60,788,789],{},"Manual water-lancing"," during planned outages",[109,792,793,796],{},[60,794,795],{},"Operator monitoring"," of cyclone ΔP and meal-flow indicators as early warning",[56,798,799],{},"The Sylio value proposition on cement preheaters is preserving kiln availability — every avoided unplanned stop is worth 24–72 hours of clinker production.",[76,801,128],{"id":127},[106,803,804,809,813,817,821,826],{},[109,805,806],{},[65,807,808],{"href":728},"Preheater cyclone",[109,810,811],{},[65,812,289],{"href":208},[109,814,815],{},[65,816,275],{"href":203},[109,818,819],{},[65,820,136],{"href":135},[109,822,823],{},[65,824,825],{"href":265},"Thermal substitution rate",[109,827,828],{},[65,829,156],{"href":122},{"title":158,"searchDepth":159,"depth":159,"links":831},[832,833,834],{"id":736,"depth":159,"text":737},{"id":762,"depth":159,"text":763},{"id":127,"depth":159,"text":128},"A preheater tower is a vertical stack of cyclone separators that pre-heats incoming raw meal with hot exhaust gas from the rotary kiln before the meal enters the kiln itself. Modern cement plants use 4-, 5- or 6-stage preheater towers, recovering enough heat from kiln exhaust to deliver raw meal to the kiln at 800–900 °C.",{},[838,209,302,171,705,175],"preheater-cyclone",{"title":840,"description":841},"Preheater tower — multi-stage cyclone heat exchanger feeding the cement kiln","A preheater tower is a vertical stack of cyclone separators that pre-heats raw meal with kiln exhaust gas before it enters the rotary kiln. The most fouling-prone section of any cement plant.",[843,844],{"title":309,"url":310},{"title":529,"url":530},"glossary\u002Fpreheater-tower","nTZjuMnzN9vAh_OaO2iJWciYrv1LpKAM_yqg0BNl5TM",{"id":848,"title":156,"aliases":849,"body":852,"category":1054,"description":1055,"extension":166,"meta":1056,"navigation":168,"path":122,"relatedTerms":1057,"seo":1064,"sources":1067,"stem":1077,"term":156,"__hash__":1078},"glossary\u002Fglossary\u002Fsonic-horn.md",[256,850,851],"sonic cleaning horn","industrial sonic horn",{"type":53,"value":853,"toc":1047},[854,885,889,897,901,963,967,1003,1007,1015,1017],[56,855,58,856,859,860,864,865,327,869,327,873,327,877,331,881,74],{},[60,857,858],{},"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 ",[65,861,863],{"href":862},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[65,866,868],{"href":867},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",[65,870,872],{"href":871},"\u002Fglossary\u002Ffabric-filter","baghouses",[65,874,876],{"href":875},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[65,878,880],{"href":879},"\u002Fglossary\u002Fsuperheater","boiler heat-transfer surfaces",[65,882,884],{"href":883},"\u002Fglossary\u002Fhopper","hoppers and silos",[76,886,888],{"id":887},"how-a-sonic-horn-works","How a sonic horn works",[56,890,891,892,896],{},"Compressed plant air admitted through a ",[65,893,895],{"href":894},"\u002Fglossary\u002Fsolenoid-valve","solenoid valve"," drives a metal diaphragm — typically titanium or 316 stainless — into resonant oscillation at the horn's fundamental frequency. The oscillating pressure field is amplified by an exponential bell horn and projected into the vessel as a near-spherical sound wave. Particulate already deposited on internal surfaces receives an oscillating acceleration that overcomes adhesion; loosened material is then carried out with the gas flow before it can sinter, bridge or bond. Because the cleaning is acoustic and non-contact, the horn can fire while the plant is online without tube erosion, refractory damage or thermal shock.",[76,898,900],{"id":899},"key-parameters","Key parameters",[348,902,903,913],{},[351,904,905],{},[354,906,907,910],{},[357,908,909],{},"Parameter",[357,911,912],{},"Typical range",[370,914,915,923,931,939,947,955],{},[354,916,917,920],{},[375,918,919],{},"Fundamental frequency",[375,921,922],{},"60–400 Hz",[354,924,925,928],{},[375,926,927],{},"Sound pressure level",[375,929,930],{},"140–180 dB",[354,932,933,936],{},[375,934,935],{},"Compressed-air consumption",[375,937,938],{},"8–14 Nm³\u002Fmin at 4–7 bar",[354,940,941,944],{},[375,942,943],{},"Operating temperature (with appropriate materials)",[375,945,946],{},"−40 °C to +500 °C",[354,948,949,952],{},[375,950,951],{},"Firing cycle",[375,953,954],{},"5–15 s burst, repeated every 3–15 minutes",[354,956,957,960],{},[375,958,959],{},"Mass",[375,961,962],{},"15–60 kg depending on horn size",[76,964,966],{"id":965},"frequency-selection","Frequency selection",[56,968,969,970,327,973,977,978,327,982,986,987,327,990,994,995,331,999,74],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[65,971,972],{"href":728},"preheater cyclones",[65,974,976],{"href":975},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters",", large ",[65,979,981],{"href":980},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[65,983,985],{"href":984},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[65,988,989],{"href":871},"fabric-filter compartments",[65,991,993],{"href":992},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[65,996,998],{"href":997},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[65,1000,1002],{"href":1001},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[76,1004,1006],{"id":1005},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[56,1008,1009,1010,1014],{},"Sonic horns are increasingly specified alongside or in place of ",[65,1011,1013],{"href":1012},"\u002Fglossary\u002Fsteam-sootblower","steam sootblowers"," because they consume no boiler-grade steam, cause no tube erosion, require almost no moving parts and can fire every few minutes without operator intervention. They are less effective on hard, fused slag than retractable steam lances, so on furnace waterwalls and high-temperature superheaters they typically complement rather than replace mechanical cleaning.",[76,1016,128],{"id":127},[106,1018,1019,1024,1030,1036,1042],{},[109,1020,1021],{},[65,1022,1023],{"href":862},"Acoustic cleaner",[109,1025,1026],{},[65,1027,1029],{"href":1028},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[109,1031,1032],{},[65,1033,1035],{"href":1034},"\u002Fglossary\u002Fbell-horn","Bell horn",[109,1037,1038],{},[65,1039,1041],{"href":1040},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[109,1043,1044],{},[65,1045,1046],{"href":997},"Low-frequency acoustic cleaner",{"title":158,"searchDepth":159,"depth":159,"links":1048},[1049,1050,1051,1052,1053],{"id":887,"depth":159,"text":888},{"id":899,"depth":159,"text":900},{"id":965,"depth":159,"text":966},{"id":1005,"depth":159,"text":1006},{"id":127,"depth":159,"text":128},"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.",{},[1058,1059,1060,1061,1062,1063],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":1065,"description":1066},"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.",[1068,1071,1074],{"title":1069,"url":1070},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":1072,"url":1073},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":1075,"url":1076},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613727271]