[{"data":1,"prerenderedAt":801},["ShallowReactive",2],{"site-footer-common":3,"glossary:tertiary-air-duct":45,"glossary-related:tertiary-air-duct":178},{"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":158,"description":159,"extension":160,"meta":161,"navigation":162,"path":163,"relatedTerms":164,"seo":168,"sources":171,"stem":175,"term":176,"__hash__":177},"glossary\u002Fglossary\u002Ftertiary-air-duct.md","Tertiary air duct (TAD)",[49,50,51],"TAD","tertiary air","cement TAD",{"type":53,"value":54,"toc":151},"minimark",[55,80,85,113,117,124,128],[56,57,58,59,63,64,69,70,74,75,79],"p",{},"The ",[60,61,62],"strong",{},"tertiary air duct (TAD)"," routes hot combustion air from the ",[65,66,68],"a",{"href":67},"\u002Fglossary\u002Fclinker-cooler","clinker cooler"," to the ",[65,71,73],{"href":72},"\u002Fglossary\u002Fcalciner","calciner"," firing zone, bypassing the ",[65,76,78],{"href":77},"\u002Fglossary\u002Frotary-kiln","rotary kiln",". The TAD is essential to separate-calciner designs because it provides the oxygen needed to burn calciner fuel without diverting kiln air.",[81,82,84],"h2",{"id":83},"operational-issues","Operational issues",[86,87,88,95,101,107],"ul",{},[89,90,91,94],"li",{},[60,92,93],{},"Dust dropout"," — fine clinker dust carried over from the cooler settles along the TAD bottom and accumulates",[89,96,97,100],{},[60,98,99],{},"Localised build-up"," at bends and restrictions in the duct path",[89,102,103,106],{},[60,104,105],{},"Pluggage"," at the TAD-calciner inlet",[89,108,109,112],{},[60,110,111],{},"Refractory wear"," from impingement at duct bends",[81,114,116],{"id":115},"cleaning","Cleaning",[56,118,119,123],{},[65,120,122],{"href":121},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," installed along the TAD prevent dust settlement and keep the air flow free of restrictions. Periodic pneumatic-gate discharge of accumulated dust from purpose-built TAD hoppers complements acoustic cleaning.",[81,125,127],{"id":126},"related-terms","Related terms",[86,129,130,135,140,146],{},[89,131,132],{},[65,133,134],{"href":72},"Calciner",[89,136,137],{},[65,138,139],{"href":67},"Clinker cooler",[89,141,142],{},[65,143,145],{"href":144},"\u002Fglossary\u002Fpreheater-tower","Preheater tower",[89,147,148],{},[65,149,150],{"href":121},"Sonic horn",{"title":152,"searchDepth":153,"depth":153,"links":154},"",2,[155,156,157],{"id":83,"depth":153,"text":84},{"id":115,"depth":153,"text":116},{"id":126,"depth":153,"text":127},"cement","The tertiary air duct (TAD) routes hot combustion air from the clinker cooler to the calciner firing zone, bypassing the rotary kiln. The TAD is essential to separate-calciner designs because it provides the oxygen needed to burn calciner fuel without diverting kiln air.","md",{},true,"\u002Fglossary\u002Ftertiary-air-duct",[73,165,166,167],"clinker-cooler","preheater-tower","sonic-horn",{"title":169,"description":170},"Tertiary air duct (TAD) — combustion air route from clinker cooler to calciner","The tertiary air duct routes hot air from the clinker cooler to the calciner combustion zone, bypassing the kiln. Dust dropout in the TAD is a recurring operational issue.",[172],{"title":173,"url":174},"CemNet — Clinker dust in tertiary air duct","https:\u002F\u002Fwww.cemnet.com\u002FForum\u002Fthread\u002F107759\u002Fclinker-dust-in-tertiary-air-duct.html","glossary\u002Ftertiary-air-duct","Tertiary air duct","65fo4jNdus5BZoMPtuOGW0E3HXWP9mTBJ7ZRBSmtBVU",[179,314,419,561],{"id":180,"title":134,"aliases":181,"body":186,"category":158,"description":299,"extension":160,"meta":300,"navigation":162,"path":72,"relatedTerms":301,"seo":305,"sources":308,"stem":312,"term":134,"__hash__":313},"glossary\u002Fglossary\u002Fcalciner.md",[182,183,184,185],"cement calciner","inline calciner","separate calciner","precalciner",{"type":53,"value":187,"toc":293},[188,209,213,231,235,261,263,266,268],[56,189,190,191,193,194,196,197,200,201,204,205,208],{},"A ",[60,192,73],{}," is the combustion chamber in a modern cement preheater tower where raw meal is pre-calcined — the endothermic CaCO₃ → CaO + CO₂ reaction is driven to ~90% completion — before the meal enters the ",[65,195,78],{"href":77},". Calciners can be ",[60,198,199],{},"inline"," (placed in the kiln-riser gas path) or ",[60,202,203],{},"separate"," (a dedicated combustion chamber receiving tertiary air through a dedicated ",[65,206,207],{"href":163},"tertiary air duct",").",[81,210,212],{"id":211},"afr-firing","AFR firing",[56,214,215,216,220,221,225,226,230],{},"Calciners are the dominant firing location for ",[65,217,219],{"href":218},"\u002Fglossary\u002Falternative-fuel","alternative fuels"," (",[65,222,224],{"href":223},"\u002Fglossary\u002Frdf-srf-tdf","RDF, SRF, TDF",", sewage sludge). They tolerate variable-quality waste fuels better than the main kiln burner because residence time is longer and temperatures are lower. Cement plants targeting high ",[65,227,229],{"href":228},"\u002Fglossary\u002Fthermal-substitution-rate","thermal substitution rates (TSR)"," concentrate their AFR firing in the calciner.",[81,232,234],{"id":233},"fouling","Fouling",[56,236,237,238,242,243,247,248,252,253,257,258,260],{},"AFR firing in the calciner raises the chlorine and sulphur loading of the gas reaching the ",[65,239,241],{"href":240},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones"," above. This intensifies the ",[65,244,246],{"href":245},"\u002Fglossary\u002Fbuild-up-coating-accretion","build-up"," problem in the lower preheater stages and the ",[65,249,251],{"href":250},"\u002Fglossary\u002Fkiln-inlet-riser-duct","kiln riser",", driving the need for ",[65,254,256],{"href":255},"\u002Fglossary\u002Fchloride-bypass","chloride bypass"," and active ",[65,259,167],{"href":121}," cleaning.",[81,262,116],{"id":115},[56,264,265],{},"Sonic horns are mounted on calciner walls and on the calciner outlet to the preheater stage 5 cyclone, keeping the gas path free of the alkali coatings that accumulate at high AFR rates.",[81,267,127],{"id":126},[86,269,270,274,279,284,289],{},[89,271,272],{},[65,273,145],{"href":144},[89,275,276],{},[65,277,278],{"href":240},"Preheater cyclone",[89,280,281],{},[65,282,283],{"href":77},"Rotary kiln",[89,285,286],{},[65,287,288],{"href":218},"Alternative fuel (AFR)",[89,290,291],{},[65,292,150],{"href":121},{"title":152,"searchDepth":153,"depth":153,"links":294},[295,296,297,298],{"id":211,"depth":153,"text":212},{"id":233,"depth":153,"text":234},{"id":115,"depth":153,"text":116},{"id":126,"depth":153,"text":127},"A calciner is the combustion chamber in a modern cement preheater tower where raw meal is pre-calcined — the endothermic CaCO₃ → CaO + CO₂ reaction is driven to ~90% completion — before the meal enters the rotary kiln. Calciners can be inline (placed in the kiln-riser gas path) or separate (a dedicated combustion chamber receiving tertiary air through a dedicated tertiary air duct).",{},[166,302,303,304,167],"preheater-cyclone","rotary-kiln","alternative-fuel",{"title":306,"description":307},"Calciner — cement-plant pre-calcination chamber for raw meal","A calciner is a combustion chamber in the cement preheater tower where raw meal is pre-calcined (CaCO3 → CaO) before entering the rotary kiln. Common site for AFR firing.",[309],{"title":310,"url":311},"Wikipedia — Cement kiln","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FCement_kiln","glossary\u002Fcalciner","7__3zwaD-YwbWIprz3qMM76tTceT3xtEYbzJgZ_dq1s",{"id":315,"title":139,"aliases":316,"body":319,"category":158,"description":408,"extension":160,"meta":409,"navigation":162,"path":67,"relatedTerms":410,"seo":412,"sources":415,"stem":417,"term":139,"__hash__":418},"glossary\u002Fglossary\u002Fclinker-cooler.md",[317,318],"grate cooler","cement cooler",{"type":53,"value":320,"toc":403},[321,343,347,353,373,377,382,384],[56,322,190,323,325,326,328,329,333,334,336,337,339,340,342],{},[60,324,68],{}," (most commonly a ",[60,327,317],{},") quenches hot ",[65,330,332],{"href":331},"\u002Fglossary\u002Fclinker","clinker"," discharged from the ",[65,335,78],{"href":77}," at ~1,400 °C down to ~100 °C using forced ambient air blown upward through a perforated grate. Hot air recovered from the cooler is used as secondary combustion air at the main kiln burner and as tertiary air at the ",[65,338,73],{"href":72}," via the ",[65,341,62],{"href":163},".",[81,344,346],{"id":345},"cooler-related-fouling","Cooler-related fouling",[56,348,349,350,352],{},"The cooler itself rarely fouls but generates substantial fines that drop out into hoppers below and along the ",[65,351,49],{"href":163},":",[86,354,355,361,367],{},[89,356,357,360],{},[60,358,359],{},"Cooler dust hopper bridging"," — hopper outlets clog with fine clinker dust",[89,362,363,366],{},[60,364,365],{},"Pulse-jet filter pluggage"," on cooler vent baghouses",[89,368,369,372],{},[60,370,371],{},"TAD bottom dropout"," along the air route to the calciner",[81,374,376],{"id":375},"sonic-horn-duty","Sonic-horn duty",[56,378,379,381],{},[65,380,122],{"href":121}," installed on the cooler dust hoppers prevent bridging and maintain dust extraction. The horns must tolerate the high-temperature environment immediately below the kiln-discharge zone; stainless-steel construction is standard.",[81,383,127],{"id":126},[86,385,386,391,395,399],{},[89,387,388],{},[65,389,390],{"href":331},"Clinker",[89,392,393],{},[65,394,283],{"href":77},[89,396,397],{},[65,398,47],{"href":163},[89,400,401],{},[65,402,150],{"href":121},{"title":152,"searchDepth":153,"depth":153,"links":404},[405,406,407],{"id":345,"depth":153,"text":346},{"id":375,"depth":153,"text":376},{"id":126,"depth":153,"text":127},"A clinker cooler (most commonly a grate cooler) quenches hot clinker discharged from the rotary kiln at ~1,400 °C down to ~100 °C using forced ambient air blown upward through a perforated grate. Hot air recovered from the cooler is used as secondary combustion air at the main kiln burner and as tertiary air at the calciner via the tertiary air duct (TAD).",{},[332,303,411,167],"tertiary-air-duct",{"title":413,"description":414},"Clinker cooler — quench cooler at the rotary kiln discharge","A clinker cooler quenches hot clinker discharged from the rotary kiln using forced ambient air. Hot air recovered is sent to the calciner via the TAD; cooler dust hoppers benefit from sonic horns.",[416],{"title":310,"url":311},"glossary\u002Fclinker-cooler","QXNM4UlwGH82bX8us1X5_raAfNpFEkzmyhE_Rx9WnQs",{"id":420,"title":145,"aliases":421,"body":425,"category":158,"description":546,"extension":160,"meta":547,"navigation":162,"path":144,"relatedTerms":548,"seo":551,"sources":554,"stem":559,"term":145,"__hash__":560},"glossary\u002Fglossary\u002Fpreheater-tower.md",[422,423,424],"cement preheater","preheater tower cement","cyclone preheater",{"type":53,"value":426,"toc":541},[427,440,444,455,470,474,477,508,511,513],[56,428,190,429,432,433,436,437,439],{},[60,430,431],{},"preheater tower"," is a vertical stack of ",[65,434,435],{"href":240},"cyclone separators"," that pre-heats incoming raw meal with hot exhaust gas from the ",[65,438,78],{"href":77}," 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.",[81,441,443],{"id":442},"why-preheater-towers-are-fouling-prone","Why preheater towers are fouling-prone",[56,445,446,447,450,451,454],{},"The lower preheater stages — and especially the ",[65,448,449],{"href":250},"kiln inlet \u002F riser duct"," — 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 ",[65,452,453],{"href":245},"build-up \u002F coating \u002F accretion"," grows progressively, narrows the gas path, and eventually causes a kiln stop for manual cleaning.",[56,456,457,458,461,462,465,466,342],{},"The fouling intensifies when ",[65,459,460],{"href":218},"alternative fuels (AFR)"," — ",[65,463,464],{"href":223},"RDF \u002F SRF \u002F TDF"," — replace conventional fossil fuels, because waste fuels release more chlorine and sulphur into the ",[65,467,469],{"href":468},"\u002Fglossary\u002Fsulphur-cycle-chloride-cycle-alkali-cycle","sulphur and chloride cycles",[81,471,473],{"id":472},"cleaning-the-preheater","Cleaning the preheater",[56,475,476],{},"Acoustic cleaning is the dominant preventive technology on modern cement preheater towers:",[86,478,479,487,496,502],{},[89,480,481,486],{},[60,482,483,485],{},[65,484,122],{"href":121}," at 75–125 Hz"," mounted on the lower-stage cyclones and the kiln-inlet area",[89,488,489,495],{},[60,490,491],{},[65,492,494],{"href":493},"\u002Fglossary\u002Fair-cannon-air-blaster","Air cannons"," as periodic remediation for the heaviest deposits",[89,497,498,501],{},[60,499,500],{},"Manual water-lancing"," during planned outages",[89,503,504,507],{},[60,505,506],{},"Operator monitoring"," of cyclone ΔP and meal-flow indicators as early warning",[56,509,510],{},"The Sylio value proposition on cement preheaters is preserving kiln availability — every avoided unplanned stop is worth 24–72 hours of clinker production.",[81,512,127],{"id":126},[86,514,515,519,523,527,532,537],{},[89,516,517],{},[65,518,278],{"href":240},[89,520,521],{},[65,522,134],{"href":72},[89,524,525],{},[65,526,283],{"href":77},[89,528,529],{},[65,530,531],{"href":250},"Kiln inlet \u002F riser duct",[89,533,534],{},[65,535,536],{"href":228},"Thermal substitution rate",[89,538,539],{},[65,540,150],{"href":121},{"title":152,"searchDepth":153,"depth":153,"links":542},[543,544,545],{"id":442,"depth":153,"text":443},{"id":472,"depth":153,"text":473},{"id":126,"depth":153,"text":127},"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.",{},[302,73,303,549,550,167],"kiln-inlet-riser-duct","thermal-substitution-rate",{"title":552,"description":553},"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.",[555,556],{"title":310,"url":311},{"title":557,"url":558},"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\u002Fpreheater-tower","nTZjuMnzN9vAh_OaO2iJWciYrv1LpKAM_yqg0BNl5TM",{"id":562,"title":150,"aliases":563,"body":567,"category":776,"description":777,"extension":160,"meta":778,"navigation":162,"path":121,"relatedTerms":779,"seo":786,"sources":789,"stem":799,"term":150,"__hash__":800},"glossary\u002Fglossary\u002Fsonic-horn.md",[564,565,566],"sonic horns","sonic cleaning horn","industrial sonic horn",{"type":53,"value":568,"toc":769},[569,602,606,614,618,686,690,725,729,737,739],[56,570,190,571,574,575,579,580,584,585,584,589,584,593,597,598,342],{},[60,572,573],{},"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 ",[65,576,578],{"href":577},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[65,581,583],{"href":582},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",", ",[65,586,588],{"href":587},"\u002Fglossary\u002Ffabric-filter","baghouses",[65,590,592],{"href":591},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[65,594,596],{"href":595},"\u002Fglossary\u002Fsuperheater","boiler heat-transfer surfaces"," and ",[65,599,601],{"href":600},"\u002Fglossary\u002Fhopper","hoppers and silos",[81,603,605],{"id":604},"how-a-sonic-horn-works","How a sonic horn works",[56,607,608,609,613],{},"Compressed plant air admitted through a ",[65,610,612],{"href":611},"\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.",[81,615,617],{"id":616},"key-parameters","Key parameters",[619,620,621,634],"table",{},[622,623,624],"thead",{},[625,626,627,631],"tr",{},[628,629,630],"th",{},"Parameter",[628,632,633],{},"Typical range",[635,636,637,646,654,662,670,678],"tbody",{},[625,638,639,643],{},[640,641,642],"td",{},"Fundamental frequency",[640,644,645],{},"60–400 Hz",[625,647,648,651],{},[640,649,650],{},"Sound pressure level",[640,652,653],{},"140–180 dB",[625,655,656,659],{},[640,657,658],{},"Compressed-air consumption",[640,660,661],{},"8–14 Nm³\u002Fmin at 4–7 bar",[625,663,664,667],{},[640,665,666],{},"Operating temperature (with appropriate materials)",[640,668,669],{},"−40 °C to +500 °C",[625,671,672,675],{},[640,673,674],{},"Firing cycle",[640,676,677],{},"5–15 s burst, repeated every 3–15 minutes",[625,679,680,683],{},[640,681,682],{},"Mass",[640,684,685],{},"15–60 kg depending on horn size",[81,687,689],{"id":688},"frequency-selection","Frequency selection",[56,691,692,693,584,695,699,700,584,704,708,709,584,712,716,717,597,721,342],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[65,694,241],{"href":240},[65,696,698],{"href":697},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters",", large ",[65,701,703],{"href":702},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[65,705,707],{"href":706},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[65,710,711],{"href":587},"fabric-filter compartments",[65,713,715],{"href":714},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[65,718,720],{"href":719},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[65,722,724],{"href":723},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[81,726,728],{"id":727},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[56,730,731,732,736],{},"Sonic horns are increasingly specified alongside or in place of ",[65,733,735],{"href":734},"\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.",[81,738,127],{"id":126},[86,740,741,746,752,758,764],{},[89,742,743],{},[65,744,745],{"href":577},"Acoustic cleaner",[89,747,748],{},[65,749,751],{"href":750},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[89,753,754],{},[65,755,757],{"href":756},"\u002Fglossary\u002Fbell-horn","Bell horn",[89,759,760],{},[65,761,763],{"href":762},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[89,765,766],{},[65,767,768],{"href":719},"Low-frequency acoustic cleaner",{"title":152,"searchDepth":153,"depth":153,"links":770},[771,772,773,774,775],{"id":604,"depth":153,"text":605},{"id":616,"depth":153,"text":617},{"id":688,"depth":153,"text":689},{"id":727,"depth":153,"text":728},{"id":126,"depth":153,"text":127},"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.",{},[780,781,782,783,784,785],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":787,"description":788},"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.",[790,793,796],{"title":791,"url":792},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":794,"url":795},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":797,"url":798},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613729187]