[{"data":1,"prerenderedAt":778},["ShallowReactive",2],{"site-footer-common":3,"glossary:waste-heat-boiler":45,"glossary-related:waste-heat-boiler":182},{"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":161,"description":162,"extension":163,"meta":164,"navigation":165,"path":166,"relatedTerms":167,"seo":172,"sources":175,"stem":179,"term":180,"__hash__":181},"glossary\u002Fglossary\u002Fwaste-heat-boiler.md","Waste-heat boiler (WHB)",[49,50,51],"WHB","waste heat boiler","process waste-heat boiler",{"type":53,"value":54,"toc":154},"minimark",[55,80,85,88,116,120,127,131],[56,57,58,59,63,64,69,70,74,75,79],"p",{},"A ",[60,61,62],"strong",{},"waste-heat boiler (WHB)"," is a tube-bundle steam generator that recovers heat from a process gas stream — typically ",[65,66,68],"a",{"href":67},"\u002Fglossary\u002Fclaus-unit-sulphur-recovery-unit","Claus SRU"," exhaust, sulphuric-acid plant SO₃ converter outlet, ",[65,71,73],{"href":72},"\u002Fglossary\u002Fbasic-oxygen-furnace","BOF"," off-gas, or similar process-side energy source — to generate steam for site use. Distinct from a ",[65,76,78],{"href":77},"\u002Fglossary\u002Fheat-recovery-steam-generator","heat-recovery steam generator (HRSG)",", which serves gas-turbine exhaust.",[81,82,84],"h2",{"id":83},"fouling-characteristics","Fouling characteristics",[56,86,87],{},"The fouling pattern depends on the source process:",[89,90,91,98,104,110],"ul",{},[92,93,94,97],"li",{},[60,95,96],{},"Claus SRU WHB"," — sulphur and ammonium-salt deposits on the tube sheet and economiser",[92,99,100,103],{},[60,101,102],{},"Sulphuric-acid plant WHB"," — sulphate and sulphuric-acid mist below the dew point",[92,105,106,109],{},[60,107,108],{},"BOF WHB"," — fine iron-oxide dust",[92,111,112,115],{},[60,113,114],{},"Metallurgical off-gas WHB"," — variable, depends on metal being processed",[81,117,119],{"id":118},"sonic-horn-duty","Sonic-horn duty",[56,121,122,126],{},[65,123,125],{"href":124},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," on WHB economiser sections and downstream dust hoppers are common where the process side produces particulate-laden gas. Particularly valuable on SRU WHBs where ammonium-salt deposits consolidate quickly and resist conventional cleaning.",[81,128,130],{"id":129},"related-terms","Related terms",[89,132,133,138,143,149],{},[92,134,135],{},[65,136,137],{"href":67},"Claus unit \u002F sulphur recovery unit (SRU)",[92,139,140],{},[65,141,142],{"href":77},"Heat Recovery Steam Generator (HRSG)",[92,144,145],{},[65,146,148],{"href":147},"\u002Fglossary\u002Feconomiser","Economiser",[92,150,151],{},[65,152,153],{"href":124},"Sonic horn",{"title":155,"searchDepth":156,"depth":156,"links":157},"",2,[158,159,160],{"id":83,"depth":156,"text":84},{"id":118,"depth":156,"text":119},{"id":129,"depth":156,"text":130},"steel-refining","A waste-heat boiler (WHB) is a tube-bundle steam generator that recovers heat from a process gas stream — typically Claus SRU exhaust, sulphuric-acid plant SO₃ converter outlet, BOF off-gas, or similar process-side energy source — to generate steam for site use. Distinct from a heat-recovery steam generator (HRSG), which serves gas-turbine exhaust.","md",{},true,"\u002Fglossary\u002Fwaste-heat-boiler",[168,169,170,171],"claus-unit-sulphur-recovery-unit","heat-recovery-steam-generator","economiser","sonic-horn",{"title":173,"description":174},"Waste-heat boiler (WHB) — process-heat recovery in refineries and metallurgical plants","A waste-heat boiler recovers heat from a process gas stream — Claus SRU exhaust, BOF off-gas, sulphuric-acid converter — to generate steam. Fouling pattern depends on the source process.",[176],{"title":177,"url":178},"Wikipedia — Waste heat recovery unit","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FWaste_heat_recovery_unit","glossary\u002Fwaste-heat-boiler","Waste-heat boiler","2pH20pGkFtuT91_SNpSAZ1k0VF0Mswz7Q8G-CfLNgFQ",[183,273,403,537],{"id":184,"title":137,"aliases":185,"body":190,"category":161,"description":258,"extension":163,"meta":259,"navigation":165,"path":67,"relatedTerms":260,"seo":263,"sources":266,"stem":270,"term":271,"__hash__":272},"glossary\u002Fglossary\u002Fclaus-unit-sulphur-recovery-unit.md",[186,187,188,189],"SRU","Claus unit","Claus process","sulphur recovery",{"type":53,"value":191,"toc":253},[192,201,205,224,226,235,237],[56,193,58,194,196,197,200],{},[60,195,187],{}," — also called a ",[60,198,199],{},"sulphur recovery unit (SRU)"," — recovers elemental sulphur from H₂S-bearing acid gas in a refinery or gas-processing plant. The Claus process partially combusts H₂S to SO₂, then catalytically reacts the remainder of the H₂S with SO₂ to form liquid sulphur in two or three downstream converter stages.",[81,202,204],{"id":203},"cleaning-targets","Cleaning targets",[89,206,207,212,218],{},[92,208,209,211],{},[60,210,47],{}," downstream of the Claus reaction furnace — high-temperature economiser surfaces foul with ammonium-salt and sulphur deposits",[92,213,214,217],{},[60,215,216],{},"Sulphur condenser tubes"," — periodic external cleaning during outages",[92,219,220,223],{},[60,221,222],{},"Acid-gas line dust traps"," — particulate from upstream",[81,225,119],{"id":118},[56,227,228,230,231,234],{},[65,229,125],{"href":124}," on the SRU ",[65,232,233],{"href":166},"waste-heat boiler"," economiser keep ammonium-salt and sulphur deposits from consolidating between scheduled maintenance windows. The high-value, continuous-operation nature of SRUs makes the avoidance of unplanned shutdowns particularly valuable.",[81,236,130],{"id":129},[89,238,239,245,249],{},[92,240,241],{},[65,242,244],{"href":243},"\u002Fglossary\u002Freformer-furnace","Reformer furnace",[92,246,247],{},[65,248,180],{"href":166},[92,250,251],{},[65,252,153],{"href":124},{"title":155,"searchDepth":156,"depth":156,"links":254},[255,256,257],{"id":203,"depth":156,"text":204},{"id":118,"depth":156,"text":119},{"id":129,"depth":156,"text":130},"A Claus unit — also called a sulphur recovery unit (SRU) — recovers elemental sulphur from H₂S-bearing acid gas in a refinery or gas-processing plant. The Claus process partially combusts H₂S to SO₂, then catalytically reacts the remainder of the H₂S with SO₂ to form liquid sulphur in two or three downstream converter stages.",{},[261,262,171],"reformer-furnace","waste-heat-boiler",{"title":264,"description":265},"Claus unit \u002F sulphur recovery unit (SRU) — refinery sulphur recovery from acid gas","A Claus \u002F SRU unit recovers elemental sulphur from H2S-bearing refinery acid gas through partial combustion and catalytic conversion. WHB economiser fouling is the principal cleaning issue.",[267],{"title":268,"url":269},"Wikipedia — Claus process","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FClaus_process","glossary\u002Fclaus-unit-sulphur-recovery-unit","Claus unit and sulphur recovery unit","os2Fl8HbzDMtKV4zSS5J1E4xXbAACsWWNd6hglhrROk",{"id":274,"title":142,"aliases":275,"body":278,"category":382,"description":383,"extension":163,"meta":384,"navigation":165,"path":77,"relatedTerms":385,"seo":390,"sources":393,"stem":400,"term":401,"__hash__":402},"glossary\u002Fglossary\u002Fheat-recovery-steam-generator.md",[276,277],"HRSG","heat-recovery steam generator",{"type":53,"value":279,"toc":376},[280,290,294,302,306,309,338,342,347,349],[56,281,58,282,284,285,289],{},[60,283,142],{}," recovers heat from the exhaust of a gas turbine to generate steam — the second cycle of a ",[65,286,288],{"href":287},"\u002Fglossary\u002Fcombined-cycle-gas-turbine","combined-cycle gas turbine (CCGT)"," power plant. HRSGs raise overall plant efficiency from the ~38% of a simple-cycle gas turbine to 55–62% of a modern combined-cycle plant.",[81,291,293],{"id":292},"hrsg-layout","HRSG layout",[56,295,296,297,301],{},"A typical HRSG contains multiple ",[65,298,300],{"href":299},"\u002Fglossary\u002Ffinned-tube-harp-tube","finned-tube"," tube banks arranged in series along the gas-path direction: superheaters, evaporators, economisers, and (on units with SCR) the catalyst layers. Modern HRSGs operate at three pressure levels (HP, IP, LP) to maximise energy recovery from the cooling exhaust gas.",[81,303,305],{"id":304},"fouling","Fouling",[56,307,308],{},"HRSG fouling is generally lighter than coal-fired boiler fouling because gas-turbine exhaust contains far less particulate. The dominant fouling mechanisms are:",[89,310,311,320,326,332],{},[92,312,313,319],{},[60,314,315],{},[65,316,318],{"href":317},"\u002Fglossary\u002Fammonium-bisulphate","Ammonium bisulphate (ABS)"," on units with SCR — slipped ammonia + SO₃ from fuel sulphur condenses on finned tubes",[92,321,322,325],{},[60,323,324],{},"Fine ash deposition"," on finned-tube banks reducing heat transfer",[92,327,328,331],{},[60,329,330],{},"Duct-burner-driven"," particulate on units with supplementary firing",[92,333,334,337],{},[60,335,336],{},"Cold-end corrosion"," below the acid dew point on sulphur-bearing fuels",[81,339,341],{"id":340},"cleaning","Cleaning",[56,343,344,346],{},[65,345,125],{"href":124}," installed across the gas path are increasingly common on HRSG maintenance plans, particularly for keeping SCR catalyst layers and cold-end finned tubes clear of ABS without the need for offline water-wash campaigns.",[81,348,130],{"id":129},[89,350,351,356,361,367,372],{},[92,352,353],{},[65,354,355],{"href":287},"Combined-cycle gas turbine (CCGT)",[92,357,358],{},[65,359,360],{"href":299},"Finned tube \u002F harp tube",[92,362,363],{},[65,364,366],{"href":365},"\u002Fglossary\u002Fduct-burner","Duct burner",[92,368,369],{},[65,370,371],{"href":317},"Ammonium bisulphate",[92,373,374],{},[65,375,153],{"href":124},{"title":155,"searchDepth":156,"depth":156,"links":377},[378,379,380,381],{"id":292,"depth":156,"text":293},{"id":304,"depth":156,"text":305},{"id":340,"depth":156,"text":341},{"id":129,"depth":156,"text":130},"hrsg-gas-path","A Heat Recovery Steam Generator (HRSG) recovers heat from the exhaust of a gas turbine to generate steam — the second cycle of a combined-cycle gas turbine (CCGT) power plant. HRSGs raise overall plant efficiency from the ~38% of a simple-cycle gas turbine to 55–62% of a modern combined-cycle plant.",{},[386,387,388,389,171],"combined-cycle-gas-turbine","finned-tube-harp-tube","duct-burner","ammonium-bisulphate",{"title":391,"description":392},"Heat Recovery Steam Generator (HRSG) — convert gas-turbine exhaust to steam","An HRSG recovers heat from a gas turbine's exhaust to generate steam, the second cycle of a combined-cycle plant. Finned-tube ash deposition and ABS fouling are the main cleaning concerns.",[394,397],{"title":395,"url":396},"Wikipedia — Heat recovery steam generator","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FHeat_recovery_steam_generator",{"title":398,"url":399},"Combined Cycle Journal — Clean HRSG heat-transfer surfaces","https:\u002F\u002Fwww.ccj-online.com\u002Fclean-heat-transfer-surfaces-inside-and-out-to-keep-hrsgs-at-peak-efficiency\u002F","glossary\u002Fheat-recovery-steam-generator","Heat Recovery Steam Generator","2QpNZZDCPIfd-x3tx7w8wKqru7_s0rVDnW6E_FXNJVw",{"id":404,"title":148,"aliases":405,"body":408,"category":520,"description":521,"extension":163,"meta":522,"navigation":165,"path":147,"relatedTerms":523,"seo":528,"sources":531,"stem":535,"term":148,"__hash__":536},"glossary\u002Fglossary\u002Feconomiser.md",[406,407],"economizer","feedwater economiser",{"type":53,"value":409,"toc":514},[410,436,438,441,458,461,463,468,472,480,482],[56,411,412,413,415,416,420,421,425,426,430,431,435],{},"An ",[60,414,170],{}," is the tube bank in a boiler's ",[65,417,419],{"href":418},"\u002Fglossary\u002Fconvective-pass-backpass","convective pass"," that recovers residual heat from the flue gas by preheating boiler feedwater. It sits downstream of the ",[65,422,424],{"href":423},"\u002Fglossary\u002Freheater","reheater"," and upstream of the ",[65,427,429],{"href":428},"\u002Fglossary\u002Fair-heater","air heater","; economiser performance directly affects boiler ",[65,432,434],{"href":433},"\u002Fglossary\u002Fheat-rate","heat rate",".",[81,437,305],{"id":304},[56,439,440],{},"Two failure modes dominate:",[89,442,443,449],{},[92,444,445,448],{},[60,446,447],{},"Ash bridging"," between tubes — gas can no longer pass freely; ΔP across the economiser rises",[92,450,451,457],{},[60,452,453],{},[65,454,456],{"href":455},"\u002Fglossary\u002Flarge-particle-ash","Large-particle ash"," dropping out of the gas stream onto economiser hoppers — bridges and pluggage in the hopper itself",[56,459,460],{},"The first reduces gas-side heat transfer and forces gas channelling around the blocked area; the second causes hopper extraction to fail and back-pressures the gas path.",[81,462,119],{"id":118},[56,464,465,467],{},[65,466,125],{"href":124}," mounted on the economiser shell and hopper are particularly effective because economiser deposits are dry, friable and respond well to acoustic dislodging. Plants commonly report 1–2% boiler-efficiency recovery after horn installation on heavily-fouled economisers.",[81,469,471],{"id":470},"economiser-scr-adjacency","Economiser-SCR adjacency",[56,473,474,475,479],{},"On units with an upstream ",[65,476,478],{"href":477},"\u002Fglossary\u002Fhigh-dust-low-dust-tail-end-scr","high-dust SCR",", the economiser receives the same large-particle ash that the SCR is designed against. LPA screens between SCR and economiser are common; sonic horns help keep both surfaces clean.",[81,481,130],{"id":129},[89,483,484,490,495,501,506,510],{},[92,485,486],{},[65,487,489],{"href":488},"\u002Fglossary\u002Fboiler","Boiler",[92,491,492],{},[65,493,494],{"href":418},"Convective pass \u002F backpass",[92,496,497],{},[65,498,500],{"href":499},"\u002Fglossary\u002Fsuperheater","Superheater",[92,502,503],{},[65,504,505],{"href":428},"Air heater",[92,507,508],{},[65,509,456],{"href":455},[92,511,512],{},[65,513,153],{"href":124},{"title":155,"searchDepth":156,"depth":156,"links":515},[516,517,518,519],{"id":304,"depth":156,"text":305},{"id":118,"depth":156,"text":119},{"id":470,"depth":156,"text":471},{"id":129,"depth":156,"text":130},"boiler","An economiser is the tube bank in a boiler's convective pass that recovers residual heat from the flue gas by preheating boiler feedwater. It sits downstream of the reheater and upstream of the air heater; economiser performance directly affects boiler heat rate.",{},[520,524,525,526,527,171],"convective-pass-backpass","superheater","air-heater","large-particle-ash",{"title":529,"description":530},"Economiser — final tube bank that preheats feedwater with flue-gas heat","An economiser is the final tube bank in a boiler's convective pass that recovers heat from the flue gas by preheating feedwater. Ash bridging in the economiser is a routine cleaning challenge.",[532],{"title":533,"url":534},"Wikipedia — Economizer","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FEconomizer","glossary\u002Feconomiser","kh4Q3Eo9CNl35_b843VUXSI8fDZuiLZqLyB__NSzVH4",{"id":538,"title":153,"aliases":539,"body":543,"category":753,"description":754,"extension":163,"meta":755,"navigation":165,"path":124,"relatedTerms":756,"seo":763,"sources":766,"stem":776,"term":153,"__hash__":777},"glossary\u002Fglossary\u002Fsonic-horn.md",[540,541,542],"sonic horns","sonic cleaning horn","industrial sonic horn",{"type":53,"value":544,"toc":746},[545,577,581,589,593,661,665,702,706,714,716],[56,546,58,547,550,551,555,556,560,561,560,565,560,569,572,573,435],{},[60,548,549],{},"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 ",[65,552,554],{"href":553},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[65,557,559],{"href":558},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",", ",[65,562,564],{"href":563},"\u002Fglossary\u002Ffabric-filter","baghouses",[65,566,568],{"href":567},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[65,570,571],{"href":499},"boiler heat-transfer surfaces"," and ",[65,574,576],{"href":575},"\u002Fglossary\u002Fhopper","hoppers and silos",[81,578,580],{"id":579},"how-a-sonic-horn-works","How a sonic horn works",[56,582,583,584,588],{},"Compressed plant air admitted through a ",[65,585,587],{"href":586},"\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.",[81,590,592],{"id":591},"key-parameters","Key parameters",[594,595,596,609],"table",{},[597,598,599],"thead",{},[600,601,602,606],"tr",{},[603,604,605],"th",{},"Parameter",[603,607,608],{},"Typical range",[610,611,612,621,629,637,645,653],"tbody",{},[600,613,614,618],{},[615,616,617],"td",{},"Fundamental frequency",[615,619,620],{},"60–400 Hz",[600,622,623,626],{},[615,624,625],{},"Sound pressure level",[615,627,628],{},"140–180 dB",[600,630,631,634],{},[615,632,633],{},"Compressed-air consumption",[615,635,636],{},"8–14 Nm³\u002Fmin at 4–7 bar",[600,638,639,642],{},[615,640,641],{},"Operating temperature (with appropriate materials)",[615,643,644],{},"−40 °C to +500 °C",[600,646,647,650],{},[615,648,649],{},"Firing cycle",[615,651,652],{},"5–15 s burst, repeated every 3–15 minutes",[600,654,655,658],{},[615,656,657],{},"Mass",[615,659,660],{},"15–60 kg depending on horn size",[81,662,664],{"id":663},"frequency-selection","Frequency selection",[56,666,667,668,560,672,676,677,560,681,685,686,560,689,693,694,572,698,435],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[65,669,671],{"href":670},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[65,673,675],{"href":674},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters",", large ",[65,678,680],{"href":679},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[65,682,684],{"href":683},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[65,687,688],{"href":563},"fabric-filter compartments",[65,690,692],{"href":691},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[65,695,697],{"href":696},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[65,699,701],{"href":700},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[81,703,705],{"id":704},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[56,707,708,709,713],{},"Sonic horns are increasingly specified alongside or in place of ",[65,710,712],{"href":711},"\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.",[81,715,130],{"id":129},[89,717,718,723,729,735,741],{},[92,719,720],{},[65,721,722],{"href":553},"Acoustic cleaner",[92,724,725],{},[65,726,728],{"href":727},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[92,730,731],{},[65,732,734],{"href":733},"\u002Fglossary\u002Fbell-horn","Bell horn",[92,736,737],{},[65,738,740],{"href":739},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[92,742,743],{},[65,744,745],{"href":696},"Low-frequency acoustic cleaner",{"title":155,"searchDepth":156,"depth":156,"links":747},[748,749,750,751,752],{"id":579,"depth":156,"text":580},{"id":591,"depth":156,"text":592},{"id":663,"depth":156,"text":664},{"id":704,"depth":156,"text":705},{"id":129,"depth":156,"text":130},"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.",{},[757,758,759,760,761,762],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":764,"description":765},"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.",[767,770,773],{"title":768,"url":769},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":771,"url":772},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":774,"url":775},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613757866]