[{"data":1,"prerenderedAt":799},["ShallowReactive",2],{"site-footer-common":3,"glossary:finned-tube-harp-tube":45,"glossary-related:finned-tube-harp-tube":159},{"id":4,"extension":5,"footer":6,"meta":40,"navbar":41,"stem":43,"__hash__":44},"common\u002Fcommon.yml","yml",{"tagline":7,"links":8,"sections":9},"Acoustic cleaning intelligence for industrial fouling, soot, ash, dust and build-up.",[],[10,19,31],{"title":11,"links":12},"Product",[13,16],{"label":14,"to":15},"How it works","\u002F#product",{"label":17,"to":18},"Cost assessment","\u002F#hero",{"title":20,"links":21},"Company",[22,25,28],{"label":23,"to":24},"What we build","\u002F#about",{"label":26,"to":27},"Careers","\u002F#careers",{"label":29,"to":30},"Contact","\u002F#contact",{"title":32,"links":33},"Resources",[34,37],{"label":35,"to":36},"Blog","\u002Fresources\u002Fblog",{"label":38,"to":39},"Glossary","\u002Fglossary",{},{"links":42},[],"common","YocmZRy1AYfBbpgGVms-zhdiABlF8VTxHx6h4rDmZBA",{"id":46,"title":47,"aliases":48,"body":53,"category":140,"description":141,"extension":142,"meta":143,"navigation":144,"path":145,"relatedTerms":146,"seo":149,"sources":152,"stem":156,"term":157,"__hash__":158},"glossary\u002Fglossary\u002Ffinned-tube-harp-tube.md","Finned tube \u002F harp tube",[49,50,51,52],"finned tubes","harp tube","extended-surface tube","HRSG harp",{"type":54,"value":55,"toc":133},"minimark",[56,71,86,91,94,98,105,109],[57,58,59,60,64,65,70],"p",{},"A ",[61,62,63],"strong",{},"finned tube"," carries helically-wound (or stud-welded) metal fins on its outside surface, multiplying the gas-side heat-transfer area by 5–10× compared with a bare tube. Finned tubes are universal in ",[66,67,69],"a",{"href":68},"\u002Fglossary\u002Fheat-recovery-steam-generator","HRSGs"," because gas-side heat transfer (low-pressure exhaust gas) is the limiting factor — adding fins is the standard way to compensate.",[57,72,59,73,75,76,80,81,85],{},[61,74,50],{}," is the assembled vertical bundle of finned tubes that forms one tube bank inside the HRSG, named for its resemblance to a harp string array. Multiple harps in series make up the ",[66,77,79],{"href":78},"\u002Fglossary\u002Feconomiser","economiser",", evaporator and ",[66,82,84],{"href":83},"\u002Fglossary\u002Fsuperheater","superheater"," sections.",[87,88,90],"h2",{"id":89},"why-finned-surfaces-foul-easily","Why finned surfaces foul easily",[57,92,93],{},"The narrow gap between fins (3–10 mm typical pitch) is geometrically sensitive: even a thin deposit on the fin face significantly restricts the gas flow path between fins. Particulate that would pass through a bare-tube bank settles between fins and consolidates over time.",[87,95,97],{"id":96},"cleaning","Cleaning",[57,99,100,104],{},[66,101,103],{"href":102},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," installed across HRSG harps keep the fin gaps clear. Sound waves penetrate between fins more effectively than steam-jet sootblowers, which struggle to project energy into the narrow inter-fin space. Combined sonic-and-sootblower cleaning regimes maintain HRSG heat transfer through the operating campaign.",[87,106,108],{"id":107},"related-terms","Related terms",[110,111,112,118,123,128],"ul",{},[113,114,115],"li",{},[66,116,117],{"href":68},"Heat Recovery Steam Generator (HRSG)",[113,119,120],{},[66,121,122],{"href":78},"Economiser",[113,124,125],{},[66,126,127],{"href":83},"Superheater",[113,129,130],{},[66,131,132],{"href":102},"Sonic horn",{"title":134,"searchDepth":135,"depth":135,"links":136},"",2,[137,138,139],{"id":89,"depth":135,"text":90},{"id":96,"depth":135,"text":97},{"id":107,"depth":135,"text":108},"hrsg-gas-path","A finned tube carries helically-wound (or stud-welded) metal fins on its outside surface, multiplying the gas-side heat-transfer area by 5–10× compared with a bare tube. Finned tubes are universal in HRSGs because gas-side heat transfer (low-pressure exhaust gas) is the limiting factor — adding fins is the standard way to compensate.","md",{},true,"\u002Fglossary\u002Ffinned-tube-harp-tube",[147,79,84,148],"heat-recovery-steam-generator","sonic-horn",{"title":150,"description":151},"Finned tube and harp tube — extended-surface tubes for HRSG heat transfer","Finned tubes carry helically-wound fins to multiply gas-side surface area in HRSGs. Harp tubes are the vertical bundle configuration. Fin geometry is particularly fouling-sensitive.",[153],{"title":154,"url":155},"Wikipedia — Heat recovery steam generator","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FHeat_recovery_steam_generator","glossary\u002Ffinned-tube-harp-tube","Finned tube and harp tube","FPHrkmT6ywb1eMnRbmeu0wDTvbn2kby9DVOqaObqYZU",[160,283,416,567],{"id":161,"title":117,"aliases":162,"body":165,"category":140,"description":265,"extension":142,"meta":266,"navigation":144,"path":68,"relatedTerms":267,"seo":272,"sources":275,"stem":280,"term":281,"__hash__":282},"glossary\u002Fglossary\u002Fheat-recovery-steam-generator.md",[163,164],"HRSG","heat-recovery steam generator",{"type":54,"value":166,"toc":259},[167,177,181,188,192,195,224,226,231,233],[57,168,59,169,171,172,176],{},[61,170,117],{}," recovers heat from the exhaust of a gas turbine to generate steam — the second cycle of a ",[66,173,175],{"href":174},"\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.",[87,178,180],{"id":179},"hrsg-layout","HRSG layout",[57,182,183,184,187],{},"A typical HRSG contains multiple ",[66,185,186],{"href":145},"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.",[87,189,191],{"id":190},"fouling","Fouling",[57,193,194],{},"HRSG fouling is generally lighter than coal-fired boiler fouling because gas-turbine exhaust contains far less particulate. The dominant fouling mechanisms are:",[110,196,197,206,212,218],{},[113,198,199,205],{},[61,200,201],{},[66,202,204],{"href":203},"\u002Fglossary\u002Fammonium-bisulphate","Ammonium bisulphate (ABS)"," on units with SCR — slipped ammonia + SO₃ from fuel sulphur condenses on finned tubes",[113,207,208,211],{},[61,209,210],{},"Fine ash deposition"," on finned-tube banks reducing heat transfer",[113,213,214,217],{},[61,215,216],{},"Duct-burner-driven"," particulate on units with supplementary firing",[113,219,220,223],{},[61,221,222],{},"Cold-end corrosion"," below the acid dew point on sulphur-bearing fuels",[87,225,97],{"id":96},[57,227,228,230],{},[66,229,103],{"href":102}," 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.",[87,232,108],{"id":107},[110,234,235,240,244,250,255],{},[113,236,237],{},[66,238,239],{"href":174},"Combined-cycle gas turbine (CCGT)",[113,241,242],{},[66,243,47],{"href":145},[113,245,246],{},[66,247,249],{"href":248},"\u002Fglossary\u002Fduct-burner","Duct burner",[113,251,252],{},[66,253,254],{"href":203},"Ammonium bisulphate",[113,256,257],{},[66,258,132],{"href":102},{"title":134,"searchDepth":135,"depth":135,"links":260},[261,262,263,264],{"id":179,"depth":135,"text":180},{"id":190,"depth":135,"text":191},{"id":96,"depth":135,"text":97},{"id":107,"depth":135,"text":108},"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.",{},[268,269,270,271,148],"combined-cycle-gas-turbine","finned-tube-harp-tube","duct-burner","ammonium-bisulphate",{"title":273,"description":274},"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.",[276,277],{"title":154,"url":155},{"title":278,"url":279},"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":284,"title":122,"aliases":285,"body":288,"category":400,"description":401,"extension":142,"meta":402,"navigation":144,"path":78,"relatedTerms":403,"seo":407,"sources":410,"stem":414,"term":122,"__hash__":415},"glossary\u002Fglossary\u002Feconomiser.md",[286,287],"economizer","feedwater economiser",{"type":54,"value":289,"toc":394},[290,316,318,321,338,341,345,350,354,362,364],[57,291,292,293,295,296,300,301,305,306,310,311,315],{},"An ",[61,294,79],{}," is the tube bank in a boiler's ",[66,297,299],{"href":298},"\u002Fglossary\u002Fconvective-pass-backpass","convective pass"," that recovers residual heat from the flue gas by preheating boiler feedwater. It sits downstream of the ",[66,302,304],{"href":303},"\u002Fglossary\u002Freheater","reheater"," and upstream of the ",[66,307,309],{"href":308},"\u002Fglossary\u002Fair-heater","air heater","; economiser performance directly affects boiler ",[66,312,314],{"href":313},"\u002Fglossary\u002Fheat-rate","heat rate",".",[87,317,191],{"id":190},[57,319,320],{},"Two failure modes dominate:",[110,322,323,329],{},[113,324,325,328],{},[61,326,327],{},"Ash bridging"," between tubes — gas can no longer pass freely; ΔP across the economiser rises",[113,330,331,337],{},[61,332,333],{},[66,334,336],{"href":335},"\u002Fglossary\u002Flarge-particle-ash","Large-particle ash"," dropping out of the gas stream onto economiser hoppers — bridges and pluggage in the hopper itself",[57,339,340],{},"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.",[87,342,344],{"id":343},"sonic-horn-duty","Sonic-horn duty",[57,346,347,349],{},[66,348,103],{"href":102}," 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.",[87,351,353],{"id":352},"economiser-scr-adjacency","Economiser-SCR adjacency",[57,355,356,357,361],{},"On units with an upstream ",[66,358,360],{"href":359},"\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.",[87,363,108],{"id":107},[110,365,366,372,377,381,386,390],{},[113,367,368],{},[66,369,371],{"href":370},"\u002Fglossary\u002Fboiler","Boiler",[113,373,374],{},[66,375,376],{"href":298},"Convective pass \u002F backpass",[113,378,379],{},[66,380,127],{"href":83},[113,382,383],{},[66,384,385],{"href":308},"Air heater",[113,387,388],{},[66,389,336],{"href":335},[113,391,392],{},[66,393,132],{"href":102},{"title":134,"searchDepth":135,"depth":135,"links":395},[396,397,398,399],{"id":190,"depth":135,"text":191},{"id":343,"depth":135,"text":344},{"id":352,"depth":135,"text":353},{"id":107,"depth":135,"text":108},"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.",{},[400,404,84,405,406,148],"convective-pass-backpass","air-heater","large-particle-ash",{"title":408,"description":409},"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.",[411],{"title":412,"url":413},"Wikipedia — Economizer","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FEconomizer","glossary\u002Feconomiser","kh4Q3Eo9CNl35_b843VUXSI8fDZuiLZqLyB__NSzVH4",{"id":417,"title":127,"aliases":418,"body":423,"category":400,"description":553,"extension":142,"meta":554,"navigation":144,"path":83,"relatedTerms":555,"seo":558,"sources":561,"stem":565,"term":127,"__hash__":566},"glossary\u002Fglossary\u002Fsuperheater.md",[419,420,421,422],"superheaters","primary superheater","secondary superheater","finishing superheater",{"type":54,"value":424,"toc":548},[425,433,435,477,479,490,514,517,519],[57,426,59,427,429,430,432],{},[61,428,84],{}," is a tube bank in a boiler's ",[66,431,299],{"href":298}," that raises the steam temperature beyond its saturation point using residual heat from the flue gas. Most utility boilers have at least two superheater stages: a primary superheater (cooler gas) and a secondary or finishing superheater (closest to the furnace, hottest gas).",[87,434,191],{"id":190},[110,436,437,451,457],{},[113,438,439,445,446,450],{},[61,440,441],{},[66,442,444],{"href":443},"\u002Fglossary\u002Fslagging","Slagging"," on the finishing superheater — semi-molten ash from the ",[66,447,449],{"href":448},"\u002Fglossary\u002Ffurnace","furnace"," deposits on the hottest tubes",[113,452,453,456],{},[61,454,455],{},"Bonded ash"," on the primary superheater — drier deposits that sinter under sustained temperature",[113,458,459,462,463,467,468,471,472,476],{},[61,460,461],{},"Sodium \u002F potassium-rich deposits"," on ",[66,464,466],{"href":465},"\u002Fglossary\u002Fwaste-to-energy","biomass",", ",[66,469,470],{"href":465},"WtE"," and ",[66,473,475],{"href":474},"\u002Fglossary\u002Frecovery-boiler","recovery boilers"," — sticky, low-melting, aggressive",[87,478,97],{"id":96},[57,480,481,482,471,486,489],{},"Steam ",[66,483,485],{"href":484},"\u002Fglossary\u002Fsteam-sootblower","sootblowers",[66,487,488],{"href":102},"sonic horns"," work together:",[110,491,492,495,503],{},[113,493,494],{},"Sootblowers attack hard slag on the finishing superheater",[113,496,497,498,502],{},"Sonic horns (",[66,499,501],{"href":500},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","60–125 Hz",") keep dry ash from consolidating on the primary superheater and convective superheater",[113,504,505,509,510,513],{},[66,506,508],{"href":507},"\u002Fglossary\u002Finfrasonic-cleaner","Infrasonic cleaners"," below 30 Hz are used on deep ",[66,511,512],{"href":474},"recovery-boiler"," superheater cavities",[57,515,516],{},"The combination extends the interval between major water-washes and reduces steam-attemperation requirements that mask deteriorating heat transfer.",[87,518,108],{"id":107},[110,520,521,525,529,534,538,542],{},[113,522,523],{},[66,524,371],{"href":370},[113,526,527],{},[66,528,376],{"href":298},[113,530,531],{},[66,532,533],{"href":303},"Reheater",[113,535,536],{},[66,537,444],{"href":443},[113,539,540],{},[66,541,132],{"href":102},[113,543,544],{},[66,545,547],{"href":546},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",{"title":134,"searchDepth":135,"depth":135,"links":549},[550,551,552],{"id":190,"depth":135,"text":191},{"id":96,"depth":135,"text":97},{"id":107,"depth":135,"text":108},"A superheater is a tube bank in a boiler's convective pass that raises the steam temperature beyond its saturation point using residual heat from the flue gas. Most utility boilers have at least two superheater stages: a primary superheater (cooler gas) and a secondary or finishing superheater (closest to the furnace, hottest gas).",{},[400,404,304,556,148,557],"slagging","sonic-sootblower",{"title":559,"description":560},"Superheater — boiler tube bank that raises steam temperature beyond saturation","A superheater is a tube bank that raises steam temperature beyond the saturation point using flue-gas heat. Sticky alkali ash and slag deposits are the dominant fouling concerns.",[562],{"title":563,"url":564},"Wikipedia — Superheater","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSuperheater","glossary\u002Fsuperheater","hYVXyyVmlWCU3AXfAl0l3YAhHpWty_akkDsBJGC_NDs",{"id":568,"title":132,"aliases":569,"body":572,"category":775,"description":776,"extension":142,"meta":777,"navigation":144,"path":102,"relatedTerms":778,"seo":784,"sources":787,"stem":797,"term":132,"__hash__":798},"glossary\u002Fglossary\u002Fsonic-horn.md",[488,570,571],"sonic cleaning horn","industrial sonic horn",{"type":54,"value":573,"toc":768},[574,604,608,616,620,688,692,727,731,738,740],[57,575,59,576,579,580,584,585,467,589,467,593,467,597,471,600,315],{},[61,577,578],{},"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 ",[66,581,583],{"href":582},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[66,586,588],{"href":587},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",[66,590,592],{"href":591},"\u002Fglossary\u002Ffabric-filter","baghouses",[66,594,596],{"href":595},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[66,598,599],{"href":83},"boiler heat-transfer surfaces",[66,601,603],{"href":602},"\u002Fglossary\u002Fhopper","hoppers and silos",[87,605,607],{"id":606},"how-a-sonic-horn-works","How a sonic horn works",[57,609,610,611,615],{},"Compressed plant air admitted through a ",[66,612,614],{"href":613},"\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.",[87,617,619],{"id":618},"key-parameters","Key parameters",[621,622,623,636],"table",{},[624,625,626],"thead",{},[627,628,629,633],"tr",{},[630,631,632],"th",{},"Parameter",[630,634,635],{},"Typical range",[637,638,639,648,656,664,672,680],"tbody",{},[627,640,641,645],{},[642,643,644],"td",{},"Fundamental frequency",[642,646,647],{},"60–400 Hz",[627,649,650,653],{},[642,651,652],{},"Sound pressure level",[642,654,655],{},"140–180 dB",[627,657,658,661],{},[642,659,660],{},"Compressed-air consumption",[642,662,663],{},"8–14 Nm³\u002Fmin at 4–7 bar",[627,665,666,669],{},[642,667,668],{},"Operating temperature (with appropriate materials)",[642,670,671],{},"−40 °C to +500 °C",[627,673,674,677],{},[642,675,676],{},"Firing cycle",[642,678,679],{},"5–15 s burst, repeated every 3–15 minutes",[627,681,682,685],{},[642,683,684],{},"Mass",[642,686,687],{},"15–60 kg depending on horn size",[87,689,691],{"id":690},"frequency-selection","Frequency selection",[57,693,694,695,467,699,702,703,467,707,711,712,467,715,719,720,471,723,315],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[66,696,698],{"href":697},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[66,700,701],{"href":474},"recovery-boiler superheaters",", large ",[66,704,706],{"href":705},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[66,708,710],{"href":709},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[66,713,714],{"href":591},"fabric-filter compartments",[66,716,718],{"href":717},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[66,721,722],{"href":500},"low-frequency acoustic cleaner",[66,724,726],{"href":725},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[87,728,730],{"id":729},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[57,732,733,734,737],{},"Sonic horns are increasingly specified alongside or in place of ",[66,735,736],{"href":484},"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.",[87,739,108],{"id":107},[110,741,742,747,751,757,763],{},[113,743,744],{},[66,745,746],{"href":582},"Acoustic cleaner",[113,748,749],{},[66,750,547],{"href":546},[113,752,753],{},[66,754,756],{"href":755},"\u002Fglossary\u002Fbell-horn","Bell horn",[113,758,759],{},[66,760,762],{"href":761},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[113,764,765],{},[66,766,767],{"href":500},"Low-frequency acoustic cleaner",{"title":134,"searchDepth":135,"depth":135,"links":769},[770,771,772,773,774],{"id":606,"depth":135,"text":607},{"id":618,"depth":135,"text":619},{"id":690,"depth":135,"text":691},{"id":729,"depth":135,"text":730},{"id":107,"depth":135,"text":108},"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.",{},[779,780,557,781,782,783],"acoustic-cleaner","acoustic-cleaning-system","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":785,"description":786},"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.",[788,791,794],{"title":789,"url":790},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":792,"url":793},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":795,"url":796},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613743242]