[{"data":1,"prerenderedAt":865},["ShallowReactive",2],{"site-footer-common":3,"glossary:heat-transfer-surface-fouling":45,"glossary-related:heat-transfer-surface-fouling":214},{"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":51,"category":195,"description":196,"extension":197,"meta":198,"navigation":199,"path":200,"relatedTerms":201,"seo":205,"sources":208,"stem":212,"term":47,"__hash__":213},"glossary\u002Fglossary\u002Fheat-transfer-surface-fouling.md","Heat-transfer surface fouling",[49,50],"HTS fouling","heat transfer fouling",{"type":52,"value":53,"toc":188},"minimark",[54,67,72,75,135,148,152,159,163],[55,56,57,60,61,66],"p",{},[58,59,47],"strong",{}," is the engineering term for ",[62,63,65],"a",{"href":64},"\u002Fglossary\u002Ftube-fouling","tube fouling"," viewed from the thermodynamic-impact angle. A fouling layer adds a thermal-resistance term in series with the underlying tube wall and the inside\u002Foutside film coefficients, reducing the overall heat-transfer coefficient (U) for the tube.",[68,69,71],"h2",{"id":70},"quantifying-the-effect","Quantifying the effect",[55,73,74],{},"The added fouling resistance R_f is reported in m²·K\u002FW (or h·ft²·°F\u002FBtu in US units). Typical published values:",[76,77,78,91],"table",{},[79,80,81],"thead",{},[82,83,84,88],"tr",{},[85,86,87],"th",{},"Service",[85,89,90],{},"R_f (m²·K\u002FW)",[92,93,94,103,111,119,127],"tbody",{},[82,95,96,100],{},[97,98,99],"td",{},"Clean steam-side",[97,101,102],{},"0",[82,104,105,108],{},[97,106,107],{},"Clean coal-fired boiler gas-side",[97,109,110],{},"~0.0005",[82,112,113,116],{},[97,114,115],{},"Fouled coal-fired economiser",[97,117,118],{},"0.001–0.003",[82,120,121,124],{},[97,122,123],{},"Heavily-fouled biomass \u002F WtE superheater",[97,125,126],{},"0.005+",[82,128,129,132],{},[97,130,131],{},"Acid-dew-point-corroded air heater",[97,133,134],{},"severe + corrosion",[55,136,137,138,142,143,147],{},"Doubling R_f roughly halves the ",[139,140,141],"em",{},"useful"," heat-transfer coefficient for the surface, with proportional impact on ",[62,144,146],{"href":145},"\u002Fglossary\u002Fheat-rate","heat rate",".",[68,149,151],{"id":150},"why-sonic-horns-matter-here","Why sonic horns matter here",[55,153,154,158],{},[62,155,157],{"href":156},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," keep R_f close to its design value over the operating campaign by preventing the friable-to-bonded transition that drives R_f up. Plants commonly report 1–3% heat-rate improvement on retrofitting horns to a unit with established fouling drift.",[68,160,162],{"id":161},"related-terms","Related terms",[164,165,166,172,178,183],"ul",{},[167,168,169],"li",{},[62,170,171],{"href":64},"Tube fouling",[167,173,174],{},[62,175,177],{"href":176},"\u002Fglossary\u002Ffouling","Fouling",[167,179,180],{},[62,181,182],{"href":145},"Heat rate",[167,184,185],{},[62,186,187],{"href":156},"Sonic horn",{"title":189,"searchDepth":190,"depth":190,"links":191},"",2,[192,193,194],{"id":70,"depth":190,"text":71},{"id":150,"depth":190,"text":151},{"id":161,"depth":190,"text":162},"fouling","Heat-transfer surface fouling is the engineering term for tube fouling viewed from the thermodynamic-impact angle. A fouling layer adds a thermal-resistance term in series with the underlying tube wall and the inside\u002Foutside film coefficients, reducing the overall heat-transfer coefficient (U) for the tube.","md",{},true,"\u002Fglossary\u002Fheat-transfer-surface-fouling",[202,195,203,204],"tube-fouling","heat-rate","sonic-horn",{"title":206,"description":207},"Heat-transfer surface fouling — the economic-impact framing of tube fouling","Heat-transfer surface fouling describes tube fouling from the economic-impact angle: thermal-resistance addition that reduces heat absorption and degrades plant heat rate.",[209],{"title":210,"url":211},"Wikipedia — Fouling","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FFouling","glossary\u002Fheat-transfer-surface-fouling","HOgx9fE9OodHg7wlwZ1yOIB394kDR0pB_D6XdluG3VA",[215,346,519,640],{"id":216,"title":171,"aliases":217,"body":220,"category":195,"description":333,"extension":197,"meta":334,"navigation":199,"path":64,"relatedTerms":335,"seo":339,"sources":342,"stem":344,"term":171,"__hash__":345},"glossary\u002Fglossary\u002Ftube-fouling.md",[218,219],"boiler tube fouling","heat exchanger tube fouling",{"type":52,"value":221,"toc":328},[222,254,258,288,292,302,304],[55,223,224,226,227,231,232,231,236,231,240,231,244,248,249,253],{},[58,225,171],{}," is the umbrella term for deposit accumulation on the gas-side outer surface of boiler and heat-exchanger tubes — ",[62,228,230],{"href":229},"\u002Fglossary\u002Feconomiser","economisers",", ",[62,233,235],{"href":234},"\u002Fglossary\u002Fsuperheater","superheaters",[62,237,239],{"href":238},"\u002Fglossary\u002Freheater","reheaters",[62,241,243],{"href":242},"\u002Fglossary\u002Fair-heater","air heaters",[62,245,247],{"href":246},"\u002Fglossary\u002Fheat-recovery-steam-generator","HRSG"," harps, ",[62,250,252],{"href":251},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler"," banks. The specific deposit composition varies by application, but the operational consequences are common.",[68,255,257],{"id":256},"what-tube-fouling-does","What tube fouling does",[164,259,260,266,276,282],{},[167,261,262,265],{},[58,263,264],{},"Insulates"," the tube from the gas, reducing heat transfer",[167,267,268,271,272],{},[58,269,270],{},"Raises"," flue-gas-side pressure drop, derating the ",[62,273,275],{"href":274},"\u002Fglossary\u002Fid-fan","ID fan",[167,277,278,281],{},[58,279,280],{},"Bonds chemically"," with the tube surface, creating local corrosion sites",[167,283,284,287],{},[58,285,286],{},"Channels"," gas flow around blocked passages, leaving fouled tubes worse and unfouled tubes overworked",[68,289,291],{"id":290},"cleaning-toolkit","Cleaning toolkit",[55,293,294,296,297,301],{},[62,295,157],{"href":156}," prevent the early consolidation phase of tube fouling. Steam ",[62,298,300],{"href":299},"\u002Fglossary\u002Fsteam-sootblower","sootblowers"," attack thicker deposits. Periodic offline water-washing or chemical cleaning addresses what neither can manage.",[68,303,162],{"id":161},[164,305,306,310,315,320,324],{},[167,307,308],{},[62,309,177],{"href":176},[167,311,312],{},[62,313,314],{"href":229},"Economiser",[167,316,317],{},[62,318,319],{"href":234},"Superheater",[167,321,322],{},[62,323,47],{"href":200},[167,325,326],{},[62,327,187],{"href":156},{"title":189,"searchDepth":190,"depth":190,"links":329},[330,331,332],{"id":256,"depth":190,"text":257},{"id":290,"depth":190,"text":291},{"id":161,"depth":190,"text":162},"Tube fouling is the umbrella term for deposit accumulation on the gas-side outer surface of boiler and heat-exchanger tubes — economisers, superheaters, reheaters, air heaters, HRSG harps, recovery-boiler banks. The specific deposit composition varies by application, but the operational consequences are common.",{},[195,336,337,338,204],"economiser","superheater","heat-transfer-surface-fouling",{"title":340,"description":341},"Tube fouling — accumulation of deposits on the outside of boiler and heat-exchanger tubes","Tube fouling is the umbrella term for deposit accumulation on the gas-side surfaces of boiler and heat-exchanger tubes. Reduces heat transfer, increases ΔP, accelerates corrosion.",[343],{"title":210,"url":211},"glossary\u002Ftube-fouling","wQLuzxRUKMwjdt8goiQ2fgLvMCO0N2LoANrxSi8XukM",{"id":347,"title":177,"aliases":348,"body":351,"category":195,"description":507,"extension":197,"meta":508,"navigation":199,"path":176,"relatedTerms":509,"seo":511,"sources":514,"stem":516,"term":517,"__hash__":518},"glossary\u002Fglossary\u002Ffouling.md",[349,350],"process fouling","heat-transfer fouling",{"type":52,"value":352,"toc":502},[353,413,417,455,459,469,471],[55,354,355,357,358,231,362,231,366,231,370,231,374,231,378,231,381,231,385,388,389,231,393,231,397,231,401,231,405,231,409,412],{},[58,356,177],{}," is the accumulation of unwanted deposits on the surfaces of process equipment. It is the universal phenomenon that connects every application Sylio addresses: ",[62,359,361],{"href":360},"\u002Fglossary\u002Fboiler","boilers",[62,363,365],{"href":364},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",[62,367,369],{"href":368},"\u002Fglossary\u002Fbaghouse","baghouses",[62,371,373],{"href":372},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[62,375,377],{"href":376},"\u002Fglossary\u002Fhopper","hoppers and silos",[62,379,380],{"href":246},"HRSGs",[62,382,384],{"href":383},"\u002Fglossary\u002Fpreheater-tower","cement preheaters",[62,386,387],{"href":251},"recovery boilers",". Different industries use different specific names for the resulting deposits — ",[62,390,392],{"href":391},"\u002Fglossary\u002Fslagging","slagging",[62,394,396],{"href":395},"\u002Fglossary\u002Fscaling","scaling",[62,398,400],{"href":399},"\u002Fglossary\u002Fcoking","coking",[62,402,404],{"href":403},"\u002Fglossary\u002Fbridging","bridging",[62,406,408],{"href":407},"\u002Fglossary\u002Fbuild-up-coating-accretion","coating",[62,410,411],{"href":407},"build-up"," — but fouling is the umbrella that connects them.",[68,414,416],{"id":415},"consequences-of-fouling","Consequences of fouling",[164,418,419,425,431,437,443,449],{},[167,420,421,424],{},[58,422,423],{},"Heat-transfer loss"," — reducing thermal efficiency and raising fuel cost",[167,426,427,430],{},[58,428,429],{},"Pressure-drop rise"," — derating fans and raising power consumption",[167,432,433,436],{},[58,434,435],{},"Flow blockage"," — interrupting material flow in storage and process vessels",[167,438,439,442],{},[58,440,441],{},"Tube corrosion"," — beneath the deposit, accelerated by local chemistry",[167,444,445,448],{},[58,446,447],{},"Forced outages"," — when fouling becomes severe enough to force a shutdown",[167,450,451,454],{},[58,452,453],{},"Emission excursions"," — when air-pollution-control equipment loses effectiveness",[68,456,458],{"id":457},"mitigation-philosophy","Mitigation philosophy",[55,460,461,462,465,466,468],{},"The Sylio philosophy is ",[139,463,464],{},"prevention over remediation",". Continuous low-amplitude ",[62,467,204],{"href":156}," cleaning keeps deposits from consolidating into the bonded layers that demand intensive periodic cleaning. The economic case is clear: every avoided forced outage typically justifies the entire acoustic-cleaning installation.",[68,470,162],{"id":161},[164,472,473,478,483,488,494,498],{},[167,474,475],{},[62,476,477],{"href":391},"Slagging",[167,479,480],{},[62,481,482],{"href":395},"Scaling",[167,484,485],{},[62,486,487],{"href":399},"Coking",[167,489,490],{},[62,491,493],{"href":492},"\u002Fglossary\u002Fsintering-deposit","Sintering (deposit)",[167,495,496],{},[62,497,47],{"href":200},[167,499,500],{},[62,501,187],{"href":156},{"title":189,"searchDepth":190,"depth":190,"links":503},[504,505,506],{"id":415,"depth":190,"text":416},{"id":457,"depth":190,"text":458},{"id":161,"depth":190,"text":162},"Fouling is the accumulation of unwanted deposits on the surfaces of process equipment. It is the universal phenomenon that connects every application Sylio addresses: boilers, ESPs, baghouses, SCR catalysts, hoppers and silos, HRSGs, cement preheaters, recovery boilers. Different industries use different specific names for the resulting deposits — slagging, scaling, coking, bridging, coating, build-up — but fouling is the umbrella that connects them.",{},[392,396,400,510,338,204],"sintering-deposit",{"title":512,"description":513},"Fouling — accumulation of unwanted deposits on process equipment surfaces","Fouling is the accumulation of unwanted deposits on process-equipment surfaces. The general umbrella term covering slagging, scaling, coking, sintering and many other specific mechanisms.",[515],{"title":210,"url":211},"glossary\u002Ffouling","Fouling (general)","vsFkT5ifjz3ggye30lYBeL42wZVcgPLYcyF9bwo9YnA",{"id":520,"title":182,"aliases":521,"body":525,"category":625,"description":626,"extension":197,"meta":627,"navigation":199,"path":145,"relatedTerms":628,"seo":631,"sources":634,"stem":638,"term":182,"__hash__":639},"glossary\u002Fglossary\u002Fheat-rate.md",[522,523,524],"boiler heat rate","plant heat rate","heat-rate degradation",{"type":52,"value":526,"toc":620},[527,532,536,539,579,586,590,593,595],[55,528,529,531],{},[58,530,182],{}," is the fuel energy consumed per unit of electrical energy generated, measured in BTU\u002FkWh (US) or kJ\u002FkWh (everywhere else). Lower heat rate equals higher thermodynamic efficiency. Heat rate is the central economic KPI of every coal-fired and gas-fired power plant — a 1% rise in heat rate at sustained load costs the operator 1% more fuel per MWh forever.",[68,533,535],{"id":534},"heat-rate-and-convective-pass-fouling","Heat rate and convective-pass fouling",[55,537,538],{},"Heat rate degrades from many causes. The fouling-driven contribution is normally split between:",[164,540,541,549,557,568],{},[167,542,543,548],{},[58,544,545,547],{},[62,546,314],{"href":229}," fouling"," — feedwater pre-heat falls, steam-cycle efficiency drops",[167,550,551,556],{},[58,552,553,547],{},[62,554,555],{"href":242},"Air heater"," — combustion-air pre-heat falls, boiler efficiency drops",[167,558,559,567],{},[58,560,561,563,564,547],{},[62,562,319],{"href":234}," \u002F ",[62,565,566],{"href":238},"reheater"," — outlet temperatures fall, turbine efficiency drops",[167,569,570,578],{},[58,571,572,573,577],{},"Forced ",[62,574,576],{"href":575},"\u002Fglossary\u002Fattemperator-desuperheater","attemperation"," loss"," of margin",[55,580,581,582,585],{},"A typical poorly-maintained coal-fired unit carries 2–4% heat-rate penalty from cumulative fouling. Aggressive cleaning, including ",[62,583,584],{"href":156},"sonic horns"," on convective surfaces, can recover 1–3% of that — equivalent to USD 1–5 million annual fuel saving for a 500 MW unit.",[68,587,589],{"id":588},"how-heat-rate-recovery-is-monetised","How heat-rate recovery is monetised",[55,591,592],{},"Heat-rate recovery is the headline business case for sonic-horn retrofits on coal and biomass boilers. The savings flow directly through fuel cost; payback periods of 12–24 months are routinely quoted.",[68,594,162],{"id":161},[164,596,597,602,606,610,616],{},[167,598,599],{},[62,600,601],{"href":360},"Boiler",[167,603,604],{},[62,605,314],{"href":229},[167,607,608],{},[62,609,555],{"href":242},[167,611,612],{},[62,613,615],{"href":614},"\u002Fglossary\u002Fconvective-pass-backpass","Convective pass \u002F backpass",[167,617,618],{},[62,619,187],{"href":156},{"title":189,"searchDepth":190,"depth":190,"links":621},[622,623,624],{"id":534,"depth":190,"text":535},{"id":588,"depth":190,"text":589},{"id":161,"depth":190,"text":162},"boiler","Heat rate is the fuel energy consumed per unit of electrical energy generated, measured in BTU\u002FkWh (US) or kJ\u002FkWh (everywhere else). Lower heat rate equals higher thermodynamic efficiency. Heat rate is the central economic KPI of every coal-fired and gas-fired power plant — a 1% rise in heat rate at sustained load costs the operator 1% more fuel per MWh forever.",{},[625,336,629,630,204],"air-heater","convective-pass-backpass",{"title":632,"description":633},"Heat rate — the fuel-efficiency metric used by every coal and gas plant","Heat rate is the fuel energy required to produce one unit of electrical output, measured in BTU\u002FkWh or kJ\u002FkWh. Fouling on convective surfaces directly degrades heat rate.",[635],{"title":636,"url":637},"Wikipedia — Heat rate (efficiency)","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FHeat_rate_(efficiency)","glossary\u002Fheat-rate","OgQ7351DfpLtBl2D9AWNTCFTk4exqZE2ZLpWrVGyJWA",{"id":641,"title":187,"aliases":642,"body":645,"category":840,"description":841,"extension":197,"meta":842,"navigation":199,"path":156,"relatedTerms":843,"seo":850,"sources":853,"stem":863,"term":187,"__hash__":864},"glossary\u002Fglossary\u002Fsonic-horn.md",[584,643,644],"sonic cleaning horn","industrial sonic horn",{"type":52,"value":646,"toc":833},[647,672,676,684,688,750,754,790,794,801,803],[55,648,649,650,653,654,658,659,231,661,231,664,231,666,669,670,147],{},"A ",[58,651,652],{},"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 ",[62,655,657],{"href":656},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[62,660,365],{"href":364},[62,662,369],{"href":663},"\u002Fglossary\u002Ffabric-filter",[62,665,373],{"href":372},[62,667,668],{"href":234},"boiler heat-transfer surfaces"," and ",[62,671,377],{"href":376},[68,673,675],{"id":674},"how-a-sonic-horn-works","How a sonic horn works",[55,677,678,679,683],{},"Compressed plant air admitted through a ",[62,680,682],{"href":681},"\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.",[68,685,687],{"id":686},"key-parameters","Key parameters",[76,689,690,700],{},[79,691,692],{},[82,693,694,697],{},[85,695,696],{},"Parameter",[85,698,699],{},"Typical range",[92,701,702,710,718,726,734,742],{},[82,703,704,707],{},[97,705,706],{},"Fundamental frequency",[97,708,709],{},"60–400 Hz",[82,711,712,715],{},[97,713,714],{},"Sound pressure level",[97,716,717],{},"140–180 dB",[82,719,720,723],{},[97,721,722],{},"Compressed-air consumption",[97,724,725],{},"8–14 Nm³\u002Fmin at 4–7 bar",[82,727,728,731],{},[97,729,730],{},"Operating temperature (with appropriate materials)",[97,732,733],{},"−40 °C to +500 °C",[82,735,736,739],{},[97,737,738],{},"Firing cycle",[97,740,741],{},"5–15 s burst, repeated every 3–15 minutes",[82,743,744,747],{},[97,745,746],{},"Mass",[97,748,749],{},"15–60 kg depending on horn size",[68,751,753],{"id":752},"frequency-selection","Frequency selection",[55,755,756,757,231,761,764,765,231,769,773,774,231,777,781,782,669,786,147],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[62,758,760],{"href":759},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[62,762,763],{"href":251},"recovery-boiler superheaters",", large ",[62,766,768],{"href":767},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[62,770,772],{"href":771},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[62,775,776],{"href":663},"fabric-filter compartments",[62,778,780],{"href":779},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[62,783,785],{"href":784},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[62,787,789],{"href":788},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[68,791,793],{"id":792},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[55,795,796,797,800],{},"Sonic horns are increasingly specified alongside or in place of ",[62,798,799],{"href":299},"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.",[68,802,162],{"id":161},[164,804,805,810,816,822,828],{},[167,806,807],{},[62,808,809],{"href":656},"Acoustic cleaner",[167,811,812],{},[62,813,815],{"href":814},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[167,817,818],{},[62,819,821],{"href":820},"\u002Fglossary\u002Fbell-horn","Bell horn",[167,823,824],{},[62,825,827],{"href":826},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[167,829,830],{},[62,831,832],{"href":784},"Low-frequency acoustic cleaner",{"title":189,"searchDepth":190,"depth":190,"links":834},[835,836,837,838,839],{"id":674,"depth":190,"text":675},{"id":686,"depth":190,"text":687},{"id":752,"depth":190,"text":753},{"id":792,"depth":190,"text":793},{"id":161,"depth":190,"text":162},"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.",{},[844,845,846,847,848,849],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":851,"description":852},"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.",[854,857,860],{"title":855,"url":856},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":858,"url":859},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":861,"url":862},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613738862]